CN110829658A - Rotor of self-starting permanent magnet synchronous motor - Google Patents
Rotor of self-starting permanent magnet synchronous motor Download PDFInfo
- Publication number
- CN110829658A CN110829658A CN201911299331.9A CN201911299331A CN110829658A CN 110829658 A CN110829658 A CN 110829658A CN 201911299331 A CN201911299331 A CN 201911299331A CN 110829658 A CN110829658 A CN 110829658A
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- Prior art keywords
- rotor
- grooves
- self
- permanent magnet
- synchronous motor
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a rotor of a self-starting permanent magnet synchronous motor, which comprises a rotor punching sheet, wherein a plurality of V-shaped grooves are formed in the rotor punching sheet around the circumference, and reinforcing ribs are arranged at the sharp corners of the V-shaped grooves and divide the V-shaped grooves into two symmetrically arranged sub-grooves; the sub-grooves comprise magnetic steel grooves and air grooves which are arranged at two ends of the magnetic steel grooves and communicated with the magnetic steel grooves; the rotor also comprises a ventilation groove plate, the ventilation groove plate is provided with a groove hole which is consistent with the rotor punching sheet in shape and is provided with the same size and position as the rotor punching sheet, and a plurality of ventilation groove sheets which are radially arranged are welded on the ventilation groove plate around the circumference. On the basis of ensuring the performance requirement of the motor, the punching sheet is prevented from deforming due to insufficient strength, and on the basis, the ventilation groove is added to improve the ventilation and heat dissipation effects of the rotor.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a rotor of a self-starting permanent magnet synchronous motor.
Background
Environmental problems and energy crisis become main obstacles hindering social progress and economic development, the department of energy sources adopts the popularization and use of high-efficiency motors as the national important measures for saving electric energy, and the self-starting permanent magnet synchronous motor has the advantages of high efficiency and high power factor and also has the self-starting function, the comprehensive electricity saving rate reaches 4% -20%, and the national energy-saving requirements and market demands are met.
The rotor of the self-starting permanent magnet synchronous motor mostly adopts a laminated rotor structure, the eddy current in the iron core is less, the loss is low, and the ventilation duct can be added in the iron core section to improve the heat dissipation effect. However, the laminated rotor adopts a permanent magnet built-in rotor structure, and the type of rotor punching sheet is provided with a damping groove and a magnetic steel groove, so that the arrangement space of the rotor punching sheet is very short, the laminated punching sheet is thin, a magnetic isolation bridge is required to be arranged between the magnetic steel grooves, and the mechanical strength of the punching sheet is required to be ensured at the moment.
In a rotor punching sheet used in a self-starting permanent magnet synchronous motor in the prior art, a magnetic steel groove is in a W shape, a bar is added in the middle of the W-shaped magnetic steel groove to increase the mechanical strength of the punching sheet, but the number of the bars is not too large or too wide, the magnetic leakage of the magnetic steel is easy to be serious, and the existing punching sheet can only be used in a permanent magnet synchronous motor with a small number of poles. For a multi-pole permanent magnet synchronous motor, the punching sheet adopting the structure needs a plurality of W-shaped magnetic steel grooves, the mechanical strength of the punching sheet is weakened due to the large number of the magnetic steel grooves and the reinforcing ribs, and the utilization rate of permanent magnet materials is too low to meet the design requirement.
Disclosure of Invention
The invention aims to solve the problems, and provides a rotor of a self-starting permanent magnet synchronous motor, which prevents punching sheets from deforming due to insufficient strength on the basis of ensuring the performance requirement of the motor, and increases ventilation grooves on the basis to improve the ventilation and heat dissipation effects of the rotor.
In order to realize the purpose, the invention adopts the technical scheme that: a rotor of a self-starting permanent magnet synchronous motor comprises a rotor punching sheet, wherein a plurality of V-shaped grooves are formed in the rotor punching sheet around the circumference, reinforcing ribs are arranged at the sharp corners of the V-shaped grooves, and the V-shaped grooves are divided into two symmetrically arranged sub-grooves by the reinforcing ribs; the sub-grooves comprise magnetic steel grooves and air grooves which are arranged at two ends of the magnetic steel grooves and communicated with the magnetic steel grooves.
Further, the outer contour of the air groove is set to be curved.
Furthermore, the width of the reinforcing rib is 2 mm-5 mm.
Furthermore, the rotor also comprises a ventilation groove plate, the ventilation groove plate is provided with a groove hole which is consistent with the rotor punching sheet in shape and is provided with the same size and position as the rotor punching sheet, and a plurality of radial ventilation groove sheets are welded on the ventilation groove plate around the circumference.
Furthermore, the height of the ventilation slot pieces is the same, the ventilation slot pieces are different in length and are uniformly distributed on the board surface according to a certain interval, and a wind path channel is formed between every two adjacent ventilation slot pieces which are arranged in parallel in the radial direction.
The invention has the beneficial effects that:
1. the invention can enhance the mechanical strength of the punching sheet under the condition of meeting the self-starting requirement of the laminated rotor, can also place enough magnetic steel to improve the electromagnetic performance of the permanent magnet synchronous motor, and meets the requirement of high efficiency and high power factor of the high-voltage synchronous motor.
2. The invention is provided with the air groove, thereby reducing the leakage magnetic flux.
3. The ventilation slot plates and the ventilation slot sheets are made of stainless steel non-magnetic materials, so that the generation of leakage magnetic flux in the slot plates is inhibited, the ventilation effect of the rotor is improved, the temperature of the magnetic steel is reduced, and the demagnetization phenomenon cannot occur.
4. The rotor of the invention has low manufacturing cost and simple processing.
Drawings
Fig. 1 is a front view of a rotor sheet according to the present invention.
Fig. 2 is a front view of a rotor core of the present invention.
Fig. 3 is a front view of the vent groove plate of the present invention.
Fig. 4 is a schematic cross-sectional view of a rotor according to the present invention.
Fig. 5 is a schematic perspective view of the present invention.
In the figure: 1. rotor punching sheets; 2. magnetic steel; 3. a vent slot plate; 4. a stainless steel end plate; 5. a damping strip; 6. an end ring; 7. an inner fan; 8. a copper bar; 9. a transition rib; 10. a solid shaft; 11. a damping slot; 12. a magnetic steel groove; 13. an air tank; 14. reinforcing ribs; 31. and (4) ventilating slot sheets.
Detailed Description
The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.
As shown in fig. 1 to 5, the present invention provides a rotor structure of a self-starting permanent magnet synchronous motor, which is specifically applied to a high-voltage high-efficiency self-starting permanent magnet synchronous motor with multiple poles, and the structure specifically comprises: the rotor punching sheet comprises a rotor punching sheet 1, magnetic steel 2, a stainless steel end plate 4, a ventilation groove plate 3, a damping strip 5, an end ring 6 and an inner fan 7; the rotor sheet 1 adopts the structure of FIG. 1, a plurality of V-shaped grooves are arranged on the rotor sheet 1 around the circumference, in order to prevent the sharp corners of the V-shaped grooves from forming a closed magnetic field, two air grooves 13 are arranged at the positions, the mechanical strength of the rotor sheet 1 is weakened due to the increase of the air grooves 13, a reinforcing rib 14 needs to be added between the two air grooves 13, the width of the reinforcing rib 14 is 2-5 mm, the selection of the width of the reinforcing rib 14 depends on the inner and outer diameters of the rotor sheet 1, the magnetic flux leakage condition of the magnetic steel 2 during the design of an electromagnetic scheme, and whether the mechanical strength of the rotor sheet 1 meets the design requirements; the V-shaped groove is divided into two symmetrically arranged sub-grooves by the reinforcing rib 14; the sub-slots comprise magnetic steel slots 12 and air slots which are arranged at two ends of the magnetic steel slots 13 and communicated with the magnetic steel slots 13, wherein the magnetic steel slots 12 are rectangular, and the air slots 13 are used for preventing the magnetic flux of the magnetic steel 2 from passing through air gaps and flowing to other areas to cut off a magnetic circuit; the contour of the air groove 13 is set to be in a curve shape, so that the edge of the air groove is designed to be a streamline curved surface, a sharp angle is not formed near the magnetic steel 2 on the W-shaped rotor punching sheet, a small part of leakage magnetic field magnetic circuit flowing through between the rotor damping strip 5 and the air groove 13 is smooth, a harmonic magnetic field is weakened, leakage reactance is reduced, the utilization rate of embedded magnetic steel of the self-starting permanent magnet synchronous motor is improved, torque fluctuation is reduced, and the influence of the magnetic steel on the tooth space torque of the stator is weakened.
Further, be provided with magnet steel 2 in the magnet steel groove 12, this magnet steel 2 is the cuboid, the cross-section is less than magnet steel groove 12 a little, make by high-quality tombarthite neodymium iron boron permanent magnet material, magnet steel 2 mounting surface has two holes, when installation magnet steel 2, instil into a drop in the downthehole 480 in magnet steel 2 one side, insert copper bar 8 downthehole to magnet steel 2 again, solidification more than 2 minutes, and keep copper bar 8 perpendicular to magnet steel 2's terminal surface, at this moment, press into magnet steel 2 in magnet steel groove 12 with magnet steel 2 mounting process frock, and push magnet steel 2 in place with the assembly handle, it is with the N, S utmost points of distinguishing the magnet steel that need write the sign well on stainless steel end plate 4 after a magnet steel groove 12 installation is accomplished.
Furthermore, damping strips 5 are uniformly distributed on the rotor around the circumference, the damping strips 5 are rectangular, are installed in a damping groove 11 in the figure 1 and are wedged tightly, the end faces of two ends of each damping strip 5 are firmly welded with end rings 6, the end rings 6 are similar to the end rings of an asynchronous motor, and form a permanent magnet synchronous motor starting cage structure together for directly starting the self-starting permanent magnet synchronous motor.
Further, the rotor sheets 1 are stacked on the rotor core, each stacked section is provided with a plurality of ventilation groove plates 3 at intervals, the shape of the ventilation groove plates 3 is as shown in fig. 3, the ventilation groove plates 3 are provided with groove holes which are consistent with the shape of the rotor sheets 1 and are provided with the same size and position as those of the rotor sheets 1, and a plurality of radial ventilation groove sheets 31 are welded on the ventilation groove plates 3 around the circumference; the plurality of ventilation slot pieces 31 are the same in height and different in length, are uniformly distributed on the plate surface at certain intervals, and an air path channel is formed between every two adjacent ventilation slot pieces 31 which are arranged in parallel in the radial direction; after the rotor punching sheet 1 is stacked on the rotor core, the stainless steel end plates 4 are mounted at two ends of the rotor punching sheet, the stacked rotor punching sheet 1 and the ventilation groove plate 3 are compressed, and then the tensioning screw penetrates through the ventilation groove plate 3 and the mounting hole positions arranged on the rotor punching sheet 1 to be fixed.
The concrete heat dissipation mode is as shown in fig. 4, rotor pivot 10 is solid axle, transition muscle 9 has evenly been arranged on solid axle 10, form the axial wind channel between transition muscle 9 and the transition muscle 9, fan 7 is installed respectively to the terminal surface both sides, fan 7 fixes on rotor pivot 10, the wind path is got into by both sides fan 7, the wind path passes through transition muscle 9 and then gets into in rotor core's the radial air duct, through the space between transition muscle 9, by the radial air duct outflow of rotor, the effectual heat dissipation problem that improves the rotor, magnet steel 2's temperature has been reduced.
Claims (5)
1. A rotor of a self-starting permanent magnet synchronous motor comprises a rotor punching sheet and is characterized in that a plurality of V-shaped grooves are formed in the rotor punching sheet around the circumference, reinforcing ribs are arranged at the sharp corners of the V-shaped grooves, and the V-shaped grooves are divided into two symmetrically arranged sub-grooves by the reinforcing ribs; the sub-grooves comprise magnetic steel grooves and air grooves which are arranged at two ends of the magnetic steel grooves and communicated with the magnetic steel grooves.
2. The rotor of a self-starting permanent magnet synchronous motor according to claim 1, wherein the air slots are arranged in a curved shape in outer profile.
3. The rotor of a self-starting permanent magnet synchronous motor according to claim 1, wherein the width of the reinforcing rib is 2mm to 5 mm.
4. The rotor of the self-starting permanent magnet synchronous motor according to any one of claims 1 to 3, characterized in that the rotor further comprises a ventilation groove plate, the ventilation groove plate is provided with a groove hole which is consistent with the shape of the rotor sheet and is provided with the same size and position as the rotor sheet, and a plurality of ventilation groove sheets which are arranged radially are welded on the ventilation groove plate around the circumference.
5. The rotor of a self-starting PMSM according to claim 4, wherein said air slots are of the same height, different lengths and evenly distributed over the plate surface at regular intervals, and an air passage is formed between two adjacent radially arranged air slots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911299331.9A CN110829658A (en) | 2019-12-17 | 2019-12-17 | Rotor of self-starting permanent magnet synchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911299331.9A CN110829658A (en) | 2019-12-17 | 2019-12-17 | Rotor of self-starting permanent magnet synchronous motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110829658A true CN110829658A (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911299331.9A Pending CN110829658A (en) | 2019-12-17 | 2019-12-17 | Rotor of self-starting permanent magnet synchronous motor |
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| Country | Link |
|---|---|
| CN (1) | CN110829658A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478471A (en) * | 2020-05-12 | 2020-07-31 | 宁德时代电机科技有限公司 | High-efficiency high-bearing unbalanced load permanent magnet synchronous generator device |
-
2019
- 2019-12-17 CN CN201911299331.9A patent/CN110829658A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111478471A (en) * | 2020-05-12 | 2020-07-31 | 宁德时代电机科技有限公司 | High-efficiency high-bearing unbalanced load permanent magnet synchronous generator device |
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