Permanent magnet motor

Abstract

The invention discloses a permanent magnet motor. The permanent magnet motor comprises a shell, a stator and a rotor, the stator comprises a stator tooth part, a winding coil and a stator yoke part; the stator tooth part is in a ring shape and is made of amorphous alloy, the stator tooth part is provided with a plurality of winding grooves and a plurality of first clamping grooves, and the winding coils are installed in the winding grooves; the stator yoke part is in a ring shape and is made of amorphous alloy, and the stator yoke part sleeves the stator tooth part, so that the inner diameter surface of the stator yoke part covers and seals the opening of the winding groove; the stator yoke part is provided with a plurality of second clamping grooves, and each second clamping groove is matched with the corresponding first clamping groove to form a fixing groove. The fixing piece is located in the fixing groove, and the outer contour of the fixing piece is consistent with the inner contour of the fixing groove, so that the fixing piece can fix the stator yoke part and the stator tooth part, and the stator yoke part and the stator tooth part are relatively fixed. Through the arrangement, the vibration noise of the permanent magnet motor can be reduced, and the material utilization rate is improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a permanent magnet motor. Background Art

[0002] Permanent magnet motors usually include stators, rotors and winding coils. In the prior art, stators made of amorphous alloy materials such as iron-based amorphous alloys have higher magnetic permeability, lower coercive force, higher resistivity and lower energy loss than stators made of traditional silicon steel materials. Therefore, stators made of amorphous alloy materials can reduce the stator loss of the motor, improve the energy utilization rate of the motor and reduce the heat generation of the motor, so that the motor can output higher power.

[0003] The stator is usually provided with core teeth for winding winding coils. However, in the prior art, the core teeth are usually open slot structures, which will lead to uneven distribution of the air gap in the motor, thereby leading to uneven distribution of the magnetic field in the air gap, and further leading to aggravated electromagnetic force pulsation, thereby aggravating the torque pulsation of the rotor, and then causing the rotor vibration to collide with the motor housing, causing the motor to generate noise.

[0004] Secondly, the open slot structure of the core teeth will cause the winding coil to fall off, so the core teeth are usually provided with tooth tips and other structures to prevent the winding coil from falling off the core teeth. However, the shapes of the tooth tips and other structures in the prior art are complex, and the amorphous alloy material is brittle. Therefore, when the stator made of amorphous alloy material is processed into complex shapes such as tooth tips, the amorphous alloy material will be broken, thereby reducing the utilization rate of the amorphous alloy material.

[0005] Therefore, under the premise of using amorphous alloy materials to make permanent magnet motors to improve the output power of permanent magnet motors, how to reduce the vibration noise of the motors and improve the material utilization rate of the motors is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In order to solve the deficiencies of the prior art, the purpose of the present application is to provide a permanent magnet motor, which can reduce the vibration noise of the permanent magnet motor and improve the material utilization rate of the permanent magnet motor.

[0007] To achieve the above objectives, this application adopts the following technical solutions: A permanent magnet motor includes a housing, a stator and a rotor. The stator is fixed in the housing, the rotor is surrounded by a stator tooth portion, and the rotor is rotatably connected to the housing so that the rotor can rotate relative to the stator. The stator includes a stator tooth portion, a winding coil and a stator yoke portion. The stator tooth portion is in a ring shape and is made of an amorphous alloy. The stator tooth portion is provided with a plurality of winding slots and a plurality of first clamping slots. The openings of the winding slots and the openings of the first clamping slots are both located on the outer diameter surface of the stator tooth portion. A first clamping slot is provided between two adjacent winding slots, and a winding slot is provided between two adjacent first clamping slots. The winding coil is installed in the winding slot. The stator yoke is in the shape of a ring and is made of amorphous alloy. The stator yoke is sleeved on the stator teeth so that the inner diameter surface of the stator yoke covers and closes the opening of the winding slot. The stator yoke is provided with a plurality of second snap-in slots. The opening of the second snap-in slot is located on the inner diameter surface of the stator yoke. The opening of each second snap-in slot corresponds to a first snap-in slot. Each second snap-in slot cooperates with the corresponding first snap-in slot to form a fixing slot. The fixing member is located in the fixing slot, and the outer contour of the fixing member is consistent with the inner contour of the fixing slot, so that the fixing member can fix the stator yoke and the stator teeth, and the stator yoke and the stator teeth are relatively fixed. The rotor is surrounded by the stator, and the rotor is rotatably connected to the housing so that the rotor can rotate relative to the stator.

[0008] Further, a section plane perpendicular to the axial direction of the stator tooth is defined, and the section of the fixed slot cut by the section plane is the fixed section. The fixed section is one of a triangle, a quadrilateral, a pentagon, ... an n-gon, where n is an integer greater than 3; or the fixed section is a shape formed by at least one curve and at least one straight line; or the fixed section is a shape formed by at least one curve.

[0009] Furthermore, the bottom of the winding slot extends along a preset plane perpendicular to the radial direction of the stator tooth, the minimum distance between the preset plane and the axis of the stator tooth is the slot pitch, and the ratio of the inner circle radius of the stator tooth to the slot pitch ranges from 0.78 to 0.99.

[0010] Furthermore, a plurality of winding slots and a plurality of first clamping slots are arranged along the axial direction of the stator teeth and penetrate the stator teeth, and a plurality of second clamping slots are arranged along the axial direction of the stator yoke and penetrate the stator yoke.

[0011] Furthermore, the stator also includes a stator shell and two end covers. The stator shell is in a ring shape. The stator shell is sleeved on the stator yoke and has an interference fit with the stator yoke. The two end covers are respectively located at both ends of the stator shell along the axial direction of the stator shell, and the end covers are fixedly connected to the stator shell.

[0012] Furthermore, the stator housing is provided with a plurality of first mounting holes along its circumference, and the plurality of first mounting holes penetrate the stator housing axially along the stator housing, and each end cover is provided with a plurality of second mounting holes matching with the first mounting holes, and the plurality of second mounting holes penetrate the end cover axially along the stator housing, and the stator further comprises a plurality of fasteners, each fastener being provided through a second mounting hole on one of the end covers, a corresponding first mounting hole on the stator housing, and a corresponding second mounting hole on the other end cover, so that the two end covers and the stator housing are fixedly connected. The stator housing is made of aluminum alloy, and the fasteners are bolts made of steel.

[0013] Furthermore, the outer diameter of the stator teeth is substantially consistent with the inner diameter of the stator yoke.

[0014] Furthermore, the rotor includes a first rotating shaft, a second rotating shaft, a permanent magnet, a first sleeve, and a second sleeve. A mounting groove is provided in the first rotating shaft, and an annular groove is provided on the first rotating shaft, and the opening of the annular groove is located on the outer surface of the first rotating shaft. The second rotating shaft is at least partially located in the mounting groove and fixed to the mounting groove; the permanent magnet is provided with a plurality of permanent magnets, the plurality of permanent magnets are in the shape of a fan ring, and the plurality of permanent magnets are distributed in the annular groove along the circumference of the first rotating shaft. The first sleeve is wound on the plurality of permanent magnets. The second sleeve is sleeved on the first sleeve and is interference fit with the first sleeve. The first sleeve is made of amorphous alloy; the second sleeve is made of carbon fiber material.

[0015] Furthermore, the annular groove is consistent with the length of the permanent magnet along the axial direction of the first rotating shaft. The lengths of the first sleeve and the second sleeve along the axial direction of the first rotating shaft are greater than the length of the annular groove along the axial direction of the first rotating shaft.

[0016] Furthermore, the second rotating shaft is provided with a plurality of weight-reducing grooves, which are evenly distributed on the outer diameter surface of the second rotating shaft along the circumference of the second rotating shaft, and the openings of the plurality of weight-reducing grooves face the first rotating shaft.

[0017] Furthermore, the two ends of the first rotating shaft along its axial direction are defined as a first section and a second section respectively, and the length of the first section along the axial direction of the first rotating shaft is consistent with the length of the second section along the axial direction of the first rotating shaft; the volume of the first section is greater than the volume of the second section, or an extension piece is provided on the first section for increasing the volume of the first section, and the extension piece is fixed on the first section or integrally formed with the first section.

[0018] The winding slots of the above-mentioned permanent magnet motor can cooperate with the stator yoke to form a closed slot structure, which is conducive to a more uniform magnetic field distribution in the air gap, so as to reduce the electromagnetic force pulsation, thereby reducing the torque pulsation of the rotor, and then reducing the vibration noise generated during the operation of the permanent magnet motor. In addition, there is no need to process complex shapes such as tooth tips to prevent the winding coil from falling off, so as to avoid damage to the amorphous alloy material caused by processing complex shapes such as tooth tips, which is conducive to improving the material utilization rate of the permanent magnet motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An exploded schematic diagram of the overall structure of the permanent magnet motor provided in an embodiment of the present application; Figure 2 A schematic structural diagram of a stator of a permanent magnet motor provided in an embodiment of the present application; Figure 3 A schematic diagram of the change in electromagnetic force density of the stator structure of the permanent magnet motor provided in the embodiment of the present application and the traditional stator structure; Figure 4 A schematic diagram of torque variation of a rotor of a permanent magnet motor and a rotor of a conventional stator structure provided in an embodiment of the present application; Figure 5 ERP level waterfall diagram of the permanent magnet motor provided in the embodiment of the present application; Figure 6 The waterfall diagram of ERP level of the motor with traditional stator structure; Figure 7 A schematic diagram of the A-weighted noise change of the permanent magnet motor provided in an embodiment of the present application; Figure 8 A schematic diagram of the A-weighted noise change of a motor with a traditional stator structure; Fig. 9 A schematic structural diagram of a rotor of a permanent magnet motor provided in an embodiment of the present application; Fig.10 A force analysis diagram of the second sheath of the permanent magnet motor provided in an embodiment of the present application; Fig.11 This is a force analysis diagram of the carbon fiber sheath in the motor without adding the amorphous alloy sheath; Fig.12 A schematic structural diagram of the rotor of the permanent magnet motor provided in an embodiment of the present application from another perspective. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the specific implementation manner of the present application will be clearly and completely described below in conjunction with the drawings in the implementation manner of the present application.

[0021] It should be noted that the words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantitative limitation, but indicate the existence of at least one. "Multiple" or "several" means at least two. Unless otherwise specified, words such as "front", "back", "left", "right", "bottom" and / or "top" are only for the convenience of description and are not limited to one position or one spatial orientation. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0022] The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0023] like Figure 1 and Figure 2 As shown, the present application provides a permanent magnet motor 100, which includes a housing 11, a stator 12 and a rotor 13. The housing 11 serves as the basic frame of the permanent magnet motor 100 and is used to support the stator 12 and the rotor 13. The stator 12 is fixed in the housing 11, and the stator 12 is used to generate a rotating magnetic field. The rotor 13 is surrounded by the stator 12, and the rotor 13 is rotatably connected to the housing 11 so that the rotor 13 can rotate relative to the stator 12, and the rotor 13 can cooperate with the rotating magnetic field to generate electromagnetic torque.

[0024] Specifically, the stator 12 includes a stator tooth portion 121, a winding coil 122, a stator yoke portion 123 and a fixing member 124. Among them, the stator tooth portion 121 and the stator yoke portion 123 are both ring-shaped and made of amorphous alloy, and the stator yoke portion 123 is sleeved on the stator tooth portion 121. Exemplarily, the rotor 13 is surrounded by the stator tooth portion 121. The fixing member 124 is used to fix the relative position of the stator tooth portion 121 and the stator yoke portion 123 so that the stator tooth portion 121 and the stator yoke portion 123 can form a stator core. The winding coil 122 is used to cooperate with the stator core to generate a rotating magnetic field.

[0025] Through the above-mentioned arrangement, the stator core can be divided into two independent components, namely the stator tooth portion 121 and the stator yoke portion 123. Therefore, the stator tooth portion 121 and the stator yoke portion 123 can be processed separately on two independent amorphous alloy materials, thereby avoiding processing the entire stator core structure on one amorphous alloy material to cause excessive stress concentration of the amorphous alloy material, and further avoiding damage to the amorphous alloy material due to excessive stress concentration, which is beneficial to improving the material utilization rate of the permanent magnet motor 100 and then reducing the production cost of the stator 12.

[0026] Furthermore, the stator cores are independently arranged, that is, the stator cores are composed of the stator teeth 121 and the stator yoke 123, so that the structural complexity of the stator teeth 121 and the stator yoke 123 can be simplified, thereby reducing the difficulty of processing the stator teeth 121 and the stator yoke 123. Secondly, it can also avoid excessive mechanical stress applied to the amorphous alloy material during processing due to the excessive complexity of the structure of the stator teeth 121 and the stator yoke 123, thereby avoiding excessive stress on the amorphous alloy and reducing the magnetic permeability of the amorphous alloy, which is beneficial to improve the magnetic permeability of the stator teeth 121 and the stator yoke 123, so as to improve the power of the permanent magnet motor 100.

[0027] In addition, since the stator teeth 121 and the stator yoke 123 are both ring-shaped, and multiple ring-shaped structures of different sizes can be processed from the inside out on an amorphous alloy material, multiple ring-shaped structures of different sizes can be processed into stator teeth 121 or stator yokes 123 of different sizes, which is beneficial to improving the material utilization rate of the amorphous alloy, and further beneficial to reducing the production cost of the permanent magnet motor 100.

[0028] Exemplarily, the stator teeth 121 and the stator yoke 123 are both made of an iron-based amorphous alloy. With this configuration, the iron-based amorphous alloy has a higher magnetic permeability and resistivity, and a lower coercive force and energy loss, which is beneficial to reducing the heat generation of the stator 12, and further beneficial to improving the output power of the permanent magnet motor 100. It should be noted that the amorphous alloy is not limited to the iron-based amorphous alloy, and it is only necessary that the amorphous alloy can meet the working requirements of the stator 12.

[0029] In this embodiment, the stator tooth portion 121 is provided with a plurality of winding slots 1211, and the plurality of winding slots 1211 are uniformly arranged along the circumference of the stator tooth portion 121, and the openings of the winding slots 1211 are located on the outer diameter surface of the stator tooth portion 121, and the winding coil 122 is installed in the winding slots 1211. The outer diameter surface refers to the surface formed by the outer wall of the stator tooth portion 121 along the circumference of the stator tooth portion 121.

[0030] Specifically, the stator yoke 123 is sleeved on the stator tooth 121, and the inner diameter surface of the stator yoke 123 covers and closes the opening of the winding slot 1211. The inner diameter surface refers to the surface formed by the inner wall of the stator yoke 123 along the circumference of the stator yoke 123. In this way, the winding slot 1211 can cooperate with the inner diameter surface of the stator yoke 123 to form a closed slot structure. The closed slot structure can prevent the winding coil 122 from falling off from the winding slot 1211. Therefore, there is no need to process complex structures such as tooth tips on the winding slot 1211 to prevent the winding coil 122 from falling off, which is conducive to reducing the structural complexity of the stator 12, so as to avoid processing complex structures such as tooth tips on the stator tooth 121, which leads to local stress concentration and embrittlement of the processing edge of the stator tooth 121, thereby avoiding the fracture of the stator tooth 121 and increasing the cost of amorphous alloy materials, so as to improve the material utilization rate, and then reduce the production cost of the permanent magnet motor 100. Furthermore, the absence of the need to process complex structures such as tooth tips is also beneficial in reducing the difficulty of processing the stator tooth portion 121, thereby simplifying the processing technology of the stator 12, thereby helping to improve the processing efficiency of the stator 12, and facilitating large-scale automated production of the stator 12, thereby helping to improve the overall production efficiency of the permanent magnet motor 100.

[0031] Secondly, the closed slots can be set to avoid the distortion of the air gap structure caused by the setting of the open slot structure, so that the overall structure of the air gap in the permanent magnet motor 100 is smoother, so that the magnetic field distribution in the air gap is more uniform. Therefore, it is possible to avoid the distortion of the air gap structure and the distortion of the magnetic field distribution in the air gap to produce air gap harmonics, and then avoid the generation of air gap harmonics to aggravate the electromagnetic force pulsation, so as to help reduce the torque pulsation of the rotor 13 caused by the electromagnetic force pulsation, and then help reduce the motor vibration caused by the torque pulsation, so as to help reduce the noise generated during the operation of the permanent magnet motor 100. In addition, by reducing the torque pulsation of the rotor 13, it is also beneficial to avoid excessive collision between the rotor 13 and the housing 11, so as to help improve the operating stability of the rotor 13, so as to help improve the service life of the rotor 13, and then help improve the service life of the permanent magnet motor 100.

[0032] In addition, the closed slots can improve the support force between the stator yoke 123 and the winding slots 1211, thereby improving the overall strength of the stator 12, and further improving the structural strength of the stator teeth 121. Such a configuration can avoid the stator teeth 121 being deformed by external forces and electromagnetic forces due to insufficient strength of the stator teeth 121, thereby avoiding deformation of the air gap and distortion of the magnetic field in the air gap, thereby reducing electromagnetic force pulsation, reducing torque pulsation of the rotor 13, and further reducing vibration noise of the permanent magnet motor 100.

[0033] It should be noted that the air gap refers to the space between the stator 12 and the rotor 13 , and the air gap harmonics refer to the space harmonics caused by the magnetic field distortion in the air gap.

[0034] In this embodiment, the stator tooth portion 121 is provided with a first snap-fitting groove 1212, and the stator yoke portion 123 is provided with a second snap-fitting groove 1231. A plurality of the first snap-fitting grooves 1212 and the second snap-fitting grooves 1231 are provided, and the first snap-fitting grooves 1212 are uniformly provided along the circumference of the stator tooth portion 121, and the second snap-fitting grooves 1231 are uniformly provided along the circumference of the stator yoke portion 123. Specifically, the openings of the first snap-fitting grooves 1212 are all located on the outer diameter surface of the stator tooth portion 121, and the openings of the second snap-fitting grooves 1231 are located on the inner diameter surface of the stator yoke portion 123, and when the stator yoke portion 123 is sleeved on the stator tooth portion 121, the opening of each second snap-fitting groove 1231 corresponds to a first snap-fitting groove 1212, so that each second snap-fitting groove 1231 cooperates with the corresponding first snap-fitting groove 1212 to form a fixing groove 125.

[0035] More specifically, the fixing member 124 is located in the fixing groove 125, and the outer contour of the fixing member 124 is consistent with the inner contour of the fixing groove 125, so that the fixing member 124 can fix the stator yoke 123 and the stator tooth 121, and the stator yoke 123 and the stator tooth 121 are relatively fixed. In this way, through the cooperation of the fixing member 124 and the fixing groove 125, the relative fixation of the stator tooth 121 and the stator yoke 123 can be achieved, so that the stator tooth 121 and the stator yoke 123 are limited in the circumferential direction, so that the two independent stator tooth 121 and the stator yoke 123 form a stator core, thereby simplifying the assembly process of the stator 12.

[0036] In some embodiments, the fixing member 124 is a carbon fiber rod, which has a high structural strength, thereby facilitating the connection stability between the stator teeth 121 and the stator yoke 123. In addition, the carbon fiber rod is substantially non-conductive and non-magnetic, thereby avoiding eddy current loss on the fixing member 124, thereby facilitating the improvement of the service life of the stator 12 and the improvement of the operating efficiency of the permanent magnet motor 100.

[0037] In this embodiment, a first clamping groove 1212 is provided between two adjacent winding grooves 1211, and a winding groove 1211 is provided between two adjacent first clamping grooves 1212. In this way, the first clamping grooves 1212 and the winding grooves 1211 are arranged at intervals on the stator teeth 121, and the fixing member 124 is assembled by the first clamping groove 1212 and the second clamping groove 1231, which is conducive to improving the connection stability between the stator teeth 121 and the stator yoke 123, and further conducive to improving the structural stability of the stator 12.

[0038] It should be noted that, in the present application, the outer diameter surface of the stator tooth portion 121 and the inner diameter surface of the stator yoke portion 123 are clearance-fitted, thereby facilitating the ease of assembly and disassembly of the stator tooth portion 121 and the stator yoke portion 123 .

[0039] like Figure 3 As shown, as an implementation method, the change of electromagnetic force density in the air gap is calculated within the range of 0-500mm of the circumference of the air gap outer diameter. Wherein, the horizontal axis is the distance of the circumference of the air gap outer diameter, and the vertical axis is the electromagnetic force density in the air gap. It can be seen that within the range of 0-500mm of the circumference of the air gap outer diameter, the waveform change degree of the electromagnetic force density of the stator 12 of the present application is less than the waveform change degree of the electromagnetic force density of the traditional stator structure, that is, the electromagnetic force pulsation of the stator 12 of the present application is less than the electromagnetic force pulsation of the traditional stator structure. Wherein, the stator 12 of the present application is the stator 12 with a closed slot structure of the present application, and the traditional stator structure is the stator structure with an open slot structure. It can be understood that the electromagnetic force pulsation can be effectively reduced by the stator 12 with a closed slot structure of the present application.

[0040] It should be noted that Figure 3 The red waveform line is the electromagnetic force density waveform line of the stator 12 of the present application, and the blue waveform line is the electromagnetic force density waveform line of the traditional stator structure.

[0041] like Figure 4 As shown, as an implementation method, the torque of the motor rotor is calculated during the operation of the motor. The horizontal axis is the motor operation time, and the vertical axis is the torque of the motor rotor. It can be seen that within 0-4ms of the motor operation, the waveform change degree of the torque of the rotor 13 of the permanent magnet motor 100 of the present application is less than the waveform change degree of the torque of the rotor of the traditional motor, that is, the torque pulsation of the rotor 13 of the permanent magnet motor 100 of the present application is less than the rotor torque pulsation of the traditional motor. It can be understood that the torque pulsation of the rotor 13 can be effectively reduced by the stator 12 with a closed slot structure of the present application.

[0042] It should be noted that Figure 4 The red waveform line is the waveform line of the torque of the rotor 13 of the permanent magnet motor 100 of the present application, and the black waveform line is the waveform line of the torque of the rotor of the traditional motor.

[0043] like Figure 5 and Figure 6 As shown, as an implementation method, Figure 5It is a waterfall chart of the ERP (Equivalent Radiated Power) level of the permanent magnet motor 100 of the present application calculated by simulation software, wherein the horizontal axis frequency (Hz) is the sound frequency generated when the permanent magnet motor 100 is running, the vertical axis speed (r / min) is the speed of the permanent magnet motor 100, and the different color areas are the far-field sound power level [dB]. The larger the far-field sound power level, the greater the noise decibel generated by the permanent magnet motor 100; Figure 6 It is a waterfall chart of the ERP (Equivalent Radiated Power) level of a motor with a traditional stator structure calculated using simulation software. Among them, the horizontal axis frequency (Hz) is the sound frequency generated when the motor with a traditional stator structure is running, the vertical axis speed (r / min) is the speed of the motor with a traditional stator structure, and the different color areas are the equivalent radiated power level [dB]. The larger the equivalent radiated power level, the greater the decibel of noise generated by the motor with a traditional stator structure. Within the range of motor speed of 1000-8000r / min, under the premise that the sound frequency generated when the motor is running is consistent, the noise generated by the permanent magnet motor 100 of the present application is less than the noise generated by the motor with a traditional stator structure. It can be understood that the stator 12 with a closed slot structure of the present application can effectively reduce the noise generated by the motor.

[0044] like Figure 7 and Figure 8 As shown in FIG. 1 , as an implementation method, a measurement point is set at 30 cm from the center of the motor to calculate the A-weighted noise level when the motor speed is 5000 r / min. Figure 7 Schematic diagram of the A-weighted noise change of the permanent magnet motor 100 of the present application, Figure 8 It is a schematic diagram of the change of A-weighted noise of a motor with a traditional stator structure. The horizontal axis frequency (Hz) is the sound frequency generated when the motor is running, and the vertical axis actual (dBA) is the A-weighted actual sound pressure level value. It can be seen that within the range of 416.67Hz-6250 Hz, the noise generated by the permanent magnet motor 100 of the present application at a speed of 5000r / min is less than the noise generated by the motor with a stator structure with an open slot structure. It should be noted that the A-weighted noise level is the A sound level measured by a sound level meter or an equivalent measuring instrument through an A-weighted network.

[0045] like Figure 2As shown, as an embodiment, a cross-sectional plane 101 perpendicular to the axial direction of the stator tooth 121 is defined, and the section of the fixing groove 125 cut by the cross-sectional plane 101 is a fixed cross-sectional area. Specifically, the fixed cross-sectional area is one of a triangle, a quadrilateral, a pentagon...n-gon, where n is an integer greater than 3. Such a configuration can make the fixed cross-sectional area polygonal. Exemplarily, the fixed cross-sectional area can be a polygonal shape such as a triangle or a rectangle, and the polygonal shape can limit the movement of the fixing member 124 in the fixing groove 125, so that the fixing member 124 can fix the relative position of the stator tooth 121 and the stator yoke 123.

[0046] Alternatively, the fixed cross section is a shape formed by at least one curve and at least one straight line. Exemplarily, the fixed cross section is a semicircular shape. In this way, the fixing member 124 can fix the relative position of the stator tooth portion 121 and the stator yoke portion 123 through the semicircular fixed cross section.

[0047] Alternatively, the fixed cross section is a shape formed by at least one curve. Exemplarily, the fixed cross section is circular. In this way, the fixing member 124 can fix the relative position of the stator tooth portion 121 and the stator yoke portion 123 through the circular fixed cross section.

[0048] It should be noted that the fixing cross section of the present application is circular. It is understandable that the circular shape is simple, which is conducive to simplifying the processing technology of the first clamping groove 1212 and the second clamping groove 1231 and the fixing member 124, thereby helping to improve the processing efficiency of the stator 12.

[0049] As an implementation mode, the bottom of the winding slot 1211 extends along a preset plane 102 perpendicular to the radial direction of the stator tooth 121, and the minimum distance between the preset plane 102 and the axis of the stator tooth 121 is defined as the slot distance D. The ratio of the inner radius R of the stator tooth 121 to the slot distance D ranges from 0.78 to 0.99. Specifically, the ratio of the inner radius R of the stator tooth 121 to the slot distance D is 0.986. Such a configuration can avoid the ratio of the inner circle radius R of the stator tooth portion 121 to the slot pitch D being too large, which would cause the thickness of the bottom of the winding slot 1211 to be too thin along the radial direction of the stator tooth portion 121, thereby avoiding the thickness of the stator tooth portion 121 being too thin, which would lead to a reduction in the structural strength of the stator tooth portion 121. As a result, the volume of the winding slot 1211 can be increased while meeting the structural strength requirements of the stator tooth portion 121, so as to facilitate the arrangement of more winding coils 122 in the winding slot 1211. In addition, it is also possible to avoid the ratio of the inner circle radius R of the stator tooth 121 to the slot pitch D being too small, resulting in the thickness of the bottom of the winding slot 1211 being too thick along the radial direction of the stator tooth 121, thereby avoiding that part of the magnetic flux lines generated by the winding coil 122 cannot pass through the excessively thick slot bottom, resulting in the magnetic flux lines being unable to close, and further avoiding the magnetic flux lines being unable to close and causing leakage magnetic flux, which is beneficial to reducing the energy loss of the permanent magnet motor 100, and then beneficial to improving the operating power of the permanent magnet motor 100.

[0050] As an implementation mode, a plurality of winding slots 1211 are arranged along the stator teeth 121 and axially penetrate the stator teeth 121. Such an arrangement allows the winding coil 122 to penetrate the stator 12, thereby avoiding the existence of a rotating magnetic field dead angle inside the stator 12 due to the winding coil 122 not penetrating the stator 12, thereby facilitating the improvement of the fullness of the rotating magnetic field inside the stator 12, so as to improve the operating power of the permanent magnet motor 100.

[0051] In this embodiment, a plurality of first engaging grooves 1212 are arranged along the axial direction of the stator tooth portion 121 and penetrate the stator tooth portion 121. In addition, a plurality of second engaging grooves 1231 are arranged along the axial direction of the stator yoke portion 123 and penetrate the stator yoke portion 123. With such arrangement, along the axial direction of the stator tooth portion 121, the fixing member 124 can penetrate the stator tooth portion 121 and the stator yoke portion 123, thereby avoiding the fixing member 124 not completely penetrating the stator tooth portion 121 and the stator yoke portion 123, resulting in a support dead angle of the fixing member 124 in the stator 12, and avoiding the support dead angle between the stator tooth portion 121 and the stator yoke portion 123, resulting in relative deflection of the stator tooth portion 121 and the stator yoke portion 123, thereby facilitating improving the connection stability of the stator tooth portion 121 and the stator yoke portion 123.

[0052] As an embodiment, the stator 12 further includes a stator housing 126 and two end covers 127. Specifically, the stator housing 126 is in the shape of a ring, and the stator housing 126 is sleeved on the stator yoke 123 and has an interference fit with the stator yoke 123. More specifically, the two end covers 127 are respectively located at the two ends of the stator housing 126 along the axial direction of the stator housing 126, and the end covers 127 are fixedly connected to the stator housing 126. In this way, the stator housing 126 and the end covers 127 can protect the internal stator teeth 121, the stator yoke 123 and the winding coil 122, thereby facilitating the improvement of the safety of the permanent magnet motor 100.

[0053] As an optional implementation, the stator housing 126 is provided with a plurality of first mounting holes 1261 along its circumference, and the plurality of first mounting holes 1261 penetrate the stator housing 126 axially along the stator housing 126. In addition, each end cover 127 is provided with a plurality of second mounting holes 1271 cooperating with the first mounting holes 1261, and the plurality of second mounting holes 1271 penetrate the end cover 127 axially along the stator housing 126.

[0054] Specifically, the stator 12 further includes a fastener (not shown), and a plurality of fasteners are provided, each fastener is provided through a second mounting hole 1271 on one of the end covers 127, a corresponding first mounting hole 1261 on the stator housing 126, and a corresponding second mounting hole 1271 on the other end cover 127, so that the two end covers 127 and the stator housing 126 are fixedly connected. In this way, the stator housing 126 and the two end covers 127 can be fixed by the fasteners cooperating with the first mounting hole 1261 and the second mounting hole 1271, so as to support the stator teeth 121, the stator yoke 123 and the winding coil 122, without using other fasteners to fix the above-mentioned components, thereby helping to reduce the number of fasteners used, further reducing the production cost of the permanent magnet motor 100, and also helping to improve the assembly efficiency of the permanent magnet motor 100.

[0055] In this embodiment, the stator housing 126 is made of aluminum alloy. With this arrangement, the aluminum alloy material has a lighter weight. Therefore, the weight of the stator housing 126 can be reduced while satisfying the structural strength of the stator housing 126, so that the stator 12 is more lightweight. In addition, the fastener is a bolt made of steel material. With this arrangement, the stator housing 126 and the two end covers 127 can be fixedly connected by passing the bolts through the first mounting hole 1261 and the second mounting hole 1271 and tightening the bolts, which is beneficial to improving the assembly convenience of the stator housing 126 and the end covers 127. In addition, the bolts made of steel material are industrial standard parts, so there is no need to customize the fasteners separately, which is beneficial to simplifying the processing technology of the permanent magnet motor 100.

[0056] It should be noted that the stator housing 126 may also be made of ductile iron, gray cast iron, or other materials, and the present application does not limit the material of the stator housing 126 .

[0057] It should be noted that the fasteners may also be structures such as screws and rivets. The present application does not limit the structural form of the fasteners, and they only need to be able to fix the stator housing 126 and the two end covers 127.

[0058] As an embodiment, the outer diameter of the stator tooth portion 121 is substantially consistent with the inner diameter of the stator yoke portion 123. Such an arrangement enables the stator tooth portion 121 and the stator yoke portion 123 to be clearance-matched, thereby facilitating the assembly convenience of the stator tooth portion 121 and the stator yoke portion 123. Moreover, through the above arrangement, after the stator tooth portion 121 and the stator yoke portion 123 are assembled, the winding slot 1211 can cooperate with the inner diameter surface of the stator yoke portion 123 to form a closed slot structure, thereby facilitating the reduction of the vibration noise of the permanent magnet motor 100 and the improvement of the material utilization rate. In addition, through the above arrangement, the connection tightness between the stator tooth portion 121 and the stator yoke portion 123 can also be improved, thereby facilitating the improvement of the support stability between the stator tooth portion 121 and the stator yoke portion 123, and further facilitating the improvement of the overall structural strength of the stator 12.

[0059] like Fig. 9 As shown, as an embodiment, the rotor 13 includes a first rotating shaft 131, a second rotating shaft 132, a permanent magnet 133, a first sleeve 134 and a second sleeve 135. The first rotating shaft 131 and the second rotating shaft 132 are fixedly connected, and the first rotating shaft 131 and the second rotating shaft 132 are used to output torque. A plurality of permanent magnets 133 are provided, and the plurality of permanent magnets 133 are in the shape of a fan ring, and the plurality of permanent magnets 133 are fixedly connected to the first rotating shaft 131, and the permanent magnets 133 are used to generate a magnetic field so that the magnetic field can cooperate with the rotating magnetic field generated by the stator 12 to drive the first rotating shaft 131 and the second rotating shaft 132 to rotate. The first sleeve 134 is wound on the plurality of permanent magnets 133, and the second sleeve 135 is sleeved on the first sleeve 134 and is interference fit with the first sleeve 134. In this way, the first sleeve 134 and the second sleeve 135 can provide a pre-tightening force to the permanent magnet 133 toward the first rotating shaft 131, so as to prevent the permanent magnet 133 from being separated from the first rotating shaft 131 due to the centrifugal force during the rotation of the first rotating shaft 131, thereby helping to improve the connection stability between the permanent magnet 133 and the first rotating shaft 131.

[0060] Specifically, the first sheath 134 is made of an amorphous alloy. With such a configuration, the amorphous alloy has a relatively high magnetic permeability, so that the first sheath 134 surrounding the permanent magnet 133 can form a pole shoe layer, thereby making the magnetic field distribution produced by the permanent magnet 133 more uniform, which is beneficial to improving the operating power of the permanent magnet motor 100. Secondly, the amorphous alloy material has the characteristics of high saturation magnetic induction intensity and low energy loss, so that the first sheath 134 can concentrate on bearing the induced eddy current caused by the armature reaction in the permanent magnet motor 100, so as to avoid the permanent magnet 133 bearing the induced eddy current and causing the permanent magnet 133 to be overheated, thereby avoiding the permanent magnet 133 from being overheated and causing the permanent magnet 133 to be demagnetized at high temperature, which is beneficial to improving the service life of the permanent magnet 133.

[0061] It should be noted that the motor will generate armature reaction during the power-on operation, which will cause the magnetic field inside the motor to be distorted, and then cause the formation of induced eddy currents in the parts of the motor, so that the parts generate energy loss and heat. In the present application, since the amorphous alloy has a high saturation magnetic induction intensity compared to the permanent magnet 133, the induced eddy currents formed by the armature reaction in the permanent magnet motor 100 can be concentrated on the first sheath 134. In addition, the amorphous alloy has a lower energy loss than the permanent magnet 133, so it can avoid the excessive energy loss and heat generated by the induced eddy current on the first sheath 134, which is conducive to reducing the heat generated by the permanent magnet motor 100 during operation, thereby reducing the heat dissipation pressure of the permanent magnet motor 100, so as to improve the operating power of the permanent magnet motor 100.

[0062] More specifically, the second sheath 135 is made of carbon fiber material. In this way, the carbon fiber material has a high structural strength, which is beneficial to improving the overall structural strength of the rotor 13. Secondly, the carbon fiber material has the characteristics of being basically non-magnetic and non-conductive, so that eddy current loss caused by electrical and magnetic conductivity can be avoided on the second sheath 135, which is beneficial to improving the operating performance of the permanent magnet motor 100.

[0063] In the present application, by setting the first sleeve 134 between the second sleeve 135 and the permanent magnet 133, the shear force generated by the rotation of the first rotating shaft 131 on the second sleeve 135 can be reduced, so as to avoid the second sleeve 135 being borne by excessive shear force and causing the second sleeve 135 to fall off or break, which is beneficial to improving the installation stability of the second sleeve 135 on the rotor 13.

[0064] like Fig.10 and Fig.11 As shown in the figure, the force analysis diagram of the carbon fiber sheath is calculated at the same motor speed. Fig.10 This is a force analysis diagram of the second sheath 135 of the permanent magnet motor 100 of the present application. Fig.11It is a force analysis diagram of the carbon fiber sheath in the motor without adding the amorphous alloy sheath. It can be seen that the shear stress (maximum value of 101.27MPa) borne by the second sheath 135 of the permanent magnet motor 100 of the present application is less than the shear stress (maximum value of 106.82MPa) borne by the carbon fiber sheath in the motor without adding the amorphous alloy sheath. In addition, the range of the shear stress greater than 100MPa borne by the second sheath 135 of the permanent magnet motor 100 of the present application is less than the range of the shear stress greater than 100MPa borne by the carbon fiber sheath in the motor without adding the amorphous alloy sheath. It can be understood that the shear stress borne by the second sheath 135 of the permanent magnet motor 100 of the present application is less than the shear stress borne by the carbon fiber sheath in the motor without adding the amorphous alloy sheath, so that the second sheath 135 in the permanent magnet motor 100 of the present application can withstand a higher motor speed, which is conducive to improving the critical speed of the permanent magnet motor 100.

[0065] In addition, by setting the first sheath 134 and the second sheath 135, the air gap thickness in the permanent magnet motor 100 can be reduced, thereby weakening the air gap magnetic field in the permanent magnet motor 100, and further reducing the air gap harmonics generated by the air gap magnetic field, which is beneficial to reduce the energy loss caused by the air gap harmonics, and then help improve the operating performance of the permanent magnet motor 100.

[0066] In this embodiment, a mounting groove 1311 is provided in the first rotating shaft 131, and the second rotating shaft 132 is at least partially located in the mounting groove 1311 and fixed to the mounting groove 1311. In this way, the mass of the first rotating shaft 131 can be reduced by providing the mounting groove 1311, which is beneficial to reducing the overall moment of inertia of the rotor 13, and further beneficial to improving the critical speed of the permanent magnet motor 100. Secondly, fixing the second rotating shaft 132 in the mounting groove 1311 can improve the structural strength of the first rotating shaft 131, which is beneficial to improving the overall structural strength of the rotor 13. Moreover, in the present application, the second rotating shaft 132 is a hollow shaft, so that the weight of the second rotating shaft 132 can be reduced, so that the overall weight of the rotor 13 can be reduced while the strength requirements of the rotor 13 are met, which is beneficial to reducing the overall moment of inertia of the rotor 13, so as to further improve the critical speed of the permanent magnet motor 100.

[0067] In this embodiment, an annular groove 1312 is provided on the first rotating shaft 131, and the opening of the annular groove 1312 is located on the outer surface of the first rotating shaft 131. Furthermore, a plurality of permanent magnets 133 are distributed in the annular groove 1312 along the circumference of the first rotating shaft 131. In this way, the permanent magnets 133 can be limited by the annular groove 1312, which is conducive to improving the installation stability of the permanent magnets 133 on the first rotating shaft 131.

[0068] As an optional embodiment, the annular groove 1312 is consistent with the length of the permanent magnet 133 along the axial direction of the first rotating shaft 131. In this way, the tightness of the permanent magnet 133 in the annular groove 1312 can be improved to prevent the permanent magnet 133 from deflecting left and right in the annular groove 1312, thereby further improving the installation stability of the permanent magnet 133 on the first rotating shaft 131.

[0069] In this embodiment, the lengths of the first sheath 134 and the second sheath 135 along the axial direction of the first rotating shaft 131 are greater than the length of the annular groove 1312 along the axial direction of the first rotating shaft 131. In this way, the first sheath 134 and the second sheath 135 can completely cover the permanent magnet 133, so as to prevent the permanent magnet 133 from being exposed to the air gap and causing the permanent magnet 133 to be demagnetized due to the magnetic field distortion in the air gap, thereby facilitating the service life of the permanent magnet 133.

[0070] like Fig.12 As shown, as an embodiment, the second rotating shaft 132 is provided with a plurality of weight-reducing grooves 1321, and the plurality of weight-reducing grooves 1321 are evenly distributed on the outer diameter surface of the second rotating shaft 132 along the circumference of the second rotating shaft 132, and the openings of the plurality of weight-reducing grooves 1321 face the first rotating shaft 131. In this way, the weight-reducing grooves 1321 can further reduce the weight of the second rotating shaft 132, thereby further reducing the rotational inertia of the rotor 13 as a whole. Moreover, the setting of the weight-reducing grooves 1321 can reduce the weight of the second rotating shaft 132 on the premise of meeting the strength requirements of the second rotating shaft 132, thereby reducing the rotational inertia of the rotor 13 as a whole on the premise of being able to meet the strength requirements of the rotor 13 as a whole, so as to help improve the power density of the permanent magnet motor 100.

[0071] like Fig. 9 As shown, as an implementation mode, the two ends of the first rotating shaft 131 along its axial direction are defined as a first section 1313 and a second section 1314, respectively. The length of the first section 1313 along the axial direction of the first rotating shaft 131 is consistent with the length of the second section 1314 along the axial direction of the first rotating shaft 131; the volume of the first section 1313 is greater than the volume of the second section 1314; Alternatively, an extension piece for increasing the volume of the first section 1313 is disposed on the first section 1313 , and the extension piece is fixed on the first section 1313 or is integrally formed with the first section 1313 .

[0072] Through the above arrangement, the volume on the first rotating shaft 131 can be increased, and the first rotating shaft 131 is described by taking the first section 1313 and the second section 1314 as an example. Through the volume difference between the first section 1313 and the second section 1314, the thickness of the air gap at the first section 1313 and the second section 1314 in the permanent magnet motor 100 can be changed, thereby changing the flow diameter of the air in the air gap. Therefore, when the rotor 13 rotates to drive the air flow in the air gap, the air is restricted by the change of the air gap flow diameter, which reduces the air flow in the air gap, thereby forming a low vacuum state in the air gap, thereby reducing the contact amount of the rotor 13 with the air in the air gap, so as to reduce the wear caused by the contact with the air during the rotation of the rotor 13, and reduce the noise caused by the contact with the air during the rotation of the rotor 13, thereby improving the service life of the rotor 13 and reducing the operating noise of the permanent magnet motor 100.

[0073] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the claims attached to this application.

Claims

1. A permanent magnet motor, characterized in that: The permanent magnet motor comprises: case; A stator, the stator being fixed in the housing and comprising: A stator tooth portion, the stator tooth portion is in a ring shape and is made of an amorphous alloy, the stator tooth portion is provided with a plurality of winding slots and a plurality of first clamping slots, the openings of the winding slots and the openings of the first clamping slots are both located on the outer diameter surface of the stator tooth portion, one first clamping slot is provided between two adjacent winding slots, and one winding slot is provided between two adjacent first clamping slots; A winding coil, wherein the winding coil is installed in the winding slot; A stator yoke, which is in a ring shape and made of an amorphous alloy, is sleeved on the stator teeth so that the inner diameter surface of the stator yoke covers and closes the opening of the winding slot, and the stator yoke is provided with a plurality of second clamping grooves, the openings of the second clamping grooves are located on the inner diameter surface of the stator yoke, each opening of the second clamping groove corresponds to one of the first clamping grooves, and each of the second clamping grooves cooperates with the corresponding first clamping groove to form a fixing groove; A fixing member, the fixing member is located in the fixing groove, and the outer contour of the fixing member is consistent with the inner contour of the fixing groove, so that the fixing member can fix the stator yoke and the stator tooth portion, and make the stator yoke and the stator tooth portion relatively fixed; The rotor is surrounded by the stator and is rotatably connected to the housing so that the rotor can rotate relative to the stator.

2. The permanent magnet motor according to claim 1, characterized in that: A section plane perpendicular to the axial direction of the stator tooth portion is defined, and the section of the fixed slot cut by the section plane is the fixed section; The fixed cross section is one of a triangle, a quadrilateral, a pentagon, ... an n-gon, wherein n is an integer greater than 3; Or the fixed cross section is a shape formed by at least one curve and at least one straight line; Or the fixed cross section is a shape formed by at least one curve.

3. The permanent magnet motor according to claim 1, characterized in that: The bottom of the winding slot extends along a preset plane perpendicular to the radial direction of the stator tooth, the minimum distance between the preset plane and the axis of the stator tooth is the slot pitch, and the ratio of the inner circle radius of the stator tooth to the slot pitch ranges from 0.78 to 0.

99.

4. The permanent magnet motor according to claim 1, characterized in that: The plurality of winding slots and the plurality of first clamping slots are arranged along the axial direction of the stator tooth portion and penetrate the stator tooth portion; and the plurality of second clamping slots are arranged along the axial direction of the stator yoke portion and penetrate the stator yoke portion.

5. The permanent magnet motor according to claim 1, characterized in that: The stator also includes a stator housing and two end covers. The stator housing is in a ring shape. The stator housing is sleeved on the stator yoke and has an interference fit with the stator yoke. The two end covers are respectively located at two ends of the stator housing along the axial direction of the stator housing, and the end covers are fixedly connected to the stator housing.

6. The permanent magnet motor according to claim 5, characterized in that: The stator housing is provided with a plurality of first mounting holes along its circumference, and the plurality of first mounting holes penetrate the stator housing axially along the stator housing, and each end cover is provided with a plurality of second mounting holes matching with the first mounting holes, and the plurality of second mounting holes penetrate the end cover axially along the stator housing, and the stator further comprises a plurality of fasteners, each of the fasteners is passed through a second mounting hole on one of the end covers, a corresponding first mounting hole on the stator housing, and a corresponding second mounting hole on the other end cover, so that the two end covers are fixedly connected to the stator housing; The stator shell is made of aluminum alloy, and the fasteners are bolts made of steel.

7. The permanent magnet motor according to claim 1, characterized in that: The outer diameter of the stator teeth portion is substantially consistent with the inner diameter of the stator yoke portion.

8. The permanent magnet motor according to claim 1, characterized in that: The rotor comprises: A first rotating shaft, wherein a mounting groove is formed in the first rotating shaft, and an annular groove is formed on the first rotating shaft, wherein an opening of the annular groove is located on an outer surface of the first rotating shaft; a second rotating shaft, the second rotating shaft being at least partially located in the mounting groove and fixed to the mounting groove; A plurality of permanent magnets, wherein the plurality of permanent magnets are in a fan-shaped ring shape and are distributed in the annular groove along the circumference of the first rotating shaft; A first sheath, wherein the first sheath is wound around the plurality of permanent magnets; a second sheath, the second sheath being sleeved on the first sheath and having an interference fit with the first sheath; The first sheath is made of amorphous alloy; the second sheath is made of carbon fiber material.

9. The permanent magnet motor according to claim 8, characterized in that: The annular groove is consistent with the length of the permanent magnet along the axial direction of the first rotating shaft; The lengths of the first sleeve and the second sleeve along the axial direction of the first rotating shaft are greater than the length of the annular groove along the axial direction of the first rotating shaft.

10. The permanent magnet motor according to claim 8, characterized in that: The second rotating shaft is provided with a plurality of weight-reducing grooves, which are evenly distributed on the outer diameter surface of the second rotating shaft along the circumference of the second rotating shaft, and the openings of the plurality of weight-reducing grooves face the first rotating shaft.

11. The permanent magnet motor according to claim 8, characterized in that: The first rotating shaft is defined as having two ends along its axial direction as a first section and a second section respectively, the length of the first section along the axial direction of the first rotating shaft is consistent with the length of the second section along the axial direction of the first rotating shaft; the volume of the first section is greater than the volume of the second section; Or the first section is provided with an extension piece for increasing the volume of the first section, and the extension piece is fixed on the first section or is integrally formed with the first section.

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