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Kyoung-Jin Joo
Department of Electrical Engineering, Hanyang University, Seoul, South Korea

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Journal article
Published: 24 September 2018 in IEEE Transactions on Magnetics
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In this paper, the optimal design for a permanent magnet-assisted synchronous reluctance motor (PMA-SynRM) is proposed in terms of efficiency, maximum torque, and minimum torque pulsations. Design variables, objective functions, and constraints are selected for this optimal design, which is divided into two steps. Step I utilizes the pole/slot combination of the PMA-SynRM and winding methods. The chosen 4-pole/36-slot model with distributed winding maximizes the rated efficiency. In Step II, the optimal design of the stator parameters is obtained using the response surface method and the precise torque and torque ripple are calculated using the finite-element analysis (FEA). The proposed stator slot openings are minimized to minimize the air-gap flux leakage, and consequently, realize a smooth electromagnetic torque. Finally, a few FEA results are validated by experimental results.

ACS Style

Huai-Cong Liu; Kyoung-Jin Joo; Ye Jun Oh; Ho-Joon Lee; Hyun-Soo Seol; Chang-Sung Jin Jin; Won-Ho Kim; Ju Lee. Optimal Design of an Ultra-Premium-Efficiency PMA-Synchronous Reluctance Motor With the Winding Method and Stator Parameters to Reduce Flux Leakage and Minimize Torque Pulsations. IEEE Transactions on Magnetics 2018, 54, 1 -5.

AMA Style

Huai-Cong Liu, Kyoung-Jin Joo, Ye Jun Oh, Ho-Joon Lee, Hyun-Soo Seol, Chang-Sung Jin Jin, Won-Ho Kim, Ju Lee. Optimal Design of an Ultra-Premium-Efficiency PMA-Synchronous Reluctance Motor With the Winding Method and Stator Parameters to Reduce Flux Leakage and Minimize Torque Pulsations. IEEE Transactions on Magnetics. 2018; 54 (11):1-5.

Chicago/Turabian Style

Huai-Cong Liu; Kyoung-Jin Joo; Ye Jun Oh; Ho-Joon Lee; Hyun-Soo Seol; Chang-Sung Jin Jin; Won-Ho Kim; Ju Lee. 2018. "Optimal Design of an Ultra-Premium-Efficiency PMA-Synchronous Reluctance Motor With the Winding Method and Stator Parameters to Reduce Flux Leakage and Minimize Torque Pulsations." IEEE Transactions on Magnetics 54, no. 11: 1-5.

Journal article
Published: 20 June 2018 in Energies
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Since an existing 3-phase inner rotor torque actuator (TA) has severe torque ripples, it is not appropriate for a gimbal system that requires precise position control. Therefore, a coreless TA is considered to eliminate the core causing torque ripples. In order to compensate for several problems (e.g., problems of production structures and output degradation) when a coreless type is used, the final 2-phase outer rotor is proposed for the low vibration and high power TA in the gimbal system. To control the 2-phase TA applied to such the gimbal system, special inverter control methods, such as bi-directional drive for tilting control and control for output torque improvement, are required. The 2-phase 3-leg inverter is free of DC capacitor voltage unbalance compared to the 2-leg inverter, and is economical because it uses less power switches than the 4-leg inverter. Therefore, the 2-phase 3-leg inverter is applied to drive the 2-phase outer rotor coreless TA of a hybrid gimbal system, and it is verified through simulation.

ACS Style

Kyoung Jin Joo; Gang Seok Lee; Hyun Seok Hong; Sung Hong Won; Ju Lee. 3-Leg Inverter Control for 2-Phase Outer Rotor Coreless Torque Actuator in Hybrid Multi-D.O.F System. Energies 2018, 11, 1611 .

AMA Style

Kyoung Jin Joo, Gang Seok Lee, Hyun Seok Hong, Sung Hong Won, Ju Lee. 3-Leg Inverter Control for 2-Phase Outer Rotor Coreless Torque Actuator in Hybrid Multi-D.O.F System. Energies. 2018; 11 (6):1611.

Chicago/Turabian Style

Kyoung Jin Joo; Gang Seok Lee; Hyun Seok Hong; Sung Hong Won; Ju Lee. 2018. "3-Leg Inverter Control for 2-Phase Outer Rotor Coreless Torque Actuator in Hybrid Multi-D.O.F System." Energies 11, no. 6: 1611.

Journal article
Published: 02 June 2018 in Energies
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When a consumer chooses a product, one of the most important considerations is price. Therefore, cost reduction is the most important factor when manufacturing a product. This paper has applied the sensorless method to remove the position sensor in an interior permanent magnet synchronous motor (IPMSM) system and examined the way to reduce the use of the trigonometric function in order to lower the dependency on a high-end CPU. A sensorless method has been studied to use an extended electromotive force (EEMF) that can increase the degree of freedom of the motor in the IPMSM system. In addition, an observer is applied to the estimated position to stabilize the system. Furthermore, many trigonometric functions are used for driving the IPMSM. Since this trigonometric function requires decimal point operations, that requires a lot of computation time and a high-performance CPU. Therefore, this paper proposes a new method to pre-compensate the maximum torque per ampere (MTPA) angle as a way to reduce the use of the trigonometric functions which makes a high-spec CPU unnecessary. Simulations and experiments are conducted to verify the proposed control algorithm.

ACS Style

Kyoung Jin Joo; Joon Sung Park; Ju Lee. Study on Reduced Cost of Non-Salient Machine System Using MTPA Angle Pre-Compensation Method Based on EEMF Sensorless Control. Energies 2018, 11, 1425 .

AMA Style

Kyoung Jin Joo, Joon Sung Park, Ju Lee. Study on Reduced Cost of Non-Salient Machine System Using MTPA Angle Pre-Compensation Method Based on EEMF Sensorless Control. Energies. 2018; 11 (6):1425.

Chicago/Turabian Style

Kyoung Jin Joo; Joon Sung Park; Ju Lee. 2018. "Study on Reduced Cost of Non-Salient Machine System Using MTPA Angle Pre-Compensation Method Based on EEMF Sensorless Control." Energies 11, no. 6: 1425.

Journal article
Published: 28 February 2018 in Journal of the Korean Society for Railway
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Wireless trams with independently rotating wheelsets require fast and precise torque control performance. In order to achieve this, torque control using flux-based 2D-LUT is most suitable. This makes it possible to easily convert the torque command into a current vector, and it is possible to perform stable torque control even if the battery voltage fluctuates greatly, such as in a wireless tram. In this paper, flux-based 2D-LUT generation method and torque control using FEA are studied. The validity of the proposed method is verified through simulation.

ACS Style

Ye Jun Oh; Kyoung Jin Joo; Ju Lee; Hyungwoo Lee. Flux-based Torque Control Strategy using FEA in Wireless Tram with Independently Rotating Wheelsets. Journal of the Korean Society for Railway 2018, 21, 41 -46.

AMA Style

Ye Jun Oh, Kyoung Jin Joo, Ju Lee, Hyungwoo Lee. Flux-based Torque Control Strategy using FEA in Wireless Tram with Independently Rotating Wheelsets. Journal of the Korean Society for Railway. 2018; 21 (1):41-46.

Chicago/Turabian Style

Ye Jun Oh; Kyoung Jin Joo; Ju Lee; Hyungwoo Lee. 2018. "Flux-based Torque Control Strategy using FEA in Wireless Tram with Independently Rotating Wheelsets." Journal of the Korean Society for Railway 21, no. 1: 41-46.

Journal article
Published: 20 January 2017 in IEEE Transactions on Magnetics
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Recently, the permanent magnet-assisted synchronous reluctance motor (PMa-SynRM) that can replace induction motor has been more studying because of the needs of the high efficiency motor development for minimum energy performance standard (MEPS). PMa-SynRM requires the speed and position information of rotor to control motor correctly. However, sensor for rotor information has many problems such as mounting space shortage and the additional system cost. Therefore, in this paper, the speed-sensorless control based on reference model adaptive control (RMAC) is introduced to eliminate the sensor. And mechanical design is improved for control. The proposed method is verified by simulation.

ACS Style

Kyoung-Jin Joo; In-Gun Kim; Ju Lee; Sung-Chul Go. Robust Speed Sensorless Control to Estimated Error for PMa-SynRM. IEEE Transactions on Magnetics 2017, 53, 1 -4.

AMA Style

Kyoung-Jin Joo, In-Gun Kim, Ju Lee, Sung-Chul Go. Robust Speed Sensorless Control to Estimated Error for PMa-SynRM. IEEE Transactions on Magnetics. 2017; 53 (6):1-4.

Chicago/Turabian Style

Kyoung-Jin Joo; In-Gun Kim; Ju Lee; Sung-Chul Go. 2017. "Robust Speed Sensorless Control to Estimated Error for PMa-SynRM." IEEE Transactions on Magnetics 53, no. 6: 1-4.

Journal article
Published: 02 January 2017 in Journal of Electrical Engineering & Technology
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ACS Style

In-Gun Kim; Hyun-Seok Hong; Sung-Chul Go; Ye-Jun Oh; Kyoung-Jin Joo; Ju Lee. A Study on the Stable Sensorless Control of BLDC Motor Inside Auxiliary Air Compressor. Journal of Electrical Engineering & Technology 2017, 12, 466 -471.

AMA Style

In-Gun Kim, Hyun-Seok Hong, Sung-Chul Go, Ye-Jun Oh, Kyoung-Jin Joo, Ju Lee. A Study on the Stable Sensorless Control of BLDC Motor Inside Auxiliary Air Compressor. Journal of Electrical Engineering & Technology. 2017; 12 (1):466-471.

Chicago/Turabian Style

In-Gun Kim; Hyun-Seok Hong; Sung-Chul Go; Ye-Jun Oh; Kyoung-Jin Joo; Ju Lee. 2017. "A Study on the Stable Sensorless Control of BLDC Motor Inside Auxiliary Air Compressor." Journal of Electrical Engineering & Technology 12, no. 1: 466-471.

Conference paper
Published: 01 November 2016 in 2016 IEEE Conference on Electromagnetic Field Computation (CEFC)
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Recently, the permanent magnet-assisted synchronous reluctance motor (PMa-SynRM) that can replace an induction motor has been studying because of the needs of the high efficiency motor development for the minimum energy performance standard (MEPS). PMa-SynRM requires the speed and position information of the rotor to control motor correctly. However, a sensor for the rotor information has many problems such as mounting space shortage and additional system cost. Therefore, in this paper, the speed-sensorless control based on model reference adaptive system (MRAS) is introduced to eliminate the sensor. The proposed algorithm is verified by the simulation.

ACS Style

Kyoung-Jin Joo; Su Yeon Cho; Soo-Jin Jung; Ju Lee. Robust speed sensorless control to estimated error for PMa-SynRM. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) 2016, 1 -1.

AMA Style

Kyoung-Jin Joo, Su Yeon Cho, Soo-Jin Jung, Ju Lee. Robust speed sensorless control to estimated error for PMa-SynRM. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC). 2016; ():1-1.

Chicago/Turabian Style

Kyoung-Jin Joo; Su Yeon Cho; Soo-Jin Jung; Ju Lee. 2016. "Robust speed sensorless control to estimated error for PMa-SynRM." 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) , no. : 1-1.

Conference paper
Published: 01 November 2016 in 2016 IEEE Conference on Electromagnetic Field Computation (CEFC)
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This presents a methodology to determine detail design directions of an 150kW-class IPMSM and its detail design. The basic design of the stator and rotor was conducted. After dividing the designed models into the best cases and the worst cases based on rotor shape parameters, Sensitivity Analysis and 3D Voltage-Inductance Map parameters were analyzed. Then, the design direction for the final model was predicted. Based on the prediction, the final model was extracted with Trend Analysis. Lastly, the final model was validated with experiments.

ACS Style

Tae Chul Jeong; Ng Woo Kang; Geo Chul Jeong; Kyoung Jin Joo; Ju Lee. Optimal rotor design of an 150kW-class IPMSM through the 3D voltage-inductance map analysis method. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) 2016, 1 -1.

AMA Style

Tae Chul Jeong, Ng Woo Kang, Geo Chul Jeong, Kyoung Jin Joo, Ju Lee. Optimal rotor design of an 150kW-class IPMSM through the 3D voltage-inductance map analysis method. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC). 2016; ():1-1.

Chicago/Turabian Style

Tae Chul Jeong; Ng Woo Kang; Geo Chul Jeong; Kyoung Jin Joo; Ju Lee. 2016. "Optimal rotor design of an 150kW-class IPMSM through the 3D voltage-inductance map analysis method." 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) , no. : 1-1.

Conference paper
Published: 01 November 2016 in 2016 IEEE Conference on Electromagnetic Field Computation (CEFC)
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This paper suggests the design to attain the optimal efficiency of PMa-SynRM. Globally, Minimum Energy Performance Standards(MEPS) is largely implemented for reducing the consumption of energy. For satisfying MEPS which will be strengthened afterwards, ultra-premium efficiency motor which can surpass the super-premium level, should be fully researched and developed. However, SynRM is difficult to reach ultra-premium efficiency. Unlike SynRM, PMa-SynRM contains the permanent magnet, so it can reaches ultra-premium efficiency. However, to design PMa-SynRM, the fundamental design should be re-progressed through the selection of appropriate loading ratio. And it needs optimal design of rotor considering numerous variables of rotor. In this paper, the main design parameters which has a high sensitivity are selected through sensitivity analysis and the optimal design of rotor is implemented to reach the maximum efficiency. Then, the improvement of performance is confirmed by comparison to SynRM. Finally, the achievement of ultra-efficiency will be verified by experiment.

ACS Style

Dong-Hoon Jung; Geo-Chul Jeong; Kyoung-Jin Joo; Ju Lee. Study on the optimal design of PMa-SynRM loading ratio for achievement of ultra-premium efficiency. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) 2016, 1 -1.

AMA Style

Dong-Hoon Jung, Geo-Chul Jeong, Kyoung-Jin Joo, Ju Lee. Study on the optimal design of PMa-SynRM loading ratio for achievement of ultra-premium efficiency. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC). 2016; ():1-1.

Chicago/Turabian Style

Dong-Hoon Jung; Geo-Chul Jeong; Kyoung-Jin Joo; Ju Lee. 2016. "Study on the optimal design of PMa-SynRM loading ratio for achievement of ultra-premium efficiency." 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) , no. : 1-1.

Conference paper
Published: 01 November 2016 in 2016 IEEE Conference on Electromagnetic Field Computation (CEFC)
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Based on multi-objective optimization, the design method of a magnetic levitation controller for electromagnetic suspension is proposed in this paper. First, we modify the output feedback system with a reduced order observer as the static output feedback system in order to simplify the optimization problem. By solving the modified optimization problem, the state feedback control gain is obtained such that the controlled system guarantees the mixed H 2 /H ∞ norm bound of the transfer function between exogenous inputs such as noises and disturbances and controlled outputs.

ACS Style

Chang Hyun Kim; Kyoung Jin Joo; Ju Lee. Multi-objective robust controller design for electromagnetic suspensions via LMI. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) 2016, 1 -1.

AMA Style

Chang Hyun Kim, Kyoung Jin Joo, Ju Lee. Multi-objective robust controller design for electromagnetic suspensions via LMI. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC). 2016; ():1-1.

Chicago/Turabian Style

Chang Hyun Kim; Kyoung Jin Joo; Ju Lee. 2016. "Multi-objective robust controller design for electromagnetic suspensions via LMI." 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) , no. : 1-1.

Conference paper
Published: 01 November 2016 in 2016 IEEE Conference on Electromagnetic Field Computation (CEFC)
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AWD (All Wheel Drive) clutch is a system that allocates the part of entire driving force with the front wheel drive shaft, among the main power delivered to the rear wheel axle through the electric control of clutch system inside the transfer module. It controls the surface pressure using the change (forward and reverse direction) in the oil flow rate of clutch pack depending on the driving condition, and delivers the driving force of main drive shaft to the sub-drive shaft through the difference of surface pressure. An oil hydraulic motor does not need maintenance and repair, and BLDC motor sensorless has been used as it is strong against outside influences such as vibration and heat. This paper proposed the control method of instantaneous forward and reverse direction considering response and stability.

ACS Style

In-Gun Kim; Kyoung Jin Joo; Jong-Suk Lim; Ju Lee. A study on sensorless control that considers the response of BLDC motor inside the oil hydraulic actuator for AWD clutch control. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) 2016, 1 -1.

AMA Style

In-Gun Kim, Kyoung Jin Joo, Jong-Suk Lim, Ju Lee. A study on sensorless control that considers the response of BLDC motor inside the oil hydraulic actuator for AWD clutch control. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC). 2016; ():1-1.

Chicago/Turabian Style

In-Gun Kim; Kyoung Jin Joo; Jong-Suk Lim; Ju Lee. 2016. "A study on sensorless control that considers the response of BLDC motor inside the oil hydraulic actuator for AWD clutch control." 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) , no. : 1-1.

Conference paper
Published: 01 November 2016 in 2016 IEEE Conference on Electromagnetic Field Computation (CEFC)
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A fuel injector is a device which converts electric energy to linear motion energy without a separate mechanical link. Its structure is quiet simple, economical, and precise control is possible. Therefore, fuel injectors are widely used in automotive, consumer products and general industrial applications, such as switches, relays, and valves. However, there is a lack of in-depth studies devoted to fuel injector compared to its scope of use. Since general fuel injector applications are operated at high speed with vary short stroke, an in-depth study on improving the magnetic force performance is needed. This paper first presents a method of designing an equivalent magnetic circuit (EMC) for basic model which is a good compromise between simplicity and accuracy. Then due to significant leak flux and magnetic saturation in fuel injections models. We use the 2D finite-element method (2D FEM) to detail design and reduce the leakage flux from electromagnet pole to lead pipe which can improve the fuel injector performance. At last, analysis of axis asymmetry, 3D FEM, and experiments on prototype were conducted. As a result the optimal fuel injector with design sleeve in the lead pipe and cone type structures shows the substantially improved performance compared with a conventional design.

ACS Style

Huai-Cong Liu; Kyoung-Jin Joo; Ho-Joon Lee; Ju Lee. Design of equivalent magnetic circuit and parameter analysis for improving performance of fuel injections. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) 2016, 1 -1.

AMA Style

Huai-Cong Liu, Kyoung-Jin Joo, Ho-Joon Lee, Ju Lee. Design of equivalent magnetic circuit and parameter analysis for improving performance of fuel injections. 2016 IEEE Conference on Electromagnetic Field Computation (CEFC). 2016; ():1-1.

Chicago/Turabian Style

Huai-Cong Liu; Kyoung-Jin Joo; Ho-Joon Lee; Ju Lee. 2016. "Design of equivalent magnetic circuit and parameter analysis for improving performance of fuel injections." 2016 IEEE Conference on Electromagnetic Field Computation (CEFC) , no. : 1-1.