Hey guys.
We have designed a driver for 3 phase bldc motor and we faced a problem. The BLDC motor is for a scooter and we need to limit the speed below 15km/h.When riding in a zero or positive slope we can do this by decreasing the PWM. But when riding in downhill how can we do this? Shall we turn on the low side mosfets together not to let the speed?If we do this are we going to damage the motor or the mosfets?

 

A normal way of doing this to:
Use the motor as a dynamo and charge the battery when you need more break force use an extra load.

Picbuster