Motors

Motors

Industry: Electrical equipment

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Motors

Moment of inertia

Electrical equipment; Motors

The moment of inertia is expressed as Wk2or WR2in terms of pound-feet squared. It is the product of the weight of the object in pounds and the square of the radius of gyration in feet. If the ...

Watt

Electrical equipment; Motors

The amount of power required to maintain a current of one ampere at a pressure of one volt. Most motors are rated in Kwatt equal to 1,000 watts. One horsepower is equal to 746 watts.

Type II (WPII) shall have, in addition to the enclosure defined for a Type 1 weather-protected machine, its ventilating passages at both intake and discharge so arranged that high velocity air and ...

Wound rotor induction motor

Electrical equipment; Motors

A wound rotor induction motor is an induction motor in which the secondary circuit consists of polyphase winding or coils whose terminals are either short circuited or closed through suitable ...

Wye-delta starting

Electrical equipment; Motors

A method of starting a motor at rated voltage but drawing locked rotor current and producing reduced stocked rotor torque but it provides lower starting torque than a straight delta connection. Once ...

Polarisation test

Electrical equipment; Motors

A ratio of a one-minute meggar test (see Meggar Test) to ten-minute meggar test. Used to detect contaminants in winding insulation done typically on high voltage, V.P.I. motors which are tested by ...

Poles

Electrical equipment; Motors

In an AC motor, refers to the number of magnetic poles in the stator winding. The number of poles is a determinant of the motor's speed. In a DC motor, refers to the number of magnetic poles in the ...