A closed-loop permanent magnet deceleration stepper motor

Abstract

The utility model discloses a closed loop permanent magnet deceleration stepping motor, including motor assembly and front off axle type encoder component, the motor assembly includes the cover plate and output shaft in output end, the front off axle type encoder component includes shell, annular magnet and the PCB board of setting up with magnetic encoding chip, wherein, the bearing chamber is provided on the cover plate, the ball bearing is provided in the bearing chamber, the shell is connected on the cover plate, the PCB board is connected in the shell, the output shaft is from the ball bearing and is through the PCB board and the shell, the annular magnet is on the output shaft in the shell and is connected, the annular magnet is opposite the magnetic encoding chip and is arranged in the radial direction. The scheme of the application can reduce the volume of the whole stepping motor, and can also improve the service life of the stepping motor.

Description

Technical Field

[0001] This utility model belongs to the field of stepper motor technology, specifically relating to a closed-loop permanent magnet geared stepper motor. Background Technology

[0002] Permanent magnet geared stepper motors are widely used in many fields due to their advantages such as simple structure, reliable operation, small size, high efficiency, and flexible shape and size. In existing closed-loop stepper motors, the magnetic encoder is usually mounted at the tail end of the motor shaft. This mounting method results in a larger overall motor size, especially for miniature stepper motors, such as the 35 series, where the larger size makes installation difficult in some applications. Furthermore, in existing miniature stepper motors, the output gear support plate is usually made of plastic, and a plastic bushing is installed in the cover plate of the plastic gear support plate as a bearing for the motor output shaft. This bushing is prone to damage, reducing the motor's lifespan. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a closed-loop permanent magnet geared stepper motor that can reduce size and improve service life.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A closed-loop permanent magnet geared stepper motor includes a motor assembly and a front-mounted off-axis encoder assembly. The motor assembly includes a cover plate and an output shaft located at the output end. The front-mounted off-axis encoder assembly includes a housing, a ring magnet, and a PCB board with a magnetic encoder chip. The cover plate is provided with a bearing chamber, and a ball bearing is provided in the bearing chamber. The outer shell is connected to the cover plate, and the PCB board is connected to the outer shell. The output shaft passes through the ball bearing and passes through the PCB board and the outer shell. The annular magnet is sleeved on the output shaft in the outer shell. The annular magnet is arranged opposite to the magnetic chip in the radial direction.

[0005] In the specific design, the outer casing includes a lower casing and an upper casing that are interlocked, forming a receiving cavity between the lower casing and the upper casing. The PCB board and the annular magnet are both located within the receiving cavity. The lower casing is provided with a through hole that matches the bearing chamber, and the bearing chamber extends into the receiving cavity through the through hole. The PCB board is provided with a first clearance hole for the output shaft to pass through, and the upper casing is provided with a second clearance hole for the output shaft to pass through.

[0006] In the specific design, a support column is provided at the bottom of the lower housing, and the PCB board is connected to the support column.

[0007] In the specific embodiment, the motor assembly includes a cylinder, a motor body, a gearbox, a cover plate, and an output shaft; the motor body is mounted on the bottom of the cylinder, the gearbox is located inside the cylinder and is connected to the output end of the motor body, the output shaft is connected to the output end of the gearbox, and the cover plate covers the cylinder.

[0008] In the specific solution, the motor body includes a ring-shaped support frame, a ring-shaped pole plate, and a rotor mechanism. The pole plate is disposed within the support frame, and the rotor mechanism is disposed within the pole plate. The supporting frame includes a lower frame and an upper frame connected in sequence, and the electrode plate includes a lower electrode plate, a middle electrode plate and an upper electrode plate connected in sequence from bottom to top.

[0009] In the specific design, the lower electrode plate, the middle electrode plate, and the upper electrode plate are each provided with 6 electrode claws.

[0010] In the specific embodiment, the gearbox includes a gear support plate, a gear bracket, and multiple gears. The gear support plate is connected to the motor body, the gear bracket is connected to the gear support plate, and the multiple gears are rotatably connected to the gear support plate and supported and / or limited by the gear bracket. The gear bracket is made of aluminum alloy and has multiple reinforcing ribs.

[0011] In the specific design, a cable guard box is connected to the outer wall of the cylinder, and a control circuit board electrically connected to the motor body is provided in the cable guard box.

[0012] The closed-loop permanent magnet geared stepper motor provided in this embodiment of the invention has a magnetic encoder for closed-loop control located at one end of the motor's output shaft, with the encoder chip positioned on the side of the magnet, forming a front-mounted off-axis encoder assembly. Compared to traditional rear-mounted magnetic encoders, this reduces the overall size of the stepper motor and makes the encoder assembly easier to assemble, making it particularly suitable for miniature stepper motors (such as 35-series stepper motors). Furthermore, a ball bearing is installed in the bearing chamber of the cover plate at the output end of the motor assembly, supporting the output shaft and allowing it to withstand greater axial and radial forces, significantly improving the stepper motor's service life. Attached Figure Description

[0013] Figure 1 This is an external structural diagram of the closed-loop permanent magnet speed-reduced stepper motor in this embodiment of the utility model; Figure 2 This is a cross-sectional view of the closed-loop permanent magnet speed-reduced stepper motor in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the motor body in an embodiment of this utility model; Figure 4 This is a schematic diagram of the motor body after the support frame has been removed in an embodiment of this utility model; Figure 5 It corresponds to, for example Figure 4 An exploded structural diagram of the structural components shown; Figure 6 This is a schematic diagram of the gearbox structure in an embodiment of the present utility model; Figure 7 This is a schematic diagram of the gear support plate in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the gear bracket in an embodiment of the present utility model; Figure 9 This is an exploded view of the front-mounted off-axis encoder assembly in an embodiment of this utility model. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of this utility model shown in and described with reference to the drawings are merely exemplary, and this utility model is not limited to these embodiments.

[0015] It should be noted that the same or similar reference numerals in the accompanying drawings of the embodiments of this utility model correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0016] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related to the present invention are omitted.

[0017] This utility model provides a closed-loop permanent magnet geared stepper motor, see reference. Figures 1 to 9The closed-loop permanent magnet geared stepper motor mainly includes a motor assembly 1 and a front-mounted off-axis encoder assembly 2. In a preferred embodiment, the closed-loop permanent magnet geared stepper motor is a 35 series stepper motor.

[0018] The motor assembly 1 mainly includes a cylinder 13, a motor body 14, a gearbox 15, a cover plate 11, and an output shaft 12. Specifically, the motor body 14 is mounted on the bottom of the cylinder 13, the gearbox 15 is located inside the cylinder 13 and is connected to the output end of the motor body 14, the cover plate 11 covers the cylinder 13, and the output shaft 12 passes through the cover plate 11 and is connected to the output end of the gearbox 15. The power output by the motor body 14 is transmitted to the output shaft 12 through the gearbox 15.

[0019] In this embodiment, a bearing chamber 16 is provided on the cover plate 11, and a ball bearing 3 is provided in the bearing chamber 16. The output shaft 12 passes through the ball bearing 3 and is supported by the ball bearing 3. By providing the ball bearing 3 in the bearing chamber 16 at the output end to support the output shaft 12, the output shaft 12 can withstand greater axial and radial forces, thus significantly improving the service life of the stepper motor.

[0020] In this embodiment, the front-mounted off-axis encoder assembly 2 includes a housing 21, a ring magnet 22, and a PCB board 23 with a magnetic encoder chip 24. Specifically, the housing 21 is connected to the cover plate 11, the PCB board 23 is connected inside the housing 21, the output shaft 12 passes through the ball bearing 3 and through the PCB board 23 and the housing 21, and the ring magnet 22 is sleeved on the output shaft 12 inside the housing 21. The ring magnet 22 is radially opposite to the magnetic encoder chip 24. Thus, the ring magnet 22 can rotate with the output shaft 12, and the magnetic encoder chip 24 senses the change in the magnetic field of the ring magnet 22 to provide feedback on the rotation angle signal of the output shaft 12, forming a closed-loop control system that allows for precise control of the rotation angle.

[0021] As described above, the stepper motor has a magnetic encoder for closed-loop control located at one end of the motor's output shaft, and the magnetic encoder chip 23 is located on the side of the annular magnet 22, forming a front-mounted off-axis encoder assembly 2. Compared with the traditional rear-mounted magnetic encoder, this reduces the overall size of the stepper motor and makes the encoder assembly easier to assemble, making it particularly suitable for micro-sized stepper motors (such as 35 series stepper motors).

[0022] In the specific design, the outer casing 21 includes a lower casing 211 and an upper casing 212 that interlock with each other, forming a receiving cavity 213 between the lower casing 211 and the upper casing 212. The PCB board 23 and the annular magnet 22 are both located within the receiving cavity 213. The lower casing 211 has a through hole 214 adapted to the bearing chamber 16, through which the bearing chamber 16 extends into the receiving cavity 213. The PCB board 23 has a first clearance hole 215 for the output shaft 12 to pass through, and the upper casing 212 has a second clearance hole 216 for the output shaft 12 to pass through.

[0023] Furthermore, a support column 217 is provided at the bottom of the lower housing 211, and the PCB board 23 is connected to the support column 217.

[0024] In a specific embodiment, the motor body 14 includes a ring-shaped support frame 141, a ring-shaped pole plate 142, and a rotor mechanism 143. The pole plate 142 is disposed within the support frame 141, and the rotor mechanism 143 is disposed within the pole plate 142. The support frame 141 includes a lower frame 1411 and an upper frame 1412 connected in sequence, and the pole plate 142 includes a lower pole plate 1421, a middle pole plate 1422, and an upper pole plate 1423 connected in sequence from bottom to top.

[0025] In this embodiment, the lower electrode plate 1421, the middle electrode plate 1422, and the upper electrode plate 1423 are each provided with six pole claws. The use of a six-pole claw electrode plate structure in this stepper motor can improve the torque of the stepper motor during high-speed operation.

[0026] In the specific design, the gearbox 15 includes a gear support plate 151, a gear bracket 152, and multiple gears 153. The gear support plate 151 is connected to the motor body 14, the gear bracket 152 is connected to the gear support plate 151, and the multiple gears 153 are rotatably connected to the gear support plate 151 and supported and / or limited by the gear bracket 152. The gear bracket 152 is made of aluminum alloy and has multiple reinforcing ribs 154, thereby improving the structural strength of the gear bracket 152 and extending the service life of the stepper motor.

[0027] Furthermore, a cable guard box 17 is connected to the outer wall of the cylinder 13, and a control circuit board 18 electrically connected to the motor body 14 is provided in the cable guard box 17.

[0028] In summary, the closed-loop permanent magnet geared stepper motor provided in this embodiment uses a front-mounted off-axis encoder assembly for closed-loop control. This not only reduces the overall size of the stepper motor but also makes the encoder assembly easier to assemble, making it particularly suitable for miniature stepper motors (such as the 35 series stepper motors). Furthermore, the use of ball bearings to support the output shaft allows it to withstand greater axial and radial forces, significantly improving the stepper motor's service life.

[0029] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A closed loop permanent magnet geared stepper motor characterized by, It includes a motor assembly (1) and a front off-axis encoder assembly (2). The motor assembly (1) includes a cover plate (11) located at the output end and an output shaft (12). The front off-axis encoder assembly (2) includes a housing (21), an annular magnet (22) and a PCB board (23) with a magnetic encoder chip (24). The cover plate (11) is provided with a bearing chamber (16), and a ball bearing (3) is provided in the bearing chamber (16). The outer shell (21) is connected to the cover plate (11), and the PCB board (23) is connected inside the outer shell (21). The output shaft (12) passes through the ball bearing (3) and passes through the PCB board (23) and the outer shell (21). The annular magnet (22) is sleeved on the output shaft (12) inside the outer shell (21). The annular magnet (22) is arranged opposite to the magnetic braided chip (24) in the radial direction.

2. The closed loop permanent magnet geared stepper motor of claim 1, wherein, The outer casing (21) includes a lower casing (211) and an upper casing (212) that are interlocked with each other. A receiving cavity (213) is formed between the lower casing (211) and the upper casing (212). The PCB board (23) and the annular magnet (22) are both located in the receiving cavity (213). The lower casing (211) is provided with a through hole (214) that is adapted to the bearing chamber (16). The bearing chamber (16) extends into the receiving cavity (213) through the through hole (214). The PCB board (23) is provided with a first clearance hole (215) for the output shaft (12) to pass through. The upper casing (212) is provided with a second clearance hole (216) for the output shaft (12) to pass through.

3. The closed loop permanent magnet geared stepper motor of claim 2, wherein, The bottom of the lower housing (211) is provided with a support column (217), and the PCB board (23) is connected to the support column (217).

4. A closed loop permanent magnet geared stepper motor according to any one of claims 1-3, characterized in that, The motor assembly (1) includes a cylinder (13), a motor body (14), a gearbox (15), a cover plate (11), and an output shaft (12); the motor body (14) is mounted on the bottom of the cylinder (13), the gearbox (15) is located inside the cylinder (13) and is connected to the output end of the motor body (14), the output shaft (12) is connected to the output end of the gearbox (15), and the cover plate (11) covers the cylinder (13).

5. The closed loop permanent magnet geared stepper motor of claim 4, wherein, The motor body (14) includes a ring-shaped support frame (141), a ring-shaped pole plate (142), and a rotor mechanism (143). The pole plate (142) is disposed within the support frame (141), and the rotor mechanism (143) is disposed within the pole plate (142). The supporting frame (141) includes a lower frame (1411) and an upper frame (1412) connected in sequence, and the electrode plate (142) includes a lower electrode plate (1421), a middle electrode plate (1422) and an upper electrode plate (1423) connected in sequence from bottom to top.

6. The closed loop permanent magnet geared stepper motor of claim 5, wherein, The lower electrode plate (1421), the middle electrode plate (1422), and the upper electrode plate (1423) are each provided with 6 electrode claws.

7. The closed loop permanent magnet geared stepper motor of claim 4, wherein, The gearbox (15) includes a gear support plate (151), a gear bracket (152), and a plurality of gears (153). The gear support plate (151) is connected to the motor body (14), the gear bracket (152) is connected to the gear support plate (151), and the plurality of gears (153) are rotatably connected to the gear support plate (151) and supported and / or limited by the gear bracket (152). The gear bracket (152) is a bracket made of aluminum alloy and has multiple reinforcing ribs (154) therein.

8. The closed loop permanent magnet geared stepper motor of claim 4, wherein, A cable guard box (17) is connected to the outer wall of the cylinder (13), and a control circuit board (18) electrically connected to the motor body (14) is provided in the cable guard box (17).

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