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In order to improve the intelligent operation level of the motor operation mechanism of 126kV vacuum circuit breaker, A control method of PWM rectifier real-time adjusting drive motor speed is proposed. The equations of motion of Brushless DC motor are given, the speed response characteristic of motor is analyzed, and the controllability of motor is studied. The working principle of PWM rectifier...
Permanent Magnet Synchronous Motors (PMSMs) operating among wide speed range needs optimal flux-weakening method to reach to higher speed level. For motors whose critical point locates within the current limit circle, two different flux-weakening algorithms are discussed comparatively in this paper. One is the traditional feedback flux-weakening control strategy, the other is a revised feedback flux-weakening...
The dual three-phase permanent magnet synchronous motor (DTP PMSM) is running in asymmetrical situations with one or more of its stator phases open circuited. Moreover, the conventional coordinate transformation can not fulfill the decoupling control of DTP PMSM. To tackle these problems, we build the unified model of DTP PMSM in all kinds of open phase fault conditions in the d-q coordinate, and...
The prototype of limited angle permanent magnet motor and the performance testing are researched based on the mechanical property requirements of 40.5kV vacuum circuit breaker. The system of performance testing is accomplished according to the permanent magnet motor and circuit breaker. Sensors with high precision are selected, and the circuit and method of testing are designed. The mechanical characteristics...
The mechanical properties monitoring system of permanent magnet motor operating mechanism is developed base on the indoor 40.5kV vacuum circuit breaker in order to improve the security and reliability of power system. The high-precision linear displacement sensor is used to measure the stroke of moving contact, the angular sensor is employed to test the rotation angle of motor, and the hall current...
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