Cogging-free permanent magnet motor winding structure and cogging-free permanent magnet motor

Abstract

The invention discloses a cogging-free permanent magnet motor winding structure. The cogging-free permanent magnet motor winding structure comprises a stator core and a fixed sleeve, a group of connecting holes which are uniformly distributed along the circumferential direction are formed in the inner surface of the fixed sleeve; a group of heat dissipation pipes are inserted into the connecting holes and are of U-shaped structures; two pins of the heat dissipation pipe are matched with the connecting holes, and the pins abut against the two side faces of the stator iron core and are used for limiting the stator iron core; a winding is arranged on the radiating tube; a capillary tube structure is arranged in the heat dissipation pipe, and the interior of the heat dissipation pipe is divided into an evaporation section, a heat insulation section and a condensation section. And a heat exchange working medium is arranged in the heat dissipation pipe. According to the gullet-free permanent magnet motor winding structure, through a specific structure, 'hypothetical 'stator teeth formed by the radiating tubes are introduced, the problem of winding fixation is solved, and the radiating performance can be remarkably improved; and the structure does not need to be fixed by resin, so that the manufacturing process is simplified, and the production cost is reduced. In addition, the invention also correspondingly provides a cogging-free permanent magnet motor.

Description

Technical Field

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

[0002] As an actuator, the motor is a key factor in achieving energy conversion. Permanent magnet synchronous motors rely on permanent magnet excitation to generate synchronous rotating magnetic fields. They have the characteristics of simple structure, high efficiency, and high power factor. They are widely used in industrial production, transportation, medical and health fields.

[0003] Conventional permanent magnet motors have a tooth structure in the stator core. When the relative position of the stator core teeth and the rotor permanent magnets changes, the magnetic field energy changes, resulting in the generation of cogging torque. Too much cogging torque will lead to worse torque pulsation and vibration noise, and affect the control accuracy of the motor.

[0004] Slotless permanent magnet motors have no slot torque, which makes slotless motors run more smoothly; however, since the stator core has no slots, the windings need to be directly arranged on the smooth stator surface. In order to ensure the stability of the windings during operation and provide necessary insulation protection, the prior art generally uses a resin impregnation method to solidify and protect the windings. For example, Chinese patent document CN207200545U discloses a slotless motor for an implantable axial blood pump, which includes a stator core, a stator winding, a rotor shaft, and a rotor permanent magnet. The stator core is axially stamped from an annular silicon steel sheet, the rotor permanent magnet is a permanent magnet material, and is radially magnetized. The coil of the stator winding is between the stator core and the rotor shaft, the stator winding is pasted on the inner wall of the cylindrical stator core, and the stator core is a slotless structure.

[0005] However, the manufacturing process of the slotless motor with the above structure is relatively complicated, and the resin curing process requires multiple impregnation and heating treatments, which increases the complexity and cost of the manufacturing process; it may also affect the heat dissipation performance of the slotless motor. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present application provides a slotless permanent magnet motor winding structure. The slotless permanent magnet motor winding structure of the present application introduces "imaginary" stator teeth formed by heat pipes through a specific structure, which not only solves the problem of winding fixation, but also significantly improves the heat dissipation performance; and the structure does not need to be fixed with resin, thereby simplifying the manufacturing process and reducing production costs. In addition, the present application also provides a slotless permanent magnet motor.

[0007] For the winding structure, the technical solution of this application is:

[0008] The slotless permanent magnet motor winding structure comprises a stator core and a fixed sleeve sleeved on the outside of the stator core; the stator core and the fixed sleeve are both annular structures, and the outer surface of the stator core is tightly matched with the inner surface of the fixed sleeve; a group of connecting holes evenly distributed along the circumferential direction are respectively provided on the inner surface of the fixed sleeve and on both sides of the stator core; a group of heat dissipation pipes are inserted into the connecting holes, and the heat dissipation pipes are U-shaped and arranged across the stator core; two pins of the heat dissipation pipes are matched with the connecting holes, and the pins are against the two side surfaces of the stator core for limiting the stator core; windings are provided on the heat dissipation pipes; a capillary structure is provided inside the heat dissipation pipes, and the inside of the heat dissipation pipes is divided into an evaporation section, an insulation section and a condensation section; a heat exchange medium is provided inside the heat dissipation pipes.

[0009] Compared with the prior art, the slotless permanent magnet motor winding structure of the present application forms "imaginary" stator teeth by arranging a heat dissipation tube across the stator core on a fixed sleeve, so that the winding can be wound on the heat dissipation tube, thereby solving the winding fixing problem of the slotless structure; and a capillary structure is provided inside the heat dissipation tube. When working, the evaporation section of the heat dissipation tube absorbs the heat generated by the heat source, causing the internal heat exchange medium to boil into steam, and the steam with heat moves toward the condensation section of the heat dissipation tube. After the steam transfers the heat to the condensation section, the steam is re-condensed into liquid. After condensation, the liquid returns to the evaporation section through the capillary structure on the tube wall. This is repeated to achieve the heat dissipation function, thereby significantly improving the heat dissipation performance of the winding structure; and the winding structure of the present application does not require the use of resin, thereby simplifying the manufacturing process and reducing production costs.

[0010] As an optimization, in the aforementioned slotless permanent magnet motor winding structure, the heat dissipation pipe is a U-shaped double-tube structure formed by folding a rectangle. With this structure, the contact area between the heat dissipation pipe and the winding is increased, the heat dissipation efficiency is improved, and the rigidity of the structure is increased, thereby improving the reliability of the structure.

[0011] As an optimization, in the aforementioned slotless permanent magnet motor winding structure, a group of evenly distributed ventilation slots are provided on the outer surface of the fixed sleeve, and the ventilation slots are provided along the axis of the fixed sleeve and penetrate the fixed sleeve. This structure guides the flow direction of air by providing ventilation slots on the fixed sleeve, thereby further improving the heat dissipation efficiency.

[0012] As an optimization, in the aforementioned slotless permanent magnet motor winding structure, the outer surface of the stator core is provided with a thermal conductive adhesive. With this structure, a thermal conductive adhesive is provided on the contact surface between the stator core and the fixed sleeve, so that the heat of the stator core can be better transferred to the fixed sleeve, thereby improving the heat dissipation efficiency.

[0013] As an optimization, in the aforementioned slotless permanent magnet motor winding structure, the pins of the heat dissipation pipe are interference-fitted with the connection holes on the fixed sleeve. This structure can not only ensure that the heat dissipation pipe is stably fixed on the fixed sleeve, but also make the installation and removal of the heat dissipation pipe more convenient, which is conducive to maintenance and replacement.

[0014] Furthermore, in the aforementioned slotless permanent magnet motor winding structure, a heat conductive adhesive is provided on the contact surface between the pin and the connecting hole. This structural arrangement increases the heat conductivity between the heat dissipation pipe and the fixed sleeve, thereby improving the heat dissipation efficiency.

[0015] As an optimization, in the aforementioned slotless permanent magnet motor winding structure, the interior of the heat dissipation pipe is a vacuum environment. In a vacuum environment, the boiling point of the liquid is low, and the heat exchange medium can absorb a large amount of heat when it is converted from liquid to gas, thereby making the heat dissipation efficiency of the heat dissipation pipe higher; and in a vacuum state, the heat exchange medium inside the heat dissipation pipe will not undergo an electrochemical reaction with the pipe wall, which can increase the service life of the heat dissipation pipe.

[0016] For the motor, the technical solution of this application is:

[0017] A slotless permanent magnet motor comprises a rotor and a permanent magnet arranged on the outer surface of the rotor; a main shaft is provided through the center of the rotor, and the two ends of the main shaft form a rotating pair structure with a front cover and a rear cover respectively; a motor housing is connected between the front cover and the rear cover; the interior of the motor housing is fixedly connected with the aforementioned slotless permanent magnet motor winding structure, and the slotless permanent magnet motor winding structure is coaxially arranged with the rotor.

[0018] Compared with the prior art, the slotless permanent magnet motor of the present application is provided with the slotless permanent magnet motor winding structure of the present application, which can significantly improve the heat dissipation performance of the motor; and the internal winding structure does not need to be fixed with resin, thereby simplifying the manufacturing process and reducing production costs.

[0019] As an optimization, in the aforementioned slotless permanent magnet motor, a group of evenly distributed ventilation grooves are provided on the outer surface of the fixed sleeve, and the ventilation grooves are arranged along the axis of the fixed sleeve and penetrate the fixed sleeve; the outer surface of the stator core is provided with thermal conductive glue; the contact surface between the tube pin and the connecting hole is provided with thermal conductive glue. This structure guides the flow direction of air by providing ventilation grooves on the fixed sleeve; thermal conductive glue is provided on the contact surface between the stator core and the fixed sleeve, so that the heat of the stator core can be better transferred to the fixed sleeve; thermal conductive glue is provided on the contact surface between the tube pin and the connecting hole to increase the thermal conductivity between the heat pipe and the fixed sleeve, thereby further improving the heat dissipation efficiency.

[0020] As an optimization, in the aforementioned slotless permanent magnet motor, the interior of the heat dissipation pipe is a vacuum environment. In a vacuum environment, the boiling point of the liquid is low, and the heat exchange medium can absorb a large amount of heat when it is converted from liquid to gas, thereby making the heat dissipation efficiency of the heat dissipation pipe higher; and in a vacuum state, the heat exchange medium inside the heat dissipation pipe will not undergo an electrochemical reaction with the pipe wall, which can increase the service life of the heat dissipation pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the slotless permanent magnet motor of the present application;

[0022] Figure 2 yes Figure 1 Front section view;

[0023] Figure 3 It is a structural schematic diagram of the slotless permanent magnet motor winding structure of the present application;

[0024] Figure 4 yes Figure 3 Schematic diagram of some structures in ;

[0025] Figure 5 yes Figure 4 Schematic diagram of some structures in ;

[0026] Figure 6 It is a structural schematic diagram of the heat dissipation pipe of the present application.

[0027] The markings in the attached drawings are: 1-stator core; 2-fixed sleeve, 21-connecting hole, 22-ventilation slot; 3-heat dissipation pipe, 31-tube pin, 32-capillary structure, 321-evaporation section, 322-insulation section, 323-condensation section; 4-winding; 5-rotor; 6-permanent magnet; 7-front cover; 8-rear cover; 9-motor housing. DETAILED DESCRIPTION

[0028] The present application is further described below in conjunction with the accompanying drawings and embodiments, but is not intended to be limiting of the present application. In the following embodiments, the contents not described in detail or not shown in detail in the accompanying drawings are all common technical knowledge in the art.

[0029] Example (see Figure 1 to Figure 6 ):

[0030] A slotless permanent magnet motor comprises a rotor 5 and a permanent magnet 6 arranged on the outer surface of the rotor 5; a main shaft is provided through the center of the rotor 5, and the two ends of the main shaft form a rotating auxiliary structure with a front cover 7 and a rear cover 8 respectively; a motor housing 9 is connected between the front cover 7 and the rear cover 8; a slotless permanent magnet motor winding structure is fixedly connected to the inside of the motor housing 9, and the slotless permanent magnet motor winding structure is coaxially arranged with the rotor 5; the slotless permanent magnet motor winding structure comprises a stator core 1 and a fixed sleeve 2 sleeved on the outside of the stator core 1; the stator core 1 and the fixed sleeve 2 are both annular structures, and the outer surface of the stator core 1 is tightly connected to the inner surface of the fixed sleeve 2. Matching; a group of connecting holes 21 evenly distributed along the circumferential direction are respectively provided on the inner surface of the fixed sleeve 2 and on both sides of the stator core 1; a group of heat dissipation pipes 3 are inserted on the connecting holes 21, and the heat dissipation pipes 3 are U-shaped and arranged across the stator core 1; two pins 31 of the heat dissipation pipe 3 match with the connecting holes 21, and the pins 31 abut against the two side surfaces of the stator core 1, which are used to limit the stator core 1; a winding 4 is provided on the heat dissipation pipe 3; a capillary structure 32 is provided inside the heat dissipation pipe 3, which divides the inside of the heat dissipation pipe 3 into an evaporation section 321, an insulation section 322 and a condensation section 323; a heat exchange medium is provided inside the heat dissipation pipe 3.

[0031] In this embodiment, the heat dissipation pipe 3 is a U-shaped double-tube structure formed by folding a rectangle. With this structure, the contact area between the heat dissipation pipe 3 and the winding 4 is increased, the heat dissipation efficiency is improved, and the rigidity of the structure is improved, thereby improving the reliability of the structure.

[0032] In this embodiment, a group of evenly distributed ventilation grooves 22 are provided on the outer surface of the fixed sleeve 2, and the ventilation grooves 22 are provided along the axis of the fixed sleeve 2 and penetrate the fixed sleeve 2. This structure guides the flow direction of air by providing the ventilation grooves 22 on the fixed sleeve 2, thereby further improving the heat dissipation efficiency.

[0033] In this embodiment, the outer surface of the stator core 1 is provided with heat-conducting glue. With this structure, heat-conducting glue is provided on the contact surface between the stator core 1 and the fixing sleeve 2, so that the heat of the stator core 1 can be better transferred to the fixing sleeve 2, thereby improving the heat dissipation efficiency.

[0034] In this embodiment, the pin 31 of the heat dissipation tube 3 is interference fit with the connection hole 21 on the fixed sleeve 2. With this structure, the heat dissipation tube 3 can be stably fixed on the fixed sleeve 2, and the installation and removal of the heat dissipation tube 3 are more convenient, which is conducive to maintenance and replacement.

[0035] In this embodiment, a heat-conducting adhesive is provided on the contact surface between the pin 31 and the connecting hole 21. This structural arrangement increases the heat conductivity between the heat pipe 3 and the fixed sleeve 2, thereby improving the heat dissipation efficiency.

[0036] In this embodiment, the interior of the heat dissipation tube 3 is a vacuum environment. In a vacuum environment, the boiling point of the liquid is low, and the heat exchange medium can absorb a large amount of heat when it is converted from liquid to gas, thereby making the heat dissipation efficiency of the heat dissipation tube 3 higher; and in a vacuum state, the heat exchange medium inside the heat dissipation tube 3 will not undergo an electrochemical reaction with the tube wall, which can increase the service life of the heat dissipation tube 3.

[0037] When installing the slotless permanent magnet motor of this embodiment, the stator core 1 with the outer surface coated with thermal conductive glue is placed in the fixed sleeve 2 and tightly matched with the fixed sleeve 2, the heat dissipation pipe 3 with the pin 31 coated with thermal conductive glue is inserted into the connecting hole 21 in turn and tightly matched with the connecting hole 21, and the winding 4 is wound on the heat dissipation pipe 3 to form a slotless permanent magnet motor winding structure; the slotless permanent magnet motor winding structure is installed in the motor housing 9; the front end cover 7 is connected to the motor housing 9; the permanent magnet 6 is placed on the rotor 5; the main shaft of the rotor 5 is inserted into the front end cover 7, and forms a rotating auxiliary structure with the front end cover 7; the rear end cover 8 is installed at the other end of the main shaft and connected to the motor housing 9.

[0038] The above general description of the invention involved in this application and the description of its specific implementation methods should not be understood as limiting the technical solutions of the invention. Based on the disclosure of this application, those skilled in the art can, without violating the constituent elements of the invention involved, add, reduce or combine the disclosed technical features in the above general description or / and specific implementation methods (including examples) to form other technical solutions within the scope of protection of this application.

Claims

1. A slotless permanent magnet motor winding structure, comprising a stator core (1) and a fixed sleeve (2) sleeved on the outside of the stator core (1); the stator core (1) and the fixed sleeve (2) are both annular structures, and the outer surface of the stator core (1) and the inner surface of the fixed sleeve (2) are tightly matched; a group of connection holes (21) are arranged on the inner surface of the fixed sleeve (2) and on both sides of the stator core (1) and are evenly distributed in the circumferential direction; a group of heat dissipation pipes (3) are inserted into the connection holes (21), and the heat dissipation pipes (3) are in a U-shaped structure. The heat dissipation tube (3) has a capillary structure (32) disposed across the stator core (1); the two tube pins (31) of the heat dissipation tube (3) cooperate with the connection hole (21), and the tube pins (31) abut against two side surfaces of the stator core (1) to limit the position of the stator core (1); the heat dissipation tube (3) is provided with a winding (4); the heat dissipation tube (3) is provided with a capillary structure (32) inside, dividing the inside of the heat dissipation tube (3) into an evaporation section (321), an insulation section (322) and a condensation section (323); and the heat exchange medium is provided inside the heat dissipation tube (3).

2. The slotless permanent magnet motor winding structure according to claim 1, characterized in that: The heat dissipation pipe (3) is a U-shaped double-tube structure formed by folding a rectangle in half.

3. The slotless permanent magnet motor winding structure according to claim 2, characterized in that: A group of evenly distributed ventilation grooves (22) are provided on the outer surface of the fixed sleeve (2); the ventilation grooves (22) are arranged along the axis of the fixed sleeve (2) and penetrate the fixed sleeve (2).

4. The slotless permanent magnet motor winding structure according to claim 3, characterized in that: The outer surface of the stator core (1) is provided with heat-conducting glue.

5. The slotless permanent magnet motor winding structure according to claim 4, characterized in that: The tube pin (31) of the heat dissipation tube (3) is interference-fitted with the connection hole (21) on the fixing sleeve (2).

6. The slotless permanent magnet motor winding structure according to claim 5, characterized in that: A heat-conducting adhesive is provided on the contact surface between the pin (31) and the connection hole (21).

7. The slotless permanent magnet motor winding structure according to any one of claims 1 to 6, characterized in that: The interior of the heat dissipation pipe (3) is a vacuum environment.

8. A slotless permanent magnet motor, characterized in that: The invention comprises a rotor (5) and a permanent magnet (6) arranged on the outer surface of the rotor (5); a main shaft is provided through the center of the rotor (5), and two ends of the main shaft respectively form a rotating pair structure with a front cover (7) and a rear cover (8); a motor housing (9) is connected between the front cover (7) and the rear cover (8); the slotless permanent magnet motor winding structure according to claim 1 is fixedly connected to the inside of the motor housing (9), and the slotless permanent magnet motor winding structure is coaxially arranged with the rotor (5).

9. The slotless permanent magnet motor according to claim 8, characterized in that: A group of evenly distributed ventilation grooves (22) are provided on the outer surface of the fixed sleeve (2), and the ventilation grooves (22) are arranged along the axis of the fixed sleeve (2) and penetrate the fixed sleeve (2); a heat-conducting adhesive is provided on the outer surface of the stator core (1); and a heat-conducting adhesive is provided on the contact surface between the pin (31) and the connection hole (21).

10. The slotless permanent magnet motor according to claim 8 or 9, characterized in that: The interior of the heat dissipation pipe (3) is a vacuum environment.

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