DC Motors (HSC SSCE Physics): Flashcards

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DC Motors
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DC motor function

Converts electrical to kinetic energy

Torque

Rotational force causing rotation

DC in DC motor

Direct Current

Force on current in B-field formula

F=IBsinθF = \ell IB\sin\theta

Torque on current loop formula

τ=IABsinθ\tau = IAB\sin\theta

Stator

Stationary part of motor

Rotor

Rotating part of motor

Commutator function

Reverses current every half rotation

Brushes in DC motor

Provide electrical contact to rotating coil

Back emf

Induced voltage opposing applied voltage

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