CN211579836U - Brushless dual-rotor composite motor structure - Google Patents

Abstract

The utility model relates to the technical field of motors, and discloses a brushless dual-rotor composite motor structure. Inner motor assembly consisting of rotor, inner stator (inner stator core unit and inner stator winding); and outer motor assembly consisting of outer stator (outer stator winding, outer stator core unit, outer stator permanent magnet) and outer rotor; modulating rotor It is connected with the input shaft and rotates with it. The inner and outer rotors are rigidly connected with the output shaft and rotate together with the output shaft. The inner and outer stators are separated by stator magnetic isolation and fixed on the motor casing. Compared with the prior art, the utility model can be applied to the field of hybrid electric vehicles, can realize the brushless operation of the dual-rotor motor, has reliable operation, and can meet the power requirements of different working conditions through the control of the inner and outer motors.

Description

A brushless dual-rotor composite motor structure

technical field

The utility model belongs to the field of motor design, in particular to a brushless double-rotor composite motor structure applied to a hybrid vehicle.

Background technique

With the development of Hybrid Electric Vehicle (HEV), an electromagnetic drive hybrid system using a dual-rotor drive motor has been proposed and attracted attention. Compared with the traditional vehicle drive system, the electromagnetic drive hybrid system can achieve high efficiency. Compared with the mechanical transmission hybrid system using planetary gears, the electromagnetic transmission hybrid system has a compact structure, and the dual-rotor drive motor can replace the starter/generator and electric motor. To realize the coupling and distribution of hybrid power, this system has become one of the development directions of hybrid power system.

The dual-rotor motor structure proposed in Chinese Invention Patent Application Nos. 201310412708.3 and 201510755061.3 consists of two internal and external motors that are radially integrated in the order of "outer stator-intermediate rotor-inner rotor-rotating shaft", and the inner rotor and outer stator are provided with There are windings to form dual electrical channels of the dual rotor motor; the inner rotor is connected to the engine, the intermediate rotor is connected to the load, the inner rotor and the intermediate rotor form the dual mechanical channels of the dual rotor motor, and the dual electrical channels and dual mechanical channels form a four-port motor structure . Applied to the hybrid system, the dual-rotor motor can realize the energy distribution and coupling between the mechanical energy output by the engine and the electrical energy output by the energy storage device under different working conditions through the speed regulation of the internal motor and the torque regulation of the external motor, thereby improving the efficiency of the engine and the motor. While improving the operating efficiency of the system, it also reduces fuel consumption and realizes energy saving and emission reduction. However, since the inner rotor of the dual-rotor motor is always in a rotating state, the current connected to the windings on the inner rotor needs to be transmitted through the brushes, and the rotation speed of the inner rotor in the hybrid system is usually large, and the dust and sparks brought by the brushes It brings a great safety hazard to the system operation, so the brushless dual-rotor motor has become a hot research topic at present.

SUMMARY OF THE INVENTION

Purpose of the invention: In view of the problems existing in the prior art, the utility model proposes a brushless dual-rotor motor structure for hybrid electric vehicles, which overcomes the insufficient operating efficiency, low reliability and heavy maintenance workload of the brushed dual-rotor motor. The problem.

Technical scheme: The utility model provides a brushless dual-rotor composite motor structure, including an input shaft, an output shaft coaxially arranged with the input shaft, an inner rotor core unit surrounding the output shaft, and an inner rotor permanent core unit surrounding the inner rotor core unit. Magnets, modulating rotor surrounding inner rotor permanent magnets, inner stator core unit surrounding modulating rotor, stator magnetic isolation surrounding inner stator core unit, outer stator core unit surrounding stator magnetic isolation, outer stator permanent magnet surrounding outer stator core unit , the outer rotor 7 surrounding the outer stator permanent magnet;

Air gaps are provided between the inner rotor permanent magnet and the modulating rotor, between the modulating rotor and the inner stator core unit, between the outer stator core unit and the outer stator permanent magnet, and between the outer stator permanent magnet and the outer rotor. The inner rotor permanent magnet is composed of 2n radially alternating magnetized permanent magnet units uniformly distributed along the circumference, and n is a positive integer;

The inner rotor core unit is fixed on the output shaft, the inner rotor permanent magnet is fixed on the inner rotor core unit, and the inner and outer side walls of the stator magnetic isolation radially are respectively fixedly connected to the outer side wall of the inner stator core unit and the inner side wall of the outer stator core unit. .

Further, the modulating rotor is fixedly connected to the input shaft through the modulating rotor bracket, and is rotatably connected to the output shaft; the inner stator core unit, the stator magnetic isolation, the outer stator core unit, and the outer stator permanent magnet form a stator unit, which is The stator bracket is fixedly connected to a motor casing and is rotatably connected to the output shaft; the outer rotor is fixedly connected to the output shaft through the outer rotor bracket, and is rotatably connected to the motor casing; the motor casing is respectively rotatably connected to the input shaft and the output shaft.

Further, the outer stator core unit is in the shape of an annular shape, the outer surface of which is provided with a plurality of slots along the axial direction, the openings of the plurality of slots are directed toward the outer rotor, and the centerlines of the slot openings are evenly distributed along the circumference, and the plurality of slots are distributed evenly along the circumference. The outer stator windings are embedded in each slot to form m-phase windings. When m-phase symmetrical alternating current is passed through, a rotating magnetic field with 2p poles is formed, and m and p are both positive integers.

Further, the inner stator core unit is annular, and its inner circular surface is provided with a plurality of grooves along the axial direction, the opening centerlines of the plurality of grooves are evenly distributed around the circumferential direction of the rotating shaft, and the plurality of grooves are respectively The inner stator windings are embedded to form m ₁ phase windings. When a symmetric alternating current is passed into m ₁ phase, a rotating magnetic field with 2p ₁ poles is formed. Both m ₁ and p ₁ are positive integers.

Further, the inner rotor core unit is annular, the inner rotor permanent magnet is embedded in the inner rotor core unit or fixed on its outer surface, and the inner rotor core unit and the inner rotor permanent magnet form the inner rotor. , when the inner rotor rotates, the inner rotor surface magnetic field with the number of 2n poles is formed.

Further, the modulating rotor is annular and is composed of q blocks of magnetic conductive blocks 3-1 and q blocks of insulating blocks arranged alternately along the circumference, wherein q is a positive integer.

Further, the n, q, p ₁ satisfy p ₁ =|hn+kq|, where h is a positive odd number, and k is a positive integer.

Further, the outer rotor adopts a salient pole structure, and the radially inner rotating poles are evenly distributed on the circumference.

Further, the inner rotor permanent magnet adopts a surface-mounted Halbach permanent magnet structure, and the outer stator partition permanent magnet 6-2 adopts a radial alternate magnetization method.

Beneficial effects:

1. The utility model belongs to the brushless structure, because the winding on the stator does not need to be rotated, it overcomes the decrease in operating efficiency caused by the use of the brush slip ring feeding structure for the armature winding on the rotating inner rotor of the conventional dual-rotor motor, and is reliable. Reduced performance and frequent maintenance of components such as brushes.

2. The motor of the present invention has two rotating shafts, the modulating rotor is connected with the engine through the input rotating shaft, receives the mechanical power output by the engine, the inner rotor and the outer rotor are connected with the load through the output rotating shaft, and drive the load to run at a certain output speed and torque. , the rotational speeds of the two shafts are independent of each other, and in the permanent magnet modulated inner motor, when the modulated rotor rotational speed is equal to the engine rotational speed and operates in the high-speed range of the high-efficiency range, the inner rotor rotational speed is adjustable and is proportional to the torque of the modulated rotor. A certain proportional relationship makes the modulating rotor connected to the input shaft run at high speed and low torque, and the output shaft connected to the inner rotor runs at lower speed and higher torque. When the output power of the generator and the inner motor meets the load demand, since the outer rotor and the output shaft in the outer motor rotate at the same speed, the windings on the outer stator generate electric power through electromagnetic induction, which can be charged to the energy storage device through rectification; when the inner motor When the output torque is not enough to drive the load, the outer stator in the outer motor passes current through the battery, and the electromechanical energy conversion of the outer motor finally makes up for the shortage of output torque on the outer rotor and its connected output shaft.

3. In the utility model, the inner and outer stators are connected by non-magnetic-conducting stators in a magnetic isolation radial direction, which reduces the magnetic field coupling of the inner and outer motors. Therefore, the inner and outer motors can be independently controlled, which simplifies the control mode of the dual-rotor motor. In order to realize the brushless structure, the inner motor adopts the permanent magnet magnetic field modulation motor structure with double air gap, and further adopts the surface-advised Halbach permanent magnet on the inner rotor. The permanent magnetic field weakened by the double air gap; on the other hand, the iron loss of the inner motor is reduced, and the efficiency and power factor of the motor are improved. In the outer motor, the permanent magnet motor structure of stator partition is adopted, and the permanent magnet originally placed on the stator is separated from the stator core and placed between the circumferential air gap of the outer stator and the outer rotor. Torque output capability; on the other hand, it overcomes unstable factors such as winding insulation damage caused by high temperature rise caused by armature windings and permanent magnets both located on the stator, permanent magnets prone to irreversible demagnetization, etc. , so the motor outside the stator partition improves the reliability of the motor operation.

4. The utility model is applied to the hybrid power system, which can realize stepless speed change and can replace the clutch, gearbox, starter and generator; The advantages of wide speed regulation range, better starting performance and high power density.

Description of drawings

Fig. 1 is the sectional view of the brushless dual-rotor composite motor structure proposed by the utility model;

Figure 2(a) and Figure 2(b) are schematic diagrams of the structure of the permanent magnet magnetic field modulation inner motor and the stator permanent magnet partition outer motor, respectively;

Figure 3 is a schematic diagram of the magnetization direction of the permanent magnets of the internal and external motors;

4 is a schematic structural diagram of a hybrid steam brushless dual-rotor composite motor of the present invention;

FIG. 5 is a structural diagram of a brushless dual-rotor motor HEV drive system proposed by the present invention.

Among them, 1-1 output shaft, 1-2 input shaft, 2 inner rotor, 2-1 inner rotor core unit, 2-2 inner rotor permanent magnet, 3 modulation rotor, 3-1 magnetic conductive block, 3-2 insulating block , 4 inner stator, 4-1 inner stator core unit, 4-2 inner stator winding, 5 stator magnetic isolation, 6 outer stator, 6-1 outer stator core unit, 6-2 outer stator winding, 6-3 outer stator permanent Magnets, 7 Outer Rotor, 8 Stator Unit, 9 Modulating Rotor Support, 10 First Bearing, 11 Second Bearing, 12 Stator Support, 13 Motor Housing, 14 Third Bearing, 15 Outer Rotor Support, 16 Fourth Bearing, 17 First Five bearings, 18 sixth bearings, 19 brushless dual-rotor motors, 20 engines, 21 power converters, 22 energy storage devices, 23 wheels, 24 power sockets.

Detailed ways

The present utility model will be described in detail below with reference to the accompanying drawings.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial" ", "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated A device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation of the present invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection connected, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication between two elements or the interaction between the two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

The technical solution of the present invention will be specifically described below by taking the radial magnetic field brushless dual-rotor motor shown in FIG. 1 as an example.

The utility model relates to the technical field of motors, and discloses a brushless dual-rotor composite motor structure, comprising a motor housing 13, an input shaft 1-2, an output shaft 1-1 arranged coaxially, and an inner rotor surrounding the output shaft 1-1 The core unit 2-1, the inner rotor permanent magnet 2-2 surrounding the inner rotor core unit 2-1, the modulating rotor 3 surrounding the inner rotor permanent magnet 2-2, the inner stator core unit 4-1 surrounding the modulating rotor 3, the surrounding The stator magnetic isolation 5 of the inner stator core unit 4-1, the outer stator core unit 6-1 surrounding the stator magnetic isolation 5, the outer stator permanent magnet 6-3 surrounding the outer stator core unit 6-1, and the outer stator permanent magnet 6 -3 Outer Rotor 7.

In this embodiment, between the inner rotor permanent magnet 2-2 and the modulating rotor 3, between the modulating rotor 3 and the inner stator core unit 4-1, and between the outer stator core unit 6-1 and the outer stator permanent magnet 6-3 An air gap is provided between the space between the outer stator permanent magnets 6-3 and the outer rotor 7. The inner rotor core unit 2-1 is fixedly connected to the output shaft 1-1, the inner rotor permanent magnet 2-2 is fixed on the inner rotor core unit 2-1, and the radially inner and outer side walls of the stator magnetic isolation 5 are respectively connected to the inner stator core. The outer side wall of the unit 4-1 and the inner side wall of the outer stator core unit 6-1 are fixedly connected.

The outer stator core unit 6-1 is annular, and the outer circumferential surface is provided with a plurality of slots in the axial direction. The openings of the plurality of slots of the outer stator core unit 6-1 point to the outer rotor 7, and the centerlines of the slot openings are evenly distributed along the circumference. , the outer stator winding 6-2 is embedded in each slot to form an m-phase winding. When m-phase symmetrical alternating current is passed through, a rotating magnetic field with 2p poles is formed, and m and p are positive integers.

The inner stator core unit 4-1 is annular, and its inner circular surface is also provided with a plurality of slots along the axial direction, and the opening centerlines of the plurality of slots on the inner stator core unit 4-1 are uniform around the circumference of the output shaft 1-1. distribution, and an inner stator winding 4-2 is embedded in each slot to form m ₁ -phase windings. When m ₁ phase symmetric alternating current is passed through, a rotating magnetic field with 2p ₁ poles is formed, and m ₁ and p ₁ are positive integers. .

2, the outer stator core unit 6-1, the outer stator permanent magnet 6-3, the outer stator winding 6-2 constitute the outer stator 6, the inner stator core unit 4-1 and the inner stator winding 4-2 constitute the inner stator 4, The inner rotor core unit 2 - 1 and the inner rotor permanent magnet 2 - 2 constitute the inner rotor 2 . The outer stator 6 and the outer rotor 7 constitute a permanent magnet outer motor with stator partitions. The inner stator 4 , the modulating rotor 3 , and the inner rotor 2 constitute a permanent magnet magnetic field modulated inner motor, and satisfy p ₁ =|hn+kq|, where h is a positive odd number and k is a positive integer. The inner stator 4 , the stator magnetic isolation 5 , and the outer stator 6 constitute the stator unit 8 .

The inner rotor core unit 2-1 is annular, the inner rotor permanent magnet 2-2 is composed of 2n radially alternating magnetized permanent magnet units evenly distributed along the circumference, and 2n permanent magnet units are embedded in the inner rotor core unit 2-1 Inside or fixed on its outer surface, when the inner rotor 2 (inner rotor core unit 2-1, inner rotor permanent magnet 2-2) rotates, an inner rotor surface magnetic field with 2n poles is formed, where n is a positive integer.

The modulation rotor 3 is annular and is composed of q pieces of magnetic permeable blocks 3-1 and q pieces of insulating blocks 3-2 arranged staggered along the circumference, where q is a positive integer. The magnetic conductive block 3-1 is made of soft magnetic composite material, silicon steel sheet, solid iron or soft ferrite.

The outer rotor 7 adopts a salient pole structure, and its radially inner rotating poles are evenly distributed on the circumference, and the structure is simple.

Referring to Figure 3, the inner rotor permanent magnet 2-2 adopts the surface-mounted Halbach permanent magnet structure, and the outer stator permanent magnet 6-3 adopts the radial alternate magnetization method to improve the air gap magnetic density and make up for the magnetic loss of the multi-air gap structure , reduce magnetic flux leakage and improve power factor.

As shown in FIG. 4 , the inner rotor 2 is fixedly connected with the output shaft 1-1. The modulation rotor 3 is fixedly connected to the input shaft 1-2 through the modulation rotor bracket 9, and is rotatably connected to the output shaft 1-1 through the first bearing 10 and the second bearing 11. The stator unit 8 is fixedly connected to the housing 13 through the stator bracket 12 , and is rotatably connected to the output shaft 1 - 1 through the third bearing 14 . The outer rotor 7 is fixedly connected to the output shaft 1 - 1 through the outer rotor bracket 15 , and is rotatably connected to the housing through the fourth bearing 16 . The motor housing 13 is rotatably connected to the input shaft 1-2 and the output shaft 1-1 through the fifth bearing 17 and the sixth bearing 18, respectively.

As shown in FIG. 5 , the hybrid power system is driven by the brushless dual-rotor motor 19 proposed by the present invention. The dual-rotor motor 19 can be regarded as being composed of a concentrically arranged stator permanent magnet partition outer motor and a permanent magnet magnetic field modulation inner motor. , both the outer stator 6 and the inner stator 4 have armature windings, and the detailed structure refers to the above description. The modulating rotor 3 is connected to the output shaft of the engine 20, and can be regarded as the input rotor (input shafts 1-2) of the dual-rotor motor. The rotor (output shaft 1-1), the input rotor and the output rotor become the two mechanical ports of the motor. The armature windings (inner stator winding 4-2, outer stator winding 6-2) on the inner and outer stators (4, 6) are connected to the energy storage device 22 through the power conversion module 21, and become two-way bidirectional electrical ports of the motor.

When applied to a hybrid power system, the utility model has the characteristics of brushless, high reliability, wider speed regulation range, and large torque output capability.

Applied to the hybrid system, the double rotor motor replaces the clutch, gearbox, starter, generator and planetary gear. It not only has the advantages of the series mode, that is, the engine can run on the high-efficiency line independently of the vehicle condition; but also overcomes the limitation of the series connection, that is, the output energy of the engine only provides a part of the electromagnetic power through the mechanical energy-electrical-mechanical energy output, and most of the electromagnetic force is directly transmitted to the output. The shaft greatly improves the efficiency and greatly reduces the capacity of the motor and battery.

When used in a hybrid power system, it can realize the conversion of various working modes during hybrid driving, and make the engine work in the best working area under any load (the inner motor provides the speed difference, and the outer motor provides the torque difference).

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the technology to understand the content of the present invention and implement accordingly, and cannot limit the protection scope of the present invention. All equivalent transformations or modifications made according to the spirit of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A brushless double-rotor composite motor structure is characterized in that, the magnetic control device comprises an input rotating shaft (1-2), an output rotating shaft (1-1) which is coaxially arranged with the input rotating shaft (1-2), an inner rotor iron core unit (2-1) which surrounds the output rotating shaft (1-1), an inner rotor permanent magnet (2-2) which surrounds the inner rotor iron core unit (2-1), a modulation rotor (3) which surrounds the inner rotor permanent magnet (2-2), an inner stator iron core unit (4-1) which surrounds the modulation rotor (3), a stator magnetism isolating unit (5) which surrounds the inner stator iron core unit (4-1), an outer stator iron core unit (6-1) which surrounds the stator magnetism isolating unit (5), an outer stator permanent magnet (6-3) which surrounds the outer stator iron core unit (6-1), and an outer rotor (7) which surrounds the outer stator permanent magnet (6-3);

air gaps are arranged between the inner rotor permanent magnet (2-2) and the modulation rotor (3), between the modulation rotor (3) and the inner stator iron core unit (4-1), between the outer stator iron core unit (6-1) and the outer stator permanent magnet (6-3) and between the outer stator permanent magnet (6-3) and the outer rotor (7); the inner rotor permanent magnet (2-2) is composed of 2n radial alternate magnetizing permanent magnet units which are uniformly distributed along the circumference, and n is a positive integer;

the inner rotor iron core unit (2-1) is fixed on the output rotating shaft (1-1), the inner rotor permanent magnet (2-2) is fixed on the inner rotor iron core unit (2-1), and the radial inner side wall and the radial outer side wall of the stator magnetism isolating unit (5) are respectively and fixedly connected with the outer side wall of the inner stator iron core unit (4-1) and the inner side wall of the outer stator iron core unit (6-1).

2. The brushless double-rotor composite motor structure according to claim 1, wherein the modulation rotor (3) is fixedly connected with the input rotating shaft (1-2) through a modulation rotor bracket (9) and is rotatably connected with the output rotating shaft (1-1); the inner stator iron core unit (4-1), the stator magnetism isolating unit (5), the outer stator iron core unit (6-1) and the outer stator permanent magnet (6-3) form a stator unit (8), and the stator unit is fixedly connected with a motor shell (13) through a stator bracket (12) and is rotationally connected with the output rotating shaft (1-1); the outer rotor (7) is fixedly connected with the output rotating shaft (1-1) through an outer rotor bracket (15) and is rotationally connected with the motor shell (13); the motor shell (13) is respectively connected with the input rotating shaft (1-2) and the output rotating shaft (1-1) in a rotating mode.

3. The structure of the brushless double-rotor composite motor according to claim 1, wherein the outer stator core unit (6-1) is a circular ring, the outer circumferential surface of the outer stator core unit is axially provided with a plurality of slots, the openings of the slots are directed to the outer rotor (7), the center lines of the slot openings are uniformly distributed along the circumference, the outer stator windings (6-2) are respectively embedded in the slots to form m-phase windings, when m symmetrical alternating currents are introduced, a rotating magnetic field with the number of 2p poles is formed, and m and p are positive integers.

4. The structure of the brushless double-rotor composite motor according to claim 1, wherein the inner stator core unit (4-1) has a circular ring shape, and the inner circular surface thereof is axially opened with a plurality of slots having the opening center lines uniformly distributed around the circumferential direction of the output shaft (1-1), and the plurality of slots are respectively embedded with the inner stator winding (4-2) to form m₁Phase winding, passing through m₁When the alternating current is symmetrical, 2p is formed₁Rotating magnetic field of number of poles, m₁、p₁Are all positive integers.

5. The structure of the brushless double-rotor composite motor according to claim 4, wherein the inner rotor core unit (2-1) is circular, the inner rotor permanent magnet (2-2) is embedded inside the inner rotor core unit (2-1) or fixed on the outer circumferential surface thereof, the inner rotor core unit (2-1) and the inner rotor permanent magnet (2-2) constitute the inner rotor (2), and the inner rotor (2) forms an inner rotor surface magnetic field with 2n poles when rotating.

6. The structure of a brushless double-rotor composite motor according to claim 5, wherein the modulating rotor (3) is circular and is composed of q conductive blocks (3-1) and q insulating blocks (3-2) which are staggered along the circumference, wherein q is a positive integer.

7. The brushless dual rotor compound motor structure of claim 6, wherein said n, q, p₁Satisfies p₁= hn + kq |, where h is a positive odd number and k is a positive integer.

8. The structure of a brushless double-rotor composite motor according to any one of claims 1-7, wherein the outer rotor (7) has a salient pole structure in which radially inner poles are uniformly distributed on the circumference.

9. The structure of the brushless double-rotor composite motor according to any one of claims 1-7, wherein the inner rotor permanent magnets (2-2) are of a surface-mounted Halbach permanent magnet structure, and the outer stator permanent magnets (6-3) are magnetized in a radial alternating mode.

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