Stepper motor

Abstract

The present invention relates to the technical field of motors. Provided is a stepper motor, which comprises a housing, stator assemblies, and a rotor assembly; the rotor assembly comprises a rotating shaft and a magnetic steel sleeved on and fixed to the rotating shaft, and an end of the rotating shaft is rotatably connected to the housing; the stator assemblies are each sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft; each stator assembly comprises an outer housing, a fixed claw pole, and a winding sleeved on the fixed claw pole, the fixed claw pole being accommodated and fixed in the outer housing; each outer housing comprises an outer housing main body and an incline angle structure portion formed by depressing an outer periphery of the outer housing main body; a circuit board is attached and fixed to the side of each outer housing main body away from the rotor assembly, and the orthographic projection of the circuit board in a direction toward the rotor assembly at least partially falls within the range of the incline angle structures, each incline angle structure portion being provided with a clearance hole, and a lead wire of each winding extending from a clearance hole and being electrically connected to the circuit board. Compared with the existing technology, the stepper motor of the present invention facilitates the economization of space for mounting the leads of the windings and reduction in the width space for stacking in the entire machine.

Description

Stepping motor TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stepping motor. BACKGROUND

[0002] Stepping motors have been widely used in the fields of electric motors and generators due to their compact structure, high power density, high work efficiency, and significant energy saving and consumption reduction benefits. In recent years, there is an increasing demand for devices that directly drive loads using stepping motors in the industrial field. The widespread use of these stepping motor direct drive devices will bring immeasurable energy saving benefits. TECHNICAL PROBLEM

[0003] In related technologies, most existing stepping motors are claw pole type permanent magnet stepping motors. A stepping motor includes a rotor and a stator spaced around the rotor. The motor rotates by mutual driving of the stator and the rotor. The stator includes a housing, claw-shaped magnetic poles fixed in the housing, and windings around the claw-shaped magnetic poles. The rotor generally includes a shaft and 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 mutual driving of the magnetic steel and the windings. However, the external shape of the existing housing is generally circular, and the outgoing lines of the windings are connected to the external circuit board in the form of a pin winding. This increases the width space of the product when the whole machine is stacked, occupies the overall space of the stepping motor, and results in poor user experience.

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

[0005] The purpose of the present application is to provide a stepping motor with a simple structure, which saves the installation space of the lead wires of the windings and reduces the stacking width space of the whole machine.

[0006] To achieve the above purpose, the present application provides a stepping motor, which includes a housing, a stator assembly fixed to the housing, and a rotor assembly supported on the housing and in rotational connection with the housing. The stator assembly is arranged around the rotor assembly and spaced from the rotor assembly.

[0007] The rotor assembly includes a shaft and a magnetic steel fixed around the shaft. The end of the shaft is in rotational connection with the housing.

[0008] The stator assembly includes a plurality of stator assemblies fixed to the housing, and each of the stator assemblies is sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft; each of the stator assemblies includes an outer shell coaxially arranged with the housing and fixed to the housing, a fixed claw pole arranged around the outer periphery of the rotor assembly, and a winding sleeved on the fixed claw pole, the fixed claw pole being accommodated in the outer shell; the outer shell includes an outer shell body fixed to the housing and an inclined structure part formed by partially recessing the outer periphery of the outer shell body towards the rotor assembly.

[0009] The stepping motor further includes a circuit board fixed to one side of the outer shell body away from the rotor assembly, and the orthographic projection of the circuit board towards the rotor assembly at least partially falls within the range of the inclined structure part, the inclined structure part is provided with a clearance hole, and the lead of the winding extends out of the clearance hole and is electrically connected with the circuit board.

[0010] Preferably, the circuit board includes a circuit board body and a solder pad part formed by bending and extending at least one side of the circuit board body, the circuit board body is fixedly attached to the outer shell, and the orthographic projection of the solder pad part towards the rotor assembly falls within the range of the inclined structure part.

[0011] Preferably, the outer shell includes an outer shell bottom fixed to the housing and an outer shell side wall bent and extended from the outer periphery of the outer shell bottom, the outer shell bottom includes an arc-shaped edge, two parallel edges extending from both ends of the arc-shaped edge, a first flat edge opposite to the arc-shaped edge and spaced from the two parallel edges, a second flat edge and a third flat edge respectively bent and extended from both ends of the first flat edge to the two parallel edges, the outer shell side wall includes a first arc-shaped side wall extending along the axial direction of the rotating shaft from the arc-shaped edge, a parallel side wall extending along the axial direction of the rotating shaft from the parallel edge, a first side wall, a second side wall and a third side wall respectively extending along the axial direction of the rotating shaft from the first flat edge, the second flat edge and the third flat edge, the circuit board body is fixedly attached to the first side wall, and the second side wall and the third side wall respectively serve as the two inclined structure parts.

[0012] Preferably, the lead of the winding is fixedly connected with the circuit board by being adhered to one side of the solder pad part away from the rotor assembly.

[0013] Preferably, the fixed claw pole includes a first claw pole and a second claw pole fixed to the outer shell and matched with each other, and the winding is sleeved and fixed to the first claw pole and the second claw pole.

[0014] Preferably, the stepping motor further comprises a gap piece, the gap piece is in a ring structure, the gap piece is sleeved and fixed to the fixed claw pole, and the winding is sleeved and fixed to the gap piece.

[0015] Preferably, the stepping motor further comprises two spacers arranged oppositely, the two spacers are sleeved to the rotating shaft, and the two spacers are respectively fixed to two ends of the magnetic steel.

[0016] Preferably, the shell comprises a first cover plate and a second cover plate arranged oppositely, the first cover plate and the second cover plate are respectively fixed to two ends of the shell, and two ends of the rotating shaft are respectively rotationally connected to the first cover plate and the second cover plate.

[0017] Preferably, the stepping motor further comprises a first bearing and a second bearing, the first bearing is sleeved to 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 to one end of the rotating shaft close to the second cover plate and is embeddedly fixed to the second cover plate. Beneficial effects

[0018] Compared with the prior art, in the stepping motor, the stator assembly is arranged around and spaced from the rotor assembly; the rotor assembly comprises a rotating shaft and a magnetic steel sleeved and fixed to the rotating shaft, and the end of the rotating shaft is rotationally connected to the shell; the stator assembly comprises a plurality of stator assemblies fixed to the shell, the plurality of stator assemblies are respectively sleeved to the rotor assembly and arranged along the axial direction of the rotating shaft; each stator assembly comprises a shell coaxially arranged with the shell and fixed to the shell, a fixed claw pole arranged around the outer periphery of the rotor assembly, and a winding sleeved to the fixed claw pole, and the fixed claw pole is accommodated and fixed in the shell; the shell comprises a shell body fixed to the shell and an inclined structure part locally recessed from the outer periphery of the shell body towards the direction close to the rotor assembly; the circuit board is fixedly attached to one side of the shell body away from the rotor assembly, and the orthographic projection of the circuit board towards the rotor assembly at least partially falls into the range of the inclined structure part, the inclined structure part is provided with a clearance hole, the lead of the winding extends out of the clearance hole and is electrically connected to the circuit board; the circuit board is directly attached and fixed to the shell, meanwhile, the installation space of the lead of the winding and the circuit board is saved, the width space of the stepping motor when stacked is reduced, and the miniaturization design is facilitated. 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 creative labor, wherein:

[0020] Fig. 1 is a perspective structural schematic view of a stepping motor according to an embodiment of the present application;

[0021] Fig. 2 is a perspective structural exploded view of the stepping motor according to an embodiment of the present application;

[0022] Fig. 3 is a sectional view along line A-A of Fig. 1;

[0023] Fig. 4 is a sectional view along line B-B of Fig. 1;

[0024] Fig. 5 is a structural schematic view of a housing according to an embodiment of the present application. Embodiments of the present application

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0026] According to the embodiments of the present application shown in Figs. 1 to 5, a stepping motor 100 is provided, which includes a housing 1, a stator assembly 2 fixed to the housing 1, and a rotor assembly 3 supported on the housing 1 and rotationally connected with the housing 1, the stator assembly 2 being arranged around the rotor assembly 3 and spaced from the rotor assembly 3. The stator assembly 2 and the rotor assembly 3 are driven to rotate the rotor assembly 3 on the housing 1, thereby realizing rotation of the motor.

[0027] The rotor assembly 3 includes a rotating shaft 31 and a magnetic steel 32 fixedly sleeved on the rotating shaft 31, and the end of the rotating shaft 31 is rotationally connected with the housing 1.

[0028] Optionally, the magnetic steel 32 is arranged along the circumference of the rotating shaft 31 to form a plurality of magnetic pole structures. The plurality of magnetic pole structures are arranged with the same polarity or with opposite polarities in an interlaced manner.

[0029] The stator assembly 2 includes a plurality of and is fixed to the shell 1, and the plurality of stator assemblies 2 are respectively sleeved on the rotor assembly 3 and arranged along the axial direction of the rotating shaft 31; each stator assembly 2 includes an outer shell 21 coaxially arranged with the shell 1 and fixed to the shell 1, a fixed claw pole 22 arranged around the outer periphery of the rotor assembly 3, and a winding 23 sleeved on the fixed claw pole 22, and the fixed claw pole 22 is accommodated and fixed in the outer shell 21; the outer shell 21 includes an outer shell body 211 fixed to the shell 1 and an inclined angle structure part 212 formed by partially recessing the outer periphery of the outer shell body 211 towards the direction close to the rotor assembly 3. The partial design of the inclined angle structure part 212 of the outer shell 21 does not affect the strength of the outer shell 21 and the internal magnetic circuit space.

[0030] The stepping motor 100 further includes a circuit board 4 fixedly attached to the outer shell body 211 away from the rotor assembly 3, and the orthographic projection of the circuit board 4 towards the rotor assembly 3 at least partially falls within the range of the inclined angle structure part 212, the inclined angle structure part 212 is provided with a relief hole 5, and the lead wire 231 of the winding 23 extends out of the relief hole 5 and is electrically connected with the circuit board 4. The relief hole 5 facilitates the lead wire 231 of the winding 23 to be connected with the circuit board 4, and saves the installation space. Directly attaching the circuit board 4 to the outer shell 21 facilitates assembly, and at the same time, saves the installation space of the lead wire 231 of the winding 23 and the circuit board 4, reduces the width space of the whole stepping motor 100 when stacked, and facilitates miniaturization design.

[0031] In the embodiment, the circuit board 4 includes a circuit board body 41 and a solder pad part 42 formed by bending and extending at least one side of the circuit board body 41, the circuit board body 41 is fixedly attached to the outer shell 21, and the orthographic projection of the solder pad part 42 towards the rotor assembly 3 falls within the range of the inclined angle structure part 212. By bending one side of the circuit board 4 to form the solder pad part 42, it is convenient to attach the circuit board 4 to different positions of the outer shell 21, facilitating assembly.

[0032] Optionally, the circuit board 4 is a FPC flexible circuit board, and the flexible structure facilitates assembly.

[0033] Optionally, the solder pad part 42 is formed on the side close to the rotor assembly 3 of the opposite two sides of the circuit board body 41, further increasing the attachment area of the solder pad part 42 and the outer shell 21, and improving the fixing effect of the circuit board 4 and the outer shell 21.

[0034] The shell 21 comprises a shell bottom 213 fixed to the shell 1 and a shell side wall 214 extending from the outer periphery of the shell bottom 213. The shell bottom 213 comprises an arc-shaped edge 2131, two parallel edges 2132 extending from the two ends of the arc-shaped edge 2131, a first flat edge 2133 opposite to the arc-shaped edge 2131 and spaced from the two parallel edges 2132, a second flat edge 2134 and a third flat edge 2135 respectively extending from the two ends of the first flat edge 2133 to the two parallel edges 2132. The shell side wall 214 comprises a first arc-shaped side wall 2144 extending from the arc-shaped edge 2131 along the axial direction of the rotating shaft 31, a parallel side wall extending from the parallel edge 2132 along the axial direction of the rotating shaft 31, a first side wall 2141, a second side wall 2142 and a third side wall 2143 respectively extending from the first flat edge 2133, the second flat edge 2134 and the third flat edge 2135 along the axial direction of the rotating shaft 31. The circuit board body is fixed to the first side wall 2141, the second side wall 2142 and the third side wall 2143 as two inclination structure portions.

[0035] In the embodiment, the lead wire 231 of the winding 23 is fixedly connected to the circuit board 4 through adhesion on the side of the pad portion 42 away from the rotor assembly 3. The pad portion 42 is attached to the position of the inclination structure portion 212, so that the lead wire 231 of the winding 23 is welded and adhered at the position, improving the fixing effect of the lead wire 231 and the circuit board 4. The lead wire 231 is adhered to the pad portion 42 of the circuit board 4, so that the lead wire 231 is sealed. By adjusting the wire outlet position at the inclination position of the shell 21, the wire outlet welding and sealing process do not increase the width size of the product, thereby further reducing the space limitation of application.

[0036] In the embodiment, the fixed claw pole 22 comprises a first claw pole 221 and a second claw pole 222 fixed to the shell 21 and matched with each other, and the winding 23 is sleeved and fixed to the first claw pole 221 and the second claw pole 222. The matching effect between the first claw pole 221 and the second claw pole 222 facilitates assembly.

[0037] In the embodiment, the step motor 100 further comprises a magnetic isolation sheet 6 in a ring structure, the magnetic isolation sheet 6 is sleeved and fixed to the fixed claw pole 22, and the winding 23 is sleeved and fixed to the magnetic isolation sheet 6. The magnetic isolation sheet 6 reduces the magnetic interference between the winding 23 and the fixed claw pole 22, improves the mutual driving performance of the winding 23 and the magnetic steel 32, and further improves the rotating performance of the step motor 100.

[0038] The step motor 100 further comprises two spacers 7 arranged opposite to each other, the two spacers 7 are sleeved on the rotating shaft 31, and the two spacers 7 are fixed to the two ends of the magnetic steel 32 respectively, so that the fixing performance of the magnetic steel 32 and the rotating shaft 31 is improved.

[0039] The shell 1 comprises a first cover plate 11 and a second cover plate 12 arranged opposite to each other, the first cover plate 11 and the second cover plate 12 are fixed to the two ends of the shell 21 respectively, and the two ends of the rotating shaft 31 are rotationally connected with the first cover plate 11 and the second cover plate 12 respectively.

[0040] The step motor 100 further comprises a first bearing 8 and a second bearing 9, the first bearing 8 is sleeved on one end of the rotating shaft 31 close to the first cover plate 11 and is embedded and fixed to the first cover plate 11, and the second bearing 9 is sleeved on one end of the rotating shaft 31 close to the second cover plate 12 and is embedded and fixed to the second cover plate 12, so that the rotating friction of the rotating shaft 31 is reduced and the rotating effect is improved.

[0041] Compared with the prior art, in the step motor, the stator assembly is arranged around and spaced from the rotor assembly; the rotor assembly comprises a rotating shaft and a magnetic steel sleeved and fixed on the rotating shaft, and the end of the rotating shaft is rotationally connected with the shell; the stator assembly comprises a plurality of stator assemblies fixed on the shell, and the plurality of stator assemblies are sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft; each stator assembly comprises an outer shell coaxially arranged on the shell and fixed on the shell, a fixed claw pole arranged around the outer periphery of the rotor assembly, and a winding sleeved on the fixed claw pole, and the fixed claw pole is accommodated in the outer shell; the outer shell comprises an outer shell body fixed on the shell and an inclined structure part formed by locally recessing the outer periphery of the outer shell body towards the direction close to the rotor assembly; the circuit board is fixed on the side of the outer shell body away from the rotor assembly, and the orthographic projection of the circuit board towards the rotor assembly at least partially falls into the range of the inclined structure part, the inclined structure part is provided with a clearance hole, the lead of the winding extends out of the clearance hole and is electrically connected with the circuit board; the circuit board is directly fixed on the outer shell, meanwhile, the installation space of the lead of the winding and the circuit board is saved, the width space of the whole step motor is reduced during stacking, and the miniaturization design is facilitated.

[0042] The above only describes the embodiments of the present application, and it should be pointed out that those skilled in the art can make improvements without departing from the concept of the present application, and these improvements are within the protection scope of the present application.

Claims

1. A stepper motor comprising a housing, a stator assembly fixed to the housing and a rotor assembly supported by the housing and rotatably connected to the housing, the stator assembly being arranged around and spaced from the rotor assembly; characterized in that, the rotor assembly comprises a rotor shaft and a magnetic steel fixed to the rotor shaft, the end of the rotor shaft being rotatably connected to the housing; the stator assembly comprises a plurality of stator assemblies fixed to the housing, the plurality of stator assemblies being arranged around the rotor assembly along the axial direction of the rotor shaft, each of the stator assemblies comprising an outer shell coaxially arranged with the housing and fixed to the housing, a fixed claw pole arranged around the outer periphery of the rotor assembly, and a winding arranged in the fixed claw pole, the fixed claw pole being received in the outer shell; the outer shell comprises an outer shell body fixed to the housing and an inclined structure part formed by the outer periphery of the outer shell body being partially recessed towards the rotor assembly; the stepper motor further comprises a circuit board, the circuit board being fixed to one side of the outer shell body away from the rotor assembly, and the orthographic projection of the circuit board towards the rotor assembly at least partially falls within the range of the inclined structure part, the inclined structure part is provided with a clearance hole, the lead of the winding extends out of the clearance hole and is electrically connected to the circuit board.

2. The stepper motor of claim 1, wherein, the circuit board comprises a circuit board body and a solder pad part formed by at least one side of the circuit board body being bent and extended, the circuit board body being fixed to the outer shell, and the orthographic projection of the solder pad part towards the rotor assembly falls within the range of the inclined structure part.

3. The stepper motor of claim 2, wherein, the outer shell comprises an outer shell bottom fixed to the housing and an outer shell side wall bent and extended from the outer periphery of the outer shell bottom, the outer shell bottom comprises an arc-shaped edge, two parallel edges extending from both ends of the arc-shaped edge, a first flat edge opposite to the arc-shaped edge and spaced from the two parallel edges, a second flat edge and a third flat edge bent and extended from both ends of the first flat edge to the two parallel edges respectively, the outer shell side wall comprises a first arc-shaped side wall extending along the axial direction of the rotor shaft from the arc-shaped edge, a parallel side wall extending along the axial direction of the rotor shaft from the parallel edge, a first side wall, a second side wall and a third side wall extending along the axial direction of the rotor shaft from the first flat edge, the second flat edge and the third flat edge respectively, the circuit board body is fixed to the first side wall, and the second side wall and the third side wall serve as two inclined structure parts respectively.

4. The stepper motor of claim 2, wherein, the lead of the winding is fixedly connected to the solder pad part away from the rotor assembly by adhesive.

5. The stepper motor of claim 1, wherein, the fixed claw pole comprises a first claw pole and a second claw pole oppositely fixed in the outer shell and cooperated with each other, and the winding is fixed to the first claw pole and the second claw pole.

6. The stepper motor of claim 1, wherein, the stepper motor further comprises a magnetic separation sheet, the magnetic separation sheet is in a ring structure, the magnetic separation sheet is fixed to the fixed claw pole, and the winding is fixed to the magnetic separation sheet.

7. The stepper motor of claim 1, wherein, The step motor further comprises two spacers oppositely arranged, the two spacers are sleeved on the rotating shaft, and the two spacers are respectively fixed on two ends of the magnetic steel.

8. The stepper motor of claim 1, wherein, The shell comprises a first cover plate and a second cover plate oppositely arranged, the first cover plate and the second cover plate are respectively fixed on two ends of the shell, and two ends of the rotating shaft are rotationally connected with the first cover plate and the second cover plate respectively.

9. The stepper motor of claim 8, wherein, The step 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 on 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 on the second cover plate.

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