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Category: Electric Motors

Electric Motors

Resistance-Start Induction-Run Motor

Posted on June 5, 2019June 9, 2019 by admin

The rotating magnetic field of the resistance-start induction-run motor is produced by the out-of-phase currents in the run and start windings. Since the run winding…

Electric Motors

Identifying Motor Capacitor Terminals

Posted on May 18, 2011November 4, 2012 by admin

Most run capacitors and some starting capacitors are of the oil-filled type. This is especially true for high current motors such as those used to…

Electric Motors

Permanent Split Capacitor Motor

Posted on April 24, 2011November 4, 2012 by admin

The permanent-split capacitor motor has greatly increased in popularity for use in the air conditioning field over the past years. This type of split-phase motor…

Electric Motors

Motor Power Consumption

Posted on April 24, 2011November 4, 2012 by admin

It should be noted that the motor does not use less energy when connected to 240 volts than it does when connected to 120 volts.…

Electric Motors

Dual Voltage Motor

Posted on April 24, 2011November 4, 2012 by admin

Single-phase motors can also be constructed to operate on two separate voltages. These motors are designed to be connected to 120 or 240 volts. A…

Electric Motors

Testing The Stator Winding

Posted on April 24, 2011November 5, 2012 by admin

The stator winding of a single-phase motor is generally tested with an ohmmeter. The ohmmeter test can be used to determine if a winding is…

Electric Motors

Capacitor-Start Induction-Run Motors

Posted on April 24, 2011November 5, 2012 by admin

Capacitor-start induction-run motors are very similar to resistance-start induction-run motors. The design of the stator winding is basically the same. The main difference is that…

Electric Motors

The Effects of Voltage Variations on AC Motors

Posted on January 7, 2011November 20, 2012 by admin

Motors will run at the voltage variations already mentioned. This does not imply such operation will comply with industry standards of capacity, temperature rise, or…

Electric Motors

Potential-Type Relay

Posted on January 7, 2011November 21, 2012 by admin

This relay is generally used with large commercial and air-conditioning compressors (see Fig. 7-31). Motors may be capacitor-start, capacitor-run types up to 5 hp. Relay…

Electric Motors

Current-Type Relay

Posted on January 7, 2011November 21, 2012 by admin

The current-type relay is most often used with small refrigeration compressors up to 1 hp. Where power is applied to the compressor motor, the relay…

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