CN218276282U - Electric corrosion prevention device for permanent magnet synchronous motor bearing - Google Patents

Abstract

The utility model relates to a synchronous motor bearing of permanent magnetism prevents galvanic corrosion device, constitute its characterized in that including motor shaft, front end housing, first bearing, solenoid, barrel, second bearing, rear end cap, permanent magnet rotor, stator: the inner diameter of the first bearing is matched with the unequal-diameter central hole of the front end cover, a first insulating sleeve or an insulating coating is arranged on the inner diameter of the first bearing, a first insulating gasket is arranged on one side of the first bearing, a second insulating sleeve or an insulating coating is arranged on the inner diameter of the second bearing and the central counter bore of the rear end cover, and a second insulating gasket is arranged on one side of the second bearing; the utility model discloses excellent effect: the insulating sleeve or the insulating coating and the insulating gasket are added on the shaft of the traditional permanent magnet synchronous motor to prevent the current from passing through, so that the normal service life of the bearing is protected, and the service life of the bearing is prolonged by more than ninety percent.

Description

Electric corrosion prevention device for permanent magnet synchronous motor bearing

Technical Field

The utility model belongs to the technical field of the motor, specifically speaking is a permanent magnet synchronous motor bearing prevents electric corrosion device.

Background

In the prior art, current is generated between a stator and a rotor (a permanent magnet rotor and a motor shaft) in the running process of the permanent magnet synchronous motor, and the current flows through bearings at two ends, so that bearing steel balls and channels are damaged by electric corrosion. The service life of the bearing is seriously influenced, particularly, the service life of the bearing is even less than 500 hours when the frequency of the permanent magnet synchronous motor exceeds 50Hz and 3000 r/min or more.

Disclosure of Invention

In order to overcome the defect that permanent magnet synchronous motor exists among the prior art, the utility model aims at providing a permanent magnet synchronous motor bearing prevents electric corrosion device has increased bushing or insulating coating and insulating gasket protective layer at traditional permanent magnet synchronous motor's bearing and motor shaft contact position, has prevented that the electric current from passing through, has protected bearing normal life.

In order to realize the purpose, the technical scheme of the utility model is that: the utility model provides a permanent magnet synchronous motor bearing prevents electric corrosion device, including the motor shaft, the front end housing, first bearing, solenoid, the barrel, the second bearing, the rear end housing, the permanent magnet rotor, the stator is constituteed, one end at the barrel has the front end housing, the other end at the barrel has the rear end housing, the front end housing has the not constant diameter centre bore with the motor shaft, first bearing complex, assemble motor shaft and first bearing in the not constant diameter centre bore of front end housing, the external diameter of first bearing and the internal diameter cooperation of not constant diameter centre bore, the rear end housing has the central counter bore with second bearing complex, assemble the second bearing in the central counter bore of rear end housing, the external diameter of second bearing and the internal diameter cooperation of the central counter bore of rear end housing, link at the middle part of motor shaft and assemble the permanent magnet rotor, assemble the stator on the permanent magnet rotor, install the distribution magnetic coil on the stator, its characterized in that: the inner diameter of the first bearing is matched with the non-equal-diameter center hole of the front end cover, a first insulating sleeve or an insulating coating is arranged, the outer diameter of the first insulating sleeve or the insulating coating is matched with the inner diameter of the first bearing, the first insulating sleeve or the insulating coating is sleeved or coated on the motor shaft and matched with the motor shaft, a first insulating gasket is arranged on one side of the first bearing and sleeved on the motor shaft and matched with the motor shaft, a second insulating sleeve or an insulating coating is arranged on the portion, matched with the center counter bore of the rear end cover, of the inner diameter of the second bearing, the outer diameter of the second insulating sleeve or the insulating coating is matched with the inner diameter of the second bearing, the second insulating sleeve or the insulating coating is sleeved or coated on the motor shaft and matched with the motor shaft, a second insulating gasket is arranged on one side of the second bearing and sleeved on the motor shaft and matched with the second insulating gasket.

The wall thickness of the first insulating sleeve or the insulating coating is 0.3-2 mm, the height of the first insulating sleeve or the insulating coating is the same as the width of an inner ring of the first bearing, the inner diameter of the first insulating sleeve or the insulating coating is matched with the outer diameter of a motor shaft, the first insulating gasket is in an annular shape, the thickness of the annular shape is 1-3 mm, the inner diameter of the annular shape is matched with the outer diameter of the motor shaft, and the outer diameter of the annular shape is smaller than the outer diameter of the first bearing.

The wall thickness of the second insulating sleeve or the insulating coating is 0.3-2 mm, the height of the second insulating sleeve or the insulating coating is the same as the width of an inner ring of the second bearing, the inner diameter of the second insulating sleeve or the insulating coating is matched with the outer diameter of a motor shaft, the second insulating gasket is in a ring shape, the thickness of the ring shape is 1-3 mm, the inner diameter of the ring shape is matched with the outer diameter of the motor shaft, and the outer diameter of the ring shape is smaller than the outer diameter of the second bearing.

The basic principle is as follows: the utility model adds a second insulating sleeve or an insulating coating and a second insulating gasket protective layer at the contact part of the rear end cover bearing of the traditional permanent magnet synchronous motor shaft and the motor shaft, and adds a first insulating sleeve or an insulating coating and a first insulating gasket protective layer at the contact part of the front end cover bearing of the bearing retainer and the motor shaft; the first insulating sleeve or insulating coating, the first insulating gasket, the second insulating sleeve or insulating coating and the second insulating gasket are made of insulating materials and used for blocking current generated between the stator and the rotor (the permanent magnet rotor and the motor shaft) from flowing through the bearings at two ends, so that the bearing steel balls and the channels are not damaged by electric corrosion. Thereby ensuring the normal service life of the bearing.

The utility model discloses the excellent effect is: by adopting the structure, the insulating sleeve or the insulating coating and the insulating gasket are added at the contact part of the bearing and the motor shaft on the traditional permanent magnet synchronous motor shaft to prevent the current from passing through, thereby effectively solving the problem of electric corrosion of the permanent magnet synchronous motor bearing. As current is generated between a stator and a rotor (a permanent magnet rotor and a motor shaft) in the running process of the permanent magnet synchronous motor, the current flows through bearings at two ends, and the bearing steel balls and the channels are damaged by electric corrosion. The addition of the insulating sleeve or the insulating coating and the insulating gasket on the conventional permanent magnet synchronous motor shaft prevents current from passing through the bearing, so that the normal service life of the bearing is protected, and the service life of the bearing is prolonged by more than ninety percent.

Drawings

Fig. 1 is a schematic structural view of an electric corrosion prevention device (front view section) for a permanent magnet synchronous motor bearing of the present invention.

Reference numbers in the drawings: 1. the motor comprises a motor shaft, 2, a front end cover, 3, a first bearing, 4, an electromagnetic coil, 5, a machine barrel, 6, a second bearing, 7, a rear end cover, 8, a first insulating sleeve or an insulating coating, 9, a first insulating gasket, 10, a permanent magnet rotor, 11, a stator, 12, a second insulating gasket, and 13, a second insulating sleeve or an insulating coating.

Detailed Description

The attached drawings of the specification are preferred modes for implementing the invention, and the device for preventing the electric corrosion of the permanent magnet synchronous motor bearing of the invention is further described below by combining the attached drawings.

As shown in figure 1: the utility model discloses a permanent magnet synchronous motor bearing prevents galvanic corrosion device, including the motor shaft 1, front end housing 2, first bearing 3, solenoid 4, barrel 5, second bearing 6, rear end cap 7, permanent magnet rotor 10, stator 11 constitutes, front end housing 2 has at one end of barrel 5, rear end cap 7 has at the other end of barrel 5, front end housing 2 has with motor shaft 1, first bearing 3 complex unequal diameter centre bore, motor shaft 1 and first bearing 3 are installed in the unequal diameter centre bore of front end housing, the external diameter of first bearing 3 cooperates with the internal diameter of unequal diameter centre bore, rear end housing 7 has the central counter bore with second bearing 6 complex, assemble second bearing 6 in the central counter bore of rear end housing, the external diameter of second bearing 6 cooperates with the internal diameter of the central counter bore of rear end cap, hookup at the middle part of motor shaft 1 assembles permanent magnet rotor 10, a stator 11 is assembled on a permanent magnet rotor 10, a solenoid coil 4 is assembled on the stator 11, a first insulating sleeve or insulating coating 8 is arranged at the part, matched with a non-equal-diameter central hole of a front end cover, of the inner diameter of a first bearing 3, the outer diameter of the first insulating sleeve or insulating coating 8 is matched with the inner diameter of the first bearing 3, the first insulating sleeve or insulating coating 8 is sleeved or coated on a motor shaft 1 and matched with the motor shaft 1, a first insulating gasket 9 is arranged on one side of the first bearing 3, the first insulating gasket 9 is sleeved on the motor shaft 1 and matched with the motor shaft, a second insulating sleeve or insulating coating 13 is arranged at the part, matched with a central counter bore of a rear end cover 7, of the inner diameter of a second bearing 6, the outer diameter of the second insulating sleeve or insulating coating 13 is matched with the inner diameter of the second bearing 6, the second insulating sleeve or insulating coating 13 is sleeved or coated on the motor shaft 1 and matched with the motor shaft, on one side of the second bearing 6, a second insulating washer 12 is provided, which second insulating washer 12 is fitted over the motor shaft 1 and cooperates therewith.

The wall thickness of the first insulating sleeve or the insulating coating 8 is 1mm, the height of the first insulating sleeve or the insulating coating 8 is the same as the width of the inner ring of the first bearing 3, the inner diameter of the first insulating sleeve or the insulating coating 8 is matched with the outer diameter of the motor shaft 1, the first insulating gasket 9 is in an annular shape, the thickness of the annular shape is 2mm, the inner diameter of the annular shape is matched with the outer diameter of the motor shaft 1, and the outer diameter of the annular shape is smaller than the outer diameter of the first bearing 3.

The wall thickness of the second insulating sleeve or the insulating coating 13 is 1mm, the height of the second insulating sleeve or the insulating coating is the same as the width of the inner ring of the second bearing 6, the inner diameter of the second insulating sleeve or the insulating coating 13 is matched with the outer diameter of the motor shaft 1, the second insulating gasket 12 is in a ring shape, the thickness of the ring shape is 2mm, the inner diameter of the ring shape is matched with the outer diameter of the motor shaft 1, and the outer diameter of the ring shape is smaller than the outer diameter of the second bearing 6.

The basic principle is as follows: the utility model adds a second insulating sleeve or an insulating coating 13 and a second insulating gasket 12 on the rear end cover bearing shield of the traditional permanent magnet synchronous motor shaft 1, and adds a first insulating sleeve or an insulating coating 8 and a first insulating gasket 9 on the front end cover of the bearing shield; the first insulating sleeve or insulating coating 8, the first insulating gasket 9, the second insulating sleeve or insulating coating 13 and the second insulating gasket 12 are made of insulating materials and used for blocking current generated between the stator and the rotor (the permanent magnet rotor and the motor shaft) from flowing through the bearings at two ends, so that the bearing steel balls and the channels are not damaged by electric corrosion. Thereby ensuring the normal service life of the bearing.

The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (3)

1. The utility model provides a permanent magnet synchronous motor bearing prevents electric corrosion device, including motor shaft (1), front end housing (2), first bearing (3), solenoid (4), barrel (5), second bearing (6), rear end housing (7), permanent magnet rotor (10), stator (11) are constituteed, front end housing (2) have in the one end of barrel (5), rear end housing (7) have at the other end of barrel (5), front end housing (2) have with motor shaft (1), first bearing (3) complex inequality footpath centre bore, distribution motor shaft (1) and first bearing (3) are equipped with in the inequality centre bore of front end housing, the external diameter of first bearing (3) and the internal diameter cooperation of inequality centre bore, rear end housing (7) have with second bearing (6) complex center, assemble second bearing (6) in the central counter bore of rear end housing, the external diameter of second bearing (6) and the internal diameter cooperation of the central counter bore of rear end housing, connect assembly permanent magnet rotor (10) in the middle part of motor shaft (1), assemble stator (11) on permanent magnet stator (11), its characterized in that magnetic coil (4) is equipped with: the inner diameter of the first bearing (3) is matched with the unequal-diameter center hole of the front end cover, a first insulating sleeve or an insulating coating (8) is arranged on the part, matched with the inner diameter of the first bearing (3), of the inner diameter of the first insulating sleeve or the insulating coating (8), the first insulating sleeve or the insulating coating (8) is sleeved or coated on the motor shaft (1) and matched with the motor shaft, a first insulating gasket (9) is arranged on one side of the first bearing (3), the first insulating gasket (9) is sleeved on the motor shaft (1) and matched with the motor shaft, a second insulating sleeve or an insulating coating (13) is arranged on the part, matched with the center counter bore of the rear end cover (7), of the inner diameter of the second bearing (6), the outer diameter of the second insulating sleeve or the insulating coating (13) is matched with the inner diameter of the second bearing (6), the second insulating sleeve or the insulating coating (13) is sleeved or coated on the motor shaft (1) and matched with the motor shaft, a second insulating gasket (12) is arranged on one side of the second bearing (6), and matched with the motor shaft in a sleeved mode.

2. The device for preventing the electric corrosion of the permanent magnet synchronous motor bearing is characterized in that the first insulating sleeve or the insulating coating (8) has the wall thickness of 0.3-2 mm, the height of the wall thickness is the same as the width of the inner ring of the first bearing (3), the inner diameter of the first insulating sleeve or the insulating coating (8) is matched with the outer diameter of the motor shaft (1), the first insulating gasket (9) is in an annular shape, the thickness of the annular shape is 1-3 mm, the inner diameter of the annular shape is matched with the outer diameter of the motor shaft (1), and the outer diameter of the annular shape is smaller than the outer diameter of the first bearing (3).

3. The device for preventing the electric corrosion of the permanent magnet synchronous motor bearing is characterized in that the wall thickness of the second insulating sleeve or the insulating coating (13) is 0.3-2 mm, the height of the second insulating sleeve or the insulating coating is the same as the width of the inner ring of the second bearing (6), the inner diameter of the second insulating sleeve or the insulating coating (13) is matched with the outer diameter of the motor shaft (1), the second insulating gasket (12) is in a ring shape, the thickness of the ring shape is 1-3 mm, the inner diameter of the ring shape is matched with the outer diameter of the motor shaft (1), and the outer diameter of the ring shape is smaller than the outer diameter of the second bearing (6).

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