motor control circuits
motor control circuits
(OP)
Schematic
I have a couple of motors that I'd like to put in use one for my lathe the other as a blower for my tablesaw.
The motors are brush type motors with permanent magnets operating on a voltage 130V DC drawing proximately 14 amp and rated at 2 hp.
I'm looking for motor control circuits that I can build, I'm not looking for off-the-shelf product.
I'm looking for circuits that do not have transformers.
The motor for my tablesaw, which will create a vacuum system only needs to be turned on or off
So a circuit to takes 120 V AC and converted to 130 V DC would work well in this application.
For my lathe I would need a circuit that would take 120 V AC and convert it to 130 V DC
variable 0 - 130 DC.
I have built some PWM motor controls and light controls but only in the lower voltage range of 12 to 24 volts, so building a circuit of higher voltage higher amperage is not much different but a great challenge.
I have a couple of motors that I'd like to put in use one for my lathe the other as a blower for my tablesaw.
The motors are brush type motors with permanent magnets operating on a voltage 130V DC drawing proximately 14 amp and rated at 2 hp.
I'm looking for motor control circuits that I can build, I'm not looking for off-the-shelf product.
I'm looking for circuits that do not have transformers.
The motor for my tablesaw, which will create a vacuum system only needs to be turned on or off
So a circuit to takes 120 V AC and converted to 130 V DC would work well in this application.
For my lathe I would need a circuit that would take 120 V AC and convert it to 130 V DC
variable 0 - 130 DC.
I have built some PWM motor controls and light controls but only in the lower voltage range of 12 to 24 volts, so building a circuit of higher voltage higher amperage is not much different but a great challenge.





RE: motor control circuits
A word of warning: playing about developing circuits directly connected to the utility supply can get out of hand very easily. At least consider doing the development on a lower voltage, low energy supply before going for the high power stuff.
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If we learn from our mistakes I'm getting a great education!
RE: motor control circuits
The thing that struck me as odd was that the motor was rated 130VDC, but there was no DC supply; the PWM just chopped the AC line.
With the wiring straightened out, it worked something marvelous, except for being easily stalled. The PWM unit had a tach input, but my penurious friend refused to spring for a tach, which would have made the drive rock-solid.
I think but cannot swear that the PWM drive was from Grainger, and cost less than 200 USD. Rolling your own will cost you more than that in parts.
Do buy a tach generator to go with it; you'll be glad you did.
Mike Halloran
Pembroke Pines, FL, USA
RE: motor control circuits
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for what they cost it's not worth thinking bout DIY