The Working Principle of Asynchronous Motors

Description

Asynchronous motor is a device that places the rotor in a rotating magnetic field and obtains a rotational torque under the action of the rotating magnetic field, thereby causing the rotor to rotate. It is an AC motor mainly used as an electric motor.

The working principle of asynchronous motors

1. The structure of asynchronous motors

An asynchronous motor consists of two basic units: a fixed stator and a rotating rotor. The stator part mainly includes the stator core, stator winding, and base, while the rotor part mainly includes the shaft, rotor core, and rotor winding (closed conductor). There are evenly distributed slots on the inner circle of the stator core and the outer circle of the rotor core, which are used to embed the winding, as shown in the figure.

Asynchronous motor structure diagram

2. The generation of rotating magnetic field in asynchronous motors

Taking a three-phase asynchronous motor as an example, Figure 1 connects the radial two wire ends of the stator iron together to form a phase. For example, the starting end A and the terminal X are connected as one phase, the starting end B and the terminal Y are connected as one phase, and the starting end C and the terminal Z are connected as one phase. This forms a three-phase motor, which supplies three-phase symmetrical AC power to the stator three-phase winding, with equal amplitude, equal frequency, and phase difference, as shown in the figure.

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