CN118300296A - Spoke type permanent magnet synchronous motor - Google Patents
Spoke type permanent magnet synchronous motor Download PDFInfo
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- CN118300296A CN118300296A CN202410719917.0A CN202410719917A CN118300296A CN 118300296 A CN118300296 A CN 118300296A CN 202410719917 A CN202410719917 A CN 202410719917A CN 118300296 A CN118300296 A CN 118300296A
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 45
- 238000004804 winding Methods 0.000 claims description 130
- 239000003822 epoxy resin Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 229920000647 polyepoxide Polymers 0.000 claims description 11
- 239000004809 Teflon Substances 0.000 claims description 8
- 229920006362 Teflon® Polymers 0.000 claims description 8
- 230000000670 limiting effect Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 238000004382 potting Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 19
- 230000008569 process Effects 0.000 description 19
- 230000005389 magnetism Effects 0.000 description 8
- 230000005415 magnetization Effects 0.000 description 7
- 125000006850 spacer group Chemical group 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910001172 neodymium magnet Inorganic materials 0.000 description 5
- 229910000976 Electrical steel Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
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- 230000002829 reductive effect Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
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- 238000005538 encapsulation Methods 0.000 description 3
- 230000017105 transposition Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000005288 electromagnetic effect Effects 0.000 description 2
- 210000001503 joint Anatomy 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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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
- H02K1/22—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
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- 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
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- 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
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
本申请公开了一种轮辐式永磁同步电机，该轮辐式永磁同步电机包括电机壳体、定子和转子，定子固定设置于电机壳体的内壁上；转子位于电机壳体内，并穿设于定子围绕的空间，转子包括转子铁心、磁体转轴和充磁组件，转子铁心套设于转轴上，并与转轴保持相对固定，转子铁心包括围绕转轴的周向分布的多个容纳腔，磁体位于容纳腔内，磁体为无磁性的硬磁体，充磁组件位于转子铁心和转轴之间，充磁组件与转子铁心、充磁组件与转轴均抵接，充磁组件还与转轴固定连接，充磁组件用于接收电流以产生用于为磁体充磁的充磁磁场。通过上述设置，提高了轮辐式永磁同步电机的装配性能。
The present application discloses a spoke-type permanent magnet synchronous motor, which includes a motor housing, a stator and a rotor, wherein the stator is fixedly arranged on the inner wall of the motor housing; the rotor is located in the motor housing and penetrates the space surrounded by the stator, and the rotor includes a rotor core, a magnet shaft and a magnetizing component, wherein the rotor core is sleeved on the shaft and relatively fixed with the shaft, the rotor core includes a plurality of accommodating cavities distributed circumferentially around the shaft, the magnet is located in the accommodating cavity, the magnet is a non-magnetic hard magnet, the magnetizing component is located between the rotor core and the shaft, the magnetizing component is in contact with the rotor core, the magnetizing component is in contact with the shaft, the magnetizing component is also fixedly connected with the shaft, and the magnetizing component is used to receive current to generate a magnetizing magnetic field for magnetizing the magnet. Through the above arrangement, the assembly performance of the spoke-type permanent magnet synchronous motor is improved.
Description
Technical Field
The application relates to the technical field of motors, in particular to a spoke type permanent magnet synchronous motor.
Background
The spoke type permanent magnet synchronous motor is a common permanent magnet synchronous motor, has the characteristics of high salient pole ratio and high magnetic focusing effect, and has the outstanding advantages of high reluctance torque, low cost, high power density and the like, so that the spoke type permanent magnet synchronous motor is widely applied.
The assembly mode of the spoke type permanent magnet synchronous motor in the prior art is that firstly, a magnet of the motor is assembled with a rotor of the motor, and then, the magnet of the spoke type permanent magnet synchronous motor in the prior art is assembled with a stator of the motor, and as the magnet of the spoke type permanent magnet synchronous motor in the prior art is usually a permanent magnet with magnetism when leaving a factory, a larger electromagnetic effect exists between the magnet and other motor components in the assembly process of the spoke type permanent magnet synchronous motor; in order to reduce the interference of electromagnetic action on the motor assembly process, the conventional assembly mode needs to be assisted by a special tool, so that the defects of complex assembly, long time consumption, easiness in component damage and the like are caused, and the assembly process is difficult.
Disclosure of Invention
In order to solve the defects in the prior art, the application aims to provide the spoke type permanent magnet synchronous motor with good assembly performance.
In order to achieve the above purpose, the present application adopts the following technical scheme:
A spoke-type permanent magnet synchronous motor, the spoke-type permanent magnet synchronous motor comprising: a motor housing; the stator is fixedly arranged on the inner wall of the motor shell; the rotor is positioned in the motor shell and penetrates through the space surrounded by the stator, the rotor comprises a rotor core, a magnet and a rotating shaft, the rotor core is sleeved on the rotating shaft and is kept relatively fixed with the rotating shaft, the rotor core comprises a plurality of accommodating cavities distributed around the circumference of the rotating shaft, and the magnet is positioned in the accommodating cavities; the rotor also comprises a magnetizing component, wherein the magnetizing component is positioned between the rotor iron core and the rotating shaft, the magnetizing component is in butt joint with the rotor iron core and the rotating shaft, and is fixedly connected with the rotating shaft, and the magnetizing component is used for receiving current to generate a magnetizing magnetic field for magnetizing the magnet.
Further, the magnetizing assembly comprises a plurality of cushion blocks and magnetizing windings, the cushion blocks are located between the rotor iron core and the rotating shaft, the cushion blocks are in butt joint with the rotor iron core and the rotating shaft, the cushion blocks are fixedly connected with the rotating shaft, the cushion blocks are distributed around the circumference of the rotating shaft, an axial preset straight line perpendicular to the rotating shaft is defined, the cushion blocks are symmetrical relative to the center of the preset straight line, and the magnetizing windings are wound on the cushion blocks around the extending direction of the preset straight line.
Further, the number of the magnetizing windings is equal to the number of the cushion blocks, the number of the cushion blocks and the number of the magnets, and each magnetizing winding is wound on each cushion block.
Further, the magnetizing assembly further comprises a fixing bolt, and the fixing bolt penetrates through the rotor core, the cushion block and the rotating shaft, so that the rotor core and the cushion block are kept relatively fixed.
Further, in the radial direction of the rotating shaft, the magnetizing winding and at least part of the magnet overlap.
Further, the length of the magnetizing winding in the axial direction of the rotating shaft is greater than or equal to the length of the magnet in the axial direction of the rotating shaft.
Further, a limiting part extending along the tangential direction of the rotating shaft is formed on the cushion block, and the limiting part is abutted with the magnet in the radial direction of the rotating shaft so as to limit the radial movement of the magnet along the rotating shaft.
Further, the cushion block is made of teflon material, and the magnetizing winding is fixedly connected with the cushion block in an epoxy resin encapsulation mode.
Further, the magnetizing winding is of a multi-layer coil structure.
Further, when the magnetizing assembly magnetizes the magnet, a magnetism isolating plate is arranged in an air gap between the stator and the rotor core.
According to the spoke type permanent magnet synchronous motor, the non-magnetic magnet is arranged, so that a large electromagnetic effect is avoided between the magnet and other motor components in the assembly process of the spoke type permanent magnet synchronous motor, and the assembly performance of the spoke type permanent magnet synchronous motor is improved.
Drawings
Fig. 1 is a schematic structural diagram of a spoke type permanent magnet synchronous motor according to an embodiment of the present application;
FIG. 2 is an enlarged view of FIG. 1 at A in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of the magnetic field of a magnetizing winding in an embodiment of the application;
FIG. 4 is a schematic view of a fixing bolt according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a magnetizing winding according to an embodiment of the present application;
FIG. 6 is a schematic diagram of the relationship between the remanence after magnetizing the magnet and the magnetic field strength of the externally applied magnetizing field in an embodiment of the present application;
fig. 7 is a schematic diagram of the relationship between the saturation of magnetization of a magnet and the current of the magnetization winding in an embodiment of the application.
Detailed Description
In order to make the present application better understood by those skilled in the art, the technical solutions in the specific embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application.
As shown in fig. 1, the present application provides a spoke type permanent magnet synchronous motor 100, the spoke type permanent magnet synchronous motor 100 includes a motor housing 11, a stator 12 and a rotor 13, both the stator 12 and the rotor 13 are located in the motor housing 11, and the motor housing 11 can protect the stator 12 and the rotor 13 inside. The stator 12 is located on the inner wall of the motor housing 11 and fixedly connected with the inner wall of the motor housing 11. The rotor 13 is surrounded by the stator 12, and the rotor 13 penetrates through a space formed by the stator 12.
As shown in fig. 2, the stator 12 includes a stator core 121 and a stator winding 122, the stator core 121 is fixedly disposed on an inner wall of the motor housing 11, the stator winding 122 is wound on the stator core 121, and the stator winding 122 is connected to an external power source, so that the stator winding 122 can receive the power of the power source to generate an alternating magnetic field, wherein the stator core 121 has a hollow cylindrical shape, and the stator core 121 is formed by stacking a plurality of silicon steel sheets.
The rotor 13 includes a rotor core 131, a rotating shaft 132, a magnet 133 and a magnetizing assembly 135, the rotor core 131 is hollow cylindrical, the rotating shaft 132 is cylindrical, the rotor core 131 is sleeved on the rotating shaft 132 and fixedly connected with the rotating shaft 132, and the rotor core 131 and the rotating shaft 132 can be kept relatively fixed. The rotor core 131 is formed by stacking a plurality of silicon steel sheets, bolts penetrate through the plurality of silicon steel sheets to fix the plurality of silicon steel sheets into a whole, the rotating shaft 132 comprises a shaft body and a rotor support frame sleeved on the shaft body, the shaft body is fixedly connected with the rotor support frame, and the rotor core 131 is sleeved on the rotor support frame and is fixedly connected with the rotor support frame through the bolts. A plurality of accommodating chambers 134 are formed in the rotor core 131, the plurality of accommodating chambers 134 are distributed around the circumference of the rotating shaft 132, and the magnets 133 are positioned in the accommodating chambers 134 so that the magnets 133 can be distributed around the circumference of the rotating shaft 132. Since the magnet 133 is a non-magnetic hard magnet 133, the magnet 133 does not electromagnetically interact with the rotor core 131, the shaft 132, and the like.
The magnetizing assembly 135 is located between the rotor core 131 and the rotating shaft 132, the magnetizing assembly 135 is abutted to the rotor core 131, the magnetizing assembly 135 is fixedly connected to the rotating shaft 132, and the magnetizing assembly 135 is used for receiving current to generate a magnetizing magnetic field for magnetizing the magnet 133. After the spoke type permanent magnet synchronous motor 100 is assembled, the magnetizing assembly 135 is connected to an external magnetizing apparatus. The magnetizing capacitor is arranged in the magnetizing apparatus, the magnetizing apparatus generates magnetizing voltage and current by discharging through the magnetizing capacitor, and the magnetizing assembly 135 can receive the current output by the magnetizing apparatus to generate a magnetizing magnetic field with a specific amplitude pulse. Since the magnet 133 is located in the accommodating cavity 134 in the rotor core 131, the magnet 133 receives the magnetizing field of the specific amplitude pulse generated by the magnetizing assembly 135, and thus the magnetizing assembly 135 can magnetize the magnet 133. In the embodiment of the present application, the magnet 133 is a hard magnet 133, so after the magnet 133 is magnetized by the magnetizing assembly 135, if the magnetizing apparatus stops outputting the current to the magnetizing assembly 135, that is, the magnetic field generated by the magnetizing assembly 135 disappears, the magnet 133 can still keep magnetic property, and thus the magnetic field generated by the magnet 133 can be coupled with the magnetic field generated by the stator winding 122 during the use of the spoke type permanent magnet synchronous motor 100, so as to drive the rotation shaft 132 to rotate.
The magnet in the prior art has magnetism before the spoke type permanent magnet synchronous motor is assembled, so that the magnet can generate electromagnetic action with the rotor core and the rotating shaft, and the assembly difficulty between the magnet and the rotor core is improved. In addition, after the magnet and the rotor core are assembled, the magnet and the stator core also have electromagnetic action, so that the assembly between the rotor and the stator is difficult, and the assembly difficulty of the spoke type permanent magnet synchronous motor is improved. The magnet 133 provided in the embodiment of the application has no magnetism before the spoke type permanent magnet synchronous motor 100 is assembled, so that the magnet 133 does not have electromagnetic action with the rotor core 131, the rotating shaft 132, the stator core 121 and other parts, namely, the magnet 133 does not generate larger magnetic force with the rotor core 131, the rotating shaft 132, the stator core 121 and other parts in the assembly process of the spoke type permanent magnet synchronous motor 100, thereby reducing the assembly difficulty of the spoke type permanent magnet synchronous motor 100.
Specifically, the magnetizing assembly 135 includes a plurality of spacer blocks 1351 and magnetizing windings 1352, the spacer blocks 1351 are located between the rotor core 131 and the rotating shaft 132, the spacer blocks 1351 are all abutted to the rotor core 131, the spacer blocks 1351 are fixedly connected with the rotating shaft 132 and circumferentially distributed around the rotating shaft 132, and the spacer blocks 1351 are fixedly connected with the rotating shaft 132, wherein the spacer blocks 1351 are basically rectangular. Defining a preset straight line 101 perpendicular to the axial direction of the rotating shaft 132, the cushion block 1351 is centrally symmetrical with respect to the preset straight line 101, the magnetizing winding 1352 is wound on the cushion block 1351 around the extending direction of the preset straight line 101, and the magnetizing winding 1352 and at least part of the magnet 133 overlap along the radial direction of the rotating shaft 132. In the case where the magnetizing winding 1352 is connected to an external magnetizing machine and receives the current of the magnetizing machine, the magnetizing winding 1352 can generate a magnetic field coupled to each other, and since the magnetizing winding 1352 is located between adjacent pads 1351 and at least part of the magnetizing winding 1352 and the magnet 133 are overlapped in the radial direction of the rotating shaft 132, the magnet 133 receives a magnetic field in the tangential direction of the rotating shaft 132, and thus the magnet 133 can be magnetized to saturation in the tangential direction of the rotating shaft 132. The length of the magnetizing winding 1352 extending along the axial direction of the rotating shaft 132 is greater than or equal to the length of the magnet 133 extending along the axial direction of the rotating shaft 132, so that the magnet 133 can be located in the magnetic field generated by the magnetizing winding 1352, and the magnetizing winding 1352 can magnetize the whole magnet 133 at the same time.
In the embodiment of the present application, the number of the magnetizing windings 1352 is also a plurality, the number of the magnetizing windings 1352 is equal to the number of the pads 1351, the number of the pads 1351 is equal to the number of the magnets 133, and each magnetizing winding 1352 is wound on each pad 1351. When any magnet 133 is magnetized, the corresponding magnetizing windings 1352 of the magnet 133 are reversely connected in series, and the serially connected magnetizing windings 1352 are connected to the magnetizer, the magnetizing windings 1352 can receive current output by the magnetizer and generate magnetic fields which are coupled with each other, so that the magnet 133 is magnetized tangentially, and all the magnets 133 can be magnetized by repeating the above operations. It can be appreciated that, compared to only one magnetizing winding 1352 being provided and one magnetizing winding 1352 being wound on all the pads 1351 to magnetize all the magnets 133 simultaneously by using one magnetizing winding 1352, in the embodiment of the present application, one magnetizing winding 1352 is wound on each pad 1351 and one single magnet 133 is magnetized by using the corresponding magnetizing winding 1352 of the single magnet 133, so that the capacitance and magnetizing voltage of the magnetizing capacitor required when the magnet 133 is magnetized to saturation are reduced, and the magnetizing process of the magnet 133 is simpler.
In addition, in the use process of the spoke type permanent magnet synchronous motor 100, if the magnetism of one magnet 133 is found to be weakened, the magnetizing windings 1352 corresponding to the magnet 133 are connected in reverse series and connected to the magnetizer, the magnetizing windings 1352 can receive the current output by the magnetizer to generate a magnetizing field with a specific amplitude pulse, and the magnetizing windings 1352 can magnetize the magnet 133 with weakened magnetism by using the magnetizing field with the specific amplitude pulse.
As shown in fig. 2, as an implementation, the spoke-type permanent magnet synchronous motor 100 further includes a magnetic shield 200, and the magnetic shield 200 is located in an air gap between the stator 12 and the rotor 13. In the embodiment of the application, the magnetism isolating plate 200 is an aluminum plate which is non-magnetic and has a fan-shaped section, and the magnetism isolating plate 200 is placed in an air gap between the stator 12 and the rotor 13 at a position corresponding to the magnetized magnet 133 in the magnetizing process of the magnet 133, so that a magnetizing magnetic field generated by the magnetizing winding 1352 is prevented from entering the stator 12 through the air gap, the leakage of the magnetizing magnetic field is reduced, and the magnetizing effect of the magnetizing winding 1352 is improved.
It should be noted that, after the magnet 133 is magnetized, the magnetic isolation plate 200 needs to be taken out from the air gap, so that the magnetic isolation plate 200 is prevented from interfering with the coupling of the magnetic field between the stator 12 and the rotor 13, thereby preventing the normal operation of the spoke type permanent magnet synchronous motor 100 from being affected.
As shown in fig. 2, the magnetizing process of any one magnet 133 is described in detail, and the magnetizing process of the other magnets 133 is not described herein. Specifically, the magnet 133 includes an un-magnetized magnet 1331, the magnetized winding 1352 includes a first winding 1352a and a second winding 1352b, the pad 1351 includes a first pad 1351a and a second pad 1351b, the first pad 1351a and the second pad 1351b each extend along a radial direction of the rotation shaft 132 when viewed from an axial direction of the rotation shaft 132, and a length of the first winding 1352a extending along the axial direction of the rotation shaft 132 and a length of the second winding 1352b extending along the axial direction of the rotation shaft 132 are both greater than or equal to a length of the un-magnetized magnet 1331 extending along the axial direction of the rotation shaft 132. The first winding 1352a is wound on the first pad 1351a, the first winding 1352a is distributed around the radial direction of the rotating shaft 132, the second winding 1352b is wound on the second pad 1351b, and the second winding 1352b is distributed around the radial direction of the rotating shaft 132; along the radial direction of the rotation shaft 132, the first winding 1352a overlaps at least a portion of the non-magnetized magnet 1331, and the second winding 1352b overlaps at least a portion of the non-magnetized magnet 1331. In the magnetizing process of the non-magnetized magnet 1331, the first winding 1352a and the second winding 1352b are connected in series in an opposite direction, and the first winding 1352a and the second winding 1352b are connected to an external magnetizing machine, and because the first winding 1352a and the second winding 1352b are connected in series in an opposite direction, the magnetizing field generated by the first winding 1352a and the magnetizing field generated by the second winding 1352b are opposite to each other, and the magnetizing field generated by the first winding 1352a and the magnetizing field generated by the second winding 1352b are mutually coupled and are the non-magnetized magnet 1331, so that the magnetizing is performed along the tangential direction of the rotating shaft 132.
As shown in FIG. 3, embodiments of the present application also provide a simulated view of the un-magnetized magnet 1331 during magnetization. From the simulation, the magnetizing field generated by the first winding 1352a and the magnetizing field generated by the second winding 1352b can be coupled to each other, and magnetize the non-magnetized winding 1352 along the tangential direction of the rotation shaft 132.
As shown in fig. 4, further, the magnetizing assembly 135 further includes a fixing bolt 1353, and the fixing bolt 1353 is inserted through the rotor core 131, the pad 1351 and the rotating shaft 132 to fix the rotor core 131 and the pad 1351 on the rotating shaft 132, so that the rotor core 131 and the pad 1351 remain relatively fixed. Since magnet 133 is located in receiving cavity 134 within rotor core 131 and magnetizing winding 1352 is wound around pad 1351, rotor core 131 and pad 1351 remain relatively fixed, i.e., the position between magnet 133 and magnetizing winding 1352 remains relatively fixed. Through the arrangement, the position between the magnet 133 and the magnetizing winding 1352 in the magnetizing process can be prevented from being changed, and the influence on the magnetizing direction of the magnet 133 due to the change of the relative position between the magnet 133 and the magnetizing winding 1352 is prevented, so that the accuracy of magnetizing the magnet 133 is improved.
As shown in fig. 4, as an implementation manner, a limit portion 1351c extending along a tangential direction of the rotating shaft 132 is formed on the pad 1351, and the limit portion 1351c abuts against the magnet 133 along a radial direction of the rotating shaft 132 during the assembly process of the spoke type permanent magnet synchronous motor 100 and after the assembly process of the spoke type permanent magnet synchronous motor 100 is completed. In the embodiment of the present application, in order to facilitate the assembly between the magnet 133 and the rotor core 131, the volume of the receiving chamber 134 in the rotor core 131 is larger than the volume of the magnet 133, and thus the magnet 133 can be directly placed in the receiving chamber 134 formed in the rotor core 131 and is in clearance fit with the receiving chamber 134, which results in that the magnet 133 can be moved in the receiving chamber 134 with respect to the rotor core 131, thereby affecting the stability of the magnet 133 during magnetizing and the stability during use. By providing the limit portion 1351c abutting against the magnet 133 in the radial direction of the rotation shaft 132, the movement of the magnet 133 in the radial direction of the rotation shaft 132 can be restricted, thereby improving the stability of the magnet 133 in the magnetizing process and the stability in the use process.
As shown in fig. 5, as one implementation, magnetizing winding 1352 is a multi-layer coil structure. Illustratively, the magnetizing winding 1352 employs a 4mm by 1.7mm flat copper wire, the number of turns of the magnetizing winding 1352 is 28 turns, and the magnetizing winding 1352 is configured as a double-layer coil structure including an inner coil and an outer coil, wherein the number of turns of the inner coil and the number of turns of the outer coil are both 14 turns. The magnetizing winding 1352 adopts a winding transposition arrangement mode, namely after the 14 turns of the inner coil are wound, the 1 st turn of the 14 turns of the outer coil is close to the 1 st turn of the inner coil to start winding, so that the initial end and the tail end of the coil are further separated. The magnetizing winding 1352 adopts a winding transposition arrangement mode, so that the inter-turn voltage of the magnetizing winding 1352 is reduced, damage to the magnetizing winding 1352 caused by the over-high inter-turn voltage is avoided, and the service life of the magnetizing winding 1352 is prolonged.
It is understood that the magnetizing winding 1352 may be configured as a 3-layer or 4-layer coil structure, and the magnetizing winding 1352 arranged in a winding transposition arrangement is within the scope of the present application.
As one implementation, the magnetizing winding 1352 is fixedly connected to the pad 1351 by way of epoxy encapsulation. Specifically, after the magnetizing winding 1352 is wound on the cushion block 1351, epoxy resin is filled in gaps between the magnetizing winding 1352 and the cushion block 1351 by filling the epoxy resin on the magnetizing winding 1352 and the cushion block 1351, the magnetizing winding 1352 and the cushion block 1351 can be fixed after the epoxy resin is solidified, and further the position of the magnetizing winding 1352 of the magnet 133 is prevented from being changed in the magnetizing process, so that the magnetizing direction of the magnet 133 is prevented from being influenced due to the change of the position of the magnetizing winding 1352, and the accuracy of the magnet 133 in magnetizing is improved.
In addition, because the epoxy resin has no conductivity, the epoxy resin is encapsulated on the magnetizing winding 1352 and can isolate the adjacent coils on the magnetizing winding 1352, so that the adjacent coils on the magnetizing winding 1352 are prevented from being contacted, and further, the adjacent coils on the magnetizing winding 1352 are prevented from being short-circuited when the magnetizing winding 1352 is magnetized, and therefore the safety of the magnetizing winding 1352 is improved. Because the magnetizing windings 1352 have high-amplitude current flowing through the magnetizing windings 1352 in the magnetizing process, electromagnetic force is generated on the magnetizing windings 1352, and electromagnetic force between the magnetizing windings 1352 drives the magnetizing windings 1352 to expand, so that the magnetizing windings 1352 are damaged, the mechanical performance of the magnetizing windings 1352 is further enhanced by the epoxy resin, and the safety of the magnetizing windings 1352 is improved. It should be noted that, during the encapsulation of the epoxy resin, the limit portion 1351c on the pad 1351 also can prevent the epoxy resin near the magnetizing winding 1352 from entering the accommodating cavity 134 on the rotor core 131, so that the assembling of the magnet 133 is difficult due to the epoxy resin in the accommodating cavity 134, and the assembling property of the magnet 133 is improved.
As an implementation manner, the material of the cushion block 1351 is a teflon material, that is, the cushion block 1351 is made of polytetrafluoroethylene, and the teflon material has the characteristics of low conductivity, heat resistance and no magnetic conduction, and the material of the cushion block 1351 with the characteristics is within the protection scope required by the application. Because conductivity of the teflon material is low, the cushion block 1351 is made of the teflon material, so that eddy currents generated in the cushion block 1351 due to the suddenly-changed external magnetic field during magnetizing of the magnet 133 can be avoided, weakening of the magnetizing magnetic field by the eddy current magnetic field is avoided, and magnetizing effect of the magnet 133 is guaranteed. In addition, since the magnetizing winding 1352 receives the current transmitted by the magnetizing machine during magnetizing, the magnetizing winding 1352 generates larger heat, and the cushion block 1351 is prevented from being damaged due to overhigh heat of the magnetizing winding 1352 by setting the cushion block 1351 to be made of a heat-resistant teflon material, so that the service life of the cushion block 1351 is prolonged.
It should be noted that, in the embodiment of the present application, the magnetizing assembly 135 is still placed in the spoke type permanent magnet synchronous motor 100 after the magnetizing of the magnet 133 is completed. In the use process of the spoke type permanent magnet synchronous motor 100, the magnetic field generated by the magnet 133 is coupled with the magnetic field generated by the stator winding 122, and the cushion block 1351 is made of a non-magnetic-conductive teflon material, so that the magnetic field generated by the magnet 133 can be prevented from entering the cushion block 1351, and the magnetic leakage of the magnet 133 is reduced, so that the performance of the magnet 133 is improved.
In the embodiment of the present application, the magnet 133 is configured as a neodymium-iron-boron magnet, and as shown in fig. 6, the magnetization curve of the neodymium-iron-boron magnet is shown in the abscissa indicating the magnetic field strength of the magnetization magnetic field generated by the magnetization winding 1352, and the ordinate indicating the remanence after the magnetization of the magnet 133. As can be seen in fig. 6, the magnet 133 reaches saturation when the magnet 133 is magnetized to 1600kA/m by the magnetizing field applied by the magnetizing winding 1352. In the embodiment of the application, 4mm flat copper wires with the length of 1.7mm are adopted as the magnetizing winding 1352, so that the maximum bearing current of the magnetizing winding 1352 is 15kA. Fig. 7 shows a curve between the saturation level of the magnet 133 and the current of the magnetizing winding 1352, and the abscissa shows the current in the magnetizing winding 1352 and the ordinate shows the saturation level of the magnet 133. As can be seen from fig. 7, as the current on the magnetizing winding 1352 increases, the saturation level of the neodymium-iron-boron magnet increases, and when the current on the magnetizing winding 1352 is 10kA, the neodymium-iron-boron magnet is magnetized to saturation, i.e. the magnetic field strength of the neodymium-iron-boron magnet reaches 1600kA/m, and at this time, the current on the magnetizing winding 1352 is lower than the maximum load current of the magnetizing winding 1352. As can be seen from the above simulation data, the present application provides a magnetizing winding 1352 that is capable of magnetizing the magnet 133 to saturation within its maximum load current.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (10)
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| CN202410719917.0A CN118300296A (en) | 2024-06-05 | 2024-06-05 | Spoke type permanent magnet synchronous motor |
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| CN202410719917.0A CN118300296A (en) | 2024-06-05 | 2024-06-05 | Spoke type permanent magnet synchronous motor |
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