Winding type concave permanent magnet motor iron core structure

Abstract

The utility model discloses a winding type concave permanent magnet motor iron core structure, which comprises a rotor iron core, a main shaft hole and permanent magnet grooves, the permanent magnet grooves are arranged around the main shaft hole, magnetic isolation bridges are arranged between two ends of each permanent magnet groove and the outer wall of the rotor iron core, each magnetic isolation bridge comprises a first magnetic isolation part and a second magnetic isolation part, and the first magnetic isolation parts and the second magnetic isolation parts are arranged on the outer wall of the rotor iron core. A first magnetic isolation part is arranged on the stator core, a second magnetic isolation part is arranged on one side of the first magnetic isolation part, a heat dissipation part is arranged outside the stator core, the heat dissipation part comprises an oil passing hole and a heat dissipation groove, and the stator core is formed by stacking a plurality of groups of stator silicon steel punching sheets and heat dissipation copper sheets. The heat dissipation copper sheets and the heat dissipation parts are adopted to improve the heat dissipation effect of the stator iron core, the situation that the service life of the motor is shortened due to loss caused by overheating of the motor in the operation process is avoided, and the thicknesses of the first magnetic isolation parts and the second magnetic isolation parts are different, so that magnetic conductance of magnetic circuits of magnetic poles of the rotor in the circumferential direction and the radial direction is more uniform. And the magnetic resistance distribution of each magnetic circuit of the motor is changed, thereby reducing the cogging effect of the motor.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a winding type concave permanent magnet motor core structure. Background Art

[0002] Permanent magnet motors use permanent magnet excitation instead of coil excitation, which not only saves a lot of copper and iron materials for making the motor, making the whole machine smaller and lighter, but also saves the electric energy consumed when the excitation coil is working, which is beneficial to improving the electromechanical conversion efficiency of the motor. The application number CN201210411621.X is retrieved, which is a motor core. The core teeth are assembled together to form a circular core group, and the two sides are fixed with V-shaped rings. The direction of the maximum magnetic permeability of the core is consistent with the magnetic lines of force. It has the advantages of maximum magnetic permeability, small size, short magnetic circuit, small leakage magnetic field, small internal resistance, material saving, and high output power. It is suitable for generators and motors.

[0003] Similar to the above-mentioned motor core: although the core teeth are assembled together to form a circular core group, the direction of the maximum magnetic permeability of the core is consistent with the magnetic lines of force, which makes the magnetic permeability large, but firstly, losses will be generated during the operation of the motor. These losses will serve as a heat source to heat the motor components and increase the temperature of the motor. It does not have an auxiliary heat dissipation function, which may easily cause the motor temperature to be too high, thereby causing damage or reducing the service life of the motor. Secondly, the motor with an iron core will be affected by the cogging effect during operation, and no magnetic isolation device is provided to reduce the cogging effect of the motor.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a winding type recessed permanent magnet motor core structure is proposed to achieve a more practical purpose. Utility Model Content

[0005] The purpose of the utility model is to provide a wound inward-recessed permanent magnet motor core structure to solve the problem that the above-mentioned motor core proposed in the above-mentioned background technology firstly generates losses during the operation of the motor, and these losses will serve as a heat source to heat the motor components, causing the motor temperature to rise, and it does not have an auxiliary heat dissipation function, which can easily cause the motor temperature to be too high, thereby causing damage or reducing the service life of the motor; secondly, the motor with an iron core will be affected by the cogging effect during operation, and it does not have a magnetic isolation device to reduce the cogging effect of the motor.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wound inward-recessed permanent magnet motor core structure, comprising a rotor core, a spindle hole and permanent magnet slots, wherein a spindle hole is arranged at the center of the rotor core, the center of the spindle hole is on the same straight line as the center of the rotor core, and the permanent magnet slots are arranged around the spindle hole.

[0007] Furthermore, an assembly hole is provided on one side of the permanent magnet slot, and a magnetic isolation bridge is provided between the two ends of the permanent magnet slot and the outer wall of the rotor core. The magnetic isolation bridge includes a first magnetic isolation part and a second magnetic isolation part, and the second magnetic isolation part is provided on one side of the first magnetic isolation part.

[0008] Furthermore, the first magnetic isolation portion and the second magnetic isolation portion are arranged along the width direction of the permanent magnet slot, and the width of the first magnetic isolation portion is smaller than that of the second magnetic isolation portion.

[0009] Furthermore, arc grooves are arranged on the outer wall of the rotor core, a stator core is sleeved on the outside of the rotor core, and the center of the stator core and the center of the rotor core are on the same straight line.

[0010] Furthermore, the inner wall of the stator core is arranged with stator teeth, stator tooth slots are arranged between the stator teeth, the outer wall of the stator core is arranged with positioning grooves, one side of the positioning groove is provided with a welding groove, and the outside of the stator core is arranged with a heat dissipation part, the heat dissipation part includes an oil hole and a heat dissipation groove, and the oil hole and the heat dissipation groove are arranged at the four ends of the stator core.

[0011] Furthermore, the outer wall of the stator core is coated with an insulating paint layer, the rotor core is formed by stacking rotor punchings, and the stator core is formed by stacking multiple groups of stator silicon steel punchings and heat dissipation copper sheets.

[0012] Compared with the prior art, the utility model has the following beneficial effects: a winding type concave permanent magnet motor core structure, using heat dissipation copper sheets and heat dissipation parts to improve the heat dissipation effect of the stator core, avoiding overheating of the motor during operation and causing loss, thereby reducing the service life of the motor, using different thicknesses of the first magnetic isolation part and the second magnetic isolation part to make the magnetic permeance of the rotor magnetic poles in various magnetic circuits in the circumferential and radial directions more uniform, changing the magnetic resistance distribution at various locations of the motor magnetic circuit, thereby reducing the cogging effect of the motor, the specific contents are as follows:

[0013] The stator core is arranged with a heat dissipation part on the outside, which improves the heat dissipation effect of the stator core and avoids overheating of the motor during operation, resulting in loss and thus reducing the service life of the motor. The heat dissipation part includes oil holes and heat dissipation grooves, which are arranged at the four ends of the stator core. The oil holes facilitate the flow of cooling medium to achieve the heat dissipation effect. The heat dissipation groove can cooperate with the cooling fan in the motor to pass the cooling air to dissipate the heat and cool the stator core. The stator core is formed by stacking multiple groups of stator silicon steel punchings and heat dissipation copper sheets. The heat dissipation copper sheets are arranged in multiple groups of stator silicon steel punchings to improve the heat dissipation effect of the stator core, which is convenient for heat to be exported to the outside for heat dissipation. A magnetic isolation bridge is arranged between the two ends of the permanent magnet slot and the outer wall of the rotor core. The principle of the magnetic isolation bridge is to limit the leakage magnetic flux by saturating the magnetic flux at the magnetic bridge. The magnetic isolation bridge includes a first magnetic isolation part and a second magnetic isolation part. The second magnetic isolation part is arranged on one side of the first magnetic isolation part. The first magnetic isolation part and the second magnetic isolation part both serve as the main body for isolating and limiting the leakage magnetic flux. The first magnetic isolation part and the second magnetic isolation part are arranged along the width direction of the permanent magnet slot, and the width of the first magnetic isolation part is smaller than that of the second magnetic isolation part. The different thicknesses of the first magnetic isolation part and the second magnetic isolation part make the magnetic permeability of the magnetic circuits of the rotor poles in the circumferential and radial directions more uniform, changing the magnetic resistance distribution at various parts of the motor magnetic circuit, thereby reducing the cogging effect of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main structure of a winding type concave permanent magnet motor core structure of the utility model;

[0015] Figure 2 This is a schematic diagram of a rotor core structure of a winding type concave permanent magnet motor core structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the stator core structure of a winding type concave permanent magnet motor core structure of the utility model;

[0017] Figure 4 for Figure 3 A schematic diagram of the enlarged structure of the stator tooth slot;

[0018] Figure 5 The utility model is a schematic diagram of the stator silicon steel punching structure of a winding type concave permanent magnet motor core structure.

[0019] In the figure: 1. rotor core; 2. permanent magnet slot; 3. spindle hole; 4. assembly hole; 5. magnetic isolation bridge; 51. first magnetic isolation part; 52. second magnetic isolation part; 6. stator core; 7. stator teeth; 8. stator tooth slots; 9. positioning slots; 10. welding slots; 11. heat dissipation part; 12. oil hole; 13. heat dissipation slot; 14. insulating paint layer; 15. stator silicon steel punching sheet; 16. heat dissipation copper sheet; 17. arc slot. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 - Figure 5 The utility model provides a technical solution: a winding type concave permanent magnet motor core structure, comprising a rotor core 1, a spindle hole 2 and a permanent magnet slot 3. The rotor core 1 is provided with a spindle hole 2 at the center thereof, the spindle hole 2 is used to connect the motor spindle, the center of the spindle hole 2 is on the same straight line as the center of the rotor core 1, the permanent magnet slots 3 are arranged around the spindle hole 2, the permanent magnet slots 3 are concave, and can optimize the electromagnetic field distribution of the motor, reduce eddy current loss, and thus improve the overall efficiency of the motor, and permanent magnets can be arranged in the permanent magnet slots 3 to drive the motor.

[0022] An assembly hole 4 is provided on one side of the permanent magnet slot 3, and the assembly hole 4 is convenient for inserting the positioning shaft to facilitate stacking of the rotor punching sheets. A magnetic isolation bridge 5 is provided between the two ends of the permanent magnet slot 3 and the outer wall of the rotor core 1. The principle of the magnetic isolation bridge 5 is to limit the leakage magnetic flux by saturating the magnetic flux at the magnetic bridge position. The magnetic isolation bridge 5 includes a first magnetic isolation part 51 and a second magnetic isolation part 52. The second magnetic isolation part 52 is provided on one side of the first magnetic isolation part 51. The first magnetic isolation part 51 and the second magnetic isolation part 52 both serve as the main body of magnetic isolation and limiting leakage magnetic flux.

[0023] The first magnetic isolation portion 51 and the second magnetic isolation portion 52 are arranged along the width direction of the permanent magnet slot 3, and the width of the first magnetic isolation portion 51 is smaller than that of the second magnetic isolation portion 52. The different thicknesses of the first magnetic isolation portion 51 and the second magnetic isolation portion 52 make the magnetic permeability of the rotor poles in various locations in the circumferential and radial directions more uniform, thereby changing the magnetic resistance distribution at various locations in the motor magnetic circuit, thereby reducing the cogging effect of the motor.

[0024] The outer wall of the rotor core 1 is arranged with arc grooves 17, which can reduce the weight of the rotor punchings after stacking and facilitate air to enter, thereby increasing the heat dissipation effect. The stator core 6 is sleeved on the outside of the rotor core 1. The diameter of the stator core 6 is larger than that of the rotor core 1, and the center of the stator core 6 is on the same straight line as the center of the rotor core 1.

[0025] The inner wall of the stator core 6 is arranged with stator teeth 7, which are responsible for interacting with the magnetic field on the rotor to produce electromagnetic induction effect, thereby realizing the conversion of electrical energy into mechanical energy. Stator tooth slots 8 are arranged between the stator teeth 7, and the tooth slots 8 are convenient for winding copper coils. The outer wall of the stator core 6 is arranged with positioning grooves 9, which are convenient for positioning the stator silicon steel punching sheet 15 and the heat dissipation copper sheet 16. A welding groove 10 is provided on one side of the positioning groove 9, and the welding groove 10 is convenient for welding and assembly. The outside of the stator core 6 is arranged with a heat dissipation part 11, which is used to improve the heat dissipation effect of the stator core 6 through the heat dissipation part 11 to avoid overheating and loss of the motor during operation, thereby reducing the service life of the motor. The heat dissipation part 11 includes an oil hole 12 and a heat dissipation groove 13, which are arranged at the four ends of the stator core 6. The oil hole 12 is convenient for the cooling medium to flow through to achieve the heat dissipation effect, and the heat dissipation groove 13 can cooperate with the heat dissipation fan in the motor to pass the cooling air to dissipate the heat and cool the stator core 6.

[0026] The outer wall of the stator core 6 is coated with an insulating paint layer 14, which plays an insulating role. The rotor core 1 is formed by stacking rotor punchings, and the stator core 6 is formed by stacking multiple groups of stator silicon steel punchings 15 and heat dissipation copper sheets 16. The heat dissipation copper sheets 16 are arranged in the multiple groups of stator silicon steel punchings 15 to improve the heat dissipation effect of the stator core 6, making it easier to export heat to the outside for heat dissipation.

[0027] Working principle: When using a winding type concave permanent magnet motor core structure, the main shaft hole 2 is connected to the motor main shaft, and the permanent magnet slots 3 are arranged around the main shaft hole 2. Permanent magnets can be set in the permanent magnet slots 3 to drive the motor. The assembly hole 4 is convenient for inserting the positioning shaft to facilitate the stacking of the rotor punchings. The width of the first magnetic isolation part 51 is smaller than that of the second magnetic isolation part 52. The different thicknesses make the magnetic permeability of the rotor poles in various parts of the magnetic circuit in the circumferential and radial directions more uniform, changing the magnetic resistance distribution at various parts of the motor magnetic circuit, thereby reducing the tooth slot effect of the motor. The arc groove 17 can reduce the weight of the rotor punchings after stacking and facilitate air to enter, thereby increasing the heat dissipation effect. The stator teeth 7 are responsible for interacting with the magnetic field on the rotor to produce an electromagnetic induction effect, thereby To realize the conversion of electric energy into mechanical energy, stator tooth slots 8 are arranged between the stator teeth 7. The tooth slots 8 are convenient for winding copper coils. The heat dissipation effect of the stator core 6 is improved through the heat dissipation part 11 to avoid overheating of the motor during operation, resulting in loss and thus reducing the service life of the motor. The heat dissipation part 11 includes an oil hole 12 and a heat dissipation groove 13. The oil hole 12 and the heat dissipation groove 13 are arranged at the four sides of the stator core 6. The oil hole 12 facilitates the circulation of the cooling medium to achieve the heat dissipation effect. The heat dissipation groove 13 can cooperate with the heat dissipation fan in the motor to pass the cooling air to dissipate the stator core 6. The heat dissipation copper sheet 16 is arranged in multiple groups of stator silicon steel punchings 15 to improve the heat dissipation effect of the stator core 6 and facilitate the heat dissipation.

Claims

1. A wound concave permanent magnet motor core structure, comprising a rotor core (1), a main shaft hole (2) and a permanent magnet slot (3), characterized in that: A main shaft hole (2) is arranged at the center of the rotor core (1), the center of the main shaft hole (2) and the center of the rotor core (1) are located on the same straight line, and the permanent magnet slots (3) are arranged around the main shaft hole (2).

2. A wound type concave permanent magnet motor core structure according to claim 1, characterized in that: An assembly hole (4) is provided on one side of the permanent magnet slot (3), a magnetic isolation bridge (5) is provided between the two ends of the permanent magnet slot (3) and the outer wall of the rotor core (1), the magnetic isolation bridge (5) comprises a first magnetic isolation portion (51) and a second magnetic isolation portion (52), and the second magnetic isolation portion (52) is provided on one side of the first magnetic isolation portion (51).

3. A wound type concave permanent magnet motor core structure according to claim 2, characterized in that: The first magnetic isolation portion (51) and the second magnetic isolation portion (52) are arranged along the width direction of the permanent magnet slot (3), and the width of the first magnetic isolation portion (51) is smaller than that of the second magnetic isolation portion (52).

4. The wound inner concave permanent magnet motor core structure according to claim 1, characterized in that: The outer wall of the rotor core (1) is arranged with arc grooves (17), the outer part of the rotor core (1) is sleeved with a stator core (6), and the center of the stator core (6) is on the same straight line as the center of the rotor core (1).

5. The wound inner concave permanent magnet motor core structure according to claim 4, characterized in that: The inner wall of the stator core (6) is provided with stator teeth (7), and stator tooth slots (8) are arranged between the stator teeth (7). The outer wall of the stator core (6) is provided with positioning grooves (9), and a welding groove (10) is arranged on one side of the positioning groove (9). A heat dissipation portion (11) is arranged outside the stator core (6), and the heat dissipation portion (11) includes an oil hole (12) and a heat dissipation groove (13). The oil hole (12) and the heat dissipation groove (13) are arranged at the four sides of the stator core (6).

6. The wound inner concave permanent magnet motor core structure according to claim 4, characterized in that: The outer wall of the stator core (6) is coated with an insulating paint layer (14), the rotor core (1) is formed by stacking rotor punchings, and the stator core (6) is formed by stacking multiple groups of stator silicon steel punchings (15) and heat dissipation copper sheets (16).

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