Thanks for the responses everybody.
I don't want to just slow down the motor, I want to control the speed. I have feedback through a 1024 line encoder to a PC, and the PC outputs the pwm. What I want to do , and what I'm having trouble with, is controlling the motor. I've attached a schematic of what I'm trying to do. The opto-coupler in the upper right is driven by a transister with 24 volt supply. This transister is controlled by the PC.
Yes, I said base, I meant gate. Call it a typo.
Maybe the IGBT isn't the best device for this. If the gate needs an amp to turn on, it's going to be drawing as much power as the motor. I've not been able to find anything that mentions anything about the I
GE
Maybe a Hexfet or something.
Regards,
Bill