synchronous machines

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DIRECT CURRENT MACHINES Induced voltage and torque calculation. • The magnetic field is generated by the field current I f . • The flux Φ f is proportional to the field current. Φ f = K f I f . • The K f factor is calculated from the magnetic circuit using Amperes Law. • The flux change is proportional to the motor speed ω m .
DIRECT CURRENT MACHINES Induced voltage and torque calculation. • The induced voltage after rectification is: E a = K Φ f ω m = K K f I f ω m = K m I f ω m • The out put power if the losses are neglected is: P dc = I a E a = T m ω m . • The torque is: T m = I a E a / ω m = K Φ f I a = K m I f I a
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