WO2020253184A1

WO2020253184A1 - Stator, motor and compressor

Info

Publication number: WO2020253184A1
Application number: PCT/CN2019/127489
Authority: WO
Inventors: 魏会军; 高明世; 陈华杰; 马梓净; 刘通; 张凯; 孙文娇; 王晶
Original assignee: 珠海格力节能环保制冷技术研究中心有限公司
Priority date: 2019-06-17
Filing date: 2019-12-23
Publication date: 2020-12-24
Also published as: CN110086270A

Abstract

The present disclosure provides a stator, a motor and a compressor. The stator is provided with slots and teeth that are alternately arranged, the number of the slots is greater than or equal to 12, the number of poles of the stator is greater than or equal to 4, the number of slots per pole per phase of the stator is less than or equal to 0.5, the cross-sectional area of the slots is S1, and the cross-sectional area of the teeth is S2, wherein S1/S2 is less than or equal to 1. The present disclosure can effectively improve motor torque density and power density characteristics, so that motor performance is not reduced when the compressor works at a rated point, which improves piston compressor motor power density, and facilitates adaptation to the piston compressor low-speed trend.

Description

Stator, motor and compressor

Cross references to related applications

This disclosure is based on a Chinese application with an application number of 201910522856.8 and a filing date of June 17, 2019, and claims its priority. The disclosure of the Chinese application is hereby incorporated into this disclosure as a whole.

Technical field

The present disclosure relates to the technical field of driving devices, in particular to a stator, a motor and a compressor.

Background technique

The compressor is a driven fluid machine that promotes low-pressure gas to high-pressure gas, and is the heart of the refrigeration system. It sucks in low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. The frequency conversion piston compressors on the market have been developed for more than 20 years. The popularity of frequency conversion compressors has significantly improved the temperature control ability of refrigerators and freezers and the ability of food preservation. Makes people's quality of life greatly improved.

Variable-frequency piston compressors have grown from the earliest ones with large volume, low performance, high noise and high cost, to significantly better performance, small size, low cost and low noise. Development to today has put forward huge requirements for miniaturization, high-load startup, and highly adaptable design. At present, the frequency conversion motors commonly used in frequency conversion piston compressors include surface mount type 6S4P, 9S6P, built-in type 6S4P, 9S6P, external rotor 9S6P, etc. The typical characteristics of these motors are good craftsmanship, better performance, and the speed range of 1000-4000rpm. Suitable for piston compressor occasions.

However, the variable frequency piston compression motor known by the inventor has a low power density.

Summary of the invention

According to one aspect of the present disclosure, there is provided a stator having alternately arranged slots and teeth, the number of slots is 12 or more, the number of poles of the stator is 4 or more, and each pole of the stator The number of slots per phase is less than or equal to 0.5, the cross-sectional area of the slots is S1, and the cross-sectional area of the teeth is S2, where S1/S2 is less than or equal to 1.

Further, the width of the tooth portion is L1, and the number of the grooves is N, where (L1*N)/(1mm) is greater than or equal to 96.

Further, the stator is provided with a winding, and in the axial direction of the stator, the height L2 of the winding higher than the end of the stator is less than 10 mm.

Further, the stator is provided with an inner hole, the diameter of the inner hole is D1, and the length of the stator in the axial direction is H, wherein H/D1 is less than or equal to 0.39.

Further, the cross-sectional area of the stator is S3, where S1/S3 is less than or equal to 0.4.

According to another aspect of the present disclosure, there is provided a motor including a stator, the stator being the aforementioned stator.

Further, the motor further includes a rotor, the rotor is a ferrite rotor, and the number of pole pairs of the motor is 4-7.

Further, the motor further includes a rotor, the rotor is a neodymium iron boron rotor, and the number of pole pairs of the motor is 4-10.

According to another aspect of the present disclosure, there is provided a compressor including a motor, and the motor is the above-mentioned motor.

Further, the compressor is a piston compressor, the piston compressor includes a cylinder, the volume of the cylinder is greater than or equal to 7 cc, the number of slots is 12, and the number of poles of the motor is 10.

Further, the cylinder is provided with an intake port and an exhaust port, the cross-sectional area of the intake port is S4, and the cross-sectional area of the exhaust port is S5, where 40mm ² <S4 <66mm ² , 13mm ² <S5<28mm ² .

Further, the compressor further includes a crankshaft and a cylinder block, the cylinder is mounted on the cylinder block, the motor is drivingly connected with the crankshaft, the crankshaft is connected with the piston rod of the cylinder, and the stator The distance L3 between the end close to the cylinder block and the cylinder block is less than or equal to 15 mm.

Applying the technical solution of the present disclosure, the present disclosure adopts a multi-slot pole structure with the number of slots greater than or equal to 12 by making the number of pole pairs of the motor greater than or equal to 12, and the number of slots per pole per phase of the stator is reduced, while making S1/S2 Less than or equal to 1, can effectively improve the torque density and power density characteristics of the motor, so that the motor performance does not decrease when the compressor is working at the rated point, and the power density of the piston compressor motor is increased, which is convenient to adapt to the low-speed trend of the piston compressor.

Description of the drawings

The accompanying drawings of the specification constituting a part of the present disclosure are used to provide a further understanding of the present disclosure, and the exemplary embodiments and descriptions thereof are used to explain the present disclosure, and do not constitute an improper limitation of the present disclosure. In the attached picture:

Fig. 1 schematically shows a front view of the stator of the motor of the present disclosure;

Fig. 2 schematically shows a cross-sectional view of the stator of the motor of the present disclosure;

Figure 3 schematically shows a front view of the pump body of the compressor of the present disclosure;

FIG. 4 schematically shows a comparison diagram of the measured performance of the motor of the present disclosure and the comparison motor at 1200RPM;

FIG. 5 schematically shows a comparison graph of the measured performance of the motor of the present disclosure and the comparison motor at 1600 RPM.

Detailed ways

It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present disclosure will be described in detail with reference to the drawings and in conjunction with embodiments.

It should be noted that the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and/or "including" are used in this specification, they indicate There are features, steps, operations, devices, components, and/or combinations thereof.

For ease of description, spatially relative terms such as "above", "above", "above", "above", etc. can be used here to describe as shown in the figure. Shows the spatial positional relationship between a device or feature and other devices or features. It should be understood that the spatially relative terms are intended to encompass different orientations in use or operation other than the orientation of the device described in the figure. For example, if the device in the figure is inverted, then the device described as "above the other device or structure" or "above the other device or structure" will then be positioned as "below the other device or structure" or "on Under other devices or structures". Thus, the exemplary term "above" can include both orientations "above" and "below". The device can also be positioned in other different ways (rotated by 90 degrees or in other orientations, and the relative description of the space used here is explained accordingly.

1 to 3, according to an embodiment of the present disclosure, a compressor is provided. The compressor in the disclosure particularly refers to a piston compressor. Of course, under appropriate use conditions, the compressor in the present disclosure also It can be other types of compressors, such as rotary compressors or centrifugal compressors.

As recorded in the background art, the power density of the motor of the piston compressor known to the inventor is relatively low, which makes it difficult for the motor to adapt to the low-speed trend of the piston compressor, and it is difficult for the compressor system to give full play to the advantages of high energy efficiency in the low-speed range. .

For this reason, the compressor and the motor used to drive the pump body of the compressor are improved in the present disclosure, wherein the motor particularly refers to a tangential permanent magnet motor.

Specifically, the motor in the present disclosure includes a stator 10 and a rotor (not shown in the figure). Referring to Figures 1 and 2, the stator 10 in some embodiments has alternately arranged slots 11 and teeth 12, wherein the number of slots 11 is greater than or equal to 12, the number of poles of the stator 10 is greater than or equal to 4, and the number of poles of the stator 10 is greater than or equal to 4. The number of slots per phase per pole is less than or equal to 0.5, the cross-sectional area of the slot 11 is S1, and the cross-sectional area of the tooth 12 is S2, where S1/S2 is less than or equal to 1. It should be noted that the number of slots per pole per phase in some embodiments is the result of dividing the number of slots of the designated sub 10 by the number of phases, and then dividing by the number of poles. The cross section of the slot 11 and the cross section of the tooth 12 refer to the cross section obtained by cutting the stator 10 in the direction perpendicular to the axis of the stator 10. And the cross-sectional area S2 of the tooth 12 includes the area between the tooth pole shoe and the arc cut edge between the tooth root and the groove bottom (when there is no edge trim, it is the connection position between the tooth root and the groove bottom) The area.

By making the number of pole pairs of the stator 10 greater than or equal to 4, adopting a multi-slot pole structure with the number of slots 11 being greater than or equal to 12, and reducing the number of slots per pole per phase of the stator 10, while making S1/S2 less than or equal to 1, it can be effective Improve the motor torque density and power density characteristics, so that the performance of the motor does not decrease when the compressor is working at the rated point, and the power density of the piston compressor motor is increased to a new height, which is convenient to adapt to the low-speed trend of the piston compressor.

In the present disclosure, a multi-stage motor is used, and the compressor can operate easily and stably when the speed is lower than the industry's lowest speed of 800 rpm, and can be accurately driven when the speed is as low as 500 rpm.

In some embodiments, the width of the tooth portion 12 is L1, and the number of the grooves 11 is N, where L1*N/(1mm) is greater than or equal to 96, and the unit of L1 is mm. In the actual design process, if the teeth 12 of the stator 10 are not parallel teeth, L1 is taken as the average value of the tooth width. In the present disclosure, making L1*N/(1mm) greater than or equal to 96 can make the width of the tooth 12 of the motor stator 10 most suitable for the level of the piston compressor, can increase the power density of the motor, reduce the volume of the motor, and the low-speed performance and stability of the motor Excellent performance.

In some embodiments of the present disclosure, the rotor of the motor is a ferrite rotor. At this time, the number of pole pairs of the stator 10 of the motor is set to 4-7 as obtained by simulation test. For example, 4, 5, 6, or 7, can optimize the performance of the motor.

In other embodiments of the present disclosure, the rotor of the motor is a neodymium-iron-boron rotor, which is obtained through simulation tests. The number of pole pairs of the stator 10 is 4-10, such as 5, 6, 7, 8, 9 or 10. The performance of the motor is optimized.

In comparison, the anti-demagnetization ability of the NdFeB rotor is stronger than the anti-demagnetization ability of the ferrite rotor, and can be adapted to motors with more pole pairs.

Referring again to FIGS. 1 to 3, the motor in some embodiments further includes a motor insulation skeleton 20, the motor insulation skeleton 20 is arranged on the outside of the stator, the motor insulation skeleton 20 and the stator 10 are provided with windings 13, and the stator 10 In the axial direction, the height L2 of the winding 13 higher than the end of the stator 10 is less than 10 mm. The compressor also includes a cylinder 30, a cylinder base 50, and a crankshaft 40. The cylinder 30 is mounted on the cylinder base 50, the motor is drivingly connected to the crankshaft 40, and the crankshaft 40 is connected to the piston rod of the cylinder 30. After installation, the stator 10 is close to the cylinder. The distance L3 between one end of the seat 50 and the cylinder seat 50 is less than or equal to 15 mm. This design can effectively reduce the height of the compressor, thereby reducing the volume of the compressor. This reduction in height can also reduce the height of the compressor core, which is beneficial to improve compressor operating swing and reduce vibration.

In some embodiments, the stator 10 is provided with an inner hole 14, the rotor is installed in the inner hole 14, the diameter of the inner hole 14 is D1, and the length of the stator 10 in the axial direction is H, where H/D1 is less than or equal to 0.39 , Suitable for applications where compressor motors are miniaturized and power density increased.

In some embodiments, the cross-sectional area of the stator 10 is S3, which is a cross-section obtained by cutting along the axis direction perpendicular to the stator 10, where S1/S3 is less than or equal to 0.4, and S1/S2 is less than or equal to 1. , Can make the piston compressor work in the best working condition point to the maximum extent in the running process.

Referring to Figures 4 and 5, the performance of the motors in some embodiments and the comparison motors are tested and compared as shown in Figures 4 and 5. The abscissas in Figures 4 and 5 are the motor torque values. The unit is mNm, and the ordinate is the motor efficiency value. According to the comparison of Figures 4 and 5, it can be known that when the weight of the motor is reduced by 20% and the load point of the motor is 240mNm, the efficiency of the motor of the present disclosure is increased by 3-3.5%, and the effect is significant. stable.

In some embodiments, the volume of the compression cylinder 30 is greater than or equal to 7 cc. Correspondingly, the number of slots 11 of the motor stator 10 at this time is 12, and the number of poles of the motor is 10. The cylinder 30 is provided with an intake port (not shown in the figure) and an exhaust port (not shown in the figure). The cross-sectional area of the intake port is S4, and the cross-sectional area of the exhaust port is S5, of which, 40mm ² <S4<66mm ² , 13mm ² <S5<28mm ² , which makes the low-speed cooling capacity of the compressor more stable and has better performance. The cooling capacity range is larger than that of conventional compressors, which can better adapt to the cooling capacity requirements of refrigerators or freezers And performance noise requirements.

According to the foregoing embodiments, it can be known that the number of pole pairs of the motor of the compressor of the present disclosure is greater than or equal to 4, and combined with a better rotor design, the torque density can be improved. When suitable for ferrite rotors, the optimal number of pole pairs is 4-7. When applicable to NdFeB rotors, the optimal pole pair number range is 4-10.

The following table is the system energy efficiency evaluation results of the motor applied to the same compressor system:

From the data point of view, the compressor COP (coefficient of performance, which is the ratio of heating or cooling capacity to input power) at the application operating point is increased by 0.05-0.1, which can directly reduce costs and improve energy efficiency. .

From the above description, it can be seen that the above-mentioned embodiments of the present disclosure achieve the following technical effects: the compressor motor of the present disclosure selects the multi-slot pole structure, and is verified by experiments to select the optimal stator design scheme, which is effective Improve the torque density and power density characteristics of the motor, reduce the size of the motor, and reduce the cost. The low speed of the motor can reach 500rpm, and the operation stability is good.

It should be noted that the terms "first" and "second" in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present disclosure described herein, for example, can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

The foregoing descriptions are only preferred embodiments of the present disclosure, and are not intended to limit the present disclosure. For those skilled in the art, the present disclosure may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

A stator (10), wherein the stator (10) has alternately arranged slots (11) and teeth (12), the number of the slots (11) is greater than or equal to 12, and the stator (10) has The number of poles is greater than or equal to 4, the number of slots per pole per phase of the stator (10) is less than or equal to 0.5, the cross-sectional area of the slot (11) is S1, and the cross-sectional area of the tooth (12) is S2, Among them, S1/S2 is less than or equal to 1.
The stator (10) according to claim 1, wherein the width of the tooth portion (12) is L1, and the number of the slots (11) is N, wherein (L1*N)/(1mm) is greater than or equal to 96.
The stator (10) according to claim 1, wherein a winding (13) is provided on the stator (10), and in the axial direction of the stator (10), the winding (13) is higher than the The height L2 of the end of the stator (10) is less than 10mm.
The stator (10) according to claim 1, wherein the stator (10) is provided with an inner hole (14), the diameter of the inner hole (14) is D1, and the stator (10) is axially The length above is H, where H/D1 is less than or equal to 0.39.
The stator (10) according to any one of claims 1 to 4, wherein the cross-sectional area of the stator (10) is S3, wherein S1/S3 is less than or equal to 0.4.
A motor comprising a stator (10), wherein the stator (10) is the stator (10) according to any one of claims 1 to 5.
The motor according to claim 6, further comprising a rotor, the rotor is a ferrite rotor, and the number of pole pairs of the motor is 4-7.
The motor according to claim 6, further comprising a rotor, the rotor is a neodymium iron boron rotor, and the number of pole pairs of the motor is 4-10.
A compressor including a motor, wherein the motor is the motor according to any one of claims 6 to 8.
The compressor according to claim 9, wherein the compressor is a piston compressor, the piston compressor includes a cylinder (30), the cylinder (30) has a volume greater than or equal to 7cc, and the groove (11) The number of is 12, and the number of poles of the motor is 10.
The compressor according to claim 10, wherein the cylinder (30) is provided with a suction port and an exhaust port, the cross-sectional area of the suction port is S4, and the cross-sectional area of the exhaust port It is S5, where 40mm 2 <S 4 <66mm 2 and 13mm 2 <S5<28mm 2 .
The compressor according to claim 10, further comprising a crankshaft (40) and a cylinder block (50), the cylinder (30) is mounted on the cylinder block (50), the motor and the crankshaft (40) Drive connection, the crankshaft (40) is connected with the piston rod of the cylinder (30), the distance L3 between the end of the stator (10) close to the cylinder block (50) and the cylinder block (50) is less than or equal to 15mm.