AC Motors(en)(92s)

February 11, 2017 | Nonfiction 1 | By admin | 0 Comments

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Extra resources for AC Motors(en)(92s)

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This can mean a significant savings in energy cost. Lower operating temperature, longer life, and lower noise levels are typical benefits of high efficiency motors. 45 NEMA Motor Characteristics Standard motor designs Motors are designed with certain speed-torque characteristics to match speed-torque requirements of various loads. The four standard NEMA designs are NEMA A, NEMA B, NEMA C, and NEMA D. NEMA A is not used very often. NEMA B is most commonly used. NEMA C and NEMA D are used for specialized applications.

Class A is seldom used. Before a motor is started, its windings are at the temperature of the surrounding air. This is known as ambient temperature. NEMA has standardized on an ambient temperature of 40° C, or 104° F within a defined altitude range for all motor classes. Temperature will rise in the motor as soon as it is started. Each insulation class has a specified allowable temperature rise. The combination of ambient temperature and allowed temperature rise equals the maximum winding temperature in a motor.

Motor manufacturers will generally classify certain recommended motor selections based on experience, required speed range, type of load torque, and temperature limits. Distance between drive and motor Distance from the drive to the motor must also be taken into Consideration. All motor cables have line-to-line and line-toground capacitance. The longer the cable, the greater the capacitance. Some types of cables, such as shielded cable or cables in metal conduit, have greater capacitance. Spikes occur on the output of AC drives because of the charging current in the cable capacitance.

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