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AC Motor

AC Motor
AC motors are electric motors driven by alternating current (AC). AC motors are widely used in industry, primarily due to their high efficiency, and their ability to produce constant torque up to the rated speed.
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AC motor


The two most widely used types of AC motors are induction motors and synchronous motors.



How AC Motors Work

The two basic parts of an AC motor are the stator and the rotor; the rotating inner portion of the motor which is attached to (and drives) the motor shaft. Both the stator and the rotor produce rotating magnetic fields. In the windings of the stator, this rotating field is provided inherently by the sinusoidal nature of alternating current. In the rotor, the magnetic field is created by permanent magnets, reluctance saliency, or by additional electrical windings.

Synchronous motors operate in lock step with the frequency of the supply current because their rotors have either permanent magnets or electromagnets generating the rotating electromagnetic field.

In an induction motor, the magnetic field in the windings of the rotor is ‘induced’ by the magnetic field of the stator.  In order for this induction to produce torque, the speed of the rotor’s field must lag the field of the stator’s magnetic field. This speed differential is known as “slip”, and is the reason that induction motors will have a “nameplate RPM” rating that is about 5% less than their synchronous speed. For example, an Ironhorse model MTRP-001-3DB18 (1hp, three phase, four pole, AC induction motor) has a synchronous speed rating of 1800 RPM (assuming 60hz power), but the “Nameplate RPM” rating is 1760.  This motor shaft will turn at 1760 RPM when powered “across the line” with the US standard of 60 Hz three-phase power.




Hengsu Holdings is one of the leading China manufacturers and suppliers professional in manufacturing ac motor. As one of the famous electric motor brands, we will offer you reasonable price. Welcome to buy our quality electric motor made in China and check the price list with our factory.
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