WO2021174592A1

WO2021174592A1 - Stepper motor

Info

Publication number: WO2021174592A1
Application number: PCT/CN2020/079684
Authority: WO
Inventors: 邹习习; 易镇; 钟文
Original assignee: 诚瑞光学(常州)股份有限公司
Priority date: 2020-03-06
Filing date: 2020-03-17
Publication date: 2021-09-10
Also published as: CN211606363U

Abstract

Provided in the present application is a stepper motor, the motor comprising: a housing and a stator and a rotor that are accommodated within the housing; the stator is disposed surrounding the rotor; the rotor comprises a magnetically conductive housing and a rotor pole that is sleeved on the magnetically conductive housing and that is an annular shape; the magnetically conductive housing comprises a circular bottom wall, a side wall that extends upward from an edge of the bottom wall, and a top wall that extends from a top end of the side wall toward the center near to an end cap, and a rotary shaft; and the rotor pole is disposed on the side wall. By providing a hollow rotor, the goal of reducing the rotor moment of inertia, increasing self-starting frequency, improving work frequency reverse drive (locked-rotor performance), and reducing costs may be attained while not reducing the output torque of a motor.

Description

A stepping motor

Technical field

This application relates to the field of motor technology, and in particular to a stepping motor.

Background technique

Because of its compact structure, high power density, high work efficiency, and significant energy saving and consumption reduction benefits, stepping motors have been widely used in the fields of motors and generators. In recent years, the industrial field has more and more urgent requirements for devices that use stepper motors to directly drive loads. The wide application of these stepper motors directly drive devices will produce immeasurable energy-saving benefits. A stepper motor usually includes a rotor and a stator. The rotor of the stepper motor in the related technology is a solid structure, but the solid rotor has a large moment of inertia, which affects the dynamic performance and reverse drive (locked-rotor performance) of the motor; and the solid rotor uses more materials , The cost is relatively high. Therefore, it is necessary to provide a stepping motor to improve the above-mentioned problems.

technical problem

The purpose of this application is to provide a stepper motor with a hollow rotor built in to solve the above-mentioned drawbacks.

Technical solutions

The technical solution of the present application is as follows: a stepping motor, the motor comprising: a housing, a stator and a rotor housed in the housing, the stator being arranged around the rotor;

The outer shell includes a circular bottom cover, a shell wall extending upward from the edge of the bottom cover perpendicular to the bottom cover, and an end cover extending from the top of the shell wall to the center and parallel to the bottom cover, and is arranged at the bottom cover. The first bearing on the bottom cover and the second bearing provided on the end cover, the first bearing and the second bearing are arranged oppositely, the bottom cover, the shell wall and the end cover are formed An accommodation space for accommodating the stator and the rotor;

The rotor includes a magnetically permeable shell extending between the bottom cover and the end cover and connected to the first bearing and the second bearing, and a magnetically permeable shell sleeved on the magnetically permeable shell. Ring-shaped rotor poles;

The magnetically conductive housing includes a circular bottom wall arranged close to the bottom cover and parallel to the bottom cover, a side wall extending upward from the edge of the bottom wall, and a side wall extending from the top end of the side wall toward the center near the bottom wall. The top wall of the end cover, and a rotating shaft connecting the bottom wall and the first bearing and connecting the top wall and the second bearing, the bottom wall, the side wall and the top wall surround Forming a cavity, the rotor magnetic poles are arranged on the side walls and extend between the bottom wall and the top wall;

The stator extends between the bottom cover and the end cover, and the stator is sleeved outside the rotor at intervals and abuts against the shell wall.

Preferably, the rotating shaft penetrates the bottom wall and the top wall and is connected to the first bearing and the second bearing.

Preferably, the rotating shaft includes a first rotating shaft extending from the center of the bottom wall in a direction approaching the first bearing and a second rotating shaft extending from the center of the top wall in a direction approaching the second bearing.

Preferably, the rotor magnetic poles include a plurality of first magnetic strips and second magnetic strips with opposite magnetic poles, and the first magnetic strips and the second magnetic strips are spaced apart to form a ring-shaped magnetic pole.

Preferably, the rotor magnetic poles are glued and/or clamped to the magnetic conductive shell.

Preferably, the first bearing and the second bearing have the same arrangement and include a cylindrical support seat and an annular abutment plate provided at both ends of the support seat, and the bottom cover and the end cover are provided with a facing direction. A first plane of the rotor and a second plane facing away from the rotor, the first plane and the second plane are disposed opposite to each other, and the support seat extends through the first plane to the second plane and extends through the For the bottom cover or the end cover, the abutting plate abuts against the first plane and the second plane, respectively.

Preferably, the rotor further includes a gasket provided between the abutment plate and the bottom wall or between the abutment plate and the top wall, and the gasket is sleeved on the On the shaft.

Preferably, the stator includes a cylindrical frame spaced apart from the shell wall, sleeved on the side of the frame close to the shell wall and opposite to the shell wall, and connected to the coil that is far away from the shell wall. The stator magnetic poles abutting on the side of the frame.

Preferably, the stator magnetic pole includes a first claw-shaped half body and a second claw-shaped half body that cooperate with each other, the first claw-shaped half body includes a plurality of first claw-shaped magnetic poles, and the second claw-shaped half body includes A plurality of second claw-shaped magnetic poles, the first claw-shaped magnetic poles and the second claw-shaped magnetic poles are alternately arranged to form a cylindrical stator magnetic pole.

Preferably, the first claw-shaped magnetic pole and the second claw-shaped magnetic pole have opposite magnetic poles, respectively corresponding to the first magnetic strip and the second magnetic strip.

Beneficial effect

The beneficial effect of the present application is that a stepping motor is provided, which includes a housing, a stator and a rotor housed in the housing, the stator is arranged around the rotor, and the rotor includes a magnetically permeable housing and is sleeved on The magnetically permeable housing is a ring-shaped rotor magnetic pole; the magnetically permeable housing includes a circular bottom wall, a side wall extending upward from the edge of the bottom wall, and a top end of the side wall extending toward the center. The top wall of the end cover and the rotating shaft connecting the rotor and the housing, and the rotor magnetic poles are arranged on the side walls. By setting the hollow rotor, it is possible to reduce the rotor moment of inertia, increase the self-starting frequency, improve the operating frequency back drive (lock-rotor performance), and reduce the cost without reducing the output torque of the motor.

Description of the drawings

Figure 1 is a structural diagram of a motor provided by an embodiment of the present application;

Figure 2 is an exploded view of the motor structure provided by an embodiment of the present application;

Figure 3 is an exploded view of the rotor structure provided by the first embodiment of the present application;

4 is a schematic sectional view of the motor along the A-A direction according to the first embodiment of the present application;

Figure 5 is an exploded view of the rotor structure provided by the second embodiment of the present application;

Fig. 6 is a schematic diagram of the cross-sectional structure of the motor in the A-A direction according to the second embodiment of the present application;

Fig. 7 is a schematic diagram of the explosion structure of the motor housing wall and stator magnetic pole coordination shown in Fig. 2 of the present application;

8 is the experimental data of the output torque of the motor and the solid rotor motor shown in the first embodiment of the present application;

FIG. 9 is the experimental data of the pull-in torque of the motor and the solid-rotor motor shown in the first embodiment of the present application;

Fig. 10 is the experimental data of the pull-out torque of the motor and the solid-rotor motor shown in the first embodiment of the present application.

Reference signs: motor 100; housing 1; bottom cover 11; housing wall 12; first housing wall 121; second housing wall 122; end cover 13; first bearing 14; second bearing 15; first plane 16; Two planes 17; supporting seat 18; abutment plate 19; rotor 2; magnetically conductive housing 21; bottom wall 211; side wall 212; top wall 213; rotating shaft 214; first rotating shaft 215; second rotating shaft 216; rotor magnetic pole 22 ; First magnetic strip 221; second magnetic strip 222; spacer 23; stator 3; skeleton 31; coil 32; stator magnetic pole 33; first claw-shaped half 331; first claw-shaped magnetic pole 3311; second claw-shaped half Body 332; second claw-shaped magnetic pole 3321.

Embodiments of the present invention

The application will be further described below in conjunction with the drawings and implementations.

It should be noted that the terms "first", "second", and "third" in the specification and claims of the application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific sequence. In addition, the term "including" and any variations of them are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes unlisted steps or units, or optionally also includes Other steps or units inherent to these processes, methods, products or equipment.

All directional indications (such as up, down, left, right, front, back, inside, outside, top, bottom...) in the embodiments of this application are only used to explain in a specific posture (as shown in the attached drawing) The relative positional relationship between the components, etc., if the specific posture changes, the directional indication will also change accordingly. When an element is referred to as being "fixed on" or "disposed on" another element, the element may be directly on the other element or a centering element may also be present at the same time. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time.

The present application provides a stepping motor 100. Please refer to FIGS. 1 to 9. The stepping motor 100 includes a housing 1, a stator 3 and a rotor 2 housed in the housing 1, and the stator 3 is arranged around the rotor 2.

In an optional embodiment, the housing 1 includes a circular bottom cover 11, a housing wall 12 extending upward from the edge of the bottom cover 11 perpendicular to the bottom cover 11, and a center extending from the top end of the housing wall 12 and parallel to the bottom cover 11. The end cover 13, the first bearing 14 provided on the bottom cover 11 and the second bearing 15 provided on the end cover 13, the first bearing 14 and the second bearing 15 are disposed oppositely, the bottom cover 11, the shell wall 12 and the end cover 13 forms a storage space for accommodating the stator 3 and the rotor 2.

The rotor 2 includes a magnetically permeable housing 21 extending between the bottom cover 11 and the end cover 13 and connected to the first bearing 14 and the second bearing 15 and a ring-shaped rotor magnetic pole sleeved on the magnetically permeable housing 21 twenty two.

The magnetically conductive housing 21 includes a circular bottom wall 211 arranged at the end of the bottom cover 11 and parallel to the bottom cover 11, a side wall 212 extending upward from the edge of the bottom wall 211, and a side wall 212 extending from the top of the side wall 212 to the center close to the end cover 13 The top wall 213, and the rotating shaft 214 connecting the bottom wall 211 with the first bearing 14 and the top wall 213 with the second bearing 15, the bottom wall 211, the side walls 212 and the top wall 213 are enclosed to form a cavity, and the rotor magnetic pole 22 is arranged in The side wall 212 extends between the bottom wall 211 and the top wall 213.

The stator 3 extends between the bottom cover 11 and the end cover 13, and the stator 3 is sleeved outside the rotor 2 at intervals and abuts against the shell wall 12.

In order to increase the output torque, in an optional embodiment, the magnetically permeable housing 21 uses a magnetically permeable material instead of plastic polymer materials such as resin. The thickness of the housing 21 can be varied. In an alternative embodiment, the first magnetic strips 221 and the second magnetic strips 222 with opposite magnetic poles (for example, one is N pole and the other is S pole) are interlaced and fixed on the outer surface of the magnetically permeable housing 21. , Surrounded to form a ring-shaped rotor magnetic pole 22, sleeved outside the magnetic conductive housing 21 to form the rotor 2. The number and thickness of the first magnetic stripe 221 and the second magnetic stripe 222 are the same and can be freely selected and matched, and the first magnetic stripe 221 and the second magnetic stripe 222 are strip-shaped and extend between the bottom wall 211 and the top wall 213 . In an optional embodiment, the magnetically conductive housing 21 is fixedly connected to the rotating shaft 214, and the fixed connection between the magnetically conductive housing 21 and the rotating shaft 214 includes at least one of welding, riveting, mechanical step buckle, etc., or a conductive housing The magnet 21 and the rotating shaft 214 are integrally formed. The fixing method of the rotor magnetic pole 22 and the magnetically conductive housing 21 includes glue connection or a combination of glue connection and mechanical step buckle connection.

In an alternative embodiment, please refer to FIGS. 3 and 4, which show a schematic diagram of the rotor structure of the first embodiment. The rotating shaft 214 is a columnar body extending from the bottom cover 11 to the end cover 13 and penetrates the magnetically permeable housing. The cavity inside 21 penetrates the bottom wall 211 and the top wall 213, and the two ends of the rotating shaft 214 are connected to the first bearing 14 and the second bearing 15 respectively.

In an alternative embodiment, please refer to Figures 5 and 7, which show a schematic diagram of the rotor structure of the second embodiment. The first rotating shaft 215 extends in the direction of the top wall 213 and the second rotating shaft 216 extending from the center of the top wall 213 to the direction close to the second bearing 15. The first rotating shaft 215 is connected to the first bearing 14, and the second rotating shaft 216 is connected to the second bearing 15 The rotating shaft 215 and the second rotating shaft 216 may not extend into the cavity.

On the basis of the above embodiment, in an alternative embodiment, please refer to FIG. 2. The first bearing 14 and the second bearing 15 are arranged the same, including a cylindrical support seat 18 and rings arranged at both ends of the support seat 18. The abutment plate 19, the bottom cover 11 and the end cover 13 are provided with a first plane 16 facing the rotor 2 and a second plane 17 facing away from the rotor 2. The first plane 16 and the second plane 17 are opposed to each other, and a cylindrical support seat 18 extends through the first plane 16 to the second plane 17 and extends through the bottom cover 11 or the end cover 13, the abutment plate 19 abuts the first plane 16 and the second plane 17 respectively, and the first bearing 14 and The second bearing 15 is fixed on the bottom cover 11 and the end cover 13 respectively.

On the basis of the above embodiment, in an alternative embodiment, please refer to FIG. 2. The rotor 2 further includes a rotor 2 arranged between the abutment plate 19 and the bottom wall 211 or between the abutment plate 19 and the top wall 213 The spacer 23 between the spacers 23 is sleeved on the rotating shaft 214.

On the basis of the above embodiment, in an alternative embodiment, please refer to FIG. 2. The stator 3 includes a cylindrical frame 31 spaced apart from the shell wall 12, sleeved on the side of the frame 31 close to the shell wall 12 and connected with The coil 32 facing the shell wall 12 and the stator magnetic pole 33 abutting on the side of the frame 31 away from the shell wall 12.

On the basis of the above embodiment, in an alternative embodiment, please refer to FIGS. 2 and 7. In this embodiment, the stator magnetic pole 33 includes a first claw-shaped half body 331 and a second claw-shaped half body that cooperate with each other. Body 332, the first claw-shaped half-body 331 includes a plurality of first claw-shaped magnetic poles 3311, the second claw-shaped half-body 332 includes a plurality of second claw-shaped magnetic poles 3321, the first claw-shaped magnetic pole 3311 and the second claw-shaped magnetic pole 3321 They are staggered to form cylindrical stator magnetic poles 33. The first claw-shaped magnetic pole 3311 and the second claw-shaped magnetic pole 3321 have opposite magnetic poles. For example, one of them is an N pole and the other is an S pole, corresponding to the first magnetic strip 221 and the second magnetic strip 222 respectively. In the embodiment of the present application, two sets of stators 3 are arranged along the axial direction, wherein the stator magnetic poles 33 of each set of stators 3 are one phase, and the present embodiment is a two-phase motor. Of course, each motor can also have multiple sets of stators 3 stacked in the axial direction, the stator magnetic poles 33 are set to be multi-phase, and the motor is a multi-phase motor. In an alternative embodiment, the shell wall 12 is divided into two parts, including a first shell wall 121 and a second shell wall 122, wherein the first shell wall 121 is integrated with the first claw-shaped magnetic pole 3321 of the stator 3. A shell wall 121 may also be integrated with the second claw-shaped magnetic pole 3321 of the stator 3.

For the stepping motor 100 of the rotor structure and the solid rotor stepping motor of related technology in the first embodiment, please refer to Figure 8-10. The stepping motor 100 is a two-phase stepping motor with an outer diameter of 4.5mm. The outer diameter of the hollow structure (magnetic shell or magnetic steel) remains unchanged at 1.15mm, the thickness is 0.25mm, and the thickness of the magnetic shell is 0.13mm. The moment of inertia of the motor is reduced by 10%, and the output torque is increased by 5%. The pull-out torque is increased by about 10%. The stepper motor 100 of the present application is provided with a hollow rotor, so as to reduce the rotor moment of inertia, increase the self-starting frequency, improve the working frequency back drive (lock-rotor performance), and reduce the cost without reducing the output torque of the motor. Purpose.

The above are only the implementation manners of this application. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the creative concept of this application, but these all belong to this application. The scope of protection.

Claims

1. A stepping motor, characterized in that the motor comprises: a housing, a stator and a rotor housed in the housing, the stator is arranged around the rotor; the housing includes a circular bottom cover, The edge of the bottom cover is perpendicular to the shell wall extending upwards of the bottom cover, the end cover extending from the top of the shell wall to the center and parallel to the bottom cover, the first bearing and the device provided on the bottom cover The second bearing on the end cover, the first bearing and the second bearing are arranged oppositely, the bottom cover, the shell wall and the end cover form a housing for accommodating the stator and the rotor Space; the rotor includes a magnetic shell extending between the bottom cover and the end cover and connected with the first bearing and the second bearing and sleeved on the magnetic shell And a ring-shaped rotor magnetic pole; the magnetically permeable housing includes a circular bottom wall arranged close to the bottom cover and parallel to the bottom cover, side walls extending upward from the edge of the bottom wall, and The top end of the side wall extends to the center and is close to the top wall of the end cover, and a rotating shaft connecting the bottom wall and the first bearing and connecting the top wall and the second bearing, the bottom wall and the side The wall and the top wall are enclosed to form a cavity, the rotor magnetic poles are arranged on the side walls and extend between the bottom wall and the top wall; the stator is located between the bottom cover and the end The cover extends between the covers, and the stator is sleeved outside the rotor at intervals and abuts against the shell wall.

2. The motor of claim 1, wherein the rotating shaft penetrates the bottom wall and the top wall and is connected to the first bearing and the second bearing.

3. The motor according to claim 1, wherein the rotating shaft includes a first rotating shaft extending from the center of the bottom wall toward the first bearing and from the center of the top wall toward the first bearing. A second rotating shaft extending in the direction of the two bearings.

4. The motor according to claim 1, wherein the rotor magnetic poles include a plurality of first magnetic strips and second magnetic strips with opposite magnetic poles, and the first magnetic strips and the second magnetic strips are spaced apart from each other. Into a ring magnetic pole.

5. The motor according to claim 1, wherein the rotor magnetic poles are glued and/or clamped to the magnetic conductive shell.

6. The motor according to claim 1, wherein the first bearing and the second bearing have the same arrangement, including a cylindrical support seat and annular abutment plates provided at both ends of the support seat, so The bottom cover and the end cover are provided with a first plane facing the rotor and a second plane facing away from the rotor, the first plane and the second plane are arranged oppositely, and the support seat penetrates the first plane. A flat surface extends through the bottom cover or the end cover toward the second flat surface, and the abutting plate abuts against the first flat surface and the second flat surface, respectively.

7. The motor according to claim 6, wherein the rotor further comprises a motor provided between the abutment plate and the bottom wall or between the abutment plate and the top wall. The gasket is sleeved on the rotating shaft.

8. The motor according to claim 4, wherein the stator includes a cylindrical frame spaced apart from the shell wall, and is sleeved on the frame side close to the shell wall and is in contact with the shell wall. Opposite coils and stator poles abutting on the side of the frame away from the shell wall.

9. The motor according to claim 8, wherein the stator magnetic pole comprises a first claw-shaped half body and a second claw-shaped half body that cooperate with each other, and the first claw-shaped half body includes a plurality of first claws. The second claw-shaped half body includes a plurality of second claw-shaped magnetic poles, and the first claw-shaped magnetic poles and the second claw-shaped magnetic poles are alternately arranged to form a cylindrical stator magnetic pole.

10. The motor of claim 9, wherein the first claw-shaped magnetic pole and the second claw-shaped magnetic pole have opposite magnetic poles, corresponding to the first magnetic strip and the second magnetic strip, respectively.