An axial flux motor rotor structure

Abstract

The utility model discloses an axial flux motor rotor structure, include: rotor yoke, magnet, epoxy resin glue. Rotor yoke and magnet are pasted through epoxy resin glue, and the rotor yoke is disc type structure, and is provided with a plurality of groups of grooves along its circumferential, is used to accommodate the magnet of matching, the outer arc pole arc coefficient of groove is 0.6 0.9, and the inner arc pole arc coefficient is 0.5 0.85. The utility model discloses a magnet split type structure design, effectively reduce magnet eddy current loss, thereby reduce motor heating. Meanwhile, the magnet is pasted on the rotor yoke slot hole with epoxy resin glue, can effectively speed up rotor magnet pasting efficiency, and reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle motor technology, and in particular to an axial flux motor rotor structure. Background Technology

[0002] The rotor of an electric motor refers to the rotating part of the motor. An electric motor consists of a stator and a rotor, and it is a device that converts electrical energy into mechanical energy. In terms of the direction of magnetic flux, electric motors are divided into radial flux motors and axial flux motors. Currently, radial flux motors are the most common type on the market, while axial flux motors are more widely used in wind power generation, new energy vehicles, and new energy motorcycles. With the development of new energy technologies, electric motors are gradually trending towards lightweight, portable, and high-performance designs. Therefore, the development of axial flux motors is particularly important, and the research and development of the stator and rotor are key to the development of axial flux motors.

[0003] Currently, austenitic stainless steel, carbon fiber, and resin are widely used materials in axial motor rotor manufacturing technology. However, these materials are difficult to manufacture, costly, and have high processing difficulty, hindering rapid prototyping and rotor lightweighting. This application, while ensuring the performance of the axial flux motor rotor magnets, reduces the manufacturing difficulty and cost of the rotor yoke by changing its material and structure, thus achieving lightweighting. The magnet structure is also modified to reduce motor heat generation. This ultimately meets the performance requirements of high-performance axial flux motors. Utility Model Content

[0004] The purpose of this invention is to provide an axial flux motor rotor structure that effectively reduces magnet eddy current losses through a split magnet structure design, thereby reducing motor heat generation.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] An axial flux motor rotor structure includes: a rotor yoke, a magnet, and epoxy resin adhesive. The rotor yoke and the magnet are bonded together with epoxy resin adhesive. The rotor yoke has a disc-shaped structure with multiple sets of grooves along its circumference to accommodate matching magnets. The outer arc polarity coefficient of the grooves is 0.6-0.9, and the inner arc polarity coefficient of the grooves is 0.5-0.85.

[0007] Furthermore, the rotor yoke material is made of 7075 aluminum alloy.

[0008] Furthermore, the magnet is made of sintered neodymium iron boron material.

[0009] Furthermore, the magnet is a set of 16 separate magnets.

[0010] Furthermore, the magnet is divided into 5 segments, with a gap of 0.1-0.2 mm between each segment.

[0011] Furthermore, the magnet has steps of 2.5mm high × 1mm wide × 25mm long on both sides.

[0012] Furthermore, the magnet is generally flat.

[0013] Furthermore, the magnet is generally tile-shaped.

[0014] Furthermore, the epoxy resin adhesive achieves a bonding strength of 26.5 MPa and a temperature resistance of 180°C.

[0015] The beneficial effects of this utility model are:

[0016] 1. The 7075 aluminum alloy rotor yoke design allows for efficient selection of the slot polar arc coefficient and pre-design of the amount of adhesive epoxy resin used.

[0017] 2. The split magnet structure design effectively reduces magnet eddy current losses, thereby reducing motor heat generation.

[0018] 3. By using epoxy resin adhesive to bond magnets to the rotor yoke slots, the bonding efficiency of rotor magnets can be effectively accelerated and costs reduced. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the rotor yoke of the axial flux motor of the present invention;

[0020] Figure 2 This is a schematic diagram of the axial direction of the magnet of the present invention;

[0021] Figure 3 This is a schematic diagram of the split magnet of the present invention;

[0022] Figure 4 This is an enlarged view of the magnet connection of the present invention;

[0023] Figure 5 This is a left view of the magnet of the present invention;

[0024] Figure 6 This is a right view of the magnet of the present invention;

[0025] Figure 7 This is a schematic diagram of the complete installation of the axial flux motor of the present invention;

[0026] In the diagram: 1: Rotor yoke groove; 2: Magnet; 3: Rotor yoke step; 4: Magnet tile gap. Detailed Implementation

[0027] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, this utility model provides an axial flux motor rotor structure, including: a rotor yoke, a magnet, and an epoxy resin adhesive.

[0030] Rotor yoke: The rotor yoke material is made of 7075 aluminum alloy, such as... Figure 2 The diagram shows a reasonable ratio of 0.6-0.9 for the outer arc of the groove and 0.5-0.85 for the inner arc, designed based on the volume of epoxy resin used in a volume of 2.5mm high × 1mm wide × 25mm long.

[0031] Magnets: The magnets are made of sintered neodymium iron boron, and there are 16 magnets in total. The magnets are divided into 5 sections, such as... Figure 4 The gap between each section of the magnetic tile shown is 0.1-0.2 (mm), as follows. Figure 5 The magnet shown has steps on both sides, each 2.5mm high × 1mm wide × 25mm long. These steps reduce motor harmonic generation and eddy current losses, thus lowering the temperature rise.

[0032] Epoxy resin adhesive: To enable rapid bonding of the magnets, epoxy resin adhesive is applied to the 16 slots of the rotor yoke. The material used is high-strength, high-temperature resistant epoxy resin, which achieves a strength of 26.5 MPa and a temperature resistance of 180℃ after bonding, meeting the requirements for magnet bonding.

[0033] The above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A rotor structure for an axial flux motor, comprising: The rotor yoke, magnet, and epoxy resin adhesive are characterized in that: the rotor yoke and the magnet are bonded together by epoxy resin adhesive; the rotor yoke has a disc-shaped structure with multiple sets of grooves arranged along its circumference to accommodate the matching magnets; the outer arc polarity coefficient of the grooves is 0.6-0.9, and the inner arc polarity coefficient of the grooves is 0.5-0.

85.

2. The rotor structure of an axial flux motor as described in claim 1, characterized in that: The rotor yoke is made of 7075 aluminum alloy.

3. The rotor structure of an axial flux motor as described in claim 1, characterized in that: The magnet is made of sintered neodymium iron boron material.

4. The rotor structure of an axial flux motor as described in claim 1, characterized in that: The magnet consists of 16 separate magnets.

5. The rotor structure of an axial flux motor as described in claim 1, characterized in that: The magnet is divided into 5 sections, with a gap of 0.1-0.2 mm between each section.

6. The rotor structure of an axial flux motor as described in claim 1, characterized in that: The magnet has steps on both sides that are 2.5mm high × 1mm wide × 25mm long.

7. The rotor structure of an axial flux motor as described in claim 1, characterized in that: The magnet is generally flat.

8. The rotor structure of an axial flux motor as described in claim 1, characterized in that: The magnet is shaped like a tile.

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