Long-life front closed-loop structure of permanent magnet deceleration stepping motor

Abstract

The utility model provides a long -life front closed -loop structure of permanent magnet deceleration stepping motor, designs the off -axis type encoder in the deceleration gearbox output shaft end of deceleration stepping motor body, sets up annular encoder magnet on the output shaft, sets up the encoder PCB board outside, and the sensor on the encoder PCB board can feed back the rotation angle signal, and rotation angle precision control has great promotion, and the encoder off -axis sets up in the front end of deceleration gearbox, compared with the conventional magnetic encoder structure of motor rear end pressure sleeve set magnet, motor thickness increase will be less, be favorable to the structure design when product application, the output shaft rotatable setting through the ball bearing, can bear greater axial force and radial force, and motor life improves greatly, gear support changes and uses aluminium alloy, and increased stiffener, strengthens support frame intensity, motor is 6 claw pole design, improves motor high -speed torque.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor technology, and in particular to a long-life front closed-loop structure for a permanent magnet geared stepper motor. Background Technology

[0002] The existing 35mm permanent magnet geared stepper motor is mainly used in small household appliances such as coffee machines. It typically uses open-loop control without signal feedback closed-loop control, resulting in limited control precision. Furthermore, when an encoder needs to be added to the motor, it must be placed on the rear of the motor, requiring an additional sleeve magnet structure, which significantly increases the overall length and volume of the stepper motor, hindering product application design. Additionally, the motor's gear brackets, bushings, and bearings are usually made of plastic, which, while low-cost, lacks stability and reduces the motor's lifespan. The 12-pole claw structure also has relatively low torque. Therefore, further improvements to the permanent magnet geared stepper motor structure are needed. Utility Model Content

[0003] In view of this, this utility model provides a long-life front closed-loop structure for a permanent magnet geared stepper motor. To address the problems of existing technologies, a front closed-loop encoder, ball bearings, aluminum alloy brackets, and a 6-pole motor are designed to solve the existing technical problems.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A long-life front closed-loop structure for a permanent magnet geared stepper motor, comprising:

[0006] The decelerated stepper motor body includes a motor fixed in the lower section of the housing, and a reduction gearbox located in the upper section of the housing and fixed on the upper side of the motor; the reduction gearbox is poweredly connected to the motor shaft, and the output shaft of the reduction gearbox is rotatably disposed at the center of a cover plate and extends out of the cover plate; the cover plate is fixedly disposed at the upper end of the housing to seal the housing.

[0007] The encoder lower cover is fixedly mounted on the cover plate, and has a through hole in the center for the output shaft to pass through;

[0008] The encoder PCB board is fixedly installed inside the encoder's lower cover, and has a through hole in its center for the output shaft to pass through.

[0009] The encoder magnet is fixedly mounted on the outside of the output shaft and located inside the center through hole of the encoder PCB board.

[0010] The encoder top cover is fixedly mounted on the upper side of the encoder bottom cover to cover the encoder PCB board and encoder magnet, and has a through hole in the center for the output shaft to pass through.

[0011] Furthermore, the encoder magnet is a magnetic ring, which is fixedly arranged around the outside of the output shaft.

[0012] Furthermore, a fastening hole is provided in the center of the cover plate, and a ball bearing is fixedly installed in the fastening hole. The output shaft is rotatably installed in the fastening hole through the ball bearing.

[0013] Furthermore, the gearbox includes an output shaft, a gear set, a gear bracket, and a gear plate. The output shaft is rotatably mounted at the center of the cover plate. The gear plate is fixedly mounted on the upper side of the motor. The gear bracket is fixedly mounted on the upper side of the gear plate. The gear set is rotatably mounted between the gear bracket and the cover plate. The lower end of the gear set is meshed with the rotating shaft for power connection, and the upper end of the gear set is meshed with the output shaft for power connection.

[0014] Furthermore, the gear bracket is an aluminum alloy bracket, with central reinforcing ribs on both sides of the center of the gear bracket and side reinforcing ribs on both sides of the gear bracket.

[0015] Furthermore, the motor is a 6-pole motor.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention features an off-axis encoder at the output shaft end of the gearbox of a stepper motor. A ring-shaped encoder magnet is mounted on the output shaft, with an encoder PCB board on the outside. Sensors on the encoder PCB board provide feedback of the rotation angle signal, significantly improving rotation angle accuracy. Furthermore, the off-axis encoder placement at the front of the gearbox results in a smaller increase in motor thickness compared to conventional magnetic encoders with a sleeved magnet at the rear of the motor, which is beneficial for structural design in product applications. The output shaft is rotatably mounted using ball bearings, allowing it to withstand greater axial and radial forces, thus significantly extending motor lifespan. The gear bracket is made of aluminum alloy and reinforced with ribs to enhance the support frame's strength. The motor features a 6-pole design, improving high-speed torque. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the long-life front closed-loop structure of the permanent magnet geared stepper motor in this utility model;

[0019] Figure 2 This is a schematic diagram showing the disassembly of the long-life front closed-loop structure of the permanent magnet geared stepper motor in this utility model. Figure 1 ;

[0020] Figure 3 This is a schematic diagram showing the disassembly of the long-life front closed-loop structure of the permanent magnet geared stepper motor in this utility model. Figure 2 .

[0021] The annotations in the attached figures are explained as follows:

[0022] The components include: a geared stepper motor body 10, a housing 11, a motor 12, a rotating shaft 121, a gearbox 13, an output shaft 131, a gear set 132, a gear bracket 133, a central reinforcing rib 1331, a side reinforcing rib 1332, a gear plate 134, a cover plate 14, a fastening hole 141, an encoder lower cover 20, an encoder PCB board 30, an encoder magnet 40, an encoder upper cover 50, and a ball bearing 60. Detailed Implementation

[0023] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0024] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0025] To improve control precision, reduce length and volume, and extend service life, the specific details of this utility model are as follows.

[0026] Combination Figure 1 , Figure 2 and Figure 3 As shown, the embodiment of this utility model is a long-life front closed-loop structure for a permanent magnet geared stepper motor. Importantly, it includes a geared stepper motor body 10, which includes a motor 12 fixed in the lower section of the housing 11, and a gearbox 13 located in the upper section of the housing 11 and fixed above the motor 12. The gearbox 13 is poweredly connected to the rotating shaft 121 of the motor 12. The output shaft 131 of the gearbox 13 is rotatably disposed at the center of the cover plate 14 and extends out of the cover plate 14. The cover plate 14 is fixedly disposed at the upper end of the housing 11 to seal the housing 11.

[0027] The encoder lower cover 20 is fixedly mounted on the cover plate 14, and has a through hole in its center for the output shaft 131 to pass through.

[0028] The encoder PCB board 30 is fixedly installed inside the encoder lower cover 20, and has a through hole in its center for the output shaft 131 to pass through.

[0029] The encoder magnet 40 is fixedly mounted on the outside of the output shaft 131 and located inside the central through hole of the encoder PCB board 30.

[0030] The encoder top cover 50 is fixedly mounted on the upper side of the encoder bottom cover 20 to cover the encoder PCB board 30 and encoder magnet 40, and has a through hole in the center for the output shaft 131 to pass through.

[0031] The main feature of this invention is that an off-axis encoder is designed at the output shaft 131 end of the reduction gearbox 13 of the stepper motor body 10. By setting an annular encoder magnet 40 on the output shaft 131 and setting an encoder PCB board 30 on the outside, the sensor on the encoder PCB board 30 can provide feedback of the rotation angle signal, which greatly improves the accuracy of rotation angle control. Furthermore, the encoder is off-axis and set at the front end of the reduction gearbox 13. Compared with the conventional magnetic encoder structure with a sleeve-mounted magnet at the rear end of the motor, the increase in motor thickness is less, which is beneficial to the structural design when applying the product.

[0032] Furthermore, in some embodiments, such as Figure 2 As shown, in order to better fix and display the rotation angle, the encoder magnet 40 is a magnetic ring, which is fixedly mounted around the outside of the output shaft 131 and rotates with the output shaft 131, so as to better provide rotation angle feedback.

[0033] Furthermore, in some embodiments, such as Figure 3 As shown, in order to withstand greater axial and radial forces, a fastening hole 141 is provided in the center of the cover plate 14. A ball bearing 60 is fixedly installed in the fastening hole 141. The output shaft 131 is rotatably installed in the fastening hole 141 through the ball bearing 60. The output shaft 131 can withstand greater axial and radial forces through the ball bearing 60, and the motor life is greatly improved.

[0034] Furthermore, in some embodiments, such as Figure 3 As shown, the gearbox 13 includes an output shaft 131, a gear set 132, a gear bracket 133, and a gear plate 134. The output shaft 131 is rotatably mounted at the center of the cover plate 14. The gear plate 134 is fixedly mounted on the upper side of the motor 12. The gear bracket 133 is fixedly mounted on the upper side of the gear plate 134. The gear set 132 is rotatably mounted between the gear bracket 133 and the cover plate 14. The lower end of the gear set 132 is meshed with the rotating shaft 121 for power connection, and the upper end of the gear set 132 is meshed with the output shaft 131 for power connection.

[0035] Furthermore, in some embodiments, such as Figure 3 As shown, in order to strengthen the support frame and reduce sway, the gear bracket 133 is an aluminum alloy bracket. The gear bracket 133 has central reinforcing ribs 1331 on both sides of the center and side reinforcing ribs 1332 on both sides of the side. This can effectively strengthen the support frame, reduce gear sway, ensure rotational accuracy, and improve the service life of the gearbox.

[0036] Furthermore, in some embodiments, in order to improve the high-speed torque of the motor, the motor 12 is a 6-pole motor. The 6-pole motor has a greater torque at high speed, which is beneficial for small household appliance applications.

[0037] The above description is merely illustrative of the embodiments of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model without creative labor should be included within the protection scope of this utility model.

Claims

1. A long-life front closed-loop structure for a permanent magnet geared stepper motor, characterized in that, It includes: The deceleration stepper motor body (10) includes a motor (12) fixed in the lower section of the housing (11) and a reduction gearbox (13) located in the upper section of the housing (11) and fixed on the upper side of the motor (12); the reduction gearbox (13) is poweredly connected to the rotating shaft (121) of the motor (12), and the output shaft (131) of the reduction gearbox (13) is rotatably disposed at the center of the cover plate (14) and extends out of the cover plate (14); the cover plate (14) is fixedly disposed at the upper end of the housing (11) to seal the housing (11); The encoder lower cover (20) is fixedly mounted on the cover plate (14) and has a through hole in the center for the output shaft (131) to pass through. The encoder PCB board (30) is fixedly installed inside the encoder lower cover (20), and a through hole is provided in its center for the output shaft (131) to pass through. The encoder magnet (40) is fixedly mounted on the outside of the output shaft (131) and located inside the central through hole of the encoder PCB board (30). The encoder top cover (50) is fixedly mounted on the upper side of the encoder bottom cover (20) to cover the encoder PCB board (30) and encoder magnet (40), and has a through hole in the center for the output shaft (131) to pass through.

2. The long-life front closed-loop structure of the permanent magnet geared stepper motor according to claim 1, characterized in that: The encoder magnet (40) is a magnetic ring, which is fixedly arranged around the outside of the output shaft (131).

3. The long-life front closed-loop structure of the permanent magnet geared stepper motor according to claim 1, characterized in that: The cover plate (14) has a fastening hole (141) at its center. A ball bearing (60) is fixedly installed in the fastening hole (141). The output shaft (131) is rotatably installed in the fastening hole (141) through the ball bearing (60).

4. The long-life front closed-loop structure of the permanent magnet geared stepper motor according to claim 1, characterized in that: The gearbox (13) includes an output shaft (131), a gear set (132), a gear bracket (133), and a gear plate (134). The output shaft (131) is rotatably disposed at the center of the cover plate (14). The gear plate (134) is fixedly disposed on the upper side of the motor (12). The gear bracket (133) is fixedly disposed on the upper side of the gear plate (134). The gear set (132) is rotatably disposed between the gear bracket (133) and the cover plate (14). The lower end of the gear set (132) is meshed with the rotating shaft (121) for power connection, and the upper end of the gear set (132) is meshed with the output shaft (131) for power connection.

5. The long-life front closed-loop structure of the permanent magnet geared stepper motor according to claim 4, characterized in that: The gear bracket (133) is an aluminum alloy bracket. The gear bracket (133) has a central reinforcing rib (1331) on both sides of the center and a side reinforcing rib (1332) on both sides of the side.

6. The long-life front closed-loop structure of the permanent magnet geared stepper motor according to claim 1, characterized in that: The motor (12) is a 6-pole motor.

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