A five-phase motor with nanocrystalline stator core

Abstract

This invention discloses a five-phase motor with a nanocrystalline stator core, comprising a stator module and a rotor. The stator has a pentagonal structure, with each side composed of several stator tooth modules and permanent magnets. The stator tooth modules have a U-shaped structure and are made of nanocrystalline material, with slots for embedded windings. The rotor has several rotor teeth evenly distributed along its circumference, and the rotor teeth have a fan-shaped structure radially, inclined at a certain angle to the rotor axis to solve the problem of uneven air gap magnetic field. The pentagonal structure of the stator solves the problem of the difficulty in processing nanocrystalline material into conventional motor stator cores. Motors using nanocrystalline stator core material can effectively reduce core loss and improve motor efficiency during high-speed operation.

Description

Technical Field

[0001] This invention relates to a five-phase motor with a nanocrystalline stator core, belonging to the field of permanent magnet motor technology. Background Technology

[0002] High-speed motors, characterized by high power density, fast dynamic response, and high transmission efficiency, are increasingly widely used in precision machining, new energy, and aerospace fields. However, the increased frequency of magnetic flux change within the core of a high-speed motor leads to a sharp increase in core losses. Therefore, seeking high-performance, low-loss ferromagnetic materials has become a crucial direction for improving the performance and technological advancement of high-speed motors. Nanocrystalline materials, as a novel material, can be used to manufacture motor cores for higher speeds and smaller volumes. Nanocrystalline alloy strips combine the advantages of silicon steel, alloys, and ferrites. A high saturation magnetic flux density can effectively solve a series of problems caused by the saturation effect of conventional core materials, such as motor overheating, winding insulation aging, and inductance reduction. High permeability means: 1. Fewer winding turns, saving materials and reducing motor size; 2. Low loss characteristics, especially effective in reducing temperature rise caused by iron loss when the motor operates at high frequencies; 3. High core permeability reduces excitation power, requires fewer winding turns, reduces copper loss, and improves motor efficiency; 4. High operating magnetic flux density and power density, reducing core size; 5. Strong overload capacity, as the high magnetic flux density of nanocrystalline materials can withstand the heat generated by increased magnetic flux during overload, preventing motor burnout. However, because nanocrystalline strips are thin and hard, they are difficult to cut and shape. To ensure smooth, precise, and reliable motor operation, a special structure motor with a nanocrystalline core is required to improve high-speed performance. Summary of the Invention

[0003] Purpose of the invention: In view of the above-mentioned prior art, a five-phase motor with a nanocrystalline stator core is proposed to solve the problems of high stator core loss caused by conventional stator cores and the difficulty in cutting nanocrystalline materials, which prevents their application in the field of motor technology.

[0004] Technical solution: A five-phase motor with a nanocrystalline stator core includes a rotor and five stator modules. The five stator core modules are evenly arranged along the circumference of the rotor to form a pentagonal structure. Each stator module includes two stator tooth modules and a permanent magnet, with the permanent magnet disposed between the two stator tooth modules. The stator tooth modules are made of nanocrystalline material. The stator tooth modules have stator slots, and windings are embedded in the stator slots. The rotor surface has inclined rotor teeth evenly distributed along the circumference.

[0005] Furthermore, depending on the number of phases of the motor, the stator gear module can be an asymmetrical or symmetrical structure.

[0006] Furthermore, the rotor teeth have a fan-shaped cross-section.

[0007] Furthermore, the stator tooth module is formed by laminating nanocrystalline alloy strips and impregnating them with acrylic resin to form a block core, which is then cut using electrical discharge machining.

[0008] Beneficial Effects: Nanocrystalline iron cores not only possess strong saturation magnetic induction intensity but also have advantages such as high magnetic permeability, thinness, and good temperature stability. They are a green, efficient, and energy-saving core material that can reduce iron loss in conventional stator cores. Especially for high-speed and ultra-high-speed motors, nanocrystalline materials as cores can significantly improve motor efficiency and achieve high energy savings. However, the thin and brittle nature of nanocrystalline materials makes it difficult to cut stator cores into conventional shapes, and the complex processing can severely affect the electromagnetic properties of nanocrystalline materials. The nanocrystalline stator core five-phase motor proposed in this invention involves laminating nanocrystalline alloy strips and impregnating them with acrylic resin to form a block core. Then, electrical discharge machining is used to cut the laminated block core into U-shaped stator tooth modules. These modules are then assembled into a pentagonal structure to form the nanocrystalline stator core five-phase motor. This motor structure simplifies the processing of nanocrystalline iron core modules and does not affect the high performance of the nanocrystalline material. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the two-dimensional structure of a five-phase motor with a nanocrystalline stator core;

[0010] Figure 2 This is a schematic diagram of the structure of a symmetrical stator gear module;

[0011] Figure 3 This is a schematic diagram of the rotor structure;

[0012] Figure 4 The diagram shows the back electromotive force under no-load conditions.

[0013] Figure 5 The stator teeth are made of nanocrystalline and B35A250 iron core materials. The iron core loss diagram is shown when the motor is running at a speed of 10000 r / min. Detailed Implementation

[0014] The invention will now be further explained with reference to the accompanying drawings.

[0015] like Figure 1 As shown, a five-phase motor with a nanocrystalline stator core includes five stator core modules 1 and a rotor 2. The five stator core modules are evenly arranged along the circumference of the rotor 2, forming a pentagonal structure. Each stator core module 1 includes two stator tooth modules 4 and a permanent magnet 7, with the permanent magnet 7 positioned between the two stator tooth modules 4. The stator tooth modules 4 are made of nanocrystalline material and have stator slots 5, with windings 6 embedded within the slots. The surface of the rotor 2 has rotor teeth 3 evenly distributed along its circumference at an inclined angle.

[0016] Depending on the number of phases in the motor, stator gear module 4 can be either asymmetrical or symmetrical. For example... Figure 2 As shown, the stator tooth module 4 has a U-shaped structure, and the slot width x1 and depth x2 between the two teeth can be represented by formula (1) and formula (2).

[0017]

[0018]

[0019] In the above formula, L1 is the length of the stator tooth module, and L2 is the width of the stator tooth module. The stator tooth module is formed by laminating nanocrystalline alloy strips and impregnating them with acrylic resin to form a bulk core, which is then cut using electrical discharge machining.

[0020] like Figure 3 As shown, the surface of rotor 2 has a number of rotor teeth 3 evenly distributed along the circumference. The cross-section of the rotor is a fan-shaped structure, and the number of teeth x3 can be expressed by formula (3). The angle between the parallel line of the rotor teeth 3 and the parallel line of the rotor axis is θ. Due to the pentagonal structure of the stator, the circumferential distribution of the air gap between the stator and rotor is inconsistent. The problem of uneven air gap, large variation of magnetic permeability with circumferential position, and low sinusoidal degree of no-load back electromotive force caused by the pentagonal stator structure is solved by the rotor tooth skew poles. It should be noted that the number of rotor teeth 3 x3 cannot be an integer multiple of the number of motor poles.

[0021] x3 = 2p s +k (3)

[0022] In the above formula, p s Let k be the number of pole pairs of the motor, and k be an integer.

[0023] In this embodiment, the stator has a pentagonal structure, and the centerlines of adjacent stator core modules 1 differ by 72°; the rotor has a total of 12 rotor teeth, and each rotor tooth has an inclination angle θ of 12° along its axis. Figure 4 The stator teeth utilize nanocrystalline materials for the no-load back electromotive force, resulting in a harmonic distortion rate of less than 5%. For example... Figure 5 When the motor is running at 10,000 r / min, the stator core loss of the motor with stator teeth made of nanocrystalline material is 1.3 W, and the stator core loss of the motor with stator teeth made of Baosteel B35A250 material is 3.1 W. The excessive core loss leads to overheating and reduced efficiency. The stator core loss of the motor with stator teeth made of nanocrystalline material in this invention is reduced by 58%.

[0024] The nanocrystalline stator core five-phase motor of this invention solves the problem of high core loss at high speeds by designing the stator shape and applying nanocrystalline materials to the stator teeth, and also improves the safety of motor operation. Therefore, this structure motor features low loss and strong overload capacity, achieving the design requirements of a high-efficiency motor.

[0025] It should be noted that the motor of the present invention can be extended to other multiphase motors, such as six-phase or seven-phase stator modules, and can also be expanded according to the number of phases to obtain 12, 14, etc.

[0026] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A five-phase motor with a nanocrystalline stator core, characterized in that, The rotor (2) includes a rotor (2) and five stator modules (1). The five stator core modules (1) are evenly arranged along the circumference of the rotor (2) to form a pentagonal structure. Each stator module (1) includes two stator tooth modules (4) and a permanent magnet (7). The permanent magnet (7) is disposed between the two stator tooth modules (4). The stator tooth modules (4) are made of nanocrystalline material. The stator tooth modules (4) have stator slots (5) and windings (6) are embedded in the stator slots (5). The rotor (2) has rotor teeth (3) evenly distributed along the circumference.

2. The five-phase motor with nanocrystalline stator core according to claim 1, characterized in that, Depending on the number of phases of the motor, the stator gear module (4) can be either asymmetrical or symmetrical.

3. The five-phase motor with nanocrystalline stator core according to claim 1 or 2, characterized in that, The rotor teeth (3) have a fan-shaped cross-section.

4. The five-phase motor with nanocrystalline stator core according to claim 1 or 2, characterized in that, The stator tooth module (4) is formed by laminating nanocrystalline alloy strips and impregnating them with acrylic resin to form a block core, which is then cut using electrical discharge machining.

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