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When the rotor of an electric motor is jammed the coils are likely to overheat and even burn Explain why this does not happen when the rotor is not jammed?
Wiki User
∙ 13y ago
Because work is being done by a rotating motor. The stalled motor still wants to work, but cannot. The incoming energy is turned to heat.
In-depth Answer:
As a motor slow down under a load its current draw increases. At stall (locked, jammed, etc) the current is maximum for the motor. At this point the motor ceases to be a motor and can be thought of as a resistor in the circuit. As the current flows through the windings they heat up and eventually the insulation fails. This, in turn, causes shorting/arcing between the coils.
Under normal operation the current is low enough not to cause this effect.
Most electric motors have a fan cooling system built into their housings to prevent overheat while running. Also, thermal cut offs are sometimes placed in the coils. These cut power if the temperature exceeds a certain limit.
Wiki User
∙ 13y ago
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