CN110601390A - Permanent magnet motor - Google Patents
Permanent magnet motor Download PDFInfo
- Publication number
- CN110601390A CN110601390A CN201910926650.1A CN201910926650A CN110601390A CN 110601390 A CN110601390 A CN 110601390A CN 201910926650 A CN201910926650 A CN 201910926650A CN 110601390 A CN110601390 A CN 110601390A
- Authority
- CN
- China
- Prior art keywords
- motor
- permanent magnet
- stator
- core
- stator core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004804 winding Methods 0.000 claims abstract description 25
- 239000002826 coolant Substances 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000696 magnetic material Substances 0.000 claims abstract description 8
- 230000009467 reduction Effects 0.000 claims abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000001816 cooling Methods 0.000 abstract description 8
- 230000006872 improvement Effects 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
-
- 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]
-
- 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
- H02K1/278—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/02—Windings characterised by the conductor material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Motor Or Generator Cooling System (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a permanent magnet motor, which comprises a stator core and a plurality of stator coil windings embedded and wound on the stator core; the stator core is made of amorphous soft magnetic material; and a channel for cooling medium to circulate is arranged in the lead of any stator coil winding to realize temperature reduction. The stator core is made of amorphous soft magnetic materials, so that the iron loss of the motor can be reduced, and the efficiency of the motor is improved; in addition, along with the improvement of the frequency and the rotating speed of the motor, the working environment in the motor is more severe, and the risk of overhigh temperature is very easy to exist; and the conducting wire of the stator coil winding is used as a cooling channel of the motor, so that the space in the motor is not additionally occupied, the size of the permanent magnet motor is controlled, and the light weight of the motor is realized.
Description
Technical Field
The invention relates to the field of motors, in particular to a permanent magnet motor.
Background
With the maturity of intelligent power electronic technology, the electric aviation technology is rapidly developed, wherein the driving motor of the electric aircraft is a key technology. Due to the special working environment, the driving motor has the technical characteristics of light weight, low speed, large torque, wide speed regulation range and the like. Therefore, how to realize the technology of small-sized high-speed high-power density driving motors becomes a bottleneck for restricting the development of small and medium-sized electric aircrafts.
Disclosure of Invention
The invention aims to provide a permanent magnet motor which is suitable for small and medium-sized electric aircrafts and has the characteristics of high speed, small volume and high power density.
In order to achieve the above object, the present invention provides a permanent magnet motor, comprising a stator core and a plurality of stator coil windings embedded around the stator core; the stator core is made of amorphous soft magnetic material; and a channel for cooling medium to circulate is arranged in the lead of any stator coil winding to realize temperature reduction.
Preferably, the channel is disposed in a middle portion of the wire and extends in a length direction of the wire.
Preferably, all the wires are embodied as flat copper wires.
Preferably, the permanent magnet motor further comprises a rotor core arranged in the stator core in a penetrating way and a plurality of permanent magnets arranged in the rotor core; all the permanent magnets are attached and fixed on the surface of the rotor iron core.
Preferably, the permanent magnet binding device further comprises a sleeve which is sleeved between the stator core and the rotor core and used for fixing all the permanent magnets, and a fixing part which is arranged in the sleeve and used for binding all the permanent magnets; the sleeve is made of non-magnetic-conductive alloy.
Preferably, the fixing portion is made of carbon fiber.
Preferably, the permanent magnet generator further comprises a plurality of permanent magnets arranged on the rotor iron core; and a plurality of grooves for embedding all the permanent magnets to realize fixation are arranged in the rotor iron core.
Preferably, the stator coil winding comprises a stator winding, a stator winding and a stator winding, wherein the stator winding comprises a stator core and a stator winding, and the stator winding comprises a stator winding and a stator winding.
Compared with the prior art, the stator core of the permanent magnet motor provided by the invention adopts the amorphous soft magnetic material so as to reduce the iron loss of the motor and improve the efficiency of the motor; in addition, compared with other motors, the motor made of the amorphous soft magnetic material has higher frequency and rotation speed, and has high torque during high-speed operation. And along with the improvement of the frequency and the rotating speed of the motor, the working environment in the motor is more harsh, and the risk of overhigh temperature easily exists. On one hand, the cooling medium in the channel can cool the permanent magnet motor in operation, so that the temperature of the motor is relatively constant when the motor runs at high speed and high power density; on the other hand, the conducting wire of the stator coil winding is used as a cooling channel of the motor, so that the internal space of the motor is efficiently utilized, the size of the permanent magnet motor can be further reduced, and the motor is light.
In summary, the permanent magnet motor improves the rotating speed and the power density, and simultaneously considers the problem of temperature limitation caused by overhigh rotating speed of the motor, so as to respectively improve the rotating speed and the power density to achieve the purposes of reducing the volume and improving the rotating speed and the power density.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a permanent magnet motor according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a lead of a first permanent magnet motor according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of a conductor of a second permanent magnet machine according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a rotor according to an embodiment of the present invention;
the motor comprises a stator core 1, a stator core 2, a lead 3, a cooling medium 4, an electric gap 5, a sleeve 6, a fixing part 7, a permanent magnet 8, a motor shell 8 and a rotor core 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a permanent magnet motor according to an embodiment of the present invention; fig. 2 is a cross-sectional view of a lead of a first permanent magnet motor according to an embodiment of the present invention; fig. 3 is a cross-sectional view of a conductor of a second permanent magnet machine according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of a rotor according to an embodiment of the present invention.
Referring to fig. 1, the present invention provides a permanent magnet motor, which includes a stator core 1 and a plurality of stator coil windings embedded around the stator core 1.
The stator core 1 is made of amorphous soft magnetic materials, such as iron-based amorphous alloy and iron-nickel-based amorphous alloy, the loss of the amorphous soft magnetic materials is superior to that of silicon steel, the frequency characteristic and the temperature stability of the motor can be improved, and the rotating speed of the motor can be improved; meanwhile, the conducting wire 2 of the stator coil winding provided by the invention is internally provided with a channel for the cooling medium 3 to circulate so as to achieve the purpose of cooling the motor, when the temperature in the motor rises due to the increase of the speed of the motor, the cooling medium 3 can constantly keep heat exchange with the motor so as to reduce the temperature of the motor, and the channel for the circulation of the cooling medium 3 is arranged in the conducting wire 2 and does not occupy the internal space of the motor additionally, so that the increase of the volume of the motor is avoided.
The cooling medium 3 can be air or cooling liquid, in other words, the permanent magnet motor can adopt air cooling or liquid cooling; obviously, in order to realize the circulation supply of the cooling medium 3 in the lead 2, the permanent magnet motor is further provided with a supply device for storing and circulating the cooling medium 3, the supply device can be arranged inside the motor casing 8, and also can be arranged outside the motor casing 8 and connected to the lead 2 in the motor casing 8 through a pipeline, and the specific arrangement mode of the supply device can refer to the related arrangement in the prior art.
The permanent magnet motor provided by the invention is further described below with reference to the accompanying drawings and embodiments.
Considering that the conducting wires 2 of the stator coil winding are small in diameter and long in length, the channel is preferably arranged in the middle of the conducting wires 2 and extends along the length direction of the conducting wires 2, that is, one channel is arranged in any conducting wire 2, and the central axis of the channel coincides with the central axis of the conducting wires 2, so that not only can the heat conductivity of each part of the conducting wires 2 be ensured to be equivalent, but also the strength of each part of the conducting wires 2 can be ensured to be balanced, and the conducting wires 2 are prevented from being broken in the stretching process. Of course, the number of passages in any one of the wires 2 is not limited to one, and the central axis of the passage is not limited to coincide with the central axis of the wire 2, and other hollow wires capable of achieving cooling of the stator core 1 may be used as an alternative to the aforementioned wires 2.
The following description will be given taking two specific arrangements of the wires 2 as an example.
Referring to fig. 1 and 2, the lead 2 of the first permanent magnet motor and the channel in the lead 2 are both cylindrical, for example, hollow round copper wires; the distance between the channel in the hollow round copper wire and the outer wall of the hollow round copper wire is equal, and the hollow round copper wire has better structural strength.
Please refer to fig. 1 and fig. 3, the wire 2 of the second permanent magnet motor provided by the present application is an elliptical wire, and more specifically, the cross section of the wire 2 is an ellipse, or a rectangle with rounded corners at four corners, and the shape of the channel disposed in the elliptical wire is not limited, which can be set to a circle to reduce the difficulty of the channel, or to an ellipse which is similar to the cross section of the elliptical wire but has a smaller size, at this time, when the wire 2 is attached to the stator core 1, the contact area between the wire 2 and the stator core 1 is larger, thereby increasing the contact area between the cooling medium 3 in the wire 2 and the stator core 1, and the cooling effect is better.
In addition to the hollow structure of the lead wires 2 for introducing the cooling medium 3 into the lead wires 2 to cool the stator, the cooling medium 3 can be introduced between the electric gaps 4 in the permanent magnet motor to further improve the cooling effect.
On the basis of the above embodiment, the stator further comprises a rotor core 9 penetrating the stator core 1 and a plurality of permanent magnets 7 arranged on the rotor core 9, and all the permanent magnets 7 can be attached to the periphery of the rotor core 9 to realize fixation.
Preferably, the permanent magnet motor further comprises a sleeve 5 sleeved between the stator core 1 and the rotor core 9 and a fixing part 6 arranged in the sleeve 5 and used for binding all the permanent magnets 7; in this embodiment, all the permanent magnets 7 are distributed between the inner wall of the sleeve 5 and the outer wall of the rotor core 9, that is, all the permanent magnets 7 are fixed to the rotor core 9 by using the binding of the fixing portion 6 and the assembly between the inner wall of the sleeve 5 and the outer wall of the rotor core 9, and this arrangement can avoid the transformation of the rotor core 9, and the number of the permanent magnets 7 is less affected by the volume of the rotor core 9.
Wherein, the material of the fixing portion 6 can be carbon fiber. The carbon fiber has high strength, small density and small thermal expansion coefficient, and can ensure the connection performance of all the permanent magnets 7 and the rotor iron core 9 in the high-speed running process of the motor.
Of course, in addition to fixing the permanent magnet 7 by using the sleeve 5 and the fixing portion 6, a plurality of grooves may be provided in the rotor core 9, the grooves being circumferentially distributed around the central axis of the rotor core 9 and being used for embedding the permanent magnet 7 to fix the permanent magnet 7. Besides being circumferentially distributed by taking the central shaft of the rotor core 9 as the center, the plurality of grooves can be arranged in a layered manner along the radial direction of the rotor core 9, so that the number of the permanent magnets 7 which can be accommodated in one rotor core 9 is increased, and the reluctance torque density is further increased. Obviously, the size of the plurality of permanent magnets 7 layered in the same radial direction of rotor core 9 varies with the radial size of rotor core 9, and specifically, the volume of permanent magnet 7 near the center of rotor core 9 is larger than the volume of permanent magnet 7 far from the center of rotor core 9, so that the space in rotor core 9 is utilized as fully as possible to increase the total volume of all permanent magnets 7.
On the basis of any one of the above embodiments, the permanent magnet motor provided by the present application further includes a pole-changing device connected to all the stator coil windings for changing the direction of the pole group of some of the stator coil windings. The pole-changing device can change the pole of the motor, such as 12 poles to 10 poles, 16 poles to 14 poles, etc., by changing the direction of the pole group of part of the stator coil winding, and the operation aims to start the motor with a large pole number and run the motor at a high speed with a small pole number, so that the power density of the permanent magnet motor during normal operation can be greatly improved. The specific arrangement of the pole-changing device can refer to the related arrangement in the prior art.
The permanent magnet motor provided by the invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A permanent magnet motor is characterized by comprising a stator core (1) and a plurality of stator coil windings embedded and wound on the stator core (1); the stator core (1) is made of amorphous soft magnetic material; and a channel for circulating a cooling medium to realize temperature reduction is arranged in the lead (2) of any stator coil winding.
2. A permanent magnet machine according to claim 1, characterized in that the channel is arranged in the middle of the wire (2) and extends in the length direction of the wire (2).
3. A permanent magnet machine according to claim 2, characterized in that all the wires (2) are embodied as flat copper wires.
4. The permanent magnet motor according to claim 2, further comprising a rotor core (9) arranged in the stator core (1) and a plurality of permanent magnets (7) arranged in the rotor core (9); and all the permanent magnets (7) are attached and fixed on the surface of the rotor iron core (9).
5. The permanent magnet motor according to claim 4, further comprising a sleeve (5) sleeved between the stator core (1) and the rotor core (9) for fixing all the permanent magnets (7) and a fixing part (6) arranged in the sleeve (5) for binding all the permanent magnets (7); the sleeve (5) is made of non-magnetic-conductive alloy.
6. A permanent magnet machine according to claim 5, characterized in that the material of the fixing part (6) is carbon fiber.
7. A permanent magnet machine according to claim 4, characterized by a plurality of permanent magnets (7) arranged in the rotor core (9); and a plurality of grooves for embedding all the permanent magnets (7) to realize fixation are arranged in the rotor iron core (9).
8. The permanent magnet motor according to any one of claims 1 to 7, further comprising pole changing means connected to all of said stator coil windings for changing the direction of the pole group of part of said stator coil windings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926650.1A CN110601390B (en) | 2019-09-27 | 2019-09-27 | Permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910926650.1A CN110601390B (en) | 2019-09-27 | 2019-09-27 | Permanent magnet motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110601390A true CN110601390A (en) | 2019-12-20 |
| CN110601390B CN110601390B (en) | 2024-10-18 |
Family
ID=68864368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910926650.1A Active CN110601390B (en) | 2019-09-27 | 2019-09-27 | Permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110601390B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474485A (en) * | 2019-07-17 | 2019-11-19 | 南京师范大学 | A kind of high-speed motor cooling system |
| CN111478474A (en) * | 2020-06-01 | 2020-07-31 | 苏州英磁新能源科技有限公司 | Motor rotor for radial cylinder type permanent magnet synchronous motor and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800456A (en) * | 2009-02-11 | 2010-08-11 | 深圳华任兴科技有限公司 | Method for preparing amorphous alloy stator core by using modular mode |
| CN202353329U (en) * | 2011-09-09 | 2012-07-25 | 山东大学威海分校 | Stator core |
| CN203674939U (en) * | 2013-11-18 | 2014-06-25 | 北京前沿新锐电机技术有限公司 | Superhigh-efficiency permanent magnet motor |
| CN106130199A (en) * | 2016-05-31 | 2016-11-16 | 辽宁通用航空研究院 | New iron-based non-crystaline amorphous metal aircraft permanent magnet synchronous motor and control system |
| CN107659005A (en) * | 2017-09-30 | 2018-02-02 | 上海英磁新能源科技有限公司 | A kind of disc type superconducting motor |
| CN107872121A (en) * | 2017-06-30 | 2018-04-03 | 广东合新材料研究院有限公司 | Magnet coil cooling system |
| CN210468916U (en) * | 2019-09-27 | 2020-05-05 | 卧龙电气(上海)中央研究院有限公司 | Permanent magnet motor |
-
2019
- 2019-09-27 CN CN201910926650.1A patent/CN110601390B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101800456A (en) * | 2009-02-11 | 2010-08-11 | 深圳华任兴科技有限公司 | Method for preparing amorphous alloy stator core by using modular mode |
| CN202353329U (en) * | 2011-09-09 | 2012-07-25 | 山东大学威海分校 | Stator core |
| CN203674939U (en) * | 2013-11-18 | 2014-06-25 | 北京前沿新锐电机技术有限公司 | Superhigh-efficiency permanent magnet motor |
| CN106130199A (en) * | 2016-05-31 | 2016-11-16 | 辽宁通用航空研究院 | New iron-based non-crystaline amorphous metal aircraft permanent magnet synchronous motor and control system |
| CN107872121A (en) * | 2017-06-30 | 2018-04-03 | 广东合新材料研究院有限公司 | Magnet coil cooling system |
| CN107659005A (en) * | 2017-09-30 | 2018-02-02 | 上海英磁新能源科技有限公司 | A kind of disc type superconducting motor |
| CN210468916U (en) * | 2019-09-27 | 2020-05-05 | 卧龙电气(上海)中央研究院有限公司 | Permanent magnet motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474485A (en) * | 2019-07-17 | 2019-11-19 | 南京师范大学 | A kind of high-speed motor cooling system |
| CN111478474A (en) * | 2020-06-01 | 2020-07-31 | 苏州英磁新能源科技有限公司 | Motor rotor for radial cylinder type permanent magnet synchronous motor and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110601390B (en) | 2024-10-18 |
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