Rotor, asynchronous motor, compressor

Abstract

The present invention provides a rotor, an asynchronous motor, and a compressor, wherein a rotor includes a rotor iron core sleeved on a rotating shaft and end rings at both ends of the rotor iron core in the axial direction, and the rotor iron core is configured with A plurality of guide bar grooves penetrating along the axial direction of the rotor core, guide bars are provided in the guide bar grooves, a plurality of guide bars and the end ring form a rotor squirrel cage structure, in the rotor When stationary, the guide bar is in a first position close to the rotating shaft, and when the rotor rotates, the guide bar is in a second position away from the rotating shaft, and the guide bar can be in the first position and movement between the second positions. According to a rotor, an asynchronous motor and a compressor of the present invention, when the motor starts or the rotor is stationary, the guide bar is in the first position, which improves the magnetic flux leakage and leakage reactance of the rotor core at the initial stage of starting, thereby reducing the starting current of the motor , and can reduce the starting inertia of the motor.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a rotor, an asynchronous motor and a compressor. Background technique [0002] At present, in the motor industry, asynchronous motors are still widely used. Although the use of permanent magnet motors is also increasing, permanent magnet motors need to use permanent magnets, and the price of the motor is relatively expensive. Moreover, permanent magnets are easy to demagnetize, and the motor is safe and stable. It cannot be guaranteed. At the same time, the permanent magnet motor is generally used together with the controller, which increases the overall volume of the motor. The above shortcomings lead to the need to use a three-phase asynchronous motor as the drive in many occasions. [0003] The working principle of the three-phase asynchronous motor is: when the stator winding is fed with three-phase symmetrical current, the fundamental rotating magneto...

AI Technical Summary

Problems solved by technology

Because the rotor current is the induced current, which causes the rotor speed to be 0 at the moment of starting the motor, the asynchronous motor presents a short-circuit impedance Zk to the power grid, and the current flowing through it is the starting current, and the starting current is generally 4-4% of the rated current 7 times, this will cause a great impact on the power grid, and at the same time, the starting current will cause loss in the line and inside the motor and cause heat

[0004] In order to reduce the starting current, the three-phase asynchronous motor usually uses a double squirrel cage slot or deep slot structure for the rotor, and uses the skin effect to reduce the starting current of the motor. cost, so a rotor that can reduce the starting current and reduce the use of materials has become an urgent need

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