Bearing insulating device, manufacturing method of bearing insulating device, and frequency conversion motor

Abstract

The invention discloses a bearing insulation device which is used for a variable frequency motor. The bearing insulation device comprises an inner steel sleeve and an outer steel sleeve, wherein the inner steel sleeve is used for wrapping an outer ring of a bearing in the variable frequency motor and being fixed outside the outer ring of the bearing, and the end face of the inner steel sleeve cannot be communicated with an end cover of the variable frequency motor; the outer steel sleeve is arranged outside the inner steel sleeve, and an insulation layer is arranged between the outer steel sleeve and the inner steel sleeve. The bearing insulation device can prevent the outer circumferential surface of the outer ring of the bearing from being directly attached to the end cover, the outer circumferential surface of the outer ring of the bearing is prevented from directly making contact with the end cover to form a series loop, high-frequency induction shaft currents produced by a frequency converter in the variable frequency motor are prevented from flowing through the bearing via the series loop, electrocorrosion effects of the high-frequency induction shaft currents on the bearing are eliminated, and the service life of the bearing is prolonged. The invention further discloses a manufacturing method of the bearing insulation device, and the manufacturing method is used for the variable frequency motor and beneficial for prolonging the service life of the bearing. The invention discloses a variable frequency motor which is provided with the bearing insulation device, and the variable frequency motor has the advantage that the service life of the bearing is long.

Description

technical field [0001] The present invention relates to the technical field of insulating equipment, and more specifically, relates to a bearing insulating device, a manufacturing method of the bearing insulating device, and also relates to a variable frequency motor. Background technique [0002] With the development of science and technology, variable frequency motors are more and more widely used in various industries. The variable frequency motor includes an output shaft, a casing, an end cover arranged on the casing, and a bearing arranged in an assembly hole of the end cover and matched with the output shaft. Among them, the output shaft of the variable frequency motor passes through the bearing at the assembly hole of the above-mentioned end cover and protrudes out of the housing; the two ends of the bearing are respectively supported by the inner bearing cover and the outer bearing cover; The cover is fixedly attached. [0003] In the existing frequency conversion ...

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Problems solved by technology

[0003] In the existing frequency conversion motor, the outer peripheral surface of the upper outer ring of the bearing is directly in contact with the end cover, so that the bearing and the end cover are directly connected in series to form a current loop, so that the high frequency induced shaft current generated by the frequency converter in the frequency conversion motor passes through the bearing, and the high frequency The induced shaft current has a serious electric corrosion effect on the bearing, which seriously affects the service life of the bearing

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