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Forums
Engineering
Electrical Engineering
How to calculate the counter-electromotive force of a motor?
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[QUOTE="cabrera, post: 6046498, member: 445200"] Dear Forum, I would like to get familiar with motors. I "think" I understand the basic principles of DC motor: 1) Fix magnetic field (stator), Bf 2) Rotating magnetic field( rotor), Br 3) Force (Torque) proportional to intensities of Bf, Br, angle 4) Commutation of loops to keep Br at constant angles with respect to Br, hence constant torque. 5) Counter electro-motive force, CEMF, generated by the speed ( I know "lenz's law) of the motor. I am trying to understand this point better . (Please, correct the list above if either there is anything wrong or I have omitted something)I am having a few questions: A) In a motor, how is the CEMF calculated and, hence, how is the Kv obtained? B) I am having problems visualising what happens to the coils of the rotor when they are switched off/on (commutation) ? I a normal circuit current is rectified (forced to follow a different path), but in a DC motor the coils with current are disconnected and a new coils is connected. My guess is that the field generated, "Br" is kept by current "jumping" to the new coil connected to the power source (external voltage source). B.1) What would happen to the EMF if the rotors have coils with different turns...and the torque? [/QUOTE]
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How to calculate the counter-electromotive force of a motor?
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