The paper presents performance analysis of a permanent magnet synchronous motor (PMSM) drive with torque and speed control. The PMSM motor requires sinusoidal stator currents to produce constant torque. The paper presents constituents for the mathematical analysis of the motor operation within the dq-axis model. The mathematical model serves as inspiration for development of a drive design based on the DSP processor and IGBT power module. The measurement system consists of a control unit equipped with an inverter and an encoder, the PMSM drive (500W; 5Nm; 800 rpm), a torque measuring device and a motor that work in the generator mode. The performance analysis has been performed in two control intervals. It is possible to operate the PMSM with the speed that exceeds the rated rpm if the permanent-magnet excitation is weakened by a demagnetising field component produced by the stator winding. However, it leads to a decrease of the motor efficiency. The conducted experiments have shown, that in the second control interval it is possible to increase the motor speed by about 30% as compared to the nominal rpm (overspeed).

Synthesis method of high speed finite state machines: The paper is concerned with the problem of state assignment and logic optimization of high speed finite state machines. The method is designed for PAL-based CPLDs implementations. Determining the number of logic levels of the transition function before the state encoding process, and keeping the constraints during the process is the main problem at hand. A number of coding bits, as well as codes for the states, are adjusted to achieve a machine with a determined number of logic levels. Elements of two-level minimization are taken into consideration in the state assignment. The proposed optimization method is based on utilizing tri-state buffers, thus enabling achievement of a one-logic-level output block.

This paper presents main problems of practical implementation of filed oriented control (FOC) dedicated for a permanent magnet synchronous motor (PMSM). By means of this work, elements of FOC’s mathematical model and practical implementation of the electronic commutator are presented. It is based on the DSP processing unit IGBT power module. The measurement system consists of control unit equipped with inverter and encoder. The main element of driving system is PMSM drive. There are two main problems addressed in this paper: electromagnetic distortions and proper calculations in real systems. This work is intended to resolve these problems. Described solutions have been implemented and examined practically. DOI: http://dx.doi.org/10.5755/j01.eee.20.5.7099