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Physics
Classical Physics
Electromagnetism
How is the energy of a zero resistance circuit converted to rotational energy?
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[QUOTE="zanick, post: 6156752, member: 174678"] This is not exactly the case on several levels. first of all, the OP is talking about a DC induction motor, which might not have a permanent magnet, and could be commutated by solid state components. (also called DC servo, AC servo, or DC brushless). you also make a few minor errors. "torque " doesn't convert the electrical energy . Yes, there is an "EMF" that apposes the positive torque , called "BEMF" but it can be varied by construction... laminate rotors vs solid rotors, change the eddy current size and effect, that can kill top speed torque/power. Not every DC motor is a generator. some do not contain magnets, some are purely induction motors. (squirrel cage rotors) Now, going back to the original question... if winding (not "rotor" as you mentioned) resistance is "0 ", ( say they were liquid nitrogen cooled or something) current would not be controlled by an applied direct DC voltage. it would be controlled by the solid state controller. the current rise would be extremely fast because of the L/R time constant, but current would be limited to the ratings of the coil winding and the other components of the motor. heat losses I^2R would be low. the power would be determined by the amper turns of the motors windings. the resistance is only a factor for the heat dissipated. there would be current induced by other elements of the motor which would generate heat, who's resistance would not be "0". this is an interesting question, but its important to understand that the windings of a motor are for carrying current and creating an electro magnetic field as well as inducing one into or onto the rotor. semiconductor based switching controllers have the ability to current limit the winding , regardless of their impedance. [/QUOTE]
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Electromagnetism
How is the energy of a zero resistance circuit converted to rotational energy?
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