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To broaden the speed range of PMSM (Permanent Magnet Synchronous Motor) for the electric vehicles and to improve the stability in the high speed and small torque operating conditions of the electric vehicles, the control strategy based on flux-weakening control algorithm, using voltage feedback method, combined with SMVSC (Sliding Mode Variable Structure Control) algorithm, using the improved exponential...
Direct Torque Control (DTC) is a new technique to obtain the higher control features in the AC machines. The torque ripple is the inherent features since the bang-bang control method is adopted in DTC system. In order to decrease the torque ripple in permanent magnet synchronous motor (PMSM) with the large capacity, the regional interpolation algorithm of zero voltage vectors is proposed and the practical...
A field-weakening control is required in order to achieve high power output and stable control in the voltage saturation region. In this paper, a voltage phase-operated field-weakening control and a frequency-compensation control are presented. The voltage phase operation control adjusts the voltage phase command with the voltage maintained at the maximum value. Therefore the proposed control can...
Low-power PMSMS (permanent magnet synchronous motor with sinusoidal excitation) drive systems are standard equipped with PWM inverter which employ a diode rectifier front-end (has not a regenerative unit) to supply the ac power from the mains to the dc link. This paper proposes an algorithm to generate the optimum d- and q-axis reference currents for four quadrant operation of PMSMS drive system,...
The interior permanent magnet synchronous motor (IPMSM) can make use of the magnetoresistive effect to improve its efficiency and speed characteristics, so that it is suited to railway vehicle. To solve electromagnetic torque output insufficient of IPMSM using the traditional field weakening control method, the field weakening control strategy of interior permanent magnet synchronous motor for railway...
There are big ripples on current and electromagnet torque under traditional hysteresis direct torque control (HDTC) on motor drive system. To solve these problems, a two dimension cloud model controller is designed to instead traditional hysteretic comparator in this paper, and zero voltage vectors are used to further reduce ripples. The torque error, the flux error and stator flux position are used...
The continuous improvement of social practical production demands modern motor controlling technology. PMSM has been widely applied to those occasions of high performance because of its excellent performance. However, there are large flux linkage and torque ripples and inconstant switching frequency in the conventional DTC. To solve these problems, PMSM DTC using SVPWM based on the subdivision of...
The paper deals with description of two tested control algorithms for permanent magnet synchronous traction motor (PMSM), which uses DSP TI 2812. The first of the algorithm was phase current control algorithm based on sinusoidal commutation of brushless DC motors. The algorithm was improved by induced voltage compensation to reach better transient behavior in higher frequencies. The second algorithm...
In order to improve dynamic performance and reduce switching loss of permanent magnet synchronous motor system in electric vehicle drive, a self-adjusting direct torque control strategy is proposed. Based on the analyses of zero voltage vector in DTC, fuzzy control rules with zero voltage vector are presented to acquire both quick dynamic torque response of PMSM and reduced switching loss of inverter...
This contribution deals with the control of the wheel drive with permanent magnet synchronous machine of the tram car. In order to achieve minimal dimensions of PMSM and on the other hand to be able to provide sufficient torque, the drive is operating in very wide speed range in the field weakening and with the machine load angle of 90deg. Thus, the new problem introduced by this drive is requirement...
Forced dynamics control principles are exploited to develop control algorithms for electric drive with PMSM and flexible couplings. The controller is of the cascade structure, comprising an inner speed control loop, which respects the principles of vector control and requires a load torque estimate and an outer position control loop, which is designed to control the PMSM rotor or load angle in the...
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