Birotor brushless motor

Abstract

The invention discloses a brushless motor with a double-sided stator. The brushless motor is composed of the stator, a main rotor, an auxiliary rotor and a fixed seat. The brushless motor is characterized in that two sides of coils of the stator are arranged equally, each group of coils is linked by a gap in the stator, the full winding directions of equal group wires are the same, adjacent groups of coils of 12 groups of combined coils are opposite in winding, the driving mode is the same as that of the brushless motor, the main rotor is combined with the auxiliary rotor, and two groups of permanent magnets are arranged equally in the same sequence in the circumferential arrangement. Adjacent permanent magnets have opposite magnetic poles. Compared with a traditional brushless motor (inner and outer rotors), the brushless motor has the advantages that the magnetic field distribution is more reasonable, the magnetic field energy can be fully and effectively utilized, the coupling of the magnetic field is tighter and the magnetic field utilization rate is high due to the combination of the double rotors, higher mechanical power can be output under the same input power, and the energy conversion efficiency of the motor is improved.

Description

Technical Field

[0001] Double-rotor brushless motor structure and driving method Background Art

[0002] As an advanced electromechanical energy conversion device, brushless motors are widely used in many fields such as industrial production, consumer electronics, transportation, aerospace, and new energy electric vehicle motors. However, with the continuous development of science and technology and the increasingly stringent requirements of various industries on motor performance, traditional brushless motors have gradually exposed a series of limitations. In terms of motor efficiency, the stator winding design of traditional brushless motors is often not optimized. For example, the distribution form and turn ratio of the winding may not make the magnetic field inside the motor most effectively utilized, resulting in a large proportion of loss in the process of converting magnetic energy into mechanical energy. At the same time, there may also be deficiencies in the material selection and magnetic circuit structure design of the stator core. For example, some cores made of ordinary silicon steel sheets will produce higher hysteresis losses and eddy current losses in a high-frequency magnetic field environment. These losses not only reduce the overall efficiency of the motor, but also cause the motor to generate too much heat during operation, further affecting the performance and service life of the motor. In summary, the many problems of traditional brushless motors in terms of efficiency, torque characteristics, heat dissipation performance and control accuracy limit their further development in some emerging fields and high-end application scenarios that require higher and more complex motor performance. Therefore, there is an urgent need for a brushless motor with innovative design and performance optimization to overcome these defects. Summary of the invention

[0003] Technical problem to be solved by the invention

[0004] Among the existing brushless motors, the traditional brushless motor has overcome the problems of brush wear and spark generation of brushless motors to a certain extent, but there are still many limitations. In terms of structure, the stator and rotor design of the traditional brushless motor is not fine enough, resulting in uneven magnetic field distribution and limited energy conversion efficiency. At the same time, the permanent magnet layout and fixing method of the rotor may also affect the torque output stability and mechanical strength of the motor.

[0005] The present invention is proposed in view of the above-mentioned existing technical problems. One of its purposes is to provide a brushless motor that can solve the problem that the stator and rotor design of traditional brushless motors are not sophisticated enough, resulting in uneven magnetic field distribution and limited energy conversion efficiency, thereby providing efficient energy conversion for new energy electric vehicles and increasing the cruising range.

[0006] Technical solutions for solving technical problems

[0007] The structure of the stator in the brushless motor is rearranged, the stator winding coils are arranged equidistantly on both sides, and the work is performed in coordination with the magnetic cylinders in the main rotor and the auxiliary rotor.

[0008] Effects of the Invention

[0009] According to the brushless motor structure of the present invention, the magnetic field distribution can be made more reasonable, and the magnetic field energy can be fully and effectively utilized, so that the magnetic field coupling is tighter and the magnetic field utilization rate is high, which helps to output greater mechanical power under the same input power and improve the energy conversion efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. 1 is a perspective view of the stator structure of the dual-stator brushless motor of the present invention.

[0012] FIG. 2 is a rear perspective view of FIG. 1 .

[0013] Figure 3 is a perspective view of the main rotor.

[0014] FIG4 is a perspective view of the auxiliary rotor.

[0015] Figure 5 is a stereoscopic view of the overall assembly.

[0016] The following is a detailed description of the embodiments of the dual-stator brushless motor according to the present invention based on the accompanying drawings.

[0017] Winding material

[0018] Copper enameled wire is used as the wrapping wire for winding coils to prevent short circuits and arcs. Enameled wire can protect the wire from mechanical damage and environmental influences.

[0019] Stator components

[0020] The structural model features of the dual-stator brushless motor are as follows: the stator core is made of electrical steel / amorphous alloy and has the characteristics of high magnetic permeability, low hysteresis loss and low eddy current loss, which helps to improve the efficiency of the motor and reduce the operating noise. The winding slot is insulated. The stator support column 14, the end of which is connected to the base 24 by bolts, the inner diameters of the connection 5 and 10 are consistent, and the opening of the same circumferential array at the tail of the support column is shown in Figure 2, and there are threads matching the bolts. The support column 14 contains the support column 12, and its head is fixedly connected to the stator.

[0021] Rotor assembly

[0022] It includes the main rotor (Figure 3) and the auxiliary rotor (Figure 4). The material is cast from aluminum alloy, etc. It is characterized by light weight and good heat dissipation performance. It can effectively help the motor dissipate heat, provide better protection for the internal components of the motor, and withstand certain external force impact and vibration. The main rotor axis 16 can pass through the stator 12 and has a reserved length to be fixed by the ring buckle, and there is an appropriate gap between the rotor axis and the stator support column 12 for bearing fixation. The bottom surface of the main rotor is a magnetic cylinder. The permanent magnet uses neodymium iron boron magnets, which can provide a strong magnetic field for the brushless motor, so that the motor has higher power and efficiency. The permanent magnet is in a half-sector shape 15 and is arranged in a circle around the bottom of the rotor, providing a stable magnetic field in the brushless motor. The number of permanent magnets is in a specific proportional relationship with the number of stator slots, and can interact with the magnetic field generated by the current passing through the stator winding. According to the principle of electromagnetic induction, torque is generated to rotate the rotor. And the side of the main rotor can have a heat dissipation gap within the power output bearing range. The stator power output shaft is 22. The auxiliary rotor Figure 4 has a magnetic cylinder corresponding to the main rotor, and the permanent magnets are arranged face to face. The main rotor and the auxiliary rotor are connected by bolts 17, 22, or other stable and reliable methods. The internal space is sufficient to accommodate the stator, and there is an appropriate gap for magnetic field interaction. DETAILED DESCRIPTION

[0024] As shown in Figure 1 / 2, the stator slots are composed of 24 groups of coils. Winding 3 corresponds to winding 4 to form winding slots. Coil 3 and coil 4 in each slot are connected by a reserved gap 1 between the stators to form a 1-slot stator with a total of 12 slots. The two groups of coils in the slots have the same winding direction and the magnetic pole outputs are only N and S. After that, it is the same as the existing 12-slot brushless motor winding mode. The coils in each slot are connected according to the connection method of the three-phase motor (such as star or triangle) to ensure that the wires are arranged neatly and tightly from left to right in the slot without crossing.

[0025] One of the three-phase wires passes through the reserved wire hole 13 along the surface of the support column 14 in the stator, and the wire holes are arranged at equal distances on the support column.

[0026] Furthermore, the three-phase line is led out from the gap 11 between the two support columns [inside 12 and outside 14].

[0027] The main rotor axis 16 passes through the inner support column 12 and is connected by two bearings. The two bearings are fixed at the head and tail ends inside the inner support column 12 to ensure that the main rotor rotates outward smoothly. The main rotor axis is slightly longer than the inner support column. The purpose is to fix the tail of the axis with a semi-annular metal sheet to ensure that the outer rotor does not fall off the stator.

[0028] The auxiliary rotor is connected to the main rotor 21 by bolts to ensure that it does not loosen or become inconsistent under the interaction with the magnetic poles, and the center of the auxiliary rotor has no conflict with the stator support column, and the center is fixed by a bearing connection or not.

[0029] The permanent magnet arrays in the main and auxiliary rotors maintain a certain gap with the stator magnetic conductive sheets, so that the mutual induction loss between the magnetic poles is minimized.

[0030] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A dual-rotor brushless motor, characterized in that: It comprises the stator, an upper support column (14) located outside the stator, an inner support column (12) located inside the outer support column (14), a threading hole (13) located on the side of the outer support column (14) close to the rotor surface, a wire slot (3) (4) arranged symmetrically on both sides of the stator surface, a magnetic conductive sheet (7) (8) located on the symmetrical wire slot, it comprises the main stator (16), a plurality of permanent magnets (15) distributed and fixed on the main stator, and a fastening hole (17) distributed on the main stator, it comprises an auxiliary stator (20), a plurality of permanent magnets (19) distributed and fixed on the auxiliary stator, and a plurality of fixing holes (18) distributed on the auxiliary stator; the main and auxiliary rotors have the same maximum diameter and the same arrangement of the permanent magnets.

2. The dual-rotor brushless motor according to claim 1, characterized in that: The wire slots on the stator surface such as (3) and (4) are distributed on both sides of the stator surface, and multiple wire slots are arranged along the circumference of the rotor and are symmetrical on the stator surface.

3. The dual-rotor brushless motor according to claim 1, characterized in that: There is a gap (10) between the center of the stator surface and the proximal end of the slot.

4. The dual-rotor brushless motor according to claim 1, characterized in that: The coils on the symmetrical slots are connected via gaps (10) on the stator surface.

5. The dual-rotor brushless motor according to claim 1, characterized in that: The outer support column (11) has three threading holes (13) on the side close to the rotor surface.

6. The dual-rotor brushless motor according to claim 1, characterized in that: The structure of the inner support column (12) and the outer support column (11) at the center of the stator has a gap therein for the three-phase lines to be led out.

7. The dual-rotor brushless motor according to claim 1, characterized in that: The main rotor is fixedly connected to the auxiliary rotor.

8. The dual-rotor brushless motor according to claim 1, characterized in that: The main rotor is connected to the auxiliary rotor, and the permanent magnets on both sides of the rotor are arranged equidistantly.

9. The dual-rotor brushless motor according to claim 1, characterized in that: The auxiliary rotor is connected to the outer support column (14) by bearings.

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