WO2013097766A1

WO2013097766A1 - Permanent magnet harmonic motor

Info

Publication number: WO2013097766A1
Application number: PCT/CN2012/087838
Authority: WO
Inventors: 徐国卿; 蹇林旎; 武渊源
Original assignee: 中国科学院深圳先进技术研究院
Priority date: 2011-12-29
Filing date: 2012-12-28
Publication date: 2013-07-04
Also published as: CN102570753A; AU2012361425B2; CN102570753B; AU2012361425A1

Abstract

A permanent magnet harmonic motor comprises: a rotor mechanism (1) with several permanent magnets (2) disposed thereon, a stator mechanism (3) fitted with the rotor mechanism (1), and a support mechanism (8) with a bearing assembly (10) disposed thereon. The rotor mechanism (1) is connected to the support mechanism (8) through the bearing assembly (10); magnetic regulating teeth (4) are circumferentially formed at a part of the stator mechanism (3) close to the rotor mechanism (1), and distributed windings (6) are arranged on the magnetic regulating teeth (4). The number of parts in the permanent magnet harmonic motor is reduced; the permanent magnet harmonic motor has a simpler structure, and an assembly process is simple. In addition, the weight of the whole motor is reduced, and the size of the motor is reduced, which facilitate the reduction in the unsprung mass of an electric vehicle, thereby improving the stability and riding comfort of the vehicle.

Description

Description: A permanent magnet harmonic motor TECHNICAL FIELD This invention relates to a permanent magnet harmonic motor. BACKGROUND OF THE INVENTION In order to solve the problem of energy shortage and environmental pollution in the world, electric vehicles have become a research hotspot of automobile manufacturers and research institutions with their remarkable advantages of high efficiency and low emission, especially electric vehicles with efficient and high power density hub motor drive systems. Think it is the most advanced driving method. The motor as the core component of the wheel drive car, high-performance motor determines the rapid development of electric vehicles. At present, the wheel drive electric vehicle mainly has two kinds of motor drives: an outer rotor motor and an inner rotor motor. In order to meet the actual rotational speed requirements of the wheel, the inner rotor motor needs to match a complex planetary gear reduction mechanism. The volume and weight of the entire transmission system are greatly increased, and the investment cost is correspondingly increased. In addition, noise, low efficiency, low transmission accuracy, and slow response are also disadvantages. Gearbox wear reduces system life and reliability. For the outer rotor type motor with low speed range and high torque characteristics, the actual outer speed of the compound wheel in the speed range is usually not required to match the speed reduction mechanism, and the outer rotor of the motor directly drives the wheel. Patent Document No. CN101789667A discloses an electric vehicle outer rotor composite permanent magnet brushless hub motor, which comprises an outer rotor, a support shaft connected to the outer rotor, an outer rotor yoke portion disposed on the inner wall of the outer rotor, and uniformly embedded in the circumferential direction. a permanent magnet on the outer rotor yoke, a magnetic flux ring connected to the permanent magnet and fixed on the support shaft, a stator disposed between the magnetic flux ring and the support shaft and fixed on the support shaft, a winding wound on the stator, Bearings and shafts placed on the support shaft. The motor cancels the inner rotor of the magnetic gear and the outer rotor portion of the motor, and directly uses the magnetic flux ring to modulate the magnetic field of the permanent magnet of the outer rotor of the magnetic gear and then perform energy conversion with the stator magnetic field. Although the modulating ring and the stator of the motor are relatively stationary, the number of components is large, which makes the structure of the harmonic motor more complicated, and the production process and the assembly process are complicated. Summary of the invention

Therefore, the technical problem to be solved by the present invention is to solve the problem of the number of harmonic motor components in the prior art. Description

Many technical problems with complex structures have led to a new permanent magnet i-wave motor with a small number of components and a simple structure.

In order to solve the above technical problem, a novel permanent magnet harmonic motor of the present invention includes: a rotor mechanism, the rotor mechanism is provided with a plurality of permanent magnets; a stator mechanism is engaged with the rotor mechanism; a support mechanism, the support The mechanism is provided with a bearing assembly, and the rotor mechanism is connected to the support mechanism through the bearing assembly; a part of the stator mechanism adjacent to the rotor mechanism is formed with a magnetic adjustment tooth, and the magnetic adjustment tooth is disposed on the magnetic mechanism There are distributed windings.

In the above permanent magnet harmonic motor, the stator mechanism is provided with a concentrated winding, and the concentrated winding and the distributed winding have the same pole pair number, which are equal to the pole pair number of the stator winding.

In the above permanent magnet harmonic motor, the stator mechanism is hooked with a stator slot, and the stator is divided into a plurality of stator teeth, and each of the stator teeth is provided with a plurality of magnetic teeth, and each stator tooth is provided with a stator Centralized windings.

In the above permanent magnet harmonic motor, the modulating teeth are projections formed in a circumferential direction of a portion of the stator mechanism close to the rotor mechanism and extending in a radial direction.

In the above permanent magnet harmonic motor, the number of the magnetic teeth is equal to the sum of the logarithm of the permanent magnet embedded in the rotor mechanism and the number of pole pairs of the winding of the stator mechanism.

In the above permanent magnet harmonic motor, the permanent magnet is embedded in the rotor mechanism.

In the above permanent magnet harmonic motor, the rotor mechanism is an outer rotor mechanism, and the stator mechanism is an inner stator mechanism; or the rotor mechanism is an inner rotor mechanism, and the stator mechanism is an outer stator mechanism.

In the above permanent magnet harmonic motor, the outer rotor mechanism includes an outer rotor and an end cover disposed outside the outer rotor, the end cover being coupled to the support mechanism by a bearing; the inner stator mechanism including the inner stator and the ground The shaft in which the inner stator is connected.

In the above permanent magnet harmonic motor, the permanent magnets are V-shaped and are rectangular permanent magnets, and the magnetic poles of each two adjacent V-type permanent magnets are opposite. Instruction manual

In the above permanent magnet harmonic motor, the stator mechanism and the rotor mechanism have a concentric topography, and an air gap is provided between the stator mechanism and the rotor mechanism.

In the above permanent magnet harmonic motor, an insulating magnetic non-magnetic filling member is disposed in the stator slot for spacing the distributed winding and the concentrated winding.

In the above permanent magnet harmonic motor, the permanent magnet is a neodymium iron boron permanent magnet. In the above permanent magnet harmonic motor, the stator and the rotor are each formed by stacking silicon steel sheets. In the above permanent magnet harmonic motor, the outer rotor support and the outer rotor end cover are fixed to the outer casing of the bearing mechanism. The stator is fixed to the shaft.

In the above permanent magnet harmonic motor, the support mechanism is a cylinder.

An electric vehicle having a hub drive motor, wherein the motor is any of the above-described permanent magnet harmonic motors. A wind power generator having a wind driven motor, any of the above described permanent magnetic harmonic motors. In the above wind turbine, the concentrated winding and the distributed winding are forward series or reverse series. The above technical solution of the present invention has the following advantages over the prior art:

1. The permanent magnet harmonic motor of the present invention, wherein a portion of the stator mechanism adjacent to the rotor mechanism is formed with a magnetic adjusting tooth in a circumferential direction, and the magnetic adjusting tooth is provided with a distributed winding, and the design is removed. The magnetic ring structure makes the number of internal components of the harmonic motor less, and the structure is more simple, which makes the assembly process single, and saves the independent magnetic ring structure, which reduces the weight of the whole motor and reduces the weight. The size of the motor helps to reduce the unsprung mass of the electric car, thereby improving the stability and smoothness of the car.

2. The stator mechanism is provided with a concentrated winding, and the concentrated winding is stacked with the distributed winding. This design can maintain the high torque output capability of the motor during the weak magnetic speed increase control. To meet the high speed requirements of electric vehicles on high-speed roads; and to provide greater torque output than single-set windings at low speeds, to meet the needs of electric vehicles for high torque at low speeds or climbs Description

3. The number of the magnetic adjustment teeth is equal to the sum of the number of pairs of the permanent magnets embedded in the rotor mechanism and the number of pole pairs of the windings of the stator mechanism. This design allows a certain harmonic magnetic field to be generated and the stator pair of the motor The same number of energy transfer, so that the number of magnetic poles of the motor stator is reduced, the number of slots is reduced, and the processing difficulty of the stator slots is reduced. BRIEF DESCRIPTION OF THE DRAWINGS In order to make the content of the present invention easier to understand, the present invention will be further described in detail below with reference to the accompanying drawings

Figure 1 is a structural diagram of the harmonic motor of the stator in the outer rotor;

Figure 2 is a side view of the harmonic motor of the stator in the outer rotor;

Figure 3 is a distributed winding distribution diagram;

Figure 4 is a centralized winding distribution diagram;

Figure 5 is a structural diagram of a harmonic motor of an outer stator inner rotor;

Figure 6 is a cross-sectional view of the outer stator inner rotor harmonic motor; the reference numerals in the figure are: 1-rotor mechanism, 2- permanent magnet, 3-stator mechanism, 4-modulated magnetic teeth, 5-centralized winding, 6-distributed winding, 7-insulated non-magnetic filling component, 8-support mechanism, 9-end cover, 10-axis 7 assembly, 1 1-axis;

The permanent magnet harmonic motor shown in FIG. 1 includes: a rotor mechanism 1 , wherein the rotor mechanism 1 is provided with a plurality of permanent magnets 2; the shape of the permanent magnet 2 can be many kinds, wherein a rectangular shape is preferred; There are many kinds of connection relationship between the magnet 2 and the rotor mechanism, wherein it is preferably embedded in the rotor mechanism, and the permanent magnet is not easily dropped during the high-speed rotation of the rotor; in addition, the distribution of the permanent magnet 2 There may be a plurality of ways, wherein a V-shaped distribution is preferred, and the magnetic poles of each two adjacent V-type permanent magnets 2 are opposite; the harmonic motor further includes a stator mechanism 3 that cooperates with the rotor mechanism 1 Wherein the stator mechanism 3 and the rotor mechanism 1 have an air gap; further comprising a support mechanism 8, the support mechanism Description

8 is provided with a bearing assembly 10 through which the rotor mechanism 1 is coupled to the support mechanism 8; a portion of the stator mechanism 3 adjacent to the rotor mechanism 1 is formed with a magnetic adjustment tooth 4 The distributed magnetic teeth 4 are provided with distributed windings 6. In the present embodiment, the rotor mechanism 1 is an outer rotor mechanism, and the stator mechanism 3 is an inner stator mechanism. As shown in FIG. 2, the outer rotor mechanism includes an outer rotor and an end cover 9 disposed outside the outer rotor. The end cover 9 is coupled to the support mechanism 8 through the bearing assembly 10; the support mechanism may be a cylinder The inner stator mechanism includes an inner stator and a shaft 11 coupled to the inner stator.

In order to maintain the high torque output capability of the motor during the weak magnetic speed increase control, it can meet the high speed requirement of the electric vehicle on the high speed road; and provide a larger torque output than the single set winding at low speed, satisfying the electric The requirement for large torque when the car is at low speed or climbing. A concentrated winding 5 may be provided on the stator mechanism 3, and the concentrated winding is equal to the number of pole pairs of the distributed winding, and is equal to the number of pole pairs of the stator winding. The preferred connection of the distributed winding and the concentrated winding is shown in the manner shown in Figures 3 and 4. An insulating magnetic non-magnetic filling member 7 is disposed between the distributed winding 6 and the concentrated winding 5 for spacing the distributed winding 6 and the concentrated winding 5, as shown in FIG. In order to make the structure of the magnetic adjusting teeth more compact and obtain a better magnetic adjusting effect, the tuning type is a convex portion formed in a circumferential direction of the stator mechanism close to the rotor mechanism, and extending radially. . In order to transmit the energy of a certain harmonic magnetic field generated in the same manner as the stator pole of the motor, thereby allowing the number of magnetic poles and the number of slots of the motor to be reduced, thereby reducing the processing difficulty of the stator slots, the number of the magnetic adjusting teeth is preferably It is equal to the sum of the number of pairs of the permanent magnets embedded in the rotor mechanism and the number of pole pairs of the windings of the stator mechanism.

^ is the number of pole pairs of the outer rotor permanent magnet, the number of the magnetic block, ^ is the number of winding pole pairs, ^ is the ratio of the rotor to the stator magnetic field.

Harmonic motors should meet the following basic conditions when working stably: Polar logarithmic conditions: (1) Instruction manual

_{G ==} P _s ― ⁿ s

Rotor stator magnetic field speed ratio: ^r P s ( 2 ) The pole logarithmic parameters of the motor described in this embodiment: 16 pairs of permanent magnets 2, 18 tuning teeth 4. From the above formula (1), it can be found that the number of pole pairs of the stator windings is 2, so in this embodiment, the number of pole pairs of the concentrated winding 5 and the distributed winding 6 are both pairs, as shown in FIG. 3 and FIG. Shown. From equation (2), it can be concluded that the rotor-to-stator magnetic field speed ratio = _ ⁸ , so the rotational speed of the outer rotor is only the same rotor pole number as the conventional motor rotor rotational speed ^, and the stator magnetic field rotates in the opposite direction to the rotor rotation direction. . If the power supply frequency of the electric vehicle is 50 Hz, it can be known that the rotational speed of the rotating magnetic field of the stator is 1500 rpm, and the rotational speed of the outer rotor is 187.5 rpm, which basically satisfies the speed requirement of the electric vehicle. The motor of this embodiment can be used in an electric vehicle as a hub drive motor.

It can also be used in wind turbines as a wind turbine. When used in a wind power generator, the concentrated winding and the distributed winding may be forward series or reverse series according to the magnitude of the wind speed, and the connection manner of the two types of windings may be selected by a connection selecting device. Wherein, when the wind speed is small, the forward series is selected to increase the energy output; when the wind speed is too large, the reverse series may be selected to provide the braking torque to ensure that the blade speed remains within the normal use range of the unit design.

Example 2

The permanent magnet harmonic motor shown in Figs. 5 and 6 is different from the first embodiment in that the rotor mechanism is an inner rotor mechanism and the stator mechanism is an outer stator mechanism.

Referring to Figure 6, in the present embodiment, the outer stator, the support mechanism 8 and the end cover 9 are respectively fixed to the outer casing of the bearing assembly 10. The rotor is fixed to the shaft 11, and the support mechanism may be a cylinder.

It is to be understood that the above-described embodiments are merely illustrative of the embodiments and are not intended to limit the embodiments. Other variations or variations of the various forms may be made by those skilled in the art based on the above description. There is no need and no way to exhaust all of the implementations. Obvious changes or variations resulting therefrom are still within the scope of the invention.

Claims

Claim

A permanent magnet harmonic motor, comprising: a rotor mechanism, wherein the rotor mechanism is provided with a plurality of permanent magnets;

a stator mechanism that cooperates with the rotor mechanism;

a support mechanism, the support mechanism is provided with a bearing assembly, and the rotor mechanism is connected to the support mechanism through the bearing assembly;

The stator mechanism is characterized in that a magnetic adjusting tooth is formed in a circumferential direction of a portion close to the rotor mechanism, and a distributed winding is disposed on the magnetic adjusting tooth.

2. The permanent magnet harmonic motor according to claim 1, wherein: the stator mechanism is provided with a concentrated winding, and the concentrated winding and the distributed winding have the same number of pole pairs, which are equal to The number of pole pairs of the stator windings.

3. The permanent magnet harmonic motor according to claim 1, wherein:

The modulating teeth are projections formed in a circumferential direction of the stator mechanism adjacent to the rotor mechanism and extending in a radial direction.

4. A permanent magnet harmonic motor according to any of claims 1-3, characterized in that:

The number of the magnetic teeth is equal to the sum of the number of pairs of the permanent magnets embedded in the rotor mechanism and the number of pole pairs of the windings of the stator mechanism.

5. The permanent magnet harmonic motor according to claim 4, wherein: the permanent magnet is embedded in the rotor mechanism.

6. The permanent magnet harmonic motor according to claim 5, wherein: the rotor mechanism is an outer rotor mechanism, and the stator mechanism is an inner stator mechanism;

Or, the rotor mechanism is an inner rotor mechanism, and the stator mechanism is an outer stator mechanism.

7. The permanent magnet harmonic motor according to claim 6, wherein: Claim

The outer rotor mechanism includes an outer rotor and an end cap disposed outside the outer rotor, the end cap being coupled to the support mechanism by a bearing;

The inner stator mechanism includes an inner stator and a shaft coupled to the inner stator.

8. The permanent magnet harmonic motor according to claim 7, wherein:

The permanent magnets are V-shaped and are rectangular permanent magnets, and the magnetic poles of each of the two adjacent V-type permanent magnets are opposite.

An electric vehicle having a hub drive motor, characterized in that: the motor is a permanent magnet harmonic motor according to any one of claims 1-8.

A wind power generator having a wind driven motor, characterized in that: the wind driven motor is the permanent magnet harmonic motor according to any one of claims 1-8.