Motors

Motors

Industry: Electrical equipment

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Motors

breakaway torque

Electrical equipment; Motors

The value of torque that is required to begin motion of an armature or rotor that is de-energized and has been at rest.

breakdown torque

Electrical equipment; Motors

The maximum torque developed by an induction motor at rated voltage and frequency without an abrupt drop in speed.

brush resistance (Rb)

Electrical equipment; Motors

Circuit resistance created by the brushes and the brush film in a brush type motor (universal, PM, wound field) adding to other power losses in a motor.

cogging

Electrical equipment; Motors

A cyclical torque variation superimposed on the D.C. motor torque caused by permeance variations as the armature teeth or rotor magnets pass stator pole tips.

commutation

Electrical equipment; Motors

In D.C. motors the switching (either mechanically or electronically) of the direction of the current in a coil or group of coils to cause a change of magnetic polarity.

In a brush type D.C. motor, the angle in electrical degrees that a coil or group of coils on an armature rotate while being commutated. In a brushless D.C. motor, the angular difference in electrical ...

dielectric strength

Electrical equipment; Motors

A high voltage test of the motor’s insulation ability to withstand an A.C. voltage. The test criterion limits the leakage current to a specified maximum at the test voltage of specified magnitude and ...