Thursday, April 10, 2014

Shaded Pole Induction Motor

Shaded-Pole Induction Motor
 Cutaway view of a totally enclosed fan-cooled shaded-pole induction motor
Figure 1: Cutaway view of a totally enclosed fan-cooled shaded-pole induction motor
A shaded-pole motor maybe defined as a single-phase induction motor provided with an auxiliary short-circuited winding or windings displaced in magnetic position from the main winding.

Shaded-pole induction motors are used in a wide variety of applications requiring an induction motor of 1/2 horsepower or less, even down to less than 1 mhp. It is simple in construction, low in cost, and extremely rugged and reliable - like a polyphase induction motor. Its torque characteristics and applications are similar to those of a permanent-split capacitor motor, except that it has a lower efficiency and a lower power factor. It is used in extremely wide variety of applications: home appliances, such as rotisseries, fans of all kinds such as those most commonly found in homes such as home electric fans, humidifiers, slide projectors; small business machines such as photocopy machines; vending machines, advertising displays, etc.

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Friday, February 7, 2014

Electrical Control Circuit Schematic Diagram of Two-Value Capacitor Motor

TWO-VALUE CAPACITOR MOTOR

Figure 1: An autotransformer consisting of a coil of wire wound on a laminated core. The coil is tapped at several points to obtain different voltages

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Electrical Control Circuit Schematic Diagram of Permanent Split Capacitor Motor

PERMANENT SPLIT CAPACITOR MOTOR
Figure 1: A permanent-split capacitor-run motor with the capacitor mounted on the motor

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Friday, January 31, 2014

Sunday, December 1, 2013

Standard Terminal Markings of DC (Direct Current) Motors

Standard terminal markings, as developed by NEMA, are given for series, shunt and compound motors in figure 1, figure 2 and figure 3 respectively. These figures all show compensating-field as well as commutating-field windings since they are intended to cover both fractional horsepower and integral horsepower motors. Fractional horsepower motors do not generally use compensating windings and they may not use commutating-field (interpole) windings.

The markings are combinations of letters and arabic numerals, generally, these are as follows:

- Armature - A1, A2
- Control signal lead - C
- Series field - S1, S2
- Shunt field - F1, F2

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