Robust Motor control power supply

[Joea]

Hi I have just joined this most interesting forum, i am not (now) an audiophile i managed to destroy my hearing back in seventy's......

i al looking for information on dc motor speed control 190VDC permanent magnet DC motor 1/2 HP from 230VAC so perhaps AC to DC full bridge then chop it up???
Any sensible suggestions or other experience out there orany good ideas!!-)

Joea

 

[MicrosiM]

it seems you need 190VDC output power supply?


If this is the case, then its possible.

Regards

 

[tonigau]

In 240V treadmills with 180V DC PM motors .
The 2 types of motor control for these I have seen are:
. 1. Phase controlled bridge 240V
. 2. 240V --> 350V DC (diode bridge & cap) & PWM to the motor.

In both the above they just limit the duty cycle so the average current to the motor is not exceeded at full speed.
The motor insulation needs to be rated for the full voltage though.
or
you could make a stepdown AC --> DC power supply & PWM.

If your load is dynamic (eg not a fan motor) you will need speed feedback else torque will be less than optimum (motor will slow down with load increase)
Back EMF is relative to motor RPM so can measure this during PWM off time for motor speed sensor.