The rotor bars are made up of aluminum, brass, or copper. Magnetizing current (MAG. The higher the percentage, the more efficiently the motor converts incoming electrical power to mechanical horsepower. How to read a NEMA motor nameplate | ABB - News Copyright 2023 Thomas Publishing Company. A permanent capacitor motor A) provides improvement of motor power factor B) uses identical run and auxiliary windings C) all of these 1. To operate successfully, the motor frequency must match the power system (supply) frequency. Typical applications of synchronous induction motors include fans, pumps, blowers, generators, air-compressors, ammonia compressors, machinery and line shafting in industrial works such as cement mills, rolling mills, flour mills, paper mills, rubber works and textile mills. 29. At normal speed, however, the rotor current frequency is quite low so that the reactance of the two rotor cages are insignificant compared with the resistances, and the performance approximates to that of the low-resistance cage. Synchronous motors operate in a similar fashion to induction motors except that in the case of a synchronous motor, the stator and rotor fields are locked into alignment so that the stator RMF will cause the rotor to turn at the exact same rate of rotation (in synch therefore the slip is equal to 0). 20. If the motor is further loaded, the motor will stop. In this motor phase of the emf can be varied but not the magnitude. Reluctance motors can be driven by single-phase or polyphase. Before uploading and sharing your knowledge on this site, please read the following pages: 1. NO.) The rotors of the three phase induction motor are further classified as: Squirrel Cage Rotor. We will discuss the types of rotors used in 3-phase induction motors in the following section of types of three phase induction motors. Asynchronous (induction) motors can be further categorized into two different types based on their construction: the squirrel cage induction motor and the wound rotor induction motor. Design letters are not defined for motors larger than 500 Hp at 1800 RPM. Three-Phase AC Shunt Commutator Motor. Bearings (DE and ODE)- Information is usually given for both the drive-end (DE) bearing and the bearing opposite the drive end (ODE). The motor branch circuit conductors must have a minimum capacity of 125 percent of motor full-load current to comply with Section 430-22. Hence the synchronous induction motor is essentially a motor, having the induction motor features like high starting torque with low starting current combined with the synchronous motor features like constant speed and power factor control. This condition results in the stator producing what is known as an RMF or Rotating Magnetic Field. Company. it's sometimes possible to use full horsepower and full-service factor since ambient temperatures are usually lower at those altitudes. Image Guidelines 4. (1.37). Actually the rotor field does not exist alone but combines with the revolving field of stator to produce a resultant field, just as in the transformer, the resultant field is produced by the combination of primary and secondary ampere-turns. ABB's website uses cookies. Three-phase motors (also annotated numerically as 3-phase motors) are widely used in industry and have become the workhorse of many mechanical and electromechanical systems because of their relative simplicity, proven reliability, and long service life.
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