Linear stepping motor

Abstract

A linear stepping motor comprises a shell, a front end cover and a rear end cover, one end of the shell is provided with the front end cover, and the other end of the shell is provided with the rear end cover; the stator assembly comprises a stator main body and a pole plate group arranged outside the stator main body in a sleeving manner; the rotor assembly comprises a permanent magnet, a rotor shaft and a screw rod, the rotor shaft is sleeved with the permanent magnet, and the screw rod penetrates through the rotor shaft; and the terminal block comprises a leading-out wire and a wire protecting sleeve which is sleeved on the leading-out wire. The extending lead screw is stopped from rotating and limited through the rotation stopping shell arranged at the front end cover and the flat shape of the front end of the lead screw. The rotor assembly is sleeved with the rear end cover, the retracted lead screw is limited, the lead screw is effectively prevented from being separated from the motor, and normal use of the motor is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of stepping motors, in particular to a linear stepping motor. Background Art

[0002] A linear stepper motor is an open-loop control element that converts electrical pulse signals into linear displacement. Under normal circumstances, the motor's lead screw's movement speed and stopping position depend solely on the pulse signal's frequency and pulse count. If, for some reason, the lead screw's movement speed and position deviate from these parameters, resulting in abnormal lead screw movement, the motor will be minimally affected when the lead screw extends due to the limited position of the front cover. However, when the lead screw retracts, the rear cover has no limit, causing the lead screw to detach from the motor, affecting its normal operation.

[0003] It should be noted that the above information disclosed in this background technology section is only for understanding the background technology of the present invention concept, and therefore, it may contain information that does not constitute prior art. Summary of the Invention

[0004] Based on the above problems existing in the prior art, the problem to be solved by the present invention is: to provide a linear stepping motor, which solves the problem of unlimited position when the screw rod is retracted by setting a rear end cover mounted on the rotor assembly.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a linear stepping motor, comprising:

[0006] A housing, a front end cover, and a rear end cover, wherein the housing is provided with a front end cover at one end and a rear end cover at the other end;

[0007] A stator assembly, comprising a stator body and a pole plate assembly sleeved outside the stator body;

[0008] A rotor assembly, the rotor assembly comprising a permanent magnet, a rotor shaft, and a screw rod, wherein the permanent magnet is sleeved on the rotor shaft, and the screw rod passes through the rotor shaft;

[0009] A terminal block, comprising a lead wire and a wire protection sleeve sleeved on the lead wire;

[0010] The rotor assembly is arranged in the stator assembly, one end of the stator assembly is connected to the terminal block, the centers of the permanent magnet, rotor shaft and screw rod are on the same axis, and the rear end cover is sleeved on one end of the rotor assembly close to the terminal block.

[0011] Furthermore, it also includes a PCB board arranged on the inner side of the terminal block, the PCB board is ring-shaped, and the lead wire passes through the terminal block and is connected to the PCB board.

[0012] Furthermore, a rotation-stopping shell for limiting the front end of the screw rod is provided on the outer side surface of the front end cover, and a through hole for the screw rod to pass through is opened in the center of the rotation-stopping shell.

[0013] Furthermore, the screw rod is flat on one side of the front end cover, and the upper and lower surfaces are parallel planes.

[0014] Furthermore, the stator assembly is provided with at least two pole plate groups, and coil slots for winding are formed between the pole plate groups.

[0015] Furthermore, the rotor assembly further includes a first bearing and a second bearing, the first bearing being fixed in the front end cover, the second bearing being fixed in the rear end cover, and both ends of the rotor shaft being supported on the first bearing and the second bearing respectively.

[0016] Furthermore, the rotor shaft is provided with an axial through hole, the inner wall of the through hole is provided with threads, the screw rod passes through the rotor shaft, and the screw rod is connected to the threads on the inner wall of the rotor shaft through hole.

[0017] The beneficial effects of the utility model are as follows: the extended screw rod is stopped and limited by the anti-rotation shell provided at the front end cover and the flat front end of the screw rod; the retracted screw rod is limited by the rear end cover sleeved on the rotor assembly, effectively preventing the screw rod from detaching from the motor and ensuring the normal use of the motor; the stepper motor adopting this structure has a compact structure, good stability, high precision, simplifies the installation process, reduces the cost of motor installation, and is convenient for users to use.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present invention are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 It is the overall schematic diagram of the linear stepper motor;

[0021] Figure 2 is a schematic diagram of the stator assembly;

[0022] Figure 3 is a schematic diagram of the rotor assembly;

[0023] Figure 4 Schematic diagram of the rotor shaft.

[0024] In the figure: 1 outer shell, 2 front cover, 2-1 anti-rotation shell, 3 rear cover, 4 stator assembly, 4-1 stator body, 4-2 pole plate group, 4-3 coil slot, 5 rotor assembly, 5-1 permanent magnet, 5-2 rotor shaft, 5-3 screw rod, 5-4 first bearing, 5-5 second bearing, 6 terminal block, 6-1 lead wire, 6-2 wire protection sleeve, 7 PCB board. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to help those skilled in the art better understand the present invention, 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0027] Embodiment 1: The present invention provides a linear stepping motor, such as Figure 1-4 As shown, it includes a shell 1, a front end cover 2, and a rear end cover 3. The front end cover 2 is provided at one end of the shell 1, and the rear end cover 3 is provided at the other end.

[0028] The stator assembly 4 includes a stator body 4 - 1 and a pole plate group 4 - 2 sleeved outside the stator body 4 - 1 .

[0029] The rotor assembly 5 includes a permanent magnet 5-1, a rotor shaft 5-2, and a screw rod 5-3. The permanent magnet 5-1 is sleeved on the rotor shaft 5-2, and the screw rod 5-3 passes through the rotor shaft 5-2.

[0030] The terminal block 6 includes a lead wire 6 - 1 and a wire protection sleeve 6 - 2 that is sleeved on the lead wire 6 - 1 .

[0031] The rotor assembly 5 is arranged in the stator assembly 4, one end of the stator assembly 4 is connected to the terminal block 6, the centers of the permanent magnet 5-1, the rotor shaft 5-2, and the screw rod 5-3 are on the same axis, and the rear end cover 3 is sleeved on one end of the rotor assembly 5 close to the terminal block 6.

[0032] A PCB board 7 is installed inside the terminal block 6 . The PCB board 7 is arranged in a ring shape inside the housing 1 . The lead wire 6 - 1 passes through the terminal block 6 and is connected to the PCB board 7 .

[0033] The outer side surface of the front end cover 2 is provided with a rotation-stop shell 2-1 for limiting the front end of the screw rod 5-3, and a through hole for the screw rod 5-3 to pass through is opened in the center of the rotation-stop shell 2-1.

[0034] The screw rod 5-3 is located on one side of the front end cover 2 and is flat, with the upper and lower surfaces being parallel planes. The shape of the through hole on the anti-rotation shell 2-1 is consistent with the flat shape of the front end of the screw rod 5-3. The front end of the screw rod 5-3 passes through the through hole of the anti-rotation shell 2-1, which plays a role in preventing rotation and allows the screw rod 5-3 to slide back and forth through the through hole.

[0035] At least two pole plate groups 4 - 2 are provided on the stator assembly 4 , and coil slots 4 - 3 for winding are formed between the pole plate groups 4 - 2 .

[0036] The rotor assembly 5 also includes a first bearing 5-4 and a second bearing 5-5. The first bearing 5-4 is fixed in the front cover 2, and the second bearing 5-5 is fixed in the rear cover 3. Both ends of the rotor shaft 5-2 are supported on the first bearing 5-4 and the second bearing 5-5 respectively.

[0037] The rotor shaft 5-2 is provided with an axial through hole, the inner wall of the through hole is provided with a thread, the screw rod 5-3 passes through the rotor shaft 5-2, and the screw rod 5-3 is connected to the thread on the inner wall of the through hole of the rotor shaft 5-2.

[0038] During use, the rotor assembly 5 starts to rotate according to the frequency and number of pulses of the pulse signal, and the rotor shaft 5-2 rotates regularly under the action of the permanent magnet 5-1 and the stator assembly 4; the rotor shaft 5-2 is supported on the first bearing 5-4 and the second bearing 5-5. When the rotor shaft 5-2 rotates, the power is transmitted to the screw rod 5-3 through the thread on the inner wall of its axial through hole, and the screw rod 5-3 is extended and retracted reciprocatingly under the action of the anti-rotation shell 2-1.

[0039] The extended screw rod 5-3 is stopped and limited by the anti-rotation shell 2-1 set on the outer side of the front end cover 2 and the flat front end of the screw rod 5-3; the retracted screw rod 5-3 is limited by the rear end cover 3 set on the rotor assembly 5, effectively preventing the screw rod 5-3 from detaching from the motor and ensuring the normal use of the motor.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A linear stepping motor, characterized in that: include: A housing (1), a front end cover (2), and a rear end cover (3), wherein the housing (1) is provided with the front end cover (2) at one end and the rear end cover (3) at the other end; A stator assembly (4), comprising a stator body (4-1) and a pole plate assembly (4-2) sleeved outside the stator body (4-1); A rotor assembly (5), the rotor assembly (5) comprising a permanent magnet (5-1), a rotor shaft (5-2), and a screw rod (5-3), the permanent magnet (5-1) being sleeved on the rotor shaft (5-2), and the screw rod (5-3) passing through the rotor shaft (5-2); A terminal block (6), comprising a lead wire (6-1) and a wire protection sleeve (6-2) sleeved on the lead wire (6-1); The rotor assembly (5) is arranged in the stator assembly (4), one end of the stator assembly (4) is connected to the terminal block (6), the centers of the permanent magnet (5-1), the rotor shaft (5-2), and the screw rod (5-3) are on the same axis, and the rear end cover (3) is sleeved on one end of the rotor assembly (5) close to the terminal block (6).

2. The linear stepper motor according to claim 1, characterized in that: It also includes a PCB board (7) arranged inside the terminal block (6), the PCB board (7) is ring-shaped, and the lead wire (6-1) passes through the terminal block (6) and is connected to the PCB board (7).

3. The linear stepping motor according to claim 1, characterized in that: The outer side surface of the front end cover (2) is provided with a rotation-stopping shell (2-1) for limiting the front end of the screw rod (5-3), and a through hole for the screw rod (5-3) to pass through is provided in the center of the rotation-stopping shell (2-1).

4. The linear stepping motor according to claim 3, characterized in that: The screw rod (5-3) is located on one side of the front end cover (2) and is flat, with upper and lower surfaces being parallel planes.

5. The linear stepping motor according to claim 1, characterized in that: At least two pole plate groups (4-2) are provided on the stator assembly (4), and coil slots (4-3) for winding are formed between the pole plate groups (4-2).

6. The linear stepping motor according to claim 1, characterized in that: The rotor assembly (5) further comprises a first bearing (5-4) and a second bearing (5-5), wherein the first bearing (5-4) is fixed in the front end cover (2), and the second bearing (5-5) is fixed in the rear end cover (3), and both ends of the rotor shaft (5-2) are supported on the first bearing (5-4) and the second bearing (5-5), respectively.

7. The linear stepping motor according to claim 1, characterized in that: The rotor shaft (5-2) is provided with an axial through hole, the inner wall of which is provided with a thread, the screw rod (5-3) passes through the rotor shaft (5-2), and the screw rod (5-3) is connected to the thread on the inner wall of the through hole of the rotor shaft (5-2).

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