Rotor structure of surface-mounted permanent magnet motor

Abstract

The utility model relates to the technical field of permanent magnet motors, in particular to a rotor structure of a surface-mounted permanent magnet motor, which comprises a main shaft and a rotor core fixed on the main shaft. A punching sheet is arranged on the periphery of the rotor core, a plurality of grooves are annularly and uniformly distributed in the edge of the punching sheet, and a plurality of magnetic steel blocks are filled in the grooves; the bottom and the two sides of the magnetic steel block are fixed to the bottom and the two side walls of the groove through a high-temperature-resistant high-strength adhesive. A plurality of layers of carbon fiber materials are fixed on the periphery of the magnetic steel block; an annular plate is fixed on the end face of the rotor core, and L-shaped blades are fixed on the annular plate. According to the scheme, the magnetic circuit of the permanent magnet motor is more uniform, the rotor is more stable during rotation, vibration and noise are smaller, balance is better, the heat dissipation capability is improved, and the performance of the motor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of permanent magnet motor, concretely to a rotor structure of surface mount permanent magnet motor. BACKGROUND

[0002] Permanent magnet synchronous motor is a kind of motor using permanent magnet to generate magnetic field, with high efficiency, energy saving, small size, light weight and other advantages, and is widely used in various industrial fields.

[0003] According to the installation form of permanent magnet, there are three kinds of surface mounting type, insertion type and internal embedding type, wherein the surface mounting type permanent magnet motor is also called face-mounted permanent magnet motor, the permanent magnet of which is attached to the surface of rotor core, and it is convenient to manufacture, simple in structure and suitable for use in high-speed environment.For example, the prior art "high-power high-speed permanent magnet generator rotor surface mounting permanent magnet structure and method"(publication number: CN102931784A) sets multiple permanent magnets on the outer surface of rotor core, and fixes the permanent magnet and rotor core by screw and high-strength adhesive, so as to realize the fixation of permanent magnet.However, the prior art still has the following technical problems:

[0004] The permanent magnet of the prior art is fixed on the surface of rotor core by screw, and for large motor, the number of permanent magnets is several hundred or even thousands, and a screw is needed for fixing each permanent magnet, which not only consumes a lot of time in assembly, but also increases production cost;In addition, since there is a certain manufacturing error in the shape structure of screw, and there is also an installation error when locking the permanent magnet to the outer surface of rotor, it is easy to cause vibration of rotor during rotation, which affects the dynamic balance and dynamic balance adjustment of rotor;Moreover, the screw also affects the magnetic circuit distribution of permanent magnet, resulting in uneven magnetic circuit distribution and affecting the performance of motor;Finally, the installation worker for installing screw may hinder air circulation, which affects the heat dissipation effect of permanent magnet during high-speed rotation of rotor. UTILITY MODEL CONTENTS

[0005] The utility model provides a rotor structure of surface mount permanent magnet motor, which can solve the problem of uneven magnetic circuit distribution of permanent magnet and affect the heat dissipation effect of rotor in the prior art.

[0006] The application provides the following technical scheme: a rotor structure of surface mount permanent magnet motor, comprising a main shaft and a rotor core fixed on the main shaft.

[0007] A punching sheet is arranged on the outer periphery of the rotor core, the edge of the punching sheet is annularly and uniformly provided with a plurality of grooves, and a plurality of magnetic steel blocks are filled in the grooves;The bottom and both sides of the magnetic steel block are fixed to the bottom and both side walls of the groove by high-temperature-resistant high-strength adhesive.

[0008] The outer periphery of the magnetic steel block is further fixed with a plurality of layers of carbon fiber material.

[0009] An end surface of the rotor core is fixed with a ring plate, and the ring plate is fixed with L-shaped vanes.

[0010] Advantages:

[0011] 1. The magnetic circuit is uniform and has excellent performance. In the present application, the magnetic steel block is fixed on the punching sheet by a high-strength adhesive resistant to high temperature. Compared with the prior art of fixing the magnetic steel block by screws, the process is simpler and the cost is lower. Moreover, the magnetic circuit is more uniform, the rotation of the rotor is more stable, the vibration and noise are smaller, the balance is better, and the magnetic steel is not damaged due to the centrifugal force during high-speed rotation of the rotor, thereby prolonging the service life of the motor. Meanwhile, the carbon fiber material wrapped around the outer periphery of the magnetic steel block can effectively reduce the eddy current loss on the surface of the magnetic steel. The eddy current loss is caused by the current in the conductor due to the alternating magnetic field, which leads to energy loss and heating. The carbon fiber layer can prevent the formation of eddy current and improve the efficiency of the motor.

[0012] 2. Good heat dissipation performance. In the present application, vanes are fixed on the end of the rotor core. The heat generated during rotation of the rotor can be conducted away through the vanes, and the air flow in the middle of the rotor core can be accelerated during rotation of the vanes, thereby facilitating heat dissipation and improving the heat dissipation capacity. Meanwhile, the L-shaped structure of the vanes facilitates the setting of threaded holes on the vanes and the use of screws for fixation, which facilitates disassembly, replacement and maintenance.

[0013] Further, the number of fixed layers of the carbon fiber material is three, and the total thickness is not more than 0.8 mm.

[0014] Advantages: The three layers of carbon fiber material can significantly improve the mechanical strength of the magnetic steel, prevent deformation or rupture under high-speed rotation or high load conditions, and have good impact resistance to absorb and disperse external impact force and protect the magnetic steel block from damage. The total thickness of the carbon fiber material is not more than 0.8 mm, which makes the overall weight of the motor lighter, and is particularly suitable for applications with strict requirements on weight.

[0015] Further, the two ends of the punching sheet are further provided with end plates, and the end plates are tightened to the punching sheet by screws and nuts.

[0016] Advantages: The end plates are fixed at the two ends of the punching sheet by screws and nuts, so that the punching sheets are tightly stacked together. On the one hand, it can ensure the alignment of the punching sheets, improve the uniformity of the magnetic circuit, reduce the magnetic resistance torque, and at the same time, it can ensure that the punching sheets do not loosen and improve the service life.

[0017] Further, the diameter of one of the end plates is greater than the outer diameter of the punching sheet, the diameter of the other end plate is less than the outer diameter of the punching sheet, and the outer diameter is less than the outer diameter of the punching sheet.

[0018] Beneficial effects: the end plate with a diameter greater than the punching sheet can provide end face support for the magnetic steel block to prevent the magnetic steel block from falling off the end, the end plate with a diameter less than the punching sheet provides a pressing effect on the punching sheet, and the cover plate symmetrically provides end face support for the magnetic steel block from the other end to prevent the magnetic steel block from falling off, and when the magnetic steel block needs to be disassembled, the cover plate can be removed to disassemble the magnetic steel block from the end without disassembling the end plate, thereby improving the convenience of maintenance.

[0019] Further, the outer diameter of the end plate less than the punching sheet is further fixed with an arc-shaped key.

[0020] Beneficial effects: the arc-shaped key is used to fix the end plate to prevent the end plate from loosening in the axial direction and improve the stability of the rotor during operation. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a front view of the utility model.

[0022] Figure 2 It is a left view of the utility model. Figure 1

[0023] Figure 3 It is an enlarged view of the magnetic steel block and the punching sheet. Figure 2 DETAILED DESCRIPTION The following will be further described in detail through specific embodiments:

[0024] The markers in the drawings of the specification include: main shaft 1, blade 2, screw 3, ring plate 4, screw rod 5, nut 6, end plate 7, rotor core 8, punching sheet 9, protrusion 91, magnetic steel block 10, carbon fiber material 11, cover plate 12, and arc-shaped key 13.

[0026] Example 1

[0027] As shown in the value Figure 1 As shown in the value Figure 3 A rotor structure of a surface-mounted permanent magnet motor, comprising a main shaft 1, a rotor core 8 fixed on the main shaft 1, a punching sheet 9 fixed on the outer periphery of the rotor core 8, a magnetic steel block 10 fixed on the outer periphery of the punching sheet 9, a carbon fiber material 11 fixed on the outer periphery of the magnetic steel block 10, and a blade 2 fixed on the end of the rotor core 8.

[0028] As shown in the value Figure 1 As shown in the value Both end faces of the rotor core 8 are fixed with a ring plate 4, the ring plate 4 is a circular ring type, the blade 2 is fixed on the ring plate 4, and the blade 2 is L-shaped, so that the screw 3 can lock the blade 2 and the ring plate 4 on the end face of the rotor core 8.​

[0029] As Figure 1 and Figure 2 shown, the left end of the rotor core 8 is sleeved with an end plate 7, and the rotor core 8 is provided with a step, so that the left end face of the end plate 7 abuts on the step to form a limit. The right end of the rotor core 8 is also sleeved with an end plate 7, and a plurality of punching sheets 9 are clamped between the two end plates 7. The end plate 7 and the punching sheet 9 are provided with a screw rod 5 in the axial direction, and the two ends of the screw rod 5 are locked by nuts 6, so that the punching sheet 9 and the two end plates 7 are pulled tight. Figure 2 and Figure 3 As shown, the edges of the punching sheet 9 are annularly and uniformly provided with a plurality of grooves, and the adjacent grooves form protrusions 91. The magnetic steel blocks 10 are filled in the grooves. When filled, the bottom and the two sides of the magnetic steel block 10 are embedded in the groove after being coated with high-temperature-resistant high-strength adhesive, so that the magnetic steel block 10 is adhesively fixed with the bottom and the two side walls of the groove. In the embodiment, the high-temperature-resistant high-strength adhesive is selected as Thomas high-temperature glue TH0. Figure 1 In the left end plate 7, the outer circle diameter of the end plate 7 is greater than the outer circle diameter of the punching sheet 9, so that the end plate 7 at this position can form an end face support for the magnetic steel block 10, preventing the magnetic steel block 10 from falling off from the end. Figure 1 In the right end plate 7, the outer circle diameter of the end plate 7 is smaller than the outer circle diameter of the punching sheet 9, and the right side of the end plate 7 is further fixed with a cover plate 12 by a screw 3. The cover plate 12 forms an end face support for the magnetic steel block 10 from the right end, preventing the magnetic steel block 10 from falling off. At the same time, when the magnetic steel block 10 needs to be disassembled, the cover plate 12 can be removed to disassemble the magnetic steel block 10 from the end without disassembling the end plate 7, thereby improving the convenience of maintenance.

[0030] In Figure 1 the right end plate 7, the right side of the end plate 7 is further fixed with an arc-shaped key 13. An arc-shaped groove is provided on the outer circle of the rotor core 8. After the arc-shaped key 13 is embedded in the arc-shaped groove, welding is used for reinforcement, so that the arc-shaped key 13 can fix the end plate 7 from the axial direction, preventing the end plate 7 from loosening in the axial direction and improving the stability during rotation of the rotor.

[0031] The carbon fiber material 11 provided on the outer periphery of the magnetic steel block 10 can be provided with multiple layers. In this embodiment, the number of layers of the carbon fiber material 11 is three, and the total thickness is not more than 0.8 mm. The three layers of carbon fiber material 11 can significantly improve the mechanical strength of the magnetic steel, preventing deformation or rupture under high-speed rotation or high load conditions. The carbon fiber material 11 has good impact resistance and can absorb and disperse external impact force, protecting the magnetic steel block 10 from damage. The total thickness of the carbon fiber is not more than 0.8 mm, making the overall weight of the motor lighter, especially suitable for application fields with strict requirements on weight.

[0032] The working principle is as follows:

[0033] When the main shaft 1 rotates, the rotor core 8, the punching sheet 9, the magnetic steel block 10 and other components synchronously rotate, the magnetic steel blocks 10 are uniformly arranged on the outer periphery of the punching sheet 9, the magnetic circuit is more uniform, the rotor rotates more stably, the vibration and noise are smaller, the balance is better, the outer periphery of the magnetic steel is wrapped with the carbon fiber material 11, the carbon fiber can prevent the magnetic steel block 10 from loosening due to centrifugal force when the rotor rotates at high speed, so as to protect the magnetic steel block 10 from being damaged, improve the service life of the motor, meanwhile, the carbon fiber has good insulation performance, can effectively reduce the eddy current loss of the surface of the magnetic steel, the eddy current loss is the current caused by the alternating magnetic field in the conductor, which can cause energy loss and heat, the carbon fiber layer can prevent the formation of eddy current, improve the efficiency of the motor, in addition, the heat generated when the rotor rotates can be conducted out through the blade 2, meanwhile, the air flow in the middle of the rotor core 8 can be accelerated when the blade 2 rotates, so as to be beneficial to the heat dissipation and improve the heat dissipation capacity, meanwhile, the blade 2 is fixed by the screw 3, which can be convenient for disassembly, replacement and maintenance.

[0034] The above is only the embodiment of the utility model, the utility model is not limited to the field involved in the embodiment, the specific structure and the characteristics and other common knowledge in the scheme are not described too much herein. It should be pointed out that, for those skilled in the art, without departing from the structure of the utility model, a number of deformations and improvements can be made, which should also be considered as the protection scope of the utility model, which will not affect the effect and the practicability of the utility model. The protection scope of the application should be subject to the content of the claims, and the specific implementation mode and other records in the specification can be used to explain the content of the claims.

Claims

1. A rotor structure of a surface-mounted permanent magnet motor, comprising a main shaft and a rotor core fixed on the main shaft, characterized in that: a punching sheet is arranged on the outer periphery of the rotor core, the edge of the punching sheet is annularly and uniformly provided with a plurality of grooves, and the grooves are filled with a plurality of magnetic steel blocks; the bottom and two sides of the magnetic steel blocks are fixed to the bottom and two side walls of the grooves by means of high-temperature-resistant high-strength adhesive; the outer periphery of the magnetic steel blocks is further fixed with a plurality of layers of carbon fiber material; the end face of the rotor core is fixed with a ring plate, and the ring plate is fixed with L-shaped blades. The number of fixed layers of the carbon fiber material is three, and the total thickness is not more than 0.8 mm. Both ends of the punching sheet are further provided with end plates, and the end plates pull the punching sheet tight through screws and nuts. The diameter of one of the end plates is greater than the outer circle diameter of the punching sheet, the diameter of the other end plate is less than the outer circle diameter of the punching sheet, and the outer circle diameter is less than the punching sheet.

2. A surface-mounted permanent-magnet machine rotor structure according to claim 1, characterized in that: The end plate of the punching sheet is further fixed with a cover plate.

3. A surface-mounted permanent magnet machine rotor structure according to claim 2, characterized in that: The end plate of the punching sheet is further fixed with an arc-shaped key.

4. A surface-mounted permanent-magnet machine rotor structure according to claim 3, characterized in that: ​ 5. A surface-mounted permanent-magnet machine rotor structure according to claim 4, characterized in that: ​

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