Low Voltage Induction Motor 280KW

Product Introction

This series of low voltage induction motor is suitable for continuous working duty (S1), having the characteristics of low loss, high efficiency, compact structure, stable operation, low vibration, low noise, long service life, convenient use and maintenance, etc. They can be widely mounted in machine tools, water pumps, fans, compressors, reducers, and also suitable for many mechanical transmission equipments, such as transportation, mixing, printing, agricultural machinery, food, etc.

According to Faraday's law an emf induced in any circuit is due to the rate of change of magnetic flux linkage through the circuit. As the rotor winding in an induction motor are either closed through an external resistance or directly shorted by end ring, and cut the stator rotating magnetic field, an emf is induced in the rotor copper bar and due to this emf a current flows through the rotor conductor. Here the relative speed between the rotating flux and static rotor conductor is the cause of current generation; hence as per Lenz's law, the rotor will rotate in the same direction to reduce the cause, i.e., the relative velocity.

Thus from the working principle of three phase induction motor, it may be observed that the rotor speed should not reach the synchronous speed produced by the stator. If the speeds become equal, there would be no such relative speed, so no emf induced in the rotor, and no current would be flowing, and therefore no torque would be generated. Consequently, the rotor cannot reach the synchronous speed. The difference between the stator (synchronous speed) and rotor speeds is called the slip. The rotation of the magnetic field in an induction motor has the advantage that no electrical connections need to be made to the rotor.

The stator of an induction motor consists of a number of overlapping windings offset by an electrical angle of 120°. When the primary winding or stator is connected to a 3 phase A.C. supply, it establishes a rotating magnetic field which rotates at a synchronous speed. The direction of rotation of the motor depends on the phase sequence of supply lines and the order in which these lines are connected to the stator. Thus, interchanging the connection of any two primary terminals to the supply will reverse the direction of rotation.

The number of poles and the frequency of the applied voltage determine the synchronous speed of rotation in the motor's stator. Motors are commonly configured to have 2, 4, 6 or 8 poles. The synchronous speed, a term given to the speed at which the field produced by primary currents will rotate, is determined by the following expression.

Outline Dimensions

Motor Parameters

Main Technical Parameters

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