Permanent magnet auxiliary synchronous reluctance motor rotor

Abstract

The invention provides a permanent magnet auxiliary synchronous reluctance motor rotor which comprises an amplitude shaft, one end of the amplitude shaft is connected with a rotating shaft, the other end of the amplitude shaft is connected with a rotor iron core, pressing plates are fixedly installed on the two sides of the rotor iron core, and the rotor iron core is formed by laminating multiple layers of rotor punching sheets. An even number of rectangular magnetic barriers are uniformly distributed on each layer of rotor punching sheet along the circumferential direction, and ventilating ducts are arranged on two sides of each rectangular magnetic barrier. According to the synchronous reluctance motor provided with the reluctance motor rotor provided by the invention, the motor power is increased and the efficiency is improved under the condition that a small number of permanent magnets are added under the condition of the same specification and size, and through the design of the ventilating ducts on the rotor punching sheets, the air flow is increased, the heat dissipation of the motor is enhanced, and the temperature rise of the motor is reduced in the running process of the motor; the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of motor rotors, and in particular to a permanent magnet assisted synchronous reluctance motor rotor. Background Art

[0002] Synchronous reluctance motors have low prices and better performance, but they have low efficiency and high energy consumption, so they cannot be widely used. Permanent magnet synchronous motors have high efficiency, simple structure, and small size, but they use large amounts of rare earth permanent magnets and are expensive. The development of rare earth permanent magnets has certain damage to the environment, so permanent magnet synchronous motors are relatively expensive.

[0003] In addition, the synchronous reluctance motor rotor punching sheets used in the prior art have the following deficiencies: (1) a grid magnetic barrier is punched out around the punching sheet, which occupies a large space in the rotor, making it impossible to reasonably arrange the permanent magnet material; (2) the elliptical magnetic barrier structure causes the motor to have only the characteristics of a reluctance motor, without the accompanying permanent magnet characteristics. Under the same specifications and volume, the motor has low power and low efficiency, and cannot meet the application range of limited space.

[0004] Therefore, how to solve the problem of reducing the price of permanent magnet synchronous motors under the same power level and the low power and low efficiency of three-phase reluctance motors under the same specifications and volume.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art. The present invention provides a permanent magnet assisted synchronous reluctance motor rotor, which, compared with the reluctance motor, can achieve the characteristics of high motor power and high efficiency under the same specifications of volume.

[0007] A permanent magnet assisted synchronous reluctance motor rotor of the present invention comprises a width shaft, one end of the width shaft is connected to a rotating shaft, and the other end is connected to a rotor core, pressure plates are fixedly installed on both sides of the rotor core, and the rotor core is laminated by multiple layers of rotor punchings, each layer of rotor punchings is evenly distributed with an even number of rectangular magnetic barriers along the circumferential direction, and ventilation ducts are arranged on both sides of each of the rectangular magnetic barriers.

[0008] Furthermore, the rectangular magnetic barrier is composed of three permanent magnets of different lengths, and ventilation ducts are arranged on both sides of each permanent magnet.

[0009] Further, the three permanent magnets in the permanent magnet group are arranged horizontally with each other along the radial direction of the rotor punching sheet, and the lengths of the three permanent magnets in the direction away from the center of the rotor punching sheet decrease successively.

[0010] Furthermore, the permanent magnet is a rectangular structure.

[0011] Furthermore, the centers of the three permanent magnets in the permanent magnet group are located on the same radius of the rotor punching.

[0012] Furthermore, the rotor core and the pressure plate are both provided with corresponding light holes, and after the double-headed screw passes through the light holes on the pressure plate and the rotor core in turn, nuts are used at both ends of the double-headed screw to fix and press the pressure plate and the rotor core.

[0013] Furthermore, one end of the width shaft connected to the rotating shaft is fixed on the rotating shaft by using a shrink-fit process.

[0014] Furthermore, the rotor core is fixedly connected to the width shaft via a key.

[0015] Furthermore, the reluctance motor rotor is mounted on a permanent magnet assisted synchronous reluctance motor.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. Compared with the traditional synchronous reluctance motor, the motor equipped with the permanent magnet assisted synchronous reluctance motor rotor provided by the present invention has significantly improved motor power and increased efficiency under the same specifications and volume by adding a small amount of permanent magnets;

[0018] 2. The motor rotor provided by the present invention is designed with a unique rotor punching structure and a permanent magnet fixing method, which ensures that the motor has the characteristics of a reluctance motor during operation, while also increasing the performance of some permanent magnet motors, ensuring the best performance under the same specifications;

[0019] 3. The design of the rotor punching provided by the present invention has the function of magnetic barriers on the d and q axes of the reluctance motor, and is provided with a good heat dissipation and ventilation structure at the position of the permanent magnet, which ensures the high performance of the motor while having good heat dissipation conditions and reduces the temperature rise of the motor;

[0020] 4. The rotor punching provided by the present invention has a ventilation duct structure, which ensures that during the operation of the motor, air flow is increased, the heat dissipation of the motor is enhanced, the temperature rise of the motor is reduced, and the service life of the motor is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the rotor of the permanent magnet assisted synchronous reluctance motor of the present invention;

[0022] Figure 2 It is a schematic structural diagram of the rotor punching sheet of the permanent magnet assisted synchronous reluctance motor of the present invention;

[0023] Among them, 1-rotating shaft; 2-width shaft; 3-rotor iron core; 4-pressure plate; 5-double-headed screw; 6-nut; 7-key; 31-rotor punching sheet; 311-permanent magnet; 312-ventilation duct. DETAILED DESCRIPTION

[0024] The embodiments of the present invention will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention.

[0025] The present invention provides a permanent magnet assisted synchronous reluctance motor rotor. The permanent magnet assisted synchronous reluctance motor combines the characteristics of a synchronous reluctance motor and a permanent magnet synchronous motor. The motor makes full use of reluctance torque and permanent magnet torque, and has significant advantages such as high power density, high efficiency, wide speed regulation range, small size, light weight, and low price. The permanent magnet assisted synchronous reluctance motor is developed from the synchronous reluctance motor. By adding permanent magnet material to the magnetic barrier to provide direct-axis permanent magnet flux, it can increase its cross and direct axes to improve the reluctance torque. In addition, the permanent magnet material added to the rotor magnetic barrier generates permanent magnet torque, which increases the torque density of the motor, thereby effectively overcoming the shortcomings of the low power factor and low torque density of the synchronous reluctance motor itself.

[0026] According to an embodiment of the present invention, Figure 1 As shown, a permanent magnet assisted synchronous reluctance motor rotor of the present invention is mainly composed of a rotating shaft 1, a width shaft 2, a rotor core 3, a pressure plate 4, a double-headed screw 5, a nut 6 and a key 7. One end of the width shaft 2 is connected to the rotating shaft 1, and the other end is connected to the rotor core 3. The pressure plates 4 are fixedly installed on both sides of the rotor core 3. The rotor core 3 is laminated by multiple layers of rotor punchings 31. Each layer of rotor punchings 31 is evenly fixed with an even number of rectangular magnetic barriers along the circumferential direction, and ventilation ducts 312 are arranged on both sides of each rectangular magnetic barrier. The double-headed screw 5 passes through the light holes in the rotor core 3 and the pressure plate 4, and the rotor core 3 and the pressure plate 4 are pressed by nuts 6; the width shaft 2 is fixed to the rotating shaft 1 by a shrink-fit process; the rotor core 3 is fixed to the width shaft 2 by a key 7. By adding permanent magnets 311 to the rotor structure, the present invention significantly improves the motor power and increases the efficiency without increasing the motor volume compared to the synchronous reluctance motor.

[0027] According to an embodiment of the present invention, Figure 2As shown, the rectangular magnetic barrier is composed of three permanent magnets 311 of different lengths, and the permanent magnets are rectangular structures. A ventilation duct 312 is provided on both sides of each permanent magnet 311. The three permanent magnets 311 in the permanent magnet group are arranged horizontally with each other along the radial direction of the rotor punching 31, and the lengths of the three permanent magnets 311 in the direction away from the center of the rotor punching 31 are reduced successively. The centers of the three permanent magnets 311 in the permanent magnet group are located on the same radius of the rotor punching 31. Ventilation ducts 312 are provided on both sides of the rectangular magnetic barrier, 3 ducts are provided on one side, and 6 ducts 312 are provided on both sides, which can ensure good heat dissipation conditions during the operation of the motor.

[0028] According to an embodiment of the present invention, the rectangular magnetic barriers located on the same rotor punching 31 are evenly distributed along the circumference of the rotor punching 31, as shown in the attached figure. Figure 2 As shown, there are 16 rectangular magnetic barriers on the rotor punching sheet 31, and one rectangular magnetic barrier corresponds to 6 ventilation ducts 312. The ventilation ducts 312 connected to three permanent magnets 311 in the same rectangular magnetic barrier are designed from large to small in size from outside to inside in sequence for the permanent magnets 311 arranged in sequence from the center to the edge of the rotor punching sheet 31. In actual application, the number of rectangular magnetic barriers can be adjusted according to the size of the rotor punching sheet 31. The present invention can ensure that the AC and DC axis inductances only differ in magnetic resistance torque when the motor is running stably through the design of rectangular magnetic barriers on the rotor punching sheet 31. At the same time, the permanent magnets 311 placed in the rectangular magnetic barriers can increase the motor power and improve efficiency. The design of the ventilation duct 312 on the rotor punching sheet 31 ensures that during the operation of the motor, air flow is increased, the heat dissipation of the motor is enhanced, the temperature rise of the motor is reduced, and the service life of the motor is extended.

[0029] According to an embodiment of the present invention, the rotor core 3 provided by the present invention is formed by laminating multiple layers of rotor punchings 31. When multiple rotor punchings 31 are laminated, the rectangular magnetic barriers and ventilation ducts 312 on each rotor punching 31 are aligned one by one through a positioning axis and then laminated.

[0030] According to an embodiment of the present invention, a rectangular magnetic barrier is cut in the rotor punching sheet 31, and the permanent magnet assisted synchronous reluctance motor mainly relies on the difference between the AC and DC axis inductances to generate reluctance torque. During stable operation, the rectangular magnetic barrier ensures the difference between the d-axis and q-axis reluctances, generates reluctance torque, and ensures the synchronous speed operation of the motor; at the same time, permanent magnets 311 can be placed in the rectangular magnetic barrier, and the permanent magnets 311 can generate magnetic field strength, and under the action of the stator magnetic field, the torque and power of the motor are improved.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A permanent magnet assisted synchronous reluctance motor rotor, characterized in that: The invention comprises a width shaft (2), one end of the width shaft (2) is connected to a rotating shaft (1), and the other end is connected to a rotor core (3), and pressure plates (4) are fixedly mounted on both sides of the rotor core (3). The rotor core (3) is formed by laminating multiple layers of rotor punching sheets, each layer of rotor punching sheets (31) is evenly distributed with an even number of rectangular magnetic barriers along the circumferential direction, and ventilation ducts (312) are arranged on both sides of each rectangular magnetic barrier.

2. The permanent magnet assisted synchronous reluctance motor rotor according to claim 1, characterized in that: The rectangular magnetic barrier is composed of three permanent magnets (311) of different lengths, and ventilation ducts (312) are arranged on both sides of each permanent magnet (311).

3. The permanent magnet assisted synchronous reluctance motor rotor according to claim 2, characterized in that: The three permanent magnets (311) in the permanent magnet group are arranged horizontally with respect to each other along the radial direction of the rotor punching sheet (31), and the lengths of the three permanent magnets (311) decrease in sequence along a direction away from the center of the rotor punching sheet (31).

4. The permanent magnet assisted synchronous reluctance motor rotor according to claim 2, characterized in that: The permanent magnet (311) is a rectangular structure.

5. The permanent magnet assisted synchronous reluctance motor rotor according to any one of claims 2 to 4, characterized in that: The centers of the three permanent magnets (311) in the permanent magnet group are located on the same radius of the rotor punching sheet (31).

6. The permanent magnet assisted synchronous reluctance motor rotor according to claim 1, characterized in that: The rotor core (3) and the pressure plate (4) are both provided with corresponding light holes. After the double-headed screw (5) passes through the light holes on the pressure plate (4) and the rotor core (3) in turn, nuts (6) are used at both ends of the double-headed screw (5) to fix and press the pressure plate (5) and the rotor core (3).

7. The permanent magnet assisted synchronous reluctance motor rotor according to claim 1, characterized in that: One end of the width shaft (2) connected to the rotating shaft (1) is fixed on the rotating shaft (1) by using a shrink-fit process.

8. The permanent magnet assisted synchronous reluctance motor rotor according to claim 1, characterized in that: The rotor core (2) is fixedly connected to the span shaft (2) via a key (7).

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