A two-stage compound direct drive motor

Abstract

The invention discloses a two-stage composite direct-drive motor, comprising a winding assembly (1), an inner magnetic ring assembly (2), a modulation ring assembly (3), an outer magnetic ring assembly (4) and an output shaft (5), the four being coaxially sheathed together; the winding assembly (1) is located in the inner cavity of the inner magnetic ring assembly (2), and is separated from the inner magnetic ring assembly (2) by an air gap; the inner magnetic ring assembly (2) is located in the inner cavity of the modulation ring assembly (3), and is separated from the modulation ring assembly (3) by an air gap; the modulation ring assembly (3) is located in the inner cavity of the outer magnetic ring assembly (4), and is separated from the outer magnetic ring assembly (4) by an air gap; the winding assembly (1) is passed through an alternating current to generate a rotating magnetic field, and the rotating magnetic field generates a force with the inner magnetic ring assembly (2), the modulation ring assembly (3), and the outer magnetic ring assembly (4), and outputs kinetic energy via the output shaft (5). The invention has a simple structure, a small volume, can achieve low-speed output, can meet the needs of various low-speed loads, and is suitable for popularization and use.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet motors, and in particular to a composite direct drive motor which has a simple structure, a small volume and can achieve low speed and high torque output. Background Art

[0002] Permanent magnet motors are increasingly favored by users due to their high efficiency and high power factor. However, in actual industrial applications, there are a large number of application scenarios that require high torque and low speed environments, such as new energy vehicle drive systems, oil field kowtow machine oil production systems, belt conveyor systems, chain conveyor systems, wind power generation systems, etc. There are usually two solutions for these environments: Option 1: Use (permanent magnet) motor + reducer + load; Option 2: Use permanent magnet motor + load, referred to as permanent magnet direct drive. Option 1 adds a transmission link, especially the reducer link has a high failure rate. Option 2 The only way for the permanent magnet motor direct drive method to achieve low speed is to increase the number of pole pairs of the motor. The result is that the number of pole pairs is large, the motor structure is complex, the volume is large, and the cost is high; or the technology of integrating permanent magnet gears and permanent magnet motors is used, with a small number of pole pairs, but due to volume or process limitations, the speed is still high and cannot meet the requirements of low speed loads. Summary of the invention

[0003] The purpose of the present invention is to address the problems existing in the prior art and to provide a composite direct-drive motor with a simple structure, small size and the ability to achieve low-speed and high-torque output. The composite direct-drive motor can solve the defect of the existing permanent magnet motor that the speed does not match the load. On the basis of the permanent magnet composite motor, a two-stage composite direct-drive motor is proposed, which further reduces the speed of the motor, increases the transmitted torque, reduces the structural complexity, and makes industrialization possible.

[0004] The purpose of the present invention is to be solved by the following technical solutions:

[0005] A two-stage composite direct-drive motor comprises a winding assembly, an inner magnetic ring assembly, a modulation ring assembly, an outer magnetic ring assembly and an output shaft which are arranged relatively to each other, and is characterized in that: the winding assembly, the inner magnetic ring assembly, the modulation ring assembly and the outer magnetic ring assembly are coaxially sheathed together; the winding assembly is located in the inner cavity of the inner magnetic ring assembly and is separated from the inner magnetic ring assembly by an air gap; the inner magnetic ring assembly is located in the inner cavity of the modulation ring assembly and is separated from the modulation ring assembly by an air gap; the modulation ring assembly is located in the outer magnetic ring assembly The inner cavity is separated from the outer magnetic ring assembly by an air gap; the winding assembly is composed of a coil winding and an iron core, the number of pole pairs of the coil winding is p1, and the number of salient poles on the iron core is p3; the inner magnetic ring assembly is composed of an inner permanent magnetic ring and an outer permanent magnetic ring, the number of magnetic pole pairs of the inner permanent magnetic ring is p2, and the number of magnetic pole pairs of the outer permanent magnetic ring is p4; the relationship between the number of pole pairs of the coil winding p1, the number of salient poles p3 and the number of magnetic pole pairs of the inner permanent magnetic ring p2 is p1+p2=p3; the modulation ring assembly is composed of a magnetic conductive block and non-magnetic conductive blocks are arranged at intervals, the number of magnetic conductive blocks is p6; the number of magnetic pole pairs of the permanent magnet ring of the outer magnetic ring assembly is p5; the relationship between the number of magnetic pole pairs of the outer permanent magnet ring p4, the number of magnetic conductive blocks p6 in the modulation ring assembly and the number of magnetic pole pairs of the permanent magnet ring of the outer magnetic ring assembly p5 is p4+p5=p6; when alternating current is passed through the winding assembly, a rotating magnetic field will be generated, and the rotating magnetic field will be modulated by the salient poles on the iron core to generate the spatial harmonic magnetic field with the number of pole pairs of the inner permanent magnet in the inner magnetic ring assembly. The number of magnetic pole pairs of the rings matches, so that a force is generated between the winding assembly and the inner magnetic ring assembly, converting electrical energy into kinetic energy to drive the inner magnetic ring assembly to rotate; when the inner magnetic ring assembly rotates, the rotating magnetic field of the outer permanent magnetic ring is modulated by the magnetic conductive blocks on the modulation ring assembly, and the number of spatial harmonic magnetic field poles generated matches the number of magnetic pole pairs of the permanent magnetic ring of the outer magnetic ring assembly, so that a force is generated between the inner magnetic ring assembly, the modulation ring assembly and the outer magnetic ring assembly, and the kinetic energy is output through the output shaft.

[0006] The inner permanent magnet ring in the inner magnetic ring assembly is formed by 2p2 permanent magnets with N poles and S poles spaced apart and arranged uniformly circumferentially to form a magnetic ring with a magnetic pole pair number of p2; or by 4p2 permanent magnets arranged circumferentially in a Halbach array to form a magnetic ring with a magnetic pole pair number of p2.

[0007] The outer permanent magnet ring in the inner magnetic ring assembly is formed by 2p4 permanent magnets with N poles and S poles spaced apart and arranged uniformly circumferentially to form a magnetic ring with a magnetic pole pair number of p4; or by 4p4 permanent magnets arranged circumferentially in a Halbach array to form a magnetic ring with a magnetic pole pair number of p4.

[0008] The permanent magnet ring in the outer magnetic ring assembly is formed by 2p5 permanent magnets with N poles and S poles spaced apart and arranged uniformly circumferentially to form a magnetic ring with a magnetic pole pair number of p5; or by 4p5 permanent magnets arranged circumferentially in a Halbach array to form a magnetic ring with a magnetic pole pair number of p5.

[0009] The winding assembly is fixed on the first end cover via a support shaft, and the inner magnetic ring assembly is installed on the support shaft via a first bearing, so that the inner magnetic ring assembly can rotate relative to the winding assembly.

[0010] The modulation ring assembly is connected to the output shaft as a rotor. The output shaft passes outward through the second bearing embedded in the second end cover and rotates relative to the second end cover through the second bearing.

[0011] The outer magnetic ring assembly, the first end cover and the second end cover together form the outer shell of the two-stage composite direct-drive motor. The outer magnetic ring assembly is located between the first end cover and the second end cover, and the end faces of the outer magnetic ring assembly are respectively fixed on the inner wall of the end face of the first end cover and the inner wall of the end face of the second end cover.

[0012] The winding assembly can also be composed of a coil winding, a common iron core and a magnetic adjustment block, the number of pole pairs of the coil winding is p1, the number of magnetic adjustment blocks is p3, and the relationship between the number of pole pairs of the coil winding p1, the number of magnetic adjustment blocks p3 and the number of magnetic pole pairs of the inner permanent magnet ring p2 is p1+p2=p3; when alternating current is passed through the winding assembly, a rotating magnetic field will be generated, and the number of pole pairs of the spatial harmonic magnetic field generated by the modulation of the rotating magnetic field by the magnetic adjustment block matches the number of magnetic pole pairs of the inner permanent magnet ring in the inner magnetic ring assembly, so that a force is generated between the winding assembly and the inner magnetic ring assembly, and the electrical energy is converted into kinetic energy to drive the inner magnetic ring assembly to rotate; when the inner magnetic ring assembly rotates, the rotating magnetic field of the outer permanent magnet ring is modulated by the magnetic conductive blocks on the modulation ring assembly, and the number of pole pairs of the spatial harmonic magnetic field generated matches the number of magnetic pole pairs of the permanent magnet ring of the outer magnetic ring assembly, so that a force is generated between the inner magnetic ring assembly, the modulation ring assembly and the outer magnetic ring assembly, and the kinetic energy is output via the output shaft.

[0013] The magnetic adjustment blocks are evenly distributed along the circumferential direction of the common iron core, closely fit on the outer circumferential surface of the iron core, and there are gaps between adjacent magnetic adjustment blocks. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a structural schematic diagram of a first embodiment of a two-stage composite direct-drive motor of the present invention;

[0015] Attached Figure 2 For attachment Figure 1 Schematic diagram of the cross-sectional structure;

[0016] Attached Figure 3 This is a structural schematic diagram of a second embodiment of a two-stage composite direct-drive motor of the present invention;

[0017] Attached Figure 4 For attachment Figure 3 Schematic diagram of the cross-sectional structure.

[0018] Among them: 1. Winding assembly; 1-1. Coil winding; 1-2. Iron core; 1-3. Salient pole; 1-4. Ordinary iron core; 1-5. Magnetic modulation block; 2. Inner magnetic ring assembly; 2-1. Inner permanent magnetic ring; 2-2. Outer permanent magnetic ring; 3. Modulation ring assembly; 3-1. Magnetic conductive block; 3-2. Non-magnetic conductive block; 4. Outer magnetic ring assembly; 4-1. Permanent magnetic ring; 5. Output shaft; 6. Support shaft; 7. First end cover; 8. First bearing; 9. Second end cover. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] Embodiment 1

[0021] like Figure 1 , 2 As shown: A two-stage composite direct-drive motor comprises a winding assembly (1), an inner magnetic ring assembly (2), a modulation ring assembly (3), an outer magnetic ring assembly (4) and an output shaft (5) arranged relatively to each other. The winding assembly (1), the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4) are coaxially mounted together; the winding assembly (1) is located in the inner cavity of the inner magnetic ring assembly (2) and is separated from the inner magnetic ring assembly (2) by an air gap; the inner magnetic ring assembly (2) is located in the inner cavity of the modulation ring assembly (3) and is separated from the modulation ring assembly (3) by an air gap; the modulation ring assembly (3) is located in the inner cavity of the outer magnetic ring assembly (4) and is separated from the outer magnetic ring assembly (4) by an air gap. The inner magnetic ring assembly (2) is composed of an inner permanent magnetic ring (2-1) and an outer permanent magnetic ring (2-2). The inner permanent magnet ring (2-1) is formed by 18 permanent magnets with N poles and S poles spaced and arranged evenly in the circumferential direction to form a magnetic ring with a magnetic pole pair number of 9; the outer permanent magnet ring (2-2) is formed by 4 permanent magnets with N poles and S poles spaced and arranged evenly in the circumferential direction to form a magnetic ring with a magnetic pole pair number of 2. The modulation ring assembly (3) is composed of magnetic conductive blocks (3-1) and non-magnetic conductive blocks (3-2) arranged at intervals, and the number of magnetic conductive blocks (3-1) is 25. The permanent magnet ring (4-1) of the outer magnetic ring assembly (4) is formed by 46 permanent magnets with N poles and S poles spaced and arranged evenly in the circumferential direction to form a magnetic ring with a magnetic pole pair number of 23.

[0022] In the above structure, the winding assembly (1) is fixed on the first end cover (7) through the support shaft (6), and the inner magnetic ring assembly (2) is installed on the support shaft (6) through the first bearing (8), so that the inner magnetic ring assembly (2) can rotate relative to the winding assembly. The modulation ring assembly (3) is connected to the output shaft (5) as a rotor, and the output shaft passes through the second bearing (10) embedded in the second end cover (9) outwardly, and rotates relative to the second end cover through the second bearing. The outer magnetic ring assembly (4), the first end cover (7) and the second end cover (9) together constitute the outer shell of the two-stage composite direct drive motor, the outer magnetic ring assembly (4) is located between the first end cover (7) and the second end cover (9), and the end faces of the outer magnetic ring assembly (4) are respectively fixed on the inner wall of the end face of the first end cover (7) and the inner wall of the end face of the second end cover (9).

[0023] Embodiment 1

[0024] Based on the above structure, Figure 1 , 2 As shown, the winding assembly (1) is composed of a coil winding (1-1) and an iron core (1-2), the number of pole pairs of the coil winding (1-1) is 2, and the number of salient poles (1-3) on the iron core (1-2) is 11. When alternating current is passed through the winding assembly (1), a rotating magnetic field is generated. The rotating magnetic field is modulated by the salient poles (1-3) on the iron core (1-2), and the number of pole pairs of the spatial harmonic magnetic field generated thereby matches the number of pole pairs of the inner permanent magnet ring (2-1) in the inner magnetic ring assembly (2), so that a force is generated between the winding assembly (1) and the inner magnetic ring assembly (2), and the electrical energy is converted into kinetic energy to drive the inner magnetic ring assembly (2) to rotate. When the inner magnetic ring assembly (2) rotates, the rotating magnetic field of the outer permanent magnet ring (2-2) is modulated by the magnetic conductive block (3-1) on the modulation ring assembly (3), and the number of pole pairs of the spatial harmonic magnetic field generated thereby matches the number of pole pairs of the permanent magnet ring (4-1) of the outer magnetic ring assembly (4), so that a force is generated between the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4), and the kinetic energy is output via the output shaft (5).

[0025] Embodiment 2

[0026] Based on the above structure, Figure 3 , 4As shown, the winding assembly (1) is composed of a coil winding (1-1), a common iron core (1-4) and a magnetic adjustment block (1-5). The number of pole pairs of the coil winding (1-1) is 2, and the number of the magnetic adjustment blocks (1-5) is 11. When alternating current is passed through the winding assembly (1), a rotating magnetic field is generated. The rotating magnetic field is modulated by the magnetic modulation block (1-5), and the number of pole pairs of the spatial harmonic magnetic field generated thereby matches the number of pole pairs of the inner permanent magnetic ring (2-1) in the inner magnetic ring assembly (2), so that a force is generated between the winding assembly (1) and the inner magnetic ring assembly (2), and the electric energy is converted into kinetic energy to drive the inner magnetic ring assembly (2) to rotate. When the inner magnetic ring assembly (2) rotates, the rotating magnetic field of the outer permanent magnetic ring (2-2) is modulated by the magnetic conductive block (3-1) on the modulation ring assembly (3), and the number of pole pairs of the spatial harmonic magnetic field generated thereby matches the number of pole pairs of the permanent magnetic ring (4-1) of the outer magnetic ring assembly (4), so that a force is generated between the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4), and the kinetic energy is output via the output shaft (5).

[0027] The present invention coaxially mounts a winding assembly (1), an inner magnetic ring assembly (2), a modulation ring assembly (3), and an outer magnetic ring assembly (4) together, and modulates a secondary magnetic field to greatly reduce the rotation speed of the motor and simplify the mechanical structure without increasing the number of coil pole pairs. When AC is applied to the winding assembly of the motor, a rotating magnetic field is generated. For an ordinary permanent magnet motor, when the number of coil winding pole pairs is 2, the output speed is n=60f / p1=60*50 / 2r / min=1500r / min. For the two-stage composite direct-drive motor proposed in the present invention, the rotating magnetic field generated by the AC power applied to the winding assembly (1) of the motor is modulated and coupled by the magnetic field of the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4). The output speed is n=60f / p1*(p1 / p2)*(p4 / p5)=60fp4 / (p2p5). According to the number of magnetic pole pairs in the embodiment, the output speed is n=60*50*2 / (9*23)=29r / min, which is much lower than that of an ordinary permanent magnet motor, thereby achieving the output of low speed and high torque. In addition, through the flexible setting of the number of magnetic pole pairs of each assembly, the two-stage composite direct-drive motor can achieve various low-speed and high-torque outputs to meet the needs of different low-speed loads and is suitable for promotion and use.

[0028] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technologies.

Claims

1. A two-stage composite direct-drive motor, comprising a winding assembly (1), an inner magnetic ring assembly (2), a modulation ring assembly (3), an outer magnetic ring assembly (4) and an output shaft (5) arranged relatively to each other, characterized in that: The winding assembly (1), the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4) are coaxially mounted together; the winding assembly (1) is located in the inner cavity of the inner magnetic ring assembly (2) and is separated from the inner magnetic ring assembly (2) by an air gap; the inner magnetic ring assembly (2) is located in the inner cavity of the modulation ring assembly (3) and is separated from the modulation ring assembly (3) by an air gap; The modulation ring assembly (3) is located in the inner cavity of the outer magnetic ring assembly (4) and is separated from the outer magnetic ring assembly (4) by an air gap; the winding assembly (1) is composed of a coil winding (1-1) and an iron core (1-2), the number of pole pairs of the coil winding (1-1) is p1, and the number of salient poles (1-3) on the iron core (1-2) is p3; the inner magnetic ring assembly (2) is composed of an inner permanent magnetic ring (2-1) and an outer permanent magnetic ring (2-2), the number of magnetic pole pairs of the inner permanent magnetic ring (2-1) is p2, and the number of magnetic pole pairs of the outer permanent magnetic ring (2-2) is p4; the relationship between the number of pole pairs p1 of the coil winding (1-1), the number of salient poles (1-3) p3 and the number of magnetic pole pairs p2 of the inner permanent magnetic ring (2-1) is p1+p2=p3; the modulation ring The assembly (3) is composed of magnetic conductive blocks (3-1) and non-magnetic conductive blocks (3-2) arranged at intervals, and the number of magnetic conductive blocks (3-1) is p6; the number of magnetic pole pairs of the permanent magnetic ring (4-1) of the outer magnetic ring assembly (4) is p5; the relationship between the number of magnetic pole pairs p4 of the outer permanent magnetic ring (2-2), the number p6 of magnetic conductive blocks (3-1) in the modulation ring assembly (3) and the number of magnetic pole pairs p5 of the permanent magnetic ring (4-1) of the outer magnetic ring assembly (4) is p4+p5=p6; when alternating current is passed through the winding assembly (1), a rotating magnetic field is generated, and the number of pole pairs of the spatial harmonic magnetic field generated by the modulation of the salient poles (1-3) on the iron core (1-2) matches the number of magnetic pole pairs of the inner permanent magnetic ring (2-1) in the inner magnetic ring assembly (2). , so that a force is generated between the winding assembly (1) and the inner magnetic ring assembly (2), converting electrical energy into kinetic energy to drive the inner magnetic ring assembly (2) to rotate; when the inner magnetic ring assembly (2) rotates, the rotating magnetic field of the outer permanent magnetic ring (2-2) is modulated by the magnetic conductive block (3-1) on the modulation ring assembly (3), and the number of pole pairs of the spatial harmonic magnetic field generated thereby matches the number of pole pairs of the permanent magnetic ring (4-1) of the outer magnetic ring assembly (4), so that a force is generated between the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4), and the kinetic energy is output via the output shaft (5); the inner permanent magnetic ring (2-1) in the inner magnetic ring assembly (2) is arranged uniformly in the circumferential direction by 2p2 permanent magnets with N poles and S poles spaced apart. The outer ring permanent magnet ring (2-2) in the inner ring assembly (2) is formed by 2p4 permanent magnets with N poles and S poles spaced apart and arranged evenly in the circumferential direction to form a magnetic ring with a magnetic pole pair number of p4; or the outer ring permanent magnet ring (2-1) in the outer ring assembly (4) is formed by 2p5 permanent magnets with N poles and S poles spaced apart and arranged evenly in the circumferential direction to form a magnetic ring with a magnetic pole pair number of p5; or the outer ring permanent magnet ring (2-2) in the inner ring assembly (2) is formed by 2p4 permanent magnets with N poles and S poles spaced apart and arranged evenly in the circumferential direction to form a magnetic ring with a magnetic pole pair number of p4;The winding assembly (1) is composed of a coil winding (1-1), a common iron core (1-4) and a magnetic adjustment block (1-5); the number of pole pairs of the coil winding (1-1) is p1, the number of magnetic adjustment blocks (1-5) is p3, and the relationship between the number of pole pairs of the coil winding (1-1) p1, the number of magnetic adjustment blocks (1-5) p3 and the number of magnetic pole pairs of the inner permanent magnet ring (2-1) p2 is p1+p2=p3; when an alternating current is passed through the winding assembly (1), a rotating magnetic field is generated, and the number of pole pairs of the spatial harmonic magnetic field generated by the modulation of the magnetic adjustment block (1-5) is the same as that of the inner permanent magnet ring (2-1) in the inner magnetic ring assembly (2). -1) matches the number of magnetic pole pairs of the inner magnetic ring assembly (2), so that a force is generated between the winding assembly (1) and the inner magnetic ring assembly (2), converting electrical energy into kinetic energy to drive the inner magnetic ring assembly (2) to rotate; when the inner magnetic ring assembly (2) rotates, the rotating magnetic field of the outer permanent magnetic ring (2-2) is modulated by the magnetic conductive block (3-1) on the modulation ring assembly (3), and the number of pole pairs of the spatial harmonic magnetic field generated thereby matches the number of magnetic pole pairs of the permanent magnetic ring (4-1) of the outer magnetic ring assembly (4), so that a force is generated between the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4), and the kinetic energy is output via the output shaft (5). ; 2. The two-stage compound direct-drive motor according to claim 1, characterized in that: The winding assembly (1) is fixed on the first end cover (7) via a support shaft (6), and the inner magnetic ring assembly (2) is mounted on the support shaft (6) via a first bearing (8), so that the inner magnetic ring assembly (2) can rotate relative to the winding assembly.

3. The two-stage compound direct-drive motor according to claim 1, characterized in that: The modulation ring assembly (3) is connected to the output shaft (5) as a rotor. The output shaft passes outward through the second bearing (10) embedded in the second end cover (9) and rotates relative to the second end cover through the second bearing.

4. The two-stage compound direct-drive motor according to claim 1, characterized in that: The outer magnetic ring assembly (4), the first end cover (7) and the second end cover (9) together form the outer shell of the two-stage composite direct-drive motor; the outer magnetic ring assembly (4) is located between the first end cover (7) and the second end cover (9), and the end faces of both ends of the outer magnetic ring assembly (4) are respectively fixed on the inner wall of the end face of the first end cover (7) and the inner wall of the end face of the second end cover (9).

5. The two-stage compound direct-drive motor according to claim 1, characterized in that: The magnetic adjustment blocks (1-5) are evenly distributed along the circumferential direction of the common iron core (1-4), closely fitted on the outer circumferential surface of the common iron core (1-4), and there are gaps between adjacent magnetic adjustment blocks (1-5).

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