CN110875677A - Synchronous motors and compressors - Google Patents

Abstract

The invention provides a synchronous motor and a compressor, wherein the synchronous motor includes: a rotor iron core, which includes a rotor punch and a slot, and a magnet is arranged in the slot; and a stator iron core, which includes an annular yoke and a flange. A plurality of protruding teeth distributed at intervals on the center line of the annular yoke, the plurality of protruding 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 excitation coils in the same phase; wherein, the maximum width Tw1 of the first tooth is smaller than the maximum width Tw2 of the second tooth, and 0.4≤Tw1/Tw2<1. By setting the maximum width Tw1 of the first tooth to be smaller than the maximum width Tw2 of the second tooth, the invention optimizes the magnetic flux path, can effectively increase the back EMF, reduce the copper loss of the winding, and realize a high-output synchronous motor.

Description

Synchronous motors and compressors

technical field

The present invention relates to the technical field of compressors, in particular to a synchronous motor and a compressor.

Background technique

In the existing rotary DC variable frequency compressor, in order to ensure the high efficiency of the motor, a permanent magnet built-in motor is usually used. Each coil of the stator winding is wound on the stator teeth. The number is generally 2:3, and the stator teeth and rotor magnetic poles are equally spaced on the circumference. The disadvantage of this motor structure is that the winding coefficient is low due to the short distance between the coils, which is caused by the existence of many invalid flux linkages between the magnetic flux generated by the permanent magnets and the stator windings. When the close-pole slot fit is used, the copper consumption of the motor can be effectively reduced due to the further improvement of the winding coefficient. However, the motor pole-slot fit used in the compressor is approaching the limit, and there is a technical bottleneck on how to further improve the energy efficiency on this basis. .

SUMMARY OF THE INVENTION

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

To this end, one aspect of the present invention proposes a synchronous machine.

Another aspect of the present invention provides a compressor.

In view of this, according to one aspect of the present invention, there is provided a synchronous motor, comprising: a rotor iron core, which includes a rotor punch and a slot, and a magnet is arranged in the slot; and a stator iron core, which includes a ring yoke and a plurality of protruding teeth spaced circumferentially along the centerline of the annular yoke, the protruding 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. Two teeth, the first and second teeth are wound with excitation coils in the same phase; wherein, the maximum width Tw1 of the first tooth is smaller than the maximum width Tw2 of the second tooth, and 0.4≤Tw1/Tw2<1.

The synchronous motor proposed by the present invention includes a rotor iron core and a stator iron core. The rotor iron core is provided with a slot for inserting a magnet. The convex teeth can be divided into multiple tooth groups, each tooth group is wound with the same-phase excitation coil, and any two adjacent tooth groups are wound with different-phase excitation coils. The first protruding tooth arranged sequentially in the rotation direction of the rotor core is taken as the first tooth, the second protruding tooth arranged in sequence along the rotation direction of the rotor core in each tooth group is taken as the second tooth, and the first tooth is set. The maximum width Tw1 of the second tooth and the maximum width Tw2 of the second tooth satisfy 0.4≤Tw1/Tw2<1, which optimizes the magnetic flux path, effectively increases the back EMF, reduces the copper consumption of the winding, and realizes a high-output synchronous motor. Specifically, as opposed to the rotation direction of the rotor of the synchronous motor, among the two adjacent protruding teeth forming a phase, the magnetic density of the protruding teeth on the positive side of the rotor rotation direction is greater than that of the protruding teeth on the opposite side of the rotor rotation direction. The magnetic density of the tooth is equivalent to that the magnetic density at the second tooth is greater than the magnetic density at the first tooth, so the magnetic density of the adjacent two convex teeth that form the same phase is not uniform, which makes the adjacent one phase of the synchronous motor adjacent to each other. There is a difference in the magnetic density of each convex tooth in a group of convex teeth, and the present invention reduces the magnetic density saturation of the second tooth by making the maximum width Tw1 of the first tooth smaller than the maximum width Tw2 of the second tooth, that is, reducing the magnetic density saturation of the second tooth. The magnetic density of the convex teeth on the positive side of the rotor rotation direction is reduced, which is beneficial to the uniform magnetic density distribution everywhere, optimizes the magnetic flux path emitted by the permanent magnet, and increases the magnetic flux at the second tooth, thereby effectively improving the back EMF. , to improve the performance of the synchronous motor. Specifically, the maximum width Tw1 of the first tooth and the maximum width Tw2 of the second tooth are defined to satisfy 0.4≤Tw1/Tw2<1, which can ensure that the back EMF is increased by at least 1%, and effectively prevent the maximum width of the first tooth from being too small, less than 0.4 times the width of the second tooth, resulting in extremely uneven distribution of magnetic density everywhere, affecting the performance of the synchronous motor.

In addition, the synchronous motor in the above-mentioned technical solution provided by the present invention may also have the following additional technical features:

In the above technical solution, preferably, the slot-pole matching of the synchronous motor is 10 slots with 12 poles or 12 slots with 14 poles.

In this technical solution, the slot-pole matching of the synchronous motor is preferably 10 slots and 12 poles, or 12 slots and 14 poles. The maximum width Tw1 of the first tooth is smaller than the maximum width Tw2 of the second tooth, and 0.4≤Tw1 /Tw2<1, so that the synchronous motor not only has a high winding coefficient, but also has a high back EMF and low winding copper consumption, which can realize a high-output and efficient synchronous motor; in addition, it can also increase the space in the slot and put more Copper wire, reduce copper consumption and further improve efficiency. Specifically, when the slot-pole matching of the synchronous motor is 12 slots and 14 poles, there are 4 protruding teeth wound around the excitation coil of the same phase, which are divided into 2 tooth groups, each tooth group has 2 protruding teeth, and the two protruding teeth in the same phase The tooth groups are symmetrically distributed along the center line of the annular magnetic yoke.

In any of the above technical solutions, preferably, the winding direction of the excitation coil on the first tooth is opposite to the winding direction of the excitation coil on the second tooth.

In this technical solution, by setting the winding direction of the excitation coil on the first tooth to be opposite to the winding direction of the excitation coil on the second tooth, on the one hand, the winding is convenient, and on the other hand, the length of the excitation coil can be reduced , cost saving, and is conducive to the stable rotation of the rotor core.

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

In this technical solution, the magnets are permanent magnets, and the permanent magnets can be distributed in a straight line or in a V shape relative to any horizontal section of the rotor core, or they can be tangentially magnetized magnets. When the permanent magnets are distributed in a V shape or When the magnet is tangentially magnetized, the magnetization effect is good, the main magnetic flux is higher, and the back EMF is high, so that the synchronous motor operates with high efficiency. Of course, the permanent magnets can also be magnets of other shapes, such as a hybrid structure of radial and tangential. Preferably, the permanent magnets are rare earth magnets, ferrite magnets or mixed rare earth and ferrite magnets.

In any of the above technical solutions, preferably, when the permanent magnets are distributed in a V-shape, the included angle of the V-shape ranges from 90° to 130°.

In this technical solution, by setting the included angle of the V-shaped permanent magnets between 90° and 130°, the fundamental wave of the back EMF can be maximized, the copper consumption of the windings can be reduced, and the operation efficiency of the synchronous motor can be improved. Wherein, the permanent magnets are distributed in a V-shape, which can be one V-shaped permanent magnet or two permanent magnets to form a V-shape.

In any of the above technical solutions, preferably, 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 is P, where 0.75≤bm×2P/(π×Di)≤0.9.

In this technical solution, the sum of the lengths of the magnets under each pole on any horizontal section of the rotor core is set to be 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 iron 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 permanent magnets and the best cost performance, thereby improving synchronization The operating efficiency of the motor.

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.

In this technical solution, by setting the central angle corresponding to each pole cap of the rotor of the synchronous motor as α1, and the pole pitch angle as α2, wherein the pole cap is the part with the arc contour located on the outer circumference of the rotor core, In other words, the arcs on both sides of the d-axis of the magnetic pole form an entire arc with the center of rotation as the center. The central angle corresponding to the entire arc is α1, and α1/α2 ≥ 0.5, which can provide enough main magnetic flux , improve the performance of the synchronous motor, and can meet the manufacturing requirements.

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

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

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 , 5kN·m·m ^-3 ≤TPV≤45kN·m·m ^-3 , where the unit of rated torque T is N·m, and the unit of inner diameter Di is mm, and the unit of unit volume torque TPV is kN·m·m ^-3 .

In this technical solution, the rated torque of the synchronous motor is T, the inner diameter of the stator core is Di, the torque per unit volume of the rotor is TPV, and 5.18×10 ^-7 ≤T×Di ^-3 ×TPV ^-1 ≤ 1.17×10 ^-6 , among which, the value range of the torque TPV per unit volume is 5kN·m·m ^-3 ≤TPV≤45kN·m·m ^-3 . By limiting the rated torque T of the synchronous motor, the stator core The value range of the combined variable of the inner diameter Di and the torque per unit volume of the rotor TPV allows the synchronous motor to meet the power requirements of the compressor. In addition, for the synchronous motor and compressor using the rotor, it can effectively reduce the rotor flux leakage , increase the utilization rate of permanent magnets and improve the efficiency of synchronous motors.

In any of the above technical solutions, preferably, the radial width _WT 1 at the root of the pole shoe at the first tooth end is smaller than the radial width _WT 2 at the root of the pole shoe at the second tooth end.

In this technical solution, the radial width W _T1 at the root of the pole piece of the first tooth end is set to be smaller than the radial width W _T2 at the root of the pole piece of the second tooth end, wherein the pole piece is located at The convex teeth are close to one end of the center line of the stator core. Draw a radius line of the annular yoke at the point where the pole piece is connected to the convex tooth. The length of the radius line extending on the pole piece is the radial width at the root of the pole piece. The magnetic flux path can be effectively improved, the back EMF can be effectively improved, the copper loss of the winding can be reduced, and a high-output synchronous motor can be realized. Specifically, as opposed to the rotation direction of the rotor of the synchronous motor, among the two adjacent protruding teeth forming a phase, the magnetic density of the protruding teeth on the positive side of the rotor rotation direction is greater than that of the protruding teeth on the opposite side of the rotor rotation direction. The magnetic density of the teeth is different, so the magnetic density of two adjacent convex teeth that form the same phase is not uniform, which makes the magnetic density of each convex tooth in the adjacent group of convex teeth in one phase of the synchronous motor different, and the present invention By making the radial width _WT 1 at the pole piece root of the first tooth end smaller than the radial width _WT 2 at the pole piece root of the second tooth end, the overall magnetic density saturation of the second tooth is reduced , reducing the magnetic density of the convex teeth on the positive side of the rotor rotation direction, which is beneficial to the uniform distribution of the magnetic density everywhere, optimizes the magnetic flux path emitted by the permanent magnet, and increases the magnetic flux at the second tooth, thereby effectively improving the reverse electric potential to improve the performance of synchronous motors.

In any of the above technical solutions, preferably, the radial width W _T 1 at the root of the pole shoe of the first tooth end and the radial width W _T 2 at the root of the pole shoe of the second tooth end satisfy: 0.4≤ W _T 1 /W _T 2 <1.

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

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

Since the compressor provided by the present invention has the synchronous motor in any of the above technical solutions, it further has the beneficial effects of any of the above technical solutions, which will not be repeated here.

Additional aspects and advantages of the present invention will become apparent in the description section that follows, or will be learned by practice of the present invention.

Description of drawings

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

FIG. 1 shows a partial top plan view of a stator core according to an embodiment of the present invention;

FIG. 2 shows a partial top plan view of a stator core according to another embodiment of the present invention;

FIG. 3 shows a comparison diagram of the back EMF of the synchronous motor according to an embodiment of the present invention and the back EMF of the synchronous motor in the related art;

FIG. 4 shows a schematic plan view of a rotor core according to an embodiment of the present invention;

FIG. 5 shows a schematic plan view of a rotor core according to another embodiment of the present invention;

FIG. 6 shows a schematic top view of a rotor core according to still another embodiment of the present invention;

FIG. 7 shows a schematic structural diagram of a compressor according to an embodiment of the present invention;

Among them, the corresponding relationship between the reference numerals and the component names in Figure 1, Figure 2, Figure 4 to Figure 7 is:

1 synchronous motor, 10 stator core, 12 annular yoke, 14 convex teeth, 142 first teeth, 144 second teeth, 20 rotor cores, 202 magnets, 2 compressors.

Detailed ways

In order to understand the above objects, features and advantages of the present invention more clearly, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments may be combined with each other in the case of no conflict.

Many specific details are set forth in the following description to facilitate a full understanding of 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 details disclosed below. Example limitations.

The synchronous motor 1 and the compressor 2 according to some embodiments of the present invention will be described below with reference to FIGS. 1 to 7 .

As shown in FIG. 1 , an embodiment of an aspect of the present invention provides a synchronous motor 1 , comprising: a rotor core 20 , which includes rotor punches and slots, and magnets 202 are arranged in the slots; and a stator core 10 , which includes an annular yoke 12 and a plurality of protruding teeth 14 spaced along the center line of the annular yoke 12 , the plurality of protruding teeth 14 include a plurality of tooth groups, and each tooth group includes a plurality of tooth groups along the rotor core 20 . The first teeth 142 and the second teeth 144 are arranged in sequence in the rotation direction, and the first teeth 142 and the second teeth 144 are wound with excitation coils in the same phase; wherein, the maximum width Tw1 of the first teeth 142 is smaller than that of the second teeth 144 Maximum width Tw2, and satisfy 0.4≤Tw1/Tw2<1.

The synchronous motor 1 proposed by the present invention includes a rotor iron core 20 and a stator iron core 10 . The rotor iron core 20 is provided with a slot for inserting the magnets 202 . A plurality of convex teeth 14, the plurality of convex teeth 14 can be divided into a plurality of tooth groups, each tooth group is wound with the same-phase excitation coil and any two adjacent tooth groups are wound with different-phase excitation coils. The first protruding teeth 14 in each tooth group sequentially arranged along the rotation direction of the rotor core 20 are used as the first teeth 142 , and the second teeth 14 in each tooth group sequentially arranged along the rotation direction of the rotor core 20 are used as the first teeth 142 . The convex tooth 14 is used as the second tooth 144, and the maximum width Tw1 of the first tooth 142 and the maximum width Tw2 of the second tooth 144 are set to satisfy 0.4≤Tw1/Tw2<1, which optimizes the magnetic flux path and can effectively improve the back EMF, The copper loss of the winding is reduced, and a high-output synchronous motor 1 is realized. Specifically, contrary to the rotation direction of the rotor of the synchronous motor 1, among the two adjacent protruding teeth 14 forming a phase, the magnetic density of the protruding teeth 14 on the positive side of the rotor rotation direction is greater than that on the opposite side of the rotor rotation direction. Therefore, the magnetic densities of the adjacent two convex teeth 14 in the same phase are not uniform, which makes each convex tooth 14 in the adjacent group of convex teeth 14 There are differences in the magnetic density, and the present invention reduces the magnetic density saturation of the second tooth 144 by making the maximum width Tw1 of the first tooth 142 smaller than the maximum width Tw2 of the second tooth 144, and reduces the direction of rotation of the rotor in the positive direction. The magnetic density of the convex teeth 14 on the side is conducive to the uniform distribution of the magnetic density everywhere, optimizes the magnetic flux path emitted by the permanent magnet, and increases the magnetic flux at the second tooth 144, thereby effectively improving the back EMF and improving the performance of the synchronous motor 1 . Specifically, the maximum width Tw1 of the first tooth 142 and the maximum width Tw2 of the second tooth 144 are defined to satisfy 0.4≤Tw1/Tw2<1. Referring to FIG. 3, it can be seen that the X axis is the harmonic order of the back EMF, and the Y axis is the line inverse order. Electric potential, the unit is "V". Compared with the related art, the line back EMF of the present invention is increased by at least 1%, which effectively avoids the maximum width of the first teeth 142 being too small, which is less than 0.4 times the width of the second teeth 144, resulting in each The magnetic density distribution is extremely uneven, which affects the performance of the synchronous motor 1.

In an embodiment of the present invention, preferably, the slot-pole matching of the synchronous motor 1 is 10-slot 12-pole or 12-slot 14-pole.

In this embodiment, the slot-pole fit of the synchronous motor 1 is preferably 10 slots and 12 poles, or 12 slots and 14 poles. The maximum width Tw1 of the first tooth 142 is smaller than the maximum width Tw2 of the second tooth 144 and meets the requirement 0.4≤Tw1/Tw2<1, so that the synchronous motor 1 not only has a high winding coefficient, but also has a high back EMF and low winding copper consumption, which can realize a high-output and efficient synchronous motor 1; in addition, the space in the slot can also be increased. , put more copper wires, reduce copper consumption, and further improve efficiency. Specifically, when the slots and poles of the synchronous motor 1 are matched to 12 slots and 14 poles, there are four protruding teeth 14 wound around the excitation coil of the same phase, which are divided into two tooth groups, and each tooth group has two protruding teeth 14, and The two tooth groups in the same phase are symmetrically distributed along the center line of the annular yoke 12 .

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

In this embodiment, by setting the winding direction of the excitation coil on the first tooth 142 to be opposite to the winding direction of the excitation coil on the second tooth 144, on the one hand, the winding is convenient, and on the other hand, the excitation coil can be reduced in size It can save cost and is beneficial to the stable rotation of the rotor core 20.

In an embodiment of the present invention, preferably, the magnets 202 are permanent magnets, and the permanent magnets are distributed in a straight line or a V shape on any horizontal section of the rotor core 20, or the permanent magnets are tangentially magnetized magnets .

In this embodiment, the magnets 202 are permanent magnets, and the permanent magnets may be distributed in a straight line or a V shape relative to any horizontal section of the rotor core 20, or they may be tangentially magnetized magnets. When the permanent magnets are in a V shape When the magnets are distributed or tangentially magnetized, the magnetization effect is good, the main magnetic flux is higher, and the back EMF is high, so that the synchronous motor 1 has a high operating efficiency. Of course, the permanent magnets can also be magnets of other shapes, such as a hybrid structure of radial and tangential. Preferably, the permanent magnets are rare earth magnets, ferrite magnets or mixed rare earth and ferrite magnets.

In an embodiment of the present invention, preferably, when the permanent magnets are distributed in a V-shape, the included angle of the V-shape ranges from 90° to 130°.

In this embodiment, by setting the included angle of the V-shaped permanent magnets between 90° and 130°, the fundamental wave of the back EMF can be maximized, the copper loss of the windings can be reduced, and the operation efficiency of the synchronous motor 1 can be improved. Wherein, the permanent magnets are distributed in a V-shape, which can be one V-shaped permanent magnet or two permanent magnets to form a V-shape.

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

In this embodiment, the sum of the lengths of the magnets 202 under each pole on any horizontal section of the rotor core 20 is set to be bm. For example, when each pole contains two magnets 202, as shown in FIG. 5 , set The length of one of the magnets is bm1, and the length of the other magnet is bm2, then the sum of the lengths of the two magnets 202 is bm=bm1+bm2, or as shown in FIG. The sum bm of the lengths of the magnets 202 is the length of the magnet. By setting the inner diameter of the stator core 10 as Di, 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 operation efficiency of the synchronous motor 1 .

In an embodiment of the present invention, preferably, as shown in FIG. 4 , the central angle corresponding to the pole crown of the rotor of the synchronous motor 1 is α1, and the pole pitch angle is α2, where α1/α2≥0.5.

In this embodiment, the central angle corresponding to each pole cap of the rotor of the synchronous motor 1 is set as α1, and the pole pitch angle is set as α2, wherein the pole cap is located on the outer circumference of the rotor core 20 and has a circular arc profile. Part, as shown in Figure 4, the part of the arc outline at A is the pole crown. In other words, the arcs on both sides of the d-axis of the magnetic pole form an entire arc with the center of rotation as the center, and the center of the entire arc corresponds to the circle. The angle is α1 and α1/α2 ≥ 0.5, which can provide sufficient main magnetic flux, improve the performance of the synchronous motor 1, and can meet the requirements of manufacturability.

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

In this embodiment, by setting the ratio of the inner diameter Di of the stator core 10 to its outer diameter Do to satisfy: 0.52≤Di/Do≤0.57, the optimal cost performance can be obtained while satisfying the moment of inertia, and the production cost of the synchronous motor 1 can be reduced .

In an embodiment of the present invention, preferably, the rated torque of the synchronous motor 1 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 1 is TPV, which satisfies: 5.18×10 ^-7 ≤T×Di ^-3 ×TPV ^-1 ≤1.17×10 ^-6 , 5kN·m·m ^-3 ≤TPV≤45kN·m·m ^-3 , where the unit of 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 .

In this embodiment, the rated torque of the synchronous motor 1 is T, the inner diameter of the stator core 10 is Di, and the torque per unit volume of the rotor is TPV, and satisfies 5.18×10 ⁻⁷ ≤T×Di ⁻³ ×TPV ^{− 1} ≤1.17×10 ^-6 , among which, the value range of the torque TPV per unit volume is 5kN·m·m ^-3 ≤TPV≤45kN·m·m ^-3 , which defines the rated torque T, The value range of the combined variable of the inner diameter Di of the stator core 10 and the torque per unit volume TPV of the rotor, so that the synchronous motor 1 can meet the power requirements of the compressor 2. In addition, for the synchronous motor 1 and the compressor using the rotor 2. It can effectively reduce the rotor flux leakage, increase the utilization rate of permanent magnets, and improve the efficiency of the synchronous motor 1.

In an embodiment of the present invention, preferably, as shown in FIG. 2 , the radial width W _T 1 at the root of the pole shoe at the end of the first tooth 142 is smaller than the diameter at the root of the pole shoe at the end of the second tooth 144 To width _WT 2.

In this embodiment, by setting the radial width _WT 1 at the root of the pole piece at the end of the first tooth 142 to be smaller than the radial width _WT 2 at the root of the pole piece at the end of the second tooth 144 , where the pole The shoe is located at one end of the protruding tooth 14 close to the center line of the stator core 10, and a radius line of the annular yoke 12 is drawn at the point where the pole shoe is connected to the protruding tooth 14. The length of the radius line extending on the pole shoe is the root of the pole shoe. It optimizes the magnetic flux path, can effectively increase the back EMF, reduce the copper loss of the winding, and realize a high-output synchronous motor 1. Specifically, contrary to the rotation direction of the rotor of the synchronous motor 1, among the two adjacent protruding teeth 14 forming a phase, the magnetic density of the protruding teeth 14 on the positive side of the rotor rotation direction is greater than that on the opposite side of the rotor rotation direction. Therefore, the magnetic densities of the adjacent two convex teeth 14 in the same phase are not uniform, which makes each convex tooth 14 in the adjacent group of convex teeth 14 There are differences in magnetic density, and the present invention reduces the radial width WT 1 at the root of the pole piece at the end of the first tooth 142 by making the radial width _WT 1 at the root of the pole piece at the end of the second tooth 144 smaller than the radial width _WT 2 at the end of the second tooth 144. The overall magnetic density saturation of the second tooth 144 is reduced, and the magnetic density of the convex teeth 14 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, and increases the The magnetic flux at the second tooth 144 can effectively increase the back EMF and improve the performance of the synchronous motor 1 .

In one embodiment of the present invention, preferably, the radial width _WT 1 at the root of the pole shoe at the end of the first tooth 142 and the radial width _WT 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.

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 defined to satisfy: 0.4≤ W _T 1/W _T 2 <1, which can ensure that the magnetic densities of the protruding teeth 14 are equivalent, and effectively avoid that the radial width at the root of the pole piece at the end of the first tooth 142 is too small, resulting in extremely uneven magnetic density distribution everywhere. , which affects the performance of synchronous motor 1.

As shown in FIG. 7 , another aspect of the present invention provides a compressor 2 , comprising: the synchronous motor 1 according to any one of the above embodiments.

Since the compressor 2 provided by the present invention has the synchronous motor 1 in any of the above-mentioned embodiments, it further has the beneficial effects of any of the above-mentioned embodiments, which will not be repeated here.

In an embodiment of the present invention, preferably, the compressor 2 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 located on the casing of the compressor 2, and The second terminal, the lead wire connected to the synchronous motor 1 and the exhaust pipe are arranged on the casing of the compressor 2. The synchronous motor 1 is sleeved on the crankshaft, and the first terminal and the second terminal are respectively provided with terminals.

In the present invention, the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed" and other terms 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 It is directly connected or indirectly connected through an intermediary. 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 situations. In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiment", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may 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 (10)

1. a synchronous motor, is characterized in that, comprises: a rotor core, which includes a rotor die and a slot with a magnet in the slot; and A stator core includes a ring-shaped yoke and a plurality of protruding teeth spaced along the center line of the ring-shaped yoke, the plurality of protruding teeth including a plurality of tooth groups, each of the tooth groups including The first teeth and the second teeth are sequentially arranged in the rotation direction of the rotor core, and the same-phase excitation coils are wound on the first teeth and the second teeth; Wherein, the maximum width Tw1 of the first teeth is smaller than the maximum width Tw2 of the second teeth, and satisfies 0.4≦Tw1/Tw2<1. 2. The synchronous motor according to claim 1, characterized in that, The slot-pole matching of the synchronous motor is 10 slots with 12 poles or 12 slots with 14 poles. 3. The synchronous motor according to claim 1, characterized in that, The winding direction of the excitation coil on the first tooth is opposite to the winding direction of the excitation coil on the second tooth. 4. The synchronous machine according to any one of claims 1 to 3, characterized in that, The magnets are permanent magnets, and the permanent magnets are distributed in a straight line or a V shape on any horizontal section of the rotor core, or the permanent magnets are tangentially magnetized magnets. 5. The synchronous motor according to claim 4, characterized in that, When the permanent magnets are distributed in a V-shape, the included angle of the V-shape ranges from 90° to 130°. 6. The synchronous machine according to any one of claims 1 to 3, characterized in that, 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, Among them, 0.75≤bm×2P/(π×Di)≤0.9. 7. The synchronous machine according to any one of claims 1 to 3, 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, where α1/α2≥0.5. 8. The synchronous machine according to any one of claims 1 to 3, characterized in that, The ratio of the inner diameter Di of the stator core to its outer diameter Do satisfies: 0.52≤Di/Do≤0.57. 9. The synchronous machine according to any one of claims 1 to 3, 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, which satisfies: 5.18× ^10-7≤T ×Di ^-3 ×TPV ^- 1≤1.17× ^10-6 , 5kN·m·m ^-3 ≤TPV≤45kN·m·m ^-3 , 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 . 10. A compressor, characterized by comprising the synchronous motor according to any one of claims 1 to 9.

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