Torque is the key: for motors in applications, the boilerplate approach to specification and design will get the system stopped because the motor won't start. Consider voltage, speed, and torque for these special instances, and follow along with the Case Of The Not-So-Centrifugal Pump Curve and the Case Of The Frequent Motor Failure to do some real-life motor-starting sleuthing.

Engineered Systems | October 1, 2005| | Copyright

When specifying electric motors for plant equipment, most designers probably give little thought to successfully starting the motor, concentrating instead on required horsepower rating, service factor, and other features of design and construction. In most cases, this is OK, and it's our track record of trouble-free projects that leads to the lack of concern.

Some applications, however, require more than just matching the starter size to the motor horsepower if successful starting is to be achieved. These include motors that are large relative to the supply system ...

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