Ultrahigh-speed permanent magnet motor rotor with salient pole effect

Abstract

The superspeed permanent magnet motor rotor with the salient pole effect comprises a shaft sleeve, a front section shaft, a front magnetic isolation block, a permanent magnet, a rear magnetic isolation block and a rear section shaft are sequentially installed in the shaft sleeve, the front section shaft, the front magnetic isolation block, the permanent magnet, the rear magnetic isolation block and the rear section shaft are sequentially connected, and a magnetic conduction block is arranged between the permanent magnet and the radial direction of the shaft sleeve. The front magnetism isolating block, the permanent magnet and the rear magnetism isolating block are cylindrical and have the same outer diameter; magnetic conductive grooves are symmetrically formed in the periphery of the permanent magnet, and magnetic conductive blocks are bonded in the magnetic conductive grooves through glue. According to the characteristic that the permanent magnets and the magnetic conductive blocks are different in magnetic conductivity, the magnetic conductive blocks in the grooves of the special-shaped permanent magnets are utilized, so that the d-axis and the q-axis of the rotor are different in magnetic resistance, a salient pole effect is achieved, magnetic resistance torque is further generated, and the power density of the motor is increased.

Description

Technical Field

[0001] The utility model belongs to the technical field of motors and relates to a rotor of a super-high-speed permanent magnet motor with salient pole effect. Background Technique

[0002] Super-high-speed permanent magnet motors have the advantages of small volume, high power density, high reliability, etc., and are widely used in many fields, such as fuel vehicles, turbocharging systems, space vehicles, high-speed grinders, etc. The existing high-speed motor rotor structure is as Figure 1 shown. Its main components include a front shaft section, a front balance weight, a cylindrical permanent magnet, an alloy sheath, a rear balance weight, and a rear shaft section. The permanent magnet is concentrically arranged with the front shaft section and the rear shaft section. The front and rear balance weights are used to limit the axial displacement of the permanent magnet. The alloy sheath is in interference fit with the front shaft and the rear shaft to drive the permanent magnet to rotate and play a protective role at the same time.

[0003] The super-high-speed permanent magnet motor has a compact structure. On the one hand, the outer diameter and axial length of the rotor are restricted by strength and stiffness respectively, resulting in an upper limit for the finite volume of the rotor. On the other hand, restricted by the heat dissipation method and temperature rise, there is an upper limit for the loss density. Eventually, the torque density of the motor is limited, and it is difficult to achieve a higher power density and power level. Summary of the Invention

[0004] The purpose of the utility model is to provide a rotor of a super-high-speed permanent magnet motor with salient pole effect, which can solve the above problems and increase the power density of the motor.

[0005] According to the technical solution provided by the utility model: A rotor of a super-high-speed permanent magnet motor with salient pole effect includes a bushing. A front shaft section, a front magnetic isolation block, a permanent magnet, a rear magnetic isolation block, and a rear shaft section are sequentially installed in the bushing. The front shaft section, the front magnetic isolation block, the permanent magnet, the rear magnetic isolation block, and the rear shaft section are sequentially connected. A magnetic conduction block is arranged between the permanent magnet and the radial direction of the bushing.

[0006] As a further improvement of the utility model, the front magnetic isolation block, the permanent magnet, and the rear magnetic isolation block are cylindrical and have the same outer diameter; the three are bonded with glue.

[0007] As a further improvement of the utility model, magnetic conduction grooves are symmetrically opened on the outer periphery of the permanent magnet, and magnetic conduction blocks are bonded in the magnetic conduction grooves with glue.

[0008] As a further improvement of the utility model, the magnetic conduction blocks are aligned with the ends of the permanent magnet.

[0009] As a further improvement of the utility model, the magnetic conduction grooves and the magnetic conduction blocks are in a matching rectangular shape.

[0010] As a further improvement of the utility model, the magnetic conduction blocks are made of magnetic conduction materials, such as silicon steel sheets.

[0011] As a further improvement of the present utility model, the front shaft and the rear shaft are made of steel and have a T-shaped structure.

[0012] As a further improvement of the present utility model, the shaft sleeve is made of alloy material; it is pretreated by a thermal expansion process and then the front shaft, the front magnetic isolation block, the permanent magnet, the rear magnetic isolation block, and the rear shaft are installed by interference fit.

[0013] The positive and progressive effects of this application are as follows:

[0014] According to the characteristics of different magnetic permeabilities of the permanent magnet and the magnetic conduction block, the present utility model utilizes the magnetic conduction block in the groove of the special-shaped permanent magnet to make the magnetic reluctances of the d-axis and q-axis of the rotor different, with salient pole effect, thereby generating reluctance torque and increasing the power density of the motor. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] Figure 2 It is a sectional view of the present utility model. Detailed Embodiment

[0017] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0018] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of the present utility model described herein. In addition, similar terms such as "including" and "having" mean that in addition to the content already listed in "including" and "having", it can also "include" and "have" other content not yet listed; for example, a process, method, system, product, or device that can include a series of steps or units does not have to be limited to those steps or units that have been clearly listed, but can include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or devices.

[0020] Due to the drawing angle problem, some components may not be drawn, but their positions and connection relationships can be understood according to the text description part.

[0021] As Figure 1 As shown, the utility model is a super-high-speed permanent magnet motor rotor with salient pole effect, including a shaft sleeve 4. Inside the shaft sleeve 4, a front shaft section 1, a front magnetic isolation block 9, a permanent magnet 7, a rear magnetic isolation block 10, and a rear shaft section 6 are sequentially installed. The front shaft section 1, the front magnetic isolation block 9, the permanent magnet 7, the rear magnetic isolation block 10, and the rear shaft section 6 are sequentially connected. A magnetic conduction block 8 is provided between the permanent magnet 7 and the shaft sleeve 4 in the radial direction.

[0022] The front magnetic isolation block 9, the permanent magnet 7, and the rear magnetic isolation block 10 are cylindrical and have the same outer diameter; the three are bonded together with glue.

[0023] As Figure 2 As shown, magnetic conduction grooves are symmetrically opened on the outer periphery of the permanent magnet 7. The magnetic conduction blocks 8 are bonded in the magnetic conduction grooves with glue, and the magnetic conduction blocks 8 are aligned with the ends of the permanent magnet 7. The magnetic conduction grooves and the magnetic conduction blocks 8 are in a matching rectangular shape. The magnetic conduction blocks 8 are made of magnetic conduction materials, such as silicon steel sheets.

[0024] The front shaft section 1 and the rear shaft section 6 are made of steel and have a T-shaped structure, and their outer ends are used to realize the installation of the rotor.

[0025] The shaft sleeve 4 is made of alloy material. It is pretreated by a thermal expansion process and then the front shaft section 1, the front magnetic isolation block 9, the permanent magnet 7, the rear magnetic isolation block 10, and the rear shaft section 6 are installed by interference fit.

[0026] The working process of the utility model is as follows:

[0027] Utilizing the characteristic that the magnetic permeabilities of the permanent magnet 7 and the magnetic conduction block 8 are different, the magnetic reluctances of the d-axis and q-axis of the rotor are different, with salient pole effect, thereby generating magnetic reluctance torque and increasing the power density of the motor.

[0028] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle of the utility model. However, the utility model is not limited thereto. For those of ordinary skill in the art, various variations and improvements can be made without departing from the spirit and essence of the utility model, and these variations and improvements are also regarded as the protection scope of the utility model.

Claims

1. An ultra-high-speed permanent magnet motor rotor with salient pole effect, characterized in that: The invention comprises a shaft sleeve (4), wherein a front shaft section (1), a front magnetic separation block (9), a permanent magnet (7), a rear magnetic separation block (10), and a rear shaft section (6) are sequentially mounted in the shaft sleeve (4); the front shaft section (1), the front magnetic separation block (9), the permanent magnet (7), the rear magnetic separation block (10), and the rear shaft section (6) are sequentially connected; and a magnetic conductive block (8) is provided between the permanent magnet (7) and the shaft sleeve (4) in a radial direction.

2. The ultra-high-speed permanent magnet motor rotor with salient pole effect according to claim 1, characterized in that: The front magnetic separator (9), the permanent magnet (7) and the rear magnetic separator (10) are cylindrical and have the same outer diameter; the three are bonded together using glue.

3. The ultra-high-speed permanent magnet motor rotor with salient pole effect according to claim 1, characterized in that: Magnetic conductive grooves are symmetrically provided on the outer periphery of the permanent magnet (7), and magnetic conductive blocks (8) are bonded in the magnetic conductive grooves by glue.

4. The ultra-high-speed permanent magnet motor rotor with salient pole effect according to claim 3, characterized in that: The magnetic conductive block (8) is aligned with the end of the permanent magnet (7).

5. The ultra-high-speed permanent magnet motor rotor with salient pole effect according to claim 3, characterized in that: The magnetic conductive groove and the magnetic conductive block (8) are in a matching rectangular shape.

6. The ultra-high-speed permanent magnet motor rotor with salient pole effect according to claim 1, characterized in that: The magnetic conductive block (8) is made of magnetic conductive material, such as silicon steel sheet.

7. The ultra-high-speed permanent magnet motor rotor with salient pole effect according to claim 1, characterized in that: The front shaft (1) and the rear shaft (6) are made of steel and have a T-shaped structure.

8. The ultra-high-speed permanent magnet motor rotor with salient pole effect according to claim 1, characterized in that: The shaft sleeve (4) is made of alloy material; it is pre-treated by a thermal expansion process, and then the front shaft section (1), the front magnetic separator block (9), the permanent magnet (7), the rear magnetic separator block (10), and the rear shaft section (6) are installed by interference fit.

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