CN215267848U

CN215267848U - 12/8-pole switched reluctance motor for electric vehicle

Info

Publication number: CN215267848U
Application number: CN202121587121.2U
Authority: CN
Inventors: 樊俊峰; 郝敬春; 盛俊周
Original assignee: Shenzhen Juli Dynamic Technology Co ltd
Current assignee: Shenzhen Juli Dynamic Technology Co ltd
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2021-12-21
Anticipated expiration: 2031-07-13

Abstract

An 12/8 pole switched reluctance motor for an electric vehicle comprises a casing, a stator fixedly connected to the inner circular surface of the casing, a rotor coaxially and rotatably matched in the stator, a front cover arranged at the front end of the casing, and a rear cover arranged at the rear end of the casing, wherein the rotor is provided with a motor shaft penetrating through the front cover and the rear cover along the axis, the motor shaft is respectively and rotatably matched with the front cover and the rear cover through a deep groove ball bearing, the rear end of the motor shaft is provided with a magnetic bead, and the rear end of the rear cover is provided with a position detection unit matched with the magnetic bead; the left side of the outer circular surface of the casing is provided with a horn connecting seat which is provided with a first connecting arm and a second connecting arm which are positioned on the same circumference on the outer circular surface of the casing, and the first connecting arm and the second connecting arm respectively extend out along the radial direction of the casing; the front end of the front cover is provided with a speed change mechanism, the speed change mechanism is provided with an output shaft, and a speed change gear set for variable speed transmission is formed between the output shaft and a motor shaft. The utility model discloses with the effectual combination of automobile body of electric motor car, reduced fault rate and maintenance cost, improved work efficiency.

Description

12/8-pole switched reluctance motor for electric vehicle

Technical Field

The utility model belongs to the technical field of the motor technique and specifically relates to an 12/8 utmost point switched reluctance motor for electric motor car.

Background

The switched reluctance motor is a type of speed-regulating motor developed after a direct current motor and a brushless direct current motor, and is widely applied to electric automobiles and electric bicycles. Relatively speaking, the switched reluctance motor has the advantages of simple structure, large starting torque and low current power consumption, is more suitable for the running mode of frequent starting of the electric vehicle, is beneficial to improving the working efficiency and reducing the working noise, and therefore, the switched reluctance motor better meets the environmental protection requirement and the market demand, has low dependency on rare resources and can be used on a large number of vehicles.

The switched reluctance motor has a similar structure to the stepping motor except that the switched reluctance motor has fewer magnetic poles. The switched reluctance motor is a double salient pole variable reluctance motor, salient poles of a stator and a rotor of the switched reluctance motor are formed by laminating common silicon steel sheets, the rotor has no winding or permanent magnet, concentrated windings are wound on the stator poles, and two opposite radial windings are connected together and are called as a 'one phase'. The switch reluctance motor can be designed into various phase number structures, and the pole numbers of the stator and the rotor have various different collocation.

In practice, the applicant finds that the switched reluctance motor in the prior art is mostly designed in a structure independent of the electric vehicle, so that when the switched reluctance motor is applied to the electric vehicle, an additional auxiliary component is required to be arranged, the assembly is complicated, and the failure rate and the maintenance cost are increased. And because the assembly is difficult to be accurately carried out in the production process, the stator and the rotor cannot be ideally matched due to overlarge assembly tolerance, the motor works poorly, and enough starting torque and low quick-acting rate cannot be better provided for the electric vehicle.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above-mentioned not enough among the prior art, the utility model provides an 12/8 utmost point switched reluctance motor for electric motor car, its technical scheme as follows.

An 12/8 pole switched reluctance motor for an electric vehicle comprises a casing, a stator fixedly connected to the inner circular surface of the casing, a rotor coaxially and rotatably matched in the stator, a front cover arranged at the front end of the casing, and a rear cover arranged at the rear end of the casing, wherein the rotor is provided with a motor shaft penetrating through the front cover and the rear cover along the axis, the motor shaft is respectively and rotatably matched with the front cover and the rear cover through a deep groove ball bearing, the rear end of the motor shaft is provided with a magnetic bead, and the rear end of the rear cover is provided with a position detection unit matched with the magnetic bead;

twelve first salient poles which are uniformly spaced are arranged on the inner wall of the stator, coil windings are respectively arranged on the first salient poles, and the coil windings on the first salient poles which are matched in a cross-shaped symmetrical mode relative to the axial direction of the stator are mutually connected to form a three-phase winding;

eight second salient poles which are uniformly spaced are arranged on the outer wall of the rotor, and the stator and the rotor are matched through a structure of 12/8 poles formed by the first salient poles and the second salient poles;

the left side of the outer circular surface of the casing is provided with a horn connecting seat which is provided with a first connecting arm and a second connecting arm which are positioned on the same circumference on the outer circular surface of the casing, and the first connecting arm and the second connecting arm respectively extend out along the radial direction of the casing;

the front end of the front cover is provided with a speed change mechanism, the speed change mechanism is provided with an output shaft, and a speed change gear set for variable speed transmission is formed between the output shaft and a motor shaft.

The tail end of the first salient pole is provided with a first pole shoe, and an air gap is formed by the first pole shoe and the rotor in a clearance fit mode.

Compared with the prior art, the beneficial effects of the utility model reside in that:

(1) the switched reluctance motor with 12/8 poles is adopted, so that an SRD speed regulating system integrating electronic and electrical engineering and motor engineering is provided for the electric vehicle;

(2) the horn connecting seat of the shell is effectively combined with the body of the electric vehicle, so that the number of parts is reduced, the installation is facilitated, and the failure rate and the maintenance cost are reduced;

(3) an air gap between a pole shoe of the stator and the rotor better reduces torque pulsation and noise and vibration;

(4) the output torque of the motor shaft is increased through the prefabricated speed change mechanism, and the working efficiency is improved.

The present invention will be further described with reference to the drawings and the detailed description.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a schematic structural diagram of the stator of the middle casing according to the present invention.

Fig. 4 is a schematic structural diagram of a rotor of a casing according to the present invention.

Fig. 5 is a schematic structural diagram of the middle housing of the present invention.

Fig. 6 is a schematic structural diagram of the middle transmission mechanism of the present invention.

Fig. 7 is a schematic view of the working principle of the stator and the rotor in the present invention.

Fig. 8 is a schematic view of the working principle of the present invention.

Fig. 9 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

As shown in fig. 1 to 7, an 12/8 pole switched reluctance motor for an electric vehicle includes a housing 1, a stator 2 fixed on an inner circumferential surface of the housing 1, a rotor 3 coaxially and rotatably fitted in the stator 2, a front cover 4 disposed at a front end of the housing 1, and a rear cover 5 disposed at a rear end of the housing 1, wherein the rotor 3 has a motor shaft 6 penetrating through the front cover 4 and the rear cover 5 along an axis, the motor shaft 6 is respectively rotatably fitted with the front cover 4 and the rear cover 5 through a deep groove ball bearing, a magnetic bead 61 is disposed at a rear end of the motor shaft 6, and a position detecting unit 7 fitted with the magnetic bead 61 is disposed at a rear end of the rear cover 5;

twelve first salient poles 20 with uniform intervals are arranged on the inner wall of the stator 2, coil windings 21 are respectively arranged on the first salient poles 20, and the coil windings 21 on the first salient poles 20 which are matched in a cross-shaped symmetrical mode relative to the axial direction of the stator 2 are mutually connected to form a three-phase winding;

eight second salient poles 30 which are evenly spaced are arranged on the outer wall of the rotor 3, and the stator 2 and the rotor 3 are matched through a structure of 12/8 poles formed by the first salient poles 20 and the second salient poles 30;

the outer circumferential surface of the casing 1 is provided with a horn connecting seat 10 on the left side, the horn connecting seat 10 is provided with a first connecting arm 11 and a second connecting arm 12 which are positioned on the same circumference on the outer circumferential surface of the casing 1, and the first connecting arm 11 and the second connecting arm 12 respectively extend out along the radial direction of the casing 1;

the front end of the front cover 4 is provided with a speed change mechanism 8, and the speed change mechanism 8 has an output shaft 81 and a speed change gear group 82 constituting a speed change transmission between the output shaft 81 and the motor shaft 6.

As shown in fig. 7, the above-described embodiment employs an 12/8-pole three-phase arrangement.

As shown in fig. 8, the above embodiment is embodied by operating the engagement controller 99. In the position detection unit 7, the position detection plate 71 cooperates with the magnetic beads 61 to send the detected magnetic pole position signal of the rotor 3 to the controller, the controller 99 judges according to the position signal, judges the on-off time of the three-phase winding excitation of the stator 2, implements the circulating operation, and provides the electric vehicle with an SRD speed regulation system integrating the electronic engineering and the motor engineering.

As shown in fig. 9, taking an electric bicycle as an example, the 12/8-pole switched reluctance motor for an electric vehicle provided in the above embodiment is employed. The electric bicycle is provided with a triangular frame 9, and the horn connecting seat 10 of the casing 1 is directly and fixedly connected to the frame 9 through the first connecting arm 11 and the second connecting arm 12, so that the electric bicycle is stably installed without additionally arranging an auxiliary component. The ox horn connecting seat 10 of the casing 1 is effectively combined with the body of the electric vehicle, so that parts are reduced, better installation is facilitated, and the failure rate and the maintenance cost are reduced.

Meanwhile, due to the fact that the speed change mechanism 8 is arranged at the front end of the front cover 4, the output torque of the motor shaft 6 is increased through the prefabricated speed change mechanism 8, and working efficiency is improved.

Preferably, as shown in fig. 5, the outer circumferential surface of the casing 1 has a foot rest 13 on the left side, and the foot rest 13 horizontally extends along the lower tangent of the outer circumferential surface of the casing 1. In the embodiment shown in fig. 9, the frame 9 has a horizontal foot rest 91 and a beam frame 92 fixed on the foot rest 91, the ox horn connecting seat 10 of the casing 1 is directly fixed on the beam frame 92 through the first connecting arm 11 and the second connecting arm 12, and meanwhile, the foot support 13 of the casing 1 is fixed on the foot rest 91, so that the casing 1 is more stably installed.

Preferably, as shown in fig. 6, the output shaft 81 has a sprocket 83 coaxially disposed thereon so as to arrange a drive chain for vehicle driving.

Preferably, the front end of the front cover 4 is provided with a protective cover 40, the periphery of the protective cover 40 faces the front cover 4 to form a side wall 41 for shielding the speed change mechanism 8, and the side wall 41 is provided with a position avoiding opening 42 for arranging a transmission chain.

Preferably, the position detecting unit 7 includes a position detecting plate 71, a position plate rear cover 72; wherein, position detecting plate 71 is disposed on a side of magnetic bead 61 away from motor shaft 6, position plate rear cover 72 provides a space for accommodating the rear end of motor shaft 6 and position detecting plate 71, and the periphery of position plate rear cover 72 is fixedly connected to the rear end of rear cover 5.

Preferably, the first salient pole 20 has a first pole shoe 201 at the end thereof, and the first pole shoe 201 and the rotor 3 are in clearance fit to form an air gap, so as to further reduce torque ripple, thereby better reducing noise and vibration.

For those skilled in the art, the protection scope of the present invention is not limited to the details of the above-described exemplary embodiments, and all the embodiments with variations within the scope and meaning equivalent to the elements of the present invention should be included in the present invention without departing from the spirit or essential characteristics of the present invention.

Claims

1. An 12/8 pole switched reluctance motor for an electric vehicle comprises a casing, a stator fixedly connected to the inner circular surface of the casing, a rotor coaxially and rotatably matched in the stator, a front cover arranged at the front end of the casing, and a rear cover arranged at the rear end of the casing, wherein the rotor is provided with a motor shaft penetrating through the front cover and the rear cover along the axis, the motor shaft is respectively and rotatably matched with the front cover and the rear cover through a deep groove ball bearing, the rear end of the motor shaft is provided with a magnetic bead, and the rear end of the rear cover is provided with a position detection unit matched with the magnetic bead;

the method is characterized in that:

2. The 12/8 pole switched reluctance machine for electric vehicles of claim 1 wherein: the outer circle surface of the casing is provided with a foot support on the left side, and the foot support horizontally extends along the tangent line of the lower edge of the outer circle surface of the casing.

3. The 12/8 pole switched reluctance machine for electric vehicles of claim 1 wherein: the output shaft is provided with a chain wheel which is coaxially arranged.

4. The 12/8 pole switched reluctance machine for electric vehicles according to claim 3, wherein: the front end of the front cover is provided with a protective cover, the periphery of the protective cover faces the front cover to form a side wall which encloses the speed change mechanism, and the side wall is provided with a position avoiding opening.

5. The 12/8 pole switched reluctance machine for electric vehicles of claim 1 wherein: the position detection unit comprises a position detection plate and a position plate rear cover; the position plate rear cover provides an accommodating space for the rear end of the motor shaft and the position detection plate, and the periphery of the position plate rear cover is fixedly connected with the rear end of the rear cover.

6. The 12/8-pole switched reluctance motor for electric vehicles according to any one of claims 1 to 5, wherein: the tail end of the first salient pole is provided with a first pole shoe, the tail end of the second salient pole is provided with a second pole shoe, and the first pole shoe and the second pole shoe are in clearance fit to form an air gap.