Q. What is the use of motor speed controller?

Answer

Here are the top uses of motor speed controller:Allow for a gradual beginning (a "soft start") rather than an abrupt one. When first connect a battery to a motor, the initial current surge can be unusually significant since a stalled motor might draw as much as 20 times its average working current.Reversing; the controller must first halt the motor in order to do this securely; reversing at full speed might be dangerous if not done properly.Safety measures against the potentially disastrous effect of connecting positive to negative.To prevent dangerous outcomes in the event of a circuit fault, the controller must implement failsafe measures.