Permanent magnet rotor with inner pole number and outer pole number

Abstract

The utility model relates to the technical field of motors, in particular to a permanent magnet rotor with internal and external double poles. According to the permanent magnet rotor with the inner and outer pole numbers, the size of the rotor is reduced, the outer magnetic steel and the inner magnetic steel are concentrically arranged in the radial direction, and compared with two sets of permanent magnet rotors with different pole numbers, the integrated size is smaller; the rotor only has magnetic steel and does not contain a winding, so that heat of the winding is prevented from being conducted to the magnetic steel, and heat dissipation is improved; the magnetic steel is separated from the winding, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a permanent magnet rotor with double pole numbers inside and outside. Background Technique

[0002] The speed regulation operation of motors is a recognized very effective energy-saving method. Permanent magnet motors are one of the mainstream directions of current high-efficiency motors. There are many studies on motor speed regulation methods and motor bodies. The patent "ZL 2022 21004892.9 A speed regulation motor" proposes a speed regulation motor. This motor belongs to a double-rotor speed regulation motor, with two sets of motors arranged radially. The outer layer is a permanent magnet generator, and the inner layer is a motor. The output speed is adjusted by controlling the winding current of the generator, and the slip energy generated by speed regulation is recovered. This scheme has excellent energy-saving effects, but it also has its deficiencies. The middle rotor of this scheme integrates the windings of the motor part and the permanent magnets of the generator part. There are some problems with this scheme: ① The mechanical volume of this scheme is relatively large. The magnetic circuit space required for the windings of the middle rotor and the magnetic circuit space required for the permanent magnets are independent of each other, and the magnetic materials are not fully utilized; ② This scheme is not conducive to heat dissipation. The heat generated by the current in the winding part is easily conducted to the magnetic steel; ③ This scheme is not conducive to production and manufacturing. The installation of the windings and the installation of the magnetic steel belong to different manufacturing processes, and the process difficulties also vary greatly. Binding the two together causes many inconveniences in production. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is that the traditional double-rotor speed regulation motor has a relatively large mechanical volume, poor heat dissipation effect, and difficult production and manufacturing.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a permanent magnet rotor with double pole numbers inside and outside, which is composed of a magnetic conduction carrier with sufficient magnetic conduction function, an outer layer of magnetic steel and an inner layer of magnetic steel. The outer layer of magnetic steel is fixed on the outside of the magnetic conduction carrier in an annular array manner, the inner layer of magnetic steel is fixed on the inside of the magnetic conduction carrier in an annular array manner, and an output shaft is axially fixed inside the inner winding rotor.

[0005] The number of pole pairs of the outer layer of magnetic steel and the inner layer of magnetic steel are not equal. Matching with the outer winding stator and the inner winding rotor with different pole numbers designed correspondingly, a new type of double-rotor speed regulation motor can be formed.

[0006] The relative speed △n2 between the inner winding rotor and the middle rotor, and the relative speed △n1 between the middle rotor and the outer winding stator. The finally output speed n = △n2 - △n1.

[0007] Both the outer layer of magnetic steel and the inner layer of magnetic steel are composed of an even number of independent magnetic steels, and are arranged radially and concentrically on the magnetic conduction carrier.

[0008] Both the outer permanent magnet and the inner permanent magnet are fixedly assembled with the magnetic conduction carrier in an embedded or surface-mounted manner.

[0009] The beneficial effects of the present utility model are as follows:

[0010] (1) The inner and outer bipolar permanent magnet rotor of the present utility model reduces the rotor volume. The outer permanent magnet and the inner permanent magnet are arranged concentrically in the radial direction. Compared with independently designing two sets of permanent magnet rotors with different pole numbers, the integrated volume is smaller.

[0011] (2) This rotor only has permanent magnets and no windings, avoiding the heat conduction of the windings to the permanent magnets and improving heat dissipation.

[0012] (3) Separating the permanent magnets from the windings improves production efficiency. Description of the Drawings

[0013] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0014] Figure 1 is a schematic structural diagram of the present utility model.

[0015] Figure 2 is a partial schematic diagram of the present utility model.

[0016] Figure 3 is a schematic diagram of the magnetic field line distribution path in the present utility model. Detailed Embodiments

[0017] The present utility model will now be further described in detail in conjunction with the drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0018] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connected to" 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 directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0019] Figure 1 and Figure 2An internal and external bipolar permanent magnet rotor and its application example are shown, including an outer winding stator 1 and an inner winding rotor 2. An internal and external bipolar permanent magnet rotor, also known as an intermediate rotor, is arranged between the outer winding stator 1 and the inner winding rotor 2. The internal and external bipolar permanent magnet rotor is composed of a magnetic conduction carrier 3 with sufficient magnetic conduction function, an outer layer of magnetic steel 4, and an inner layer of magnetic steel 5. The outer layer of magnetic steel 4 is fixed on the outside of the magnetic conduction carrier 3 in an annular array manner, which can be mounted on the surface or inserted into the holes. The inner layer of magnetic steel 5 is fixed on the inside of the magnetic conduction carrier 3 in an annular array manner. An output shaft 6 is axially fixed inside the inner winding rotor 2.

[0020] The magnetic conduction carrier 3 should have sufficient magnetic conduction function electromagnetically and needs to carry the magnetic flux of the outer layer of magnetic steel 4 and the inner layer of magnetic steel 5; structurally, the magnetic conduction carrier 3 itself is the main body of the rotor. The material of this part can be selected as silicon steel sheets or low-carbon steel.

[0021] The number of pole pairs of the outer layer of magnetic steel 4 is not equal to that of the inner layer of magnetic steel 5. It can be more in the outer layer, or more in the inner layer, and there is no fixed multiple requirement. The outer layer of magnetic steel 4 and the inner layer of magnetic steel 5 are arranged in two layers inside and outside, and are arranged into the required number of poles according to needs.

[0022] The relative speed Δn2 between the inner winding rotor 2 and the intermediate rotor, and the relative speed Δn1 between the intermediate rotor and the outer winding stator 1. The finally externally output speed n = Δn2 - Δn1.

[0023] The basic formula for electromagnetic parameters and speed is: In the formula, f: current frequency Hz; n: speed rpm; p: number of pole pairs. As Figure 1 Shown is a double-rotor permanent magnet speed regulation motor. The inner layer of magnetic steel 5 has 4 poles (p = 2), and the outer layer of magnetic steel 4 has 20 poles (p = 10). The inner winding rotor 2 is the output shaft, and the inner winding is connected to a 50Hz power frequency electricity. Then, from formula 1-1, it can be known that the relative speed Δn2 between the inner winding rotor 2 and the intermediate rotor is 1500rpm. At this time, by adjusting the electrical parameters of the outer winding stator 1, the relative speed Δn1 between the intermediate rotor and the outer winding stator 1 can be adjusted. The finally externally output speed n = Δn2 - Δn1. For example, when it is necessary to output 900rpm, the electrical frequency f1 of the outer winding stator 1 = (1500 - 900) * 10 / 60 = 100Hz.

[0024] The outer layer of magnetic steel 4 is composed of 20 independent magnetic steels, and the inner layer of magnetic steel 5 is composed of 4 independent magnetic steels, and they are arranged radially and concentrically on the magnetic conduction carrier 3.

[0025] Both the outer layer of magnetic steel 4 and the inner layer of magnetic steel 5 are fixedly assembled with the magnetic conduction carrier 3 by means of inlay or surface mounting.

[0026] As Figure 3As shown, for the bipolar permanent magnet rotor, the outer layer of magnetic steel 4 is designed with 20 poles, and the inner layer of magnetic steel 5 is designed with 4 poles. After integration, the magnetic flux density inside the magnetic conduction carrier 3 still remains at a reasonable level, and the overall volume achieves the effect of 1 + 1 < 2. The outer layer of magnetic steel 4 and the inner layer of magnetic steel 5 arranged radially concentrically have a smaller integrated volume compared to independently designing two permanent magnet rotors with different pole numbers. The magnetic flux will be distributed along the path of the minimum magnetic resistance.

[0027] Inspired by the ideal embodiments of the present utility model described above, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A permanent magnet rotor with internal and external bipolar numbers, characterized in that: It includes a magnetic conductive carrier (3) with sufficient magnetic conductivity, an outer layer of permanent magnets (4) and an inner layer of permanent magnets (5). The outer layer of permanent magnets (4) is fixed on the outside of the magnetic conductive carrier (3) in an annular array manner, and the inner layer of permanent magnets (5) is fixed on the inside of the magnetic conductive carrier (3) in an annular array manner.

2. A kind of internal and external bipolar permanent magnet rotor according to claim 1, characterized in that: The number of pole pairs of the outer layer of permanent magnets (4) and the inner layer of permanent magnets (5) is not equal.

3. A kind of internal and external bipolar permanent magnet rotor according to claim 1, characterized in that: Both the outer layer of permanent magnets (4) and the inner layer of permanent magnets (5) are composed of an even number of independent permanent magnets and are arranged radially and concentrically on the magnetic conductive carrier (3).

4. A kind of internal and external bipolar permanent magnet rotor according to claim 1, characterized in that: Both the outer layer of permanent magnets (4) and the inner layer of permanent magnets (5) are fixedly assembled with the magnetic conductive carrier (3) by means of embedding or surface mounting.

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