CN102563004B - A kind of magnetic gear with a new magnetic adjusting ring - Google Patents

Abstract

The invention relates to the field of manufacturing of power transmission equipment, in particular to a magnetic gear with a novel magnetic-field regulating ring, which comprises an inner rotor, an outer stator and the magnetic-field regulating ring arranged between the inner rotor and the outer stator. The magnetic gear is characterized in that the magnetic-field regulating ring is formed by laminating circular silicon steel pieces, a plurality of grooves are arranged on the periphery of the magnetic-field regulating ring axially, and non-magnetic materials are disposed in the grooves; the outer stator is provided with N1 pieces of magnetic steel, the inner rotor is provided with N2 pieces of magnetic steel, N1+N2 grooves are arranged on the magnetic-field regulating ring, N1+N2 iron core salient poles of the magnetic-field regulating ring are arranged between each two grooves, the N2 is larger than the N1, and both the N1 and the N2 are natural numbers; the non-magnetic materials in the grooves are epoxy resin or polyformaldehyde, and the magnetic-field regulating ring which is formed by laminating circular silicon steel pieces is fixedly connected to a front end plate and a rear end plate thereof through bolts penetrating in the non-magnetic materials. Compared with the prior art, the magnetic gear with the novel magnetic-field regulating ring has the substantial advantages that integral mechanical strength is increased and processing procedures are simplified due to the fact that the magnetic-field regulating ring has the integral stamped structure, and the torque ripple of the inner rotor is decreased effectively due to the design that no slots are arranged to close to air gaps of the inner rotor, which is similar to the design of closed slots of motors.

Description

A kind of magnetic gear with a new magnetic adjusting ring

technical field

The invention relates to the field of power transmission equipment manufacturing, in particular to a magnetic gear with a novel magnetic adjusting ring.

Background technique

Concentric magnetic gear is a new type of power transmission mechanism. Compared with mechanical gear, it has the following advantages: 1) It can reduce mechanical noise and vibration; 2) Magnetic gear does not need lubrication, so it can reduce maintenance and increase system reliability 3) When the load is seriously overloaded, the magnetic gear has self-protection ability; 4) The torque input and output ends are non-contact, which has great advantages in the drive of toxic and harmful fluid pumps; 5) Magnetic The gear permanent magnet is directly installed on the surface of the rotor, unlike mechanical gears, which require finishing and heat treatment processes on the teeth, the processing is more convenient than mechanical gears. Magnetic gears usually consist of three parts: an inner rotor, a magnet ring and an outer rotor. Permanent magnets are placed on the outer surface of the inner rotor and the inner surface of the outer rotor, and the magnetic modulation ring is composed of some ferromagnetic materials uniformly distributed in the circumferential direction. These iron cores play the role of modulating the internal and external magnetic fields. By adjusting the number of ferromagnets on the magnetic ring and the number of pole pairs of the inner and outer rotor magnets and adopting an appropriate ratio, the inner and outer rotors can perform stable torque transmission when they rotate at different speeds, thereby realizing the function of variable speed transmission. In addition, the magnetic gear has another kind of motion matching: that is, the outer rotor is fixed, the inner rotor is the high-speed end, and the magnetic ring is the low-speed end. But no matter what kind of motion structure, because the magnetic modulation ring undertakes the task of modulating the internal and external magnetic fields, the inner and outer sides are respectively the inner and outer air gaps, and the structure is special. It is the most critical part of the magnetic gear. Its design, manufacturing accuracy and mechanical Strength is directly related to the quality of the magnetic gear. However, the current magneto-tuning ring has the following disadvantages. The magneto-tuning ring is alternately spliced by iron core blocks and epoxy resin blocks of non-magnetic materials. The mechanical strength is insufficient, and the torque of the high-speed rotor is not stable enough.

Contents of the invention

The purpose of the present invention is to overcome the problems existing in the magnetic regulating ring of the existing concentric magnetic gear machine, and provide a magnetic gear with a new magnetic regulating ring, which can improve the mechanical strength of the magnetic regulating ring of the existing concentric magnetic gear machine. The defect that the rotor torque is not stable enough.

In order to achieve the above object, the present invention adopts the following technical solutions: a magnetic gear with a novel magnetic modulation ring, comprising an inner rotor, an outer stator, and a magnetic modulation ring positioned between the inner rotor and the outer stator, characterized in that: the magnetic modulation ring It is formed by laminating a ring-shaped silicon steel sheet material. Several grooves are opened in the axial direction on the periphery of the magnetic adjustment ring, and non-magnetic materials are placed in the grooves. It is characterized in that: the magnetic steel of the outer stator is N1 piece, the magnetic steel of the inner rotor is N2 piece, there are N1+N2 grooves on the magnetic field regulating ring, and the salient pole of the magnetic field regulating ring iron core between the two grooves has N1 +N2, N2>N1, N1 and N2 are natural numbers. It is characterized in that: the non-magnetic conductive material in the groove is epoxy resin or polyoxymethylene. It is characterized in that: the magnetism regulating ring composed of laminated annular silicon steel sheet materials is fixedly connected with the front and rear end plates of the magnetism regulating ring by screws passing through the non-magnetic material. Compared with the prior art, the present invention has the following obvious outstanding substantive features and significant advantages: Since the magnetic adjustment ring adopts the whole punch structure, the overall mechanical strength is improved, the processing steps are reduced, and the side close to the air gap of the inner rotor has no The opening, similar to the design of the closed slot in the motor, effectively reduces the torque ripple of the inner rotor.

Description of drawings

The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a transverse cross-sectional view of the magnetic modulation ring of the present invention.

Detailed ways

The figure includes an inner rotor 1, an outer stator 2, and a magnetic modulation ring 3 located between the inner rotor and the outer stator. There are several grooves 5 along the axial direction on the top, and non-magnetic conductive materials 6 are placed in the grooves. It is characterized in that: the magnetic steel 7 of the outer stator is N1 piece, the magnetic steel 8 of the inner rotor is N2 piece, there are N1+N2 grooves on the magnetic adjustment ring, and the salient poles of the iron core of the magnetic adjustment ring between the two grooves There are N1+N2 numbers of 9, N2>N1, N1 and N2 are natural numbers. It is characterized in that: the non-magnetic conductive material in the groove is epoxy resin or polyoxymethylene. It is characterized in that: the magnetic modulation ring made of laminated annular silicon steel sheet materials is fixedly connected to the front and rear end plates 11 and 12 of the magnetic modulation ring by screws 10 passing through the non-magnetic material.

A special case, N1=5, N2=24, the magnetism ring consists of N1+N2 blocks of magnetism ring iron core salient poles and N1+N2 blocks of epoxy resin in a staggered arrangement to form a ring, and the magnetism ring is axially two The front end of the magnetic ring is fixedly connected by the front end plate of the magnetic ring and the rear end plate of the magnetic ring. The front bearing on the front end plate of the magnetic ring and the rear bearing on the rear end plate of the magnetic ring are installed on the shaft of the inner rotor. The front end of the magnetic ring The extension of the plate serves as the output shaft of the magnetic ring.

The operating principle of the concentric magnetic gear of the present invention is to use the magnetic modulation ring to modulate the magnetic field generated by the magnetic steel of the inner and outer rotors, so that the modulated harmonic components of the magnetic density of the inner and outer air gaps have the same number of pole pairs. According to Maxwell's tensor theory, if the two harmonic components have the same number of magnetic pole pairs, and the spatial phase difference does not change with time, then stable torque transmission can be achieved. Therefore, according to the analysis, when the number of iron core blocks of the magnetic ring satisfies N1+N2, if the inner and outer rotors rotate in reverse according to the speed ratio of N2/N1, they can achieve stable torque transmission, and the speed ratio is N2/N1 . Since the outer magnetic steel is used as the rotor, an additional frame is required for fixed installation, so the present invention uses a fixed outer magnetic steel, and uses the magnetic adjustment ring as the outer rotor, which reduces the volume. At this time, the inner rotor and the magnetic adjustment The speed ratio of the ring is (N1+N2)/N1.

Claims (1)

1. one kind has the magnetic gear of novel adjustable magnetic ring, comprise internal rotor, external stator, be positioned at the adjustable magnetic ring between internal rotor and external stator, it is characterized in that: adjustable magnetic ring is overrided to form by an annular silicon steel material, the inner ring of adjustable magnetic ring is connected, on the periphery of adjustable magnetic ring, offer vertically some grooves, in groove, be placed with non-magnet material; The magnet steel of external stator is N1 piece, and the magnet steel of internal rotor is N2 piece, has N1+N2 bar groove on adjustable magnetic ring, and the adjustable magnetic ring iron core salient pole between two grooves has N1+N2, N2>N1, and N1 and N2 are natural number; Non-magnet material in groove is epoxy resin or polyoxymethylene; The adjustable magnetic ring that the annular silicon steel material laminating forms is fixedly connected with the forward and backward end plate of adjustable magnetic ring by the screw being through in non-magnet material.