Synchronous motor and compressor

Abstract

The present invention provides a synchronous motor and a compressor. The synchronous motor includes: a rotor core, which includes a rotor punching sheet and a slot, and a magnet is disposed in the slot; and a stator core, which includes an annular yoke and a plurality of salient teeth circumferentially spaced along the center line of the annular yoke. The plurality of salient teeth include a plurality of tooth groups, and each tooth group includes a first tooth and a second tooth arranged in sequence along the rotation direction of the rotor core. The first tooth and the second tooth are wound with in-phase exciting coils; wherein, the maximum width Tw1 of the first tooth is less than the maximum width Tw2 of the second tooth, and 0.4 ≤ Tw1 / Tw2 < 1 is satisfied. By setting the maximum width Tw1 of the first tooth to be less than the maximum width Tw2 of the second tooth, the present invention optimizes the magnetic flux path, can effectively improve the back electromotive force, reduce the copper loss of the winding, and realize a high-output synchronous motor.

Description

Technical Field

[0001] The present invention relates to the technical field of compressors, and in particular, to a synchronous motor and a compressor. Background Art

[0002] In existing rotary direct current variable frequency compressors, in order to ensure the high efficiency of the motor, a permanent magnet built-in motor is usually adopted. Each coil of the stator winding is wound around the stator teeth. Generally, the number of magnetic poles of the magnets fitted on the rotor core and the number of stator slots are in a ratio of 2:3, and the stator teeth and rotor magnetic poles are evenly distributed in the circumferential direction. The disadvantage of this motor structure is that the coil is short-pitched, resulting in a low winding coefficient, which is caused by the existence of a large number of ineffective interlinked magnetic chains between the magnetic flux generated by the permanent magnet and the stator winding. When adopting a near-pole slot matching, due to the further improvement of the winding coefficient, the copper loss of the motor can be effectively reduced, but the pole-slot matching of the motor used in the compressor has approached the limit, and there is a bottleneck in how to further improve the energy efficiency on this basis. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, one aspect of the present invention provides a synchronous motor.

[0005] Another aspect of the present invention provides a compressor.

[0006] In view of this, according to one aspect of the present invention, there is provided a synchronous motor, comprising: a rotor core, which includes a rotor punching sheet and a slot, and a magnet is disposed in the slot; and a stator core, which includes an annular yoke and a plurality of protruding teeth circumferentially spaced along the center line of the annular yoke, the plurality of protruding teeth include a plurality of tooth groups, each tooth group includes a first tooth and a second tooth arranged in sequence along the rotation direction of the rotor core, and in-phase exciting coils are wound on the first tooth and the second tooth; wherein, the maximum width Tw1 of the first tooth is less than the maximum width Tw2 of the second tooth, and 0.4 ≤ Tw1 / Tw2 < 1 is satisfied.

[0007] The synchronous motor proposed by the present invention includes a rotor core and a stator core. The rotor core is provided with slots for inserting magnets. The stator core includes a plurality of salient teeth circumferentially and spaced apart on the inner circumference of the annular yoke. The plurality of salient teeth can be divided into a plurality of tooth groups. Each tooth group is wound with in-phase exciting coils, and any two adjacent tooth groups are wound with out-of-phase exciting coils. By taking the first salient tooth arranged in sequence along the rotation direction of the rotor core in each tooth group as the first tooth, and taking the second salient tooth arranged in sequence along the rotation direction of the rotor core in each tooth group as the second tooth, and setting the maximum width Tw1 of the first tooth and the maximum width Tw2 of the second tooth to satisfy 0.4 ≤ Tw1 / Tw2 < 1, the magnetic flux path is optimized, the back electromotive force can be effectively increased, the copper loss of the winding can be reduced, and a synchronous motor with high output can be realized. Specifically, contrary to the rotation direction of the rotor of the synchronous motor, for two adjacent salient teeth constituting one phase, the magnetic flux density of the salient tooth on the positive side of the rotor rotation direction is greater than that of the salient tooth on the negative side of the rotor rotation direction. That is, the magnetic flux density at the second tooth is greater than that at the first tooth. Therefore, the magnetic flux densities of two adjacent salient teeth constituting the same phase are not uniform, which causes differences in the magnetic flux densities of the salient teeth in each group of adjacent salient teeth in one phase of the synchronous motor. And in the present invention, by making the maximum width Tw1 of the first tooth less than the maximum width Tw2 of the second tooth, the magnetic flux density saturation at the second tooth is reduced, that is, the magnetic flux density of the salient tooth on the positive side of the rotor rotation direction is reduced, which is beneficial to the uniform distribution of the magnetic flux density everywhere, optimizes the magnetic flux path emitted by the permanent magnet, increases the magnetic flux at the second tooth, and thus effectively increases the back electromotive force and improves the performance of the synchronous motor. Specifically, by limiting the maximum width Tw1 of the first tooth and the maximum width Tw2 of the second tooth to satisfy 0.4 ≤ Tw1 / Tw2 < 1, it can be ensured that the back electromotive force is increased by at least 1%, and effectively avoid that the maximum width of the first tooth is too small, less than 0.4 times the width of the second tooth, resulting in extremely uneven magnetic flux density distribution everywhere and affecting the performance of the synchronous motor.

[0008] In addition, the synchronous motor according to the above technical solution provided by the present invention may further have the following additional technical features:

[0009] In the above technical solution, preferably, the slot-pole combination of the synchronous motor is 10 slots and 12 poles or 12 slots and 14 poles.

[0010] In this technical solution, the slot-pole combination of the synchronous motor is preferably 10 slots and 12 poles, or it can also be 12 slots and 14 poles. With the above, the maximum width Tw1 of the first tooth is less than the maximum width Tw2 of the second tooth, and 0.4 ≤ Tw1 / Tw2 < 1 is satisfied, making the synchronous motor not only have a high winding coefficient, but also a high back electromotive force and low winding copper loss, enabling a high-output and high-efficiency synchronous motor. Additionally, the space inside the slots can be increased to accommodate more copper wires, reducing copper loss and further improving efficiency. Specifically, when the slot-pole combination of the synchronous motor is 12 slots and 14 poles, there are 4 salient teeth winding the exciting coil of the same phase, which are divided into 2 tooth groups, each tooth group having 2 salient teeth, and the two tooth groups of the same phase are symmetrically distributed along the center line of the annular yoke.

[0011] In any of the above technical solutions, preferably, the winding direction of the exciting coil on the first tooth is opposite to that of the exciting coil on the second tooth.

[0012] In this technical solution, by setting the winding direction of the exciting coil on the first tooth to be opposite to that of the exciting coil on the second tooth, on the one hand, it is convenient for winding, on the other hand, it can reduce the length of the exciting coil, save costs, and is beneficial to the smooth rotation of the rotor core.

[0013] In any of the above technical solutions, preferably, the magnet is a permanent magnet, and on any horizontal cross-section of the rotor core, the permanent magnets are distributed in a straight line or in a V shape, or the permanent magnet is a tangentially magnetized magnet.

[0014] In this technical solution, the magnet is a permanent magnet, and the permanent magnet can be distributed in a straight line or in a V shape relative to any horizontal cross-section of the rotor core, or it is a tangentially magnetized magnet. When the permanent magnet is distributed in a V shape or is a tangentially magnetized magnet, the magnetic concentration effect is good, the main magnetic flux is higher, the back electromotive force is high, and thus the operating efficiency of the synchronous motor is high. Of course, the permanent magnet can also be a magnet of other shapes, such as a radial and tangential hybrid structure. Preferably, the permanent magnet is a rare earth magnet, a ferrite magnet, or a rare earth and ferrite hybrid magnet.

[0015] In any of the above technical solutions, preferably, when the permanent magnet is distributed in a V shape, the included angle range of the V shape is 90° to 130°.

[0016] In this technical solution, by setting the included angle of the V-shaped distributed permanent magnet between 90° and 130°, the fundamental wave of the back electromotive force can be maximized, the winding copper loss can be reduced, and the operating efficiency of the synchronous motor can be improved. Among them, the permanent magnet is distributed in a V shape, which can be a single V-shaped permanent magnet or two permanent magnets forming a V shape.

[0017] In any of the above technical solutions, preferably, on any horizontal cross-section of the rotor core, the sum of the lengths of the magnets under each pole is bm, the inner diameter of the stator core is Di, and the number of pole pairs on the rotor core is P, where 0.75 ≤ bm × 2P / (π × Di) ≤ 0.9.

[0018] In this technical solution, it is set that on any horizontal cross-section of the rotor core, the sum of the lengths of the magnets under each pole is bm. For example, when each pole contains two magnets, the sum of the lengths of the two magnets is bm, the inner diameter of the stator core is Di, the number of pole pairs on the rotor core is P, and 0.75 ≤ bm × 2P / (π × Di) ≤ 0.9 is satisfied, which can achieve the highest utilization rate of the permanent magnet and the best cost performance, thereby improving the operating efficiency of the synchronous motor.

[0019] In any of the above technical solutions, preferably, the central angle corresponding to the pole crown of the rotor of the synchronous motor is α1, and the pole pitch angle is α2, where α1 / α2 ≥ 0.5.

[0020] In this technical solution, by setting the central angle corresponding to each pole crown of the rotor of the synchronous motor as α1 and the pole pitch angle as α2, where the pole crown is the part with an arc profile located on the outer periphery of the rotor core. In other words, the arcs on both sides of the magnetic pole d-axis form a complete arc with the rotation center as the center, and the central angle corresponding to this complete arc is α1, and it is defined that α1 / α2 ≥ 0.5, which can provide sufficient main magnetic flux, improve the performance of the synchronous motor, and can meet the manufacturing requirements.

[0021] In any of the above technical solutions, preferably, the ratio of the inner diameter Di to the outer diameter Do of the stator core satisfies: 0.52 ≤ Di / Do ≤ 0.57.

[0022] In this technical solution, by setting the ratio of the inner diameter Di to the outer diameter Do of the stator core to satisfy: 0.52 ≤ Di / Do ≤ 0.57, the optimal cost performance can be obtained while meeting the moment of inertia, and the production cost of the synchronous motor can be reduced.

[0023] In any of the above technical solutions, preferably, the rated torque of the synchronous motor is T, the inner diameter of the stator core is Di, and the torque per unit volume of the rotor of the synchronous motor is TPV, which satisfies: 5.18×10 -7 ≤ T × Di -3 × TPV -1 ≤ 1.17×10 -6 ,5 kN·m·m -3 ≤ TPV ≤ 45 kN·m·m -3 ,where the unit of the rated torque T is N·m, the unit of the inner diameter Di is mm, and the unit of the torque per unit volume TPV is kN·m·m -3 。

[0024] In this technical solution, the rated torque of the synchronous motor is T, the inner diameter of the stator core is Di, and the torque per unit volume of the rotor is TPV, and it satisfies 5.18×10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 , where the value range of the torque per unit volume TPV is 5 kN·m·m -3 ≤TPV≤45 kN·m·m -3 , by limiting the value range of the combined variables of the rated torque T of the synchronous motor, the inner diameter Di of the stator core, and the torque per unit volume TPV of the rotor, the synchronous motor can meet the power demand of the compressor. In addition, for the synchronous motor and the compressor using this rotor, the rotor leakage magnetic flux can be effectively reduced, the utilization rate of the permanent magnet can be increased, and the efficiency of the synchronous motor can be improved.

[0025] In any of the above technical solutions, preferably, the radial width W T 1 at the root of the pole shoe at the end of the first tooth is less than the radial width W T 2 at the root of the pole shoe at the end of the second tooth.

[0026] In this technical solution, by setting the radial width W T 1 at the root of the pole shoe at the end of the first tooth to be less than the radial width W T 2 at the root of the pole shoe at the end of the second tooth, where the pole shoe is located at one end of the convex tooth close to the center line of the stator core, draw a radius line of the annular yoke through the point where the pole shoe is connected to the convex tooth, and the length of the radius line extending on the pole shoe is the radial width at the root of the pole shoe, the magnetic flux path is optimized, the back electromotive force can be effectively increased, the copper loss of the winding can be reduced, and a synchronous motor with high output can be realized. Specifically, opposite to the rotation direction of the rotor of the synchronous motor, for two adjacent convex teeth forming a phase, the magnetic density of the convex tooth on the positive side of the rotor rotation direction is greater than the magnetic density of the convex tooth on the negative side of the rotor rotation direction. Therefore, the magnetic density of the adjacent two convex teeth forming the same phase is not uniform, which makes the magnetic density of each convex tooth in a group of adjacent convex teeth in one phase of the synchronous motor different. And in the present invention, by making the radial width W T 1 at the root of the pole shoe at the end of the first tooth less than the radial width W T 2 at the root of the pole shoe at the end of the second tooth, the magnetic density saturation of the whole second tooth is reduced, the magnetic density of the convex tooth on the positive side of the rotor rotation direction is reduced, which is beneficial to the uniform distribution of the magnetic density everywhere, optimizes the magnetic flux path emitted by the permanent magnet, increases the magnetic flux at the second tooth, and thus effectively increases the back electromotive force and improves the performance of the synchronous motor.

[0027] In any of the above technical solutions, preferably, the radial width W TThe radial width W at the pole shoe root of the first tooth end and the second tooth end T 2 satisfies: 0.4 ≤ W T 1 / W T 2 < 1.

[0028] In this technical solution, the radial width W at the pole shoe root of the first tooth end is specifically defined T The radial width W at the pole shoe root of the first tooth end and the second tooth end T 2 satisfies: 0.4 ≤ W T 1 / W T 2 < 1, which can ensure that the magnetic density of each convex tooth is equivalent, effectively avoid the radial width at the pole shoe root of the first tooth end from being too small, resulting in extremely uneven magnetic density distribution everywhere and affecting the performance of the synchronous motor.

[0029] Another aspect of the present invention provides a compressor, including: a synchronous motor according to any one of the above technical solutions.

[0030] The compressor provided by the present invention, due to having the synchronous motor in any one of the above technical solutions, thus has the beneficial effects of any one of the above technical solutions, which will not be elaborated here one by one.

[0031] The additional aspects and advantages of the present invention will become obvious in the following description part, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0033] Figure 1 It shows a partial top view schematic diagram of the stator core of an embodiment of the present invention;

[0034] Figure 2 It shows a partial top view schematic diagram of the stator core of another embodiment of the present invention;

[0035] Figure 3 It shows a comparison diagram of the back electromotive force of the synchronous motor in an embodiment of the present invention and the back electromotive force of the synchronous motor in the related art;

[0036] Figure 4 It shows a top view schematic diagram of the rotor core of an embodiment of the present invention;

[0037] Figure 5 It shows a top view schematic diagram of the rotor core of another embodiment of the present invention;

[0038] Figure 6 It shows a top view schematic diagram of the rotor core of still another embodiment of the present invention;

[0039] Figure 7 The structural schematic diagram of a compressor according to an embodiment of the present invention is shown;

[0040] Among them, Figure 1 、 Figure 2 、 Figures 4 to 7 The correspondence between the reference numerals and the component names in the figure is as follows:

[0041] 10 Stator core, 12 Annular yoke, 14 Protruding teeth, 142 First tooth, 144 Second tooth, 20 Rotor core, 202 Magnet. Specific embodiments

[0042] In order 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 accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

[0043] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention may 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.

[0044] Next, refer to Figures 1 to 7 to describe a synchronous motor and a compressor according to some embodiments of the present invention.

[0045] As Figure 1 shown, an embodiment of an aspect of the present invention provides a synchronous motor, including: a rotor core 20, which includes a rotor punching and a slot, and a magnet 202 is provided in the slot; and a stator core 10, which includes an annular yoke 12 and a plurality of protruding teeth 14 circumferentially spaced along the center line of the annular yoke 12, the plurality of protruding teeth 14 include a plurality of tooth groups, each tooth group includes a first tooth 142 and a second tooth 144 arranged in sequence along the rotation direction of the rotor core 20, and in-phase exciting coils are wound on the first tooth 142 and the second tooth 144; wherein, the maximum width Tw1 of the first tooth 142 is less than the maximum width Tw2 of the second tooth 144, and 0.4 ≤ Tw1 / Tw2 < 1 is satisfied.

[0046] The synchronous motor proposed by the present invention includes a rotor core 20 and a stator core 10. The rotor core 20 is provided with slots for inserting magnets 202. The stator core 10 includes a plurality of salient teeth 14 circumferentially and spaced apart on the inner side of the annular yoke 12. The plurality of salient teeth 14 can be divided into a plurality of tooth groups. Each tooth group is wound with in-phase exciting coils, and any two adjacent tooth groups are wound with out-of-phase exciting coils. By taking the first salient tooth 14 arranged in sequence along the rotation direction of the rotor core 20 in each tooth group as the first tooth 142, and taking the second salient tooth 14 arranged in sequence along the rotation direction of the rotor core 20 in each tooth group as the second tooth 144, and setting the maximum width Tw1 of the first tooth 142 and the maximum width Tw2 of the second tooth 144 to satisfy 0.4 ≤ Tw1 / Tw2 < 1, the magnetic flux path is optimized, the back electromotive force can be effectively increased, the copper loss of the winding can be reduced, and a synchronous motor with high output can be realized. Specifically, opposite to the rotation direction of the rotor of the synchronous motor, for two adjacent salient teeth 14 forming a phase, the magnetic flux density of the salient tooth 14 on the positive side of the rotor rotation direction is greater than that of the salient tooth 14 on the negative side of the rotor rotation direction. Therefore, the magnetic flux densities of two adjacent salient teeth 14 forming the same phase are not uniform, which causes the magnetic flux densities of the salient teeth 14 in each group of adjacent salient teeth 14 in one phase of the synchronous motor to be different. In the present invention, by making the maximum width Tw1 of the first tooth 142 less than the maximum width Tw2 of the second tooth 144, the magnetic flux density saturation of the second tooth 144 is reduced, and the magnetic flux density of the salient tooth 14 on the positive side of the rotor rotation direction is reduced, which is beneficial to the uniform distribution of the magnetic flux density everywhere, optimizes the magnetic flux path emitted by the permanent magnet, increases the magnetic flux at the second tooth 144, and thus effectively increases the back electromotive force and improves the performance of the synchronous motor. Specifically, the maximum width Tw1 of the first tooth 142 and the maximum width Tw2 of the second tooth 144 are limited to satisfy <0.4 ≤ Tw1 / Tw2 < 1>. Refer to Figure 3 It can be seen that the X-axis is the harmonic order of the back electromotive force, and the Y-axis is the line back electromotive force, with the unit of "V". Compared with the related technology, the line back electromotive force of the present invention is increased by at least 1%, effectively avoiding that the maximum width of the first tooth 142 is too small, less than 0.4 times the width of the second tooth 144, which leads to extremely uneven magnetic flux density distribution everywhere and affects the performance of the synchronous motor.

[0047] In an embodiment of the present invention, preferably, the slot-pole combination of the synchronous motor is 10 slots and 12 poles or 12 slots and 14 poles.

[0048] In this embodiment, the slot-pole combination of the synchronous motor is preferably 10 slots and 12 poles, or can also be 12 slots and 14 poles. With the above, the maximum width Tw1 of the first tooth 142 is less than the maximum width Tw2 of the second tooth 144, and 0.4 ≤ Tw1 / Tw2 < 1 is satisfied, so that the synchronous motor not only has a high winding coefficient, but also has a high back electromotive force and low winding copper loss, and a high-output and high-efficiency synchronous motor can be realized; in addition, the space in the slot can also be increased to put more copper wires, reduce the copper loss, and further improve the efficiency. Specifically, when the slot-pole combination of the synchronous motor is 12 slots and 14 poles, there are 4 salient teeth 14 winding the exciting coil of the same phase, which are divided into 2 tooth groups, each tooth group has 2 salient teeth 14, and the two tooth groups of the same phase are symmetrically distributed along the center line of the annular yoke 12.

[0049] In an embodiment of the present invention, preferably, the winding direction of the exciting coil on the first tooth 142 is opposite to the winding direction of the exciting coil on the second tooth 144.

[0050] In this embodiment, by setting the winding direction of the exciting coil on the first tooth 142 to be opposite to the winding direction of the exciting coil on the second tooth 144, on the one hand, it is convenient for winding, on the other hand, the length of the exciting coil can be reduced, the cost can be saved, and it is beneficial to the smooth rotation of the rotor core 20.

[0051] In an embodiment of the present invention, preferably, the magnet 202 is a permanent magnet, and the permanent magnets are arranged in a straight line or in a V shape on any horizontal cross-section of the rotor core 20, or the permanent magnet is a tangentially magnetized magnet.

[0052] In this embodiment, the magnet 202 is a permanent magnet, and the permanent magnets can be arranged in a straight line or in a V shape relative to any horizontal cross-section of the rotor core 20, or are tangentially magnetized magnets. When the permanent magnets are arranged in a V shape or are tangentially magnetized magnets, the magnetic concentration effect is good, the main magnetic flux is higher, the back electromotive force is high, and thus the operating efficiency of the synchronous motor is high. Of course, the permanent magnet can also be a magnet of other shapes, such as a mixed structure of radial and tangential types. Preferably, the permanent magnet is a rare earth magnet, a ferrite magnet, or a mixed magnet of rare earth and ferrite.

[0053] In an embodiment of the present invention, preferably, when the permanent magnets are arranged in a V shape, the included angle range of the V shape is 90° to 130°.

[0054] In this embodiment, by setting the included angle of the V-shaped permanent magnets between 90° and 130°, the maximization of the fundamental wave of the back electromotive force can be achieved, the winding copper loss can be reduced, and the operating efficiency of the synchronous motor can be improved. Among them, the permanent magnets are arranged in a V shape, which can be a single V-shaped permanent magnet or two permanent magnets forming a V shape.

[0055] In an embodiment of the present invention, preferably, as Figure 5 andFigure 6 As shown, on any horizontal cross-section of the rotor core 20, the sum of the lengths of the magnets 202 under each pole is bm, the inner diameter of the stator core 10 is Di, and the number of pole pairs on the rotor core 20 is P, where 0.75 ≤ bm × 2P / (π × Di) ≤ 0.9.

[0056] In this embodiment, it is set that on any horizontal cross-section of the rotor core 20, the sum of the lengths of the magnets 202 under each pole is bm. For example, when each pole contains two magnets 202, as Figure 5 shown, if the length of one of the magnets is set as bm1 and the length of the other magnet is set as bm2, then the sum of the lengths of the two magnets 202, bm = bm1 + bm2, or as Figure 6 shown, at this time each pole has one magnet, and the sum of the lengths of the magnets 202 under each pole, bm, is the length of this magnet. By setting the inner diameter of the stator core 10 as Di and the number of pole pairs on the rotor core 20 as P, and satisfying 0.75 ≤ bm × 2P / (π × Di) ≤ 0.9, the highest utilization rate of the permanent magnet and the best cost performance can be achieved, thereby improving the operating efficiency of the synchronous motor.

[0057] In an embodiment of the present invention, preferably, as Figure 4 shown, the central angle corresponding to the pole crown of the rotor of the synchronous motor is α1, and the pole pitch angle is α2, where α1 / α2 ≥ 0.5.

[0058] In this embodiment, by setting the central angle corresponding to each pole crown of the rotor of the synchronous motor as α1 and the pole pitch angle as α2, where the pole crown is the part with an arc profile located on the outer periphery of the rotor core 20, as Figure 4 shown, the part of the arc profile at A is the pole crown. In other words, the arcs on both sides of the magnetic pole d-axis form a complete arc with the rotation center as the center of the circle, and the central angle corresponding to this complete arc is α1, and it is defined that α1 / α2 ≥ 0.5, which can provide sufficient main magnetic flux, improve the performance of the synchronous motor, and can meet the manufacturing requirements.

[0059] In an embodiment of the present invention, preferably, the ratio of the inner diameter Di to the outer diameter Do of the stator core 10 satisfies: 0.52 ≤ Di / Do ≤ 0.57.

[0060] In this embodiment, by setting the ratio of the inner diameter Di to the outer diameter Do of the stator core 10 to satisfy: 0.52 ≤ Di / Do ≤ 0.57, the best cost performance can be obtained while meeting the moment of inertia, and the production cost of the synchronous motor can be reduced.

[0061] In an embodiment of the present invention, preferably, the rated torque of the synchronous motor is T, the inner diameter of the stator core 10 is Di, and the torque per unit volume of the rotor of the synchronous motor is TPV, and they satisfy: 5.18×10-7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 ,5kN·m·m -3 ≤TPV≤45kN·m·m -3 wherein, the unit of the rated torque T is N·m, the unit of the inner diameter Di is mm, and the unit of the torque per unit volume TPV is kN·m·m -3 。

[0062] In this embodiment, the rated torque of the synchronous motor is T, the inner diameter of the stator core 10 is Di, and the torque per unit volume of the rotor is TPV, and it satisfies 5.18×10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 wherein, the value range of the torque per unit volume TPV is 5kN·m·m -3 ≤TPV≤45kN·m·m -3 By limiting the value range of the combined variables of the rated torque T of the synchronous motor, the inner diameter Di of the stator core 10, and the torque per unit volume TPV of the rotor, the synchronous motor can meet the power requirements of the compressor. In addition, for the synchronous motor and the compressor using this rotor, the rotor leakage flux can be effectively reduced, the utilization rate of the permanent magnet can be increased, and the efficiency of the synchronous motor can be improved.

[0063] In an embodiment of the present invention, preferably, as Figure 2 shown, the radial width W T 1 at the root of the pole shoe at the end of the first tooth 142 is less than the radial width W T 2 at the root of the pole shoe at the end of the second tooth 144.

[0064] In this embodiment, by setting the radial width W T 1 at the root of the pole shoe at the end of the first tooth 142 to be less than the radial width W T2. Among them, the pole shoe is located at one end of the salient tooth 14 close to the center line of the stator core 10. A radius line of the annular yoke 12 is drawn through the point where the pole shoe is connected to the salient tooth 14. The length of the radius line extending on the pole shoe is the radial width at the root of the pole shoe, optimizing the magnetic flux path, effectively improving the back electromotive force, reducing the copper loss of the winding, and realizing a synchronous motor with high output. Specifically, opposite to the rotation direction of the rotor of the synchronous motor, for two adjacent salient teeth 14 forming a phase, the magnetic flux density of the salient tooth 14 on the positive side of the rotor rotation direction is greater than that of the salient tooth 14 on the negative side of the rotor rotation direction. Therefore, the magnetic flux densities of two adjacent salient teeth 14 forming the same phase are not uniform, which makes the magnetic flux densities of the individual salient teeth 14 in a group of adjacent salient teeth 14 in one phase of the synchronous motor different. And in the present invention, by making the radial width W T 1 at the root of the pole shoe at the end of the first tooth 142 less than the radial width W T 2 at the root of the pole shoe at the end of the second tooth 144, the magnetic flux density saturation of the whole second tooth 144 is reduced, the magnetic flux density of the salient tooth 14 on the positive side of the rotor rotation direction is reduced, which is beneficial to the uniform distribution of the magnetic flux density everywhere, optimizes the magnetic flux path emitted by the permanent magnet, increases the magnetic flux at the second tooth 144, and thus effectively improves the back electromotive force and improves the performance of the synchronous motor.

[0065] In an embodiment of the present invention, preferably, the radial width W T 1 at the root of the pole shoe at the end of the first tooth 142 and the radial width W T 2 at the root of the pole shoe at the end of the second tooth 144 satisfy: 0.4 ≤ W T 1 / W T 2 < 1.

[0066] In this embodiment, the radial width W T 1 at the root of the pole shoe at the end of the first tooth 142 and the radial width W T 2 at the root of the pole shoe at the end of the second tooth 144 are specifically limited to satisfy: 0.4 ≤ W T 1 / W T 2 < 1, which can ensure that the magnetic flux densities of the individual salient teeth 14 are equivalent, effectively avoiding the situation that the radial width at the root of the pole shoe at the end of the first tooth 142 is too small, resulting in extremely uneven magnetic flux density distribution everywhere and affecting the performance of the synchronous motor.

[0067] As Figure 7 shown, another aspect embodiment of the present invention provides a compressor, including: a synchronous motor as described in any one of the above embodiments.

[0068] The compressor provided by the present invention, due to having the synchronous motor in any one of the above embodiments, further has the beneficial effects of any one of the above embodiments, which will not be elaborated here one by one.

[0069] In one embodiment of the present invention, preferably, the compressor further includes: a cylinder, a piston, main and auxiliary bearings located at both ends of the cylinder, a crankshaft connected to the cylinder, a first terminal and a second terminal located on the compressor housing, a lead wire connected to the synchronous motor, and an exhaust pipe provided on the compressor housing. The synchronous motor is sleeved on the crankshaft, and terminal posts are respectively provided on the first terminal and the second terminal.

[0070] In the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. Terms such as "mounted", "connected", "connected to", "fixed" and the like should 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. In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments" and the like 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.

[0071] The foregoing is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A synchronous motor, characterized in that, Comprising: A rotor core, which includes rotor punching sheets and slots, and magnets are arranged in the slots; And A stator core, which includes an annular yoke and a plurality of salient teeth circumferentially spaced along the center line of the annular yoke. The plurality of salient teeth include a plurality of tooth groups, each tooth group has 2 salient teeth, and two tooth groups in the same phase are symmetrically distributed along the center line of the annular yoke. Each tooth group includes a first tooth and a second tooth arranged in sequence along the rotation direction of the rotor core, and exciting coils in the same phase are wound on the first tooth and the second tooth; The slot-pole combination of the synchronous motor is 10 slots 12 poles or 12 slots 14 poles; Wherein, the maximum width Tw1 of the first tooth is less than the maximum width Tw2 of the second tooth, and 0.4 ≤ Tw1 / Tw2 < 1 is satisfied; On any horizontal section of the rotor core, the sum of the lengths of the magnets under each pole is bm, the inner diameter of the stator core is Di, and the number of pole pairs on the rotor core is P. Wherein, 0.75 ≤ bm×2P / (π×Di) ≤ 0.9; Wherein, when each pole includes two magnets, the sum of the lengths of the two magnets is bm; when each pole has one magnet, the sum of the lengths of the magnets under each pole bm is the length of the magnet; The radial width W of the pole shoe root at the end of the first tooth is T 1 is smaller than the radial width W at the pole shoe root of the end portion of the second tooth T 2; The radial width W at the root of the pole shoe at the end of the first tooth T 1 and the radial width W at the root of the pole shoe at the end of the second tooth T 2 satisfy: 0.4 ≤ W T 1 / W T 2 < 1 2. The synchronous motor according to claim 1, characterized in that The winding direction of the exciting coil on the first tooth is opposite to the winding direction of the exciting coil on the second tooth.

3. The synchronous motor according to claim 1 or 2, characterized in that The magnet is a permanent magnet, and on any horizontal section of the rotor core, the permanent magnet is arranged in a straight line or in a V shape, or the permanent magnet is a tangentially magnetized magnet.

4. The synchronous motor according to claim 3, characterized in that When the permanent magnet is arranged in a V shape, the included angle range of the V shape is 90° to 130°.

5. The synchronous motor according to claim 1 or 2, characterized in that The central angle corresponding to the pole crown of the rotor of the synchronous motor is α1, and the pole pitch angle is α2, wherein α1 / α2 ≥ 0.

5.

6. The synchronous motor according to claim 1 or 2, characterized in that The ratio of the inner diameter Di to the outer diameter Do of the stator core satisfies: 0.52 ≤ Di / Do ≤ 0.

57.

7. The synchronous motor according to claim 1 or 2, characterized in that The rated torque of the synchronous motor is T, the inner diameter of the stator core is Di, and the torque per unit volume of the rotor of the synchronous motor is TPV, and they satisfy: 5.18×10 -7 ≤T×Di -3 ×TPV -1 ≤1.17×10 -6 , 5 kN·m·m -3 ≤ TPV ≤ 45 kN·m·m -3 , Wherein, the unit of the rated torque T is N·m, the unit of the inner diameter Di is mm, and the unit of the torque per unit volume TPV is kN·m·m -3 .

8. A compressor, characterized in that, Including the synchronous motor according to any one of claims 1 to 7.

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