Allied Electronics Data Handbook by N. Cooke

By N. Cooke

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5. Unlike a shunt wound DC motor, the stator field flux in an induction motor is also derived from the supply voltage and the flux density in the air gap will be affected by changes in the frequency of the supply voltage. The air-gap flux (Φ) of an AC induction motor is directly proportional to the magnitude of the supply voltage (V) and inversely proportional to the frequency (f). Air-gap Flux Φ ∝ V f To maintain a constant field flux density in the metal parts during speed control, the stator voltage must be adjusted in proportion to the frequency.

Introduction  Theoretically, the eddy current coupling should be able to provide a full range of output speeds and torques from zero up to just below the rated speed and torque of the motor, allowing of course for slip. In practice, this is limited by the amount of torque that can be transferred continuously through the coupling without generating excessive heat. When stability is reached between the motor and the driven load connected by an Eddy Current coupling, the output torque on the shaft is equal to the input torque from the AC motor.

These resistors have the added advantage of providing a standby solution in the event of a SER converter failure, when the motor can be started and run at fixed speed without the SER system. • For additional flexibility, a bypass contactor is usually provided to short circuit the rotor windings and allow the motor to run at fixed speed. The slip energy recovery system is most often used by large water supply authorities for soft starting and limited speed control of large centrifugal pumps, typically 1 MW to 10 MW.

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