施耐德模块TSXP571634M

施耐德模块TSXP571634M

施耐德模块TSXP571634M

电磁力对于转子转轴所形成的转矩称为电磁转矩T，在它的作用下，电动机转子便转动起来。当三相定子绕组接至三相电源后，三相绕组内将流过对称的三相电流，并在电动机内产生一个旋转磁场。

当p=l时，图中用一对以恒定同步转速n0（旋转磁场的转速）按顺时针方向旋转的电磁铁来模拟该旋转磁场，在它的作用下，转子导体逆时针方向切割磁力线而产生感应电动势。感应电动势的方向由右手定则确定。由于转子绕组是短接的,所以在感应电动势的作用下，产生感应电流，即转子电流I2。

即异步电动机的转子电流是由电磁感应而产生的，因此这种电动机又称为感应电动机。由图可见，电磁转矩与旋转磁场的转向是一致的，故转子旋转的方向与旋转磁场的方向相同。（但电动机转子的转速n必须低于旋转磁场转速n0。

如果转子转速达到n0，那末转子与旋转磁场之间就没有相对运动，转子导体将不切割磁通,于是转子导体中不会产生感应电动势和转子电流，也不可能产生电磁转矩，所以电动机转子不可能维持在转速n0状态下运行。可见该） 电动机只有在转子转速n低于同步转速n0时,才能产生电磁转矩并驱动负载稳定运行。因此这种电动机称为异步电动机。

施耐德模块TSXP571634M

The torque formed by the electromagnetic force for the rotor shaft is called the electromagnetic torque T, and under its action, the motor rotor will rotate. When the three-phase stator winding is connected to the three-phase power supply, a symmetrical three-phase current will flow through the three-phase winding, and a rotating magnetic field will be generated in the motor.

When p=l, the figure uses a pair of electromagnets rotating clockwise at a constant synchronous speed n0 (rotation speed of the rotating magnetic field) to simulate the rotating magnetic field. Under its action, the rotor conductor cuts the magnetic field line counterclockwise to generate induced electromotive force. The direction of the induced electromotive force is determined by the right hand rule. Because the rotor winding is shorted, the induced current is generated under the action of the induced electromotive force, that is, the rotor current I2.

That is, the rotor current of the asynchronous motor is generated by electromagnetic induction, so this motor is also called induction motor. It can be seen from the figure that the direction of the electromagnetic torque and the rotating magnetic field are consistent, so the direction of the rotor rotation is the same as that of the rotating magnetic field. However, the motor rotor speed n must be lower than the rotating magnetic field speed n0.

If the rotor speed reaches n0, then there is no relative motion between the rotor and the rotating magnetic field, the rotor conductor will not cut the magnetic flux, so the rotor conductor will not generate induced electromotive force and rotor current, and it is impossible to produce electromagnetic torque, so the motor rotor cannot maintain the speed n0 state of operation. It can be seen that the motor can generate electromagnetic torque and drive the load to run stably only when the rotor speed n is lower than the synchronous speed n0. So this kind of motor is called asynchronous motor.