Speed Induction Motors


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Quick Details

Product Name : Speed Induction Motors
Type : Alfaa Pumpsets
Place of Origin : India
Delivery time : NA


Induction motors can also generally be run as generators if run above a critical speed (which is usually marked on the motor). Some source of electricity is needed to run the coils, but this can be provided by the motor once it is running via capacitors, or provided by external power supplies such as from a grid connecti

Single Phase

In a single phase induction motor, it is necessary to provide a starting circuit to start rotation of the rotor. If this is not done, rotation may be commenced by manually giving a slight turn to the rotor. The single phase induction motor may rotate in either direction and it is only the starting circuit which determines rotational direction.

For small motors of a few watts, the start rotation is done by means of one or two single turn(s) of heavy copper wire around one corner of the pole. The current induced in the single turn is out of phase with the supply current and so causes an out-of-phase component in the magnetic field, which imparts to the field sufficient rotational character to start the motor. Starting torque is very low and efficiency is also reduced. Such shaded-pole motors are typically used in low-power applications with low or zero starting torque requirements, such as desk fans and record players.

Larger motors are provided with a second stator winding which is fed with an out-of-phase current to create a rotating magnetic field. The out-of-phase current may be derived by feeding the winding through a capacitor or it may derive from the winding having different values of inductance and resistance from the main winding.

In some designs, the second winding is disconnected once the motor is up to speed, usually either by means of a switch operated by centrifugal force acting on weights on the motor shaft or by a positive temperature coefficient thermistor which, after a few seconds of operation, heats up and increases its resistance to a high value thereby reducing the current through the second winding to an insignificant level. Other designs keep the second winding continuously energised when running, which improves torque.

Speed Induction Motors, Speed Induction Motors manufacturers, suppliers, exporters Coimbatore, Tamil Nadu, India