To prevent damage from arcing in an electric motor, a discharge resistor is sometimes placed in parallel with the armature If the motor is suddenly unplugged while running, this resistor limits the voltage that appears across the armature coils Consider a 12 0 V DC motor with an armature that has a resistance of 7 50 Omega and an inductance of 450 mH Assume the back emf in the armature coils is 10 0 V when the motor is running at normal speed (The equivalent circuit for the armature is shown in Figure P32 73 ) Calculate the maximum resistance R that limits the voltage across the armature to 80 0 V when the motor is unplugged Armature 7 50 3 150 mH ILL 12 0 V 10 0 V

Question: To prevent damage from arcing in an electric motor, a discharge resistor is sometimes placed in parallel with the armature. If the motor is suddenly

To prevent damage from arcing in an electric motor, a discharge resistor is sometimes placed in parallel with the armature. If the motor is suddenly unplugged while running, this resistor limits the voltage that appears across the armature coils. Consider a 12.0-V DC motor with an armature that has a resistance of 7.50 Ω and an inductance of 450 mH. Assume the back emf in the armature coils is 10.0 V when the motor is running at normal speed. (The equivalent circuit for the armature is shown in Figure P32.73.) Calculate the maximum resistance R that limits the voltage across the armature to 80.0 V when the motor is unplugged.

To prevent damage from arcing in an electric

Armature 7.50 3 150 mH ILL 12.0 V 10.0 V

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