Maker Pro
Maker Pro

Universal Motor Control



Jan 1, 1970

I have a 110v 5amp universal drill motor. I wish to design a motor
controller which will allow speed and direction control, and interface at
TTL to a PIC uC. I can run the motors in AC or DC. The motor is a series
or universal type which requires the polarity to be switched at the coils in
order to change direction. There are 4 wires going to the motor, 2 for the
stator and 2 for the rotor coils. Shorting either side of the coils will
change the motor's direction.

I have looked at solid state relays to switch coil
polarities, but it would required 6 relays for each motor. ( running on DC
and PWM the relay ) I also have looked at using igbt/mosfet combo, but I
would still need to find a way to change polarity at the coils...

Can anyone point me to any designs/schematics/appnotes available
somwhere on the web to accomplish this?