24 Terms
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Motors
Industry: Electrical equipment
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Motors
Polyphase motor
Electrical equipment; Motors
Two or three-phase induction motors have their windings, one for each phase, evenly divided by the same number of electrical degrees. Reversal of the two-phase motor is accomplished by reversing the ...
Power code
Electrical equipment; Motors
Identifies the type of power supply providing power to a DC motor. Frequency, voltage, and type of rectifier configuration.
Power factor
Electrical equipment; Motors
A measurement of the time phase difference between the voltage and current in an AC circuit. It is represented by the cosine of the angle of this phase difference. For an angle of 0 degrees, the ...
Primary winding
Electrical equipment; Motors
That winding of a motor, transformer or other electrical device which is connected to the power source.
Protective relay
Electrical equipment; Motors
A relay, the principal function of which is to protect service from interruption, or to prevent or limit damage to apparatus.
Pull-in torque
Electrical equipment; Motors
The maximum constant torque which a synchronous motor will accelerate into synchronism at rated voltage and frequency.
Pull-up torque
Electrical equipment; Motors
The minimum torque developed by an AC motor during the period of acceleration from zero to the speed at which breakdown occurs. For motors which do not have a definite breakdown torque, the pull-up ...
