Motor rotor and motor

Abstract

The invention provides a motor rotor and a motor. The motor rotor comprises an iron core and a squirrel cage. A plurality of skewed slots are formed on the outer circumferential wall of the iron core,and the skewed slots are parallel to each other; an included angle is formed between a connecting line of a start point and an end point of the skewed slot and the axis of the iron core; the skewed slot is a sine wave skewed slot; the sine wave skewed slot extends from one end of the iron core to the other end in the shape of the sine wave, and the squirrel cage is provided with a plurality of guide bars, the shape of each guide strip is matched with the skewed slot, and each guide strip is respectively arranged in each corresponding skewed slot. According to the motor rotor and the motor, the transverse current of the guide bar can be greatly reduced; the tooth harmonic magnetic field is weakened, so that the additional ferromagnetic loss resulting from the lateral current are significantly reduced, the axial pulsation of the rotor is reduced, the starting performance and operation efficiency of the motor are improved, the electromagnetic noise and the pulse vibration noise are effectively reduced, and the energy saving effect is obvious.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a motor rotor and a motor. Background technique [0002] With the development of modern industry, the requirements for the operation accuracy and stability of various mechanical equipment are getting higher and higher. Most of these equipment are driven by motors. [0003] Industrial motors often use three-phase asynchronous motors, and their electromagnetic noise is mainly caused by electromagnetic waves that change with time and space due to the interaction of stator and rotor harmonic magnetic fields, which prompts the stator to generate high multiple power frequency vibrations. In order to effectively reduce the aforementioned electromagnetic noise, asynchronous motors mostly adopt a stator-rotor inclined slot structure to weaken the harmonic magnetic field, thereby suppressing the harmonic electromagnetic force, but the suppression ability is relative...

AI Technical Summary

Problems solved by technology

In order to effectively reduce the aforementioned electromagnetic noise, asynchronous motors often use a stator-rotor inclined slot structure to weaken the harmonic magnetic field, thereby suppressing the harmonic electromagnetic force, but the suppression ability is relatively limited

In addition, the distance between the two grooves of the rotor punching plate does not change after the chute is used, and the shortest distance between the cast aluminum guide bars will be multiplied by the cosine value of the chute angle (the value is generally less than 1), so that the two cast aluminum The distance between the aluminum squirrel cage bars is closer. At the same time, there is an induced potential in the squirrel cage bars, which increases the transverse current in the iron core and induces high-frequency current in the rotor iron core. In the case of poor insulation of the chute It will increase the stray loss of the load. For medium and large motors or long iron core motors, the traditional chute will cause a large torsional moment, which will cause torsional vibration, which will lead to loud motor noise and affect the strength of the rotor mechanical structure; Or, when the rotor adopts the traditional chute structure, the electromagnetic force generated on the stator core teeth will have an extra axial component, and the axial component is the main source of the axial force. When the axial force is large, the Increased wear of motor bearings reduces the service life of the motor, and the axial component of the air-gap magnetic field increases iron loss

[0004] In addition, the cast aluminum guide bar in the groove of the cast aluminum rotor is often caused by the die-casting process, which causes the cast aluminum to be not full and produces air bubbles, which increases the heat loss of the guide bar and the overall unbalance of the cast aluminum rotor, and at the same time makes the cast aluminum guide bar easy to break

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