We know the synchronous speed of a three-phase asynchronous motor=60*Power frequency/Number of magnetic poles. It is expressed by the formulan=60f/p, of whichfIt's the power frequency,pIt's the number of magnetic poles ,nIs the motor synchronous speed. Here is a small series with Senli motor to understand the content of speed and frequency.

       In our country, the frequency of three-phase alternating current is50Hz, that's it2The motor pole is that there is a pair of magnetic poles inside, and the rotation speed of the magnetic field per minute is3000, the synchronous speed is3000The rated speed of the general motor is actually the asynchronous speed, which is usually smaller than the synchronous speed.

       The frequency (power frequency) of the power supply current of China's grid isf=50HzThis is done every second50Period change), then the rotational speed of a pair of rotating magnetic fields is50r/min×60 r/min =3000 r/min.

       JoaraThree-phase asynchronous motorThe stator is separated from each other180°The two windings are joined in series as a single phase winding (e.gUPhase winding is made up of windingsU1U2withU1U2Finally, the three-phase winding is connected to the three-phase power supply according to the star connection (or triangle connection), and a rotating magnetic field with two pairs of magnetic poles can be generated.

       Every time the alternating current changes one cycle, the poles rotate the magnetic field around in space360°(i.e.1 Turn) mechanical Angle. The rotating magnetic field of the quadrupole only turns in space during the current change one week180°(i.e.1/2 Turn) mechanical Angle.

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