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Any references to ASM losses when using "coarse" switch pattern?

Any references to ASM losses when using "coarse" switch pattern?

Any references to ASM losses when using "coarse" switch pattern?

(OP)
Hello!

I am involved in a discussion on additional losses caused by the primitive switching patterns that were common before IGBT and MOSFET and PWM. Those switching patterns usually had only a few edges in a cycle and caused severe cogging, especially at low speeds.

The cogging (or torque ripple) is a superimposed acceleration/decelaration and therefore cause extra losses in the rotor. Not talking about eddy current in the iron, but "microstarting" currents in the rotor (and "microbraking", of course).

I have looked around to find any written references to it but my googling has not been successful so far.

Anyone knowing a good source?

Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...

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