Direct-drive motor of magnetic gear reducing mechanism

Abstract

The invention discloses a direct-drive motor of a magnetic gear reduction mechanism. The direct-drive motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a stator punching sheet, a group of stator coil groups, a group of uniformly distributed stator teeth and a group of permanent magnet groups, the plurality of groups of stator coil groups are arranged between the stator punching sheet and the stator teeth, and the permanent magnet groups are embedded in the stator teeth; and the rotor assembly comprises a rotor yoke and a rotor permanent magnet group, the rotor permanent magnet group is arranged between the rotor yoke and the stator teeth, and the rotor permanent magnet group is embedded on the rotor yoke. The invention relates to the technical field of speed reducing motors, in particular to a direct-drive motor of a magnetic gear speed reducing mechanism. The technical problem to be solved by the invention is to provide the magnetic gear reduction mechanism direct-drive motor, which is beneficial for reducing the rotating speed of the motor and improving the torque of the motor by changing the number of stator teeth.

Description

Technical Field

[0001] The present invention relates to the technical field of reduction motors, and in particular to a direct-drive motor with a magnetic gear reduction mechanism. Background Art

[0002] In industrial applications, variable speed and variable torque transmission is often required. For example, in wind power generation and hydropower generation, extremely low-speed and variable wind energy and water potential energy need to be converted into high-speed mechanical kinetic energy for power generation. In electric vehicles and submarine drives, the high-speed mechanical power of the drive motor needs to be converted into very low-speed and high-torque mechanical power.

[0003] The operating principle of a direct-drive motor is relatively simple and straightforward. It typically consists of three parts: a stator, a rotor, and a sensor (such as an encoder). The stator contains the motor's coils and core. When the coils are energized, they generate a rotating magnetic field. The rotor, consisting of magnets and copper coils, is mounted on the motor shaft. The rotating magnetic field causes the rotor's magnets to rotate due to the magnetic force. Since the rotor is mounted directly on the load, its rotation directly drives the load's rotation, achieving a direct drive effect.

[0004] Currently, there is still a lack of a direct-drive motor that uses permanent magnets on both the stator and the rotor, and changes the number of stator teeth while keeping the logarithm of the rotor stages unchanged, thereby reducing the motor's speed and increasing the motor's torque. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a direct-drive motor with a magnetic gear reduction mechanism, which is conducive to reducing the motor's rotational speed and increasing the motor's torque by changing the number of stator teeth.

[0006] The present invention adopts the following technical solutions to achieve the invention objectives: A direct-drive motor with a magnetic gear reduction mechanism is characterized in that it includes: a stator assembly and a rotor assembly; the stator assembly includes stator punchings, a group of stator coil groups, a group of evenly distributed stator teeth and a group of permanent magnet groups, the multiple groups of stator coil groups are arranged between the stator punchings and the stator teeth, and the permanent magnet groups are embedded in the stator teeth; the rotor assembly includes a rotor yoke and a group of rotor permanent magnet groups, the rotor permanent magnet groups are arranged between the rotor yoke and the stator teeth, and the rotor permanent magnet groups are embedded in the rotor yoke.

[0007] As a further limitation of this technical solution, the stator punchings are fixedly connected to the corresponding stator teeth via a set of connecting plates, each stator coil group is respectively encircled by a corresponding connecting plate, and the stator coil group includes a first stator coil, a second stator coil, and a third stator coil. When projected onto a horizontal plane, the stator coil groups are arranged as follows: first stator coil, second stator coil, third stator coil, first stator coil, second stator coil, third stator coil, and so on.

[0008] As a further limitation of this technical solution, the stator teeth are provided with symmetrical inner mounting slots, and the permanent magnet groups include a permanent magnet N and a permanent magnet S, each of which is mounted in a corresponding inner mounting slot. When projected onto a horizontal plane, the permanent magnet groups are arranged in the order of permanent magnet N, permanent magnet S, permanent magnet N, permanent magnet S, permanent magnet N, permanent magnet S, etc.

[0009] As a further limitation of the present technical solution, the rotor permanent magnet group includes a first rotor permanent magnet, a second rotor permanent magnet and a third rotor permanent magnet, the first rotor permanent magnet and the third rotor permanent magnet have the same polarity, and the first rotor permanent magnet and the second rotor permanent magnet have opposite polarity.

[0010] As a further limitation of this technical solution, the rotor permanent magnet group is a Halbach structure with a magnetic concentration angle of 45°, which has a higher magnetic concentration effect and can greatly reduce the thickness of the rotor yoke, thereby reducing the rotational inertia of the rotor assembly and improving the dynamic performance of the motor.

[0011] As a further limitation of this technical solution, different magnetic reduction ratios are achieved by combining different numbers of stator teeth with the rotor permanent magnet groups. , the specific formula is as follows: (1) in: is the number of rotor poles; is the number of stator teeth; is the number of stator teeth 3; When the number of stator teeth 3 The number of rotor poles is 27 and the number of rotor poles is 5 24 According to formula 1, It is 8, which is equivalent to an 8:1 reduction mechanism, thereby greatly improving the output torque of the motor.

[0012] Since permanent magnets are installed on both the stator teeth and the rotor yoke, this type of motor is equivalent to a surface-mounted permanent magnet motor, and there are rotating magnetic field levels. ; For the above motor, pr=3, the speed of the magnetic field under the power frequency condition is 1000rpm, after the magnetic reduction ratio is 8:1, the power frequency speed is 125rpm. For the same rotor, without the stator teeth, the power frequency speed is 250rpm, and the torque is doubled under the same power condition.

[0013] As a further limitation of the present technical solution, the rotor yoke protrudes outward to form a group of limiting rods, and the group of limiting rods and the rotor yoke form a group of mounting outer grooves, and the rotor permanent magnet group is installed in the mounting outer grooves.

[0014] Compared with related technologies, the magnetic gear reduction mechanism direct-drive motor provided by the present invention has the following beneficial effects: This patented invention differs from other permanent magnet motors in that it uses permanent magnets on both the stator teeth and the rotor yoke, further reducing the motor speed by changing the number of stator teeth while keeping the number of rotor stage logarithms unchanged. This doubles the motor torque while keeping the power constant. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 1 ; Figure 3 It is a schematic diagram of the local three-dimensional structure of the present invention Figure 2 ; Figure 4 It is a partial cross-sectional view of the present invention; Figure 5 It is a partially cut-away front view of the present invention.

[0016] Figure 6 This is the magnetic pole structure and magnetizing direction of adjacent rotor permanent magnet groups of the present invention.

[0017] Figure 7 It is the magnetizing direction of the permanent magnet group of the present invention.

[0018] In the figure: 1. Stator punching sheet, 101. Connecting sheet, 2. Stator coil group, 201. First stator coil, 202. Second stator coil, 203. Third stator coil, 3. Stator teeth, 4. Permanent magnet group, 401. Permanent magnet N, 402. Permanent magnet S, 5. Rotor permanent magnet group, 501. First rotor permanent magnet, 502. Second rotor permanent magnet, 503. Third rotor permanent magnet, 6. Rotor yoke, 601. Limit rod, 602. Install outer slot. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] Embodiment 1: A direct-drive motor with a magnetic gear reduction mechanism includes: a stator assembly and a rotor assembly; the stator assembly includes a stator punching 1, a group of stator coil groups 2, a group of evenly distributed stator teeth 3 and a group of permanent magnet groups 4, the multiple groups of stator coil groups 2 are arranged between the stator punching 1 and the stator teeth 3, and the permanent magnet group 4 is embedded in the stator teeth 3; the rotor assembly includes a rotor yoke 6 and a group of rotor permanent magnet groups 5, the rotor permanent magnet group 5 is arranged between the rotor yoke 6 and the stator teeth 3, and the rotor permanent magnet group 5 is embedded on the rotor yoke 6.

[0021] The stator punchings 1 are fixedly connected to the corresponding stator teeth 3 via a set of connecting plates 101. Each stator coil assembly 2 is respectively encircled by a corresponding connecting plate 101. The stator coil assembly 2 includes a first stator coil 201, a second stator coil 202, and a third stator coil 203. Projected onto a horizontal plane, a set of stator coil assemblies 2 are arranged as follows: first stator coil 201, second stator coil 202, third stator coil 203, first stator coil 201, second stator coil 202, third stator coil 203, and so on.

[0022] The stator teeth 3 are provided with symmetrical mounting inner slots 301. The permanent magnet group 4 includes a permanent magnet N401 and a permanent magnet S402, each mounted in a corresponding mounting inner slot 301. Projected onto a horizontal plane, the permanent magnet group 4 is arranged in the order: permanent magnet N401, permanent magnet S402, permanent magnet N401, permanent magnet S402, permanent magnet N401, permanent magnet S402, etc.

[0023] The rotor permanent magnet group 5 includes a first rotor permanent magnet 501 , a second rotor permanent magnet 502 and a third rotor permanent magnet 503 . The first rotor permanent magnet 501 and the third rotor permanent magnet 503 have the same polarity, and the first rotor permanent magnet 501 and the second rotor permanent magnet 502 have opposite polarity.

[0024] The rotor permanent magnet group 5 is a Halbach structure, with three pieces forming one pole. The magnetic pole structure and magnetization direction of two adjacent poles are as follows: Figure 6 As shown, the arrow is the magnetization direction.

[0025] Each of the stator teeth 3 is equipped with a permanent magnet N401 and a permanent magnet S402, and their arrangement and magnetization direction are as follows: Figure 7 As shown, the arrow is the magnetization direction.

[0026] The rotor permanent magnet group 5 is a Halbach structure with a magnetic focusing angle of 45°, which has a higher magnetic focusing effect and can greatly reduce the thickness of the rotor yoke 6, thereby reducing the rotational inertia of the rotor assembly and improving the dynamic performance of the motor.

[0027] Different magnetic reduction ratios can be achieved by combining different numbers of stator teeth 3 and rotor permanent magnet groups 5. , the specific formula is as follows: (1) in: is the number of rotor poles; is the number of stator teeth; is the number of stator teeth 3; When the number of stator teeth 3 The number of rotor poles is 27 and the number of rotor poles is 5 24 According to formula 1, It is 8, which is equivalent to an 8:1 reduction mechanism, thereby greatly improving the output torque of the motor.

[0028] According to the magnetic field theory of three-phase motors, the number of pairs of permanent magnets on the rotor, P, is the difference between the number of stator core teeth, Z, and the number of coil winding units, r. Specifically, P = Zr. In the illustrated structure, Z = 27 and r = 3, so P = 24, and the number of rotor poles is 24. For each motor unit, the corresponding number of rotor permanent magnet poles is 8, resulting in a magnetic reduction ratio of 8:1.

[0029] Since permanent magnets are mounted on both the stator teeth 3 and the rotor yoke 6, this type of motor is equivalent to a surface-mounted permanent magnet motor, and has a rotating magnetic field series. ; For the above motor, pr=3, the speed of the magnetic field under the power frequency condition is 1000rpm, after the magnetic reduction ratio is 8:1, the power frequency speed is 125rpm. For the same rotor, without the stator teeth 3, the power frequency speed is 250rpm, and the torque is doubled under the same power condition.

[0030] In this example, r=3, so the speed of the rotating magnetic field at an industrial frequency of 50HZ is n=60f / r=60*50 / 3=1000rpm. After a magnetic reduction ratio of 8:1, the industrial frequency speed is 125rpm. For the same rotor without the stator teeth, according to the relevant formulas of surface-mounted permanent magnet synchronous motors, the industrial frequency speed is 60f / p / 2=60*50 / 24 / 2=250rpm, and the torque is doubled under the same power conditions.

[0031] The working principle of a magnetic gear reduction mechanism direct drive motor provided by the present invention is as follows: The stator sheet 1 is installed in a suitable position within the motor, and the rotor yoke 6 is installed on the motor shaft. When the first stator coil 201, the second stator coil 202, and the third stator coil 203 of the stator coil assembly 2 are energized, the first rotor permanent magnet 501, the second rotor permanent magnet 502, and the third rotor permanent magnet 503 of the rotor permanent magnet assembly 5 are rotated by the magnetic force under the action of the rotating magnetic field, causing the rotor permanent magnet assembly 5 and the rotor yoke 6 to rotate, thereby causing the motor shaft to rotate.

[0032] Example 2: This example further elaborates on Example 1. The rotor yoke 6 protrudes outward to form a set of limiting rods 601. The limiting rods 601 and the rotor yoke 6 form a set of mounting outer grooves 602. The rotor permanent magnet group 5 is mounted in the mounting outer grooves 602. The provision of the limiting rods 601 facilitates the installation of the rotor permanent magnet group 5.

[0033] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A magnetic gear reduction mechanism direct drive motor, characterized in that: include: Stator assembly and rotor assembly; The stator assembly comprises a stator sheet (1), a group of stator coil groups (2), a group of evenly distributed stator teeth (3) and a group of permanent magnet groups (4), wherein the multiple groups of stator coil groups (2) are arranged between the stator sheet (1) and the stator teeth (3), and the permanent magnet group (4) is embedded in the stator teeth (3); The rotor assembly comprises a rotor yoke (6) and a group of rotor permanent magnet groups (5), wherein the rotor permanent magnet group (5) is arranged between the rotor yoke (6) and the stator teeth (3), and the rotor permanent magnet group (5) is embedded in the rotor yoke (6).

2. The magnetic gear reduction mechanism direct drive motor according to claim 1, characterized in that: The stator punching sheets (1) are respectively fixedly connected to the corresponding stator teeth (3) via a group of connecting sheets (101); each stator coil group (2) is respectively sleeved around the corresponding connecting sheet (101); and the stator coil group (2) comprises a first stator coil (201), a second stator coil (202) and a third stator coil (203).

3. The magnetic gear reduction mechanism direct drive motor according to claim 2, characterized in that: The stator teeth (3) are provided with symmetrical inner mounting grooves (301); the permanent magnet group (4) comprises a permanent magnet N (401) and a permanent magnet S (402); the permanent magnet N (401) and the permanent magnet S (402) are respectively mounted in corresponding inner mounting grooves (301).

4. The magnetic gear reduction mechanism direct drive motor according to claim 3 is characterized in that: The rotor permanent magnet group (5) comprises a first rotor permanent magnet (501), a second rotor permanent magnet (502) and a third rotor permanent magnet (503); the first rotor permanent magnet (501) and the third rotor permanent magnet (503) have the same polarity, and the first rotor permanent magnet (501) and the second rotor permanent magnet (502) have opposite polarities.

5. The magnetic gear reduction mechanism direct drive motor according to claim 4, characterized in that: The rotor permanent magnet group (5) is a Halbach structure with a magnetic field concentration angle of 45°, which has a higher magnetic field concentration effect and greatly reduces the thickness of the rotor yoke (6), thereby reducing the rotational inertia of the rotor assembly and improving the dynamic performance of the motor.

6. The magnetic gear reduction mechanism direct drive motor according to claim 5, characterized in that: Different magnetic reduction ratios are achieved by combining different numbers of the stator teeth (3) and the rotor permanent magnet group (5). , the specific formula is as follows: （1） in: is the number of rotor poles; is the number of stator teeth; is the number of stator teeth 3; When the number of stator teeth 3 The number of rotor poles is 27 and the number of rotor poles is 5 For 24 According to formula 1, It is 8, which is equivalent to a reduction mechanism of 8:1, thereby greatly improving the output torque of the motor.

7. The magnetic gear reduction mechanism direct drive motor according to claim 6, characterized in that: because Permanent magnets are mounted on both the stator teeth (3) and the rotor yoke (6). This type of motor is equivalent to a surface-mounted permanent magnet motor, and has a rotating magnetic field series. ; For the above motor, pr=3, the speed of the magnetic field under the power frequency condition is 1000rpm, after the magnetic reduction ratio is 8:1, the power frequency speed is 125rpm, for the same rotor, without the stator teeth (3), the power frequency speed is 250rpm, and the torque is doubled under the same power condition.

8. The magnetic gear reduction mechanism direct drive motor according to claim 1, characterized in that: The rotor yoke (6) protrudes outwards to form a group of limit rods (601), and the group of limit rods (601) and the rotor yoke (6) form a group of mounting outer grooves (602), and the rotor permanent magnet group (5) is mounted in the mounting outer grooves (602).

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