Permanent Magnet Synchronous Motor and Compressor

Abstract

The present invention provides a permanent magnet synchronous motor and a compressor. The permanent magnet synchronous motor includes: a motor stator, which includes a stator core and a stator winding. The stator core includes a plurality of stator teeth along the circumferential direction. A stator slot is defined between any two adjacent stator teeth. The stator slot is used to accommodate the stator winding wound around the stator teeth; a motor rotor, which is sleeved and cooperated with the motor stator. The motor rotor includes a rotor core and a plurality of permanent magnets. A plurality of slot groups are formed along the circumferential direction of the end face of the rotor core. The plurality of permanent magnets are embedded in the plurality of accommodating grooves. The plurality of stator teeth can be divided into a plurality of tooth groups arranged in sequence according to the rotation direction of the motor rotor. Each tooth group includes a plurality of pairwise adjacent stator teeth. At least one of the plurality of pairwise adjacent stator teeth is wound with a different-phase winding. Through the technical solution of the present invention, the back electromotive force of the stator winding can be increased during the operation of the motor, thereby reducing the copper loss of the winding and improving the performance of the motor.

Description

Technical Field

[0001] The present invention relates to the field of compressors, and more particularly, to a permanent magnet synchronous motor and a compressor. Background Art

[0002] In a rotary direct current variable frequency compressor, the permanent magnet synchronous motor mostly adopts a permanent magnet motor with a permanent magnet built-in structure, and each coil of the stator winding is wound around the stator teeth.

[0003] In related technologies, by adopting a structural form in which the number of magnetic poles of the magnets in the rotor core and the number of stator slots on the motor stator are 5:6 or 7:6, the permanent magnet synchronous motor has a relatively high winding coefficient, and thus the motor efficiency can be improved. However, the permanent magnets of this structure have the following defects:

[0004] (1) There are space low-order magnetomotive force harmonics of the armature winding in the gap between the motor stator and the motor rotor. Due to the large penetration depth of this kind of harmonic, large eddy current losses will be generated in the motor rotor, resulting in the deterioration of the motor performance.

[0005] (2) The low-order harmonics of the armature magnetic field will also cause uneven distribution of the internal magnetic field of the motor, resulting in local saturation of the motor, thereby reducing the average torque of the motor and increasing the torque ripple, resulting in relatively large vibration noise and deteriorating the user's listening experience. Summary of the Invention

[0006] In order to solve at least one of the above technical problems, an object of the present invention is to provide a permanent magnet synchronous motor.

[0007] Another object of the present invention is to provide a compressor.

[0008] To achieve the above object, an embodiment of the first aspect of the present invention provides a permanent magnet synchronous motor, including: a motor stator, including a stator core and a stator winding, the stator core includes a plurality of stator teeth along the circumference, and a stator slot is defined between any two adjacent stator teeth, and the stator slot is used to accommodate the stator winding wound around the stator teeth; a motor rotor, sleeved and cooperated with the motor stator, the motor rotor includes a rotor core and a plurality of permanent magnets, a plurality of slots are opened on the end face of the rotor core along the circumference of the rotor core, and the plurality of permanent magnets are embedded in the plurality of accommodation grooves. Among them, the plurality of stator teeth can be divided into a plurality of tooth groups arranged in the order of the rotation direction of the motor rotor, each tooth group includes a plurality of adjacent stator teeth, and at least one of the plurality of adjacent stator teeth is wound with a winding belonging to a different phase.

[0009] In this technical solution, multiple stator teeth on the motor stator are divided into multiple tooth groups. The number of tooth groups is determined by the number of stator teeth and the number of phases of the motor, and the winding methods of the stator windings in the multiple tooth groups arranged in the order of the rotation direction of the motor rotor are the same. Different from the winding method in the prior art, in each tooth group, at least one stator tooth is wound with a winding belonging to a different phase, so as to improve the back electromotive force of the permanent magnet synchronous motor winding, thereby reducing the copper loss of the winding and improving the motor performance.

[0010] The permanent magnet synchronous motor in the above-mentioned embodiment provided by the present invention may further have the following additional technical features:

[0011] In the above technical solution, preferably, the multiple stator teeth can be divided into 6 tooth groups arranged in the order of the rotation direction of the motor rotor.

[0012] In the above technical solution, preferably, each tooth group includes a first stator tooth and a second stator tooth. A winding belonging to the same phase is wound on the first stator tooth, and a winding belonging to a different phase is wound on the second stator tooth.

[0013] In this technical solution, the multiple stator teeth are divided into 6 tooth groups to form a multi-phase motor based on the 6 tooth groups and the stator windings wound on the stator teeth. By defining the winding methods of the stator windings on different stator teeth in each tooth group, that is, windings belonging to the same phase and windings belonging to different phases are wound on two stator teeth respectively, combined with the matching motor rotor. On the one hand, the back electromotive force of the stator winding can be improved during operation, thereby reducing the copper loss of the winding and improving the motor performance. On the other hand, it is also beneficial to improve the uniformity of the magnetic field distribution inside the motor to increase the average torque and reduce the torque ripple, thereby reducing the vibration and noise and optimizing the user's listening experience.

[0014] Specifically, taking a three-phase permanent magnet motor as an example, in the corresponding two tooth groups, there are the same winding method and the same phase setting. For example, the winding coil on the first stator tooth of tooth group 1 is one phase, and the winding coil on the second stator tooth belongs to one phase and two phases. The winding coil on the first stator tooth of tooth group 2 is two phases, and the winding coil on the second stator tooth belongs to two phases and three phases. The winding coil on the first stator tooth of tooth group 2 is three phases, and the winding coil on the second stator tooth belongs to three phases and one phase. And the winding method of tooth group 4 is the same as that of tooth group 1, the winding method of tooth group 5 is the same as that of tooth group 3, and the winding method of tooth group 6 is the same as that of tooth group 3, thereby constructing a three-phase permanent magnet motor with improved performance compared with the three-phase motor in the prior art.

[0015] Specifically, when there are 12 stator teeth on the motor stator, each tooth group includes two stator teeth, and the stator winding is wound on the two stator teeth from front to back along the rotation direction of the motor rotor to construct a motor stator that meets the requirements of pole-slot matching.

[0016] In addition, those skilled in the art can also understand that each tooth group includes at least two stator teeth. According to the different numbers of stator teeth on the motor stator, the number of stator teeth in each tooth group is also different. Therefore, it includes more than just the first stator tooth and the second stator tooth.

[0017] In this technical solution, by providing at least damping slots on the stator teeth and combining a specific pole-slot matching scheme formed by a defined ratio between the number of stator slots on the motor stator and the number of poles on the motor rotor, compared with the stator core in the prior art, while being able to improve the motor efficiency, it can effectively suppress the low-order armature magnetomotive force harmonics on the stator winding, thereby improving the medium and low-frequency noise in the motor to achieve the purpose of improving the listening experience.

[0018] The permanent magnet synchronous motor in the above embodiments provided by the present invention may further have the following additional technical features:

[0019] In the above technical solution, preferably, in the same tooth group, the windings on the first stator tooth and the second stator tooth belong to the same phase, and the windings belonging to the same phase are respectively wound on the first stator tooth and the second stator tooth along opposite winding directions.

[0020] In this technical solution, by winding the winding coils of the same phase on the first stator tooth and the second stator tooth in the same tooth group, and the winding directions of the winding coils belonging to the same phase on different stator teeth are opposite, to meet the winding requirements of the stator winding of the motor with the above-mentioned pole-slot matching, thereby achieving the suppression of low-order magnetomotive force harmonics and reducing the rotor eddy current loss.

[0021] In any of the above technical solutions, preferably, the total number of turns of the coils of the windings belonging to the same phase on the first stator tooth is equal to the total number of turns of the coils of the windings belonging to the different phase on the second stator tooth or the total number of turns of the coils of the windings belonging to the same phase on the first stator tooth is not equal to the total number of turns of the coils of the windings belonging to the different phase on the second stator tooth; and / or the number of turns of the corresponding coils of the windings belonging to the different phase on the second stator tooth that do not belong to the same phase are equal or the number of turns of the corresponding coils of the windings belonging to the different phase on the second stator tooth that do not belong to the same phase are not equal.

[0022] In this technical solution, the number of coil turns on the first stator tooth and the number of coil turns on the second stator tooth have the following settings: (1) the total number of turns on the first stator tooth is the same as the total number of turns on the second stator tooth, and the number of turns of the winding coils of different phases on the second stator tooth is the same; (2) the total number of turns on the first stator tooth is the same as the total number of turns on the second stator tooth, but the number of turns of the winding coils of different phases on the second stator tooth is different; (3) the total number of turns on the first stator tooth is different from the total number of turns on the second stator tooth, but the number of turns of the winding coils of different phases on the second stator tooth is the same; (4) the total number of turns on the first stator tooth is different from the total number of turns on the second stator tooth, and the number of turns of the winding coils of different phases on the second stator tooth is different. By setting different winding coil turn settings, the setting requirements of different motor solutions are met.

[0023] In any of the above technical solutions, preferably, the stator tooth includes a yoke portion, a winding tooth portion and a pole shoe portion which are connected to each other in sequence along the radial direction, wherein the radial width of the pole shoe portion on the first stator tooth is W. T 1. Radial width W of the pole shoe on the second stator tooth T 2, 0.4 ≤ W T 1 / W T 2<1.

[0024] In this technical solution, by limiting the ratio between the radial widths of the pole shoe portions on the first stator tooth and the second stator tooth, on the one hand, the special-shaped structure between the first stator tooth and the second stator tooth is achieved, and on the other hand, it is also beneficial to increase the back electromotive force in the winding, thereby reducing winding losses and improving the operating efficiency of the motor.

[0025] In any of the above technical solutions, preferably, the absolute value of the difference between the number of stator slots and the number of poles of the motor rotor is 2 or 1.

[0026] Specifically, the absolute value of the difference between the number of stator slots and the number of poles of the motor rotor is 2, that is, the number of stator slots and the number of poles of the motor rotor are both multiples of 2, and one of them is an odd multiple of 2, and the other is an even multiple of 2.

[0027] In this technical solution, in addition, the specific pole-slot matching scheme is that the greatest common divisor between the number of stator slots and the number of poles of the motor rotor is 2, that is, one of them is an odd multiple of 2, and the other is an even multiple of 2. When using this pole-slot matching, combined with the opened suppression slots, the spatial low-order armature magnetic potential harmonics of the stator winding can be more specifically suppressed, thereby reducing the eddy current losses in the motor rotor, so as to achieve the purpose of improving the motor performance.

[0028] Specifically, the stator slots and the number of poles of the motor rotor may be matched in a manner of 10 poles and 12 slots, 14 poles and 12 slots, or 16 poles and 18 slots.

[0029] In addition, the difference between the number of stator slots and the number of poles of the motor rotor is 1.

[0030] Specifically, the matching mode between the stator slots and the number of poles of the motor rotor can be 8 poles and 9 slots, 10 poles and 9 slots, etc.

[0031] In any of the above technical solutions, preferably, an insulating material can be arranged between two adjacent windings belonging to different phases, and the insulating material is used to isolate the two adjacent windings belonging to different phases.

[0032] In this technical solution, according to the isolation requirements, an insulating material can be arranged between two adjacent windings belonging to different phases, or an insulating material can not be arranged. For the second stator tooth, by arranging a circumferentially protruding slot insulation structure, the two sets of coils belonging to different phases are separated, so as to realize the function of insulation between different phases and prevent the winding coils belonging to different phases on the same stator tooth from interfering with each other.

[0033] Among them, the insulating material can be soft slot insulation or a hard insulating sleeve.

[0034] Specifically, the insulating material can be arranged on one side of the second stator tooth, or the insulating material can be arranged on both sides of the second stator tooth.

[0035] In any of the above technical solutions, preferably, the magnetic poles of the motor rotor are formed by any one of a radial straight permanent magnet, a tangential straight permanent magnet, and a radial V-shaped permanent magnet.

[0036] In this technical solution, the permanent magnet can be a radial straight permanent magnet, a tangential straight permanent magnet or a V-shaped permanent magnet. Among them, adopting a V-shaped magnetic pole or a tangential permanent magnet can achieve a magnetic concentration effect, so as to improve the main magnetic flux, and further increase the back electromotive force, so as to achieve the purpose of improving the operating efficiency of the motor.

[0037] In any of the above technical solutions, preferably, the inner diameter of the stator core is D i , the rated torque of the permanent magnet synchronous motor is T, and the torque per unit volume of the motor rotor is T PV , where 5.18×10 -7 ≤T×D i -3 ×T PV -1 ≤1.17×10 -6 , the unit of T is N·m, the unit of D i is mm, and the unit of T PV is kN·m·m -3 , and the value range of T PV is 5 kN·m·m -3 ≤T PV≤45 kN·m·m -3 。

[0038] In this technical solution, by defining the rated torque of the permanent magnet synchronous motor as T, the inner diameter D of the stator core i and the torque per unit volume T of the rotor PV of the combined variable value range, combined with the limitation of the value range of the torque per unit volume T PV , on the one hand, it can enable the permanent magnet synchronous motor to meet the power requirements in the compressor application field. On the other hand, for the permanent magnet motor and its compressor using the motor rotor and motor stator, it can also effectively reduce the rotor magnetic leakage, increase the utilization rate of the permanent magnets on the rotor core, and thus improve the motor efficiency.

[0039] An embodiment of the second aspect of the present invention provides a compressor, including a permanent magnet synchronous motor according to any one of the embodiments of the first aspect of the present invention.

[0040] One or more technical solutions provided in the technical solutions of the present application have at least the following technical effects or advantages:

[0041] (1) By defining the winding method of the stator windings on different stator teeth in each tooth group, that is, windings belonging to the same phase and windings belonging to different phases are respectively wound on two stator teeth, combined with the matching motor rotor, on the one hand, the back electromotive force of the stator windings can be increased during operation, thereby reducing the copper loss of the windings and improving the motor performance. On the other hand, it is also beneficial to improve the uniformity of the magnetic field distribution inside the motor to increase the average torque and reduce the torque ripple, thereby reducing the vibration and noise and optimizing the user's listening experience.

[0042] (2) By defining the rated torque of the permanent magnet synchronous motor as T, the inner diameter D of the stator core i and the torque per unit volume T of the rotor PV of the combined variable value range, combined with the limitation of the value range of the torque per unit volume T PV , on the one hand, it can enable the permanent magnet synchronous motor to meet the power requirements in the compressor application field. On the other hand, for the permanent magnet motor and its compressor using the motor rotor and motor stator, it can also effectively reduce the rotor magnetic leakage, increase the utilization rate of the permanent magnets on the rotor core, and thus improve the motor efficiency.

[0043] The additional aspects and advantages of the present invention will become apparent in the following description section or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0045] Figure 1 Shows a structural schematic diagram of a motor stator according to an embodiment of the present invention;

[0046] Figure 2 Shows a partial structural schematic diagram of a motor stator according to an embodiment of the present invention;

[0047] Figure 3 Shows a partial structural schematic diagram of a motor stator according to another embodiment of the present invention;

[0048] Figure 4 Shows a comparison schematic diagram of the armature magnetomotive force space harmonic orders when using double-layer windings and multi-layer windings respectively;

[0049] Figure 5 Shows a structural schematic diagram of a compressor according to an embodiment of the present invention;

[0050] Wherein, Figures 1 to 5 The corresponding relationship between the reference numerals in the drawings and the component names is as follows:

[0051] 1 Permanent magnet synchronous motor, 10 Motor stator, 102 Stator core, 104 Stator winding, 1022 First stator tooth, 1024 Second stator tooth, 106 Insulating material, 2 Compression mechanism, 3 Sealed housing. Detailed implementation manners

[0052] In order to be able to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0053] Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0054] The following refers to Figures 1 to 3 Describe a permanent magnet synchronous motor according to some embodiments of the present invention.

[0055] As Figures 1 to 3As shown, the permanent magnet synchronous motor 1 according to an embodiment of the present invention includes: a motor stator 10, including a stator core 102 and a stator winding 104. The stator core 102 includes a plurality of stator teeth in the circumferential direction. A stator slot is defined between any two adjacent stator teeth. The stator slot is used to accommodate the stator winding 104 wound around the stator teeth; a motor rotor, sleeved and cooperated with the motor stator 10. The motor rotor includes a rotor core and a plurality of permanent magnets. A plurality of slot groups are formed in the end face of the rotor core along the circumferential direction of the rotor core, so that a plurality of permanent magnets are embedded in the plurality of accommodating grooves. Among them, the plurality of stator teeth can be divided into a plurality of tooth groups arranged in sequence according to the rotation direction of the motor rotor. Each tooth group includes a plurality of pairwise adjacent stator teeth. At least one of the plurality of pairwise adjacent stator teeth is wound with a winding belonging to a different phase.

[0056] In this embodiment, the plurality of stator teeth on the motor stator are divided into a plurality of tooth groups. The number of tooth groups is determined by the number of stator teeth and the number of phases of the motor. And the winding arrangement of the stator winding 104 in the plurality of tooth groups arranged in sequence according to the rotation direction of the motor rotor is the same. Different from the winding arrangement in the prior art, by having at least one stator tooth in each tooth group wound with a winding belonging to a different phase, the back electromotive force of the winding of the permanent magnet synchronous motor is improved, thereby reducing the copper loss of the winding and improving the performance of the motor.

[0057] In the above embodiment, preferably, the plurality of stator teeth can be divided into 6 tooth groups arranged in sequence according to the rotation direction of the motor rotor.

[0058] In the above embodiment, preferably, each tooth group includes a first stator tooth 1022 and a second stator tooth 1024. A winding belonging to the same phase is wound on the first stator tooth 1022, and a winding belonging to a different phase is wound on the second stator tooth 1024.

[0059] In this embodiment, the plurality of stator teeth are divided into 6 tooth groups to form a multi-phase motor based on the 6 tooth groups and the stator winding 104 wound around the stator teeth. By defining the winding arrangement of the stator winding 104 on different stator teeth in each tooth group, that is, a winding belonging to the same phase and a winding belonging to a different phase are respectively wound on two stator teeth, combined with the cooperating motor rotor. On the one hand, the back electromotive force of the stator winding 104 can be improved during operation, thereby reducing the copper loss of the winding and improving the performance of the motor. On the other hand, it is also beneficial to improve the uniformity of the magnetic field distribution inside the motor to increase the average torque and reduce the torque ripple, thereby reducing the vibration and noise and optimizing the user's listening experience.

[0060] As Figure 1As shown, specifically, taking a three-phase permanent magnet motor as an example, in the corresponding two tooth groups, there are the same winding methods and the same phase settings. For example, the winding coil on the first stator tooth 1022 of tooth group 1 is one phase, and the winding coil on the second stator tooth 1024 belongs to one phase and two phases. The winding coil on the first stator tooth 1022 of tooth group 2 is two phases, and the winding coil on the second stator tooth 1024 belongs to two phases and three phases. The winding coil on the first stator tooth 1022 of tooth group 2 is three phases, and the winding coil on the second stator tooth 1024 belongs to three phases and one phase. Tooth group 4 has the same winding method as tooth group 1, tooth group 5 has the same winding method as tooth group 3, and tooth group 6 has the same winding method as tooth group 3. Thus, a three-phase permanent magnet motor with improved performance compared to the three-phase motor in the prior art is constructed.

[0061] In this embodiment, when there are 12 stator teeth on the motor stator 10, each tooth group includes two stator teeth. The stator winding 104 is wound around two stator teeth from front to back along the rotation direction of the motor rotor to construct a motor stator 10 that meets the pole-slot matching requirements.

[0062] In addition, those skilled in the art can also understand that each tooth group includes at least two stator teeth. According to the different numbers of stator teeth on the motor stator 10, the number of stator teeth in each tooth group is also different. Therefore, it includes not only the first stator tooth 1022 and the second stator tooth 1024.

[0063] In this embodiment, by opening at least suppression slots on the stator teeth and combining with a specific pole-slot matching scheme formed by a limited ratio between the number of stator slots on the motor stator 10 and the number of poles on the motor rotor, compared with the stator core 102 in the prior art, while being able to improve the motor efficiency, it can effectively suppress the low-order armature magnetomotive force harmonics on the stator winding 104, and then improve the medium and low-frequency noise in the motor to achieve the purpose of improving the listening experience.

[0064] As Figure 1 shown, in the above embodiment, preferably, in the same tooth group, the first stator tooth 1022 and the second stator tooth 1024 have windings belonging to the same phase, and the windings belonging to the same phase are respectively wound around the first stator tooth 1022 and the second stator tooth 1024 along opposite winding directions.

[0065] In this embodiment, by winding the winding coils of the same phase on the first stator tooth 1022 and the second stator tooth 1024 in the same tooth group, and the winding directions of the winding coils of the same phase on different stator teeth are opposite, to meet the winding requirements of the stator winding 104 of the motor with the above-mentioned pole-slot matching, and then achieve the suppression of low-order magnetomotive force harmonics and the reduction of rotor eddy current losses.

[0066] In any of the above embodiments, preferably, the total number of turns of the coils in the windings belonging to the same phase on the first stator tooth is equal to the total number of turns of the coils in the windings belonging to the different phases on the second stator tooth, or the total number of turns of the coils in the windings belonging to the same phase on the first stator tooth is not equal to the total number of turns of the coils in the windings belonging to the different phases on the second stator tooth; and / or the number of turns of the corresponding coils in the windings belonging to the different phases on the second stator tooth that do not belong to the same phase is equal, or the number of turns of the corresponding coils in the windings belonging to the different phases on the second stator tooth that do not belong to the same phase are not equal.

[0067] In this embodiment, the number of coil turns on the first stator tooth and the number of coil turns on the second stator tooth have the following settings: (1) the total number of turns on the first stator tooth is the same as the total number of turns on the second stator tooth, and the number of turns of the winding coils of different phases on the second stator tooth is the same; (2) the total number of turns on the first stator tooth is the same as the total number of turns on the second stator tooth, but the number of turns of the winding coils of different phases on the second stator tooth is different; (3) the total number of turns on the first stator tooth is different from the total number of turns on the second stator tooth, but the number of turns of the winding coils of different phases on the second stator tooth is the same; (4) the total number of turns on the first stator tooth is different from the total number of turns on the second stator tooth, and the number of turns of the winding coils of different phases on the second stator tooth is different. By setting different winding coil turn settings, the setting requirements of different motor solutions are met.

[0068] In any of the above embodiments, preferably, the stator tooth includes a yoke portion, a winding tooth portion and a pole shoe portion which are connected to each other in sequence along the radial direction, wherein the radial width of the pole shoe portion on the first stator tooth 1022 is W T 1. Radial width W of the pole shoe portion on the second stator tooth 1024 T 2, 0.4 ≤ W T 1 / W T 2<1.

[0069] In this embodiment, by limiting the ratio between the radial widths of the pole shoe portions on the first stator tooth 1022 and the second stator tooth 1024, on the one hand, the special-shaped structure between the first stator tooth 1022 and the second stator tooth 1024 is achieved, and on the other hand, it is also beneficial to increase the back electromotive force in the winding, thereby reducing winding losses and improving the operating efficiency of the motor.

[0070] In any of the above embodiments, preferably, the absolute value of the difference between the number of stator slots and the number of poles of the motor rotor is 2 or 1.

[0071] Specifically, the absolute value of the difference between the number of stator slots and the number of poles of the motor rotor is 2, that is, the number of stator slots and the number of poles of the motor rotor are both multiples of 2, and one of them is an odd multiple of 2, and the other is an even multiple of 2.

[0072] In this embodiment, in addition, the specific pole-slot matching scheme is specifically that the greatest common divisor between the number of stator slots and the number of poles of the motor rotor is 2, that is, one of them is an odd multiple of 2 and the other is an even multiple of 2. When using this pole-slot combination, combined with the opened suppression slots, the spatial low-order armature magnetomotive force harmonics of the stator winding 104 can be more targeted suppressed, thereby reducing the eddy current loss in the motor rotor, so as to achieve the purpose of improving the motor performance.

[0073] Specifically, the matching method between the stator slots and the number of poles of the motor rotor can be 10 poles and 12 slots, 14 poles and 12 slots, or 16 poles and 18 slots, etc.

[0074] In addition, the difference between the number of stator slots and the number of poles of the motor rotor is 1.

[0075] Specifically, the matching method between the stator slots and the number of poles of the motor rotor can be 8 poles and 9 slots or 10 poles and 9 slots, etc.

[0076] Such as Figure 2 And Figure 3 As shown, in any of the above embodiments, preferably, an insulating material can be provided between two adjacent windings belonging to different phases, and the insulating material is used to isolate two adjacent windings belonging to different phases.

[0077] In this embodiment, according to the isolation requirements, an insulating material can be provided between two adjacent windings belonging to different phases, or an insulating material can not be provided. For the second stator tooth 1024, by providing a circumferentially protruding insulating material 106, the two sets of coils belonging to different phases are separated, thereby realizing the function of insulation between different phases and preventing the winding coils belonging to different phases on the same stator tooth from interfering with each other.

[0078] Among them, the slot insulation structure 106 is specifically a soft slot insulation or a hard insulating sleeve for the different-phase part.

[0079] Specifically, as Figure 2 As shown, an insulating material 106 can be provided on one side of the second stator tooth, or as Figure 3 As shown, insulating materials 106 are provided on both sides of the second stator tooth.

[0080] In any of the above embodiments, preferably, the magnetic poles of the motor rotor are formed by any one of a radial one-shaped permanent magnet, a tangential one-shaped permanent magnet, and a radial V-shaped permanent magnet.

[0081] In this embodiment, the permanent magnet can be a radial one-shaped permanent magnet, a tangential one-shaped permanent magnet, or a V-shaped permanent magnet. Among them, adopting a V-shaped magnetic pole or a tangential permanent magnet can achieve a magnetic concentration effect, thereby improving the main magnetic flux and further increasing the back electromotive force, so as to achieve the purpose of improving the motor operation efficiency.

[0082] In any of the above embodiments, preferably, the sum of the widths of the permanent magnets in each magnetic pole is B m , the inner diameter of the stator core 102 is D i , the number of pole pairs of the motor rotor is P, where 0.75 ≤ B m × 2P / (π × D i ) ≤ 0.9.

[0083] In this embodiment, by defining the numerical range among the width of the permanent magnet, the inner diameter of the stator core, and the number of pole pairs of the motor rotor, so that the width of the permanent magnet and the number of pole pairs satisfy this range, the highest utilization rate of the permanent magnet and the best cost performance can be achieved.

[0084] Figure 4 shows a comparison diagram of the armature magnetomotive force space harmonic orders when using double-layer windings and multi-layer windings respectively. As Figure 4 shown, when winding the stator winding using the winding method in the present application, the 5th harmonic component represents the fundamental wave to generate a constant torque. As Figure 4 shown, using the winding method of the present application can reduce the space low-order magnetomotive force harmonics of the armature winding, so as to reduce the eddy current loss and improve the motor performance.

[0085] In any of the above embodiments, preferably, the rated torque of the permanent magnet synchronous motor is T, and the torque per unit volume of the motor rotor is T PV , where 5.18 × 10 -7 ≤ T × D i -3 × T PV -1 ≤ 1.17 × 10 -6 , the unit of T is N·m, the unit of D i is mm, the unit of T PV is kN·m·m -3 , the value range of T PV is 5 kN·m·m -3 ≤ T PV ≤ 45 kN·m·m -3 .

[0086] In this embodiment, by defining the value range of the combined variables of the rated torque T of the permanent magnet synchronous motor, the inner diameter D of the stator core i and the torque per unit volume T of the rotor PV , combined with the torque per unit volume T PVThe limitation of the value range can, on the one hand, enable the permanent magnet synchronous motor to meet the power requirements in the compressor application field. On the other hand, for the permanent magnet motor and its compressor using the motor rotor and motor stator, it can also effectively reduce the rotor leakage flux, increase the utilization rate of the permanent magnets on the rotor core, and thus improve the motor efficiency.

[0087] As Figure 5 shown, the compressor according to an embodiment of the present invention includes a permanent magnet synchronous motor 1, a compression mechanism 2, and a sealed housing 3 proposed in the above embodiment.

[0088] In the present invention, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", and "fixed" should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0089] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention.

[0090] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0091] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A permanent magnet synchronous motor, characterized in that, Comprising: A motor stator, including a stator core and a stator winding. The stator core includes a plurality of stator teeth in the circumferential direction. Any two adjacent stator teeth define a stator slot therebetween, and the stator slot is used to accommodate the stator winding wound around the stator teeth; A motor rotor, sleeved and cooperated with the motor stator. The motor rotor includes a rotor core and a plurality of permanent magnets. A plurality of slot groups are formed on the end face of the rotor core along the circumferential direction of the rotor core, and the plurality of permanent magnets are embedded in the plurality of accommodating grooves; Wherein, the plurality of stator teeth can be divided into a plurality of tooth groups arranged in sequence according to the rotation direction of the motor rotor. Each tooth group includes a plurality of pairwise adjacent stator teeth, and at least one of the plurality of pairwise adjacent stator teeth is wound with a winding belonging to a different phase; Each tooth group includes a first stator tooth and a second stator tooth. A winding belonging to the same phase is wound on the first stator tooth, and a winding belonging to a different phase is wound on the second stator tooth; In the same tooth group, the first stator tooth and the second stator tooth have windings belonging to the same phase, and the windings belonging to the same phase are wound on the first stator tooth and the second stator tooth respectively along opposite winding directions.

2. The permanent magnet synchronous motor according to claim 1, characterized in that, The plurality of stator teeth can be divided into 6 tooth groups arranged in sequence according to the rotation direction of the motor rotor.

3. The permanent magnet synchronous motor according to claim 1, characterized in that, The total number of turns of the coils of the winding belonging to the same phase on the first stator tooth is equal to the total number of turns of the coils of the winding belonging to a different phase on the second stator tooth, or the total number of turns of the coils of the winding belonging to the same phase on the first stator tooth is not equal to the total number of turns of the coils of the winding belonging to a different phase on the second stator tooth; And / or The number of turns of the coils of the windings belonging to different phases in the winding belonging to a different phase on the second stator tooth is equal, or the number of turns of the coils of the windings belonging to different phases in the winding belonging to a different phase on the second stator tooth is not equal.

4. The permanent magnet synchronous motor according to claim 1, characterized in that, The stator tooth sequentially includes a yoke portion, a winding tooth portion and a pole shoe portion connected to each other in the radial direction, Among them, the radial width of the pole shoe portion on the first stator tooth is W T1 , and the radial width W of the pole shoe portion on the second stator tooth T2 , 0.4 ≤ W T1 / W T2 < 1 5. The permanent magnet synchronous motor according to claim 1, characterized in that, The absolute value of the difference between the number of stator slots and the number of poles of the motor rotor is 2 or 1.

6. The permanent magnet synchronous motor according to claim 1, characterized in that, An insulating substance can be arranged between two adjacent windings belonging to different phases, and the insulating substance is used to isolate the two adjacent windings belonging to different phases.

7. The permanent magnet synchronous motor according to any one of claims 1 to 6, characterized in that, The inner diameter of the stator core is D i , the rated torque of the permanent magnet synchronous motor is T, and the torque per unit volume of the motor rotor is , Among them, 5.18× ≤T× × ≤1.17× , the unit of the said T is N·m, the unit is mm, the unit is kN·m· , the value range is 5 kN·m· ≤ ≤45 kN·m· .

8. A compressor, characterized in that, Comprising: The permanent magnet synchronous motor according to any one of claims 1 to 7.

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