Stepping motor

Abstract

Provided in the present invention is a stepping motor, comprising a first cover plate, a second cover plate spaced apart and arranged opposite the first cover plate, and a stator and a rotor arranged between the two cover plates. The rotor comprises a rotating shaft and a steel magnet, wherein two ends of the rotating shaft are supported on the first cover plate and the second cover plate and form rotational connections with the cover plates, respectively; and the stator is spaced apart and disposed around the rotor. The stator comprises at least two drive units distributed in the axial direction of the rotor; each drive unit comprises an annular housing and a drive system fixed to the inner side of the housing, the outer circumferential side of the housing being square, and the inner circumferential side thereof being circular; and all the housings are sequentially stacked in the axial direction of the rotating shaft and arranged between the first and second cover plates. The stepping motor further comprises a circuit board attached and fixed to the outer circumferential side of each housing, the drive system being electrically connected to the circuit board. Compared with the related art, the stepping motor of the present invention has high housing strength and facilitates easy assembly.

Description

Stepping motor TECHNICAL FIELD

[0001] The present application relates to a motor device, in particular to a stepping motor. BACKGROUND

[0002] It has been widely used in the field of electric motor and generator. In recent years, the demand for using stepping motor to directly drive load work in industrial field is more and more urgent, and the wide application of these stepping motor direct drive equipment will produce immeasurable energy saving benefit. TECHNICAL PROBLEM

[0003] In the related art, the existing stepping motor is mostly a claw pole type permanent magnet stepping motor, which includes a rotor and a stator spaced around the rotor. The motor rotates by driving the stator and the rotor. The stator includes a shell, claw-shaped magnetic poles fixed in the shell, and windings around the claw-shaped magnetic poles. The rotor generally includes a shaft and a magnetic steel fixed to the outer periphery of the shaft. The claw-shaped magnetic poles are spaced around the magnetic steel. The motor rotates by driving the magnetic steel and the windings. However, the external shape of the shell of the existing stepping motor is generally circular (cylindrical surface) structure, and the outgoing line of the winding is connected to the external circuit board in the form of pin winding. The circular structure shell has weak strength and large installation space, and the pin winding requires additional installation space, which increases the width space of the product when the whole machine is stacked, occupies the overall space of the stepping motor, and makes the user experience unsatisfactory.

[0004] Therefore, it is necessary to provide a new stepping motor to solve the above technical problems. TECHNICAL SOLUTION

[0005] The technical problem to be solved by the present application is to provide a stepping motor with simple assembly and high shell strength.

[0006] To solve the above technical problems, the present application provides a stepping motor, which comprises a first cover plate, a second cover plate spaced opposite to the first cover plate, and a stator and a rotor clamped between the first cover plate and the second cover plate. The rotor comprises a shaft and a magnetic steel sleeved and fixed to the shaft. Both ends of the shaft are supported on the first cover plate and the second cover plate respectively and are rotatably connected to the first cover plate and the second cover plate respectively. The stator surrounds the rotor and is spaced from the rotor.

[0007] The stator comprises at least two driving units distributed along the axial direction of the rotor, each of the driving units comprises a ring-shaped shell coaxially arranged with the rotating shaft and a driving system fixed to the inner side of the shell; the outer periphery of the shell is square, and the inner periphery of the shell is circular, all the shells are sequentially stacked along the axial direction of the rotating shaft and clamped between the first cover plate and the second cover plate.

[0008] The stepping motor further comprises a circuit board fixedly attached to the outer periphery of the shell and extending along the axial direction of the rotating shaft, and the driving system is electrically connected with the circuit board.

[0009] Preferably, the driving system comprises a fixed claw pole fixed to the inner periphery of the shell and arranged around the rotor, and a winding sleeved and fixed to the fixed claw pole, and the winding is electrically connected with the circuit board.

[0010] Preferably, the side of the shell attached with the circuit board is provided with a leakage hole penetrating therethrough, and the lead wire of the winding extends outward through the leakage hole and is electrically connected with the circuit board.

[0011] Preferably, the circuit board comprises a circuit board body fixed to the shell and a plurality of welding portions provided on the side of the circuit board body away from the shell, the circuit board body is provided with a plurality of through holes penetrating therethrough, and the lead wire of the winding passes through the through holes and is welded to the welding portions.

[0012] Preferably, the stepping motor further comprises a plurality of wire sealing glue attached to the side of the circuit board away from the shell, and the wire sealing glue completely covers the welding portions.

[0013] Preferably, the fixed claw pole comprises a first claw pole half and a second claw pole half fixed to the inner side of the shell and matched with each other, and the winding is sleeved and fixed to the first claw pole half and the second claw pole half.

[0014] Preferably, the stepping motor further comprises a first gasket and a second gasket sleeved on the rotating shaft, and the first gasket and the second gasket are respectively fixed to the two ends of the magnetic steel.

[0015] Preferably, the stepping motor further comprises a first bearing and a second bearing, the first bearing is sleeved on one end of the rotating shaft close to the first cover plate and is embeddedly fixed to the first cover plate, and the second bearing is sleeved on one end of the rotating shaft close to the second cover plate and is embeddedly fixed to the second cover plate.

[0016] Preferably, the magnetic steel comprises a plurality of sub-magnetic steels arranged along the circumferential direction of the rotating shaft, and the polarities of the plurality of sub-magnetic steels are the same or alternately arranged in opposite directions.

[0017] Preferably, the shell is made of a magnetically conductive material. Advantages

[0018] Compared with the prior art, the step motor comprises a first cover plate, a second cover plate spaced from the first cover plate, a stator and a rotor clamped between the first cover plate and the second cover plate, the rotor comprises a rotating shaft and a magnetic steel sleeved and fixed to the rotating shaft, two ends of the rotating shaft are respectively supported on the first cover plate and the second cover plate and are respectively rotationally connected with the first cover plate and the second cover plate, and the stator is arranged around the rotor and is spaced from the rotor; the stator comprises at least two driving units distributed along the axial direction of the rotor, each driving unit comprises a ring-shaped shell coaxially arranged with the rotating shaft and a driving system fixed to the inner side of the shell; the outer periphery of the shell is square, and the inner periphery of the shell is circular, all the shells are sequentially stacked along the axial direction of the rotating shaft and clamped between the first cover plate and the second cover plate; the step motor further comprises a circuit board, the circuit board is fixedly attached to the outer periphery of the shell and extends along the axial direction of the rotating shaft, and the driving system is electrically connected with the circuit board. In the above structure, the shell of the step motor is square as a whole, which can significantly improve the bending strength of the device, and compared with the circular shell, the square shell can further improve the motor torque and increase the magnetic circuit, thereby further improving the motor torque, and the square shell is convenient for the attachment of the circuit board, thereby reducing the space occupancy of the wire-out structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0020] Fig. 1 is a perspective structural schematic view of the step motor provided by the embodiment of the present application;

[0021] Fig. 2 is a partial exploded structural schematic view of the step motor provided by the embodiment of the present application;

[0022] Fig. 3 is an overall exploded structural schematic view of the step motor provided by the embodiment of the present application;

[0023] Fig. 4 is a sectional view along line A-A in Fig. 1;

[0024] Fig. 5 is a sectional view along line B-B in Fig. 1. Embodiment of the present application

[0025] With reference to the accompanying drawings: clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0026] Please refer to FIG. 1-5, the embodiment of the present application provides a step motor 100, which comprises a first cover plate 1, a second cover plate 2 spaced opposite to the first cover plate 1, and a stator 3 and a rotor 4 clamped between the first cover plate 1 and the second cover plate 2, the rotor 4 comprises a rotating shaft 41 and a magnetic steel 42 sleeved and fixed on the rotating shaft 41, both ends of the rotating shaft 41 are supported on the first cover plate 1 and the second cover plate 2 respectively and form a rotating connection with the first cover plate 1 and the second cover plate 2 respectively, the stator 3 surrounds the rotor 4 and is spaced from the rotor 4;

[0027] The stator 3 comprises at least two driving units 31 distributed along the axial direction of the rotor 4, each driving unit 31 comprises a ring-shaped shell 311 coaxially arranged with the rotating shaft 41 and a driving system 312 fixed to the inner side of the shell 311; the outer periphery of the shell 311 is square, and the inner periphery of the shell 311 is circular, all the shells 311 are sequentially stacked along the axial direction of the rotating shaft 41 and clamped between the first cover plate 1 and the second cover plate 2.

[0028] The step motor 100 further comprises a circuit board 5, which is fixedly attached to the outer periphery of the shell 311 and extends along the axial direction of the rotating shaft 41, and the driving system 312 is electrically connected to the circuit board 5.

[0029] In the embodiment of the present application, the circuit board 5 can be a FPC flexible circuit board, and the square shell 311 design allows the circuit board 5 to be completely attached to the surface of the shell 311, making assembly more convenient.

[0030] In the embodiment of the present application, the driving system 312 comprises a fixed claw pole 3121 fixed to the inner periphery of the shell 311 and arranged around the rotor 4, and a winding 3122 sleeved and fixed to the fixed claw pole 3121, the winding 3122 is electrically connected to the circuit board 5.

[0031] The side of the shell 311 attached to the circuit board 5 is provided with a leakage hole 3111 penetrating therethrough, and the lead 31221 of the winding 3122 extends outward through the leakage hole 3111 and is electrically connected to the circuit board 5.

[0032] The circuit board 5 comprises a circuit board body 51 fixed to the shell 311 and a plurality of welding portions 52 arranged on the side of the circuit board body 51 away from the shell 311, the circuit board body 51 is provided with a plurality of through holes 53, the lead 31221 of the winding 3122 passes through the through hole 53 and is welded to the welding portion 52.

[0033] Specifically, through the design of the leakage hole 3111 on the shell 311 and the through hole 53 on the circuit board 5, the lead 31221 of the winding 3122 can be simply extended to the welding portion 52 and electrically connected, combined with the complete fitting design of the square shell 311 and the circuit board 5, the occupancy rate of the wire-out structure in the motor installation space can be greatly reduced.

[0034] In the embodiment of the application, the stepping motor 100 further comprises a plurality of wire sealing glue 6 arranged on the side of the circuit board 5 away from the shell 311, and the wire sealing glue 6 completely covers the welding portion 52.

[0035] The use of the wire sealing glue 6 can ensure the stability of the welding of the lead 31221.

[0036] The fixed claw pole 3121 comprises a first claw pole half 31211 and a second claw pole half 31212 oppositely fixed in the shell 311 and matched with each other, and the winding 3122 is simultaneously sleeved and fixed to the first claw pole half 31211 and the second claw pole half 31212.

[0037] The stepping motor 100 further comprises a first gasket 7 and a second gasket 8 sleeved on the rotating shaft 41, and the first gasket 7 and the second gasket 8 are respectively fixed to the two ends of the magnetic steel 42.

[0038] The stepping motor 100 further comprises a first bearing 9 and a second bearing 10, the first bearing 9 is sleeved on one end of the rotating shaft 41 close to the first cover plate 1 and is embedded and fixed to the first cover plate 1, and the second bearing 10 is sleeved on one end of the rotating shaft 41 close to the second cover plate 2 and is embedded and fixed to the second cover plate 2.

[0039] The magnetic steel 42 comprises a plurality of sub-magnetic steels 421 arranged along the circumference of the rotating shaft 41, and the polarities of the plurality of sub-magnetic steels 421 are the same or oppositely arranged.

[0040] In the embodiment of the application, the shell 311 is made of a magnetic conductive material.

[0041] Specifically, in order to accommodate the fixing claw pole 3121 and the winding 3122, the inner circumferential side of the shell 311 maintains a circular structure, and compared with the shell with a circular outer circumferential side in the related art, the bending strength of the square-shaped shell 311 in the embodiment of the application is higher, and the installation space of the motor in the whole square shape is more controllable, the volume of the shell 311 is larger, and when the shell 311 is made of a magnetically conductive material, the motor torque can be improved, and the effect of improving torque fluctuation is achieved, thereby improving the motor performance.

[0042] Compared with the related art, in the stepping motor of the application, the first cover plate, the second cover plate spaced from the first cover plate, the stator and the rotor clamped between the first cover plate and the second cover plate, the rotor including a rotating shaft and a magnetic steel sleeved and fixed to the rotating shaft, both ends of the rotating shaft are supported on the first cover plate and the second cover plate respectively and form a rotating connection with the first cover plate and the second cover plate respectively, and the stator surrounds the rotor and is spaced from the rotor; the stator includes at least two driving units distributed along the axial direction of the rotor, each driving unit includes a ring-shaped shell coaxially arranged with the rotating shaft and a driving system fixed to the inner side of the shell; the outer circumferential side of the shell is square-shaped, and the inner circumferential side of the shell is circular-shaped, all the shells are sequentially stacked along the axial direction of the rotating shaft and clamped between the first cover plate and the second cover plate; the stepping motor further includes a circuit board, the circuit board is fixedly attached to the outer circumferential side of the shell and extends along the axial direction of the rotating shaft, and the driving system is electrically connected with the circuit board. In the above structure, the shell of the stepping motor is square-shaped, which significantly improves the bending strength of the device, and compared with the circular shell, the magnetic circuit is also increased, which can further improve the motor torque, and the square-shaped shell facilitates the attachment of the circuit board, which can reduce the occupancy rate of the wire structure to the overall space of the motor.

[0043] The above only describes the embodiments of the application, and it should be noted that those skilled in the art can make improvements without departing from the inventive concept, and these all belong to the protection scope of the application.

Claims

1. A stepper motor comprising a first cover plate, a second cover plate spaced opposite to the first cover plate, a stator and a rotor sandwiched between the first cover plate and the second cover plate, the rotor comprising a rotating shaft and a magnetic steel sleeved and fixed to the rotating shaft, both ends of the rotating shaft being supported on the first cover plate and the second cover plate respectively and rotatably connected to the first cover plate and the second cover plate respectively, the stator being arranged around the rotor and spaced from the rotor; characterized in that the stator comprises at least two driving units distributed along the axial direction of the rotor, each of the driving units comprising a ring-shaped housing coaxially arranged on the rotating shaft and a driving system fixed to the inner side of the housing; the outer periphery of the housing is square-shaped and the inner periphery of the housing is circular-shaped, and all the housings are sequentially stacked along the axial direction of the rotating shaft and sandwiched between the first cover plate and the second cover plate. The stepper motor further comprises a circuit board fixedly attached to the outer periphery of the housing and extending along the axial direction of the rotating shaft, and the driving system is electrically connected to the circuit board. The driving system comprises a fixed claw pole fixed to the inner periphery of the housing and arranged around the rotor, and a winding sleeved and fixed to the fixed claw pole, and the winding is electrically connected to the circuit board.

2. The stepper motor of claim 1, wherein, The side of the housing attached to the circuit board is provided with a leakage hole penetrating therethrough, and the lead of the winding extends outward through the leakage hole and is electrically connected to the circuit board.

3. The stepper motor of claim 2, wherein, The circuit board comprises a circuit board body fixed to the housing and a plurality of welding portions provided on the side of the circuit board body away from the housing, and the circuit board body is provided with a plurality of through holes penetrating therethrough, and the lead of the winding passes through the through holes and is welded to the welding portions.

4. The stepper motor of claim 3, wherein, The stepper motor further comprises a plurality of wire sealing adhesives attached to the side of the circuit board away from the housing, and the wire sealing adhesives completely cover the welding portions.

5. The stepper motor of claim 4, wherein, The fixed claw pole comprises a first claw pole half and a second claw pole half fixed to the inner side of the housing and cooperated with each other, and the winding is sleeved and fixed to the first claw pole half and the second claw pole half.

6. The stepper motor of claim 2, wherein, The stepper motor further comprises a first gasket and a second gasket sleeved on the rotating shaft, and the first gasket and the second gasket are fixed to both ends of the magnetic steel respectively.

7. The stepper motor of claim 1, wherein, The stepper motor further comprises a first bearing and a second bearing, the first bearing is sleeved on one end of the rotating shaft close to the first cover plate and embeddedly fixed to the first cover plate, and the second bearing is sleeved on one end of the rotating shaft close to the second cover plate and embeddedly fixed to the second cover plate.

8. The stepper motor of claim 1, wherein, The magnetic steel comprises a plurality of sub-magnetic steels arranged along the circumferential direction of the rotating shaft, and the polarities of the plurality of sub-magnetic steels are the same or alternately opposite.

9. The stepper motor of claim 1, wherein, The housing is made of magnetic conductive material.

10. The stepper motor of claim 1, wherein, ​

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