A skew-pole permanent magnet synchronous motor

Abstract

This invention provides a slanted-pole permanent magnet synchronous motor. The stator is fixed inside the motor housing, and the rotor is fixed on the output shaft. The output shaft is movably mounted inside the motor housing via a bearing seat and a rolling bearing. The rotor is movably positioned within the inner ring of the stator. This invention has the following advantages: By setting an air intake hood and a dust filter assembly inside the rear cover, the upper part of the dust filter assembly is movably connected via a shaft pin, and the lower left part is connected to a return spring via a telescopic rod. In conjunction with the push rod on the air intake fan, when the air intake fan rotates, the push rod allows the dust filter assembly to swing back and forth under the action of the return spring, and a certain degree of vibration can occur. This facilitates the removal of dust adhering to the dust filter assembly from the filter cloth surface. Combined with the air intake fan, cold air can directly act on the stator and rotor, improving the cooling effect and preventing dust from entering the stator and rotor, thus protecting the stator and rotor.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and specifically relates to a slanted-pole permanent magnet synchronous motor and its usage method. Background Technology

[0002] Chinese Patent No. CN110365180A discloses a V-shaped slanted-pole permanent magnet synchronous motor, including a housing, a stator, and a rotor. The rotor is a V-shaped slanted-pole rotor formed by multiple rotor laminations stacked in a staggered manner. Each rotor lamination in the V-shaped slanted-pole rotor has multiple polygonal permanent magnet slots formed on it, which are evenly distributed on the same circumference and concentric with the motor shaft hole, for placing permanent magnets. Adjacent permanent magnet slots are combined to form a U-shaped or V-shaped structure. The permanent magnets are embedded in the permanent magnet slots in an alternating N-pole and S-pole manner. The rotor of the slanted-pole permanent magnet synchronous motor disclosed in this invention is a V-shaped slanted-pole rotor formed by multiple rotor laminations stacked in a staggered manner. The axial forces of the upper and lower sections of the V-shaped slanted-pole rotor are exactly opposite in direction, and the combined axial force is 0, resulting in better torque pulsation suppression.

[0003] In the above technical solution, eight circulating fan blades are provided at each end of the end cover to ensure that the heat dissipation of the permanent magnet in the rotor body during operation and the heat inside the motor are dissipated to the motor housing through the circulating fan blades. In this technical solution, a mesh-like cover is usually set on the end cover of the motor to block external debris, but it is difficult to block fine dust. Fine dust can easily enter the inner wall of the motor during use, causing damage to the rotor and stator and reducing the service life of the motor. Therefore, we provide a slanted magnetic pole permanent magnet synchronous motor to solve this problem. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a slanted-pole permanent magnet synchronous motor to solve the problems mentioned in the background art.

[0005] This invention is achieved through the following technical solution: a slanted pole permanent magnet synchronous motor, including a motor housing, a stator, a rotor, a rear cover and an output shaft, wherein a junction box is provided on the motor housing, the stator is fixed inside the motor housing, the rear cover is installed on the rear side of the motor housing, and a front cover is installed on the front side of the motor housing;

[0006] The output shaft is fixed with a rotor. The output shaft is movably mounted inside the motor housing through a bearing seat and a rolling bearing, and the rightmost end of the output shaft is located outside the front cover.

[0007] The rotor is movably positioned within the inner ring of the stator, and a gap exists between the outer ring surface of the rotor and the inner ring of the stator.

[0008] In a preferred embodiment, a wind guide shroud is fixed inside the left side of the motor housing, and the bearing seat is fixed inside the wind guide shroud by four support rods.

[0009] The inner diameter of the air guide shroud gradually decreases from left to right, and the rightmost end of the air guide shroud coincides with the inner diameter of the stator.

[0010] In a preferred embodiment, the leftmost end of the output shaft passes through the bearing housing and is located on the left side of the bearing housing. An intake fan is installed at the leftmost end of the output shaft. A push rod is provided on the left side of the fan blade at the upper end of the intake fan, and the left end of the push rod has a hemispherical structure.

[0011] The front cover surface has four air outlets arranged in a ring shape, and filter cotton is provided on the air outlets.

[0012] The inner wall of the motor housing is provided with a spiral tube in a spiral shape. The left and right ends of the spiral tube are respectively located on the upper left and right sides of the motor housing and are respectively connected to the liquid inlet and liquid outlet. By introducing coolant into the spiral tube, the stator can be cooled quickly.

[0013] In a preferred embodiment, a circular hole is provided on the left side surface of the rear cover, and an air intake hood is welded into the circular hole. A baffle plate is integrally provided on the lower right side of the interior of the air intake hood, and a second dustproof net is provided above the baffle plate. A first dustproof net is provided on the left side of the air intake hood. The inner diameter of the air intake hood gradually increases from left to right. The airflow of cold air through the air intake hood is small and the speed is slow, which facilitates filtration and makes the dust on the dust filter assembly fall off easily.

[0014] A mounting shaft plate is provided on the upper part of the rear cover, and a dust filter assembly is movably mounted inside the rear cover via the mounting shaft plate and shaft pin.

[0015] The dust filtration assembly includes an installation ring, a filter cloth, a contact arc plate, a contact groove, an impact block, and a cleaning strip. The filter cloth is disposed inside the installation ring. The contact arc plate is disposed below the right side surface of the installation ring, and a contact groove is disposed inside the contact arc plate. The two sides of the contact groove extend outward and communicate with the outside of the contact arc plate.

[0016] The impact block is located on the lower left side of the mounting ring, and a cleaning strip is located below the impact block. The cleaning strip has an arc-shaped cross-section. When the output shaft drives the intake fan to rotate rapidly, the front end of the push rod on the intake fan blade will move along the contact groove and push the lower part of the mounting ring to the left. When the intake fan blade is at its lowest position, the travel of the mounting ring is at its maximum distance, and the impact block is in contact with the impact strip at this time.

[0017] In a preferred embodiment, an impact strip is provided at the lower part of the rear cover, and the position of the impact strip corresponds to the position of the impact block;

[0018] Multiple telescopic sleeves are fixed inside the left side of the rear cover. A return spring is connected inside the telescopic sleeve. The other end of the return spring is connected to the telescopic rod. The telescopic rod is placed outside the telescopic sleeve and connected to the mounting ring.

[0019] In a preferred embodiment, the upper end of the telescopic sleeve is provided with a sliding hole, and the upper end of the telescopic rod is provided with an impact plate, which passes through the sliding hole and is placed outside the telescopic sleeve.

[0020] The lower air intake shroud is movably connected to the lower slide plate via a pivot pin. The lower part of the lower slide plate contacts but is not connected to the impact strip, and the upper end of the impact strip contacts but is not connected to the top of the lower slide plate.

[0021] In a preferred embodiment, a contact base is provided at the bottom of the interior of the rear cover. The upper surface of the contact base has an arc-shaped structure with the right side higher than the left side. The upper surface of the contact base is sealed and slidably designed below the outer ring surface of the mounting ring. The cleaning strip contacts the upper surface of the contact base. The dust on the filter cloth falls onto the contact base as the dust filter assembly swings left and right. When the dust filter assembly swings, the cleaning strip causes the dust to move to the left into the collection hole for collection.

[0022] A collection hole is provided inside the lower left side of the rear cover, and a sealing plug is connected to the collection hole. The upper surface of the sealing plug is recessed downward to form a collection groove.

[0023] In a preferred embodiment, the stator includes a stator core and a stator winding. The stator core is fixed inside the motor housing, and the stator winding is wound around the stator core.

[0024] The rotor includes a rotor disk, permanent magnet one, permanent magnet three, permanent magnet four and permanent magnet two. Each rotor disk is provided with multiple permanent magnet one, permanent magnet three, permanent magnet four and permanent magnet two. The four rotor disks are connected together.

[0025] In a preferred embodiment, the rotor disk has a plurality of asymmetrically distributed embedding slots, two adjacent embedding slots form a V shape, and permanent magnet one and permanent magnet two are respectively disposed in two adjacent embedding slots.

[0026] The rotor disk has multiple equally spaced oblique arc grooves one and two. Permanent magnet three and permanent magnet four are respectively arranged in oblique arc groove one and oblique arc groove two. The oblique arc groove one and oblique arc groove two on the frontmost rotor disk are offset to the right by three degrees and extend to the second rotor disk. The oblique arc groove one and oblique arc groove two on the third and fourth rotor disks are symmetrically arranged with the rear surface of the second rotor disk as the reference plane and the first and second rotor disks.

[0027] Each rotor disk has multiple annularly distributed connecting holes formed through its front surface, and the multiple connecting holes on the four rotor disks overlap one by one.

[0028] After adopting the above technical solution, the beneficial effects of the present invention are as follows: by setting an air intake hood and a dust filter assembly inside the rear cover, the upper part of the dust filter assembly is movably connected by a shaft pin, and the lower left part is connected to a return spring by a telescopic rod. With the help of the push rod on the air intake fan, when the air intake fan rotates, the push rod can make the dust filter assembly swing back and forth under the action of the return spring, and can vibrate to a certain extent, which makes it easier for the dust adhering to the dust filter assembly fan to be removed from the surface of the filter cloth. The movable sliding plate will also vibrate under the action of the telescopic rod, so that the dust can slide down to the contact base, and finally enter the collection hole for collection under the action of the cleaning strip. With the help of the air intake fan, the cold air can directly act on the stator and rotor, which improves the cooling effect and prevents the dust from entering the stator and rotor, thus protecting the stator and rotor.

[0029] By combining four rotor disks to form a rotor, and setting multiple asymmetrically distributed permanent magnets I and II on each rotor disk, and arranging permanent magnets I and II in a V-shaped configuration within the rotor disk, the torque on the rotor is approximately sinusoidal, resulting in small torque ripple. This also reduces magnetic field harmonics in the permanent magnet synchronous motor, improves the air gap flux density and radial force of the permanent magnet synchronous motor, and, in conjunction with permanent magnets III and IV, further enhances the torque ripple suppression effect. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional schematic diagram of a slanted-pole permanent magnet synchronous motor according to the present invention.

[0032] Figure 2This is a schematic diagram of the front cover of a slanted-pole permanent magnet synchronous motor of the present invention before installation.

[0033] Figure 3 This is a cross-sectional schematic diagram of a slanted-pole permanent magnet synchronous motor according to the present invention.

[0034] Figure 4 This is a schematic diagram of the air intake cover of a slanted pole permanent magnet synchronous motor according to the present invention.

[0035] Figure 5 This is a schematic diagram showing the connection of the mounting ring, filter cloth, and contact arc plate of a slanted pole permanent magnet synchronous motor according to the present invention.

[0036] Figure 6 This is an enlarged schematic diagram of point A of a slanted-pole permanent magnet synchronous motor according to the present invention.

[0037] Figure 7 This is a schematic diagram of the rotor disk of a slanted-pole permanent magnet synchronous motor according to the present invention.

[0038] Figure 8 This is a schematic diagram of the rotor structure of a slanted-pole permanent magnet synchronous motor according to the present invention.

[0039] Figure 9 This is a top view of the rotor of a slanted-pole permanent magnet synchronous motor according to the present invention.

[0040] Figure 10 This is a side view of the rotor, stator, and motor housing of a slanted-pole permanent magnet synchronous motor according to the present invention.

[0041] In the diagram, 1-motor housing, 11-liquid outlet, 12-spiral tube, 13-liquid inlet, 14-air guide shroud, 15-bearing seat, 2-rear cover, 21-mounting shaft plate, 22-air inlet shroud, 221-dustproof net one, 222-dustproof net two, 223-barrier plate, 23-dust filter assembly, 231-mounting ring, 232-filter cloth, 233-contact arc plate, 234-contact groove, 235-lower slide plate, 236-impact block, 237-cleaning strip, 24-contact base, 25-impact strip. 26-Telescopic sleeve, 261-Reset spring, 262-Impact plate, 263-Telescopic rod, 27-Collection hole, 28-Sealing plug plate, 3-Front cover, 4-Output shaft, 41-Intake fan, 42-Push rod, 5-Stator, 51-Stator core, 52-Stator winding, 6-Rotor, 61-Rotor disc, 62-Embedded slot, 63-Slanted arc slot one, 64-Slanted arc slot two, 65-Connecting hole, 66-Permanent magnet one, 67-Permanent magnet three, 68-Permanent magnet four, 69-Permanent magnet two, 7-Junction box. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please see Figures 1 to 10 The present invention provides a technical solution: a slanted pole permanent magnet synchronous motor, including a motor housing 1, a stator 5, a rotor 6, a rear cover 2 and an output shaft 4. A junction box 7 is provided on the motor housing 1, the stator 5 is fixed inside the motor housing 1, the rear cover 2 is installed on the rear side of the motor housing 1, and a front cover 3 is installed on the front side of the motor housing 1.

[0044] The output shaft 4 is fixed with a rotor 6. The output shaft 4 is movably installed inside the motor housing 1 through the bearing seat 15 and the rolling bearing, and the rightmost end of the output shaft 4 is placed outside the front cover 3.

[0045] The rotor 6 is movably positioned within the inner ring of the stator 5, and there is a gap between the outer ring surface of the rotor 6 and the inner ring of the stator 5.

[0046] An air guide shroud 14 is fixed inside the left side of the motor housing 1, and the bearing seat 15 is fixed inside the air guide shroud 14 by four support rods.

[0047] The inner diameter of the air guide shroud 14 gradually decreases from left to right, and the rightmost end of the air guide shroud 14 coincides with the inner diameter of the stator 5.

[0048] The leftmost end of the output shaft 4 passes through the bearing housing 15 and is located on the left side of the bearing housing 15. An intake fan 41 is installed at the leftmost end of the output shaft 4. A push rod 42 is provided on the left side of the fan blade at the upper end of the intake fan 41, and the left end of the push rod 42 has a hemispherical structure.

[0049] The front cover 3 has four air outlets arranged in a ring on its surface, and filter cotton is installed on the air outlets.

[0050] The inner wall of the motor housing 1 is provided with a spiral tube 12 in a spiral shape. The left and right ends of the spiral tube 12 are respectively located on the upper left and right sides of the motor housing 1 and are respectively connected to the liquid inlet 13 and the liquid outlet 11. By introducing coolant into the spiral tube 12, the stator 5 can be cooled quickly.

[0051] As an embodiment of the present invention, please refer to Figure 3 , Figure 4 , Figure 5 and Figure 6A circular hole is provided on the left side surface of the rear cover 2, and an air intake hood 22 is welded inside the circular hole. A baffle plate 223 is integrally provided on the lower right side of the interior of the air intake hood 22. A second dustproof net 222 is provided above the baffle plate 223. A first dustproof net 221 is provided on the left side of the air intake hood 22. The inner diameter of the air intake hood 22 gradually increases from left to right. The airflow of cold air through the air intake hood 22 is small and the speed is slow, which facilitates filtration and makes the dust on the dust filter assembly 23 fall off easily.

[0052] A mounting shaft plate 21 is provided on the upper part of the rear cover 2, and a dust filter assembly 23 is movably installed inside the rear cover 2 via the mounting shaft plate 21 and shaft pin.

[0053] The dust filter assembly 23 includes an mounting ring 231, a filter cloth 232, a contact arc plate 233, a contact groove 234, an impact block 236, and a cleaning strip 237. The filter cloth 232 is disposed inside the mounting ring 231. The contact arc plate 233 is disposed below the right side surface of the mounting ring 231, and the contact groove 234 is disposed inside the contact arc plate 233. The two sides of the contact groove 234 extend outward and communicate with the outside of the contact arc plate 233.

[0054] The impact block 236 is located on the lower left side of the mounting ring 231, and a cleaning strip 237 is located below the impact block 236. The cleaning strip 237 has an arc-shaped cross-section. When the output shaft 4 drives the intake fan 41 to rotate rapidly, the front end of the push rod 42 on the fan blade of the intake fan 41 will move along the contact groove 234 and push the lower part of the mounting ring 231 to move to the left. When the fan blade of the intake fan 41 is at its lowest position, the travel of the mounting ring 231 is at its maximum distance, and the impact block 236 is in contact with the impact strip 25 at this time.

[0055] An impact strip 25 is provided inside the lower part of the rear cover 2, and the position of the impact strip 25 corresponds to the position of the impact block 236;

[0056] Multiple telescopic sleeves 26 are fixed inside the left side of the rear cover 2 at equal intervals. A return spring 261 is connected inside the telescopic sleeve 26. The other end of the return spring 261 is connected to the telescopic rod 263. The telescopic rod 263 is placed outside the telescopic sleeve 26 and is connected to the mounting ring 231.

[0057] The upper end of the telescopic sleeve 26 is provided with a sliding hole, and the upper end of the telescopic rod 263 is provided with an impact plate 262, which passes through the sliding hole and is placed outside the telescopic sleeve 26.

[0058] The lower slide plate 235 is movably connected to the lower part of the air intake hood 22 via a pivot pin. The lower part of the lower slide plate 235 contacts the impact strip 25 but is not connected, and the upper end of the impact plate 262 contacts the top of the lower slide plate 235 but is not connected.

[0059] The bottom of the rear cover 2 is provided with a contact base 24. The upper surface of the contact base 24 is arc-shaped and the right side is higher than the left side. The upper surface of the contact base 24 is sealed and slidable below the outer ring surface of the mounting ring 231. The cleaning strip 237 contacts the upper surface of the contact base 24. The dust on the filter cloth 232 falls onto the contact base 24 as the dust filter assembly 23 swings left and right. When the dust filter assembly 23 swings, the cleaning strip 237 causes the dust to move to the left into the collection hole 27 for collection.

[0060] A collection hole 27 is provided in the lower left of the rear cover 2, and a sealing plug plate 28 is connected to the collection hole 27. The upper surface of the sealing plug plate 28 is recessed downward to form a collection groove.

[0061] In actual use, after connecting the terminals inside the power cord junction box 7, current flows through the stator winding 52 in the stator 5, thereby generating a magnetic field. This magnetic field interacts with the magnetic field in the rotor 6, causing the rotor 6 to drive the output shaft 4 to rotate. The rotating output shaft 4 causes the intake fan 41 to rotate as well, allowing external cold air to enter the rear cover 2 and the rear side of the motor housing 1 through the intake shroud 22. Because the intake shroud 22 is equipped with dustproof net 1 221 and dustproof net 222 inside, it will block larger dust particles. However, because the inner diameter of the intake shroud 22 gradually increases from left to right, the airflow of cold air entering the intake shroud 22 is relatively small and the speed is relatively slow. The cold air entering the intake shroud 22 will be blocked by the baffle plate 223. The obstruction causes the cold air to act on the upper part of the rear cover 2 instead of blowing directly to the lower part of the filter cloth 232. At this time, most of the fine dust is concentrated on the upper part of the filter cloth 232, making it difficult to block the lower part of the filter cloth 232, which facilitates the flow of air. Then, the cold air enters the motor housing 1 through the filter cloth 232. When passing through the air guide shroud 14, since the inner diameter of the air guide shroud 14 gradually decreases from left to right, and the rightmost end of the air guide shroud 14 coincides with the inner diameter of the stator 5, the cold air velocity will increase. Some of it enters the gap between the rotor 6 and the stator 5, and some enters the connecting hole 65. Finally, it is concentrated on the right side of the motor housing 1 and discharged through the air outlet, thereby cooling the rotor 6, stator 5 and output shaft 4.

[0062] Because a push rod 42 is provided on the intake fan 41, and the leftmost end of the push rod 42 has a hemispherical structure, as the intake fan 41 rotates with the fan blades, when it reaches the lower half, the front end of the push rod 42 will move along the contact groove 234 and push the lower part of the mounting ring 231 to move to the left. When the intake fan 41 blades are at their lowest position, the travel of the mounting ring 231 is at its maximum distance, and at this time the impact block 236 contacts and collides with the impact plate 25. When the mounting ring 231 moves to the left, it will cause the telescopic rod 263 to compress the return spring 261. The return spring 261 has restoring potential energy. When the push rod 42 leaves the bottom of the contact groove 234, the mounting ring 231 will move to the right under the action of the return spring 261. This allows the mounting ring 231 to swing back and forth about the shaft pin above the mounting ring 231 as the axis, and it can collide with the impact plate 25 each time. This causes the fine dust adhering to the filter cloth 232 to vibrate, at which point the dust may temporarily detach from the filter cloth 232, and some of the dust will form larger dust particles. Under the action of its own gravity, it will fall onto the contact base 24 and the lower slide plate 235. Since the upper end of the lower slide plate 235 is movably connected to the air intake hood 22 by a pivot pin, and the upper end of the telescopic rod 263 is provided with an impact plate 262, which passes through the sliding hole and is placed above it, when the telescopic rod 263 moves back and forth, the impact plate 262 will move back and forth with it, thereby causing the impact plate 262 to impact the lower slide plate 235, causing the lower slide plate 235 to vibrate. The dust on the lower slide plate 235 will fall onto the contact base 24. When the mounting ring 231 moves to the left, the cleaning strip 237 below the mounting ring 231 will push the dust into the collection hole 27 for collection. Afterwards, the user can remove the sealing plug 28 for cleaning.

[0063] By setting an air intake hood 22 and a dust filter assembly 23 inside the rear cover 2, the upper part of the dust filter assembly 23 is movably connected by a shaft pin, and the lower left part is connected to a return spring 261 by a telescopic rod 263. With the help of the push rod 42 on the air intake fan 41, when the air intake fan 41 rotates, the push rod 42 can make the dust filter assembly 23 swing back and forth under the action of the return spring 261 and vibrate to a certain extent, so that the dust attached to the dust filter assembly 23 can be removed from the surface of the filter cloth 232. The movable sliding plate 235 will also vibrate under the action of the telescopic rod 263, so that the dust can slide down to the contact base 24 and finally enter the collection hole 27 for collection under the action of the cleaning strip 237. With the help of the air intake fan 41, the cold air can directly act on the stator 5 and the rotor 6, improving the cooling effect and preventing dust from entering the stator 5 and the rotor 6, thus protecting the stator 5 and the rotor 6.

[0064] As an embodiment of the present invention, please refer to Figure 2 , Figure 3 , Figure 7 , Figure 8 , Figure 9 and Figure 10 The stator 5 includes a stator core 51 and a stator winding 52. The stator core 51 is fixed inside the motor housing 1, and the stator winding 52 is wound inside the stator core 51.

[0065] The rotor 6 includes a rotor disk 61, a permanent magnet 66, a permanent magnet 67, a permanent magnet 68, and a permanent magnet 69. Each rotor disk 61 is provided with multiple permanent magnets 66, 67, 68, and 69. The four rotor disks 61 are connected together.

[0066] The rotor disk 61 has multiple asymmetrically distributed embedding slots 62. Two adjacent embedding slots 62 form a V-shape, and permanent magnet 66 and permanent magnet 69 are respectively installed in the two adjacent embedding slots 62. Draw a longitudinal center line through the center of the rotor disk 61, and then draw the shapes of two embedding slots 62 above the rotor disk 61 (the one on the right is named the N-pole slot, and the one on the left is the S-pole slot). The included angle between the two embedding slots 62 is 84 degrees, and the two embedding slots 62 are symmetrical about the center line. Then, arrange these two embedding slots 62 in a circular array of 5 with the center of the rotor disk 61 as the reference, rotating counterclockwise. The first, second, and third N-pole slots are rotated 5 degrees clockwise with their inward center as the origin, the fourth and fifth N-pole slots are rotated 5 degrees counterclockwise, and all five S-pole slots are rotated 5 degrees counterclockwise. This yields the result shown in the instruction manual. Figure 7 The embedded slots 62 on the rotor disk 61 in the rotor 61 are arranged in a V-shape with permanent magnets 66 and 69, which makes the torque on the rotor 6 approximately sinusoidal. Permanent magnets 66 and 69 are embedded in the rotor 6 in a circumferential distribution in an approximately sinusoidal manner, which makes the torque pulsation small. Furthermore, the multiple permanent magnets 66 and 69 are deflected to a certain extent, so that the magnetic field between the permanent magnet poles of permanent magnet 66 and the two adjacent permanent magnets 69 is not completely symmetrical. This can further reduce the magnetic field harmonics in the permanent magnet synchronous motor, improve the air gap magnetic flux density and radial force of the permanent magnet synchronous motor, and thus reduce the order noise of the permanent magnet synchronous motor.

[0067] The rotor disk 61 has multiple equally spaced oblique arc grooves 63 and 64. Permanent magnets 67 and 68 are respectively installed in oblique arc grooves 63 and 64. The arcs of oblique arc grooves 63 and 64 on the foremost rotor disk 61 are offset three degrees to the right (the groove openings on the outer surface of the rotor disk 61 are oblique lines, and the angle between the oblique lines on the groove openings and their axis is 3 degrees), extending to the second rotor disk 61. The third and fourth rotor disks 61... The inclined arc grooves 63 and 64 are symmetrically arranged with the rear surface of the second rotor disk 61 as the reference plane, and are offset from the inclined arc grooves 63 and 64 on the rotor disk 61. This ensures that the permanent magnets 67 and 68 on the first and second rotor disks 61 are symmetrically distributed with respect to the rear surface of the second rotor disk 61. The axial forces generated by the permanent magnets 67 and 68 cancel each other out, resulting in a combined axial force of zero, thus improving torque pulsation suppression.

[0068] Each rotor disk 61 has multiple annularly distributed connecting holes 65 formed through its front surface, and the multiple connecting holes 65 on the four rotor disks 61 overlap one by one. This reduces the overall weight of the rotor 6 and allows cold air to enter the connecting holes 65, which facilitates the cooling of the rotor 6.

[0069] By combining four rotor disks 61 to form a rotor 6, and setting multiple asymmetrically distributed permanent magnets 66 and 69 on each rotor disk 61, and arranging permanent magnets 66 and 69 in a V-shaped configuration within the rotor disk 61, the torque on the rotor 6 is approximately sinusoidal, resulting in small torque ripple. This also reduces magnetic field harmonics in the permanent magnet synchronous motor, improves the air gap flux density and radial force of the permanent magnet synchronous motor, and, in conjunction with permanent magnets 67 and 68, further enhances the torque ripple suppression effect.

[0070] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A slanted-pole permanent magnet synchronous motor, comprising a motor housing (1), a stator (5), a rotor (6), a rear cover (2), and an output shaft (4), wherein a junction box (7) is provided on the motor housing (1), characterized in that, The stator (5) is fixed inside the motor housing (1), the rear cover (2) is installed on the rear side of the motor housing (1), and the front cover (3) is installed on the front side of the motor housing (1). The output shaft (4) is fixed with a rotor (6). The output shaft (4) is movably installed inside the motor housing (1) through a bearing seat (15) and a rolling bearing. The rightmost end of the output shaft (4) is placed outside the front cover (3). The rotor (6) is movably placed in the inner ring of the stator (5), and there is a gap between the outer ring surface of the rotor (6) and the inner ring of the stator (5); A circular hole is provided on the left side surface of the rear cover (2), and an air intake hood (22) is welded into the circular hole. A baffle plate (223) is integrally provided on the lower right side of the interior of the air intake hood (22). A second dustproof net (222) is provided above the baffle plate (223). A first dustproof net (221) is provided on the left side of the air intake hood (22). The inner diameter of the air intake hood (22) gradually increases from left to right. The airflow of cold air through the air intake hood (22) is small and the speed is slow, which facilitates filtration and makes the dust on the dust filter assembly (23) fall off easily. The rear cover (2) is provided with an upper mounting shaft plate (21) inside, and a dust filter assembly (23) is movably mounted inside the rear cover (2) via the mounting shaft plate (21) and shaft pin. The dust filter assembly (23) includes a mounting ring (231), a filter cloth (232), a contact arc plate (233), a contact groove (234), an impact block (236), and a cleaning strip (237). The filter cloth (232) is disposed inside the mounting ring (231). The contact arc plate (233) is disposed below the right side surface of the mounting ring (231), and the contact groove (234) is disposed inside the contact arc plate (233). The two sides of the contact groove (234) extend outward and communicate with the outside of the contact arc plate (233). The impact block (236) is located on the lower left side of the mounting ring (231), and a cleaning strip (237) is located below the impact block (236). The cleaning strip (237) has an arc-shaped cross section. When the output shaft (4) drives the intake fan (41) to rotate rapidly, the front end of the push rod (42) on the fan blade of the intake fan (41) will move along the contact groove (234) and push the lower part of the mounting ring (231) to move to the left. When the fan blade of the intake fan (41) is at its lowest position, the travel of the mounting ring (231) is at its maximum distance, and the impact block (236) is in contact with the impact strip (25) at this time.

2. The slanted-pole permanent magnet synchronous motor as described in claim 1, characterized in that: An air guide shroud (14) is fixed inside the left side of the motor housing (1), and the bearing seat (15) is fixed inside the air guide shroud (14) by four support rods. The inner diameter of the air guide shroud (14) gradually decreases from left to right, and the rightmost end of the air guide shroud (14) coincides with the inner diameter of the stator (5).

3. The slanted-pole permanent magnet synchronous motor as described in claim 2, characterized in that: The leftmost end of the output shaft (4) passes through the bearing seat (15) and is placed on the left side of the bearing seat (15). An intake fan (41) is installed at the leftmost end of the output shaft (4). A push rod (42) is provided on the left side of the fan blade at the upper end of the intake fan (41), and the left end of the push rod (42) has a hemispherical structure. The front cover (3) has four air outlets arranged in a ring on its surface, and filter cotton is provided on the air outlets; The inner wall of the motor housing (1) is provided with a spiral tube (12) in a spiral shape. The left and right ends of the spiral tube (12) are respectively placed on the upper left and right sides of the motor housing (1) and are respectively connected to the liquid inlet (13) and the liquid outlet (11). By introducing coolant into the spiral tube (12), the stator (5) can be cooled quickly.

4. A slanted-pole permanent magnet synchronous motor as described in claim 3, characterized in that: An impact strip (25) is provided inside the lower part of the rear cover (2), and the position of the impact strip (25) corresponds to the position of the impact block (236); Multiple telescopic sleeves (26) are fixed on the left side inside the rear cover (2) at equal intervals. A return spring (261) is connected inside the telescopic sleeve (26). The other end of the return spring (261) is connected to the telescopic rod (263). The telescopic rod (263) is placed outside the telescopic sleeve (26) and is connected to the mounting ring (231).

5. A slanted-pole permanent magnet synchronous motor as described in claim 4, characterized in that: The upper end of the telescopic sleeve (26) is provided with a sliding hole, and the upper end of the telescopic rod (263) is provided with an impact plate (262), and the impact plate (262) passes through the sliding hole and is placed outside the telescopic sleeve (26). The air intake hood (22) is movably connected to the lower slide plate (235) by a pivot pin. The lower part of the lower slide plate (235) is in contact with but not connected to the impact strip (25), and the upper end of the impact plate (262) is in contact with but not connected to the top of the lower slide plate (235).

6. A slanted-pole permanent magnet synchronous motor as described in claim 5, characterized in that: The rear cover (2) has a contact base (24) at the bottom inside. The upper surface of the contact base (24) is arc-shaped and the right side is higher than the left side. The upper surface of the contact base (24) is sealed and slidably designed below the outer ring surface of the mounting ring (231). The cleaning strip (237) contacts the upper surface of the contact base (24). The dust on the filter cloth (232) falls onto the contact base (24) as the dust filter assembly (23) swings left and right. When the dust filter assembly (23) swings, the cleaning strip (237) causes the dust to move to the left into the collection hole (27) for collection. The rear cover (2) has a collection hole (27) in the lower left corner, and a sealing plug plate (28) is connected to the collection hole (27). The upper surface of the sealing plug plate (28) is recessed downward to form a collection groove.

7. A slanted-pole permanent magnet synchronous motor as described in claim 1, characterized in that: The stator (5) includes a stator core (51) and a stator winding (52). The stator core (51) is fixed inside the motor housing (1), and the stator winding (52) is wound around the stator core (51). The rotor (6) includes a rotor disk (61), a permanent magnet one (66), a permanent magnet three (67), a permanent magnet four (68) and a permanent magnet two (69). Each rotor disk (61) is provided with a plurality of permanent magnets one (66), permanent magnet three (67), permanent magnet four (68) and permanent magnet two (69). The four rotor disks (61) are connected together.

8. A slanted-pole permanent magnet synchronous motor as described in claim 7, characterized in that: The rotor disk (61) has a plurality of asymmetrically distributed embedding slots (62), two adjacent embedding slots (62) form a V shape, and permanent magnet one (66) and permanent magnet two (69) are respectively provided in the two adjacent embedding slots (62). The rotor disk (61) is provided with a plurality of equally spaced oblique arc grooves one (63) and two oblique arc grooves two (64). Permanent magnet three (67) and permanent magnet four (68) are respectively provided in the oblique arc groove one (63) and two oblique arc grooves two (64). The oblique arc groove one (63) and oblique arc groove two (64) on the frontmost rotor disk (61) are offset three degrees to the right and extend to the second rotor disk (61). The oblique arc groove one (63) and oblique arc groove two (64) of the third and fourth rotor disks (61) are symmetrically arranged with the rear surface of the second rotor disk (61) as the reference plane and the first and second rotor disks (61). Each rotor disk (61) has a plurality of annularly distributed connecting holes (65) formed through its front surface, and the plurality of connecting holes (65) on the four rotor disks (61) overlap one by one.

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