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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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DC motor speed control - anyone build one?
Hi Folks,
I know a lot of you are across a few more subjects than metalworking, so.. Looking for a practical "I can build it" speed control for a 180V DC treadmill motor I got. The original controller is stuffed, traced the fault to (surprise) the MOSFET driver cunningly encapsulated in epoxy, so no hope of seeing what it is. Plan to keep the DC supply (which is 375V DC after full wave rectification from our 240V AC mains supply.) and the existing MOSFET, back EMF diode, and what LOOKS like a zener on the gate of the MOSFET (drive limiting?) I have a vague knowledge of how the things work, but not at the voltages this will use - how do I limit input motor volts to 180v ? Ideally, would like dynamic braking, constant speed (there is an optocoupler on the back for a feedback circuit) forward/reverse etc etc...But would settle for a plain vanilla stop-slow-fast-flat out controller. Anyone got a circuit I could copy? - its no use sending me links to US suppliers, the logistics of getting it here are hopeless. Besides, I wanna build it meslef (and that should resonate with you guys) Regards, Andrew VK3BFA. |
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