CN111668950A - A two-stage compound direct drive motor - Google Patents

Abstract

The invention discloses a two-stage compound 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 are coaxially sleeved 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 The component (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 connected to alternating current to generate a rotating magnetic field, and the rotating magnetic field is connected to the inner magnetic ring assembly (2), the modulation ring assembly (3), the outer The magnetic ring assembly (4) generates a force, and the kinetic energy is output through the output shaft (5). The invention has simple structure and small volume, can realize low-speed output, can meet the requirements of various low-speed loads, and is suitable for popularization and use.

Description

A two-stage compound direct drive motor

technical field

The invention relates to the technical field of permanent magnet motors, in particular to a compound direct drive motor with simple structure, small volume and capable of realizing low-speed and high-torque output.

Background technique

Permanent magnet motors are increasingly favored by users due to their high efficiency and high power factor, but there are a large number of application scenarios in practical industrial applications that require high torque and low speed environments, such as new energy vehicle drive systems, oil field kowtow machine oil extraction systems , belt conveyor system, chain conveyor system, wind power generation system, etc.; there are usually two solutions for these environments: solution 1: use (permanent magnet) motor + reducer + load; solution 2: use permanent magnet motor + load Referred to as permanent magnet direct drive. Scheme 1 increases the transmission link, especially the reducer link has a high failure rate. Option 2 The only way for the direct drive mode of permanent magnet motor for 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 permanent magnet gear and permanent magnet The magneto integrated technology has a small number of pole pairs, but due to volume or process constraints, the speed is still high, which cannot meet the requirements of low-speed loads.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems existing in the prior art, and to provide a composite direct-drive motor with a simple structure, small volume, and low-speed and high-torque output, which can solve the problem of the speed and load of the existing permanent magnet motor. Due to the defect of mismatch, a two-stage composite direct drive motor is proposed on the basis of the permanent magnet composite motor, which further reduces the speed of the motor, increases the transmission torque, reduces the structural complexity, and makes industrialization possible.

The purpose of this invention is to solve by the following technical solutions:

A two-stage compound direct drive motor, comprising a winding assembly, an inner magnetic ring assembly, a modulation ring assembly, an outer magnetic ring assembly and an output shaft arranged oppositely, characterized in that: the winding assembly, the inner magnetic ring assembly , the modulation ring assembly and the outer magnetic ring assembly are coaxially sleeved 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 It 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 inner cavity of the outer magnetic ring assembly and is separated from the outer magnetic ring assembly by an air gap; the winding assembly is It consists of coil windings and iron cores, the number of pole pairs of the coil windings is p ₁ , and the number of salient poles on the iron core is p ₃ ; the inner magnetic ring assembly is composed of an inner permanent magnet ring and an outer permanent magnet ring, The number of pole pairs of the permanent magnet ring is p ₂ , the number _of pole pairs of the outer permanent magnet ring is _{p 4 ;} The relationship is p ₁ +p ₂ =p ₃ ; the modulation ring assembly is composed of magnetic conductive blocks and non-magnetic conductive blocks arranged at intervals, and the number of magnetic conductive blocks is p ₆ ; the number of pole pairs of the permanent magnet ring of the outer magnetic ring assembly is p ₅ ; The relationship between the number of pole pairs p ₄ of the outer ring permanent magnet ring, the number p ₆ of magnetic conductive blocks in the modulation ring assembly and the number p ₅ of the number of pole pairs of the permanent magnet ring of the outer magnetic ring assembly is p ₄ +p ₅ =p ₆ ; when the winding assembly is connected to alternating current, a rotating magnetic field will be generated, and the rotating magnetic field will be modulated by the salient poles on the iron core and the number of pole pairs of the space harmonic magnetic field generated is related to the inner permanent magnet ring in the inner magnetic ring assembly The number of pairs of magnetic poles is matched, 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 outer permanent magnet ring The rotating magnetic field is modulated by the magnetic conductive block on the modulation ring assembly, and the number of pole pairs of the space harmonic magnetic field generated matches the number of pole pairs of the permanent magnetic ring of the outer magnetic ring assembly, so that the inner magnetic ring assembly, the modulation ring A force is generated between the assembly and the outer magnetic ring assembly, and the kinetic energy is output through the output shaft.

The inner ring permanent magnet ring in the inner magnetic ring assembly is formed by 2p ₂ permanent magnets N pole and S pole spaced apart and evenly arranged in the circumferential direction to form a magnetic ring with the number of magnetic pole pairs p ₂ ; or by 4p ₂ permanent magnets using The Halbeck array is arranged circumferentially to form a magnetic ring with a pole pair number p ₂ .

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

The permanent magnet ring in the outer magnetic ring assembly is formed by 2p ₅ permanent magnets N and S poles spaced apart and uniformly arranged in the circumferential direction to form a magnetic ring with a magnetic pole pair number of p _{5 ; The} array is arranged circumferentially to form a magnetic ring with a pole pair number of p5.

The winding assembly is fixed on the first end cover through the support shaft, and the inner magnetic ring assembly is mounted on the support shaft through the first bearing, so that the inner magnetic ring assembly can rotate relative to the winding assembly.

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

The outer magnetic ring assembly, the first end cover and the second end cover are enclosed to form the casing of the two-stage composite direct drive motor, and the outer magnetic ring assembly is located between the first end cover and the second end cover And the end surfaces of both ends of the outer magnetic ring assembly are respectively fixed on the end surface inner wall of the first end cover and the end surface inner wall of the second end cover.

The winding assembly can also be composed _of a coil winding, _a common iron core and _a magnetic adjustment block. The relationship between the number p ₃ and the number of pole pairs p ₂ of the inner permanent magnet ring is p ₁ +p ₂ =p ₃ ; when the winding assembly is energized with alternating current, a rotating magnetic field will be generated, and the rotating magnetic field will be modulated by the magnetizing block to generate The number of pole pairs of the space harmonic magnetic field matches the number of 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. The magnetic ring assembly rotates; when the inner magnetic ring assembly rotates, the rotating magnetic field of the outer permanent magnet ring is modulated by the magnetic conductive block on the modulation ring assembly, and the number of space harmonic magnetic field pole pairs generated is the same as the total number of the outer magnetic ring. The number of pole pairs of the formed permanent magnet ring is matched, 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.

The magnetization blocks are evenly distributed along the circumference of the common iron core, are closely attached to the outer circumferential surface of the iron core, and have gaps between adjacent magnetization blocks.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of the two-stage composite direct drive motor of the present invention;

Accompanying drawing 2 is the cross-sectional structure schematic diagram of accompanying drawing 1;

3 is a schematic structural diagram of Embodiment 2 of the two-stage composite direct-drive motor of the present invention;

FIG. 4 is a schematic cross-sectional structure diagram of FIG. 3 .

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 adjustment block; 2, inner magnetic ring Assembly; 2-1, inner permanent magnet ring; 2-2, outer permanent magnet ring; 3, modulation ring assembly; 3-1, magnetic conductive block; 3-2, non-magnetic conductive block; 4, outer Magnetic ring assembly; 4-1, permanent magnet ring; 5, output shaft; 6, support shaft; 7, first end cover; 8, first bearing; 9, second end cover.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and embodiments.

Example 1

As shown in Figures 1 and 2: a two-stage compound direct drive motor, comprising a winding assembly (1), an inner magnetic ring assembly (2), a modulation ring assembly (3), and an outer magnetic ring assembly that are arranged oppositely (4) and output shaft (5). The winding assembly (1), the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4) are coaxially sleeved together; the winding assembly (1) is located in the inner magnetic ring The assembly (2) is in the inner cavity, 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 (2). The component (3) is separated 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 magnet ring (2-1) and an outer permanent magnet ring (2-2). The inner permanent magnet ring (2-1) forms a magnetic ring with 9 magnetic pole pairs through 18 permanent magnets N and S poles spaced apart and evenly arranged in the circumferential direction; the outer permanent permanent magnet ring (2-2) passes through 4 permanent magnets. The N and S poles of the magnets are spaced apart and uniformly arranged in the circumferential direction to form a magnetic ring with two pole pairs. 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 pieces of permanent magnets with N poles and S poles spaced apart and uniformly arranged in the circumferential direction to form a magnetic ring with 23 pole pairs.

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 with 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 passes through the second bearing opposite the second end Cover turns. The outer magnetic ring assembly (4), the first end cover (7) and the second end cover (9) form a casing of the two-stage composite direct drive motor, and the outer magnetic ring assembly (4) is located at the first end cover ( 7) and the second end cover (9) and the two end faces of the outer magnetic ring assembly (4) are respectively fixed on the end face inner wall of the first end cover (7) and the end face inner wall of the second end cover (9) superior.

Example 1

On the basis of the above structure, as shown in Figures 1 and 2, the winding assembly (1) is composed of a coil winding (1-1) and an iron core (1-2), and the number of pole pairs of the coil winding (1-1) is 2. The number of salient poles (1-3) on the iron core (1-2) is 11. When the winding assembly (1) is connected to alternating current, a rotating magnetic field will be generated, and the rotating magnetic field will be modulated by the salient poles (1-3) on the iron core (1-2), thereby generating the number of space harmonic magnetic field pole pairs and the internal magnetic field. The magnetic pole pairs of the inner permanent magnet ring (2-1) in the ring assembly (2) are matched, 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 The kinetic energy drives 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 on the ring assembly (3). (3-1) The number of pole pairs of the space harmonic magnetic field modulated and then generated matches the number of pole pairs of the permanent magnet ring (4-1) of the outer magnetic ring assembly (4), so that the inner magnetic ring assembly (2) , A force is generated between the modulation ring assembly (3) and the outer magnetic ring assembly (4), and the kinetic energy is output through the output shaft (5).

Embodiment 2

On the basis of the above structure, as shown in Figures 3 and 4, the winding assembly (1) is composed of a coil winding (1-1), an ordinary iron core (1-4) and a magnetic control block (1-5). The number of pole pairs of the winding (1-1) is 2, and the number of the magnetic adjustment blocks (1-5) is 11. When the winding assembly (1) is energized with alternating current, a rotating magnetic field will be generated, and the rotating magnetic field will be modulated by the magnetic adjustment block (1-5) to generate the space harmonic magnetic field pole pairs. The magnetic pole pairs of the permanent magnet ring (2-1) are matched, 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) Rotation; 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 then The number of pole pairs of the generated space harmonic magnetic field matches the number of pole pairs of the permanent magnet ring (4-1) of the outer magnetic ring assembly (4), so that the inner magnetic ring assembly (2) and the modulation ring assembly (3) A force is generated between the outer magnetic ring assembly (4), and the kinetic energy is output through the output shaft (5).

In the present invention, the winding assembly (1), the inner magnetic ring assembly (2), the modulation ring assembly (3), and the outer magnetic ring assembly (4) are coaxially assembled together, and the modulation of the second magnetic field is achieved. , On the basis of not increasing the number of coil pole pairs, the speed of the motor is greatly reduced and the mechanical structure is simplified. When the winding assembly of the motor is connected to alternating current, a rotating magnetic field will be generated. For a common permanent magnet motor, when the number of pole pairs of the coil winding is 2, the output speed is n=60f/p ₁ =60*50/2r/min= 1500r/min; for the two-stage composite direct drive motor proposed by the present invention, the rotating magnetic field generated by the alternating current is passed through the winding assembly (1) of the motor, and passes through the inner magnetic ring assembly (2), the modulation ring assembly (3), the outer Magnetic ring assembly (4) After the magnetic field modulation and coupling, the output speed is n=60f/p ₁ *(p ₁ /p ₂ )*(p ₄ /p ₅ )=60fp ₄ /(p ₂ p ₅ ) , according to the calculation of the number of pole pairs in the embodiment, the output speed n=60*50*2/(9*23)=29r/min, the speed is far lower than the speed of the ordinary permanent magnet motor, and the low speed and high torque is realized. output. In addition, through the flexible setting of the number of magnetic pole pairs of each assembly, the two-stage compound 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 popularization and use.

The above embodiments are only to illustrate the technical idea of the present invention, and cannot limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the present invention. The technology not involved in the present invention can be realized by the existing technology.

Claims (9)

1. A two-stage compound 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 arranged oppositely (5), which is 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 sleeved together; The component (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 modulation ring assembly (3) In the cavity, and 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 air The gap is separated; 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 p ₁ , and the The number of salient poles (1-3) is p ₃ ; the inner magnetic ring assembly (2) is composed of an inner permanent magnet ring (2-1) and an outer permanent permanent magnet ring (2-2). The number of pole pairs of (2-1) is p ₂ , the number of pole pairs of the outer permanent magnet ring (2-2) is p ₄ ; the number of pole pairs p ₁ of the coil winding (1-1), the salient poles (1-3 ) The relationship between the number p ₃ and the number p ₂ of the magnetic pole pairs of the inner permanent magnet ring (2-1) is p ₁ +p ₂ =p ₃ ; the modulation ring assembly (3) is composed of the magnetic conductive block (3-1) and The non-magnetic conductive blocks (3-2) are arranged at intervals, and the number of magnetic conductive blocks (3-1) is p ₆ ; the number of magnetic pole pairs of the permanent magnet ring (4-1) of the outer magnetic ring assembly (4) is p ₅ ; The number of pole pairs p ₄ of the outer permanent magnet ring (2-2), the number p ₆ of the magnetic conductive blocks (3-1) in the modulation ring assembly (3), and the permanent magnet ring ( 4-1) The relationship between the number of magnetic pole pairs p ₅ is p ₄ +p ₅ =p ₆ ; when the winding assembly (1) is connected to alternating current, a rotating magnetic field will be generated, and the rotating magnetic field will be absorbed by the iron core (1-2). The number of pole pairs of the space harmonic magnetic field modulated by the salient poles (1-3) and thus generated matches the number of pole pairs of the inner permanent magnet ring (2-1) in the inner magnetic ring assembly (2), so that the total number of windings A force is generated between the component (1) and the inner magnetic ring assembly (2), which converts electrical energy into kinetic energy to drive the inner magnetic ring assembly (2) to rotate; when the inner magnetic ring assembly (2) rotates, the outer ring is permanently The rotating magnetic field of the magnetic ring (2-2) is modulated by the magnetic permeable block (3-1) on the modulation ring assembly (3), and the number of pole pairs of the space harmonic magnetic field generated is the same as that of the outer magnetic ring assembly (4). The number of pole pairs of the permanent magnet ring (4-1) is matched, 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 output shaft (5) The kinetic energy is output. 2. The two-stage compound direct drive motor according to claim 1, characterized in that: the inner permanent magnet ring (2-1) in the inner magnetic ring assembly (2) passes through 2p ₂ permanent magnets N The poles and the S poles are spaced apart and uniformly arranged in the circumferential direction to form a magnetic ring with the number of pole pairs p ₂ ; or through 4p ₂ permanent magnets, a Halbeck array is arranged circumferentially to form a magnetic ring with the number of magnetic pole pairs p ₂ . 3. The two-stage compound direct drive motor according to claim 1, characterized in that: the outer permanent magnet ring (2-2) in the inner magnetic ring assembly (2) passes through _2p4 permanent magnets N The poles and the S poles are spaced apart and uniformly arranged in the circumferential direction to form a magnetic ring with the number of pole pairs p ₄ ; or through 4p ₄ permanent magnets, a Halbeck array is arranged circumferentially to form a magnetic ring with the number of magnetic pole pairs p ₄ . 4. The two-stage compound direct drive motor according to claim 1, characterized in that: the permanent magnet ring (4-1) in the outer magnetic ring assembly (4) passes through 2p ₅ permanent magnet N poles and The S poles are spaced apart and evenly arranged in the circumferential direction to form a magnetic ring with a pole pair number of p ₅ ; or by using 4p ₅ permanent magnets to use a Halbeck array circumferentially arranged to form a magnetic pole pair number p _5. The magnetic ring. 5. The two-stage compound direct drive motor according to claim 1, wherein the winding assembly (1) is fixed on the first end cover (7) through the support shaft (6), and the inner magnetic ring is assembled The assembly (2) is mounted 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. 6 . The two-stage compound direct drive motor according to claim 1 , wherein the modulation ring assembly ( 3 ) is connected to the output shaft ( 5 ) as a rotor, and the output shaft passes through the second end cover outward. 7 . (9) A second bearing (10) embedded therein, and rotated relative to the second end cover through the second bearing. 7 . The two-stage compound direct drive motor according to claim 1 , wherein the outer magnetic ring assembly ( 4 ), the first end cover ( 7 ) and the second end cover ( 9 ) are enclosed to form the The casing of the two-stage compound direct drive motor, the outer magnetic ring assembly (4) is located between the first end cover (7) and the second end cover (9) and at both ends of the outer magnetic ring assembly (4) The end surfaces are respectively fixed on the inner wall of the end surface of the first end cover (7) and the inner wall of the end surface of the second end cover (9). 8. The two-stage compound direct drive motor according to claim 1, characterized in that: the winding assembly (1) can also be composed of a coil winding (1-1), a common iron core (1-4) and a The magnetic blocks (1-5) are formed, the number of pole pairs of the coil winding (1-1) is p ₁ , the number of the magnetic adjustment blocks (1-5) is p ₃ , and the number of pole pairs of the coil winding (1-1) is p ₁ , The relationship between the number p ₃ of the magnetizing blocks (1-5) and the number of pole pairs p ₂ of the inner permanent magnet ring (2-1) is p ₁ +p ₂ =p ₃ ; when the winding assembly (1) is connected to alternating current A rotating magnetic field will be generated, and the rotating magnetic field is modulated by the magnetic modulation block (1-5). The number of pole pairs is matched, 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; (2) During rotation, 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 generated space harmonic magnetic field is equal to The number of pole pairs of the permanent magnet ring (4-1) of the outer magnetic ring assembly (4) is matched, so that the inner magnetic ring assembly (2), the modulation ring assembly (3) and the outer magnetic ring assembly (4) A force is generated between them, and the kinetic energy is output through the output shaft (5). 9. The winding assembly according to claim 8, characterized in that: the magnetization blocks (1-5) are evenly distributed along the circumferential direction of the common iron core (1-4), and are closely attached to the iron core (1-4). -4) on the outer circumference, and there is a gap between the adjacent magnetic control blocks (1-5).

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