decay modes are not as simple as some literature put it. an oscilloscope is a good help when playing with them. on my previous job, I was designing DC to AC inverters and it's hard to debug hardware problems without a scope.
I am using PWM controllers (as they already have much of the needed hardware) and HIP4081 when designing my own controllers.
the supply voltage can actually go anywhere from 5x to 20x or even more. they are rough estimates on what can give you good performance on your motor. you can even use a non-regulated supply, but performance will vary depending on current consumption of the load. if you are already using the controller, try to measure (full rated current on stopped motor) the winding voltage and you will see the rated voltage of the motor.
using LC filters before the motor windings sometimes helps in reducing motor heating. they reduce HF AC current into the winding thus reducing eddy currents. |