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The torque ripple caused by stator magnetic field jump of brushless DC motors was analysed theoretically and numerically, the research results show that the torque ripple caused by stator magnetic field jump is another important reason of torque ripple for brushless DC motors. A new PWM control algorithm is given to eliminate this kind torque ripple.
This paper is focused on the development of a multiphase fault tolerant BLDC machine, oriented towards the stator windings, number of phases and commutation sequences. As a first step, a six-phase BLDC machine will be modeled and simulated, using JMAG-studio software, for no-load regime. The induced emfs, cogging torque, magnetic field density map and distribution will be processed. The results of...
The predetermination of the performance of a polyphase a-c. machine is greatly facilitated by the fact that at constant voltage and frequency its magnetic field is of constant intensity and rotating with uniform velocity. It is easy to form a mental picture of lines of force moving in space and being cut by conductors, which may be moving or stationary. Furthermore, the rate of cutting, and therefore...
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