generator tips » Washing machine motor wired in as series motor (suicide motor)

Can you give me any help on this? I went to the dump today looking for a motor to drive a project I'm making, and I found this exact same motor. When it is driving a washing machine, it presumably has some sort of mechanism to make it run slower. Do you know how it works? Like the electronic control in a drill? Being as the motor is only rated at 370W, I would have expected that running on only part of the phase would make it incapable of turning a drum full of wet laundry! I need mine to run much slower that that!

The motor itself will run as fast as it can, given input voltage and the load you put on it. Washing machines control the speed probably through a triac and a PWM circuit. You could do that with a micro controller such as an Arduino. My Kenwood kitchen mixer (and most KitchenAid mixers) have speed control through a spinning weight that breaks contact at a certain adjustable speed. When contact breaks, the motor slows down until contact is being made again. series wound motors must always have load to run. Else the current approaches 0 so the magnetic flux approaches 0 with result the speed going to infinite. Since n = kn * (Vm - Rm * Ia) / Φ(magnetic flux). So the only damage to this Motor is from overspeeding the commutator and the friction on the brushes and/or un the bearings.

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