CN220586044U

CN220586044U - Motor, compressor and temperature regulating equipment

Info

Publication number: CN220586044U
Application number: CN202222794927.XU
Authority: CN
Inventors: 姚俊; 郭谨博; 盖蕊; 邱小华
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2024-03-12
Anticipated expiration: 2032-10-21
Also published as: CN220822725U

Abstract

The utility model discloses a motor, a compressor and a temperature regulating device, wherein the motor comprises a rotor and a stator surrounding the rotor; the rotor comprises an iron core and a permanent magnet arranged on the iron core; the width of the air gap of the motor is delta; the number of poles of the magnetic poles in the rotor is 2P; the permanent magnet contains cerium; the thickness of the permanent magnet is h; the sum of the widths of the permanent magnets in each magnetic pole is w; and: 1+delta is more than or equal to h and less than or equal to 1.4+delta (1); 3 is less than or equal to 23 x h-25 (2); 22.5.ltoreq.2Ph.ltoreq.77 (3); wherein, the units of w, h and delta are all mm. The motor provided by the utility model can be restrained by the structure, and when the permanent magnets are identical, the performance of the obtained motor in terms of demagnetization resistance and the like is improved to the greatest extent. The utility model also provides a compressor comprising the motor and temperature regulating equipment comprising the compressor.

Description

Motor, compressor and temperature regulating equipment

Technical Field

The utility model relates to the technical field of motors, in particular to a motor, a compressor and temperature regulating equipment.

Background

The current air conditioner compressor basically adopts a variable frequency motor, the variable frequency motor generally adopts a permanent magnet motor, and the excitation mode of a rotor of the permanent magnet motor is magnet excitation. Most of permanent magnets for motors are rare earth magnets, common rare earth elements comprise praseodymium, neodymium and other heavy rare earth elements, and the price of the rare earth elements is gradually increased due to the fact that the reserves of the rare earth elements are small, and further the price of rare earth magnet materials and the cost of the motors are increased linearly.

In order to solve the cost problem and the rare earth resource waste problem, one solution in the prior art is to replace praseodymium, neodymium and other elements in the rare earth magnet with cerium elements with cheaper prices and richer reserves. Although the method can relieve cost pressure, the remanence and the coercive force of the magnet can be obviously influenced, wherein the coercive force is directly expressed as anti-demagnetizing capability, when the magnets are the same in size and the same motor is mounted, the magnets with low coercive force have poor anti-demagnetizing capability of the rotor, and the rotor has more obvious demagnetizing and higher demagnetizing risk. Further, the motor and related products can be disabled, the service life of the products is directly influenced, and the use experience of users is destroyed.

In addition, as the power density of the permanent magnet motor increases, the anti-demagnetizing capability of the rotor magnet decreases. When the magnet is demagnetized irreversibly, the running performance and reliability of the motor and the compressor are affected, so that the service life of the product is seriously affected.

In conclusion, through structural constraint, it is particularly important to improve the anti-demagnetization performance of the motor.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the motor, and the overall performance of the motor can be improved.

The utility model also provides a compressor comprising the motor.

The utility model also provides temperature regulating equipment comprising the compressor.

According to an embodiment of the first aspect of the present utility model, an electric machine is presented, the electric machine comprising a rotor and a stator surrounding the rotor;

the rotor comprises an iron core and a permanent magnet arranged on the iron core;

the width of the air gap of the motor is delta; the number of poles of the magnetic poles in the rotor is 2P;

the permanent magnet contains cerium; the thickness of the permanent magnet is h;

and:

1+δ≤h≤1.4+δ (1)；

3≤23*h-25 (2)；

22.5≤2P*h*w/5≤77 (3)；

wherein, the units of w, h and delta are all mm.

The control method according to the embodiment of the utility model has at least the following beneficial effects:

in a motor adopting rare earth magnets, if other conditions are kept unchanged, the width of an air gap of the motor, the number of poles and the anti-demagnetizing capability of the motor are positively correlated; when the residual magnetism and the intrinsic coercive force are the same, the greater the thickness and the length of the permanent magnet are, the efficiency and the demagnetization resistance of the whole motor can be improved. Meanwhile, the wider the air gap width is, the operation stability of the motor is relevant; the width of the air gap, the thickness and length of the permanent magnets are related to the final dimensions of the motor; the number of rotor poles affects both the final size of the motor and its structural complexity.

Through a great deal of experimental study and analysis, if the thickness and the air gap width of the permanent magnet are limited in the relation shown in the formula (1), the stable operation of the motor can be maintained, and even if a certain amount of cerium is doped in the permanent magnet, the anti-demagnetization performance of the motor is not obviously affected.

Through a large number of experimental researches and analyses, the utility model can ensure the motor performance as much as possible on the basis of the same permanent magnet when the parameters of h, w and the like meet the relations of formulas (1) - (3) through counting the data of thickness, width, rotor pole number, air gap width and the like. That is, the utility model obtains the motor with the performance as good as possible by restraining the relative relation among the parameters such as the thickness, the width, the number of poles of the rotor, the width of the air gap and the like of the permanent magnet, and the performance such as the size meets the use requirement, the energy efficiency, the reliability and the like meet the use requirement. The product associated with the motor can reliably run for a long time, and the service life of the product is prolonged.

According to some embodiments of the utility model, the number of poles 2P, the thickness h of the permanent magnet and the width w of the permanent magnet satisfy the following formula:

40≤2P*h*w/5≤77 (3)。

22.5≤2P*h*w/5≤49 (3)。

30≤2P*h*w/5≤61 (3)。

27.5≤2P*h*w/5≤57 (3)。

according to some embodiments of the utility model, the thickness h of the permanent magnet satisfies the following formula:

5≤23*h-25 (2)；

preferably:

6≤23*h-25 (2)；

preferably:

10≤23*h-25 (2)。

according to some embodiments of the utility model, the cerium in the permanent magnet is uniformly distributed.

According to some embodiments of the utility model, the cerium in the permanent magnet is distributed in a gradient.

The cerium content and the anti-demagnetization performance of the motor are in a reverse relation, so that the cerium content is limited in the range, and the efficiency and the anti-demagnetization performance of the motor can be ensured on the basis of reducing the cost.

According to some embodiments of the utility model, the stator is provided with a stator slot.

According to some embodiments of the utility model, the number of stator slots on the stator is equal to or greater than 12.

The number of the stator slots is related to the overall design of the motor, and although the fact that 12 stator slots correspond to 8 magnetic poles of the rotor is a preferable technology at the present stage, the number of the stator slots can be adjusted according to the actual design of the motor.

According to some embodiments of the utility model, the air gap width delta of the motor is in the range of 0.3-0.8 mm; i.e. the minimum gap between the stator and the rotor is 0.3-0.8 mm.

According to some preferred embodiments of the utility model, the air gap width delta of the motor ranges from 0.4 mm to 0.6mm.

According to some preferred embodiments of the utility model, the motor has an air gap width δ=0.5 mm.

According to some embodiments of the utility model, the rotor has a pole number of 2P.gtoreq.6.

According to some embodiments of the utility model, the rotor has a pole number of 2P.gtoreq.8.

According to some embodiments of the utility model, the rotor has a pole count of 2P.ltoreq.12.

Preferably, the rotor has a pole count of 6, 8, 10 or 12.

When the number of poles of the rotor is within the above range, even if cerium is doped in the permanent magnet, the efficiency, demagnetization resistance, life and the like of the motor are not affected.

According to some embodiments of the utility model, the thickness h of the permanent magnet ranges from 1.3 mm to 2.2mm.

According to some preferred embodiments of the utility model, the thickness h of the permanent magnet ranges from 1.5 to 1.8mm.

According to some preferred embodiments of the utility model, the thickness h of the permanent magnet has a value in the range of about 1.6mm, or 1.7mm.

According to some embodiments of the utility model, the sum of the widths of the permanent magnets in each pole is 15-22 mm.

According to some preferred embodiments of the utility model, the sum of the widths of the permanent magnets in each pole is 16-19 mm.

According to some embodiments of the utility model, the width of the permanent magnet in each pole is about 16.4mm, or 18.8mm.

Therefore, the sum of the thickness and the width is matched with the cerium content in the permanent magnet, so that the anti-demagnetization performance of the size of the motor can be effectively adjusted, and the service life and the efficiency of the motor are ensured.

According to some embodiments of the utility model, in the motor, the permanent magnet has a remanence of 1.25 to 1.35T;

preferably, the permanent magnet has a remanence of about 1.33T.

According to some embodiments of the utility model, the intrinsic coercivity of the permanent magnet is greater than or equal to 1700KA/m.

According to some preferred embodiments of the utility model, the permanent magnet has an intrinsic coercivity between 1710 and 1750 KA/m.

According to some embodiments of the utility model, the permanent magnets are arranged in a "straight" pattern on the core.

When the permanent magnets are arranged in a straight shape, each permanent magnet is a magnetic pole; thus, the width of each permanent magnet is w.

According to some embodiments of the utility model, the permanent magnets are arranged in a V-shape on the core.

Each V-shaped opening can face to the axis of the rotor core or face to the outer side of the rotor core, and the technical scheme is not limited rigidly.

By forming the two permanent magnets in the same group into a V-shaped distribution, on the one hand, a hybrid magnetic circuit structure can be formed in the rotor. The hybrid magnetic circuit structure can improve the steady-state performance and the dynamic performance of the rotor, is favorable for improving the power density and the overload capacity of the motor, and is favorable for realizing weak magnetic expansion. On the other hand, the method is beneficial to improving the coverage area of the permanent magnet in the circumferential direction of the rotor core, and further the technical effect of improving the performance of the motor is achieved.

When the arrangement mode of the permanent magnets is V-shaped, each V-shaped is a magnetic pole, namely two permanent magnets form a magnetic pole; thus, the sum of the widths of the two permanent magnets forming a "V" shape is w; further preferably, the width of each permanent magnet is w/2.

Therefore, when the pole number 2P value of the rotor is fixed, the number of permanent magnets required for the V-shaped arrangement is twice the number of permanent magnets required for the in-line arrangement.

According to some embodiments of the utility model, the iron core is provided with a magnet slot matched with the permanent magnet.

The utility model can adapt to the motors with the two arrangement modes by controlling parameters, has wide application range and is more beneficial to commercial popularization.

According to some embodiments of the utility model, the magnet slot is "in-line".

According to some embodiments of the utility model, the magnet slot is V-shaped.

Therefore, the magnet groove can accommodate the permanent magnet and plays a limiting role on the permanent magnet. Further, the excitation effect of the permanent magnet can be better exerted.

According to some embodiments of the utility model, the motor further comprises a magnetic bridge;

preferably, the magnetic separation bridge is arranged at two ends of the width direction of the permanent magnet. Therefore, the magnetic isolation effect can be achieved, and the possibility of magnetic circuit disorder and magnetic leakage problem occurrence in the rotor assembly can be effectively reduced. And further, the motor assembly structure is optimized, and the technical effects of practicality and reliability are improved.

According to some embodiments of the utility model, the motor has an efficiency of 90% or more at 1800 rps.

According to some preferred embodiments of the utility model, the motor has an efficiency of 90.1% or more at 1800 rps. For example, it may be about 90.2%.

According to some embodiments of the utility model, the motor has an efficiency of 92% or more at 3600 rps.

According to some preferred embodiments of the utility model, the motor has an efficiency of 92.3% or more at 3600 rps. For example, it may be about 92.5%.

According to some embodiments of the utility model, the demagnetizing rate of the motor is less than or equal to 3% at 130 ℃/24A.

According to some preferred embodiments of the utility model, the demagnetizing rate of the motor is between 2 and 2.9% at 130 ℃/24A.

According to some preferred embodiments of the utility model, the demagnetizing rate of the motor is about 2.23%, 2.86% or 2.78% at 130 ℃/24A.

According to an embodiment of the second aspect of the present utility model, a compressor is presented, comprising the motor.

The compressor adopts all the technical schemes of the motor of the embodiment, so that the compressor has at least all the beneficial effects brought by the technical scheme of the motor of the embodiment.

According to an embodiment of the third aspect of the present utility model, a temperature regulating device is presented, comprising the compressor.

The temperature regulating device adopts all the technical schemes of the compressor of the embodiment, so that the temperature regulating device has at least all the beneficial effects brought by the technical schemes of the compressor of the embodiment.

According to some embodiments of the utility model, the temperature regulating device comprises at least one of a refrigerator and an air conditioner.

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

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural view of motors provided in embodiment 1, embodiment 3 and comparative example 2 of the present utility model;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a schematic view of the dimensions of the motors provided in example 1, example 3 and comparative example 2 of the present utility model;

fig. 4 is a schematic structural view of the motor provided in embodiment 2 and comparative example 1 of the present utility model;

FIG. 5 is an enlarged view of a portion of FIG. 4;

fig. 6 is a schematic view of the dimensions of the motor provided in example 2 and comparative example 1 of the present utility model.

Reference numerals:

a rotor 100;

a core 110, a magnet slot 111;

a permanent magnet 120;

stator 200, stator slot 210.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, the description of first, second, etc. is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be determined reasonably by a person skilled in the art in combination with the specific content of the technical solution.

Unless otherwise stated, in the permanent magnet of the embodiment, except cerium element, the sum of praseodymium and neodymium elements is 25wt%, dysprosium is 1.5wt%, cobalt is 1.0wt%, and the rest elements are iron.

Example 1

The present embodiment provides a motor, which is shown with reference to fig. 1 to 3, specifically, the motor is composed of a rotor 100 and a stator 200 surrounding the rotor 100;

the stator 200 is provided with 12 stator slots 210.

Wherein, the rotor 100 includes an iron core 110 and a permanent magnet 120 provided on the iron core 110;

the width of the air gap of the motor is delta; the number of poles of the magnetic poles in the rotor 100 is 2P;

the permanent magnet 120 contains x% cerium by mass;

the permanent magnet 120 has a thickness h; the sum of the widths of the permanent magnets 120 in each pole is w;

wherein each parameter should satisfy the following formulas:

1+δ≤h≤1.4+δ (1)；

3≤23*h-25 (2)；

22.5≤2P*h*w/5≤77 (3)；

h. the units of w, and delta are all mm.

It will be appreciated that the permanent magnets 120 are arranged in a "V-shape" as shown in fig. 1 to 3; thus, the width of each permanent magnet 120 is w/2. The permanent magnet 120 is selected to be 42SH, and the size is specifically 30mm x 8.4mm x 1.6mm.

It is further understood that the iron core 110 is provided with a magnet slot 111 having a shape matching that of the permanent magnet 120.

It will be further appreciated that, in order to reduce the damage caused by magnetic leakage, the motor may further be provided with magnetic bridges (not shown in fig. 1 and 3) at both ends of the permanent magnet 120 in the width direction.

Specifically, in this embodiment, parameters of the motor are shown in table 1.

Table 1 parameters of the motor in example 1

Parameters (parameters)	h/mm	w/mm	δ/mm	2P	x％
						Example 1	1.6	8.4×2＝16.8	0.5	8	6％

Substituting the parameters in table 1 into the formula yields:

3≤23*1.6-25＝11.8；

1+0.5＝1.5≤1.6≤1.4+0.5＝1.9；

22.5≤8*1.6*16.8/5＝43.0008≤77。

that is, the parameters defined in this embodiment satisfy the requirements of the formulas (1) to (3).

The number of poles and the size of the display in fig. 1 to 3 are schematic, and specific numerical values cannot be read directly from the drawings.

Example 2

The present embodiment provides a motor, as shown in fig. 4 to 6, specifically, the motor is composed of a rotor 100 and a stator 200 surrounding the rotor 100;

the stator 200 is provided with 12 stator slots 210.

the permanent magnet 120 contains x% cerium by mass;

wherein each parameter should satisfy the following formulas:

1+δ≤h≤1.4+δ (1)；

3≤23*h-25 (2)；

22.5≤2P*h*w/5≤77 (3)；

h. the units of w, and delta are all mm.

It can be appreciated that the permanent magnets 120 are arranged in a "straight" shape; thus, the width of each permanent magnet 120 is w. The permanent magnet 120 is selected to be 42SH in size, and the size is 30mm, 18.8mm and 1.8mm.

It will be further appreciated that, in order to reduce the damage caused by magnetic leakage, the motor may be further provided with magnetic bridges (not shown) at both ends of the permanent magnet 120 in the width direction.

Specifically, in this embodiment, parameters of the motor are shown in table 2.

Table 2 parameters of the motor in example 2

Parameters (parameters)	h/mm	w/mm	δ/mm	2P	x％
						Example 2	1.8	18.8	0.5	6	6％

Substituting the parameters in table 2 into the formula yields:

3≤23*1.8-25＝16.4；

1+0.5＝1.5≤1.8≤1.4+0.5＝1.9；

22.5≤6*1.8*18.8/5＝40.608≤77。

The number of poles and the size of the display in fig. 4 to 6 are schematic, and specific values cannot be read directly from the drawings.

Example 3

the stator 200 is provided with 12 stator slots 210.

the permanent magnet 120 contains x% cerium by mass;

wherein each parameter should satisfy the following formulas:

1+δ≤h≤1.4+δ (1)；

3≤23*h-25 (2)；

22.5≤2P*h*w/5≤77 (3)；

h. the units of w, and delta are all mm.

The parameters of the motors were slightly different, and the specific parameters are shown in table 3:

table 3 parameters of the motor in example 3

Parameters (parameters)	h/mm	w/mm	δ/mm	2P	x％
						Example 3	1.6	8.4*2＝16.8	0.5	8	5％

Substituting the parameters in table 3 into the formula yields:

3≤23*1.6-25＝11.8；

1+0.5＝1.5≤1.6≤1.4+0.5＝1.9；

22.5≤8*1.6*16.8/5＝43.0008≤77。

Comparative example 1

The present comparative example provides a motor, as shown with reference to fig. 4 to 6, specifically, the motor is composed of a rotor 100 and a stator 200 surrounding the rotor 100;

the stator 200 is provided with 12 stator slots 210.

the permanent magnet 120 contains x% cerium by mass;

Specifically, in this comparative example, parameters of the motor are shown in table 4.

Table 4 parameters of the motor of comparative example 1

Parameters (parameters)	h/mm	w/mm	δ/mm	2P	x％
						Comparative example 1	1.3	17.4	0.5	6	5％

Substituting the parameters in table 4 into formulas (1) to (3) yields:

1+δ=1+0.5=1.5 > h=1.3, i.e., the parameters in this comparative example do not satisfy the requirement of formula (1);

2.5 x+15=2.5 x 5+15=27.5 < 22.5, and does not satisfy the requirement of formula (3).

Comparative example 2

The present comparative example provides a motor, which is shown with reference to fig. 1 to 3, and in particular, the motor is composed of a rotor 100 and a stator 200 surrounding the rotor;

the stator 200 is provided with 12 stator slots 210.

Wherein, the rotor 100 includes an iron core 110 and a permanent magnet 120 provided on the iron core;

the permanent magnet 120 contains x% cerium by mass;

In this comparative example, specific parameters of the motor are shown in table 5:

table 5 parameters of the motor in comparative example 2

Parameters (parameters)	h/mm	w/mm	δ/mm	2P	x％
						Comparative example 2	1.6	8.4×2＝16.8	0.5	8	11％

Substituting the parameters in table 1 into the formula yields:

3≤23*1.6-25＝11.8；

1+0.5＝1.5≤1.6≤1.4+0.5＝1.9；

22.5≤8*1.6*16.8/5＝43.0008≤77。

namely, the parameters defined in this comparative example satisfy the requirements of the formulas (1) to (3).

Test case

This test example tests the performance of the motors provided in examples 1-3 and comparative examples 1-2, and the specific test conditions and test results are shown in table 6.

Table 6 the performance of the motors provided in examples 1-3 and comparative examples 1-2

The results obtained in Table 6 are measured values, wherein the intrinsic coercivity and cerium content, the amounts of other heavy rare earths, and the magnet manufacturer production process are all related. Although the cerium content was slightly different in examples 1 to 3 and comparative example 1, the intrinsic coercive force of the magnets used in the specific embodiments was 1710KA/m.

In table 6, the comparison of the results of example 1 and example 3 shows that the efficiency of the motor is hardly changed when the Ce content is within the range required by the present utility model, and the anti-demagnetization performance tends to be reduced as the Ce content is increased, and the final anti-demagnetization performance is still excellent, thereby meeting the industrial and daily use requirements.

In table 6, the comparison of the results of examples 1 to 3 and comparative example 1 shows that, although the doping amount of Ce satisfies the range required by the present utility model, the parameters such as thickness, width and air gap width do not satisfy the requirements of formulas (1) to (3), that is, the shape and arrangement position of the permanent magnet are not within the range required by the present utility model, the efficiency and demagnetization resistance of the motor under each condition are low, and the actual production requirements are not satisfied.

In table 6, as is clear from comparison of the results of examples 1 to 3 and comparative example 2, although the cerium doping amount of the permanent magnet of comparative example 1 exceeds the commercially conventional cerium doping ratio, excellent demagnetization resistance was still obtained when the structural relationships and the like satisfy the requirements of the formulae (1) to (3). If the structural relationship does not satisfy the constraints of the formulae (1) to (3), the resulting motor will be further degraded in demagnetization resistance at the cerium content.

In addition, the gram weight unit price of the conventional praseodymium-neodymium magnet is 0.38 yuan/gram and the gram weight unit price of the cerium-containing magnet (calculated when the cerium doping amount is 5 wt%) is 0.279 yuan/gram under the 42SH brand according to the current price of the rare earth bulk material. For example, in the embodiment 2, the weight of each permanent magnet is about 3.1g, and 16 permanent magnets are used in one motor, and the material cost of each motor can be reduced by about 5 yuan by adopting the Ce-doped permanent magnet to replace the neodymium-iron-boron magnet in the traditional technology.

In summary, the motor provided by the utility model can furthest improve the comprehensive properties such as anti-demagnetization performance and the like of the motor by limiting the shape of the permanent magnet, the width of the air gap between the stator and the rotor and the number of poles of the magnetic poles in the motor, and on the basis, if 3-10%, particularly 5-6%, of cerium is doped in the permanent magnet, the manufacturing cost of the motor is obviously reduced.

It is further expected that the cost of the compressor including the above-described motor and the temperature adjusting apparatus including the above-described compressor, such as a refrigerator or an air conditioner, will be reduced without impairing the performance thereof due to the reduction in the cost of the motor while maintaining the performance.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. An electric machine comprising a rotor and a stator surrounding the rotor, the rotor comprising an iron core and a permanent magnet comprising cerium provided on the iron core; the method is characterized in that:

the thickness of the permanent magnet is h; the sum of the widths of the permanent magnets in each magnetic pole is w;

and:

1+δ≤h≤1.4+δ (1)；

3≤23*h-25 (2)；

22.5≤2P*h*w/5≤77 (3)；

wherein, the units of w, h and delta are all mm;

the thickness h of the permanent magnet is 1.3-2.2 mm.

2. The electric machine of claim 1, wherein the number of poles 2P, the thickness h of the permanent magnet, and the width w of the permanent magnet satisfy the following formula:

40≤2P*h*w/5≤77 (3)。

3. the electric machine according to claim 2, characterized in that the number of poles 2P of the magnetic poles, the thickness h of the permanent magnets and the width w of the permanent magnets satisfy the following formula:

22.5≤2P*h*w/5≤49 (3)。

4. a motor according to any one of claims 1 to 3, wherein the stator is provided with stator slots.

5. A machine according to any one of claims 1 to 3, wherein the rotor has a pole count of 2P ≡6.

6. A machine according to any one of claims 1 to 3, wherein the air gap width δ is in the range 0.3 to 0.8mm.

7. The motor of claim 1, wherein the sum w of the widths of the permanent magnets has a value in the range of 15-22 mm.

8. A motor according to any one of claims 1 to 3, wherein the permanent magnets are arranged in a "straight" pattern on the core.

9. A motor according to any one of claims 1 to 3, wherein the permanent magnets are arranged in a V-shape on the core.

10. A compressor comprising an electric motor according to any one of claims 1 to 9.

11. A temperature regulating apparatus comprising the compressor of claim 10.

12. The temperature-regulating device of claim 11, wherein the temperature-regulating device comprises at least one of a refrigerator and an air conditioner.