To avoid seriously overheating the motor on startup, it is recommended that ...

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Multiple Choice

To avoid seriously overheating the motor on startup, it is recommended that ...

The main idea is that starting current is high and the motor isn’t yet delivering usable torque. If the motor has a load on it when it starts, the motor must produce torque to overcome that load right away. That extra torque requirement makes the motor draw more current during startup, causing more heat buildup and a greater chance of overheating. Starting unloaded means the motor only has to accelerate its own inertia, so the starting current is lower and heat is kept under control. Once the motor reaches running speed, you can apply the load more gradually without pushing it into that high-inrush, high-theat condition. Avoid increasing voltage or starting at full speed with a load, because both approaches raise the starting current and stress the motor, increasing the risk of overheating.

The main idea is that starting current is high and the motor isn’t yet delivering usable torque. If the motor has a load on it when it starts, the motor must produce torque to overcome that load right away. That extra torque requirement makes the motor draw more current during startup, causing more heat buildup and a greater chance of overheating.

Starting unloaded means the motor only has to accelerate its own inertia, so the starting current is lower and heat is kept under control. Once the motor reaches running speed, you can apply the load more gradually without pushing it into that high-inrush, high-theat condition.

Avoid increasing voltage or starting at full speed with a load, because both approaches raise the starting current and stress the motor, increasing the risk of overheating.

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