A surface mounted internal permanent magnet synchronous motor

Abstract

The present invention discloses a surface mounted internal permanent magnet synchronous motor, comprising a stator and a rotor, wherein the stator is coated on the outer periphery of the rotor; 2N surface mounted permanent magnets are evenly spaced circumferentially on the outer periphery of the rotor, and the magnetism of two adjacent surface mounted permanent magnets is opposite, where N is an integer and ≥1; 2N Y-type permanent magnet groups are spaced circumferentially inside the rotor, and each Y-type permanent magnet group is located between two corresponding adjacent surface mounted permanent magnets, and the magnetism of two adjacent Y-type permanent magnet groups is opposite. The present invention has a higher magnetization efficiency, which makes the motor have better performance and greatly improves the output torque of the motor.

Description

Technical Field

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

[0002] In the fields of elevator traction machines, electrical engineering and magnetic materials, the output torque of the motor is one of the most important performance indicators. The size of the output torque directly determines the driving ability and efficiency of the motor in practical applications. At present, the permanent magnet synchronous motor used in the known elevator traction machine is usually composed of a rotor, a stator, a permanent magnet, a winding, etc. The traditional motor structure includes a surface-mounted rotor and a built-in rotor, wherein the output torque of the surface-mounted rotor is lower, while the output torque of the built-in rotor is higher. In order to improve the output torque of the motor, the existing technical solutions are mainly achieved by improving the rotor structure. A common method is to place a built-in V-type permanent magnet inside the surface-mounted permanent magnet rotor. This structure can significantly improve the output torque by optimizing the magnetic field distribution. In addition, there are some other technical solutions, such as increasing the magnetization strength of the rotor material, optimizing the design parameters of the motor, etc., which can also improve the output torque to a certain extent.

[0003] Although existing technical solutions can improve the output torque of the motor to a certain extent, these solutions all have certain limitations. For example, increasing the magnetization strength of the rotor material may lead to an increase in material costs; optimizing the design parameters of the motor requires a lot of experiments and calculations, which takes a long time and is costly. In addition, these solutions can only improve the output torque to a certain extent, but cannot fundamentally solve the problem of low output torque of the surface-mounted rotor.

[0004] Therefore, how to find a more efficient and economical technical solution to increase the output torque of the motor is an urgent problem to be solved in this field. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing permanent magnet synchronous motor has the problem of low output torque of the surface-mounted rotor. This is because the permanent magnets of the traditional surface-mounted rotor are directly attached to the rotor surface, and its magnetic field distribution is relatively dispersed, resulting in a small air gap magnetic density, resulting in a low output torque, which cannot meet the needs of certain applications. In addition, some existing technologies can significantly improve the output torque by placing built-in V-type permanent magnets inside the surface-mounted permanent magnet rotor, but this method is relatively expensive, which limits its application in large-scale production. In view of this, the present invention proposes a surface-mounted built-in permanent magnet synchronous motor, which significantly improves the output torque under the same amount of permanent magnets, and when the torque requirements are consistent, the amount of permanent magnets used is lower, and the cost is lower.

[0006] The technical problem to be solved by the present invention can be achieved by adopting the following technical solutions:

[0007] A surface mounted internal permanent magnet synchronous motor comprises a stator and a rotor, wherein the stator is wrapped around the outer circumference of the rotor;

[0008] 2N surface-mounted permanent magnets are evenly spaced circumferentially arranged on the outer circumferential surface of the rotor, and the magnetic properties of two adjacent surface-mounted permanent magnets are opposite, and N is an integer and is ≥1;

[0009] 2N Y-shaped permanent magnet groups are arranged at intervals in the inner circumferential direction of the rotor, each Y-shaped permanent magnet group is located between two corresponding adjacent surface-mounted permanent magnets, and the magnetic properties of the two adjacent Y-shaped permanent magnet groups are opposite.

[0010] In a preferred embodiment of the present invention, 2N rotor surface planes uniformly arranged in the circumferential direction are formed on the outer circumferential surface of the rotor, and the 2N surface-mounted permanent magnets include N first surface-mounted permanent magnets and N second surface-mounted permanent magnets. The N first surface-mounted permanent magnets and the N second surface-mounted permanent magnets are pasted on the 2N rotor surface planes in a staggered arrangement, and the magnetization direction of the first surface-mounted permanent magnet is opposite to the magnetization direction of the second surface-mounted permanent magnet.

[0011] In a preferred embodiment of the present invention, 2N Y-type permanent magnet slots are evenly spaced apart in the inner circumferential direction of the rotor, and the 2N Y-type permanent magnet groups include N first Y-type permanent magnet groups and N second Y-type permanent magnet groups, and the N first Y-type permanent magnet groups and the N second Y-type permanent magnet groups are installed in the 2N Y-type permanent magnet slots in a staggered arrangement.

[0012] In a preferred embodiment of the present invention, each Y-shaped permanent magnet slot includes a radial permanent magnet slot, a first oblique permanent magnet slot and a second oblique permanent magnet slot, the radial permanent magnet slot is away from the center axis of the rotor relative to the first oblique permanent magnet slot or the second oblique permanent magnet slot, and the first oblique permanent magnet slot and the second oblique permanent magnet slot are arranged symmetrically about the center line of the radial permanent magnet slot and are connected to the radial permanent magnet slot.

[0013] In a preferred embodiment of the present invention, the end of the radial permanent magnet slot away from the central axis of the rotor passes through the outer peripheral surface of the rotor and is located between two adjacent rotor surface planes.

[0014] In a preferred embodiment of the present invention, each first Y-shaped permanent magnet group includes a first radial permanent magnet, a first oblique permanent magnet and a second oblique permanent magnet, and the first radial permanent magnet, the first oblique permanent magnet and the second oblique permanent magnet are installed in the radial permanent magnet slot, the first oblique permanent magnet slot and the second oblique permanent magnet slot of the corresponding Y-shaped permanent magnet slot;

[0015] Each second Y-shaped permanent magnet group includes a second radial permanent magnet, a third oblique permanent magnet and a fourth oblique permanent magnet, and the second radial permanent magnet, the third oblique permanent magnet and the fourth oblique permanent magnet are installed in the radial permanent magnet slot, the first oblique permanent magnet slot and the second oblique permanent magnet slot of the corresponding Y-shaped permanent magnet slot;

[0016] The magnetization directions of the first radial permanent magnet, the first oblique permanent magnet and the second oblique permanent magnet of the first Y-type permanent magnet group are opposite to the magnetization directions of the second radial permanent magnet, the third oblique permanent magnet and the fourth oblique permanent magnet of the second Y-type permanent magnet.

[0017] In a preferred embodiment of the present invention, the cross-sections of the first radial permanent magnet, the second radial permanent magnet, the first oblique permanent magnet, the second oblique permanent magnet, the third oblique permanent magnet and the fourth oblique permanent magnet are all rectangular, and are magnetized perpendicular to the long side direction.

[0018] In a preferred embodiment of the present invention, end magnetic barriers are respectively arranged at both ends of the first radial permanent magnet or the second radial permanent magnet in the radial permanent magnet slot of each Y-shaped permanent magnet slot; end magnetic barriers are respectively arranged at both ends of the first oblique permanent magnet or the third oblique permanent magnet in the first oblique permanent magnet slot of each Y-shaped permanent magnet slot; end magnetic barriers are respectively arranged at both ends of the second oblique permanent magnet or the fourth oblique permanent magnet in the second oblique permanent magnet slot of each Y-shaped permanent magnet slot; and at the same time, each end magnetic barrier is filled with a magnetic barrier filler.

[0019] In a preferred embodiment of the present invention, a circular magnetic barrier is provided between two adjacent Y-shaped permanent magnet slots and near their ends in the rotor, and the circular magnetic barrier is filled with a magnetic barrier filler.

[0020] In a preferred embodiment of the present invention, a plurality of winding slots are evenly spaced apart in the inner circumferential direction of the stator, and an armature winding is fixedly arranged in each winding slot.

[0021] Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0022] 1. The present invention arranges a circle of surface-mounted permanent magnets circumferentially on the outer circumference of the rotor, and the magnetization directions of two adjacent surface-mounted permanent magnets are opposite, so the magnetization efficiency is higher, and the performance of the motor is better;

[0023] 2. The present invention arranges a plurality of Y-shaped permanent magnet groups at intervals in the circumferential direction inside the rotor, which greatly improves the output torque of the motor;

[0024] 3. The present invention sets a magnetic barrier in each Y-shaped permanent magnet slot and between two adjacent Y-shaped permanent magnet slots, thereby reducing magnetic leakage at the ends of the built-in permanent magnets. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the rotor of the present invention.

[0028] Figure 3 It is a schematic diagram of the structure when the rotor in the present invention does not accommodate permanent magnets.

[0029] Figure 4 yes Figure 1 A partial enlarged view of point A.

[0030] Figure 5 It is a dot-line diagram comparing the output torque of the present invention and other motor structures. DETAILED DESCRIPTION

[0031] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0032] See also Figures 1 to 4 , the figure shows a surface mounted internal permanent magnet synchronous motor, including a stator 100, a rotor 200 and a rotating shaft 300. The stator 100 is coated on the outer periphery of the rotor 200, and the rotor 200 is fixedly connected to the rotating shaft 300.

[0033] A plurality of winding slots 110 are evenly spaced apart in the circumferential direction of the stator 100 , and an armature winding 120 is fixedly disposed in each winding slot 110 .

[0034] 2N surface-mounted permanent magnets are evenly spaced circumferentially on the outer circumferential surface of the rotor 200, and the magnetic properties of two adjacent surface-mounted permanent magnets are opposite, where N is an integer and is ≥ 1. In this embodiment, 20 rotor surface planes 201 evenly arranged circumferentially are formed on the outer circumferential surface of the rotor 200, and correspondingly, there are 20 surface-mounted permanent magnets. The 20 surface-mounted permanent magnets include 10 first surface-mounted permanent magnets 210a and 10 second surface-mounted permanent magnets 210b. The 10 first surface-mounted permanent magnets 210a and 10 second surface-mounted permanent magnets 210b are pasted on 20 rotor surface planes 201 in a staggered arrangement. The magnetization direction of the first surface-mounted permanent magnet 210a is opposite to the magnetization direction of the second surface-mounted permanent magnet 210b, that is, when the magnetization direction of the first surface-mounted permanent magnet 210a is radially inward, then the magnetization direction of the second surface-mounted permanent magnet 210b is radially outward, and vice versa. Of course, the first surface-mounted permanent magnet 210a and the second surface-mounted permanent magnet 210b are not limited to the number in this embodiment, and they should be designed according to the performance of the motor.

[0035] The present invention arranges a circle of surface-mounted permanent magnets circumferentially at intervals on the outer circumference of the rotor 200. The magnetization directions of two adjacent surface-mounted permanent magnets are opposite, and the magnetization efficiency is higher, thereby improving the performance of the motor.

[0036] 2N Y-type permanent magnet groups are arranged at intervals in the circumferential direction of the rotor 200, and each Y-type permanent magnet group is located between two corresponding adjacent surface-mounted permanent magnets, and the magnetic properties of the two adjacent Y-type permanent magnet groups are opposite. In this embodiment, 20 Y-type permanent magnet slots 220 are evenly spaced in the circumferential direction of the rotor 200, and correspondingly, there are 20 Y-type permanent magnet groups 230, which corresponds to the number of surface-mounted permanent magnets. The 20 Y-type permanent magnet groups include 10 first Y-type permanent magnet groups 230a and 10 second Y-type permanent magnet groups 230b, and the 10 first Y-type permanent magnet groups 230a and the 10 second Y-type permanent magnet groups 230b are installed in the 20 Y-type permanent magnet slots 220 in a staggered arrangement.

[0037] See also Figure 3 Each Y-shaped permanent magnet slot 220 includes a radial permanent magnet slot 221, a first oblique permanent magnet slot 222, and a second oblique permanent magnet slot 223. The radial permanent magnet slot 221 is away from the central axis of the rotor 200 relative to the first oblique permanent magnet slot 222 or the second oblique permanent magnet slot 223. The first oblique permanent magnet slot 222 and the second oblique permanent magnet slot 223 are symmetrically arranged about the central line of the radial permanent magnet slot 221 and are connected to the radial permanent magnet slot 221. The end of the radial permanent magnet slot 221 away from the central axis of the rotor 200 passes through the outer peripheral surface of the rotor 200 and is located between two adjacent rotor surface planes 201.

[0038] Each first Y-shaped permanent magnet group 230a includes a first radial permanent magnet 231a, a first oblique permanent magnet 232a and a second oblique permanent magnet 233a. The first radial permanent magnet 231a, the first oblique permanent magnet 232a and the second oblique permanent magnet 233a are installed in the radial permanent magnet slot 221, the first oblique permanent magnet slot 222 and the second oblique permanent magnet slot 223 of the corresponding Y-shaped permanent magnet slot 220.

[0039] Each second Y-type permanent magnet group 230b includes a second radial permanent magnet 231b, a third oblique permanent magnet 232b and a fourth oblique permanent magnet 233b. The second radial permanent magnet 231b, the third oblique permanent magnet 232b and the fourth oblique permanent magnet 233b are installed in the radial permanent magnet slot 221, the first oblique permanent magnet slot 222 and the second oblique permanent magnet slot 223 of the corresponding Y-type permanent magnet slot 220.

[0040] The magnetization directions of the first radial permanent magnet 231a, the first oblique permanent magnet 232a, and the second oblique permanent magnet 233a of the first Y-type permanent magnet group 230a are opposite to the magnetization directions of the second radial permanent magnet 231b, the third oblique permanent magnet 232b, and the fourth oblique permanent magnet 233b of the second Y-type permanent magnet group 230b. The cross sections of the first radial permanent magnet 231a, the second radial permanent magnet 231b, the first oblique permanent magnet 232a, the second oblique permanent magnet 233a, the third oblique permanent magnet 232b, and the fourth oblique permanent magnet 233b are all rectangular, and are all magnetized perpendicular to the long side direction.

[0041] See also Figure 4 When the magnetizing direction of the first surface-mounted permanent magnet 210a is radially outward and the magnetizing direction of the second surface-mounted permanent magnet 210b is radially inward, the magnetizing direction of the first radial permanent magnet 231a is tangentially to the right, the magnetizing direction of the second radial permanent magnet 231b is tangentially to the left, the magnetizing direction of the first oblique permanent magnet 232a is perpendicular to the long side of the rectangle and inward, the magnetizing direction of the second oblique permanent magnet 233a is perpendicular to the long side of the rectangle and outward, the magnetizing direction of the third oblique permanent magnet 232b is perpendicular to the long side of the rectangle and outward, and the magnetizing direction of the fourth oblique permanent magnet 233b is perpendicular to the long side of the rectangle and inward.

[0042] The present invention greatly improves the output torque of the motor by arranging a plurality of Y-shaped permanent magnet groups at circumferential intervals inside the rotor 200 .

[0043] See also Figure 2, end magnetic barriers 240 are respectively arranged at both ends of the first radial permanent magnet 231a or the second radial permanent magnet 231b in the radial permanent magnet slot 221 of each Y-shaped permanent magnet slot 220; end magnetic barriers 240 are respectively arranged at both ends of the first oblique permanent magnet 232a or the third oblique permanent magnet 232b in the first oblique permanent magnet slot 222 of each Y-shaped permanent magnet slot 220; end magnetic barriers 240 are respectively arranged at both ends of the second oblique permanent magnet 233a or the fourth oblique permanent magnet 233b in the second oblique permanent magnet slot 223 of each Y-shaped permanent magnet slot 220. At the same time, each end magnetic barrier 240 is filled with a magnetic barrier filler, and the magnetic barrier filler is preferably epoxy resin, which effectively reduces the leakage magnetic flux at the end of the built-in permanent magnet.

[0044] Furthermore, a circular magnetic barrier 250 is arranged in the rotor 200 between two adjacent Y-shaped permanent magnet slots 220 and near their end positions. Each circular magnetic barrier 250 is filled with a magnetic barrier filler, which is preferably made of epoxy resin, effectively reducing magnetic leakage at the ends of the built-in permanent magnets.

[0045] See also Figure 5 The figure shows a dotted line graph comparing the output torque of the surface-mounted built-in permanent magnet synchronous motor of the present invention and other existing motor structures. It can be seen from the figure that the output torque of the present invention is greater.

[0046] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A surface mounted internal permanent magnet synchronous motor, comprising a stator and a rotor, wherein the stator is wrapped around the outer circumference of the rotor; characterized in that: 2N surface-mounted permanent magnets are evenly spaced circumferentially arranged on the outer circumferential surface of the rotor, and the magnetic properties of two adjacent surface-mounted permanent magnets are opposite, and N is an integer and is ≥1; 2N Y-shaped permanent magnet groups are arranged at intervals in the inner circumferential direction of the rotor, each Y-shaped permanent magnet group is located between two corresponding adjacent surface-mounted permanent magnets, and the magnetic properties of the two adjacent Y-shaped permanent magnet groups are opposite.

2. The surface mounted internal permanent magnet synchronous motor according to claim 1, characterized in that: The outer peripheral surface of the rotor is formed with 2N rotor surface planes which are evenly arranged in the circumferential direction. The 2N surface-mounted permanent magnets include N first surface-mounted permanent magnets and N second surface-mounted permanent magnets. The N first surface-mounted permanent magnets and the N second surface-mounted permanent magnets are pasted on the 2N rotor surface planes in a staggered arrangement. The magnetization direction of the first surface-mounted permanent magnet is opposite to the magnetization direction of the second surface-mounted permanent magnet.

3. The surface mounted internal permanent magnet synchronous motor according to claim 2, characterized in that: The rotor is provided with 2N Y-shaped permanent magnet slots evenly spaced in the inner circumferential direction. The 2N Y-shaped permanent magnet groups include N first Y-shaped permanent magnet groups and N second Y-shaped permanent magnet groups. The N first Y-shaped permanent magnet groups and the N second Y-shaped permanent magnet groups are installed in the 2N Y-shaped permanent magnet slots in a staggered arrangement.

4. The surface mounted internal permanent magnet synchronous motor according to claim 3, characterized in that: Each Y-shaped permanent magnet slot includes a radial permanent magnet slot, a first oblique permanent magnet slot and a second oblique permanent magnet slot. The radial permanent magnet slot is away from the central axis of the rotor relative to the first oblique permanent magnet slot or the second oblique permanent magnet slot. The first oblique permanent magnet slot and the second oblique permanent magnet slot are arranged symmetrically about the center line of the radial permanent magnet slot and are connected to the radial permanent magnet slot.

5. The surface mounted internal permanent magnet synchronous motor according to claim 4, characterized in that: The end of the radial permanent magnet slot away from the central axis of the rotor passes through the outer peripheral surface of the rotor and is located between two adjacent rotor surface planes.

6. The surface mounted interior permanent magnet synchronous motor according to claim 4, characterized in that: Each first Y-shaped permanent magnet group includes a first radial permanent magnet, a first oblique permanent magnet and a second oblique permanent magnet, wherein the first radial permanent magnet, the first oblique permanent magnet and the second oblique permanent magnet are installed in the radial permanent magnet slot, the first oblique permanent magnet slot and the second oblique permanent magnet slot of the corresponding Y-shaped permanent magnet slot; Each second Y-shaped permanent magnet group includes a second radial permanent magnet, a third oblique permanent magnet and a fourth oblique permanent magnet, and the second radial permanent magnet, the third oblique permanent magnet and the fourth oblique permanent magnet are installed in the radial permanent magnet slot, the first oblique permanent magnet slot and the second oblique permanent magnet slot of the corresponding Y-shaped permanent magnet slot; The magnetization directions of the first radial permanent magnet, the first oblique permanent magnet and the second oblique permanent magnet of the first Y-type permanent magnet group are opposite to the magnetization directions of the second radial permanent magnet, the third oblique permanent magnet and the fourth oblique permanent magnet of the second Y-type permanent magnet.

7. The surface mounted interior permanent magnet synchronous motor according to claim 6, characterized in that: The cross sections of the first radial permanent magnet, the second radial permanent magnet, the first oblique permanent magnet, the second oblique permanent magnet, the third oblique permanent magnet and the fourth oblique permanent magnet are all rectangular, and are magnetized perpendicular to the long side direction.

8. The surface mounted interior permanent magnet synchronous motor according to claim 6, characterized in that: In each Y-shaped permanent magnet slot, the radial permanent magnet slot is located at both ends of the first radial permanent magnet or the second radial permanent magnet, and end magnetic barriers are respectively arranged; in each Y-shaped permanent magnet slot, the first oblique permanent magnet slot is located at both ends of the first oblique permanent magnet or the third oblique permanent magnet, and end magnetic barriers are respectively arranged; in each Y-shaped permanent magnet slot, the second oblique permanent magnet slot is located at both ends of the second oblique permanent magnet or the fourth oblique permanent magnet, and end magnetic barriers are respectively arranged; at the same time, each end magnetic barrier is filled with a magnetic barrier filler.

9. The surface mounted interior permanent magnet synchronous motor according to claim 8, characterized in that: A circular magnetic barrier is arranged between two adjacent Y-shaped permanent magnet slots and close to the end positions of the slots in the rotor, and the circular magnetic barrier is filled with a magnetic barrier filler.

10. The surface-mounted interior permanent magnet synchronous motor according to any one of claims 1 to 9, characterized in that: A plurality of winding slots are evenly spaced apart in the circumferential direction of the stator, and an armature winding is fixedly arranged in each winding slot.

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