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Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
I need to control a 24v 12amp 200w motor and i know the best way is with a tl494 pwm ic so i looked for a circut and found this because it says you can only control 12v i was thinking of using higher power fets and i was wondering if i can do this and then run it off 24v and put a 12v regulator to power the ic.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
What do you mean by control? e.g. speed, power or torque e.g. potentiometer, remote voltage or digital control Is the control continuously varying (like the accelerator/throttle of a vehicle) or preset (like a pump)
The reason that I ask is to save you wasted effort.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
it is going to be used for a dc resonant charcing rotary spark gap so the speed has to be variable preferably just with a potentiometer while maintaining adaquate power and torque.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Everything you never wanted to know about PWM speed control of DC motors:
I think something like the "very simple controller" on that page would suit you well. It would work fine off 24V, if you arrange a 12V supply for the 4049 chip and the speed control pot. The TL494 circuit you originally posted would probably work all right too, although you don't actually need the two power MOSFETs! You can just connect the TL494's two output pins together and use a single FET.
For the 12V supply, something like a 7812 regulator would be nice and easy. I think the TL494 might have a regulator or zener or something built in, but can't remember off the top of my head.
However, in your place I'd be tempted just to use a bigass variable resistor, to avoid the EMC hassles. It can be a challenge to get any electronic circuit working properly in the high EMI environment of a Tesla coil spark gap. It can be like the Air Force dropping EMP bombs on you at the rate of 200 per second!
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dc motor controller
