Permanent magnet synchronous motor and compressor

Abstract

The invention provides a permanent magnet synchronous motor and a compressor, and the permanent magnet synchronous motor comprises a stator which comprises a stator core and a stator winding; the stator windings are wound on the stator teeth, and the sum of the areas of the plurality of stator windings in the stator slots in the circumferential direction is S1; the motor further comprises a rotor, the sum of the areas of the multiple pieces of magnetic steel in the circumferential direction is S2, and S1 and S2 meet the condition that 15 cm < 6 > < = S1S22 < = 25 cm < 6 >, the unit of S1 and S2 is cm < 2 >, and 2.5 < = S1 / S2 < = 4.2. The number Q of stator grooves is larger than or equal to 15, the pole pair number of the rotor is P, and the pole number 2P of the rotor is larger than or equal to 10. According to the permanent magnet motor, the problem that a permanent magnet motor in the prior art cannot improve the motor efficiency and reduce the cost can be solved, the motor efficiency can be improved while a low-cost structure is realized, and the cost performance of the motor is improved.

Description

Technical Field

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

[0002] Compared with traditional electromagnetic motors, permanent magnet motors have the characteristics of simple structure, small size, light weight, large output torque and reliable operation. They have been widely used in daily life, industrial and agricultural production and military.

[0003] With the development of science and technology and the progress of human society, designing cost-effective and energy-saving motors for applications such as household appliances is of great significance to improving people's living and production standards and improving the efficiency of enterprises.

[0004] In a compressor, the motor is the main energy-consuming component, and its efficiency determines its energy consumption. Therefore, improving the motor efficiency is conducive to reducing the energy consumption of the compressor, which is of great significance for saving electricity and protecting the links and achieving sustainable energy development.

[0005] With the more and more extensive research on compressor motors, their various performances have been gradually improved. It is of great application value to study new motors that combine the advantages of high torque density, high reliability, high fault tolerance and low torque pulsation.

[0006] Since the permanent magnet motors in the prior art have technical problems such as being unable to effectively improve motor efficiency while reducing costs, the present invention studies and designs a permanent magnet synchronous motor and a compressor. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the permanent magnet motor in the prior art that it cannot effectively improve the motor efficiency and reduce the cost at the same time, thereby providing a permanent magnet motor and a compressor.

[0008] In order to solve the above problems, the present invention provides a permanent magnet synchronous motor, which includes:

[0009] A stator, comprising a stator core and a stator winding,

[0010] The stator core includes stator teeth and stator slots. The stator teeth are multiple and spaced apart along the circumference of the stator core. The stator slots are located between two adjacent stator teeth. The stator winding is wound around the stator teeth so that at least part of the stator winding is located in the stator slots.

[0011] The sum of the areas of the plurality of stator windings located in the stator slots in the circumferential direction within the projection plane of the axial end surface of the stator core is S1;

[0012] The stator further comprises a rotor, the rotor being located on the inner periphery of the stator core. The rotor comprises a rotor core and magnets. The rotor core is provided with magnet slots. The magnets are arranged in the magnet slots. Within the projection plane of the axial end face of the rotor core, the sum of the areas of the plurality of magnets in the circumferential direction is S2.

[0013] And: S1 and S2 satisfy: 15cm^6≤S1S2 2 ≤25cm^6, where the units of S1 and S2 are both cm^2, and 2.5≤S1 / S2≤4.2;

[0014] The number of stator slots Q is ≥15, the number of pole pairs of the rotor is P, and the number of rotor poles 2P is ≥10.

[0015] In some embodiments,

[0016] The material of the stator winding is copper, and the material of the magnetic steel is neodymium iron boron.

[0017] In some embodiments,

[0018] The outer diameter of the stator is 90 mm to 110 mm, and the motor stack height H satisfies: 20 mm ≤ H ≤ 40 mm.

[0019] In some embodiments,

[0020] The outer diameter of the stator is the diameter of the outer circle of the stator core, the motor stack height H is the axial length of the stator core, and the inner diameter D1 of the stator core is the diameter of the circle formed by the inner circumferences of the plurality of stator teeth.

[0021] In some embodiments,

[0022] The area of ​​a single magnetic steel is the product of the long side and the wide side of the magnetic steel. The magnetic steel slot also includes two opposite long sides, and the long side of the magnetic steel slot is arranged opposite to the long side of the magnetic steel.

[0023] In some embodiments,

[0024] There is a gap between the inner circumference of the stator core and the outer circumference of the rotor core, forming a motor air gap.

[0025] In some embodiments,

[0026] Stator winding area: Where n is the number of turns, Φ is the diameter of the stator winding wire; the permanent magnet flux of the motor is Where H is the motor stack height, S2 is the magnet area; motor resistance: Control the output torque when id=0: id is the d-axis current value, Is is the effective value of the stator winding current, and the motor copper loss is: W∝I s 2 R.

[0027] In some embodiments,

[0028] Integrating the output torque T and the motor copper loss W yields: T 2 ∝WHS1S2 2 , where T is the output torque, W is the copper loss, H is the motor stack height, S1 is the stator winding area, and S2 is the magnet area. For the same output torque and the same motor efficiency, HS1S2 2 is a constant k, and k is the motor efficiency constant.

[0029] The present invention also provides a compressor, which includes the aforementioned permanent magnet synchronous motor.

[0030] The permanent magnet synchronous motor and compressor provided by the present invention have the following beneficial effects:

[0031] The present invention sets the sum of the areas of the plurality of stator windings in the stator slots S1 and the sum of the areas of the plurality of magnetic steels in the circumferential direction S2 to satisfy the relationship: 15cm^6≤S1S2 2 ≤25cm^6, where the units of S1 and S2 are both cm^2, and 2.5≤S1 / S2≤4.2, it is possible to improve the motor efficiency while meeting the above two numerical ranges, while reducing the cost rate, thereby improving the cost performance of the motor; effectively solving the problem in the prior art that the permanent magnet motor cannot reduce the cost while improving the motor efficiency, achieving a low-cost structure while also improving the motor efficiency and improving the cost performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 1 is a top view of the permanent magnet synchronous motor of the present invention;

[0033] Figure 2 yes Figure 1 A partial enlarged view of the stator winding portion of the motor;

[0034] Figure 3 yes Figure 1 A partial enlarged view of the rotor magnetic steel part;

[0035] Figure 4 The motor of the present invention is in S1S2 2 =15cm^6 and the motor efficiency effect curve when the stack height is 30mm;

[0036] Figure 5 The motor of the present invention is in S1S2 2=15cm^6 and the motor cost-effectiveness curve when the stack height is 30mm;

[0037] Figure 6 The motor of the present invention is in S1S2 2 =20cm^6 and the stack height is 30mm.

[0038] Figure 7 The motor of the present invention is in S1S2 2 =20cm^6 and the stack height is 30mm.

[0039] Figure 8 The motor of the present invention is in S1S2 2 =25cm^6 and the stack height is 30mm.

[0040] Figure 9 The motor of the present invention is in S1S2 2 The motor cost-effectiveness curve when the stack height is 30mm and the width is 25cm^6.

[0041] The reference numerals indicate:

[0042] 100. Stator; 1. Stator core; 2. Stator winding; 200. Rotor; 3. Rotor core; 4. Magnet; 5. Stator teeth; 6. Stator slots; 7. Magnet slots. DETAILED DESCRIPTION

[0043] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Unless otherwise specifically stated, the relative arrangement of the parts and steps, the numerical expressions and the numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0046] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0049] like Figure 1-9As shown, the present invention provides a permanent magnet synchronous motor, which includes:

[0050] The stator 100 includes a stator core 1 and a stator winding 2.

[0051] The stator core 1 includes stator teeth 5 and stator slots 6. The stator teeth 5 are multiple and arranged at intervals along the circumference of the stator core 1. The stator slots 6 are located between two adjacent stator teeth 5. The stator winding 2 is wound around the stator teeth 5 so that at least part of the stator winding is located in the stator slots 6.

[0052] The sum of the areas of the plurality of stator windings 2 located in the stator slots 6 in the circumferential direction within the projection plane of the axial end surface of the stator core 1 is S1;

[0053] The stator core 1 further includes a rotor 200, which is located on the inner periphery of the stator core 1. The rotor 200 includes a rotor core 3 and magnets 4. The rotor core 3 is provided with magnet slots 7. The magnets 4 are arranged in the magnet slots 7. In the projection plane of the axial end face of the rotor core 3, the sum of the areas of the plurality of magnets 4 in the circumferential direction is S2.

[0054] And: S1 and S2 satisfy: 15cm^6≤S1S2 2 ≤25cm^6, where the units of S1 and S2 are both cm^2, and 2.5≤S1 / S2≤4.2;

[0055] The number Q of the stator slots 6 is ≥15, the number of pole pairs of the rotor 200 is P, and the number of rotor poles 2P is ≥10.

[0056] The present invention sets the sum of the areas of the plurality of stator windings in the stator slots S1 and the sum of the areas of the plurality of magnetic steels in the circumferential direction S2 to satisfy the relationship: 15cm^6≤S1S2 2 ≤25cm^6, where the units of S1 and S2 are both cm^2, and 2.5≤S1 / S2≤4.2, it is possible to improve the motor efficiency while meeting the above two numerical ranges, while reducing the cost rate, thereby improving the cost performance of the motor; effectively solving the problem in the prior art that the permanent magnet motor cannot reduce the cost while improving the motor efficiency, achieving a low-cost structure while also improving the motor efficiency and improving the cost performance of the motor.

[0057] The present invention can distribute the motor copper material and magnetic steel material (optimize the distribution of motor materials) by the relationship between the stator winding area and the magnetic steel area when the motor efficiency is equivalent, thereby reducing the motor material cost and improving the motor cost performance.

[0058] The present invention is preferably used for 15-slot, 10-pole motors. Due to the large number of poles (10), the motor has high iron loss. At higher stack heights (above 40 mm), the iron loss is higher than the copper loss, and the motor efficiency advantage is not obvious. The present invention preferably uses 15-slot, 10-pole motors, which have a higher cost-effectiveness (motor efficiency / motor cost) at low stack heights.

[0059] In some embodiments,

[0060] The material of the stator winding 2 is copper, and the material of the magnetic steel 4 is neodymium iron boron.

[0061] The present invention can distribute the motor copper material and magnetic steel material (optimize the distribution of motor materials) by the relationship between the stator winding area and the magnetic steel area when the motor efficiency is equivalent, thereby reducing the motor material cost and improving the motor cost performance.

[0062] In some embodiments,

[0063] The outer diameter of the stator 100 is 90 mm to 110 mm, and the motor stack height H satisfies: 20 mm ≤ H ≤ 40 mm.

[0064] The present invention provides a multi-slot, multi-pole motor solution. In a low-stack 15-slot, 10-pole solution, the motor stack height (H) satisfies the following conditions: 20 mm ≤ H ≤ 40 mm. While maintaining comparable motor efficiency, this approach reduces motor material requirements by optimizing the stator winding area (S1) and rotor magnet area (S2). This improves motor efficiency while also reducing costs, thereby enhancing the motor's cost-effectiveness.

[0065] In some embodiments,

[0066] The outer diameter of the stator 100 is the outer diameter of the stator core 1 , the motor stack height H is the axial length of the stator core 1 , and the inner diameter D1 of the stator core 1 is the diameter of the circle formed by the inner circumferences of the plurality of stator teeth 5 .

[0067] In some embodiments,

[0068] The area of ​​a single magnetic steel 4 is the product of the long side and the wide side of the magnetic steel 4 . The magnetic steel slot 7 also includes two opposite long sides. The long side of the magnetic steel slot 7 is arranged opposite to the long side of the magnetic steel 4 .

[0069] In some embodiments,

[0070] There is a gap between the inner circumference of the stator core 1 and the outer circumference of the rotor core 3, forming a motor air gap.

[0071] The present invention provides a permanent magnet synchronous motor structure. The entire motor structure mainly includes a stator 100, a rotor 200, a magnetic steel 4, and a stator winding 2 (copper wire). The stator core 1 is provided with stator slots 6 for placing the copper wire, and the rotor is provided with magnetic steel slots 7 for placing the magnetic steel. There is a gap between the inner diameter of the stator and the outer diameter of the rotor, forming an air gap of the motor.

[0072] In some embodiments,

[0073] Stator winding area: Where n is the number of turns, Φ is the diameter of the stator winding wire; the permanent magnet flux of the motor is Where H is the motor stack height, S2 is the magnet area; motor resistance: Control the output torque when id=0: id is the d-axis current value, Is is the effective value of the stator winding current, and the motor copper loss is: W∝I s 2 R.

[0074] In some embodiments,

[0075] Integrating the output torque T and the motor copper loss W yields: T 2 ∝WHS1S2 2 , where T is the output torque, W is the copper loss, H is the motor stack height, S1 is the stator winding area, and S2 is the magnet area. For the same output torque and the same motor efficiency, HS1S2 2 is a constant k, and k is the motor efficiency constant.

[0076] In the present invention, when the motor is running at low frequency, the difference in motor iron loss is small. For the convenience of calculation, the difference in copper wire at the stator end is ignored. The output torque T and the motor copper loss W are integrated to obtain: T 2 ∝WHS1S2 2 , where T is the output torque, W is the copper loss, H is the motor stack height, S1 is the winding area, and S2 is the magnet area. For the same output torque and equivalent motor efficiency, HS1S2 2 is a constant k, which can be regarded as the motor efficiency constant. To ensure motor efficiency and consider motor cost, S1 and S2 satisfy: 15cm^6≤S1S2 2 ≤25cm^6. Figure 1 As shown in the motor schematic diagram, copper wire windings are wound around the motor stator teeth, and magnets are installed in the motor rotor magnetic slots. Figure 2 The motor stator winding diagram shown in the figure has a stator copper wire winding area of ​​S1. Figure 3 The motor rotor magnet diagram shown has a magnet area of ​​S2. Figure 4 The distribution diagram of motor efficiency and cost performance under different parameters is shown. Based on the S1 / S2 parameters, the motor efficiency and cost performance are better when the S1 / S2 ratio is 2.5≤S1 / S2≤4.2.

[0077] The present invention also provides a compressor, which includes the aforementioned permanent magnet synchronous motor.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A permanent magnet synchronous motor, characterized in that: include: A stator (100), comprising a stator core (1) and a stator winding (2), The stator core (1) comprises stator teeth (5) and stator slots (6), wherein the stator teeth (5) are plural and arranged at intervals along the circumference of the stator core (1), and the stator slots (6) are located between two adjacent stator teeth (5); the stator winding (2) is wound around the stator teeth (5) such that at least part of the stator winding is located in the stator slots (6); The sum of the areas of the plurality of stator windings (2) located in the stator slots (6) in the circumferential direction within the projection plane of the axial end face of the stator core (1) is S1; The invention also includes a rotor (200), wherein the rotor (200) is located on the inner periphery of the stator core (1), and the rotor (200) includes a rotor core (3) and magnetic steel (4), wherein a magnetic steel slot (7) is provided on the rotor core (3), and the magnetic steel (4) is arranged in the magnetic steel slot (7), and within the projection plane of the axial end face of the rotor core (3), the sum of the areas of the plurality of magnetic steels (4) in the circumferential direction is S2, And: S1 and S2 satisfy: 15cm^6≤S1S2 2 ≤25cm^6, where the units of S1 and S2 are both cm^2, and 2.5≤S1 / S2≤4.2; The number Q of the stator slots (6) is ≥15, the number of pole pairs of the rotor (200) is P, and the number of rotor poles 2P is ≥10.

2. The permanent magnet synchronous motor according to claim 1, characterized in that: The material of the stator winding (2) is copper, and the material of the magnetic steel (4) is neodymium iron boron.

3. The permanent magnet synchronous motor according to claim 1, characterized in that: The outer diameter of the stator (100) is 90 mm to 110 mm, and the motor stack height H satisfies: 20 mm ≤ H ≤ 40 mm.

4. The permanent magnet synchronous motor according to claim 3, characterized in that: The outer diameter of the stator (100) is the diameter of the outer circle of the stator core (1), the motor stack height H is the axial length of the stator core (1), and the inner diameter D1 of the stator core (1) is the diameter of the circle formed by the inner circumference of the plurality of stator teeth (5).

5. The permanent magnet synchronous motor according to claim 1, characterized in that: The area of ​​a single magnetic steel (4) is the product of the long side and the wide side of the magnetic steel (4), and the magnetic steel slot (7) also includes two opposite long sides, and the long side of the magnetic steel slot (7) is arranged opposite to the long side of the magnetic steel (4).

6. The permanent magnet synchronous motor according to claim 1, characterized in that: There is a gap between the inner circumference of the stator iron core (1) and the outer circumference of the rotor iron core (3), forming an air gap of the motor.

7. The permanent magnet synchronous motor according to claim 1, characterized in that: Stator winding area: Where n is the number of turns, Φ is the diameter of the stator winding wire; the permanent magnet flux of the motor is Where H is the motor stack height, S2 is the magnet area; motor resistance: Control the output torque when id=0: id is the d-axis current value, Is is the effective value of the stator winding current, and the motor copper loss is: W∝I s 2 R.

8. The permanent magnet synchronous motor according to claim 7, characterized in that: Integrating the output torque T and the motor copper loss W yields: T 2 ∝WHS1S2 2 , where T is the output torque, W is the copper loss, H is the motor stack height, S1 is the stator winding area, and S2 is the magnet area. For the same output torque and the same motor efficiency, HS1S2 2 is a constant k, and k is the motor efficiency constant.

9. A compressor, characterized in that: The permanent magnet synchronous motor comprises the permanent magnet synchronous motor according to any one of claims 1 to 8.

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