Servicing Of The External Drive Electric Motors
Engines used on the external drive commercial systems, as a rule, differ in size. They can be anywhere 1/12 from hp for lovers of 15 hp compressors. Air conditioning systems require engines 1 /3 HP PS 25 These engines are either 120-240 V 240 V single phase or three-phase lines. In addition to the condensing unit engines, in the systems of commercial use, engines for other purposes. Engines are used for fans, water pumps, mixers in ice cream machines.
Many communities require licensed electrical contractor, delete, restore, and install engines. The technique, however, should be able to diagnose engine trouble. Motor problems may be caused by:
- Mechanical trouble.
- Electrical trouble.
Mechanical trouble includes damaged bearings, pulleys, curvature and excessive end of the game. Electrical trouble can be further classified as internal and external. The sound of the motor can indicate disease. Under normal conditions, the motor will make a steady low rumble.
The problem exists if there are random shocks in hum or rotors chatter. In any case, the problem can be any of the following:
- The wear of bearings.
- Rubber valve.
- Dry bearings.
- The absence of voltage.
With the engine running, rotor position should be between the two extremes of the rotor end of the game. If so, this means that the rotor is trying to assume the magnetic center. Because he can't, he works inefficiently. At the end of the play should not exceed 1/16". This can be adjusted by the end of the play washers which may be obtained on the power supply of the house. Adequate lubrication of the motor bearings necessary. Usually motors should be oiled twice a year. Use electric motor oils SAE 30). Too much oil as bad as too little oil. Most motors overflow holes. These openings eliminate most of the effects of excess oil. Many lubricants are now available in aerosol cans.
The temperature of the bearing should be checked after the operation. Use a thermometer. Carefully clean the engine occasionally. Dust, dirt and grease savings should be removed from inside and outside the motor. Net switches and brush, if it is used. They should make a good contact. Brush throw-out mechanism should move freely. Brush releasing mechanisms small motors can be tested with the help of installation of V-belt on the pulley motor. And engine load, pull the strap. Chassis dynamometer, or dynamometer, is the best means of determining the real power of the engine.
There are various reasons noisy motor, including loose pulley, free fan on the pulley, or loose the flywheel. These items should be checked when noise complaints. Fan motors are usually shaded-pole type, the most common trouble bearing wear. Many of these engines are designed not need lubrication. However, in practice, many not need to lubricate. Always ensure that the motor is connected correctly. The voltage should be enough. Always test the motor for the founding and always ground the motor frame...
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Industrial