CN211063477U

CN211063477U - Magnetic suspension motor spindle

Info

Publication number: CN211063477U
Application number: CN201921749878.XU
Authority: CN
Inventors: 曹黎军
Original assignee: Zhejiang Zhaohua Machinery Manufacturing Co ltd
Current assignee: Zhejiang Zhaohua Machinery Manufacturing Co ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2020-07-21
Anticipated expiration: 2029-10-17

Abstract

The utility model discloses a magnetic suspension motor main shaft, including dabber, rotor permanent magnet and rotor core, still include position sleeve, holding ring and axial thrust dish, the holding ring is fixed at the dabber both ends, and rotor core fixes at the spindle and offsets with the holding ring, and the position sleeve cup joints at the spindle and offsets with rotor core, and the axial thrust dish cup joints to be fixed at the spindle and offsets with the holding ring. The utility model discloses well axial thrust dish is an independent part, and the assembly is fixed to the dabber, subtracts material shaping processing mode for among the prior art axial thrust dish through the cutting, the utility model discloses the structure is more simple, can simplify processing technology, and can the significantly reduced material extravagant, practices thrift manufacturing cost.

Description

Magnetic suspension motor spindle

Technical Field

The utility model relates to a motor, more specifically say, it relates to a magnetic suspension motor main shaft.

Background

Traditional motor adopts mechanical bearing to support the rotor, and mechanical bearing self still has mechanical vibration and friction at the rotor rotation in-process, not only can influence the rotational speed of rotor, still can produce noise, heat, influences motor life, and for this reason, people utility model discloses a magnetic suspension motor adopts non-contact support mode to support the rotor, can eliminate mechanical friction, improves rotational speed and life greatly. However, the existing magnetic suspension motor often has a rotor instability phenomenon due to external force interference, load change, control instability and other reasons, and after the rotor instability, the rotor can be out of control in the internal posture of the motor, and generates axial float, off-axis deflection and other motions, so that the rotor can rub and impact a shell and a stator to further damage the motor. The stability relation of the spindle structural design and the spindle operation of the magnetic suspension motor is very large, the arrangement of all parts and structures on the spindle is beneficial to keeping the stress structure balance of the spindle, and the parts are firmly installed, so that the influence of unstable factors is inhibited. Some existing magnetic suspension motor spindles are not designed with a related structure for preventing axial movement, and some existing magnetic suspension motor spindles are not reasonable in structure for preventing axial movement. The utility model with the publication number of CN205835027U specially used for 2016, 12 and 28 discloses a magnetic suspension spindle, which comprises a spindle arranged on a spindle seat, a tile-shaped electromagnet with a sensor and matched with the spindle is arranged outside the spindle, the front end of the spindle is connected with a grinding wheel, the rear end of a spindle device is connected with a driving motor through a coupling, the grinding wheel is also provided with a grinding wheel cover, the driving motor is fixed on a motor fixing seat, the motor fixing seat is connected with a grinding wheel spindle, the tile-shaped electromagnet is provided with a control electric box, the control electric box comprises a power amplification circuit, a driving controller and a sensing signal circuit, the spindle is suspended in the center of a bearing bush through adopting magnetic force, no mechanical contact exists between the spindle and the bearing bush, the spindle forms high-speed operation without mechanical friction when in operation, the rotation precision of the spindle is effectively improved, and the rotation precision can reach 0.1 mu m, and because the mechanical friction is reduced, the main shaft has the advantages of small abrasion, low noise, long service life and no maintenance during working. However, the utility model does not provide a technical means for coping with the axial play of the main shaft.

SUMMERY OF THE UTILITY MODEL

The related structure of preventing axial float is not considered to set up in some when the design of current magnetic suspension motor main shaft, and some then prevent that the structure of axial float is not too reasonable, for overcoming these defects, the utility model provides an accessible simple structure conveniently realizes preventing the magnetic suspension motor main shaft of axial float.

The technical scheme of the utility model is that: the utility model provides a magnetic suspension motor main shaft, includes dabber, rotor permanent magnet and rotor core, still includes position sleeve, holding ring and axial thrust dish, and the holding ring is fixed at the dabber both ends, and rotor core fixes at the dabber and offsets with the holding ring, and the position sleeve cup joints at the dabber and offsets with rotor core, and the axial thrust dish cup joints to be fixed at the dabber and offsets with the holding ring. The rotor permanent magnet is matched with a stator component of the magnetic suspension motor, and electromagnetic force can be generated between the rotor permanent magnet and the stator component to provide rotary driving force for the mandrel; the radial magnetic bearings are correspondingly arranged on the positions of the rotor cores, and the rotor cores and the radial magnetic bearings are matched to generate electromagnetic force to provide radial repulsive force for the mandrels, so that the mandrels are suspended in the radial magnetic bearings. The axial thrust disc is closely adjacent to and is provided with an axial magnetic bearing, the axial magnetic bearing is fixed on a shell of the magnetic suspension motor, when the axial thrust disc rotates along with the mandrel, the axial thrust disc moves relative to the axial magnetic bearing, the axial thrust disc is magnetized, a self magnetic field is also generated, and the magnetic field and the axial magnetic bearing have the same polarity and are opposite, so that repulsion force can be generated on the axial magnetic bearing, and the axial thrust disc and even the main shaft can be prevented from axially moving by the axial magnetic bearing. The utility model discloses well axial thrust dish is an independent part, and the assembly is fixed to the dabber, and position sleeve, holding ring then are the setting element, can make rotor permanent magnet, rotor core, axial thrust dish carry out reliable axial positioning at the spindle. The utility model provides an axial thrust dish is not like prior art through cutting the processing mode of cutting down the material at the integrative axial thrust dish that generates of dabber, and the material that can significantly reduce like this is extravagant, simplifies processing technology.

Preferably, the mandrel is provided with a radial boss, the rotor permanent magnet and the axial thrust disc are respectively positioned on two sides of the radial boss, the rotor permanent magnet is respectively abutted against the positioning sleeve and the radial boss, and two ends of the axial thrust disc are respectively abutted against the positioning sleeve and the radial boss. The positioning sleeve and the positioning ring are matched with the radial boss, so that the rotor permanent magnet, the rotor iron core and the axial thrust disc can be reliably and axially positioned on the mandrel.

Preferably, the axial thrust disc comprises a thrust disc ring sleeve and a disc body protruding in the radial direction, the disc body is located on the outer peripheral surface of the thrust disc ring sleeve, the thrust disc ring sleeve and the disc body are of an integrally formed structure, and the thrust disc ring sleeve is sleeved on the mandrel. The axial thrust disc with the structure can be conveniently arranged on the mandrel, and provides an axial force bearing surface for receiving the axial restraining force of the axial magnetic bearing.

Preferably, the thrust disc sleeve is in interference fit with the mandrel. The axial thrust disc and the mandrel are reliably fixed through static friction force generated by interference fit.

Alternatively, the thrust disk collar is keyed to the spindle. Through the key-type connection, thrust disc ring cover can realize the circumferential direction location at the dabber, and the axial restraint of borrowing the axial restraint of position sleeve, holding ring, radial boss again, finally realizes the reliable fixed of axial thrust dish at the dabber.

Preferably, the rotor permanent magnet is tile-shaped, and the rotor permanent magnet is adhered and bonded on the circumferential surface of the mandrel. The rotor permanent magnet is bonded on the mandrel, so that the structure is simple and the implementation is convenient.

Preferably, the retaining ring is threadedly connected to the mandrel. The positioning ring is connected to the mandrel through threads, and is simple in structure and convenient to implement.

The utility model has the advantages that:

the structure is simple. The utility model discloses well axial thrust dish is an independent part, and the assembly is fixed to the dabber, subtracts material shaping processing mode for among the prior art axial thrust dish through the cutting, the utility model discloses the structure is more simple, can simplify processing technology.

The production cost is saved. The utility model discloses well axial thrust dish need not to cut down material mode machine-shaping through cutting, and the material that can significantly reduce is extravagant like this, practices thrift manufacturing cost.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of an axial thrust disc of the present invention;

fig. 3 is a schematic longitudinal sectional structure of a magnetic levitation motor to which the present invention is applied.

In the figure, 1-mandrel, 2-rotor permanent magnet, 3-positioning sleeve, 4-rotor iron core, 5-positioning ring, 6-axial thrust disc, 7-radial boss, 8-thrust disc ring sleeve, 9-disc body, 10-shell, 11-stator assembly, 12-radial magnetic bearing, 13-axial magnetic bearing, 14-permanent magnet sheath, 15-volute.

Detailed Description

The present invention will be further described with reference to the following detailed description of the embodiments.

Example 1:

as shown in fig. 1 to 3, a spindle of a magnetic levitation motor is disposed in the magnetic levitation motor, the magnetic levitation motor includes a housing 10, a stator assembly 11 and a magnetic bearing set, the stator assembly 11 is disposed in the housing 10, the spindle of the magnetic levitation motor is rotatably connected to the stator assembly 11, and the magnetic bearing set is sleeved on the spindle of the magnetic levitation motor. The output end of the housing 10 is connected to a volute 15 of a blower. This magnetic suspension motor main shaft includes dabber 1, rotor permanent magnet 2, axial thrust dish 6, position sleeve 3, rotor core 4 and holding ring 5, holding ring 5 passes through the threaded fixation at 1 both ends of dabber, rotor core 4 cup joints at dabber 1 and offsets with 5 inner offsets of holding ring, position sleeve 3 cup joints at dabber 1 and offsets with 4 inner of rotor core, the integrative radial boss 7 that is equipped with of front end in the dabber 1, rotor permanent magnet 2, axial thrust dish 6 is located radial boss both sides respectively, rotor permanent magnet 2 offsets with position sleeve 3 and radial boss 7 respectively, 6 both ends of axial thrust dish offset with position sleeve 3 and radial boss 7 respectively. The rotor permanent magnets 2 are tile-shaped and are two in total, the rotor permanent magnets 2 are attached to the circumferential surface of the mandrel 1, and a rotor permanent magnet partition plate is arranged between the two rotor permanent magnets 2, so that the two rotor permanent magnets 2 keep the relative positions unchanged. A permanent magnet sheath 14 is sleeved outside the rotor permanent magnet 2. The magnetic bearing group comprises two axial magnetic bearings 13 and two radial magnetic bearings 12, the axial magnetic bearings 13 are arranged in pairs, the axial thrust disc 6 is positioned between the paired axial magnetic bearings 13, and the two radial magnetic bearings 12 are respectively sleeved at the two ends of the main shaft 3 and are overlapped with the rotor iron core 4. The axial thrust disc 6 comprises a thrust disc ring sleeve 8 and a disc body 9 protruding in the radial direction, a central through hole is formed in the thrust disc ring sleeve 8, the disc body 9 is located on the outer peripheral surface of the thrust disc ring sleeve 8, the thrust disc ring sleeve 8 and the disc body 9 are integrally formed by 40CrNiMoA steel, and the thrust disc ring sleeve 8 is sleeved on the mandrel 1 in an interference mode.

After the magnetic suspension motor is started, the axial magnetic bearing 13 is electrified to become an electromagnet, because the rotor core 4 is superposed with the radial magnetic bearing 12, the rotor core 4 rotating along with the mandrel 1 and the radial magnetic bearing 12 generate relative motion, so that the magnetic suspension motor is magnetized, a magnetic field is also generated, the magnetic field is opposite to the radial magnetic bearing 12 in the same polarity, and repulsion force is generated to the radial magnetic bearing 12, so that the mandrel 1 is suspended in the radial magnetic bearing 12. Similarly, the radial magnetic bearing 12 becomes an electromagnet when being electrified, the axial thrust disc 6 rotating along with the mandrel 1 moves relative to the axial magnetic bearing 13, the axial thrust disc 6 is magnetized, and a magnetic field per se is also generated and has the same polarity with the axial magnetic bearing 13, so that repulsion force can be generated for the axial magnetic bearing 13, and the axial magnetic bearing 13 can prevent the axial thrust disc 6 and even the main shaft of the magnetic suspension motor from generating axial movement.

Example 2:

the thrust disc ring sleeve 8 is connected with the mandrel 1 in a key way. The rest is the same as example 1.

Claims

1. The utility model provides a magnetic suspension motor main shaft, including dabber (1), rotor permanent magnet (2) and rotor core (4), characterized by, still include position sleeve (3), holding ring (5) and axial thrust dish (6), holding ring (5) are fixed at dabber (1) both ends, rotor core (4) are fixed on dabber (1) and are offset with holding ring (5), position sleeve (3) cup joint on dabber (1) and offset with rotor core (4), axial thrust dish (6) are fixed on dabber (1) and offset with holding ring (5).

2. The magnetic suspension motor spindle as claimed in claim 1, wherein the spindle (1) is provided with a radial boss (7), the rotor permanent magnet (2) and the axial thrust disc (6) are respectively located on both sides of the radial boss (7), the rotor permanent magnet (2) respectively abuts against the positioning sleeve (3) and the radial boss, and both ends of the axial thrust disc (6) respectively abut against the positioning sleeve (3) and the radial boss (7).

3. The magnetic suspension motor spindle as claimed in claim 1, characterized in that the axial thrust disk (6) comprises a thrust disk ring sleeve (8) and a radially protruding disk body (9), the disk body (9) is located on the outer circumferential surface of the thrust disk ring sleeve (8), the thrust disk ring sleeve (8) and the disk body (9) are of an integrally formed structure, and the thrust disk ring sleeve (8) is sleeved on the spindle (1).

4. A magnetic levitation motor spindle as claimed in claim 3, characterised in that the thrust disc collar (8) is an interference fit with the spindle (1).

5. A magnetic levitation motor spindle as claimed in claim 3, characterised in that the thrust disk collar (8) is keyed to the spindle (1).

6. The magnetic suspension motor spindle according to any one of claims 1 to 5, characterized in that the rotor permanent magnet (2) is tile-shaped, and the rotor permanent magnet (2) is adhered to the circumference of the spindle (1).

7. Magnetic levitation motor spindle according to any of claims 1 to 5, characterised in that the positioning ring (5) is screwed to the spindle (1).