In some special drag occasions, need to use the "variable pole multi-speed three-phase asynchronous motor", this motor generally has a variety of speed changes, in some special drag circuits, need to be usedTwo-speed motor; Sometimes even a three - or four-speed electric motor is required. The principle and control method of these multi-speed motors are basically the same. Yes requires access380VA class of motor powered by three-phase alternating current; These principles and control methods are basically the same.

       It changes the motor speed by changing the pole number of the stator winding of the motorThree-phase asynchronous motorThis kind of motor is generally divided into multi-winding type and but winding type;

The winding of the multi-winding type designator is embedded in the iron core groove by different independent winding (pole number is different). After the power is switched on, because the pole number of the winding is different, different speed is generated.

       The single-winding type is well understood, that is, the stator is composed of a single winding, and by changing the way of winding wiring, the motor can produce different pole numbers, so as to achieve different speed effects.

       It can be seen from the above that the variable pole motor does not need additional external equipment, in order to achieve the variable stage multi-speed three-phase asynchronous motor, only need to study the winding arrangement order to achieve the desired effect, so the multi-speed asynchronous motor in the variable pole speed motor is relatively simple, and the application is more extensive is a variable pole speed regulation mode.

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