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The accurate initial rotor position of a permanent magnet synchronous motor (PMSM) is necessary for starting the motor, and for the position sensorless control method adopted by a PMSM control system under some working conditions. This paper presents a new method to detect the initial rotor position of a permanent magnet synchronous motor (PMSM). The method does not need a low-pass filter, and has strong robustness and a simple calculation method. According to the relationship between high-frequency current response and rotor position angle θ, the rotor position angle can be obtained by arctangent and linear formulae. Finally, the magnetic polarity of the rotor is distinguished according to the change of inductance. In this method, the arctangent function is used to eliminate the filtering process and reduce the influence of the parameter deviation of the motor system on the detection accuracy of the initial position. The experimental results verify the correctness of the theoretical analysis and the effectiveness of the method.
Zhiqiang Wang; Bo Yao; Liyan Guo; Xuefeng Jin; Xinmin Li; Huimin Wang. Initial Rotor Position Detection for Permanent Magnet Synchronous Motor Based on High-Frequency Voltage Injection without Filter. World Electric Vehicle Journal 2020, 11, 71 .
AMA StyleZhiqiang Wang, Bo Yao, Liyan Guo, Xuefeng Jin, Xinmin Li, Huimin Wang. Initial Rotor Position Detection for Permanent Magnet Synchronous Motor Based on High-Frequency Voltage Injection without Filter. World Electric Vehicle Journal. 2020; 11 (4):71.
Chicago/Turabian StyleZhiqiang Wang; Bo Yao; Liyan Guo; Xuefeng Jin; Xinmin Li; Huimin Wang. 2020. "Initial Rotor Position Detection for Permanent Magnet Synchronous Motor Based on High-Frequency Voltage Injection without Filter." World Electric Vehicle Journal 11, no. 4: 71.
This paper proposes an improved DC-link series IGBT chopping strategy for the brushless DC motor (BLDCM) drive equipped with a small DC-link capacitor fed by single-phase AC source. In this strategy, different vector sets are established according to the switching state of the DC-link IGBT and the operation mode of BLDCM. By analyzing the effect of each vector on phase current change rate, a vector selection-based current control scheme is presented. In particular, when the rectifier output voltage is less than the average line voltage of BLDCM, the combined action of vectors with only DC-link IGBT chopping is designed, in order to decrease the converter switching times and reduce the DC-link capacitance at the same time. In addition, the constraint of the DC-link capacitor voltage is analyzed to satisfy the reliable regulation of the motor phase currents, and the calculation method of the DC-link capacitance is given furthermore. The proposed strategy can achieve the smooth operation of the motor with small DC-link capacitance. Meanwhile, the total switching times of the converter are reduced, thereby improving the converter efficiency. The contrastive experimental results verify the correctness of the theories and the effectiveness of the proposed strategy.
Bining Zheng; Yanfei Cao; Xinmin Li; Tingna Shi. An Improved DC-Link Series IGBT Chopping Strategy for Brushless DC Motor Drive With Small DC-Link Capacitance. IEEE Transactions on Energy Conversion 2020, 36, 242 -252.
AMA StyleBining Zheng, Yanfei Cao, Xinmin Li, Tingna Shi. An Improved DC-Link Series IGBT Chopping Strategy for Brushless DC Motor Drive With Small DC-Link Capacitance. IEEE Transactions on Energy Conversion. 2020; 36 (1):242-252.
Chicago/Turabian StyleBining Zheng; Yanfei Cao; Xinmin Li; Tingna Shi. 2020. "An Improved DC-Link Series IGBT Chopping Strategy for Brushless DC Motor Drive With Small DC-Link Capacitance." IEEE Transactions on Energy Conversion 36, no. 1: 242-252.
The high-frequency (HF) square-wave voltage injection sensorless control method will bring additional HF torque ripple to interior permanent magnet synchronous motor (IPMSM). Focused on this problem, this paper analyzes the relationship between the HF response current and the HF torque ripple resulting from HF square-wave voltage injection. It is concluded that when the fluctuation direction of HF response current is vertical to the stator current vector direction at the maximum torque per ampere (MTPA) operating point, the resulting HF torque ripple reaches its the minimum. Based on this conclusion, a novel HF square-wave voltage injection sensorless control method is proposed in this paper, which can realize the sensorless control and minimize the HF torque ripple at the same time. The injection angle of HF square-wave voltage in the estimated synchronous rotating reference frame (SRF) is adjusted in real time according to the operating conditions, so that the HF response current always fluctuates along the vertical direction of the stator current vector at the MTPA operating point. Besides, the corresponding demodulation method of the rotor position estimation error is illustrated. Finally, the experiments are performed on a 20kW IPMSM platform and the results verify the effectiveness of the proposed method.
Zhichen Lin; Xinmin Li; Zhiqiang Wang; Tingna Shi; Changliang Xia. Minimization of Additional High-Frequency Torque Ripple for Square-Wave Voltage Injection IPMSM Sensorless Drives. IEEE Transactions on Power Electronics 2020, 35, 13345 -13355.
AMA StyleZhichen Lin, Xinmin Li, Zhiqiang Wang, Tingna Shi, Changliang Xia. Minimization of Additional High-Frequency Torque Ripple for Square-Wave Voltage Injection IPMSM Sensorless Drives. IEEE Transactions on Power Electronics. 2020; 35 (12):13345-13355.
Chicago/Turabian StyleZhichen Lin; Xinmin Li; Zhiqiang Wang; Tingna Shi; Changliang Xia. 2020. "Minimization of Additional High-Frequency Torque Ripple for Square-Wave Voltage Injection IPMSM Sensorless Drives." IEEE Transactions on Power Electronics 35, no. 12: 13345-13355.
In this study, a supercapacitor (SC)/battery hybrid energy storage unit (HESU) is designed with battery, SC and metal–oxide–semiconductor field-effect transistors. Combined with the operation of brushless DC motor (BLDCM) and the output mode of the proposed HESU, the vector combinations that are suitable for different operation states of the BLDCM are analysed. By using reasonable vector combinations, the HESU can utilise the SC to store the regenerative energy from BLDCM during the braking process and assist the battery to power the motor during the acceleration process. Also, the designed HESU can achieve high-voltage output by connecting the SC and battery in series, to suppress the commutation torque ripple of BLDCM in the motoring state. Finally, the correctness of the theoretical analysis and the feasibility of the proposed method are verified by the experiment results.
Tingna Shi; Haitian Lu; Yanfei Cao; Xinmin Li; Changliang Xia. Supercapacitor/battery hybrid energy storage unit for brushless DC motor operation. IET Electric Power Applications 2020, 14, 597 -604.
AMA StyleTingna Shi, Haitian Lu, Yanfei Cao, Xinmin Li, Changliang Xia. Supercapacitor/battery hybrid energy storage unit for brushless DC motor operation. IET Electric Power Applications. 2020; 14 (4):597-604.
Chicago/Turabian StyleTingna Shi; Haitian Lu; Yanfei Cao; Xinmin Li; Changliang Xia. 2020. "Supercapacitor/battery hybrid energy storage unit for brushless DC motor operation." IET Electric Power Applications 14, no. 4: 597-604.
Yanfei Cao; Tingna Shi; Yan Yan; Xinmin Li; Changliang Xia. Braking Torque Control Strategy for Brushless DC Motor With a Noninductive Hybrid Energy Storage Topology. IEEE Transactions on Power Electronics 2020, 35, 8417 -8428.
AMA StyleYanfei Cao, Tingna Shi, Yan Yan, Xinmin Li, Changliang Xia. Braking Torque Control Strategy for Brushless DC Motor With a Noninductive Hybrid Energy Storage Topology. IEEE Transactions on Power Electronics. 2020; 35 (8):8417-8428.
Chicago/Turabian StyleYanfei Cao; Tingna Shi; Yan Yan; Xinmin Li; Changliang Xia. 2020. "Braking Torque Control Strategy for Brushless DC Motor With a Noninductive Hybrid Energy Storage Topology." IEEE Transactions on Power Electronics 35, no. 8: 8417-8428.
The model predictive torque control (MPTC) is an effective strategy for high performance motor systems. The strategy obtains the optimal voltage vector more quickly and accurately compared with the traditional direct torque control. However, some problems of the strategy are needed to be solved, such as few active vectors, difficult cost function design, and hard duty cycle regulation and so on. An improved MPTC is put forward for these problems in this study. The number of the vector is increased by constructing virtual vectors in the improved method. The finite control set under the rotating coordinate system based on the stator flux orientation is established to select the vector and reduce the computation load. The evaluation mechanism of the selected vector is set by combined with the duty cycle method, so the weight factor of cost function in the traditional method is eliminated. And the duty cycle can play a full role in the adjustment. The prototype experiment system is built for verifying the proposed method. The results demonstrate that the proposed method has better torque and flux control performances and effectively improve the above problems in the traditional method.
Xin Gu; Pan Shen; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Tingna Shi. Improved vector selection based model predictive torque control for IPMSM. IET Electric Power Applications 2019, 14, 139 -146.
AMA StyleXin Gu, Pan Shen, Xinmin Li, Guozheng Zhang, Zhiqiang Wang, Tingna Shi. Improved vector selection based model predictive torque control for IPMSM. IET Electric Power Applications. 2019; 14 (1):139-146.
Chicago/Turabian StyleXin Gu; Pan Shen; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Tingna Shi. 2019. "Improved vector selection based model predictive torque control for IPMSM." IET Electric Power Applications 14, no. 1: 139-146.
Interior permanent magnet synchronous motors (IPMSMs) are usually used in electric vehicle drives and in other applications. In order to enlarge the speed range of IPMSMs, the flux-weakening control method is adopted. The traditional flux-weakening control strategy degrades the control performance because of parameter mismatches caused by variation of motor parameters. An improved uncertainty and disturbance estimator (UDE)-based flux-weakening control strategy is proposed for IPMSM drives in this paper. The parameter tuning method in the UDE-based control is improved. In addition, a flux-weakening adjusting factor is put forward to reduce the torque fluctuation when the operation point switches between the constant torque region and the flux-weakening region. This factor can be adjusted online by a lookup table. Finally, the validity of proposed method is verified by the simulation and experimental results. The results show that the proposed control strategy can effectively enhance the robustness of the system in the flux-weakening region, and make the system switch more smoothly between the constant torque region and the flux-weakening region.
Xin Gu; Tao Li; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Li; Gu; Wang. An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM. Energies 2019, 12, 4077 .
AMA StyleXin Gu, Tao Li, Xinmin Li, Guozheng Zhang, Zhiqiang Wang, Li, Gu, Wang. An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM. Energies. 2019; 12 (21):4077.
Chicago/Turabian StyleXin Gu; Tao Li; Xinmin Li; Guozheng Zhang; Zhiqiang Wang; Li; Gu; Wang. 2019. "An Improved UDE-Based Flux-Weakening Control Strategy for IPMSM." Energies 12, no. 21: 4077.
Different from the traditional method of the interior permanent magnet synchronous motor (IPMSM), the sensorless maximum torque per ampere (MTPA) control scheme in this paper does not need two observers for rotor position and d-q axis inductances, respectively. It only needs an adaptive sliding mode observer (ASMO) based on the extended flux (EF) to realize double-loop control and MTPA operation simultaneously. The adaptive mechanism of rotor speed is designed to ensure stability of the ASMO. The rotor position and the difference between d-axis and q-axis inductances are obtained from the estimated EF to acquire the MTPA points when the position sensor of the IPMSM is absent. The proposed scheme is realized on a 20kW IPMSM where the sensorless control performance and the MTPA control performance are tested. The effectiveness of the proposed method is verified by the experiment results.
Mengting Ye; Tingna Shi; Huimin Wang; Xinmin Li; Changliang Xia. Sensorless-MTPA Control of Permanent Magnet Synchronous Motor Based on an Adaptive Sliding Mode Observer. Energies 2019, 12, 3773 .
AMA StyleMengting Ye, Tingna Shi, Huimin Wang, Xinmin Li, Changliang Xia. Sensorless-MTPA Control of Permanent Magnet Synchronous Motor Based on an Adaptive Sliding Mode Observer. Energies. 2019; 12 (19):3773.
Chicago/Turabian StyleMengting Ye; Tingna Shi; Huimin Wang; Xinmin Li; Changliang Xia. 2019. "Sensorless-MTPA Control of Permanent Magnet Synchronous Motor Based on an Adaptive Sliding Mode Observer." Energies 12, no. 19: 3773.
In applications where motor inversion is forbidden, it is important to detect the initial rotor position of the motor. For this reason, based on coupling injection of high-frequency signal, a novel method of initial rotor position detection for brushless DC motors (BLDCM) is proposed in this paper. Firstly, the proposed method detects the relationship between three-phase winding inductances by injecting the highfrequency detection signal into motor windings in a coupling way, and the initial rotor position is determined into two sectors with 180 degrees electric angle difference. Then, the polarity of the permanent magnet rotor is determined by applying two opposite voltage vectors to motor windings, so that the initial rotor position is determined into a unique sector, and the positioning accuracy is 30 degrees electric angle. The proposed method significantly reduces the amplitude of the detection signal while increases its frequency by the way of coupling injection, thus reducing the response current and electromagnetic torque generated by the high-frequency signal and reducing the possibility of rotor inversion. Finally, the effectiveness of the proposed method is verified by experimental results.
Wei Chen; Shuhai Dong; Xinmin Li; Yanfei Cao; Guozheng Zhang. Initial Rotor Position Detection for Brushless DC Motors Based on Coupling Injection of High-Frequency Signal. IEEE Access 2019, 7, 133433 -133441.
AMA StyleWei Chen, Shuhai Dong, Xinmin Li, Yanfei Cao, Guozheng Zhang. Initial Rotor Position Detection for Brushless DC Motors Based on Coupling Injection of High-Frequency Signal. IEEE Access. 2019; 7 (99):133433-133441.
Chicago/Turabian StyleWei Chen; Shuhai Dong; Xinmin Li; Yanfei Cao; Guozheng Zhang. 2019. "Initial Rotor Position Detection for Brushless DC Motors Based on Coupling Injection of High-Frequency Signal." IEEE Access 7, no. 99: 133433-133441.
This paper presents a sector subdivision based space vector pulse width modulation (SVPWM) strategy with reduced current ripple for a three-level inverter. Using the output current ripple theory, closed-form expressions of average current ripple vectors for both continuous and discontinuous switching sequences are derived. Based on the sector and triangle distributions of conventional SVPWM strategy, each triangle is further divided into three small-regions. Then the switching sequence with the lowest magnitude of the average current ripple vector is applied in every small-region, so that the advantages of continuous pulse width modulation (CPWM) and discontinuous pulse width modulation (DPWM) under different modulation index conditions are combined to reduce the current ripple in the whole modulation range. The output performance of the proposed strategy is compared with the conventional CPWM and DPWM strategy, and experimental results verify that the proposed strategy could reduce the current ripple of three-level inverters effectively.
Guozheng Zhang; Bingxu Wei; Xin Gu; Xinmin Li; Zhanqing Zhou; Wei Chen. Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction. Energies 2019, 12, 2734 .
AMA StyleGuozheng Zhang, Bingxu Wei, Xin Gu, Xinmin Li, Zhanqing Zhou, Wei Chen. Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction. Energies. 2019; 12 (14):2734.
Chicago/Turabian StyleGuozheng Zhang; Bingxu Wei; Xin Gu; Xinmin Li; Zhanqing Zhou; Wei Chen. 2019. "Sector Subdivision Based SVPWM Strategy of Neutral-Point-Clamped Three-Level Inverter for Current Ripple Reduction." Energies 12, no. 14: 2734.
In conventional model predictive control, the dimensions of the control variables are different from each other, which makes adjusting the weighted factors in the cost function complicated. This issue can be solved by adopting the model predictive flux control. However, the performance of the electromagnetic torque is affected by the change of the cost function. A novel model predictive torque control of the interior permanent magnet synchronous motor is presented in this paper, and the cost function involving the excitation torque and reluctance torque is established. Combined with the model predictive flux control and discrete space vector modulation, the current ripple and torque ripple are reduced. The performance of torque under an overload condition is superior to model predictive flux control. The effectiveness of the proposed algorithm is verified by the simulation and experimental results.
Guozheng Zhang; Chen Chen; Xin Gu; Zhiqiang Wang; Xinmin Li. An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor. Electronics 2019, 8, 769 .
AMA StyleGuozheng Zhang, Chen Chen, Xin Gu, Zhiqiang Wang, Xinmin Li. An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor. Electronics. 2019; 8 (7):769.
Chicago/Turabian StyleGuozheng Zhang; Chen Chen; Xin Gu; Zhiqiang Wang; Xinmin Li. 2019. "An Improved Model Predictive Torque Control for a Two-Level Inverter Fed Interior Permanent Magnet Synchronous Motor." Electronics 8, no. 7: 769.
This paper presents a commutation torque ripple suppression strategy for brushless DC motor (BLDCM) in the high-speed region, which considers the back electromotive force (back-EMF) variation during the commutation process. In the paper, the influence of actual back-EMF variation on the torque and outgoing phase current during the commutation process is analyzed. A modified smooth torque mechanism is then reconstructed considering the back-EMF variation, based on which a novel torque ripple suppression strategy is further designed. Compared with the traditional strategy which controls the chopping duty cycle relatively smoothly in the commutation process, the proposed strategy dynamically regulates the chopping duty cycle, which makes it show a gradual decrease. This strategy can suppress the commutation torque ripple even in a long commutation process, and broaden the speed range of the commutation torque ripple reduction. Under the experimental conditions of this paper, the proposed strategy can effectively reduce the commutation torque ripple in the high-speed region, and avoid the outgoing phase current cannot be reduced to zero. The experimental results verify the correctness of the theoretical analysis and the feasibility of the proposed strategy.
Xinmin Li; Guokai Jiang; Wei Chen; Tingna Shi; Guozheng Zhang; Qiang Geng. Commutation Torque Ripple Suppression Strategy of Brushless DC Motor Considering Back Electromotive Force Variation. Energies 2019, 12, 1932 .
AMA StyleXinmin Li, Guokai Jiang, Wei Chen, Tingna Shi, Guozheng Zhang, Qiang Geng. Commutation Torque Ripple Suppression Strategy of Brushless DC Motor Considering Back Electromotive Force Variation. Energies. 2019; 12 (10):1932.
Chicago/Turabian StyleXinmin Li; Guokai Jiang; Wei Chen; Tingna Shi; Guozheng Zhang; Qiang Geng. 2019. "Commutation Torque Ripple Suppression Strategy of Brushless DC Motor Considering Back Electromotive Force Variation." Energies 12, no. 10: 1932.
The fast and stable current inner loop in the permanent magnet synchronous motor(PMSM) control system is the key factor that ensure the torque control performance of the motor. The deadbeat model predictive control strategy can achieve fast dynamic response, but it depended on the accurate mathematical model of the motor. When the model parameter in predictive controller has mismatched with real system, the static error or oscillations will occur in the steady state. Therefore, a novel current predictive control based on fuzzy algorithm is proposed in this paper. The novel control strategy contained a predictive controller, a proportional integral compensation link, a magnetic flux observer and a fuzzy controller. According to the operation state of the motor and the model parameter mismatch of the controller, the fuzzy algorithm can adjust the effect of compensation link by weight coefficient in real time. The dynamic performance of the proposed method is guaranteed compared with the traditional deadbeat predictive current control based on SVPWM. When the model parameter mismatch of controller is occurred, the weight of the proportional integral compensation link is enhanced, and the static error or oscillation of the motor system can be eliminated.
Zhiqiang Wang; Anbo Yu; Xinmin Li; Guozheng Zhang; Changliang Xia. A Novel Current Predictive Control Based on Fuzzy Algorithm for PMSM. IEEE Journal of Emerging and Selected Topics in Power Electronics 2019, 7, 990 -1001.
AMA StyleZhiqiang Wang, Anbo Yu, Xinmin Li, Guozheng Zhang, Changliang Xia. A Novel Current Predictive Control Based on Fuzzy Algorithm for PMSM. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2019; 7 (2):990-1001.
Chicago/Turabian StyleZhiqiang Wang; Anbo Yu; Xinmin Li; Guozheng Zhang; Changliang Xia. 2019. "A Novel Current Predictive Control Based on Fuzzy Algorithm for PMSM." IEEE Journal of Emerging and Selected Topics in Power Electronics 7, no. 2: 990-1001.
In this study, a finite set model predictive control method is proposed for the quasi-Z source inverter-permanent magnet synchronous motor drive system. In the proposed method, the control variables of quasi-Z source network and motor are controlled uniformly, which can avoid the conflicts between the shoot-through duty cycle and the inverter modulation coefficient during the dynamic adjustment process in traditional two-stage control method. Due to the particularity of the motor connected to the quasi-Z source inverter, a power compensation control method is used to obtain the inductor current reference value. Whether the shoot-through vector is chosen as the optimal vector is determined by the inductor current, and the influence of undershoot phenomenon of capacitor voltage, which results from the non-minimum phase characteristics of quasi-Z source inverter, is avoided. Steady-state, dynamic, and input voltage dip experiments are performed on a quasi-Z source inverter-permanent magnet synchronous motor drive system. The experimental results verify the feasibility of the proposed predictive control method. Besides, compared with traditional two-stage control method, the proposed method has quicker response speed and stronger anti-disturbance ability.
Kangda Dong; Tingna Shi; Shuxin Xiao; Xinmin Li; Changliang Xia. Finite set model predictive control method for quasi‐Z source inverter‐permanent magnet synchronous motor drive system. IET Electric Power Applications 2019, 13, 302 -309.
AMA StyleKangda Dong, Tingna Shi, Shuxin Xiao, Xinmin Li, Changliang Xia. Finite set model predictive control method for quasi‐Z source inverter‐permanent magnet synchronous motor drive system. IET Electric Power Applications. 2019; 13 (3):302-309.
Chicago/Turabian StyleKangda Dong; Tingna Shi; Shuxin Xiao; Xinmin Li; Changliang Xia. 2019. "Finite set model predictive control method for quasi‐Z source inverter‐permanent magnet synchronous motor drive system." IET Electric Power Applications 13, no. 3: 302-309.
This paper proposes a new single current sensor (SCS) control method for a permanent magnet synchronous motor (PMSM) driven by a quasi-Z-source inverter (qZSI). In this method, the sum of two selected branch currents in the inverter is sampled by a single current sensor twice in one control period, under actions of two different shoot-through voltage vectors. Then the three phase currents of the motor can be reconstructed by these two sample values and can be later used for current closed-loop control of the PMSM. In this paper, the feasibility of the SCS control method is analyzed thoroughly and a corresponding modulation strategy is given for the qZSI. Compared with traditional SCS control methods, the new method fully eliminates the measurement dead-zone problem without any additional compensation strategy. The operation range of the PMSM extends and utilization rate of the input voltage improves. In conclusion, the proposed method is easy and convenient to implement, which makes itself a promising application in Electrical Vehicles (EVs).
Shuxin Xiao; Tingna Shi; Xinmin Li; Zhiqiang Wang; Changliang Xia. Single-Current-Sensor Control for PMSM Driven by Quasi-Z-Source Inverter. IEEE Transactions on Power Electronics 2018, 34, 7013 -7024.
AMA StyleShuxin Xiao, Tingna Shi, Xinmin Li, Zhiqiang Wang, Changliang Xia. Single-Current-Sensor Control for PMSM Driven by Quasi-Z-Source Inverter. IEEE Transactions on Power Electronics. 2018; 34 (7):7013-7024.
Chicago/Turabian StyleShuxin Xiao; Tingna Shi; Xinmin Li; Zhiqiang Wang; Changliang Xia. 2018. "Single-Current-Sensor Control for PMSM Driven by Quasi-Z-Source Inverter." IEEE Transactions on Power Electronics 34, no. 7: 7013-7024.
Based on diode-assisted buck-boost inverter, this paper proposes a new commutation torque ripple suppression strategy for brushless dc motor (BLDCM). Four types of switching vectors are constructed, according to the working pattern of the diode-assisted inverter and the operation mode of the BLDCM. Moreover, the effects of switching vector combination on commutation torque ripple suppression and motor speed regulation are analyzed in the commutation and normal conduction periods, respectively. Based on this analysis, the duration of switching vectors within each modulation cycle is derived and the sequence of vectors is arranged at the same time in these two periods. The proposed method can effectively suppress the commutation torque ripple over the full speed range by unified switching vectors during the commutation period, without needing to switch control strategies according to the speed range. In addition, the increase of the voltage stress of switching devices in the inverter bridge can be avoided by designing the duration and sequence of switching vectors during the commutation and normal conduction periods. The effectiveness of the presented method is validated by the experimental results.
Yanfei Cao; Tingna Shi; Xinmin Li; Wei Chen; Changliang Xia. A Commutation Torque Ripple Suppression Strategy for Brushless DC Motor Based on Diode-Assisted Buck–Boost Inverter. IEEE Transactions on Power Electronics 2018, 34, 5594 -5605.
AMA StyleYanfei Cao, Tingna Shi, Xinmin Li, Wei Chen, Changliang Xia. A Commutation Torque Ripple Suppression Strategy for Brushless DC Motor Based on Diode-Assisted Buck–Boost Inverter. IEEE Transactions on Power Electronics. 2018; 34 (6):5594-5605.
Chicago/Turabian StyleYanfei Cao; Tingna Shi; Xinmin Li; Wei Chen; Changliang Xia. 2018. "A Commutation Torque Ripple Suppression Strategy for Brushless DC Motor Based on Diode-Assisted Buck–Boost Inverter." IEEE Transactions on Power Electronics 34, no. 6: 5594-5605.
A novel sensorless control strategy for the brushless DC motor (BLDCM) is proposed in this paper. The proposed strategy is realized by employing new flux-linkage functions, and can be applied to drive the sensorless BLDCM in the high speed and low speed ranges with highly accurate and reliable commutation. Another attractive feature is that the jumping edges of the flux-linkage functions are utilized to determine the commutation points, so there is no threshold needed as comparing with other sensorless control methods. In addition, the three-phase current control method is adopted, and terminal voltages in flux-linkage function expressions can be easily obtained by calculation. By this way, the sample delay and the influence of the floating phase voltage can be eliminated which can improve the accuracy and reliability of the sensorless control strategy. The effectiveness of the proposed strategy is verified by experimental results.
Wei Chen; Zhibo Liu; Yanfei Cao; Xinmin Li; Tingna Shi; Changliang Xia. A Position Sensorless Control Strategy for the BLDCM Based on a Flux-Linkage Function. IEEE Transactions on Industrial Electronics 2018, 66, 2570 -2579.
AMA StyleWei Chen, Zhibo Liu, Yanfei Cao, Xinmin Li, Tingna Shi, Changliang Xia. A Position Sensorless Control Strategy for the BLDCM Based on a Flux-Linkage Function. IEEE Transactions on Industrial Electronics. 2018; 66 (4):2570-2579.
Chicago/Turabian StyleWei Chen; Zhibo Liu; Yanfei Cao; Xinmin Li; Tingna Shi; Changliang Xia. 2018. "A Position Sensorless Control Strategy for the BLDCM Based on a Flux-Linkage Function." IEEE Transactions on Industrial Electronics 66, no. 4: 2570-2579.
In braking operation, when the unipolar modulation pattern is adopted by brushless DC motor (BLDCM), there exists not only the commutation torque ripple, but also a problem concerning controllability of braking torque. This paper conducts a research into eight unipolar modulation patterns and proposes a smooth braking torque control strategy for BLDCM. First, the controllability principle of braking torque is theoretically analyzed under different modulation patterns. Then, this paper derives and compares the speed ranges of each pattern where the braking torque is controllable and the commutation torque ripple can be reduced. On this basis, according to the torque control performance of each modulation pattern in different speed ranges, an optimized combination modulation method is developed in full speed range. The proposed control strategy ensures that the braking torque is controllable and meanwhile the commutation torque ripple can be reduced effectively, thus obtaining good braking torque control performance. The effectiveness of the proposed strategy is verified by experimental results.
Yanfei Cao; Tingna Shi; Xingzhuo Niu; Xinmin Li; Changliang Xia. A Smooth Torque Control Strategy for Brushless DC Motor in Braking Operation. IEEE Transactions on Energy Conversion 2018, 33, 1443 -1452.
AMA StyleYanfei Cao, Tingna Shi, Xingzhuo Niu, Xinmin Li, Changliang Xia. A Smooth Torque Control Strategy for Brushless DC Motor in Braking Operation. IEEE Transactions on Energy Conversion. 2018; 33 (3):1443-1452.
Chicago/Turabian StyleYanfei Cao; Tingna Shi; Xingzhuo Niu; Xinmin Li; Changliang Xia. 2018. "A Smooth Torque Control Strategy for Brushless DC Motor in Braking Operation." IEEE Transactions on Energy Conversion 33, no. 3: 1443-1452.
This study proposed a direct self-control (DSC) strategy with reduced torque ripple for brushless DC motor (BLDCM). Taking the inherent advantage of DSC, sensorless control can be easily achieved from the relationship between commutation points of BLDCM and the hexagon-shape flux linkage locus. Furthermore, in the premise that position sensor is absent, excellent steady-state torque performance can also be achieved by the proposed strategy, which is achieved by increasing the degrees of control freedom through translation of switching point. In addition, another attractive feature lies in its relatively simpler control structure. Detailed analysis of torque ripple is carried out by deriving the expressions of torque variation rate through solving differential equations. Durations of voltage vectors are calculated to ensure the minimisation of torque ripple. The superiority of the proposed method is confirmed by comparative experiments.
Changliang Xia; He Chen; Xinmin Li; Tingna Shi. Direct self‐control strategy for brushless DC motor with reduced torque ripple. IET Electric Power Applications 2018, 12, 398 -404.
AMA StyleChangliang Xia, He Chen, Xinmin Li, Tingna Shi. Direct self‐control strategy for brushless DC motor with reduced torque ripple. IET Electric Power Applications. 2018; 12 (3):398-404.
Chicago/Turabian StyleChangliang Xia; He Chen; Xinmin Li; Tingna Shi. 2018. "Direct self‐control strategy for brushless DC motor with reduced torque ripple." IET Electric Power Applications 12, no. 3: 398-404.
This paper firstly presents a novel boost front end simply with a diode, a MOSFET and a DC-link capacitor. Without extra inductors or other power components, the boost font end could boost the capacitor voltage with the motor stator inductances, thus reducing the influence of the limited DC-link voltage on commutation torque ripple reduction to a large extent. A unified commutation torque ripple suppression strategy is further proposed with the front end adopted based on the analysis about the effects of four switching vectors on motor speed regulation and DC-link capacitor voltage regulation. The proposed strategy can boost the DC-link capacitor voltage via properly selection of switching vectors under the premise of guaranteeing normal speed regulation in non-commutation period, and reduce both the commutation torque ripple and commutation time by two consistent switching vectors with the boosted DC-link capacitor voltage in commutation period. Finally, the proposed method is theoretically analyzed with respect to the capacitance selection and the boot capacity of NIBFE. The correctness of the analysis and the effectiveness of the presented method are validated by the experimental results.
Guokai Jiang; Changliang Xia; Wei Chen; Tingna Shi; Xinmin Li; Yanfei Cao. Commutation Torque Ripple Suppression Strategy for Brushless DC Motors With a Novel Noninductive Boost Front End. IEEE Transactions on Power Electronics 2017, 33, 4274 -4284.
AMA StyleGuokai Jiang, Changliang Xia, Wei Chen, Tingna Shi, Xinmin Li, Yanfei Cao. Commutation Torque Ripple Suppression Strategy for Brushless DC Motors With a Novel Noninductive Boost Front End. IEEE Transactions on Power Electronics. 2017; 33 (5):4274-4284.
Chicago/Turabian StyleGuokai Jiang; Changliang Xia; Wei Chen; Tingna Shi; Xinmin Li; Yanfei Cao. 2017. "Commutation Torque Ripple Suppression Strategy for Brushless DC Motors With a Novel Noninductive Boost Front End." IEEE Transactions on Power Electronics 33, no. 5: 4274-4284.