Rotor ventilation slot assembly of permanent magnet motor

Abstract

The utility model relates to the technical field of permanent magnet motors, in particular to a rotor ventilation slot assembly of a permanent magnet motor, which comprises an annular slot plate. The channel steel units are uniformly distributed on the channel plate along the circumferential direction; each channel steel unit comprises an inner circumferential channel steel group and an outer circumferential channel steel group; the sections of the inner peripheral channel steel group and the outer peripheral channel steel group are groove-shaped; the inner peripheral channel steel group comprises center channel steel arranged on the center line of the channel plate and inner ring channel steel symmetrically arranged on the two sides of the center channel steel, the multiple inner ring channel steel is arranged, and the lengths of the multiple inner ring channel steel are sequentially increased in the direction away from the center channel steel; the peripheral channel steel set comprises a plurality of outer ring channel steel symmetrically arranged on the two sides of the center line of the groove plate, and the lengths of the outer ring channel steel are sequentially decreased in the direction away from the center line of the groove plate. By setting the shape of the channel steel and the mounting position of the channel steel, heat of the permanent magnet can enter the inner ring channel steel and the outer ring channel steel from the two sides to be discharged, the heat can be conveniently guided to flow in the groove-shaped channel of the channel steel, and the heat dissipation effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of permanent magnet motor, concretely is a rotor ventilation slot subassembly of permanent magnet motor. BACKGROUND

[0002] Permanent magnet motor is a kind of motor that relies on permanent magnet to generate magnetic field, has high efficiency, energy saving, small size, light weight and other advantages, main components include stator, rotor rotationally connected in the center of stator and permanent magnet arranged on rotor.According to the position and structure of permanent magnet in motor, permanent magnet motor can be divided into multiple types, such as surface-mounted permanent magnet motor and built-in permanent magnet motor are the most common two types, wherein the permanent magnet of built-in permanent magnet motor is embedded in the interior of rotor, has the advantages of small leakage coefficient, high mechanical strength of rotor lamination, easy installation of permanent magnet, but, since its permanent magnet is embedded in the interior of rotor, the path of heat dissipation is longer, heat is not easy to dissipate, leading to the temperature of the interior of rotor is easy to rise, thereby affecting the performance and life of motor, therefore, in order to improve the heat dissipation performance of built-in permanent magnet motor, ventilation structure can be arranged in the rotor, such as prior art "a rotor of self-starting permanent magnet synchronous motor" (publication number: CN110829658A), by setting ventilation slot in the rotor to ensure that motor can effectively dissipate heat during operation, but prior art still has the following technical problems:

[0003] The ventilation slot of prior art is formed by the air passage between adjacent two ventilation slot sheets, and since the ventilation slot sheet has a certain thickness, the heat of rotor rotation can only flow out from the passage between the ventilation slot sheets, the thickness of ventilation slot sheet occupies a part of the volume of passage, the width of ventilation slot passage is insufficient, leading to heat being easily blocked by ventilation slot sheet, causing heat not easy to circulate in the interior of rotor, reducing the heat dissipation effect in the interior of rotor. UTILITY MODEL CONTENTS

[0004] The utility model provides a rotor ventilation slot subassembly of permanent magnet motor, can solve the problem that the heat dissipation effect in the interior of rotor of permanent magnet motor of prior art is poor due to insufficient width of ventilation slot passage.

[0005] The application provides the following technical scheme: a rotor ventilation slot subassembly of permanent magnet motor, including annular slot plate;

[0006] Further comprising slot steel unit that is evenly distributed on the slot plate along the circumference, the slot steel unit includes inner circumferential slot steel group and outer circumferential slot steel group;The cross section of inner circumferential slot steel group and outer circumferential slot steel group is recessed groove type;

[0007] The inner circumferential slot steel group includes center slot steel arranged on the center line of slot plate and inner ring slot steel symmetrically arranged on the both sides of center slot steel, the inner ring slot steel is equipped with multiple, and the length of multiple inner ring slot steels is lengthened in turn along the direction away from center slot steel.

[0008] The outer peripheral channel steel group comprises a plurality of outer ring channel steels symmetrically arranged on both sides of the channel plate center line, and the length of the plurality of outer ring channel steels gradually decreases in the direction away from the channel plate center line.

[0009] Beneficial effects:

[0010] 1. The heat dissipation effect is improved by the shape of the channel steel. In the scheme, the inner ring channel steel and the outer ring channel steel are arranged on the inner and outer sides of the permanent magnet respectively, so that the heat of the permanent magnet can enter the inner ring channel steel and the outer ring channel steel from both sides to speed up the heat dissipation speed and effect. In addition, compared with the prior art, the cross-sectional shape of the inner ring channel steel and the outer ring channel steel in the scheme is groove-shaped, which can increase the surface area of the channel steel. At the same time, the groove can also serve as a channel for heat flow, which will not block the heat flow. It is convenient to guide the heat to flow in the groove-shaped channel of the channel steel, and the heat dissipation effect is improved.

[0011] 2. The heat dissipation effect is improved by the installation position of the channel steel. The length of the inner ring channel steel gradually increases in the direction away from the center channel steel, and the length of the outer ring channel steel gradually decreases in the direction away from the channel plate center line. It can adapt to the installation position of the permanent magnet, and make one end of all channel steels as close to the surface of the permanent magnet as possible. In this way, the heat of the permanent magnet can directly enter the groove-shaped channel in each channel steel after being dissipated, which helps the heat to be quickly discharged along the channel.

[0012] Further, V-shaped holes are also provided on the channel plate, the openings of the V-shaped holes face the edges of the channel plate, the outer peripheral channel steel group is located on the outer side circumference of the channel plate corresponding to the openings of the V-shaped holes, and the inner peripheral channel steel group is located on the inner side circumference of the channel plate corresponding to the sharp corners of the V-shaped holes.

[0013] Beneficial effects: The V-shaped holes are used to fix the permanent magnet, which can ensure that the permanent magnet does not loosen during the rotation of the rotor. The V-shaped arrangement of the permanent magnet can optimize the magnetic circuit, reduce the leakage of magnetic flux, reduce the influence of magnetic resistance torque, and improve the effective utilization of the magnetic circuit.

[0014] Further, the inner ring channel steel comprises a first channel steel, a second channel steel, a third channel steel and a fourth channel steel fixed on the channel plate in the direction away from the center channel steel, the interval angle between the center channel steel, the first channel steel, the second channel steel and the third channel steel is 7°±1°, and the interval angle between the second channel steel and the third channel steel is 6°±1°.

[0015] Beneficial effects: By uniformly arranging the interval angle of the inner ring channel steel, the heat of the permanent magnet can flow from the groove channels of each inner ring channel steel on the inner periphery of the channel plate to the center of the rotor core, and be dissipated and discharged from the center, thereby improving the heat dissipation efficiency.

[0016] Further, the outer ring channel steel comprises a fifth channel steel, a sixth channel steel and a seventh channel steel fixed on the channel plate in sequence in the direction away from the center line of the channel plate, the interval angle between the fifth channel steel and the sixth channel steel is 5°±1°, and the interval angle between the sixth channel steel and the seventh channel steel is 6°±1°.

[0017] Beneficial effects: the interval angle of the outer ring channel steel is uniformly arranged, so that the heat on the outer side of the permanent magnet can flow and dissipate through the groove channel of each outer ring channel steel on the outer periphery of the channel plate, and the heat dissipation efficiency is improved.

[0018] Further, the opening included angle of the V-shaped hole is 150°±20′.

[0019] Beneficial effects: the V-shaped hole is used for fixing the permanent magnet, so that the permanent magnet is arranged at a certain angle, the magnetic flux distribution between the permanent magnets is optimized, the mutual interference of the magnetic flux is reduced, the magnetic flux is more concentrated in the stator winding, and the magnetic flux is not easy to leak, so that the output power and the efficiency of the motor are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front view of the utility model.

[0021] Figure 2 It is an enlarged view in Figure 1 . DETAILED DESCRIPTION

[0022] The following will be further described in detail through specific embodiments:

[0023] The marks in the drawings of the specification include: channel plate 1, V-shaped hole 2, center channel steel 3, first channel steel 4, second channel steel 5, third channel steel 6, fourth channel steel 7, fifth channel steel 8, sixth channel steel 9 and seventh channel steel 10.

[0024] Example one

[0025] As shown in Figures 1 to 2 , a rotor ventilation slot assembly of a permanent magnet motor comprises an annular channel plate 1, a channel steel unit uniformly distributed on the channel plate 1 in the circumferential direction and a V-shaped hole 2 formed on the channel plate 1, and the channel steel unit is surrounded on the outer periphery of the V-shaped hole 2.

[0026] The channel steel unit is provided with a plurality of channel steel units, including an inner circumferential channel steel group and an outer circumferential channel steel group; the inner circumferential channel steel group is arranged on the inner circumference of the channel plate 1 and located on the inner side of the V-shaped hole 2, and the outer circumferential channel steel group is arranged on the outer circumference of the channel plate 1 and located on the outer side of the V-shaped hole 2.

[0027] The inner circumferential channel steel group comprises a center channel steel 3 arranged on the center line of the channel plate 1 and inner ring channel steels arranged symmetrically on both sides of the center channel steel 3, the inner ring channel steels comprise a first channel steel 4, a second channel steel 5, a third channel steel 6 and a fourth channel steel 7 fixed on the channel plate 1 in turn in a direction away from the center channel steel 3, and the lengths of the first channel steel 4, the second channel steel 5, the third channel steel 6 and the fourth channel steel 7 are lengthened in turn in the direction away from the center channel steel 3. The interval angle between the center channel steel 3, the first channel steel 4, the second channel steel 5 and the third channel steel 6 ranges from 7°±1°, and the interval angle between the second channel steel 5 and the third channel steel 6 is preferably 6° in the embodiment.

[0028] The outer circumferential channel steel group comprises a plurality of outer ring channel steels arranged symmetrically on both sides of the center line of the channel plate 1, the outer ring channel steels comprise a fifth channel steel 8, a sixth channel steel 9 and a seventh channel steel 10 fixed on the channel plate 1 in turn in a direction away from the center line of the channel plate 1, and the lengths of the fifth channel steel 8, the sixth channel steel 9 and the seventh channel steel 10 are shortened in turn in the direction away from the center line of the channel plate 1. The interval angle between the fifth channel steel 8 and the sixth channel steel 9 is 5°±1°, and the interval angle between the sixth channel steel 9 and the seventh channel steel 10 is preferably 6° in the embodiment. The cross section of each inner ring channel steel and each outer ring channel steel is a groove type.

[0029] The V-shaped holes 2 are arranged in a plurality of groups and are uniformly distributed in a ring shape on the channel plate 1, and the openings of the V-shaped holes 2 are directed outward from the edges of the channel plate 1, and the opening angle of the V-shaped holes 2 is 150°±20′, and the opening angle of the V-shaped holes 2 is preferably 150° in the embodiment. The outer circumferential channel steel group is located on the outer circumferential side of the channel plate 1 corresponding to the opening of the V-shaped hole 2, and the inner circumferential channel steel group is located on the inner circumferential side of the channel plate 1 corresponding to the sharp corner of the V-shaped hole 2. The V-shaped holes 2 are used for fixing permanent magnets, which can ensure that the permanent magnets do not loosen during rotation of the rotor, so that the permanent magnets are arranged at a certain angle, which can optimize the magnetic flux distribution between the permanent magnets, reduce the mutual interference of the magnetic flux, and the magnetic flux is more concentrated in the stator winding, which is not easy to leak, thereby improving the output power and efficiency of the motor.

[0030] The use principle is as follows:

[0031] The structure is installed between the punching sheets in the permanent magnet motor, and a slot plate 1 is installed every certain number of punching sheets. Since the inner ring channel steel and the outer ring channel steel are arranged on the inner and outer sides of the permanent magnet, when the rotor rotates, the heat of the permanent magnet can enter the inner ring channel steel and the outer ring channel steel from the two sides, so that the heat dissipation speed and effect are accelerated. Meanwhile, the cross-sectional shape of the inner ring channel steel and the outer ring channel steel is groove-shaped, which can increase the surface area of the channel steel. The groove can also serve as a heat flow channel, so that the heat flow is not blocked and can flow from the groove-shaped channel of the channel steel, thereby improving the heat dissipation effect. The length of the inner ring channel steel is gradually increased in the direction away from the center channel steel 3, and the length of the outer ring channel steel is gradually decreased in the direction away from the center line of the slot plate 1, so that the installation position of the permanent magnet can be adapted, and one end of all the channel steels is as close to the surface of the permanent magnet as possible. In this way, after the heat of the permanent magnet is dissipated, it can directly enter the groove-shaped channel in each channel steel, thereby helping the heat to be quickly discharged along the channel.

[0032] Embodiment two

[0033] The difference between the present embodiment and embodiment one is that a steel bar arranged along the length direction of the groove is arranged in each channel steel in the channel steel unit, the steel bar divides the through groove of the channel steel into multiple small grooves, so that the heat guiding effect is strengthened, and the groove wall area in each channel steel is increased, thereby increasing the heat dissipation effect.

[0034] Embodiment three

[0035] The difference between the present embodiment and embodiment two is that multiple heat dissipation fins arranged in an inclined manner are further fixed on the wall surface of the steel bar. The multiple heat dissipation fins are arranged in a uniform inclined angle, and the inclined direction of the multiple heat dissipation fins is away from the V-shaped hole. The heat dissipation fins arranged in an inclined manner not only further increase the heat dissipation area, but also facilitate the heat convection in the inclined direction, and prevent the heat from flowing back, so that the heat of the channel steel can be discharged to the through hole in the middle of the rotor or the air gap outside the rotor circumference, thereby accelerating the heat dissipation.

[0036] The above is only an embodiment of the present application, and the present application is not limited to the field involved in the embodiment. The specific structures and properties known in the art are not described in detail. It should be noted that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application. The protection scope of the present application should be subject to the content of the claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A rotor ventilation slot assembly for a permanent magnet motor, comprising an annular slot plate, characterized in that: It also includes channel steel units evenly distributed circumferentially on the channel plate, wherein the channel steel unit includes an inner circumferential channel steel group and an outer circumferential channel steel group; the cross-section of the inner circumferential channel steel group and the outer circumferential channel steel group is U-shaped. The inner circumferential channel steel assembly includes a central channel steel set on the center line of the channel plate and inner ring channel steels symmetrically set on both sides of the central channel steel. There are multiple inner ring channel steels, and the length of the multiple inner ring channel steels increases sequentially in the direction away from the central channel steel. The outer peripheral channel steel group includes multiple outer ring channel steels symmetrically arranged on both sides of the center line of the channel plate, and the length of the multiple outer ring channel steels decreases sequentially in the direction away from the center line of the channel plate.

2. The rotor ventilation slot assembly of a permanent magnet motor according to claim 1, characterized in that: The channel plate is also provided with V-shaped holes, the openings of the V-shaped holes facing the edge of the channel plate, the outer peripheral channel steel group is located on the outer circumference of the channel plate corresponding to the opening of the V-shaped hole, and the inner peripheral channel steel group is located on the inner circumference of the channel plate corresponding to the sharp corner of the V-shaped hole.

3. The rotor ventilation slot assembly of a permanent magnet motor according to claim 2, characterized in that: The inner ring channel steel includes a first channel steel, a second channel steel, a third channel steel, and a fourth channel steel, which are fixed sequentially on the channel plate in the direction away from the central channel steel. The interval angle between the central channel steel, the first channel steel, the second channel steel, and the third channel steel is 7°±1°, and the interval angle between the second channel steel and the third channel steel is 6°±1°.

4. The rotor ventilation slot assembly of a permanent magnet motor according to claim 3, characterized in that: The outer ring channel steel includes a fifth channel steel, a sixth channel steel, and a seventh channel steel that are fixed sequentially on the channel plate in a direction away from the center line of the channel plate. The interval angle between the fifth channel steel and the sixth channel steel is 5°±1°, and the interval angle between the sixth channel steel and the seventh channel steel is 6°±1°.

5. The rotor ventilation slot assembly of a permanent magnet motor according to claim 4, characterized in that: The included angle of the opening of the V-shaped hole is 150°±20′.

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