Bigger BLDC Motor can not start it self (must rotate manually first)

kaindub said:

In the variable speed drive world, all manufacturers just rectify the mains voltage and filter with a large bank of capacitors. As MaxHeadRoom says regulation of the power supply for a speed drive is not necessary.
Remember the controller for your BLDC gets feedback from the hall sensors (to determine speed and magnetic phase angle) and a current sensor. This is what is used to regulate the speed of the motor.
Simplest and cheapest is a transformer , diode bridge and capacitor bank. youll need to do some calculations to make sure the transformer, diode bridge and capacitors are correctly size for the load. Also include a precharge circuit before the capacitors to save your diode bridge.

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