Electric motor rotor, electric motor, air conditioner, and production method for electric motor rotor

A manufacturing method and motor technology, applied in the direction of electric components, electrical components, electromechanical devices, etc., can solve the problems of cost increase, insulation part detachment, etc., and achieve the effect of preventing shaft current, preventing abnormal sound, and inhibiting electrical corrosion

CN102792558BActive Publication Date: 2014-12-24MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-12-24

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Patent Text Reader

Abstract

An electric motor rotor is provided in which an insulating sleeve applied to a shaft for performing insulation between a roller bearing and a shaft to suppress electrolytic corrosion of a bearing can be surely fixed by a simple method. In an electric motor rotor 20 according to the present invention, a rotor resin magnet 22 and a shaft 23 are integrated by a resin section 24 and a roller bearing is arranged in the shaft 23. An insulating sleeve 26 is provided between the shaft 23 and the roller bearing, and the insulating sleeve 26 is integrated and fixed by the resin section 24.
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Description

technical field

[0001] The present invention relates to a rotor of an electric motor using a rolling bearing, and relates to a rotor of an electric motor suitable for an electric motor driven by an inverter. Furthermore, it relates to an electric motor using the rotor of the electric motor, a method of manufacturing the rotor of the electric motor, and an air conditioner equipped with the electric motor. Background technique

[0002] Conventionally, when an inverter is used to drive a motor, the carrier frequency of the inverter has been set high for the purpose of reducing noise of the motor accompanying switching of transistors in a power circuit. As the carrier frequency is set higher, the shaft voltage generated on the shaft of the motor due to high-frequency induction increases, and the potential difference between the inner ring and outer ring of the rolling bearing supporting the shaft increases, so the current flow is easy. flow to rolling bearings. The current flo...

Examples

Embodiment approach 1

[0033] Figure 1 to Figure 14 is a diagram showing Embodiment 1, figure 1 is a cross-sectional view of the motor 100, figure 2 is a perspective view of the stator 40, image 3 is a cross-sectional view of the rotor 20, Figure 4 is an enlarged sectional view of the opposite-to-load side end of the shaft 23, Figure 5 is a diagram showing the insulating sleeve 26 ((a) is a front view, (b) is a side view), Image 6 It is a figure which shows the resin magnet 22 of a rotor ((a) is a left side view, (b) is A-A cross-sectional view of (a), (c) is a right side view), Figure 7 It is a diagram showing the resin magnet 25 for position detection ((a) is a left side view, (b) is a front view, and (c) is an enlarged view of part A of (b)), Figure 8 is a cross-sectional view of the rotor 20 of Modification 1, Figure 9 is a cross-sectional view of the rotor 20 of Modification 2, Figure 10 is a front view of the insulating sleeve 26 used in the rotor 20 of Modification 2, Figur...

Embodiment approach 2

[0140] Figure 15 It is a figure which shows Embodiment 2, and is a structural figure of the air conditioner 300. FIG.

[0141] The air conditioner 300 includes an indoor unit 310 and an outdoor unit 320 connected to the indoor unit 310 . An indoor unit blower (not shown) is mounted on the indoor unit 310 , and an outdoor unit blower 330 is mounted on the outdoor unit 320 .

[0142] Furthermore, the air blower 330 for an outdoor unit and the air blower for an indoor unit are provided with the electric motor 100 of Embodiment 1 mentioned above as a drive source.

[0143] The durability of the air conditioner 300 is improved by mounting the electric motor 100 according to Embodiment 1 on the outdoor unit blower 330 and the indoor unit blower which are main components of the air conditioner 300 .