Anti-corrosion rotor assembly and motor

Abstract

The invention provides an anti-corrosion rotor assembly and a motor. The rotor assembly comprises a rotor core and a rotor shaft. The rotor core sleeves the rotor shaft. The rotor shaft includes a first shaft section and a second shaft section. The first shaft section is provided with a first bearing mounting position. The second shaft section is provided with a second bearing mounting position. The first shaft section and the second shaft section are arranged with an interval along an axial direction and are connected through an insulating material. The first shaft section and / or the second shaft section are insulated from the rotor core. According to the rotor assembly of the present invention, the shaft current can be greatly reduced or even completely eliminated, the phenomenon of electric corrosion can be effectively reduced or even eliminated, and the bearing life can be improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to an anti-electric corrosion rotor assembly and a motor. Background technique [0002] When the motor is running, due to the rotor in the alternating magnetic field or the asymmetry of the magnetic circuit, the shaft voltage will be generated on the rotor core and the rotor shaft. Since the rotor core is connected to the rotor shaft, the rotor shaft is connected to the inner ring of the bearing Although the inner and outer rings of the bearing will be insulated with grease, when the shaft voltage reaches a certain value, the oil film between the inner and outer rings of the bearing will be broken down due to the excessive voltage difference between the inner and outer rings of the bearing. In this way, a shaft current is formed between the front bearing of the motor, the rotor shaft, the rear bearing of the motor, and the motor base; in addition, after the oil film of th...

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Problems solved by technology

[0002] When the motor is running, due to the rotor in the alternating magnetic field or the asymmetry of the magnetic circuit, the shaft voltage will be generated on the rotor core and the rotor shaft. Since the rotor core is connected to the rotor shaft, the rotor shaft is connected to the inner ring of the bearing Although the inner and outer rings of the bearing will be insulated with grease, when the shaft voltage reaches a certain value, the oil film between the inner and outer rings of the bearing will be broken down due to the excessive voltage difference between the inner and outer rings of the bearing. In this way, a shaft current is formed between the front bearing of the motor, the rotor shaft, the rear bearing of the motor, and the motor base; in addition, after the oil film of the inner ring and outer ring of the bearing is broken down, a Corresponding axial currents are also easily formed between the iron core, the magnetic tiles, and the stator core. The axial current will cause electric corrosion on the surface of the bearing balls, thereby destroying the bearing raceway, shortening the bearing life, and easily causing noise.

[0003] In order to solve the above problems, a processing method in the prior art is as follows figure 1 As shown, the front end cover 1' and the rear end cover 2' of the motor are connected and conducted by using conductive tape, wire and other conductive materials 3'. Although this method can reduce the voltage difference between the inner and outer rings of the bearing, thereby reducing the shaft voltage and realizing Reduce the effect of shaft current on bearing damage, but the reduction effect is not ideal, especially because the conductive material is arranged on the outside of the motor, it is very easy to fall off under the action of external force, so the phenomenon of electrical corrosion is still serious, and the life of the bearing is generally low

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