Stepper motor

Abstract

The present invention provides a stepper motor, comprising a housing, stator assemblies fixed on the housing, and a rotor assembly supported on the housing and rotatably connected to the housing. The stator assemblies are disposed around the rotor assembly and are spaced apart from the rotor assembly; the rotor assembly comprises a rotating shaft and magnetic steel elements sleeved and fixed onto the rotating shaft, and two ends of the rotating shaft are separately rotatably connected to the housing; multiple stator assemblies are provided and are fixed on the housing, and the multiple stator assemblies are separately sleeved onto the rotor assembly and arranged in the axial direction of the rotating shaft. The stepper motor further comprises a washer; the washer is sleeved and fixed onto the rotating shaft, and the outer diameter of the washer is larger than the diameter of the rotating shaft; the peripheral side of the washer abuts against the magnetic steel elements, so that a glue-filling gap can be formed between the magnetic steel elements and the rotating shaft; and the glue-filling gap is filled with glue. Compared with the prior art, the stepper motor of the present invention controls the radial gap between the magnetic steel elements and the rotating shaft by means of the washer, and then controls the amount of glue for gluing the magnetic steel elements and the rotating shaft, thereby ensuring gluing strength and improving the performance and stability of the stepper motor.

Description

Stepper motor Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a stepper motor. Background Technology

[0002] Stepper motors are widely used in electric motors and generators due to their compact structure, high power density, high efficiency, and significant energy-saving benefits. In recent years, the industrial sector has seen an increasingly urgent demand for equipment that directly drives loads using stepper motors. The widespread application of these stepper motor direct-drive devices will generate immeasurable energy-saving benefits. Technical issues

[0003] Existing stepper motors have a risk of poor bonding between the magnet and the shaft due to the direct radial contact between the magnet and the shaft. This weakens the bond strength and reduces stability, thus affecting the performance and stability of the stepper motor.

[0004] Therefore, it is necessary to provide a new stepper motor to solve the above-mentioned technical problems. Technical solutions

[0005] The purpose of this invention is to provide a stepper motor that solves the problem of poor bonding caused by the direct radial contact between the magnet and the shaft in existing stepper motors.

[0006] To achieve the above objectives, the present invention provides a stepper motor, the stepper motor including a housing, a stator assembly fixed to the housing, and a rotor assembly supported on the housing and rotatably connected to the housing, the stator assembly being arranged around the rotor assembly and spaced apart from the rotor assembly;

[0007] The rotor assembly includes a rotating shaft and a magnet sleeved and fixed to the rotating shaft, with both ends of the rotating shaft respectively forming a rotatable connection with the housing;

[0008] The stator assembly includes a housing coaxially disposed and fixed to the housing, a claw pole assembly surrounding the outer periphery of the rotor assembly, and a coil sleeved on the claw pole assembly, wherein the claw pole assembly is housed and fixed inside the housing.

[0009] The stepper motor also includes a washer, which is sleeved and fixed to the rotating shaft and the outer diameter of the washer is larger than the diameter of the rotating shaft. The outer periphery of the washer abuts against the magnet, so that a glue-filled gap is formed between the magnet and the rotating shaft, and the glue-filled gap is filled with glue.

[0010] Preferably, the rotating shaft includes a rotating shaft body and an annular mounting groove formed by the radial inward recess of the rotating shaft body, and the washer is fitted into the mounting groove.

[0011] Preferably, the washer comprises at least two, and all the washers are arranged at intervals along the axial direction of the rotating shaft.

[0012] Preferably, the stator assembly comprises multiple stators, each fixed to the housing, and the multiple stator assemblies are respectively sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft.

[0013] Preferably, the stepper motor further includes a circuit board, which is fixed to the housing along the axial direction of the rotating shaft, and the two ends of the coil extend out of the housing and are connected to the circuit board.

[0014] Preferably, the stator assembly further includes an isolation film, which is sleeved on the outer periphery of the claw pole assembly, and the coil is sleeved on the isolation film.

[0015] Preferably, the housing includes a first cover plate and a second cover plate arranged opposite to each other along the axial direction of the rotating shaft, the outer shell is sandwiched between the first cover plate and the second cover plate, and the two ends of the rotating shaft are respectively rotatably connected to the first cover plate and the second cover plate.

[0016] Preferably, the stepper motor further includes a first bearing and a second bearing, wherein the first bearing is sleeved on one end of the rotating shaft near the first cover plate and embedded and fixed to the first cover plate, and the second bearing is sleeved on one end of the rotating shaft near the second cover plate and embedded and fixed to the second cover plate.

[0017] Preferably, the stepper motor further includes a first shim and a second shim that are spaced apart from each other, the first shim and the second shim being sleeved on the rotating shaft, and the first shim and the second shim being fixed to both ends of the magnet.

[0018] Preferably, the magnets include multiple magnets, which extend along the axial direction of the rotating shaft, and the multiple magnets are arranged in a ring around the circumference of the rotating shaft and fixed to the outer circumference of the rotating shaft with glue. Beneficial effects

[0019] Compared with the prior art, the stepper motor of the present invention controls the radial clearance between the magnet and the shaft by using washers, thereby controlling the amount of adhesive between the magnet and the shaft, thus ensuring the bonding strength and improving the performance and stability of the stepper motor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0021] Figure 1 is a three-dimensional structural diagram of the stepper motor provided in Embodiment 1 of the present invention;

[0022] Figure 2 is a three-dimensional exploded view of the stepper motor provided in Embodiment 1 of the present invention;

[0023] Figure 3 is a cross-sectional view along line AA in Figure 1;

[0024] Figure 4 is a cross-sectional view of the stepper motor provided in Embodiment 2 of the present invention;

[0025] Figure 5 is a cross-sectional view of the stepper motor provided in Embodiment 3 of the present invention;

[0026] Figure 6 is a magnified view of part D in Figure 5.

[0027] In the diagram, 100 is a stepper motor, 1 is a housing, 11 is a first cover plate, 12 is a second cover plate, 2 is a rotor assembly, 21 is a shaft, 211 is a shaft body, 212 is a mounting slot, 22 is a magnet, 3 is a stator assembly, 31 is a housing, 311 is a enclosure, 32 is a claw pole assembly, 321 is a first claw pole, 322 is a second claw pole, 33 is a coil, 34 is an insulating film, 4 is a washer, 5 is a circuit board, 61 is a first bearing, 62 is a second bearing, 71 is a first gasket, and 72 is a second gasket. Embodiments of the present invention

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Referring to Figures 1 and 2, an embodiment of the present invention provides a stepper motor 100, the stepper motor 100 including a housing 1, a stator assembly 3 fixed to the housing 1, and a rotor assembly 2 supported on the housing 1 and rotatably connected to the housing 1, the stator assembly 3 being arranged around the rotor assembly 2 and spaced apart from the rotor assembly 2;

[0030] The rotor assembly 2 includes a rotating shaft 21 and a magnet 22 sleeved and fixed to the rotating shaft 21. The two ends of the rotating shaft 21 are respectively rotatably connected to the housing 1.

[0031] The stator assembly 3 includes an outer shell 31 coaxially arranged with and fixed to the housing 1, a claw pole assembly 32 surrounding the outer periphery of the rotor assembly 2, and a coil 33 sleeved on the claw pole assembly 32. The claw pole assembly 32 is housed and fixed inside the outer shell 31.

[0032] The stepper motor 100 also includes a washer 4, which is sleeved and fixed to the rotating shaft 21 and the outer diameter of the washer 4 is larger than the diameter of the rotating shaft 21. The outer periphery of the washer 4 abuts against the magnet 22, so that a glue-filled gap is formed between the magnet 22 and the rotating shaft 21, and the glue-filled gap is filled with glue.

[0033] Specifically, the washer 4 can effectively control the glue filling gap between the magnet 22 and the rotating shaft 21, thereby controlling the amount of glue used to bond the magnet 22 and the rotating shaft 21, thus ensuring the bonding strength and improving the performance and stability of the stepper motor 100.

[0034] In this embodiment, the rotating shaft 21 includes a rotating shaft body 211 and an annular mounting groove 212 formed by the radial inward recess of the rotating shaft body 211. The washer 4 is fitted into the mounting groove 212. Through the mounting groove 212, the washer 4 can be better fitted and assembled with the rotating shaft 21, saving space and improving the stability of the connection between the washer 4 and the rotating shaft 21.

[0035] In this embodiment, the washers 4 include at least two that are sleeved between the rotating shaft 21 and the magnet 22, and all the washers 4 are arranged at intervals along the axial direction of the rotating shaft 21. Specifically, the number and material of the washers 4 can be set according to the actual situation.

[0036] In this embodiment, the washer 4 is annular, which makes the contact between the washer 4 and the rotating shaft 21 and the magnet 22 more stable.

[0037] In this embodiment of the invention, the stator assembly 3 includes multiple components and is fixed to the housing 1 respectively. The multiple stator assemblies 3 are respectively sleeved on the rotor assembly 2 and arranged along the axial direction of the rotating shaft 21. It should be noted that "multiple" here refers to two or more.

[0038] In this embodiment, the stepper motor 100 further includes a circuit board 5, which is fixed to the housing 1 along the axial direction of the rotating shaft 21, and the two ends of the coil 33 extend to the outside of the housing 1 and are connected to the circuit board 5.

[0039] In this embodiment, the stator assembly 3 further includes an isolation film 34, which is sleeved on the outer periphery of the claw pole assembly 32, and the coil 33 is sleeved on the isolation film 34. The isolation film 34 can effectively isolate the claw pole assembly 32 and the coil 33, thereby improving the stability of the stepper motor 100.

[0040] In this embodiment, the housing 1 includes a first cover plate 11 and a second cover plate 12 arranged axially opposite to the rotating shaft 21. The outer shell 31 is sandwiched between the first cover plate 11 and the second cover plate 12, and the two ends of the rotating shaft 21 are rotatably connected to the first cover plate 11 and the second cover plate 12, respectively. Optionally, the stepper motor 100 further includes a surrounding wall 311 formed by all the outer shells 31 abutting against each other. The surrounding wall 311 is sandwiched between the first cover plate 11 and the second cover plate 12.

[0041] In this embodiment, the stepper motor 100 further includes a first bearing 61 and a second bearing 62. The first bearing 61 is sleeved on the end of the rotating shaft 21 near the first cover plate 11 and is embedded and fixed to the first cover plate 11. The second bearing 62 is sleeved on the end of the rotating shaft 21 near the second cover plate 12 and is embedded and fixed to the second cover plate 12.

[0042] In this embodiment, the stepper motor 100 further includes a first shim 71 and a second shim 72 that are spaced apart from each other. The first shim 71 and the second shim 72 are sleeved on the rotating shaft 21 and the first shim 71 and the second shim 72 are respectively fixed to both ends of the magnet 22.

[0043] In this embodiment, the magnets 22 include a plurality of magnets, which extend along the axial direction of the rotating shaft 21. The plurality of magnets 22 are arranged in a ring around the circumference of the rotating shaft 21 and fixed to the outer circumference of the rotating shaft 21 with glue.

[0044] In this embodiment, the claw pole assembly 32 includes a first claw pole 321 and a second claw pole 322 that are connected to each other.

[0045] In addition to the embodiment described above where the washer 4 is directly fitted and fixed to the rotating shaft 21, the present invention also provides another embodiment of the assembly of the washer 4 and the rotating shaft 21. As shown in FIG3, the washer 4 includes two washeres respectively fitted on both sides of the rotating shaft 21 and abutting against the magnet 22. The rotating shaft 21 includes a rotating shaft body 211 and two mounting grooves 212, and the two washers 4 are respectively fixed on the two mounting grooves 212. The outer peripheral side of the washer 4 abuts against the magnet 22, forming a glue-filled gap between the magnet 22 and the rotating shaft 21. The glue-filled gap is filled with glue. The washer 4 can effectively control the glue-filled gap between the magnet 22 and the rotating shaft 21, thereby controlling the amount of glue used to bond the magnet 22 and the rotating shaft 21, thus ensuring the bonding strength and improving the performance and stability of the stepper motor 100.

[0046] In addition to the embodiment described above where the washer 4 is directly fitted and fixed to the rotating shaft 21, the present invention also provides another embodiment where the washer 4 and the rotating shaft 21 are assembled. As shown in FIG4, the washer 4 includes three washeres, which are fitted onto the rotating shaft 21 at intervals and abut against the magnet 22. The rotating shaft 21 includes a rotating shaft body 211 and three mounting grooves 212, and the three washer 4 are respectively fixed on the three mounting grooves 212. The outer peripheral side of the washer 4 abuts against the magnet 22, forming a glue-filled gap between the magnet 22 and the rotating shaft 21. The glue-filled gap is filled with glue. The washer 4 can effectively control the glue-filled gap between the magnet 22 and the rotating shaft 21, thereby controlling the amount of glue used to bond the magnet 22 and the rotating shaft 21, thus ensuring the bonding strength and improving the performance and stability of the stepper motor 100.

[0047] In addition to the embodiment described above where the washer 4 is directly fitted and fixed to the rotating shaft 21, the present invention also provides another embodiment where the washer 4 and the rotating shaft 21 are assembled. As shown in Figures 5 and 6, the washer 4 includes two washeres, which are respectively fitted onto opposite sides of the rotating shaft 21 and abut against the magnet 22. The rotating shaft 21 does not have a mounting groove 212. The outer periphery of the washer 4 abuts against the magnet 22, forming a glue-filled gap between the magnet 22 and the rotating shaft 21. The glue-filled gap is filled with glue. The washer 4 can effectively control the glue-filled gap between the magnet 22 and the rotating shaft 21, thereby controlling the amount of glue used to bond the magnet 22 and the rotating shaft 21, thus ensuring the bonding strength and improving the performance and stability of the stepper motor 100.

[0048] Compared with the prior art, the stepper motor of the present invention controls the radial clearance between the magnet and the shaft by using washers, thereby controlling the amount of adhesive between the magnet and the shaft, thus ensuring the bonding strength and improving the performance and stability of the stepper motor.

[0049] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A stepper motor, the stepper motor comprising a housing, a stator assembly fixed to the housing, and a rotor assembly supported on the housing and rotatably connected to the housing, the stator assembly being disposed around the rotor assembly and spaced apart from the rotor assembly; The rotor assembly includes a rotating shaft and a magnet sleeved and fixed to the rotating shaft, with both ends of the rotating shaft respectively forming a rotatable connection with the housing; The stator assembly includes a housing coaxially disposed and fixed to the housing, a claw pole assembly surrounding the outer periphery of the rotor assembly, and a coil sleeved on the claw pole assembly, wherein the claw pole assembly is housed and fixed within the housing; characterized in that, The stepper motor also includes a washer, which is sleeved and fixed to the rotating shaft and the outer diameter of the washer is larger than the diameter of the rotating shaft. The outer periphery of the washer abuts against the magnet, so that a glue-filled gap is formed between the magnet and the rotating shaft, and the glue-filled gap is filled with glue.

2. The stepper motor as described in claim 1, characterized in that, The rotating shaft includes a rotating shaft body and an annular mounting groove formed by the radial inward recess of the rotating shaft body, and the washer is fitted into the mounting groove.

3. The stepper motor as described in claim 1, characterized in that, The washer comprises at least two, and all the washers are arranged at intervals along the axial direction of the rotating shaft.

4. The stepper motor as described in claim 1, characterized in that, The stator assembly includes multiple components, each fixed to the housing, and the multiple stator components are respectively sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft.

5. The stepper motor as described in claim 1, characterized in that, The stepper motor also includes a circuit board, which is fixed to the housing along the axial direction of the rotating shaft, and the two ends of the coil extend out of the housing and are connected to the circuit board.

6. The stepper motor as described in claim 1, characterized in that, The stator assembly also includes an isolation film, which is sleeved on the outer periphery of the claw pole assembly, and the coil is sleeved on the isolation film.

7. The stepper motor as described in claim 1, characterized in that, The housing includes a first cover plate and a second cover plate arranged opposite each other along the axial direction of the rotating shaft. The outer shell is sandwiched between the first cover plate and the second cover plate, and the two ends of the rotating shaft are respectively rotatably connected to the first cover plate and the second cover plate.

8. The stepper motor as described in claim 7, characterized in that, The stepper motor further includes a first bearing and a second bearing. The first bearing is sleeved on one end of the rotating shaft near the first cover plate and is embedded and fixed to the first cover plate. The second bearing is sleeved on one end of the rotating shaft near the second cover plate and is embedded and fixed to the second cover plate.

9. The stepper motor as described in claim 1, characterized in that, The stepper motor also includes a first shim and a second shim that are spaced apart from each other. The first shim and the second shim are sleeved on the rotating shaft and fixed to both ends of the magnet, respectively.

10. The stepper motor as described in claim 1, characterized in that, The magnets include multiple magnets that extend along the axial direction of the rotating shaft. The multiple magnets are arranged in a ring around the circumference of the rotating shaft and fixed to the outer circumference of the rotating shaft with glue.

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