High-power variable frequency motor insulation bearing sleeve

Abstract

A high-power variable frequency motor insulation bearing sleeve comprises a motor shaft, a bearing, a bearing inner cap, a bearing outer cap, an oil baffle ring and a baffle ring, wherein an insulation sleeve is arranged out of the bearing. The high-power variable frequency motor insulation bearing sleeve is characterized in that the insulation sleeve comprises an inner insulation spacer arranged between the bearing and the bearing inner cap, an outer insulation spacer arranged between the bearing and the bearing outer cap, a rear end cap arranged out of the bearing, and a gap insulation strip and a glass fiber insulation layer arranged between the rear end cover and a bearing seat. Three insulation strips are respectively arranged on the left side, the right side and the outer circle of the bearing, can effectively cut off a loop of a motor shaft current, and prevent the motor shaft current from forming a current loop through a motor bearing end cap and a motor base to destroy bearing balls, raceway surface roughness and oil film, and furthermore the bearing is protected. In addition, the insulation strips are simple in structure, convenient to manufacture, low in cost, and convenient to replace, and therefore manufacturing cost of a motor is reduced, and production cycles of motor forming products are guaranteed.

Description

technical field [0001] The invention relates to an insulated bearing sleeve of a high-power variable-frequency motor, which is mainly suitable for 75-1000KW variable-frequency motors. Background technique [0002] The variable frequency motor is powered by a frequency converter, and the power supply voltage contains a large number of high-order harmonics, which are easy to induce a large amount of capacitive coupling current, which causes a large amount of shaft current to be generated in the motor rotor, and the shaft current forms a current through the motor bearing end cover and frame circuit. The current flowing through the bearing will destroy the oil film of the bearing, and the arc will emit pitting on the surface of the ball and raceway, destroying the surface roughness and oil film of the bearing ball and raceway, causing the bearing temperature to rise and burn out. In order to prevent the shaft current from damaging the bearing, the shaft current loop should be c...

AI Technical Summary

Problems solved by technology

However, due to the difficulty in manufacturing insulated bearings, the price is expensive, and the delivery cycle is long, which affects the production cycle of motor molding products

Images