Stepping motor

Abstract

The invention provides a stepping motor, which comprises a shell, a stator assembly fixed on the shell and a rotor assembly supported on the shell and rotationally connected with the shell, and is characterized in that the stator assembly is arranged around the rotor assembly and is spaced from the rotor assembly; the rotor assembly comprises a rotating shaft and magnetic steel fixedly sleeving the rotating shaft. The two ends of the rotating shaft are rotationally connected with the shell. The stator assemblies are fixed to the shell, and the stator assemblies are arranged on the rotor assembly in a sleeving mode and arranged in the axial direction of the rotating shaft. The stepping motor further comprises a gasket, the gasket is fixed to the rotating shaft in a sleeving mode, the outer diameter of the gasket is larger than the diameter of the rotating shaft, the peripheral side of the gasket abuts against the magnetic steel so that a glue filling gap can be formed between the magnetic steel and the rotating shaft, and the glue filling gap is filled with glue. Compared with the prior art, the stepping motor controls the radial gap between the magnetic steel and the rotating shaft through the gasket, and further controls the gluing amount of the magnetic steel and the rotating shaft, so that the gluing strength can be ensured, and the performance and the stability of the stepping motor are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stepping motor. Background Art

[0002] Stepper motors have been widely used in the fields of motors and generators due to their compact structure, high power density, high working efficiency, and significant energy saving and consumption reduction benefits. In recent years, the industrial field has an increasingly urgent demand for equipment that uses stepper motors to directly drive loads. The widespread use of these stepper motor direct-drive equipment will produce immeasurable energy-saving benefits.

[0003] In existing stepper motors, since the magnets and the shaft are directly fitted radially, there is a risk of poor bonding between the magnets and the shaft, which weakens the bonding strength between the magnets and the shaft and deteriorates the stability, thereby affecting the performance and stability of the stepper motor.

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

[0005] The purpose of the present invention is to provide a stepping motor, aiming to solve the problem of poor bonding caused by direct radial bonding between the magnetic steel and the rotating shaft in the existing stepping motor.

[0006] In order to achieve the above object, the present invention provides a stepper motor, the 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 the rotor assembly and spaced apart from the rotor assembly; The rotor assembly includes a rotating shaft and a magnetic steel sleeved and fixed on the rotating shaft, and both ends of the rotating shaft are respectively rotatably connected with the housing; The stator assembly includes a shell coaxially arranged with the shell and fixed to the shell, a claw pole assembly surrounding the outer circumference of the rotor assembly, and a coil sleeved on the claw pole assembly, and the claw pole assembly is accommodated and fixed in the shell; The stepper motor also includes a washer, which is sleeved and fixed on the rotating shaft and has an outer diameter greater than the diameter of the rotating shaft. The outer peripheral side of the washer abuts against the magnetic steel to form a glue-filled gap between the magnetic steel and the rotating shaft, and the glue-filled gap is filled with glue.

[0007] Preferably, the rotating shaft comprises a rotating shaft body and an annular mounting groove formed by the rotating shaft body being recessed radially inward, and the gasket is sleeved in the mounting groove.

[0008] Preferably, the washers include at least two, and all the washers are arranged at intervals along the axial direction of the rotating shaft.

[0009] Preferably, the stator assembly includes a plurality of stators and are respectively fixed to the housing, and the plurality of stator assemblies are respectively sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft.

[0010] Preferably, the stepper motor further comprises a circuit board, which is fixed to the housing along the axial direction of the rotating shaft, and the wire ends at both ends of the coil extend out of the housing and are connected to the circuit board respectively. Preferably, the stator assembly further comprises an isolation film, wherein the isolation film is sleeved on the outer peripheral side of the claw pole assembly, and the coil is sleeved on the isolation film.

[0011] Preferably, the shell comprises a first cover plate and a second cover plate which are arranged opposite to each other along the axial direction of the rotating shaft, the outer shell is clamped between the first cover plate and the second cover plate, and both ends of the rotating shaft are rotatably connected with the first cover plate and the second cover plate respectively.

[0012] Preferably, the stepper motor further includes a first bearing and a second bearing, the first bearing being sleeved on one end of the rotating shaft close to the first cover plate and embedded and fixed in the first cover plate, and the second bearing being sleeved on one end of the rotating shaft close to the second cover plate and embedded and fixed in the second cover plate.

[0013] Preferably, the stepper motor further comprises a first gasket and a second gasket which are arranged at a relative interval, the first gasket and the second gasket are sleeved on the rotating shaft, and the first gasket and the second gasket are respectively fixed to two ends of the magnetic steel.

[0014] Preferably, the magnetic steel includes a plurality of magnetic steels, the magnetic steels extend along the axial direction of the rotating shaft, and the plurality of magnetic steels form a ring along the circumference of the rotating shaft and are fixed to the outer peripheral side of the rotating shaft by glue.

[0015] Compared with the prior art, the stepper motor of the present invention controls the radial clearance between the magnetic steel and the rotating shaft through the gasket, thereby controlling the bonding amount between the magnetic steel and the rotating shaft, thereby ensuring the bonding strength and improving the performance and stability of the stepper motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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 work, among which: Figure 1 A schematic diagram of the three-dimensional structure of a stepping motor provided in the first embodiment of the present invention; Figure 2A schematic diagram of a three-dimensional structure decomposition of a stepping motor provided in the first embodiment of the present invention; Figure 3 For along Figure 1 Sectional view along line AA; Figure 4 A cross-sectional view of a stepping motor provided in Embodiment 2 of the present invention; Figure 5 A cross-sectional view of a stepping motor provided in Embodiment 3 of the present invention; Figure 6 for Figure 5 A partial enlarged view of the portion shown in D.

[0017] In the figure, 100, stepper motor, 1, housing, 11, first cover plate, 12, second cover plate, 2, rotor assembly, 21, rotating shaft, 211, rotating shaft body, 212, mounting groove, 22, magnetic steel, 3, stator assembly, 31, housing, 311, surrounding wall, 32, claw pole assembly, 321, first claw pole, 322, second claw pole, 33, coil, 34, isolation film, 4, gasket, 5, circuit board, 61, first bearing, 62, second bearing, 71, first gasket, 72, second gasket. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Combination Figure 1 to Figure 2 As shown, an embodiment of the present invention provides a stepper motor 100, the stepper motor 100 includes a housing 1, a stator assembly 3 fixed to the housing 1, and a rotor assembly 2 supported by the housing 1 and rotatably connected to the housing 1, the stator assembly 3 is arranged around the rotor assembly 2 and is spaced apart from the rotor assembly 2; The rotor assembly 2 includes a rotating shaft 21 and a magnetic steel 22 sleeved and fixed on the rotating shaft 21, and both ends of the rotating shaft 21 are respectively rotatably connected with the housing 1; The stator assembly 3 includes a housing 31 coaxially arranged with the housing 1 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, and the claw pole assembly 32 is accommodated and fixed in the housing 31; The stepper motor 100 further includes a washer 4, which is sleeved and fixed on the rotating shaft 21 and has an outer diameter greater than the diameter of the rotating shaft 21. The outer peripheral side of the washer 4 abuts against the magnetic steel 22 to form a glue-filled gap between the magnetic steel 22 and the rotating shaft 21, and the glue-filled gap is filled with glue.

[0020] Specifically, the washer 4 can effectively control the gap between the magnetic steel 22 and the rotating shaft 21 , thereby controlling the amount of glue between the magnetic steel 22 and the rotating shaft 21 , thereby ensuring the bonding strength and improving the performance and stability of the stepper motor 100 .

[0021] In this embodiment, the rotating shaft 21 includes a rotating shaft body 211 and an annular mounting groove 212 formed by the rotating shaft body 211 being recessed radially inward, and the washer 4 is sleeved in the mounting groove 212. Through the mounting groove 212, the washer 4 can be better sleeved and assembled with the rotating shaft 21, saving space while improving the stability of the connection between the washer 4 and the rotating shaft 21.

[0022] In this embodiment, the washers 4 include at least two washers 4 sleeved between the rotating shaft 21 and the magnetic steel 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 actual conditions.

[0023] In this embodiment, the washer 4 is in a circular ring shape, so that the contact between the washer 4 and the rotating shaft 21 and the magnetic steel 22 is more stable.

[0024] In an embodiment of the present invention, the stator assembly 3 includes multiple stators 3 and is respectively fixed to the housing 1. 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 the multiple here refers to two or more.

[0025] 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 ends of both ends of the coil 33 extend outside the housing 1 and are connected to the circuit board 5 . In this embodiment, the stator assembly 3 further includes an isolation film 34, which is sleeved on the outer peripheral side of the claw pole assembly 32, and the coil 33 is sleeved on the isolation film 34. The isolation film 34 can effectively block the claw pole assembly 32 and the coil 33, thereby improving the stability of the stepper motor 100.

[0026] 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 housing 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 respectively connected to the first cover plate 11 and the second cover plate 12 to form a rotation connection. Optionally, the stepping motor 100 further includes a surrounding wall 311 formed by all the housings 31 abutting against each other. The surrounding wall 311 is sandwiched between the first cover plate 11 and the second cover plate 12.

[0027] In this embodiment, the stepper motor 100 also includes a first bearing 61 and a second bearing 62. The first bearing 61 is sleeved on one end of the rotating shaft 21 close to the first cover plate 11 and is embedded and fixed in the first cover plate 11. The second bearing 62 is sleeved on one end of the rotating shaft 21 close to the second cover plate 12 and is embedded and fixed in the second cover plate 12.

[0028] In this embodiment, the stepper motor 100 further includes a first gasket 71 and a second gasket 72 which are arranged relatively at an interval. The first gasket 71 and the second gasket 72 are sleeved on the rotating shaft 21 , and the first gasket 71 and the second gasket 72 are respectively fixed to two ends of the magnetic steel 22 .

[0029] In this embodiment, the magnetic steel 22 includes a plurality of magnetic steels 22 , which extend along the axial direction of the rotating shaft 21 , and the plurality of magnetic steels 22 form a ring along the circumference of the rotating shaft 21 and are fixed to the outer peripheral side of the rotating shaft 21 by glue.

[0030] In this embodiment, the claw pole assembly 32 includes a first claw pole 321 and a second claw pole 322 that are cooperatively connected to each other.

[0031] In addition to the above-mentioned embodiment in which the gasket 4 is directly sleeved and fixed on the rotating shaft 21, the present invention also provides another embodiment in which the gasket 4 and the rotating shaft 21 are assembled. Figure 3 As shown, the gasket 4 includes two gaskets respectively sleeved on both sides of the rotating shaft 21 and abutting against the magnetic steel 22. The rotating shaft 21 includes a rotating shaft body 211 and two mounting grooves 212. The two gaskets 4 are respectively fixed on the two mounting grooves 212. The outer peripheral side of the gasket 4 abuts against the magnetic steel 22 so that a glue-filled gap is formed between the magnetic steel 22 and the rotating shaft 21. The glue-filled gap is filled with glue. The gasket 4 can effectively control the glue-filled gap between the magnetic steel 22 and the rotating shaft 21, and then control the amount of glue bonded between the magnetic steel 22 and the rotating shaft 21, so as to ensure the bonding strength and improve the performance and stability of the stepper motor 100.

[0032] In addition to the above-mentioned embodiment in which the gasket 4 is directly sleeved and fixed on the rotating shaft 21, the present invention also provides another embodiment in which the gasket 4 and the rotating shaft 21 are assembled. Figure 4 As shown, the washers 4 include three, and are sleeved on the rotating shaft 21 at intervals and abut against the magnetic steel 22. The rotating shaft 21 includes a rotating shaft body 211 and three mounting grooves 212. The three washers 4 are respectively fixed on the three mounting grooves 212. The outer peripheral side of the washers 4 abuts against the magnetic steel 22 so that a glue-filled gap is formed between the magnetic steel 22 and the rotating shaft 21. The glue-filled gap is filled with glue. The washers 4 can effectively control the glue-filled gap between the magnetic steel 22 and the rotating shaft 21, and then control the amount of glue between the magnetic steel 22 and the rotating shaft 21, so as to ensure the bonding strength and improve the performance and stability of the stepper motor 100.

[0033] In addition to the above-mentioned embodiment in which the gasket 4 is directly sleeved and fixed on the rotating shaft 21, the present invention also provides another embodiment in which the gasket 4 and the rotating shaft 21 are assembled. Figure 5-Figure 6 As shown, the washers 4 include two washers, which are respectively sleeved on opposite sides of the rotating shaft 21 and abut against the magnetic steel 22, and the rotating shaft 21 is not provided with a mounting groove 212. The outer peripheral side of the washers 4 abuts against the magnetic steel 22 so that a glue-filled gap is formed between the magnetic steel 22 and the rotating shaft 21, and the glue-filled gap is filled with glue. The washers 4 can effectively control the glue-filled gap between the magnetic steel 22 and the rotating shaft 21, and then control the glue amount of the magnetic steel 22 and the rotating shaft 21, so as to ensure the bonding strength and improve the performance and stability of the stepper motor 100.

[0034] Compared with the prior art, the stepper motor of the present invention controls the radial clearance between the magnetic steel and the rotating shaft through the gasket, thereby controlling the bonding amount between the magnetic steel and the rotating shaft, thereby ensuring the bonding strength and improving the performance and stability of the stepper motor. The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

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, wherein the stator assembly is disposed around the rotor assembly and is spaced apart from the rotor assembly; The rotor assembly comprises a rotating shaft and a magnetic steel sleeved and fixed on the rotating shaft, and both ends of the rotating shaft are respectively rotatably connected with the housing; The stator assembly comprises a shell coaxially arranged with the shell and fixed to the shell, a claw pole assembly surrounding the outer circumference of the rotor assembly and a coil sleeved on the claw pole assembly, and the claw pole assembly is accommodated and fixed in the shell; it is characterized in that, The stepper motor also includes a washer, which is sleeved and fixed on the rotating shaft and has an outer diameter greater than the diameter of the rotating shaft. The outer peripheral side of the washer abuts against the magnetic steel to form a glue-filled gap between the magnetic steel and the rotating shaft, and the glue-filled gap is filled with glue.

2. The stepper motor according to claim 1, characterized in that: The rotating shaft comprises a rotating shaft body and an annular mounting groove formed by the rotating shaft body being recessed inwardly along the radial direction, and the washer is sleeved in the mounting groove.

3. The stepper motor according to claim 1, characterized in that: The washers include at least two, and all the washers are arranged at intervals along the axial direction of the rotating shaft.

4. The stepper motor according to claim 1, characterized in that: The stator assembly includes a plurality of stators which are respectively fixed to the housing. The plurality of stator assemblies are respectively sleeved on the rotor assembly and arranged along the axial direction of the rotating shaft.

5. The stepping motor according to claim 1, characterized in that: The stepper motor further includes a circuit board, which is fixed to the housing along the axial direction of the rotating shaft. The ends of both ends of the coil extend out of the housing and are connected to the circuit board.

6. The stepper motor according to claim 1, characterized in that: The stator assembly further includes an isolation film, which is sleeved on the outer peripheral side of the claw pole assembly, and the coil is sleeved on the isolation film.

7. The stepper motor according to claim 1, characterized in that: The shell includes a first cover plate and a second cover plate which are 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 both ends of the rotating shaft are rotatably connected with the first cover plate and the second cover plate respectively.

8. The stepping motor according to claim 7, characterized in that: The stepper motor also includes 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 embedded and fixed to the first cover plate. The second bearing is sleeved on one end of the rotating shaft close to the second cover plate and embedded and fixed to the second cover plate.

9. The stepper motor according to claim 1, characterized in that: The stepper motor further includes a first gasket and a second gasket which are arranged at a relative interval, the first gasket and the second gasket are sleeved on the rotating shaft, and the first gasket and the second gasket are respectively fixed to two ends of the magnetic steel.

10. The stepper motor according to claim 1, characterized in that: The magnetic steel includes a plurality of magnetic steels, and the magnetic steels extend along the axial direction of the rotating shaft. The plurality of magnetic steels form a ring along the circumferential direction of the rotating shaft and are fixed to the outer peripheral side of the rotating shaft by glue.

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