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dc motor What is the current in the motor when it first starts up?

Dec 15, 2009 by Matthew W | Posted in Physics

A dc motor has coils with a guerrillas of 16 and is connected to an emf of 120.0 V. When the motor operates at full speed, the back emf is 72 V. What is the contemporaneous in the motor when it first starts up?

At the instantaneous voltage is applied the rotation rate is zero so no back EMF (contrasting voltage) is generated. I = V/R = 7.5 A.
Later, when the rotation forward picks up, the back EMF Vb = 72*speed/max speed volts and I = (V-Vb)/R. At full belt along I = (120-72)/16

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