The resolution of the position sensor, on the other hand, can be low, allowing a less expensive sensor to be used. The inverter or power electronics for switched reluctance motors is more expensive than for a synchronous reluctance motor, for example, because of the high phase currents. The torque ripple comes from the higher phase currents that the motor requires. Synchronous motors contain multiphase AC electromagnets on the stator of the motor that create a magnetic. The SR-motor has a higher torque ripple, which makes the motor louder than, for example, a synchronous reluctance motor. A synchronous electric motor is an AC electric motor in which, at steady state, 1 the rotation of the shaft is synchronized with the frequency of the supply current the rotation period is exactly equal to an integral number of AC cycles. The production of the switched reluctance motor is relatively simple, since windings can be pre-wound and only have to be pushed onto the teeth of the stator. Since the rotor consists of only one laminated core, the SR motor is particularly good for very high speeds. As a rule, the number of poles in the stator is greater than that of the rotor. The number of stator poles and rotor poles must be different. The stator has a concentrated winding, which means that each tooth carries one winding. The stator and the rotor of the switched reluctance motor consist of salient poles. The switched reluctance motor (SRM) is also called SR-motor.
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