CN219833858U - Permanent magnet motor and cooling device thereof - Google Patents
Permanent magnet motor and cooling device thereof Download PDFInfo
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- CN219833858U CN219833858U CN202320276187.2U CN202320276187U CN219833858U CN 219833858 U CN219833858 U CN 219833858U CN 202320276187 U CN202320276187 U CN 202320276187U CN 219833858 U CN219833858 U CN 219833858U
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- permanent magnet
- open cavity
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- magnet motor
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- 238000001816 cooling Methods 0.000 title claims abstract description 50
- 238000004080 punching Methods 0.000 claims abstract description 41
- 238000003475 lamination Methods 0.000 claims 1
- 238000004804 winding Methods 0.000 abstract description 10
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Cooling System (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The utility model provides a permanent magnet motor and a cooling device of the permanent magnet motor, wherein the permanent magnet motor comprises: a rotor, a stator, and a coil winding, the rotor comprising: the rotary shaft, the plurality of punching sheets and the plurality of pairs of permanent magnets are arranged on the punching sheets, and each pair of permanent magnets is arranged in each pair of the placing grooves; gaps are reserved between the permanent magnets and the inner wall of the placing groove, and all the gaps form a first channel after being stacked; the rotating shaft is provided with a first open cavity and a second open cavity communicated with the first open cavity; the punching sheet is also provided with a second channel which is communicated with the first channel and the second open cavity. According to the utility model, the first channel and the second channel which are communicated with the first open cavity and the second open cavity are arranged on the punching sheet, so that the cooling oil entering the first open cavity of the rotating shaft can flow into the rotor core formed by the punching sheet through the second open cavity, the second channel and the first channel, thereby directly cooling the permanent magnet, improving the cooling efficiency of the permanent magnet, effectively reducing the working temperature of the permanent magnet, and improving the output performance and the operation safety of the permanent magnet.
Description
Technical Field
The utility model relates to the technical field of motor cooling, in particular to a permanent magnet motor and a cooling device of the permanent magnet motor.
Background
The permanent magnet synchronous motor has the characteristics of high efficiency and high power density, and is widely applied to the field of electric automobiles. The rotor of the permanent magnet synchronous motor is provided with magnetic field energy by the permanent magnet, however, the output characteristic of the permanent magnet is obviously influenced by the working temperature, the higher the temperature is, the smaller the output magnetic moment of the permanent magnet is, and the smaller the coercive force is, so that the output torque of the permanent magnet synchronous motor and the anti-demagnetization capability of the permanent magnet can be influenced, and further the power output and the running safety of a vehicle are influenced.
At present, the motor generally cools the rotor shaft by passing cooling oil into the shaft to cool the rotor core, and finally indirectly cools the rotor permanent magnet, but the indirect cooling mode of the permanent magnet has lower cooling efficiency.
Disclosure of Invention
The utility model aims to provide a permanent magnet motor and a cooling device of the permanent magnet motor, which are used for solving the problem of low cooling efficiency of the conventional indirect cooling permanent magnet.
In order to solve the above technical problems, the present utility model provides a permanent magnet motor, including: the rotor and stator, rotor rotationally cover is located in the stator, wherein, the rotor includes: the rotary shaft, the punching sheets and the permanent magnets are sleeved on the rotary shaft in a stacked manner, a plurality of pairs of placing grooves are formed in each punching sheet, and each pair of permanent magnets is correspondingly arranged in each pair of placing grooves;
a certain gap is reserved between the permanent magnet and the inner wall of the placing groove, and the gap on each punching sheet is stacked to form a first channel;
the rotary shaft is provided with a first open cavity and a second open cavity communicated with the first open cavity, the first open cavity is arranged along the axial direction of the rotary shaft, and the second open cavity is arranged along the radial direction of the rotary shaft;
the punching sheet is provided with a second channel communicated with the first channel and the second open cavity, and the second channel is arranged along the radial direction of the punching sheet.
Optionally, in the permanent magnet motor, a first limiting portion and a second limiting portion opposite to the first limiting portion are disposed on an inner wall of each of the placement grooves, and the first limiting portion and the second limiting portion are both in contact with the permanent magnet to fix the permanent magnet in the placement groove.
Optionally, in the permanent magnet motor, the second limiting portion is serrated.
Optionally, in the permanent magnet motor, the number of the second open cavities is greater than or equal to 1.
Optionally, in the permanent magnet motor, when the number of the second open cavities is 1, the second open cavities penetrate through the axis of the rotating shaft.
Optionally, in the permanent magnet motor, when the number of the second open cavities is greater than 1, the second open cavities are arranged parallel to the axial direction of the rotating shaft at intervals.
Optionally, in the permanent magnet motor, the length of the first open cavity is smaller than or equal to the length of the rotating shaft.
Optionally, in the permanent magnet motor, one end of the first open cavity is disposed on the surface of the head end of the rotating shaft, and the other end of the first open cavity is communicated with the second open cavity near the tail end of the rotating shaft.
Optionally, in the permanent magnet motor, the second channel is coaxial with the second open cavity.
Optionally, in the permanent magnet motor, two adjacent punching sheets are oppositely provided with grooves which are communicated with the first channel and the second open cavity, and the two grooves form the second channel after being stacked.
Optionally, in the permanent magnet motor, the second channel is provided in a single one of the punching sheets.
Optionally, in the permanent magnet motor, each pair of permanent magnets has a splayed shape, and a splayed opening of the permanent magnets faces the stator.
Correspondingly, the utility model also provides a cooling device of the permanent magnet motor, which comprises: the balancing disc is sleeved on the rotating shaft of the permanent magnet motor and positioned at two ends of the stacked punching sheets of the permanent magnet motor, a plurality of mutually communicated through holes are formed in the balancing disc, and at least part of the through holes are communicated with the first channel of the punching sheets.
The technical scheme of the utility model at least comprises the following advantages:
according to the utility model, the first channel and the second channel which are communicated with the first open cavity of the rotating shaft and the second open cavity of the rotating shaft are arranged on the punching sheet, so that cooling oil entering the first open cavity of the rotating shaft can flow into the rotor core formed by the punching sheet through the second open cavity, the second channel and the first channel, thereby directly cooling the permanent magnet, improving the cooling efficiency of the permanent magnet, effectively reducing the working temperature of the permanent magnet, and improving the output performance and the operation safety of the permanent magnet motor.
Furthermore, through the plurality of through holes which are communicated with each other and the first channels of the punching sheets are arranged on the balance disc, the cooling oil entering the first open cavity of the rotating shaft can flow into the rotor core (along the axial direction) formed by the punching sheets through the second open cavity, the second channels and the first channels, finally, the cooling oil is thrown out of the rotor through the through holes on the balance disc, and the thrown cooling oil can contact and cool the coil windings encircling on the convex parts of the stator, so that the heat of the coil windings is taken away, the working temperature of the permanent magnet motor is effectively reduced, and the output performance and the operation safety of the permanent magnet motor are further improved.
Drawings
FIG. 1 is a top view of a permanent magnet motor according to an embodiment of the present utility model;
FIG. 2 is a partial top view of a punch according to an embodiment of the present utility model;
FIG. 3 is an axial cross-sectional view of a cooling apparatus for a permanent magnet motor according to an embodiment of the present utility model;
wherein reference numerals are as follows:
11-rotating shaft, 111-first open cavity, 112-second open cavity, 12-punching sheet, 121-first channel, 122-second channel, 13-permanent magnet, 14-placing groove, 15-first limit part, 16-second limit part, 17-gap, 18-groove, 20-stator, 21-protruding part and 30-balance disc.
Detailed Description
The permanent magnet motor and the cooling device of the permanent magnet motor provided by the utility model are further described in detail below with reference to the accompanying drawings and the specific embodiments. The advantages and features of the present utility model will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the utility model. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.
An embodiment of the present utility model provides a permanent magnet motor, referring to fig. 1, fig. 1 is a top view of the permanent magnet motor according to the embodiment of the present utility model, the permanent magnet motor includes: a rotor and a stator 20, the rotor is rotatably sleeved in the stator 20, wherein the rotor comprises: the rotary shaft 11, a plurality of punching sheets 12 and a plurality of pairs of permanent magnets 13, wherein the punching sheets 12 are sleeved on the rotary shaft 11 in a stacking manner, a plurality of pairs of placing grooves 14 are formed in each punching sheet 12, and each pair of permanent magnets 13 is correspondingly arranged in each pair of placing grooves 14. The stacked punched sheets 12 constitute a rotor core.
Referring to fig. 2 and 3, fig. 2 is a partial top view of a punching sheet according to an embodiment of the present utility model, and fig. 3 is a cross-sectional view of a cooling device of a permanent magnet motor according to an embodiment of the present utility model along an axial direction, a certain gap 17 is left between the permanent magnet 13 and an inner wall of the placement groove 14, and the gaps 17 on each punching sheet 12 are stacked to form a first channel 121.
Further, the rotating shaft 11 is provided with a first open cavity 111 and a second open cavity 112 communicated with the first open cavity 111, the first open cavity 111 is arranged along the axial direction of the rotating shaft 11, and the second open cavity 112 is arranged along the radial direction of the rotating shaft 111.
Further, the punch 12 is provided with a second channel 122 communicating the first channel 121 and the second open cavity 112, and the second channel 122 is disposed along the radial direction of the punch 12.
Preferably, a first limiting portion 15 and a second limiting portion 16 opposite to the first limiting portion 15 are disposed on an inner wall of each of the placement grooves 14, and the first limiting portion 15 and the second limiting portion 16 are both in contact with the permanent magnet 13 to fix the permanent magnet 13 in the placement groove 14.
Preferably, the second limiting portion 16 is in a zigzag shape, and in this embodiment, the second limiting portion 16 on the inner wall of the placement groove 14 may have at least two zigzag shapes.
Further, the number of the second open cavities 112 is greater than or equal to 1.
When the number of the second open cavities 112 is 1, the second open cavities 112 penetrate through the axis of the rotating shaft 11.
When the number of the second open cavities 112 is greater than 1, the second open cavities 112 are disposed parallel to the axial direction of the rotating shaft 11 at intervals, and preferably, the second open cavities 112 may be disposed parallel to the axial direction of the rotating shaft at uniform intervals. In this embodiment, as shown in fig. 3, the number of the second open cavities 112 is 3.
Preferably, the length of the first open cavity 111 is less than or equal to the length of the rotating shaft 11. In this embodiment, the length of the first open cavity 111 is smaller than the length of the rotating shaft 11.
Preferably, one end of the first open cavity 111 is disposed on the surface of the head end of the rotating shaft 11, and the other end of the first open cavity 111 is communicated with the second open cavity 112 near the tail end of the rotating shaft 11.
In the present embodiment, the end of the second passage 122 (the second passage 122 near the second open chamber 112) which is disposed in the same radial direction of the rotation shaft 111 and communicates with each other is coaxial with the second open chamber 112.
In this embodiment, grooves communicating the first channels 121 and the second open cavities 112 are oppositely disposed on two adjacent punching sheets 12, the two grooves 18 are stacked to form the second channels 122, and the ends of the grooves 18 near each pair of the placement grooves 14 form a bifurcation so as to lead to the two placement grooves 14, so as to form a Y-shape.
In other embodiments, a single one of the die 12 has the second passage 122 therein, the second passage 122 branching near the ends of each pair of the placement grooves 14 to open into both of the placement grooves 14, forming a Y-shape.
As shown in fig. 2, fig. 2 illustrates a one-eighth sector structure of the punched sheet, and it can be seen that each pair of the permanent magnets 13 on the one-eighth sector punched sheet has an eight-shape, and the eight-shape openings of the permanent magnets 13 face the stator 20.
In the utility model, the first channel 121 and the second channel 122 which are communicated with the first open cavity 111 of the rotating shaft 11 and the second open cavity 112 of the rotating shaft 11 are arranged on the punching sheet 12, so that the cooling oil entering the first open cavity 111 of the rotating shaft 11 can flow into the interior of the rotor core formed by the punching sheet 12 through the second open cavity 112, the second channel 122 and the first channel 121, thereby directly cooling the permanent magnet 13, improving the cooling efficiency of the permanent magnet 13, effectively reducing the working temperature of the permanent magnet 13 and improving the output performance and the operation safety of the permanent magnet motor.
Further, the permanent magnet motor may further include: coil windings, which are wound around the protruding portions 21 of the stator (not shown).
Based on the same inventive concept, an embodiment of the present utility model further provides a cooling device of a permanent magnet motor, as shown in fig. 3, where the cooling device of the permanent magnet motor includes: the balancing disc 30 is sleeved on the rotating shaft 11 of the permanent magnet motor and is positioned at two ends of the stacked punching sheets 12 of the permanent magnet motor, a plurality of mutually communicated through holes (not shown) are formed in the balancing disc 30, and at least part of the through holes in the balancing disc 30 are communicated with the first channels 121 of the punching sheets. In this embodiment, the outlet of the through hole may be directed away from the outside of the rotating shaft 11 so that the thrown cooling oil can fall onto the coil winding around the projection 21 of the stator 20.
In this embodiment, the cooling oil enters the first open cavity 111 from the head end of the rotating shaft 11, and passes through the second open cavity 112, the second channel 122 and the first channel 121 to directly enter the (axial) interior of the rotor core formed by the punching sheet. It should be noted that, in the present embodiment, the balance disc 30 on both sides of the punching sheet needs to ensure that some through holes are formed on the balance disc and are communicated with the first channel 121 of the punching sheet, so as to ensure that the cooling oil flowing through the first open cavity 111, the second open cavity 112, the second channel 122 and the first channel 121 can be thrown out of the rotor through the through holes on the balance disc 30, and the thrown cooling oil contacts and cools the coil windings surrounding the protruding portion 21 of the stator 20, thereby taking away the heat of the coil windings.
The cooling device of the permanent magnet motor may further include: the oil pump and the collection container, the collection container is located the bottom of permanent magnet motor, the oil pump with the collection container links to each other, the oil pipe of oil pump with the first open cavity 111 of pivot 11 head end links to each other. In this embodiment, the cooling oil may be dropped from the coil winding to the collecting container at the bottom of the permanent magnet motor, and the cooling oil may be pumped from the collecting container by using the oil pump and sent to the port of the first open cavity 111 at the head end of the rotating shaft 11, so as to realize recycling of the cooling oil.
Preferably, for the permanent magnet motor and the cooling device for the permanent magnet motor provided by the embodiments of the present utility model, the present embodiment further provides a control strategy for cooling the rotor of the permanent magnet motor, where the control strategy is mainly aimed at controlling the flow of cooling oil, and the flow of cooling oil can be dynamically distributed according to the working temperature of the permanent magnet of the rotor, specifically, when the working temperature of the permanent magnet is lower than a preset temperature threshold, the flow of cooling oil of the rotor is zero, that is, when the working temperature of the permanent magnet is lower than the preset temperature threshold, the rotor cooling oil is not introduced into the head end of the rotating shaft 11; when the working temperature of the permanent magnet is higher than the preset temperature threshold, the flow rate of the cooling oil is gradually increased, that is, when the working temperature of the permanent magnet is higher than the preset temperature threshold, rotor cooling oil is introduced into the first open cavity 111 from the head end of the rotating shaft 11, and the flow rate of the cooling oil is gradually increased over time.
According to the utility model, the balance disc is provided with the through holes which are communicated with each other and the first channels of the punching sheets are communicated, so that the cooling oil entering the first open cavity of the rotating shaft can flow into the rotor core (along the axial direction) formed by the punching sheets through the second open cavity, the second channels and the first channels, and finally the cooling oil is thrown out of the rotor through the through holes on the balance disc, and the thrown cooling oil can contact and cool the coil windings encircling the convex parts of the stator, so that the heat of the coil windings is taken away, the working temperature of the permanent magnet motor is effectively reduced, and the output performance and the operation safety of the permanent magnet motor are further improved.
The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.
Claims (13)
1. A permanent magnet motor, comprising: the rotor and stator, rotor rotationally cover is located in the stator, wherein, the rotor includes: the rotary shaft, the punching sheets and the permanent magnets are sleeved on the rotary shaft in a stacked manner, a plurality of pairs of placing grooves are formed in each punching sheet, and each pair of permanent magnets is correspondingly arranged in each pair of placing grooves;
a certain gap is reserved between the permanent magnet and the inner wall of the placing groove, and the gap on each punching sheet is stacked to form a first channel;
the rotary shaft is provided with a first open cavity and a second open cavity communicated with the first open cavity, the first open cavity is arranged along the axial direction of the rotary shaft, and the second open cavity is arranged along the radial direction of the rotary shaft;
the punching sheet is provided with a second channel communicated with the first channel and the second open cavity, and the second channel is arranged along the radial direction of the punching sheet.
2. The permanent magnet motor of claim 1, wherein a first limiting portion and a second limiting portion opposite to the first limiting portion are provided on an inner wall of each of the placement grooves, and the first limiting portion and the second limiting portion are both in contact with the permanent magnet to fix the permanent magnet in the placement groove.
3. The permanent magnet machine of claim 2 wherein the second stop is serrated.
4. The permanent magnet machine of claim 1 wherein the number of second open cavities is greater than or equal to 1.
5. The permanent magnet motor of claim 4 wherein when the number of the second open cavities is 1, the second open cavities penetrate through the shaft center of the rotating shaft.
6. The permanent magnet machine of claim 4 wherein when the number of second open cavities is greater than 1, the second open cavities are spaced apart parallel to the axis of the shaft.
7. The permanent magnet machine of claim 1 wherein the length of the first open cavity is less than or equal to the length of the shaft.
8. The permanent magnet motor of claim 1, wherein one end of the first open cavity is open on the surface of the head end of the rotating shaft, and the other end of the first open cavity is communicated with the second open cavity near the tail end of the rotating shaft.
9. The permanent magnet machine of claim 1 wherein the second passageway is coaxial with the second open cavity.
10. The permanent magnet motor of claim 1 wherein adjacent two of said punched sheets are oppositely provided with grooves communicating said first passage and said second open cavity, and wherein two of said grooves are stacked to form said second passage.
11. A permanent magnet machine according to claim 1 wherein said second passageway is provided in a single one of said laminations.
12. The permanent magnet machine of claim 1 wherein each pair of permanent magnets is splayed and wherein the splayed openings of the permanent magnets face the stator.
13. A cooling device for a permanent magnet motor, comprising: the balancing disc and the permanent magnet motor according to any one of claims 1-12, wherein the balancing disc is sleeved on the rotating shaft of the permanent magnet motor and positioned at two ends of the stacked punching sheets of the permanent magnet motor, a plurality of mutually communicated through holes are formed in the balancing disc, and at least part of the through holes are communicated with the first channel of the punching sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320276187.2U CN219833858U (en) | 2023-02-21 | 2023-02-21 | Permanent magnet motor and cooling device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320276187.2U CN219833858U (en) | 2023-02-21 | 2023-02-21 | Permanent magnet motor and cooling device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219833858U true CN219833858U (en) | 2023-10-13 |
Family
ID=88277402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320276187.2U Active CN219833858U (en) | 2023-02-21 | 2023-02-21 | Permanent magnet motor and cooling device thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219833858U (en) |
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2023
- 2023-02-21 CN CN202320276187.2U patent/CN219833858U/en active Active
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