Stepping motor with large braking torque

Abstract

The utility model discloses a stepping motor with a large braking torque. The stepping motor comprises a motor main body and a rotating shaft which is in driving connection with the motor main body. The motor further comprises a brake part, the brake part is fixedly installed on the motor body, and the brake part abuts against the peripheral face of the rotating shaft. According to the stepping motor with the large braking torque, the braking component is arranged on the motor body, the braking torque of the motor body is increased through the tangential force generated when the braking component abuts against the peripheral face of the rotating shaft, and therefore the requirements of some customers for motors with the large braking torque are met.

Description

Technical Field

[0001] This utility model relates to the field of stepper motor technology, and in particular to a stepper motor with large braking torque. Background Technology

[0002] A hybrid stepper motor is a mechanical device that directly converts electrical pulses into angular displacement. It is a type of stepper motor developed by combining the characteristics of permanent magnet stepper motors and reactive stepper motors. The motor speed depends only on the number of electrical pulses. It and its matching stepper motor driver form a low-cost open-loop system. With the addition of an encoder and peripheral drive system, it can also become a stepper servo system. The stepper motor driver, based on external control pulses and direction signals, controls the stepper motor to operate in a specific timing sequence of forward or reverse energization through its internal logic circuitry, causing the motor to rotate forward or in reverse.

[0003] Hybrid stepper motors combine the advantages of reactive and permanent magnet motors. Their stator has multi-phase windings, and the rotor uses permanent magnet materials. Both the rotor and stator have multiple small teeth to improve step accuracy. They are characterized by high output torque, good dynamic performance, and a small step angle. Advantages include precise position control, accurate speed, forward / reverse rotation, emergency stop and locking functions, low-speed and high-precision positioning, and long lifespan. However, they have a complex structure and relatively high cost.

[0004] In the existing hybrid stepper motor structure, the motor output shaft is kept concentric by the tight fit of the front and rear end covers, which ensures the stability of the air gap. Although this structure ensures excellent motor performance, the output shaft braking torque is small when not powered on, and the output shaft rotates smoothly, which does not meet the requirements of some customers for the equipment. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a stepper motor with large braking torque.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a stepper motor with large braking torque, including a motor body and a rotating shaft drivenly connected to the motor body; it also includes a braking component, which is fixedly installed on the motor body and abuts against the outer peripheral surface of the rotating shaft.

[0007] Furthermore, the braking component is interference-fitted with the motor body.

[0008] Furthermore, the braking element is annular, and the rotating shaft passes through the braking element.

[0009] Furthermore, the braking component includes an inner ring, a connecting part, and an outer ring that are sequentially connected from the inside out. The axial length of the connecting part is less than the axial length of the inner ring and the outer ring. The rotating shaft passes through the inner ring, and the outer ring is interference-fitted with the motor body.

[0010] Furthermore, the braking component is adhesively bonded to the motor body.

[0011] Furthermore, the braking component is made of silicone or rubber.

[0012] Furthermore, the motor body includes a frame, a stator core, a rotor core, a front end cover, and a rear end cover. The frame is fixedly installed on the stator core, and the front end cover and the rear end cover are respectively fixedly installed at both ends of the stator core. The rotating shaft passes through the frame, and the rotor core is sleeved on the outer circumference of the rotating shaft. The rotating shaft is rotatably connected to the front end cover and the rear end cover respectively.

[0013] Furthermore, the rotating shaft is rotatably connected to the front end cover and / or the rear end cover via bearings.

[0014] Furthermore, both the front end cover and the rear end cover are fixedly connected to the stator core by screws.

[0015] Furthermore, the stator core is provided with a first through hole for the screw to pass through, the rear end cover is provided with a second through hole for the screw to pass through, and the front end cover is provided with a threaded hole that mates with the screw.

[0016] The beneficial effects of this utility model are as follows: This stepper motor with large braking torque increases the braking torque of the motor body by setting a braking component on the motor body and using the tangential force generated by the braking component against the outer circumferential surface of the rotating shaft, thereby meeting the requirements of some customers for motors with large braking torque. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the stepper motor with large braking torque according to Embodiment 1 of this utility model.

[0018] Figure 2 An exploded view of a stepper motor with high braking torque according to Embodiment 1 of this utility model;

[0019] Figure 3 This is a schematic diagram of the braking component in a stepper motor with high braking torque according to Embodiment 1 of this utility model.

[0020] Label Explanation:

[0021] 1. Motor body; 11. Frame; 12. Stator core; 121. First through hole; 13. Rotor core; 14. Front end cover; 141. Threaded hole; 142. Annular boss; 15. Rear end cover; 151. Second through hole; 16. Bearing; 17. Screw;

[0022] 2. Shaft;

[0023] 3. Braking component; 31. Inner ring; 32. Connecting part; 33. Outer ring. Detailed Implementation

[0024] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0025] Please refer to Figures 1 to 3 A stepper motor with high braking torque includes a motor body 1 and a rotating shaft 2 drivenly connected to the motor body 1; it also includes a brake 3, which is fixedly installed on the motor body 1 and abuts against the outer peripheral surface of the rotating shaft 2.

[0026] As can be seen from the above description, the beneficial effects of this utility model are as follows: This stepper motor with large braking torque increases the braking torque of the motor body 1 by setting a braking element 3 on the motor body 1 and using the tangential force generated by the braking element 3 against the outer peripheral surface of the rotating shaft 2, so as to meet the requirements of some customers for motors with large braking torque.

[0027] Furthermore, the braking component 3 is interference-fitted with the motor body 1.

[0028] As can be seen from the above description, no additional connecting parts are needed when connecting the brake component 3 to the motor body 1, which helps to reduce production costs.

[0029] Furthermore, the brake element 3 is annular, and the rotating shaft 2 passes through the brake element 3.

[0030] As can be seen from the above description, the annular brake 3 can provide uniform tangential force to all parts of the outer circumference of the rotating shaft 2, preventing the rotating shaft 2 from being deflected by force.

[0031] Furthermore, the braking component 3 includes an inner ring 31, a connecting part 32, and an outer ring 33 connected sequentially from the inside to the outside. The axial length of the connecting part 32 is less than the axial length of the inner ring 31 and the outer ring 33. The rotating shaft 2 passes through the inner ring 31, and the outer ring 33 is interference-fitted with the motor body 1.

[0032] As can be seen from the above description, increasing the axial length of the inner ring 31 can enable the brake element 3 to provide sufficient tangential force to the rotating shaft 2, thereby increasing the braking force of the motor body 1. Increasing the axial length of the outer ring 33 can facilitate the assembly of the braking force with the motor body 1, and reduce the pressure transmitted to the rotating shaft 2 when the outer ring 33 is in an interference fit with the motor body 1, thus reducing the impact on motor performance.

[0033] Furthermore, the braking component 3 is glued to the motor body 1.

[0034] As can be seen from the above description, the brake component 3 is not easy to detach from the motor body 1 after being connected.

[0035] Furthermore, the braking component 3 is made of silicone or rubber.

[0036] As can be seen from the above description, the material of brake component 3 can be selected according to actual usage needs or production conditions.

[0037] Furthermore, the motor body 1 includes a frame 11, a stator core 12, a rotor core 13, a front end cover 14, and a rear end cover 15. The frame 11 is fixedly installed on the stator core 12. The front end cover 14 and the rear end cover 15 are respectively fixedly installed at both ends of the stator core 12. The rotating shaft 2 passes through the frame 11. The rotor core 13 is sleeved on the outer periphery of the rotating shaft 2. The rotating shaft 2 is rotatably connected to the front end cover 14 and the rear end cover 15 respectively.

[0038] Furthermore, the rotating shaft 2 is rotatably connected to the front end cover 14 and / or the rear end cover 15 via a bearing 16.

[0039] As can be seen from the above description, bearing 16 can reduce the friction force on shaft 2 and reduce the power loss of this stepper motor.

[0040] Furthermore, both the front end cover 14 and the rear end cover 15 are fixedly connected to the stator core 12 by screws 17.

[0041] As can be seen from the above description, the connection between the front cover 14, the rear cover 15 and the stator core 12 is stable and easy to disassemble and assemble.

[0042] Furthermore, the stator core 12 is provided with a first through hole 121 for the screw 17 to pass through, the rear end cover 15 is provided with a second through hole 151 for the screw 17 to pass through, and the front end cover 14 is provided with a threaded hole 141 that mates with the screw 17.

[0043] As can be seen from the above description, the screw 17 can simultaneously fix the front end cover 14 and the rear end cover 15 to the stator core 12, which helps to reduce the number of screws 17, reduce production costs, and improve assembly efficiency.

[0044] Please refer to Figures 1 to 3 The first embodiment of this utility model is: a stepper motor with large braking torque, including a motor body 1 and a rotating shaft 2 drivenly connected to the motor body 1; it also includes a brake 3, which is fixedly installed on the motor body 1 and abuts against the outer peripheral surface of the rotating shaft 2.

[0045] In order to avoid increasing production costs and reducing assembly efficiency by adding more parts, in this embodiment, the brake component 3 is interference-fitted with the motor body 1.

[0046] like Figure 1 As shown, in this embodiment, the braking element 3 is annular, and the rotating shaft 2 passes through the braking element 3. Specifically, as... Figure 3 As shown, the braking component 3 includes an inner ring 31, a connecting part 32, and an outer ring 33 connected sequentially from the inside out. The axial length of the connecting part 32 is less than the axial length of the inner ring 31 and the outer ring 33. The rotating shaft 2 passes through the inner ring 31, and the outer ring 33 is interference-fitted with the motor body 1. Optionally, the braking component 3 is made of silicone or rubber. Because the axial length of the connecting part 32 is less than the axial length of the inner ring 31 and the outer ring 33, when the outer ring 33 is interference-fitted with the motor body 1, the pressure transmitted to the rotating shaft 2 through the outer ring 33 can be effectively reduced, ensuring that most of the tangential force on the rotating shaft 2 comes from the inner ring 31. Furthermore, this structural design increases the rigidity of the outer ring that fits with the motor body 1 and reduces the rigidity of the inner ring that fits with the rotating shaft 2, making the outer ring relatively rigid and the inner ring relatively flexible, which better meets the requirement of increasing the motor's torque without affecting the motor's performance.

[0047] In order to prevent the brake element 3 from detaching from the motor body 1, in this embodiment, the brake element 3 is glued to the motor body 1.

[0048] like Figure 1 and Figure 2 As shown, the motor body 1 includes a frame 11, a stator core 12, a rotor core 13, a front end cover 14, and a rear end cover 15. The frame 11 is fixedly installed on the stator core 12. The front end cover 14 and the rear end cover 15 are respectively fixedly installed at both ends of the stator core 12. The rotating shaft 2 passes through the frame 11, and the rotor core 13 is sleeved on the outer circumference of the rotating shaft 2. The rotating shaft 2 is rotatably connected to the front end cover 14 and the rear end cover 15 respectively. The front end cover 14 has a shaft hole for one end of the rotating shaft 2 to be exposed. The end face of the front end cover 14 away from the stator core 12 has a protruding annular boss 142. The annular boss 142 is coaxially arranged with the shaft hole. The outer ring 33 of the brake element 3 is sleeved on the annular boss 142, and the inner ring 31 of the brake element 3 is placed between the annular boss 142 and the rotating shaft 2.

[0049] The rotating shaft 2 is rotatably connected to the front cover 14 and the rear cover 15 via bearing 16. Specifically, as shown... Figure 2As shown, a bearing 16 is provided on the inner side of the front cover 14 and the rear cover 15 respectively. Positioning the bearing 16 within the space enclosed by the front cover 14, the rear cover 15, and the stator core 12 effectively prevents the bearing 16 from contacting the outside environment, thus protecting the bearing 16 and increasing the service life of the stepper motor. In this embodiment, the brake component 3 also seals the assembly gap between the rotating shaft 2 and the motor body 1, further improving the sealing performance of the stepper motor.

[0050] Both the front cover 14 and the rear cover 15 are fixedly connected to the stator core 12 by screws 17. Specifically, as shown... Figure 2 As shown, the stator core 12 has a first through hole 121 for screws 17 to pass through, the rear end cover 15 has a second through hole 151 for screws 17, and the front end cover 14 has a threaded hole 141 for engaging with screws 17. The number of screws 17, first through holes 121, second through holes 151, and threaded holes 141 are arranged in a one-to-one correspondence, with four screws 17, four first through holes 121, four second through holes 151, and four threaded holes 141 in each case. In other embodiments, the number of screws 17, first through holes 121, two through holes 151, and threaded holes 141 may be two, three, or more.

[0051] In summary, the stepper motor with high braking torque provided by this utility model increases the braking torque of the motor body by setting a braking component on the motor body and using the tangential force generated by the braking component against the outer circumferential surface of the rotating shaft, thereby meeting the requirements of some customers for motors with high braking torque.

[0052] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A stepper motor with high braking torque, comprising a motor body and a rotating shaft drivenly connected to the motor body; characterized in that: It also includes a braking component, which is fixedly installed on the motor body and abuts against the outer peripheral surface of the rotating shaft.

2. The stepper motor with large braking torque according to claim 1, characterized in that: The braking component is interference-fitted with the motor body.

3. A stepper motor with large braking torque according to claim 1, characterized in that: The braking element is ring-shaped, and the rotating shaft passes through the braking element.

4. A stepper motor with large braking torque according to claim 3, characterized in that: The braking component includes an inner ring, a connecting part, and an outer ring that are sequentially linked from the inside out. The axial length of the connecting part is less than the axial length of the inner ring and the outer ring. The rotating shaft passes through the inner ring, and the outer ring is interference-fitted with the motor body.

5. A stepper motor with high braking torque according to claim 1, characterized in that: The braking component is glued to the motor body.

6. A stepper motor with large braking torque according to claim 1, characterized in that: The braking component is made of silicone or rubber.

7. A stepper motor with large braking torque according to claim 1, characterized in that: The motor body includes a frame, a stator core, a rotor core, a front cover, and a rear cover. The frame is fixedly installed on the stator core. The front cover and the rear cover are fixedly installed at both ends of the stator core, respectively. The rotating shaft passes through the frame, and the rotor core is sleeved on the outer circumference of the rotating shaft. The rotating shaft is rotatably connected to the front cover and the rear cover, respectively.

8. A stepper motor with large braking torque according to claim 7, characterized in that: The rotating shaft is rotatably connected to the front end cover and / or the rear end cover via bearings.

9. A stepper motor with large braking torque according to claim 7, characterized in that: Both the front end cover and the rear end cover are fixedly connected to the stator core by screws.

10. A stepper motor with large braking torque according to claim 9, characterized in that: The stator core has a first through hole for the screw to pass through, the rear end cover has a second through hole for the screw to pass through, and the front end cover has a threaded hole that mates with the screw.

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