Seeking help regarding the differences between motor types
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Excuse me, about electromagnetic variable-speed motors； Variable-speed motor without poles ； Variable-frequency motors: What is their principle, and what are the differences between them? Thank you.
There are two principles for adjusting the speed of electric motors. One is electrical frequency conversion speed control; the electromagnetic speed control motors and frequency conversion motors you mentioned both fall under this category. The other principle is mechanical speed control, and stepless speed change motors likely belong to this category. As someone who is not an expert in motors, my views may not be accurate; they are provided for reference only
First, understand synchronous motors and asynchronous motors, and then the rest will become clear