CN113315301A - Magnetic suspension high-speed asynchronous motor - Google Patents
Magnetic suspension high-speed asynchronous motor Download PDFInfo
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- CN113315301A CN113315301A CN202110504658.6A CN202110504658A CN113315301A CN 113315301 A CN113315301 A CN 113315301A CN 202110504658 A CN202110504658 A CN 202110504658A CN 113315301 A CN113315301 A CN 113315301A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/02—Shafts; Axles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/32—Structural association of asynchronous induction motors with auxiliary mechanical devices, e.g. with clutches or brakes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention relates to the field of magnetic suspension motors, in particular to a magnetic suspension high-speed asynchronous motor. The motor comprises a shell, a stator, a motor shaft, a radial bearing and an axial bearing; the motor shaft comprises a first shaft section, two second shaft sections respectively positioned at the outer sides of two ends of the first shaft section and two third shaft sections respectively positioned at the outer sides of two ends of the second shaft section; a permanent magnet is arranged in the first shaft section, a copper-clad layer is arranged on the surface of the first shaft section, and the first shaft section is connected with the driving end of the stator; the second shaft section and the third shaft section are respectively connected with the axial bearing supporting end and the radial bearing supporting end. The motor improves the rotating speed and power of the high-speed motor and the heat dissipation performance of the motor by arranging the copper-clad layer on the surface of the rotor without arranging a sheath.
Description
Technical Field
The invention relates to the field of magnetic suspension motors, in particular to a magnetic suspension high-speed asynchronous motor.
Background
With the development of science and technology and the demand of production, magnetic suspension high-speed motors have become one of the hot spots of international electrotechnical field research. Because the magnetic suspension high-speed motor has the advantages of high energy density, small structural size, high efficiency and the like, the magnetic suspension high-speed motor is widely applied to the industrial fields of micro gas turbines, high-speed centrifugal compressors, molecular pumps, high-speed processing centers, flywheel energy storage and the like at present, and the application range of the magnetic suspension high-speed motor is still continuously expanded. In the working process of the magnetic suspension motor, the stability of a motor rotor is the key for ensuring the stable and efficient operation of the motor. The magnetic property of the permanent magnet of the motor rotor and the dynamic balance of the rotor directly influence the working performance of the magnetic suspension motor.
The Chinese patent application (publication No. CN108988534B, published: 20200619) discloses a high-speed permanent magnet motor rotor and a processing method thereof, wherein the high-speed permanent magnet motor rotor comprises a rotating shaft, the rotating shaft comprises a first shaft body, a second shaft body and a third shaft body from left to right, soaking sleeves are arranged on the first shaft body and the third shaft body and are closely matched with a magnetic bearing sensor rotor assembly, a magnetic bearing sensor rotor silicon steel sheet, a magnetic bearing rotor assembly and a magnetic bearing rotor silicon steel sheet, a rotor iron core is sleeved on the second shaft body, a surface-mounted permanent magnet is arranged on the periphery of the rotor iron core, and a carbon fiber sheath is wrapped on the periphery of the permanent magnet. The rotor of the invention has compact and reliable integral structure; the radial tension resistance and the tangential stress resistance are strong; the permanent magnet in the permanent magnet motor is effectively protected; the heat dissipation capability is strong; the processing method can reasonably and efficiently process the high-quality high-speed permanent magnet motor rotor through the close fit among different steps.
The prior art has the following defects: the traditional high-speed motor is a permanent magnet motor, a sheath is required on the outer surface of magnetic steel, and the mechanical property can be limited in a shaft system with high rotating speed and high power. The sheath is made of carbon fibers and nickel-based alloy, the heat conducting performance is general, the working temperature of the magnetic steel in the sheath is difficult to derive, and the service life of the magnetic steel is shortened.
Disclosure of Invention
The purpose of the invention is: aiming at the problems, the copper-clad rotor of the magnetic suspension high-speed asynchronous motor is provided, wherein the copper-clad layer is arranged on the surface of the rotor without arranging a sheath, so that the rotating speed and power of the high-speed motor and the heat dissipation performance of the motor are improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnetic suspension high-speed asynchronous motor comprises a shell, a stator, a motor shaft, a radial bearing and an axial bearing; the motor shaft comprises a first shaft section, two second shaft sections respectively positioned at the outer sides of two ends of the first shaft section and two third shaft sections respectively positioned at the outer sides of two ends of the second shaft section; a permanent magnet is arranged in the first shaft section, a copper-clad layer is arranged on the surface of the first shaft section, and the first shaft section is connected with the driving end of the stator; the second shaft section and the third shaft section are respectively connected with the axial bearing supporting end and the radial bearing supporting end.
Preferably, the two second shaft segments and the two third shaft segments are both axially symmetrically distributed along the first shaft segment.
Preferably, the copper-clad layer comprises a concave part in the middle and convex parts on two sides, and the width of the concave part is the same as that of the driving end of the stator.
Preferably, the diameter of the second shaft section cylinder is smaller than that of the first shaft section cylinder, and a first shaft shoulder is formed on the outer end face of the first shaft section at the connecting position of the second shaft section and the first shaft section; the diameter of the third shaft section cylinder is smaller than that of the second shaft section cylinder, and a second shaft shoulder is formed on the outer end face of the second shaft section at the connecting position of the third shaft section and the second shaft section; the first shaft shoulder and the second shaft shoulder are magnetic conductive surfaces, and are respectively connected with the stator magnetic circuit supporting end of the axial bearing.
Preferably, the second shaft section and the third shaft section are connected by a bevel transition.
Preferably, the outer surface of the third shaft section is provided with a radial magnetic bearing rotor assembly, and the radial magnetic bearing rotor assembly is connected with the magnetic circuit supporting end of the radial bearing.
Preferably, the motor shaft further comprises fourth shaft sections, and the two fourth shaft sections are respectively positioned at the outer sides of the two third shaft sections; the outer surface of the fourth shaft section is sleeved with punching sheets which are mutually stacked and attached in the axial direction, and the punching sheets on the fourth shaft section are connected with the induction end of the axial sensor.
Preferably, the motor shaft further comprises a fifth shaft section, the two fifth shaft sections are located on the outer sides of the two fourth shaft sections respectively, and the outer surface of each fifth shaft section is matched with the inner ring of the non-magnetic radial bearing.
Preferably, the outer surface of the cylinder of the fifth shaft section is provided with a face tooth, and the face tooth is matched with the connection part of the impeller.
Preferably, the end face of the outer side of the fifth shaft section is provided with a screw hole, and the impeller is fixed on the screw hole and connected with the motor shaft.
The magnetic suspension high-speed asynchronous motor adopting the technical scheme has the advantages that:
the copper-clad layer and the shaft are integrated, the mechanical property is excellent, and the limits of the rotating speed and the power of the high-speed motor are greatly improved. The heat conductivity of copper is 10 times higher than that of carbon fiber and 6.5 times higher than that of nickel-based alloy, and the heat dissipation of the motor is greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the structure of the motor shaft.
Fig. 3 is a schematic structural diagram of a magnetic field loop of the axial bearing.
Fig. 4 is a schematic structural diagram of a radial bearing magnetic field loop.
Fig. 5 is a schematic structural diagram of a stator and a copper-clad magnetic field.
11-front bearing seat, 12-rear bearing seat, 13-sensor, 14-protective bearing, 51-radial bearing stator and 52-radial bearing rotor.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
Example 1
1-5, the motor comprises a casing 1, a stator 2, a motor shaft 3, a radial bearing 5 and an axial bearing 6; the motor shaft 3 includes a first shaft section 31, two second shaft sections 32 respectively located outside both ends of the first shaft section 31, and two third shaft sections 33 respectively located outside both ends of the second shaft sections 32; a permanent magnet is arranged inside the first shaft section 31, a copper-clad layer 34 is arranged on the surface of the first shaft section 31, and the first shaft section 31 is connected with the driving end of the stator 2; the second shaft section 32 and the third shaft section 33 are engaged with the axial bearing 6 support end and the radial bearing 5 support end, respectively. In the scheme, the copper-clad layer 34 and the shaft are integrated, the mechanical property is excellent, and the rotating speed and the power limit of the high-speed motor are greatly improved. The heat conductivity of copper is 10 times higher than that of carbon fiber and 6.5 times higher than that of nickel-based alloy, and the heat dissipation of the motor is greatly improved.
Both the second shaft segments 32 and both the third shaft segments 33 are axially symmetrically distributed along the first shaft segment 31. Copper clad layer 34 includes a lower recess 35 in the middle and raised portions 36 on both sides, lower recess 35 having the same width as the drive end of stator 2.
The cylindrical diameter of the second shaft section 32 is smaller than that of the first shaft section 31, and a first shaft shoulder 37 is formed on the outer end face of the first shaft section 31 at the connecting position of the second shaft section 32 and the first shaft section 31; the cylindrical diameter of the third shaft section 33 is smaller than that of the second shaft section 32, and a second shaft shoulder 38 is formed on the outer end face of the second shaft section 32 at the connecting position of the third shaft section 33 and the second shaft section 32; the first shoulder 37 and the second shoulder 38 are both magnetically conductive surfaces, and the first shoulder 37 and the second shoulder 38 are respectively engaged with the stator magnetic circuit supporting end of the axial bearing 6. The magnetic conduction surfaces of the first shaft shoulder 37 and the second shaft shoulder 38 are in a group, and the axial position is kept under the driving of a stator magnetic circuit of the axial bearing 6; therefore, the axial bearing 6 is made into a structure without a thrust disc, the space is saved, and the mechanical property requirement is reduced.
The second shaft section 32 and the third shaft section 33 are connected by a bevel transition to reduce internal stresses between the different shaft sections.
The outer surface of the third shaft section 33 is provided with a radial magnetic bearing rotor component which is connected with the magnetic circuit supporting end of the radial bearing 5; the rotor assembly of the radial magnetic bearing and the stator magnetic field of the radial magnetic bearing 5 form a loop to enable the rotor to be suspended under magnetic force.
The motor shaft 3 further comprises fourth shaft segments 39, the two fourth shaft segments 39 being located outside the two third shaft segments 33, respectively; the outer surface of the fourth shaft section 39 is sleeved with punching sheets which are mutually stacked and attached in the axial direction, and the punching sheets on the fourth shaft section 39 are connected with the sensing end of the axial sensor to detect the axial position of the motor shaft 3.
The motor shaft 3 further comprises a fifth shaft section 30, the two fifth shaft sections 30 are respectively positioned at the outer sides of the two fourth shaft sections 39, and the outer surface of the fifth shaft section 30 is matched with the inner ring of the non-magnetic radial bearing. When the motor is powered off, the magnetic force provided by the radial bearing 5 and the axial bearing 6 disappears, and the motor shaft 3 is supported from falling to a non-magnetic radial bearing position to prevent the motor shaft 3 from being damaged by sudden falling.
The cylindrical outer surface of the fifth shaft section 30 is provided with end face teeth 301, and the end face teeth 301 are matched with the connection part of the impeller. The end face tooth structure 301 and the impeller are automatically centered to transmit torque. The outer side end face of the fifth shaft section 30 is provided with a screw hole, and the impeller is fixed on the screw hole and connected with the motor shaft 3.
Claims (10)
1. A magnetic suspension high-speed asynchronous motor comprises a shell (1), a stator (2), a motor shaft (3), a radial bearing (5) and an axial bearing (6); the motor shaft (3) is characterized by comprising a first shaft section (31), two second shaft sections (32) respectively positioned at the outer sides of two ends of the first shaft section (31) and two third shaft sections (33) respectively positioned at the outer sides of two ends of the second shaft sections (32); a permanent magnet is arranged in the first shaft section (31), a copper-clad layer (34) is arranged on the surface of the first shaft section (31), and the first shaft section (31) is connected with the driving end of the stator (2); the second shaft section (32) and the third shaft section (33) are respectively connected with the supporting end of the axial bearing (6) and the supporting end of the radial bearing (5).
2. A magnetically levitated high-speed asynchronous motor according to claim 1, characterized in that the two second shaft segments (32) and the two third shaft segments (33) are axially symmetrically distributed along the first shaft segment (31).
3. The magnetic levitation high-speed asynchronous machine as claimed in claim 1, characterised in that the copper-clad layer (34) comprises a lower recess (35) in the middle and raised portions (36) on both sides, the lower recess (35) having the same width as the drive end of the stator (2).
4. A magnetic levitation high-speed asynchronous motor as claimed in claim 1, characterised in that the second shaft section (32) has a smaller cylindrical diameter than the first shaft section (31), and that a first shoulder (37) is formed on the outer end surface of the first shaft section (31) at the location where the second shaft section (32) is connected to the first shaft section (31); the cylindrical diameter of the third shaft section (33) is smaller than that of the second shaft section (32), and a second shaft shoulder (38) is formed on the outer end face of the second shaft section (32) at the connecting position of the third shaft section (33) and the second shaft section (32); the first shaft shoulder (37) and the second shaft shoulder (38) are magnetic conduction surfaces, and the first shaft shoulder (37) and the second shaft shoulder (38) are respectively connected with the stator magnetic circuit supporting end of the axial bearing (6).
5. The magnetic levitation high-speed asynchronous machine as claimed in claim 1, characterised in that the second shaft section (32) and the third shaft section (33) are connected by a bevel transition.
6. A magnetically levitated high-speed asynchronous motor according to claim 1, characterized in that the outer surface of the third shaft section (33) is provided with a radial magnetic bearing rotor assembly engaging with the magnetic circuit supporting end of the radial bearing (5).
7. A magnetically levitated high-speed asynchronous motor according to claim 1, characterized in that the motor shaft (3) further comprises fourth shaft segments (39), two of the fourth shaft segments (39) being located outside the two third shaft segments (33), respectively; the outer surface of the fourth shaft section (39) is sleeved with punching sheets which are mutually stacked and attached in the axial direction, and the punching sheets on the fourth shaft section (39) are connected with the induction end of the axial sensor.
8. A magnetically levitated high-speed asynchronous motor according to claim 7, characterized in that the motor shaft (3) further comprises fifth shaft segments (30), the two fifth shaft segments (30) being located outside the two fourth shaft segments (39), respectively, and the outer surface of the fifth shaft segments (30) cooperating with the inner ring of the non-magnetic radial bearing.
9. The magnetic levitation high-speed asynchronous motor as claimed in claim 8, wherein the cylindrical outer surface of the fifth shaft section (30) is provided with end teeth (301), and the end teeth (301) are matched with the connection part of the impeller.
10. The magnetic levitation high-speed asynchronous motor as claimed in claim 8, characterised in that the outer end face of the fifth shaft section (30) is provided with screw holes, and the impeller is fixed on the screw holes and connected with the motor shaft (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110504658.6A CN113315301A (en) | 2021-05-10 | 2021-05-10 | Magnetic suspension high-speed asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110504658.6A CN113315301A (en) | 2021-05-10 | 2021-05-10 | Magnetic suspension high-speed asynchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113315301A true CN113315301A (en) | 2021-08-27 |
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ID=77371809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110504658.6A Pending CN113315301A (en) | 2021-05-10 | 2021-05-10 | Magnetic suspension high-speed asynchronous motor |
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| Country | Link |
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| CN (1) | CN113315301A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118572943A (en) * | 2024-07-31 | 2024-08-30 | 山东天瑞重工有限公司 | Electric suspension self-bearing motor for magnetic suspension rotation |
| CN118646209A (en) * | 2024-08-09 | 2024-09-13 | 杭州昆泰磁悬浮技术有限公司 | Air spinning motor and air spinning machine |
-
2021
- 2021-05-10 CN CN202110504658.6A patent/CN113315301A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118572943A (en) * | 2024-07-31 | 2024-08-30 | 山东天瑞重工有限公司 | Electric suspension self-bearing motor for magnetic suspension rotation |
| CN118646209A (en) * | 2024-08-09 | 2024-09-13 | 杭州昆泰磁悬浮技术有限公司 | Air spinning motor and air spinning machine |
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