CN111262361B

CN111262361B - Motor, compressor and refrigeration plant

Info

Publication number: CN111262361B
Application number: CN202010161550.7A
Authority: CN
Inventors: 徐飞; 邱小华; 江波
Original assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Current assignee: Anhui Meizhi Precision Manufacturing Co Ltd
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2021-05-04
Anticipated expiration: 2040-03-10
Also published as: CN111262361A

Abstract

The invention provides a motor, a compressor and refrigeration equipment. Wherein, the motor includes: a rotor; the rotor comprises a rotor core, a plurality of slots are formed in the rotor core and circumferentially distributed around the center line of the rotor core, and a magnetic part is arranged in each slot; the stator comprises a stator core and a stator winding, the stator core is provided with a plurality of stator convex teeth, the plurality of stator convex teeth are circumferentially distributed around the central line of the stator core, and the stator winding is wound on the plurality of stator convex teeth; wherein, the relation of the number Z of the stator convex teeth and the pole pair number P of the rotor satisfies: Z/P is 3; the effective value U of the counter potential between the lines of the stator winding, the rotating speed n of the motor and the outer diameter phi so of the stator meet the following requirements: and ke is equal to or more than U/n, and ke/phi so/Z multiplied by P is equal to or less than 0.352, wherein the unit of U is volt, the unit of n is kilo revolutions per minute, P is polar logarithm, and the unit of phi so is millimeter. The motor energy efficiency can be improved.

Description

Motor, compressor and refrigeration plant

Technical Field

The invention belongs to the technical field of refrigeration equipment, and particularly relates to a motor, a compressor and refrigeration equipment.

Background

In a rotary direct-current variable-frequency compressor adopting a motor in the related art, the motor generally adopts a built-in permanent magnet motor, and in recent years, with the increase of the threshold of the energy efficiency standard, higher requirements are provided for the energy efficiency of the motor, while the previous motor cannot meet the requirements of high energy efficiency more and more.

Disclosure of Invention

The present invention is directed to solving one of the technical problems of the prior art or the related art.

To this end, a first aspect of the invention proposes an electric machine.

A second aspect of the present invention proposes a compressor.

A third aspect of the invention provides a refrigeration apparatus.

In view of this, according to a first aspect of the present invention, there is provided a motor comprising: a rotor; the rotor comprises a rotor core, a plurality of slots are formed in the rotor core and circumferentially distributed around the center line of the rotor core, and a magnetic part is arranged in each slot; the stator comprises a stator core and a stator winding, the stator core is provided with a plurality of stator convex teeth, the plurality of stator convex teeth are circumferentially distributed around the central line of the stator core, and the stator winding is wound on the plurality of stator convex teeth; wherein, the relation of the number Z of the stator convex teeth and the pole pair number P of the rotor satisfies: Z/P is 3; the effective value U of the counter potential between the lines of the stator winding, the rotating speed n of the motor and the outer diameter phi so of the stator meet the following requirements: and ke is equal to or more than U/n, and ke/phi so/Z multiplied by P is equal to or less than 0.352, wherein the unit of U is volt, the unit of n is kilo revolutions per minute, P is polar logarithm, and the unit of phi so is millimeter.

The motor provided by the invention comprises a rotor and a stator, a plurality of slots are arranged on a rotor core of the rotor and are circumferentially distributed around the central line of the rotor core, a magnetic part, such as a magnet or magnetic steel, is arranged in each slot, a plurality of stator convex teeth are circumferentially distributed on the stator core around the central line of the stator core, the coils of the stator winding are wound on each stator lobe such that the ratio of the number Z of stator lobes to the number P of pole pairs of the rotor is 3, for example 12, the number P of pole pairs is 4, or the number Z of stator lobes is 9, the number P of pole pairs is 3, or the number Z of stator lobes is 6, the number of pole pairs P is 2, which is beneficial to the generation of uniform and regular air gap flux density between the electrified stator winding and the magnetic part, improves the efficiency of the motor, improves the energy efficiency of the motor, and thus reduces the energy consumption of refrigeration equipment applying the motor. Further, the effective value U of the back electromotive force between the stator windings, the rotation speed n of the motor, and the outer diameter Φ so of the stator satisfy: the default unit of ke is V/krpm, the default unit of ke is more than or equal to 0.213 ke/phi so/Z multiplied by P is less than or equal to 0.352, and if ke is divided by phi so, the divided value is divided by Z, and then multiplied by P, and the value is 0.25, 0.29 or 0.35, wherein the unit of U is volt, the unit of n is kilo-revolution/minute, P is a pole pair number, and the default unit of phi so is mm.

In addition, according to the motor in the above technical solution provided by the present invention, the following additional technical features may also be provided:

in one possible design, the number of stator lobes Z is 9, then 0.638 ≦ ke/Φ so ≦ 0.933.

In the design, under the condition that the number of the stator convex teeth is different, the demagnetization capacities of the motor are different, so that the number of different stator teeth can correspond to different value ranges of ke/phi so, and according to the demagnetization characteristics of the motor, the more the number of teeth is, the stronger the demagnetization capacity of the motor is, and the larger the value range of ke/phi so is. Therefore, under the condition that the number Z of the stator convex teeth is 9, the ratio of ke to the outer diameter phi so of the stator is 0.638-0.933, and if ke/phi so is equal to 0.7, 0.8 or 0.9, the loss of a motor system can be obviously reduced on the premise that the demagnetization capability of the motor is not reduced, so that the energy efficiency of the motor is improved.

In one possible design, the number Z of stator lobes is 12, then 0.679 ≦ ke/Φ so ≦ 1.056.

In the design, under the condition that the number of the stator convex teeth is different, the demagnetization capacities of the motor are different, so that the number of different stator teeth can correspond to different value ranges of ke/phi so, and according to the demagnetization characteristics of the motor, the more the number of teeth is, the stronger the demagnetization capacity of the motor is, and the larger the value range of ke/phi so is. Therefore, under the condition that the number Z of the stator convex teeth is 12, the ratio of ke to the outer diameter phi so of the stator is 0.679-1.056, and if ke/phi so is equal to 0.7 or 0.8 or 1, the loss of a motor system can be obviously reduced on the premise that the demagnetization capability of the motor is not reduced, and the energy efficiency of the motor is further improved.

In one possible design, the back electromotive force U of the stator winding, the rotational speed n of the motor, the outer diameter Φ so of the stator, and the number Z of stator teeth satisfy: and ke/(n/1000), wherein the range of ke/phi so is positively correlated with Z. The motor demagnetization control method is beneficial to obviously reducing the loss of a motor system on the premise that the demagnetization capability of the motor is not reduced, and further improving the energy efficiency of the motor.

In one possible design, the number of stator lobes Z is 9, and the relationship between the number of pole pairs P of the rotor and ke satisfies: 0.643 is less than or equal to 2P multiplied by Z/ke is less than or equal to 0.777.

In the design, different numbers of stator teeth correspond to different ratio ranges of ke/Φ so, which is determined according to the demagnetization characteristics of the motor, the more the number of teeth is, the more the number of poles is, the stronger the demagnetization capability of the motor is, and the larger the range value of P multiplied by Z/ke is. In the case where the number Z of stator teeth is 9, a higher ke value can be ensured under the condition that the motor has strong demagnetization energy by making the pole pair numbers P and ke of the rotor satisfy 0.643 ≦ 2P × Z/ke ≦ 0.777, for example, 2P × Z/ke equal to 0.65 or 0.7 or 0.76. Therefore, the loss of a motor system can be obviously reduced on the premise that the demagnetization capability of the motor is not reduced, and the energy efficiency of the motor is further improved.

In one possible design, the number Z of stator lobes is 12, and the relationship between the number P of pole pairs of the rotor and ke satisfies: 1.011 is less than or equal to 2P multiplied by Z/ke is less than or equal to 1.28.

In the design, different numbers of stator teeth correspond to different ratio ranges of ke/Φ so, which is determined according to the demagnetization characteristics of the motor, the more the number of teeth is, the more the number of poles is, the stronger the demagnetization capability of the motor is, and the larger the range value of P multiplied by Z/ke is. Under the condition that the number Z of the stator convex teeth is 12, the number of pole pairs P and ke of the rotor is enabled to meet the condition that 1.011 is not less than 2 PxZ/ke is not more than 1.28, for example, 2 PxZ/ke is equal to 1.03 or 1.15 or 1.26, a higher ke value can be ensured under the condition that the motor has strong demagnetization capacity, so that the loss of a motor system can be obviously reduced on the premise that the demagnetization capacity of the motor is not reduced, and the energy efficiency of the motor is further improved.

In one possible design, the relationship between the number of stator lobes Z, the number of pole pairs P of the rotor, and ke satisfies: 0.3 is less than or equal to 2P multiplied by Z/ke is less than or equal to 2.1.

In one possible design, the relationship between the thicknesses hm and ke of the magnetic member satisfies: 0.018-0.027/ke, wherein hm is millimeter.

In this design, by making the ratio of the thickness hm to ke of the magnetic member between 0.018 and 0.027, such as hm/ke equal to 0.020 or 0.024 or 0.025, a thinner magnetic member can still meet demagnetization requirements with a high ke value. The thinner the magnetic part is, the higher the ke is, the smaller the ratio is, and the smaller the ratio of the magnetic part to the magnetic part is, the stronger the demagnetization capability of the motor is, so that the loss of a motor system is obviously reduced on the premise that the demagnetization capability of the motor is not reduced, and the energy efficiency of the motor is further improved. In addition, the magnetic part is very thin, so that the cost of the motor is reduced, and the cost performance of the motor is improved. Wherein hm is in mm.

In one possible design, the relationship between the outer diameter Φ ro of the rotor and ke satisfies: phi ro/ke is more than or equal to 0.65 and less than or equal to 0.84, and the unit of phi ro is millimeter.

In the design, the ratio of the outer diameter phi ro to the outer diameter ke of the rotor is 0.65 to 0.84, for example, phi ro/ke is equal to 0.7 or 0.75 or 0.81, so that the motor has the optimal demagnetization capability, and further higher system energy efficiency is obtained. Wherein the unit of Φ ro is mm.

In one possible design, the stator winding includes a plurality of coils, each coil being wound around one of the stator lobes. Further, the relationship between the number of turns N of each coil and ke satisfies: n/ke is more than or equal to 0.893 and less than or equal to 1.367.

In the design, the ratio of the number of turns N to the number of ke of each coil is made to be between 0.893 and 1.367, for example, N/ke is equal to 0.9 or 1 or 1.2, so that the motor has the optimal demagnetization capability, and further, on the basis, higher system energy efficiency is obtained.

In one possible design, the relationship between the inner diameter of the stator Φ si and the outer diameter of the stator Φ so satisfies: phi si/phi so is not less than 0.58 and not more than 0.55, and the unit of phi si is millimeter.

In the design, the ratio of the inner diameter phi si of the stator to the outer diameter phi so of the stator is 0.55-0.58, for example, phi si/phi so is 0.56 or 0.57 or 0.58, so that the rotational inertia can be increased, the stable exertion of the low-frequency energy efficiency of the compressor using the motor is facilitated, and the cost performance of the motor can be improved. Wherein the unit of Φ si is mm.

In one possible design, ke satisfies: ke is not less than 68V/krpm and not more than 95V/krpm; and/or the outer diameter Φ so of the stator satisfies: phi so is more than or equal to 90mm and less than or equal to 109 mm; and/or the magnetic part is a rare earth permanent magnetic part.

In the design, the ke is higher by enabling the value of the ke to be between 68V/krpm and 95V/krpm, such as the ke is 70V/krpm or 85V/krpm or 90V/krpm, and the energy efficiency of a motor system is improved. In addition, the outer diameter phi so of the stator is between 90mm and 109mm, for example, phi so is 95mm or 100mm or 105mm, the outer diameter of the motor is limited, the motor is not too large, and the motor in the size range has high energy efficiency. In addition, the magnetic part is the rare earth permanent magnetic part, so that the motor has stronger demagnetization capability and the motor energy efficiency is improved.

A second aspect of the present invention provides a compressor comprising: the motor according to any one of the above aspects.

The compressor provided by the invention has the advantages of any technical scheme due to the motor of any technical scheme, and therefore, the compressor is not described herein again.

Furthermore, the compressor also comprises a shell, a crankshaft, a cylinder, a piston and other components, and the motor is arranged in the shell and connected with the crankshaft so as to drive the crankshaft to rotate. The crankshaft extends into the cylinder and is connected with the piston to perform compression movement.

A third aspect of the present invention provides a refrigeration apparatus comprising: a compressor according to any one of the preceding claims.

The refrigeration equipment provided by the invention has the advantages of any technical scheme due to the compressor of any technical scheme, and therefore, the details are not repeated herein. The high-energy-efficiency refrigeration equipment such as an air conditioner, a refrigerator and the like is realized, the market competitiveness is improved, and the energy-saving requirement is met.

Furthermore, the refrigeration equipment also comprises a condenser, an evaporator, a throttling element and the like. The outlet of the compressor is communicated with the inlet of the condenser, the inlet of the compressor is communicated with the outlet of the evaporator, and the throttling element is arranged between the condenser and the evaporator.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

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

fig. 1 shows a schematic structural view of a motor of an embodiment of the present invention;

FIG. 2 shows a schematic structural view of a rotor of one embodiment of the present invention;

fig. 3 shows a schematic structural view of a rotor of another embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

100 motor, 110 rotor, 111 rotor core, 112 slot, 113 magnetic element, 121 stator core and 122 stator convex tooth.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

An electric machine 100 according to some embodiments of the present invention is described below with reference to fig. 1-3.

The first embodiment is as follows:

as shown in fig. 1 to 3, an electric machine 100 includes: a rotor 110; the rotor 110 includes a rotor core 111, the rotor core 111 is provided with a plurality of slots 112, the plurality of slots 112 are circumferentially distributed around a center line of the rotor core 111, and each slot 112 is provided with a magnetic member 113 therein; the stator comprises a stator core 121 and a stator winding, the stator core 121 is provided with a plurality of stator convex teeth 122, the plurality of stator convex teeth 122 are circumferentially distributed around the central line of the stator core 121, and the stator winding is wound on the plurality of stator convex teeth 122; wherein, the relationship between the number Z of the stator teeth 122 and the pole pair number P of the rotor 110 satisfies: Z/P is 3. The effective value U of the counter potential among the stator windings, the rotating speed n of the motor 100 and the outer diameter phi so of the stator meet the following requirements: and ke is equal to or more than U/n, and ke/phi so/Z multiplied by P is equal to or less than 0.352, wherein the unit of U is volt, the unit of n is kilo revolutions per minute, P is polar logarithm, and the unit of phi so is millimeter.

The motor 100 of the present invention includes a rotor 110 and a stator, wherein a plurality of slots 112 are formed in a rotor core 111 of the rotor 110, the plurality of slots 112 are circumferentially distributed around a center line of the rotor core 111, a magnetic member 113, such as a magnet or magnetic steel, is disposed in each slot 112, and a plurality of stator teeth 122 are circumferentially distributed on a stator core 121 around a center line thereof, a coil of a stator winding is wound on each stator tooth 122, and a ratio of the number Z of the stator teeth 122 to a pole pair number P of the rotor 110 is 3, for example, the number Z of the stator teeth 122 is 12, the number P of pole pairs is 4, or the number Z of the stator teeth 122 is 9 as shown in fig. 1, as the number of magnetic poles of the rotor 110 is 6, the P of pole pairs is 3, or the number Z of the stator teeth 122 is 6, the P of pole pairs is 2, which is beneficial for the energized stator winding and the magnetic member 113 to generate a uniform and regular air gap magnetic density, the efficiency of the motor 100 is improved, and the energy efficiency of the motor 100 is improved, so that the energy consumption of the refrigeration equipment using the motor 100 is reduced.

Further, the effective value U of the counter electromotive force between the stator windings, the rotation speed n of the motor 100, and the outer diameter Φ so of the stator satisfy: the unit of ke is equal to U/n, the unit of default ke is V/krpm, the unit of ke/Φ so/zxp is equal to or less than 0.213, and is equal to or less than 0.352, for example, the value of ke/Φ so/zxp is 0.25, 0.29 or 0.35, the unit of U is volt, the unit of n is kilo-revolution/minute, P is the pole pair number, and the unit of default Φ so is mm, on the premise that the demagnetization capability of the motor 100 is not reduced, the system loss of the motor 100 can be significantly reduced, the energy efficiency of the motor 100 can be further improved, and the low-frequency energy efficiency of a compressor using the motor 100 can be improved.

Further, the value range of ke/Φ so is positively correlated with Z. The system loss of the motor 100 can be obviously reduced on the premise that the demagnetization capability of the motor 100 is not reduced, and the energy efficiency of the motor 100 can be further improved.

Further, the relationship between the number Z of the stator teeth 122 and the pole pair number P of the rotor 110 and ke satisfies: 0.3 is less than or equal to 2P multiplied by Z/ke is less than or equal to 2.1.

Further, ke satisfies: ke is not less than 68V/krpm and not more than 95V/krpm; and/or the outer diameter Φ so of the stator satisfies: phi so is more than or equal to 90mm and less than or equal to 109 mm; and/or the magnetic member 113 is a rare earth permanent magnetic member. The ke is higher by enabling the value of the ke to be between 68V/krpm and 95V/krpm, such as the value of the ke is 70V/krpm or 85V/krpm or 90V/krpm, and the energy efficiency of the motor 100 system is improved. In addition, by setting the outer diameter Φ so of the stator to be between 90mm and 109mm, for example, Φ so is 95mm or 100mm or 105mm, the outer diameter of the motor 100 is limited, the motor 100 is not too large, and the motor 100 in the size range has high energy efficiency. In addition, the magnetic member 113 is a rare-earth permanent magnetic member, which is beneficial to the motor 100 to have stronger demagnetization capability and improve the energy efficiency of the motor 100.

Example two:

on the basis of the first embodiment, the number Z of the stator teeth 122 is further limited to 9, and 0.638 ≦ ke/Φ so ≦ 0.933.

In this embodiment, under the condition that the number of the stator teeth 122 is different, the demagnetization capability of the motor 100 is different, and further, the number of different stator teeth can correspond to different value ranges of ke/Φ so, and according to the demagnetization characteristic of the motor 100, the more the number of teeth is, the stronger the demagnetization capability of the motor 100 is, and the larger the value range of ke/Φ so can be. Therefore, when the number Z of the stator teeth 122 is 9, by making the ratio of ke to the outer diameter Φ so of the stator between 0.638 and 0.933, for example, ke/Φ so is equal to 0.7, 0.8, or 0.9, the system loss of the motor 100 can be significantly reduced without reducing the demagnetization capability of the motor 100, and the energy efficiency of the motor 100 can be further improved.

Further, the relationship between the pole pair number P and ke of the rotor 110 satisfies: 0.643 is less than or equal to 2P multiplied by Z/ke is less than or equal to 0.777.

Different stator tooth numbers correspond to different ratio ranges of ke/Φ so, and the number of teeth is more, the number of poles is more, the demagnetization capability of the motor 100 is stronger, and the range value of P × Z/ke is larger, which is determined according to the demagnetization characteristic of the motor 100. When the number Z of the stator teeth 122 is 9, the number of pole pairs P and ke of the rotor 110 satisfies 0.643 ≤ 2 pxz/ke ≤ 0.777, for example, 2 pxz/ke is equal to 0.65 or 0.7 or 0.76, so that a higher ke value can be ensured under the condition that the motor 100 has a strong demagnetization capability, as can be seen from table 1 below, thereby significantly reducing the system loss of the motor 100 without reducing the demagnetization capability of the motor 100, and further improving the energy efficiency of the motor 100.

Table 1:

example three:

on the basis of the first embodiment, the number Z of the stator teeth 122 is further limited to 12, and 0.679 ≦ ke/Φ so ≦ 1.056.

In this embodiment, under the condition that the number of the stator teeth 122 is different, the demagnetization capability of the motor 100 is different, and further, the number of different stator teeth can correspond to different value ranges of ke/Φ so, and according to the demagnetization characteristic of the motor 100, the more the number of teeth is, the stronger the demagnetization capability of the motor 100 is, and the larger the value range of ke/Φ so can be. Therefore, when the number Z of the stator teeth 122 is 12, by making the ratio of ke to the outer diameter Φ so of the stator between 0.679 and 1.056, for example, ke/Φ so is equal to 0.7 or 0.8 or 1, the system loss of the motor 100 can be significantly reduced without reducing the demagnetization capability of the motor 100, and the energy efficiency of the motor 100 can be further improved.

Further, the relationship between the pole pair number P and ke of the rotor 110 satisfies: 1.011 is less than or equal to 2P multiplied by Z/ke is less than or equal to 1.28.

Different stator tooth numbers correspond to different ratio ranges of ke/Φ so, and the number of teeth is more, the number of poles is more, the demagnetization capability of the motor 100 is stronger, and the range value of P × Z/ke is larger, which is determined according to the demagnetization characteristic of the motor 100. Under the condition that the number Z of the stator teeth 122 is 12, the number of pole pairs P and ke of the rotor 110 satisfies 1.011 or more and 2 pxz/ke or less and 1.28, for example, 2 pxz/ke is equal to 1.03 or 1.15 or 1.26, so that a higher ke value can be ensured under the condition that the motor 100 has strong demagnetization capacity, and therefore, the system loss of the motor 100 can be remarkably reduced on the premise that the demagnetization capacity of the motor 100 is not reduced, and the energy efficiency of the motor 100 is further improved.

Example four:

on the basis of any of the above embodiments, the relationship between the thickness hm and the thickness ke of the magnetic member 113 is further defined to satisfy: 0.018-0.027/ke, wherein hm is millimeter.

In this embodiment, by making the ratio of the thickness hm to ke of the magnetic member 113 between 0.018 and 0.027, such as hm/ke equal to 0.020 or 0.024 or 0.025, the demagnetization requirement can be satisfied even with a thin magnetic member 113 with a high ke value. The thinner the magnetic part 113 is, the higher ke is, the smaller the ratio is, and the smaller the ratio of the two is, the stronger the demagnetization capability of the motor 100 is, thereby being beneficial to obviously reducing the system loss of the motor 100 on the premise that the demagnetization capability of the motor 100 is not reduced, and further improving the energy efficiency of the motor 100. In addition, the magnetic member 113 is very thin, which is beneficial to reducing the cost of the motor 100 and improving the cost performance of the motor 100. Wherein hm is in mm.

On the basis of any of the above embodiments, the relationship between the outer diameter Φ ro of the rotor 110 and ke is further defined to satisfy: phi ro/ke is more than or equal to 0.65 and less than or equal to 0.84. By making the ratio of the outer diameter Φ ro to ke of the rotor 110 between 0.65 and 0.84, such as Φ ro/ke equal to 0.7 or 0.75 or 0.81, the motor 100 can have an optimal demagnetization capability, thereby achieving higher system energy efficiency. Wherein the unit of Φ ro is mm.

In addition to any of the above embodiments, the stator winding further includes a plurality of coils, each coil being wound around one of the stator teeth 122. Further, the relationship between the number of turns N of each coil and ke satisfies: n/ke is more than or equal to 0.893 and less than or equal to 1.367. By making the ratio of the number of turns N to ke of each coil before 0.893 to 1.367, for example, N/ke is equal to 0.9 or 1 or 1.2, the motor 100 can have an optimal demagnetization capability, and therefore, on the basis, a higher system energy efficiency can be obtained. Wherein, because of the few turns, the per se ke value is not dominant, but because of the design of large splitting ratio, a higher ke value can still be obtained.

On the basis of any one of the above embodiments, the relationship between the inner diameter Φ si of the stator and the outer diameter Φ so of the stator is further defined to satisfy: phi si/phi so is not less than 0.58 and not more than 0.55. The ratio of the inner diameter phi si of the stator to the outer diameter phi so of the stator is 0.55 to 0.58, for example, phi si/phi so is 0.56 or 0.57 or 0.58, so that the rotational inertia can be increased, the stable performance of the low-frequency energy efficiency of the compressor using the motor 100 is facilitated, and the cost performance of the motor 100 can be improved. Wherein the unit of Φ si is mm.

Example five:

a compressor, comprising: the electric machine 100 of any of the above embodiments. The compressor provided by the present invention has the advantages of the motor 100 according to any of the above embodiments, and therefore, the advantages of any of the above embodiments are not repeated herein.

Further, the compressor further includes a housing, a crankshaft, a cylinder, a piston, and other components, and the motor 100 is disposed in the housing and connected to the crankshaft to drive the crankshaft to rotate. The crankshaft extends into the cylinder and is connected with the piston to perform compression movement.

Example six:

a refrigeration appliance comprising: a compressor as in any one of the preceding embodiments. The refrigeration equipment provided by the invention has the advantages of any of the above embodiments due to the compressor of any of the above embodiments, which are not repeated herein. The high-energy-efficiency refrigeration equipment such as an air conditioner, a refrigerator and the like is realized, the market competitiveness is improved, and the energy-saving requirement is met.

In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric machine, comprising:

the rotor comprises a rotor core, a plurality of slots are formed in the rotor core and circumferentially distributed around the center line of the rotor core, and a magnetic part is arranged in each slot;

the stator comprises a stator core and a stator winding, the stator core is provided with a plurality of stator convex teeth, the plurality of stator convex teeth are circumferentially distributed around the central line of the stator core, and the stator winding is wound on the plurality of stator convex teeth;

wherein, the relation between the number Z of the stator convex teeth and the pole pair number P of the rotor satisfies: Z/P is 3; the effective value U of the counter potential among the lines of the stator winding, the rotating speed n of the motor and the outer diameter phi so of the stator meet the following requirements: and ke is equal to or more than U/n, and ke/phi so/Z multiplied by P is equal to or less than 0.352, wherein the unit of U is volt, the unit of n is kilo revolutions per minute, P is polar logarithm, and the unit of phi so is millimeter.

2. The electric machine of claim 1,

the number Z of the stator convex teeth is 9, and then ke/phi so as to be more than or equal to 0.638 and less than or equal to 0.933.

3. The electric machine of claim 1,

the number Z of the stator convex teeth is 12, and then ke/phi so is more than or equal to 0.679 and less than or equal to 1.056.

4. The machine according to claim 1 or 2,

the number Z of the stator convex teeth is 9, and the relation between the pole pair number P of the rotor and the ke satisfies the following conditions: 0.643 is less than or equal to 2P multiplied by Z/ke is less than or equal to 0.777.

5. The machine according to claim 1 or 3,

the number Z of the stator convex teeth is 12, and the relation between the pole pair number P of the rotor and the ke satisfies the following conditions: 1.011 is less than or equal to 2P multiplied by Z/ke is less than or equal to 1.28.

6. The machine according to any of claims 1 to 3,

the relation between the thickness hm of the magnetic piece and the ke satisfies the following conditions: 0.018-0.027/ke, wherein hm is millimeter.

7. The machine according to any of claims 1 to 3,

the relation between the outer diameter phi ro of the rotor and the ke satisfies the following conditions: phi ro/ke is more than or equal to 0.65 and less than or equal to 0.84, and the unit of phi ro is millimeter.

8. The machine according to any of claims 1 to 3,

the stator winding comprises a plurality of coils, and each coil is wound on one stator convex tooth;

the relation between the number of turns N of each coil and the ke satisfies the following conditions: n/ke is more than or equal to 0.893 and less than or equal to 1.367.

9. The machine according to any of claims 1 to 3,

the relation between the inner diameter phi si of the stator and the outer diameter phi so of the stator satisfies the following conditions: phi si/phi so is not less than 0.58 and not more than 0.55, and the unit of phi si is millimeter.

10. The machine according to any of claims 1 to 3,

the ke satisfies: ke is not less than 68V/krpm and not more than 95V/krpm; and/or

The outer diameter phi so of the stator satisfies: phi so is more than or equal to 90mm and less than or equal to 109 mm; and/or

The magnetic part is a rare earth permanent magnetic part.

11. The machine according to any of claims 1 to 3,

the relation between the number Z of the stator convex teeth and the pole pair number P of the rotor satisfies that: Z/P is 3.

12. A compressor, comprising:

an electric machine as claimed in any one of claims 1 to 11.

13. A refrigeration apparatus, comprising:

the compressor of claim 12.