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Subject: motor control

Date: 11/22/99
Posted by: Örjan Olofsson
E-mail: keaton(at)ludd(dot)luth(dot)se(no spam)
URL: http://

Message:

I have model locos with 16V AC-series motors (ie AC-commutating /universial motors) and I need a circuit to improve slow speed performance without pulsing (PWM or tyristor) I have played with a circuit that controls back-emf, and that should work fine with DC permanent motors, where emf=rpm, but in my case we have emf=rpm*current ... When balancing current to keep back-emf constant, the current isn't constant and so the rpm isn't constant (at low speeds) Ideas and drawings are welcome :)

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