CN104682660B - A magnetic gear with axial magnetic field modulation - Google Patents

Abstract

The present invention discloses a kind of axial magnetic field modulation system magnetic gear, and an adjustable magnetic ring concentric with inner and outer Rotator is respectively set at the axial two ends of inner and outer Rotator, and two adjustable magnetic rings are respectively fixedly connected on magnetic gear both sides end cap inner side；Internal rotor is by the set of permanent magnets of 2M blocks first into M=1,2,3 ..., 2M the first permanent magnet of block are along the circumferential direction brought into close contact and form ring-type together successively.The polarity of all of equal axial charging of first permanent magnet and two neighboring first permanent magnet is different；Outer rotor is by the set of permanent magnets of 2N blocks second into N=1,2,3 ..., 2N the second permanent magnet of block are along the circumferential direction brought into close contact and form ring-type together successively, and the polarity of all of equal axial charging of second permanent magnet and two adjacent permanent magnets is different；The present invention forms the axial magnetic circuit between axial both sides adjustable magnetic ring and inner and outer Rotator permanent magnet, saves the iron core on rotor, has saved permeability magnetic material, effectively reduces rotor weight, improves the dynamic property of magnetic gear.

Description

A magnetic gear with axial magnetic field modulation

technical field

The invention relates to the field of power transmission equipment manufacturing, in particular to a magnetic field modulation type magnetic gear.

Background technique

Magnetic gear is a transmission part that uses magnetic coupling force to attract and repel each other to achieve the purpose of transmission. It is called a magnetic gear only because its structure is similar to traditional gears and its transmission purpose is the same. It does not belong to traditional gears in essence.

The magnetic field modulation type magnetic gear of the existing structure is composed of three parts: an inner rotor, a magnetic modulation ring and an outer rotor. Among them, the magnetic adjustment ring is installed between the inner and outer rotors, the inner rotor includes the inner rotor core and the inner rotor permanent magnet, the outer rotor includes the outer rotor iron core and the outer rotor permanent magnet, and the permanent magnet is installed on the outer surface of the inner rotor and The inner surface of the outer rotor. The permanent magnets on the inner and outer rotors are magnetized radially and form a radial magnetic field in the magnetic circuit. The defects of this kind of magnetic gear are: the inner and outer rotors are inevitably equipped with iron cores as the magnetic circuit of the permanent magnetic field, which increases the manufacturing cost and weight of the rotor, and reduces the dynamic performance; Between the two layers of rotors, a complex structure consisting of a three-part structure consisting of a rotating outer rotor, a static magnetic adjustment ring and a rotating inner rotor and two layers of air gaps is formed from the outside to the inside, which is difficult to manufacture.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the existing magnetic field modulation type magnetic gear, to provide an axial magnetic field modulation type magnetic gear which adopts axial magnetization and forms an axial magnetic field in the magnetic circuit, and has a simple structure. Easy to manufacture, low cost and stable dynamic performance.

The technical solution adopted in the present invention is: the present invention includes an inner rotor and an outer rotor, the outer rotor is coaxially sleeved outside the inner rotor, the outer rotor and the inner rotor have the same axial length, and the two axial ends are flush, the inner, The two axial ends of the outer rotor are provided with a magnetism regulating ring coaxial with the inner and outer rotors, and there are axial air gaps between the two flux regulating rings and the axial ends of the inner and outer rotors. The magnetic adjustment rings are fixedly connected to the inside of the end covers on both sides of the magnetic gear; the inner rotor is composed of 2M first permanent magnets, M=1, 2, 3,..., and the 2M first permanent magnets are closely attached to each other along the circumferential direction Join together to form a ring. All the first permanent magnets are axially magnetized and the polarities of two adjacent first permanent magnets are different; the outer rotor is composed of 2N second permanent magnets, N=1,2,3,..., 2N first permanent magnets The two permanent magnets are closely fitted together successively along the circumferential direction to form a ring shape, all the second permanent magnets are axially magnetized, and the polarities of two adjacent permanent magnets are different.

In the present invention, a magnetic adjusting ring can be arranged at one axial end of the inner and outer rotors, and the magnetic adjusting ring is not arranged at the other end, which is an inner rotor iron core and an outer rotor iron core.

The magnetic adjusting ring is composed of M+N iron core blocks and M+N non-magnetic conductive blocks arranged alternately along the circumferential direction and closely fitted to form a ring shape.

Compared with the existing magnetic field modulation type magnetic gear, the advantages of the present invention are:

1. The present invention changes the radially magnetized permanent magnets in the inner and outer rotors of the existing magnetic field modulation magnetic gears to axial magnetization, forming a gap between the magnetic adjustment rings on both sides of the axial direction and the permanent magnets of the inner and outer rotors. The axial magnetic circuit, this structure can save the iron core on the rotor in the existing radial magnetic field modulation magnetic gear, save the magnetic permeable material, effectively reduce the weight of the rotor, and improve the dynamic performance of the magnetic gear.

2. The present invention changes the magnetic modulation ring located between the inner and outer rotors in the existing magnetic field modulation type magnetic gear into the axial ends of the inner and outer rotors, and can be integrated with the axial end cover of the magnetic gear Integrated, compared with the three-layer structure of the existing magnetic modulation magnetic gear from outside to inner rotating outer rotor, static magnetic adjusting ring and rotating inner rotor, the axial magnetic field modulation magnetic gear of the present invention is more convenient to install and easy to realize. Ease of quality assurance.

Description of drawings

Fig. 1 is the radial structure schematic diagram of a kind of axial magnetic field modulation type magnetic gear of the present invention;

Fig. 2 is a schematic diagram of the arrangement of the iron core block and the non-magnetic permeable block of the magnetic adjusting ring in Fig. 1;

Fig. 3 is a schematic diagram of the left view structure of Fig. 1;

Fig. 4 is a schematic diagram of the radial structure of the inner rotor and the outer rotor in Fig. 1;

Fig. 5 is a schematic diagram of the magnetic field circuit of the present invention;

Fig. 6 is a schematic diagram of the radial structure of the present invention when the magnetic modulation ring is installed on one side;

Fig. 7 is a right side view of the structure shown in Fig. 6 .

In the figure: 1. inner rotor; 2. outer rotor; 3. magnetic ring; 3-1. core block; 3-2. non-magnetic block; 4. magnetic ring; 2. Non-magnetic block; 5, 6. Axial air gap; 7. Radial air gap; 8. Inner rotor core; 9. Outer rotor core.

detailed description

Referring to Figures 1, 2, 3, and 4, the present invention consists of an inner rotor 1, an outer rotor 2 and two magnetizing rings 3, 4, wherein the outer rotor 2 is coaxially sleeved outside the inner rotor 1, and the outer rotor 2 and A radial air gap 7 is left between the inner rotors 1, and the radial air gap 7 is set to 4 mm. The axial length of the outer rotor 2 is consistent with that of the inner rotor 1, and the axial ends are flush. A magnetic modulation ring is provided at both ends of the outer rotor 2 and the inner rotor 1 in the axial direction, respectively a magnetic modulation ring 3 and a magnetic modulation ring 4 . The magnetic adjusting rings 3 and 4 are coaxially installed with the outer rotor 2 and the inner rotor 1, and there is an axial air gap between the magnetic adjusting rings 3 and 4 and the axial ends of the outer rotor 2 and the inner rotor 1. They are respectively: an axial air gap 5 is left between the magnetic adjusting ring 3 and the axial end of the outer rotor 2 and the inner rotor 1; Axial air gap 6. The axial air gap 5 and the axial air gap 6 are equal, and both are set to 0.5mm. Both the axial air gap 5 and the axial air gap 6 are working air gaps. The smaller the axial air gap 5 and the axial air gap 6, the greater the torque transmitted by the gear of the present invention.

The inner rotor 1 is composed of 2M permanent magnets, M=1, 2, 3, . All the first permanent magnets are axially magnetized, and the polarities of two adjacent first permanent magnets are different. The outer rotor 2 is composed of 2N pieces of second permanent magnets, N=1, 2, 3,..., 2N pieces of second permanent magnets are closely fitted together in the circumferential direction to form a ring shape, and all the second permanent magnets are axially Magnetized, and the polarities of all the two adjacent permanent magnets are different. Both the inner rotor 1 and the outer rotor 2 have no core magnetic circuit. The magnetic adjusting ring 3 is arranged alternately along the circumferential direction by the first iron core block 3-1 of the M+N block and the first non-magnetic conductive block 3-2 of the M+N block, the first iron core block 3-1 and the first non-magnetic conductive block Blocks 3-2 fit tightly together to form a ring. The magnetic ring 4 is arranged alternately along the circumferential direction by the second iron core block 4-1 of the M+N block and the second non-magnetic permeable block 4-2 of the M+N block, the second iron core block 4-1 and the second M+N block The block non-magnetic block 4-2 fits closely together to form a ring. The outer diameters of the magnetic modulation rings 3 and 4 are greater than or equal to the outer diameter of the outer rotor 2 , and the inner diameters of the magnetic modulation rings 3 and 4 are smaller than or equal to the inner diameter of the inner rotor 1 . The magnetic adjusting ring 3 and the magnetic adjusting ring 4 are directly fixedly installed on the inner sides of the corresponding end covers on both sides of the magnetic gear, and are integrated with the end covers on both sides of the magnetic gear. As shown in FIG. 3 , the present invention consists of a magnetic modulation ring 3 , an inner rotor 1 , an outer rotor 2 , and a magnetic modulation ring 4 to form a three-stage structure in the axial direction.

The first non-magnetic block 3-2 and the second non-magnetic block 4-2 are non-magnetic material blocks such as epoxy resin, and the materials of the first iron core block 3-1 and the second iron core block 4-1 can be It is a silicon steel sheet, or it can be a whole piece of electrical steel, and the material of the inner rotor 1 and the outer rotor 2 is NdFeB or the like.

Referring to Fig. 5, the magnetic field starts from the first permanent magnet axially magnetized in the inner rotor 1, enters the magnetic modulation ring 3 through the axial air gap 5, and then enters the outer rotor 2 from the magnetic modulation ring 3 through the axial air gap 5 The axially magnetized second permanent magnet then enters the magnetic adjustment ring 4 through the axial air gap 6, and then the magnetic adjustment ring 4 returns to the first permanent magnet of the inner rotor 1 through the axial air gap 6, forming a complete magnetic field circuit.

When the present invention is working, the magnetic adjusting ring 3 and the magnetic adjusting ring 4 are fixed to modulate the magnetic fields generated by the permanent magnets in the inner rotor 1 and the outer rotor 2, so as to realize the speed change of the inner rotor 1 and the outer rotor 2 , Variable torque operation. The magnetic field generated by the inner rotor 1 and the outer rotor 2 interacts in the air gap after being modulated by the magnetic modulation ring 3 and the magnetic modulation ring 4, that is, the smooth transmission of gear torque is realized.

Referring to Fig. 6 and Fig. 7, when the present invention is implemented, the magnetism regulating ring can be provided only at one end of the gear, for example, the magnetism regulating ring 3 is provided, leaving a space between the magnetism regulating ring 3 and the axial end of the inner rotor 1 and the outer rotor 2. There is an axial air gap 5. The other end is not provided with a magnetic regulating ring, and the other end without a magnetic regulating ring is an inner rotor core 8 and an outer rotor core 9 . The inner rotor permanent magnet is installed on the inner rotor core 8 axially, and the outer rotor permanent magnet is installed on the outer rotor iron core 9 axially. Wherein, the inner diameter of the magnetic regulating ring provided at one end is less than or equal to the inner diameter of the inner rotor 1, and the outer diameter of the magnetic regulating ring provided at one end is greater than or equal to the outer diameter of the outer rotor 2; the inner diameter and outer diameter of the inner rotor core 8 are equal to the inner diameter of the inner rotor 1, the inner diameter and outer diameter of the outer rotor core 9 are equal to the inner diameter and outer diameter of the outer rotor 2, and the magnetic adjusting ring is fixedly connected to the inner side of the end cover at one end of the magnetic gear. The other composition and connection modes are the same as the structure in which a magnetic adjustment ring is respectively arranged at both ends of the gear.

Claims (3)

1. a kind of axial magnetic field modulation system magnetic gear, including internal rotor（1）And outer rotor（2）, outer rotor（2）Including coaxial sleeve Rotor（1）Outward, it is characterized in that：Inner and outer Rotator（1、2）Axial length it is consistent, and axial two ends flush, in inner and outer Rotator （1、2）Axial two ends respectively set one and inner and outer Rotator（1、2）Concentric adjustable magnetic ring, two adjustable magnetic rings and inner and outer Rotator （1、2）Axial two ends between respectively leave axial air-gap, two adjustable magnetic rings are respectively fixedly connected in the end cap of magnetic gear both sides Side；Internal rotor（1）By the set of permanent magnets of 2M blocks first into M=1,2,3 ..., 2M the first permanent magnet of block are along the circumferential direction tight successively Fit together to form ring-type；The polarity of all of equal axial charging of first permanent magnet and two neighboring first permanent magnet is different； Outer rotor（2）By the set of permanent magnets of 2N blocks second into N=1,2,3 ..., 2N the second permanent magnet of block are along the circumferential direction brought into close contact successively Form ring-type together, the polarity of all of equal axial charging of second permanent magnet and two adjacent permanent magnets is different, the adjustable magnetic Ring is along the circumferential direction staggered and is brought into close contact and formed ring-type by M+N blocks iron core block and non-magnetic piece of M+N blocks.

2. axial magnetic field modulation system magnetic gear according to claim 1, it is characterized in that：The external diameter of adjustable magnetic ring is more than or equal to The external diameter of outer rotor 2, the internal diameter of the internal diameter less than or equal to internal rotor 1 of adjustable magnetic ring.

3. axial magnetic field modulation system magnetic gear according to claim 1, it is characterized in that：The axial air-gap is 0.5mm, outward The radial air gap of 4mm is left between rotor 2 and internal rotor 1.