CN209896824U

CN209896824U - Permanent magnet synchronous motor

Info

Publication number: CN209896824U
Application number: CN201920971404.3U
Authority: CN
Inventors: 宋文华
Original assignee: SUZHOU LEGO MOTORS CO Ltd
Current assignee: SUZHOU LEGO MOTORS CO Ltd
Priority date: 2019-06-26
Filing date: 2019-06-26
Publication date: 2020-01-03
Anticipated expiration: 2029-06-26

Abstract

The utility model relates to a permanent magnet synchronous motor, which comprises a casing, a rotating shaft, a bearing, a stator and a rotor; the rotor is arranged on the rotating shaft, the rotating shaft is arranged in the shell, two ends of the rotating shaft are respectively connected with the inner ring of the bearing, the outer ring of the bearing is provided with the stator, and a gap between the rotating shaft and the shell is provided with conductive lubricating grease; the bearing comprises a bearing outer ring, a bearing inner ring, a plurality of rolling bodies and a retainer, wherein the rolling bodies and the retainer are arranged between the bearing outer ring and the bearing inner ring; conductive lubricating grease positioned among the rolling bodies is arranged between the bearing inner ring and the bearing outer ring; the shell and the stator are both grounded, and the utility model adds conductive grease in the gap between the rotating shaft and the shell to ground the rotor and weaken the shaft current; conductive lubricating grease is added between the bearing inner ring and the bearing outer ring, the rotor is grounded through the stator, shaft current is weakened, improvement cost is low, and the service life of the permanent magnet synchronous motor is prolonged.

Description

Permanent magnet synchronous motor

Technical Field

The utility model belongs to the technical field of the motor, in particular to PMSM.

Background

The permanent magnet synchronous motor is a synchronous motor with an excitation system comprising one or more permanent magnets. The permanent magnet synchronous motor in recent years is developed rapidly, and is characterized by high power factor and high efficiency, and the permanent magnet synchronous motor gradually replaces the common asynchronous motor in many occasions.

The permanent magnet rotor is one of the key parts of the permanent magnet synchronous motor, and due to the reasons of insufficient concentricity and symmetry of a rotor component caused by processing precision of each part of the rotor, and other reasons of asymmetry of a stator winding and an end part, asymmetry of a mechanical structure of the motor and the like, the magnetic flux is asymmetric to generate shaft current; the rotor generates static charges by friction with air in an air gap under high-speed operation, the static charges are gradually accumulated to form shaft current, the shaft current is gradually accumulated to be large enough to puncture a bearing oil film, discharge sparks are generated on the contact surface of a bearing raceway and a rolling body to melt local positions at high temperature, and then washboard threads are formed in the high-speed operation process of the bearing, so that the service state and the service life of the bearing are greatly influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming prior art's not enough and providing one kind and increasing electrically conductive lubricating grease between the clearance of casing and rotor and bearing inner race and outer lane to make rotor ground connection, weaken the destruction of axle current to the bearing, long service life's permanent magnet synchronous motor.

In order to achieve the above purpose, the utility model adopts the technical scheme that: a permanent magnet synchronous motor comprises a shell, a rotating shaft, a bearing, a stator and a rotor; the rotor is arranged on the rotating shaft, the rotating shaft is arranged in the shell, two ends of the rotating shaft are respectively connected with the inner ring of the bearing, the outer ring of the bearing is provided with the stator, and a gap between the rotating shaft and the shell is provided with conductive lubricating grease; the bearing comprises a bearing outer ring, a bearing inner ring, a plurality of rolling bodies and a retainer, wherein the rolling bodies and the retainer are arranged between the bearing outer ring and the bearing inner ring; conductive lubricating grease positioned among the rolling bodies is arranged between the bearing inner ring and the bearing outer ring; the casing and the stator are both grounded.

Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:

firstly, conductive lubricating grease is added in a gap between a rotating shaft and a shell, so that a rotor is grounded, and shaft current is weakened;

secondly, conductive lubricating grease is added between the bearing inner ring and the bearing outer ring, so that the rotor is grounded through the stator, and the shaft current is weakened;

the improvement cost is low, the processing is convenient, and the service life of the permanent magnet synchronous motor is prolonged.

Drawings

The technical scheme of the utility model is further explained by combining the attached drawings as follows:

FIG. 1 is a front view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a front view of the bearing;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

wherein: the motor comprises a housing 1, a rotating shaft 2, a bearing 3, a stator 4, a rotor 5, conductive grease 6, a bearing outer ring 30, a bearing inner ring 31, a rolling body 32 and a retainer 33.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1-4, the permanent magnet synchronous motor of the present invention includes a casing 1, a rotating shaft 2, a bearing 3, a stator 4 and a rotor 5; the rotor 5 is arranged on the rotating shaft 3, the rotating shaft 3 is arranged in the casing 1, two ends of the rotating shaft 3 are respectively connected with the inner ring of the bearing 3, the outer ring of the bearing 3 is provided with a stator 4, and a gap between the rotating shaft 3 and the casing 1 is provided with conductive lubricating grease 6; the bearing 3 comprises a bearing outer ring 30, a bearing inner ring 31, a plurality of rolling bodies 32 arranged between the bearing outer ring 30 and the bearing inner ring 31, and a retainer 33, wherein the retainer 33 is used for supporting the rolling bodies 32, and the plurality of rolling bodies 32 are distributed in a circular array; conductive grease 6 positioned among a plurality of rolling bodies is arranged between the bearing inner ring 30 and the bearing outer ring 31; the casing 1 and the stator 4 are both grounded.

When the bearing works specifically, the conductive grease 6 is added at the gap between the rotating shaft 2 and the shell 1, so that the shaft current generated by the rotor 5 under high-speed rotation enters the shell 1 through the conductive grease 6, and the shell 1 is grounded, so that the shaft current can be guided out, the shaft current is weakened, and the service life of the bearing 3 is prolonged; meanwhile, conductive lubricating grease 6 is added between the bearing inner ring 31 and the bearing outer ring 30, so that the rotor 5 and the stator 4 are communicated through the conductive lubricating grease 6, the shaft current generated at a high speed by the rotor 5 is transmitted to the stator 4, and then flows out from the stator 4 in a grounding mode, the shaft current is further weakened, the service life of the bearing is effectively prolonged, the normal operation of the whole permanent magnet synchronous motor is guaranteed, and the permanent magnet synchronous motor has high practicability.

The above is only a specific application example of the present invention, and does not constitute any limitation to the protection scope of the present invention. All the technical solutions formed by equivalent transformation or equivalent replacement fall within the protection scope of the present invention.

Claims

1. A permanent magnet synchronous motor comprises a shell (1), a rotating shaft (2), a bearing (3), a stator (4) and a rotor (5); rotor (5) set up on pivot (2), and pivot (2) set up in casing (1), and the both ends of pivot (2) link to each other with the inner circle of bearing (3) respectively, are equipped with stator (4), its characterized in that on the outer lane of bearing (3): conductive grease (6) is arranged in a gap between the rotating shaft (2) and the shell (1); the bearing (3) comprises a bearing outer ring (30), a bearing inner ring (31), a plurality of rolling bodies (32) and a retainer (33), wherein the rolling bodies (32) and the retainer (33) are arranged between the bearing outer ring (30) and the bearing inner ring (31), the retainer (33) is used for supporting the rolling bodies (32), and the rolling bodies (32) are distributed in a circular array; conductive grease (6) positioned among the rolling bodies (32) is arranged between the bearing inner ring (31) and the bearing outer ring (30); the machine shell (1) and the stator (4) are both grounded.