CN109450121B - Iron core module, stator iron core and switched reluctance motor applying same - Google Patents

Abstract

The invention discloses an iron core module, a stator iron core and a switched reluctance motor using the same, and belongs to the technical field of switched reluctance motors. The stator core is formed by splicing k core modules which are equally divided along the circumferential direction, each core module comprises an assembling yoke part, a connecting yoke part and z salient poles, the connecting yoke parts are arranged between the salient poles and are connected with the salient poles, the assembling yoke parts are arranged at the left end and the right end of the connecting yoke parts and are used for butting adjacent core modules, pin grooves are formed in the end faces of the assembling yoke parts, which are used for butting, of the adjacent two core modules, after the assembling yoke parts are butted in order, the two pin grooves are just right opposite to form a pin mounting groove, pins are matched and inserted in the pin mounting groove, and the stator core is fixed in a motor shell through the assembling of the core modules and the interference plug insertion of the pins. The switch reluctance motor comprises a motor shell, a rotor core and the stator core. Through the design, the stator core is convenient to install and detach, and the working efficiency of the installation and the detachment of the motor can be improved.

Description

Core module, stator core and switched reluctance motor using the same

[Technical field]

The invention relates to the field of switched reluctance motors, and in particular to an iron core module, a stator iron core which is easy to disassemble and install, and a switched reluctance motor using the same.

【Background technique】

The Chinese utility model patent with application number CN201720681764.0 discloses a "single-phase multi-pole module and single-phase multi-pole module combined switched reluctance motor". It is the first in the history of motor development to design a motor with a yoke that can disconnect the magnetic circuit, which has made a great contribution to the development of switched reluctance motors. Its main advantages are: 1. Greatly reduce the adverse effects of phase-to-phase mutual inductance on the torque pulsation of the switched reluctance motor; 2. The stator core can be produced in sections and modules, which greatly saves mold costs; 3. The winding is convenient and simple, which greatly saves the winding production time and manpower. However, it also puts forward new requirements for the installation of single-phase multi-pole modules. For example, in one of the installation methods disclosed, a groove is set on the motor housing to fix the core module. Since the groove is set in the closed space of the motor housing, the processing is relatively difficult. The more feasible processing technology is wire cutting, which has high cost and low efficiency; the installation process requires strong press fitting or heat sleeve for each single-phase multi-pole module, and the installation operation is relatively complicated. In addition, since each single-phase multi-pole module is installed on the motor housing by interference fit, it is also difficult to operate when disassembling the single-phase multi-pole module.

Therefore, on the basis of inheriting the advantages of "single-phase multi-pole module and single-phase multi-pole module combined switched reluctance motor", further improvement and design of a stator core that is easy to install and disassemble and a switched reluctance motor using the same is a technical problem that needs to be solved by the existing switched reluctance motor.

[Summary of the invention]

In order to improve the deficiencies of the prior art, the purpose of the present invention is to provide a core module, a stator core that is easy to disassemble and install, and a switched reluctance motor using the same. Pin grooves are arranged on both end surfaces of the yoke of the core module. After the core modules are combined, two adjacent pin grooves form a column pin installation groove, and the column pin is installed in the column pin installation groove through interference fit to achieve the fixation of the stator core, which makes installation and disassembly more convenient.

The technical solution adopted by the present invention to solve the technical problem is:

A stator core which is easy to install and disassemble, comprises a core module and a pin. The stator core is formed by splicing k core modules which are equally divided along the circumferential direction, k≥2 and is a natural number, each of the core modules comprises an assembly yoke, a connecting yoke and z salient poles, z≥2 and is a natural number, the connecting yoke is arranged between the salient poles to connect the salient poles, the assembly yoke is arranged at the left and right ends of the connecting yoke for docking adjacent core modules, and pin grooves are provided on the end faces of the assembly yoke for docking, the pin grooves extend from the front end face of the assembly yoke to the rear end face, one end of the pin groove passes through the front end face of the assembly yoke or the two ends of the pin groove respectively pass through the front and rear end faces of the assembly yoke, after the assembly yokes of any two core modules are neatly docked, the two pin grooves are just opposite to form a pin installation groove, a pin is matched and inserted in the pin installation groove, and the stator core is fixed in the motor housing by splicing the core modules and interfering insertion of the pin.

For conventional motors, the stator core is pressed onto the motor housing as a whole, with the largest pressing force and difficult operation; for the "single-phase multi-pole module and single-phase multi-pole module combined switched reluctance motor" disclosed in the Chinese utility model patent application number CN201720681764.0, the multi-pole modules are pressed into the grooves of the motor housing as individual units, with relatively large pressing force and relatively low pressing efficiency; of course, both can be installed by heat-shrink fitting, but heat-shrink fitting brings about the problem of large energy consumption. By adopting the above-mentioned scheme provided by the present invention, during installation, the core module is placed in the motor housing, and after being assembled into the shape of the stator core, a pin is placed in each pin installation groove, and only the last pin of the installation operation needs to be pressed with force, and during disassembly, only the first pin of the disassembly operation needs to be disassembled with force. Since the pressing force is directly proportional to the contact area of the pressed component, and the contact area between the pin and the pin installation groove is much smaller than the contact area between the entire stator core and the motor housing, and also much smaller than the contact area between the single-phase multi-stage module and the groove of the motor housing, the pressing force will be greatly reduced by using the scheme designed by the present invention, and the production operation becomes convenient and simple.

The stator core has a phase number of q and a salient pole number of m. When used in combination with a rotor core with a salient pole number of n, m/n=zq/(zq+1). The salient poles on the core module belong to the same phase, and the angle between adjacent salient poles is 360°/n.

Preferably, the pin grooves on the end faces of the assembled yoke for docking are the same, and the pin grooves are circular grooves or square grooves. When the pin grooves are circular grooves, semicircular grooves or small semicircular grooves are used, and the column pins are cylindrical pins. The regular shape is more convenient for insertion. More preferably, as a more convenient solution for insertion, the pin grooves pass through the front and rear end faces of the assembled yoke along the axial direction of the stator core.

Preferably, after the pin is inserted into all the pin installation slots, there is a gap between the assembled yokes of two adjacent core modules, and the gap does not exceed 1/2 of the pin diameter. When the stator core is used to wind the winding, the salient poles on each core module are wound as one phase, so that the interphase yokes are not connected, which can greatly reduce the adverse effects of interphase mutual inductance on the torque pulsation of the switched reluctance motor.

The pins are made of stainless steel, and the diameters of the pins are the same. Stainless steel is non-magnetic and can further reduce the mutual inductance between phases.

Preferably, the end of the pin is also provided with an external thread or an internal thread for locking the end of the stator core.

Since the stator core is composed of k segmented core modules, k≥2 and is a natural number, and each core module has exactly the same structure, it can be used as an independent unit and has commercial attributes, so the present invention also protects the core module.

The present invention also provides a switched reluctance motor, comprising a motor housing, a rotor core and the above-mentioned stator core, wherein the stator core is installed in the motor housing by splicing core modules and pressing by interference-fitting of pins.

In the above-mentioned switched reluctance motor, the present invention preferably configures the salient poles on the core module to belong to the same phase, thereby forming a single-phase module having advantages unique to a single-phase module.

Due to the adoption of the above technical solution, the beneficial effects of the present invention are:

1. The stator core and the switched reluctance motor of the present invention are composed of segmented core modules. The assembly yoke of the core module is provided with a pin groove. After the core modules are assembled, two adjacent pin grooves form a column pin installation groove. After the core modules are assembled into the shape of the stator core in the motor housing, they are installed in the column pin installation groove through the interference fit of the column pin to achieve fixation. When disassembling, only one of the column pins needs to be pulled out for quick disassembly. The installation and disassembly are relatively convenient, which improves the production efficiency and maintenance efficiency of the motor.

2. The yoke of a traditional switched reluctance motor is used for magnetic conduction, and it is not allowed to be disconnected or to be provided with pin holes that reduce the magnetic conduction capacity. In the solution of the present invention, the core modules are disconnected and are compacted by plugging with pins. The pins are made of stainless steel non-magnetic material, and gaps are allowed in the core modules, which not only does not affect the normal function of the motor, but also facilitates installation and disassembly, reduces phase-to-phase mutual inductance, overcomes traditional technical prejudices, and achieves unexpected technical progress.

【Brief Description of the Drawings】

FIG. 1 is a three-dimensional structural diagram of a stator core of the present invention.

FIG. 2 is an axial projection view of FIG. 1 .

FIG. 3 is an axial projection view of the core module of the present invention.

FIG. 4 is an axial projection view of the core modules assembled into the shape of the stator core in the present invention.

The meanings of the markings in the figure are: 10-core module, 11-assembly yoke, 12-connection yoke, 13-salient pole, 14-pin groove, 15-column pin installation groove, 20-column pin.

【Detailed ways】

In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

As shown in Figures 1 and 2, a three-dimensional structural diagram and an axial projection view of the stator core of the present invention are shown. The stator core is characterized in that it is easy to install in the motor housing and is convenient to disassemble. Specifically, the stator core is composed of k core modules 10 equally divided along the circumferential direction. The number k of core modules 10 used in one stator core is 2 or a natural number greater than 2. The axial projection view of the core module 10 can refer to Figure 3. Each core module 10 includes an assembly yoke 11, a connecting yoke 12 and z salient poles 13. The number z of salient poles 13 on each core module 10 can be two or more, depending on the design requirements of the stator and the number of core modules 10; the connecting yoke 12 is arranged between the salient poles 13 for connecting the salient poles 13, the assembly yoke 11 is arranged at the left and right ends of the connecting yoke 12 for docking adjacent core modules, and pin grooves 14 are provided on the end faces of the assembly yoke 11 for docking. Each pin groove 14 is the same and symmetrically arranged about the central axis of the core module 10. The opening direction of the pin slot 14 extends from the front end face of the assembled yoke 11 to the rear end face, one end of the pin slot 14 penetrates the front end face of the assembled yoke 11 or the two ends of the pin slot 14 penetrate the front and rear end faces of the assembled yoke 11 respectively, preferably the pin slot 14 penetrates the front and rear end faces of the assembled yoke 11 along the axial direction of the stator core; refer to Figure 4, after the assembled yokes 11 of any two core modules are neatly butted, the two pin slots 14 just face each other to form a column pin installation slot 15. Refer to Figure 1 again, the column pin installation slot 15 is matched with a column pin 20, and the stator core is assembled through the core module 10, and the column pin 20 is inserted and pressed by interference, so as to be pressed and installed in the motor housing.

The pin groove 14 can be a circular groove or a square groove, or other shapes. In this embodiment, the pin groove 14 is preferably a circular groove, and a semicircular groove or a small semicircular groove is used, and the column pin 20 is correspondingly cylindrical. On the one hand, the regular shape and the smooth contact surface are more convenient for insertion. On the other hand, the small semicircular groove is used. After the column pin 20 is inserted into all the column pin installation grooves 15, a gap is formed between the assembled yokes 11 of two adjacent core modules 10; when the stator core is wound with windings, the salient poles 13 on each core module 10 belong to the same phase, so that the assembled yokes 11 between the phases are not connected, which greatly reduces the adverse effects of the phase-to-phase mutual inductance on the torque pulsation of the switched reluctance motor. As a preferred embodiment, the gap does not exceed 1/2 of the column pin diameter, making the overall structure more stable.

As a preferred embodiment, the stator core has q phases and m salient poles. When used in combination with a rotor core with n salient poles, m/n=zq/(zq+1), the salient poles on the core module belong to the same phase, and the angle between adjacent salient poles is 360°/n.

As a preferred embodiment, the pins 20 used above are made of stainless steel to isolate the magnetic conductivity between phases and reduce the mutual inductance between phases. Preferably, the diameters of the pins are the same to facilitate the unification of production models. The length of the pins 20 is greater than the thickness of the assembled yoke 11, and the ends of the pins 20 are also provided with external or internal threads for locking the ends of the stator core.

Refer to Figure 3, which is a schematic diagram of the planar structure of the core module in the present invention. The core module includes an assembled yoke 11, a connecting yoke 12 and z salient poles 13, z ≥ 2 and is a natural number, the connecting yoke 12 is arranged between the salient poles 13 to connect the salient poles 13, the assembled yoke 11 is arranged at the left and right ends of the connecting yoke 12 for docking adjacent core modules 10, and pin grooves 14 are provided on the end faces of the assembled yoke 11 for docking. The pin grooves 14 extend from the front end face of the assembled yoke 11 to the rear end face, one end of the pin groove 14 penetrates the front end face of the assembled yoke 11 or the two ends of the pin groove 14 respectively penetrate the front and rear end faces of the assembled yoke 11, after the assembled yokes 11 of any two core modules 10 are neatly docked, the two pin grooves 14 are just opposite to form a column pin installation groove 15, and k core modules 10 can be enclosed into a stator core, k ≥ 2.

The present invention further provides a switched reluctance motor, comprising a motor housing, a rotor core and the above-mentioned stator core, wherein the stator core is installed in the motor housing by splicing core modules 10 and inserting and pressing the pins 20 with interference fit.

As a preferred embodiment, in the above-mentioned switched reluctance motor, the present invention preferably has the salient poles 13 on the core module 10 belong to the same phase, thereby forming a single-phase module. By making the inter-phase yokes unconnected, the adverse effect of the inter-phase mutual inductance on the torque pulsation of the switched reluctance motor can be greatly reduced.

When installing the stator core of the present invention, the core module 10 is placed in the motor housing, and after being assembled into the shape of the stator core, a pin 20 is placed in each pin installation groove 15, and only the last pin 20 of the installation operation needs to be pressed with force, and when disassembling, only the first pin of the disassembly operation needs to be disassembled with force. Since the pressing force is directly proportional to the contact area of the pressed component, and the contact area between the pin 20 and the pin installation groove 15 is much smaller than the contact area between the entire stator core and the motor housing, and also much smaller than the contact area between the single-phase multi-stage module and the groove of the motor housing, the pressing force will be greatly reduced by using the design of the present invention, and the production operation becomes convenient and simple.

The above is only a description of the preferred implementation mode of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention.

Claims (9)

1. A stator core, characterized in that it includes a core module and a pin, the stator core is assembled by k core modules equally divided along the circumferential direction, k≥2 and is a natural number, each of the core modules includes an assembly yoke, a connecting yoke and z salient poles, z≥2 and is a natural number, the connecting yoke is arranged between the salient poles to connect the salient poles, the assembly yoke is arranged at the left and right ends of the connecting yoke for docking adjacent core modules, and pin grooves are provided on the end surfaces of the assembly yoke for docking, the pin grooves extend from the front end surface of the assembly yoke to the rear end surface, one end of the pin groove passes through the front end surface of the assembly yoke or the two ends of the pin groove respectively pass through the front and rear end surfaces of the assembly yoke, after the assembly yokes of two adjacent core modules are neatly docked, the two pin grooves are just opposite to form a pin installation groove, a pin is matched and inserted in the pin installation groove, and the stator core is fixed in the motor housing by the assembly of the core modules and the interference insertion of the pin; the pin is made of stainless steel non-magnetic material. 2. A stator core according to claim 1, characterized in that: the number of phases of the stator core is q and the number of salient poles is m. When used in combination with a rotor core with a salient pole number of n, m/n=zq/(zq+1), the salient poles on the core module belong to the same phase, and the angle between adjacent salient poles is 360°/n. 3. A stator core according to claim 1, characterized in that: the pin groove is a circular groove or a square groove. When the pin groove is a circular groove, a semicircular groove or a small semicircular groove is used, and the column pin is a cylindrical pin. 4. A stator core according to claim 1 or 3, characterized in that: after the pins are inserted into all the pin installation grooves, there is a gap between the assembled yoke parts of two adjacent core modules, and the gap does not exceed 1/2 of the pin diameter. 5. A stator core according to claim 1, characterized in that: the pin groove passes through the front and rear end surfaces of the assembled yoke along the axial direction of the stator core. 6. A stator core according to claim 4, characterized in that the pins are made of stainless steel and the diameters of the pins are the same. 7. The core module used in the stator core as described in any one of claims 1-5 is characterized in that: the core module includes an assembled yoke, a connecting yoke and z salient poles, z≥2 and is a natural number, the connecting yoke is arranged between the salient poles to connect the salient poles, the assembled yoke is arranged at the left and right ends of the connecting yoke for docking adjacent core modules, and pin grooves are provided on the end faces of the assembled yoke for docking, the pin grooves extend from the front end face of the assembled yoke to the rear end face, one end of the pin groove penetrates the front end face of the assembled yoke or the two ends of the pin groove respectively penetrate the front and rear end faces of the assembled yoke, after the assembled yokes of two adjacent core modules are neatly docked, the two pin grooves are just opposite to form a column pin installation groove, and k core modules can be enclosed into a stator core, k≥2. 8. A switched reluctance motor, characterized in that it comprises a motor housing, a rotor core and a stator core according to any one of claims 1 to 6, wherein the stator core is fixed in the motor housing by assembling core modules and inserting pins by interference fit. 9 . The switched reluctance motor according to claim 8 , wherein the salient poles on the core module belong to the same phase.