Battery-driven motor and motor drive system

Abstract

The present invention discloses a battery-driven motor and a motor drive system, which relate to the technical field of drive motors and include a motor body, a rotating shaft for cooperating with a pulley provided on the motor body, an air cavity provided inside the rotating shaft, a first chute provided on the outer wall of the rotating shaft, an air hole provided on the inner wall of the first chute, the first chute communicating with the air cavity through the air hole, a slider for radially positioning the pulley slidably provided inside the first chute, a first threaded rod rotatably provided on the rotating shaft, and slip rings slidably provided on both sides of the air cavity. The battery-driven motor and motor drive system, by providing structures such as a slider, a first pressure plate, and a second pressure plate, are suitable for pulleys of different inner diameters, simultaneously positioning the pulley radially and axially, and achieving a synchronous self-locking effect of radial and axial positioning, thereby improving the applicability of the battery-driven motor.

Description

Technical Field

[0001] The present invention relates to the technical field of drive motors, and in particular to a battery-driven motor and a motor drive system. Background Art

[0002] ‌Motor and electric machine are conceptually the same, both referring to devices that convert electrical energy into mechanical energy, but in practical applications, motor is a more formal term, while electric machine is a more common name.

[0003] In the prior art, battery-driven motors are usually only applicable to pulleys, gears, etc. with a single inner diameter, and their efficiency needs to be improved.

[0004] Therefore, it is necessary to propose a battery-driven motor and a motor-driven system to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a battery-driven motor and a motor drive system to solve the problem in the prior art that battery-driven motors are generally only suitable for pulleys, gears, etc. with a single inner diameter size, and their efficiency needs to be improved.

[0006] To achieve the above object, the present invention provides the following technical solution: a battery-driven motor, comprising a motor body, wherein the motor body is provided with a rotating shaft cooperating with a pulley;

[0007] An air cavity is provided inside the rotating shaft, a first slide groove is provided on the outer wall of the rotating shaft, an air hole is provided on the inner wall of the first slide groove, the first slide groove is connected to the air cavity through the air hole, a slider for radially positioning the pulley is slidably provided inside the first slide groove, a first threaded rod is rotatably provided on the rotating shaft, slip rings are slidably provided on both sides of the air cavity, the first threaded rod rotates, driving the two slip rings to move toward each other, the gas inside the air cavity enters the interior of the first slide groove through the air hole, pushing the slider to slide outward and abut against the inner ring of the pulley;

[0008] A first pressing plate is provided on the side of the pulley facing away from the motor body, and a second pressing plate is provided on the side of the pulley close to the motor body. The first pressing plate and the second pressing plate move toward each other to position the pulley axially.

[0009] When the first pressing plate abuts against the outer wall of the pulley, the first threaded rod is limited by the limiting assembly to prevent the first threaded rod from rotating in the reverse direction.

[0010] Preferably, the first sliding grooves are provided in plurality, and the plurality of first sliding grooves are evenly distributed around the rotating shaft.

[0011] Preferably, one of the sliders is fixedly connected with a key tooth that cooperates with the keyway of the pulley.

[0012] Preferably, circular grooves are provided at both ends of the air cavity, and a second sliding groove is provided on the outer wall of the rotating shaft. The second sliding grooves are provided in two, and the two second sliding grooves are respectively distributed on both sides of the air cavity. The second sliding groove is connected to the air cavity through the corresponding circular groove. A threaded cylinder is slidably connected to the inside of the circular groove, and the threaded cylinder is fixedly connected to the corresponding slip ring. The threaded cylinder cooperates with the first threaded rod, wherein a first square plate is slidably provided in a second sliding groove away from the motor body, and the first square plate is fixedly connected to the corresponding threaded cylinder. A square groove is provided on the first square plate, and a third plate is slidably provided in the other second sliding groove, and the third plate is fixedly connected to the corresponding threaded cylinder.

[0013] Preferably, the threads at both ends of the first threaded rod have opposite directions.

[0014] Preferably, the limit assembly includes a second square plate, a second threaded rod, an outer groove, a U-shaped clip, a slide plate, a slide cylinder, a spring, a vertical plate, an inner groove and a limit block, the second square plate is inserted into the interior of the square groove, the second threaded rod is threadedly connected to the second square plate, the first pressure plate is fixedly connected to the second threaded rod, the outer groove is opened at one end of the second threaded rod away from the first pressure plate, the U-shaped clip is plugged into and cooperates with the outer groove, one end of the slide plate is fixedly connected to the U-shaped clip, the other end of the slide plate is slidably connected to the interior of the slide cylinder, the spring is located inside the slide cylinder, one end of the spring is fixedly connected to the slide plate, the other end of the spring is fixedly connected to the inner wall of the slide cylinder, the vertical plate is fixedly connected to the outer wall of the slide cylinder, the vertical plate and the slide cylinder are distributed in an L shape, the inner groove is opened on the first threaded rod, the limit block is inserted into the interior of the inner groove, and the limit block is fixedly connected to the vertical plate.

[0015] Preferably, a third threaded rod is threadedly connected to the third plate, and the second pressing plate is fixedly connected to the third threaded rod.

[0016] Preferably, a first through hole is provided on the first pressure plate, and the first through hole is provided in plurality and the plurality of first through holes are evenly distributed; a second through hole is provided on the second pressure plate, and the second through hole is provided in plurality and the plurality of second through holes are evenly distributed; a first round rod is provided on the outside of the rotating shaft, and one end of the first round rod is inserted into one of the first through holes, and the other end of the first round rod is inserted into the corresponding second through hole; a through groove is provided on the second square plate for the first round rod to pass through.

[0017] Preferably, one end of the first round rod close to the second square plate is fixedly connected to a rotating rod, the rotating rod is rotatably connected to the second round rod, and a torsion spring is sleeved on the outside of the rotating rod.

[0018] The present invention also discloses a motor drive system, which is applied to the above-mentioned battery-driven motor and further includes: a battery, a control circuit and a power circuit.

[0019] The technical effects and advantages of the present invention are as follows:

[0020] The present invention is applicable to pulleys of different inner diameters by providing structures such as a slider, a first pressing plate, and a second pressing plate. The pulley is positioned radially and axially at the same time, and the radial and axial positioning are synchronously self-locked, thereby improving the applicability of the battery-driven motor.

[0021] The radial and axial positioning of the pulley are concentrated on the inner ring of the pulley, that is, the connection between the shaft and the pulley, which improves the stability of the connection without affecting the coordination between the pulley and the belt;

[0022] The first pressing plate and the limiting assembly are configured as movable structures, which do not affect the installation of the pulley onto the outside of the rotating shaft;

[0023] The slip ring, slider and other structures are provided, and the first threaded rod is rotated. Compared with the prior art method of installing the pulley by hammering, this method will not affect the drive motor.

[0024] By setting the first round rod, the second round rod and other structures, the positioning of the second pressure plate is completed, and the stability of the pulley positioning is improved. At the same time, when the motor body is running, the first round rod and the second round rod will not be thrown out directly when the shaft drives the pulley to rotate at high speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of the battery-driven motor from one perspective of the present invention.

[0026] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure in the middle.

[0027] Figure 3 This is a schematic structural diagram of the battery-driven motor of the present invention from another perspective.

[0028] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point B in the middle.

[0029] Figure 5 It is a schematic diagram of the slider and key tooth structure of the present invention.

[0030] Figure 6 It is a schematic diagram of the circular groove and air cavity structure of the present invention.

[0031] Figure 7 For the present invention Figure 6 Enlarged schematic diagram of the structure at point C in the middle.

[0032] Figure 8 For the present invention Figure 7 Enlarged schematic diagram of the structure at point D in the middle.

[0033] Figure 9 For the present invention Figure 6 Enlarged schematic diagram of the structure at E in the middle.

[0034] Figure 10 It is a schematic diagram of the structure of the rotating shaft and the first sliding groove of the present invention.

[0035] In the figure: 1. motor body; 2. rotating shaft; 3. pulley; 4. first slide groove; 5. slider; 6. key tooth; 7. circular groove; 8. air cavity; 9. slip ring; 10. second slide groove; 11. first square plate; 12. threaded cylinder; 13. air hole; 14. first threaded rod; 15. square groove; 16. second square plate; 17. second threaded rod; 18. first pressure plate; 19. third party plate; 20. third threaded rod; 21. second pressure plate; 22. first through hole; 23. second through hole; 24. first round rod; 25. rotating rod; 26. second round rod; 27. through groove; 28. torsion spring; 29. ​​outer groove; 30. U-shaped card; 31. slide plate; 32. slide cylinder; 33. spring; 34. vertical plate; 35. inner groove; 36. limit block. DETAILED DESCRIPTION

[0036] The present invention provides Figures 1 to 10 A battery-driven motor shown includes a motor body 1, on which is provided a rotating shaft 2 that cooperates with a pulley 3, gears, etc. In addition, the motor body 1 is also provided with a stator, a rotor and other structures. The motor body 1 can be powered by a battery, which is convenient for flexible adjustment of the use position, such as long-distance transfer, without considering factors such as wire connection.

[0037] Considering the battery-driven motors in the prior art, the rotating shaft 2 is usually only suitable for docking with a pulley 3 of a single inner diameter size. In particular, for a drive motor powered by a battery, if it cannot form an effective docking with the pulley 3 after long-distance transfer, the processing efficiency will be affected. To improve the applicability of the battery-driven motor, an air cavity 8 is provided inside the rotating shaft 2, and a first chute 4 is provided on the outer wall of the rotating shaft 2. The first chute 4 is provided with multiple first chute 4s, and the multiple first chute 4s are evenly distributed around the rotating shaft 2, preferably three, to ensure the strength of the rotating shaft 2. An air hole 13 is provided on the inner wall of the first chute 4, and the air hole 13 is located in the middle of the air cavity 8. The first chute 4 is connected to the air cavity 8 through the air hole 13. A slider 5 is provided inside the first chute 4 for radially positioning the pulley 3. When the gas enters the interior of the first chute 4 through the air hole 13, it pushes the slider 5 to slide outward and squeeze on the inner ring of the pulley 3.

[0038] A key tooth 6 that cooperates with the key groove of the pulley 3 is fixedly connected to one of the sliders 5 , and the key tooth 6 cooperates with the key groove of the pulley 3 .

[0039] A first threaded rod 14 is rotatably provided on the rotating shaft 2 , and the thread directions of the two ends of the first threaded rod 14 are opposite. Slip rings 9 are slidably provided on both sides of the air cavity 8 .

[0040] Circular grooves 7 are provided at both ends of the air cavity 8, and a second slide groove 10 is provided on the outer wall of the rotating shaft 2. There are two second slide grooves 10, which are respectively distributed on both sides of the air cavity 8. The second slide grooves 10 are connected to the air cavity 8 through the corresponding circular grooves 7.

[0041] A threaded barrel 12 is slidably connected to the inside of the circular groove 7, and the threaded barrel 12 is fixedly connected to the corresponding slip ring 9. The threaded barrel 12 cooperates with the first threaded rod 14, wherein a first square plate 11 is slidably provided in a second slide groove 10 away from the motor body 1, and the first square plate 11 is attached to the inner wall of the corresponding second slide groove 10, and the first square plate 11 is fixedly connected to the corresponding threaded barrel 12, and a square groove 15 is provided on the first square plate 11; a third party plate 19 is slidably provided in another second slide groove 10, and the third party plate 19 is fixedly connected to the corresponding threaded barrel 12, and the third party plate 19 is attached to the inner wall of the corresponding second slide groove 10.

[0042] During specific use, rubber pads are provided between the slip ring 9 and the inner wall of the air cavity 8 and between the slip ring 9 and the first threaded rod 14 to reduce wear and improve sealing.

[0043] During operation, the operator rotates the first threaded rod 14. Since the threads at both ends of the first threaded rod 14 are in opposite directions, and the threaded barrel 12 cooperates with the first threaded rod 14, and under the limiting action of the first square plate 11 and the third party plate 19, the two threaded barrels 12 move toward each other, causing the two slip rings 9 to move toward each other, and the gas between the two slip rings 9 enters the corresponding first slide groove 4 through the air hole 13, pushing multiple sliders 5 to slide outward at the same time and abut against the inner ring of the pulley 3, wherein the key teeth 6 are inserted into the keyway of the pulley 3 to radially position the pulley 3, and the outward sliding distance of the slider 5 is adjustable, which is suitable for pulleys 3 with different inner diameters.

[0044] In addition, the provision of structures such as the slip ring 9 and the slider 5 and the use of a method of rotating the first threaded rod 14 will not affect the drive motor compared to the prior art method of installing the pulley 3 by hammering.

[0045] In the actual production process, the position where the rotating shaft 2 and the pulley 3 are connected can be assembled and fixed by two parts, such as: after the air cavity 8, the second slide groove 10 and other structures are opened, the two parts are welded and fixed; and the rotating shaft 2 uses high-strength materials, such as alloy steel, to ensure the strength of use.

[0046] In order to further improve the stability of the positioning of the pulley 3, a first pressure plate 18 is provided on the side of the pulley 3 facing away from the motor body 1, and a second pressure plate 21 is provided on the side of the pulley 3 close to the motor body 1. When the first pressure plate 18 and the second pressure plate 21 move toward each other, they are used to axially position the pulley 3.

[0047] A third threaded rod 20 is threadedly connected to the third plate 19 , and the second pressing plate 21 is fixedly connected to the third threaded rod 20 .

[0048] When the first pressing plate 18 abuts against the outer wall of the pulley 3 , the first threaded rod 14 is limited by the limiting assembly to prevent the first threaded rod 14 from rotating in the reverse direction.

[0049] Specifically, the limiter assembly includes a second square plate 16, a second threaded rod 17, an outer groove 29, a U-shaped clip 30, a slide plate 31, a slide cylinder 32, a spring 33, a vertical plate 34, an inner groove 35, and a limiter 36. The second square plate 16 is inserted into the interior of the square groove 15, the second threaded rod 17 is threadedly connected to the second square plate 16, and the first pressure plate 18 is fixedly connected to the second threaded rod 17. The outer groove 29 is located at the end of the second threaded rod 17 away from the first pressure plate 18. The U-shaped clip 30 engages with the outer groove 29, which has a polygonal wall. When the U-shaped clip 30 is inserted into the outer groove 29, it rotates synchronously with the second threaded rod 17.

[0050] One end of the slide 31 is fixedly connected to the U-shaped card 30, and the other end of the slide 31 is slidably connected to the inside of the slide 32. The spring 33 is located inside the slide 32. One end of the spring 33 is fixedly connected to the slide 31, and the other end of the spring 33 is fixedly connected to the inner wall of the slide 32. The vertical plate 34 is fixedly connected to the outer wall of the slide 32. The vertical plate 34 and the slide 32 are L-shaped. The inner groove 35 is opened on the first threaded rod 14, and the limit block 36 is inserted into the inside of the inner groove 35. The limit block 36 is fixedly connected to the vertical plate 34. The wall surface of the inner groove 35 is polygonal. When the limit block 36 is inserted into the inner groove 35, the vertical plate 34 rotates synchronously with the first threaded rod 14.

[0051] When installing the pulley 3, the operator removes the first pressure plate 18 together with the stop assembly, and then inserts the pulley 3 onto the outside of the rotating shaft 2. The pulley 3 and the slider 5 are positioned so that the key teeth 6 correspond to the key slots of the pulley 3. The first pressure plate 18 and the stop assembly are configured as a movable structure, which does not affect the insertion of the pulley 3 onto the outside of the rotating shaft 2 for installation.

[0052] Then insert the second square plate 16 into the square groove 15, rotate the second threaded rod 17, drive the first pressure plate 18 to move toward the pulley 3, and make the first pressure plate 18 fit on the outer wall of one side of the pulley 3, and at the same time rotate the third threaded rod 20 to drive the second pressure plate 21 to move toward the pulley 3, and make the pulley 3 fit on the outer wall of the other side of the pulley 3. The first pressure plate 18 cooperates with the second pressure plate 21 to axially position the pulley 3, and the distance between the first pressure plate 18 and the second pressure plate 21 is adjustable, which is suitable for pulleys 3 of different thicknesses.

[0053] When the two slip rings 9 move toward each other, the second square plate 16 and the third square plate 19 move toward each other synchronously, thereby reducing the number of rotations of the second threaded rod 17 and the third threaded rod 20 .

[0054] In addition, the radial positioning and axial positioning of the pulley 3 are concentrated on the inner ring of the pulley 3, that is, the connection between the rotating shaft 2 and the pulley 3, which improves the stability of the connection without affecting the coordination between the pulley 3 and the belt and other structures.

[0055] During specific use, the slide 32 is pulled on the slide plate 31 in the direction away from the U-shaped card 30, and then the U-shaped card 30 is inserted into the outer groove 29, and the limit block 36 corresponds to the position of the inner groove 35. Then the slide 32 is released, and the return force of the spring 33 causes the slide 32 and the vertical plate 34 to move toward the U-shaped card 30, and the limit block 36 is inserted into the inside of the inner groove 35 to achieve a self-locking effect.

[0056] If the first threaded rod 14 tends to rotate in the opposite direction, that is, the two slip rings 9 may move in opposite directions, but the limit block 36, the vertical plate 34 and the second threaded rod 17 and other structures cooperate to prevent the first threaded rod 14 from rotating in the opposite direction; similarly, the second threaded rod 17 cannot rotate in the opposite direction, achieving the effect of synchronous self-locking of radial positioning and axial positioning.

[0057] Furthermore, the elastic supporting force of the spring 33 is appropriate. When the shaft 2 drives the pulley 3 to rotate at high speed, the spring 33 will not be deformed, thereby preventing the U-shaped card 30, the slide cylinder 32 and other structures from being thrown out.

[0058] By setting structures such as the slider 5, the first pressure plate 18 and the second pressure plate 21, it is suitable for pulleys 3 with different inner diameters, and the pulley 3 is radially and axially positioned at the same time, and the radial positioning and axial positioning are synchronously self-locked, thereby improving the applicability of the battery-driven motor.

[0059] To prevent the second pressure plate 21 from rotating in the opposite direction, and to account for a certain gap between the outer wall of the rotating shaft 2 and the inner ring of the pulley 3, a plurality of evenly distributed first through-holes 22 are provided on the first pressure plate 18. A plurality of evenly distributed second through-holes 23 are provided on the second pressure plate 21. A first round rod 24 is provided on the exterior of the rotating shaft 2. The number of first through-holes 22 and second through-holes 23 is appropriately configured so that one end of the first round rod 24 is inserted into one of the first through-holes 22 and the other end of the first round rod 24 is inserted into the corresponding second through-hole 23. A through-slot 27 is provided on the second square plate 16 for the first round rod 24 to pass through.

[0060] One end of the first round rod 24 close to the second square plate 16 is fixedly connected to the rotating rod 25, and the second round rod 26 is rotatably connected to the rotating rod 25. A torsion spring 28 is sleeved on the outside of the rotating rod 25, and one end of the torsion spring 28 is fixedly connected to the rotating rod 25, and the other end of the torsion spring 28 is fixedly connected to the second round rod 26.

[0061] Before installing the U-shaped card 30, the slide 32 and other structures, one of the first through hole 22 and the second through hole 23 corresponds to the position of the through slot 27. The first round rod 24 and the second round rod 26 are passed through the through slot 27, the gap between the outer wall of the rotating shaft 2 and the inner ring of the pulley 3, and one end of the first round rod 24 is inserted into the first through hole 22, and the other end of the first round rod 24 is inserted into the second through hole 23 (refer to Figure 6 ), the first pressing plate 18 and the second pressing plate 21 can only rotate synchronously to complete the positioning of the second pressing plate 21 and improve the stability of the positioning of the pulley 3.

[0062] When the second round rod 26 passes through the through slot 27, the operator controls the second round rod 26 to rotate on the rotating rod 25 so that the axis direction of the rotating rod 25 is consistent with the axis direction of the first round rod 24, which is convenient for passing through the through slot 27. After passing through the through slot 27, the operator releases the second round rod 26, and the restoring force of the torsion spring 28 causes the second round rod 26 to reset, presenting a certain tilt angle. The end of the second round rod 26 close to the second square plate 16 is staggered with the through slot 27, and under the limiting action of the second square plate 16 and the third plate 19, during the operation of the motor body 1, when the rotating shaft 2 drives the pulley 3 to rotate at high speed, the first round rod 24 and the second round rod 26 will not be thrown out directly.

[0063] The present invention further provides a motor drive system, which is applied to the above-mentioned battery-driven motor and further includes: a battery, a control circuit, and a power circuit.

[0064] Batteries provide electrical energy and are the energy source for the motor drive system.

[0065] Control circuit: Responsible for outputting control signals and regulating current and voltage by controlling the power switch, thereby controlling the operation of the motor.

[0066] Power circuit: Converts the control signal output by the control circuit into actual power output to drive the motor.

[0067] Working principle: The operator removes the first pressure plate 18 together with the limit assembly, and then inserts the pulley 3 into the outside of the rotating shaft 2. The position of the pulley 3 corresponds to that of the slider 5, and the key teeth 6 correspond to the key groove of the pulley 3.

[0068] Insert the second square plate 16 into the square groove 15; then rotate the first threaded rod 14. Since the threads at both ends of the first threaded rod 14 are in opposite directions, and the threaded barrel 12 cooperates with the first threaded rod 14, and under the limiting action of the first square plate 11 and the third plate 19, the two threaded barrels 12 move toward each other, so that the two slip rings 9 move toward each other, and the gas between the two slip rings 9 enters the corresponding first slide groove 4 through the air hole 13, pushing multiple sliders 5 to slide outward at the same time and abut against the inner ring of the pulley 3, wherein the key teeth 6 are inserted into the key groove of the pulley 3 to radially position the pulley 3, and the outward sliding distance of the slider 5 is adjustable, which is suitable for different inner rings. diameter of the pulley 3; then rotate the second threaded rod 17 to drive the first pressure plate 18 to move toward the pulley 3, and make the first pressure plate 18 fit on the outer wall of one side of the pulley 3, and at the same time rotate the third threaded rod 20 to drive the second pressure plate 21 to move toward the pulley 3, and make the pulley 3 fit on the outer wall of the other side of the pulley 3, the first pressure plate 18 cooperates with the second pressure plate 21 to axially position the pulley 3, and the distance between the first pressure plate 18 and the second pressure plate 21 is adjustable, which is suitable for pulleys 3 of different thicknesses; in addition, the radial positioning and axial positioning of the pulley 3 are concentrated on the inner ring of the pulley 3, which does not affect the cooperation between the pulley 3 and the belt and other structures.

[0069] At this time, one of the first through hole 22 and the second through hole 23 corresponds to the position of the through slot 27. The first round rod 24 and the second round rod 26 pass through the through slot 27, and one end of the first round rod 24 is inserted into the first through hole 22, and the other end of the first round rod 24 is inserted into the second through hole 23 (refer to Figure 6), the first pressure plate 18 and the second pressure plate 21 can only rotate synchronously; when the second round rod 26 passes through the through slot 27, the operator controls the second round rod 26 to rotate on the rotating rod 25, and the axis direction of the rotating rod 25 is consistent with the axis direction of the first round rod 24, which is convenient for passing through the through slot 27. After passing through the through slot 27, the operator releases the second round rod 26, and the reset force of the torsion spring 28 causes the second round rod 26 to reset, presenting a certain tilt angle, and the end of the second round rod 26 close to the second square plate 16 is staggered with the through slot 27, and under the limiting action of the second square plate 16 and the third party plate 19, during the operation of the motor body 1, when the rotating shaft 2 drives the pulley 3 to rotate at high speed, the first round rod 24 and the second round rod 26 will not be directly thrown out.

[0070] Then, the slide 32 is pulled on the slide plate 31 in the direction away from the U-shaped card 30, and the U-shaped card 30 is then inserted into the outer groove 29, and the limit block 36 corresponds to the position of the inner groove 35. Then, the slide 32 is released, and the return force of the spring 33 causes the slide 32 and the vertical plate 34 to move toward the U-shaped card 30, and the limit block 36 is inserted into the inside of the inner groove 35 to achieve a self-locking effect. If the first threaded rod 14 tends to rotate in the opposite direction, that is, the two slip rings 9 may move back to back, but the limit block 36, the vertical plate 34 and the second threaded rod 17 and other structures cooperate to prevent the first threaded rod 14 from rotating in the opposite direction; similarly, the second threaded rod 17 cannot rotate in the opposite direction, thereby achieving the effect of synchronous self-locking of radial positioning and axial positioning.

Claims

1. A battery-driven motor, comprising a motor body (1), characterized in that: The motor body (1) is provided with a rotating shaft (2) that cooperates with the pulley (3); An air cavity (8) is provided inside the rotating shaft (2), a first slide groove (4) is provided on the outer wall of the rotating shaft (2), an air hole (13) is provided on the inner wall of the first slide groove (4), the first slide groove (4) is communicated with the air cavity (8) through the air hole (13), a slider (5) for radially positioning the pulley (3) is provided inside the first slide groove (4), a first threaded rod (14) is rotatably provided on the rotating shaft (2), slip rings (9) are slidably provided on both sides of the air cavity (8), the first threaded rod (14) rotates, driving the two slip rings (9) to move toward each other, and the gas inside the air cavity (8) enters the inside of the first slide groove (4) through the air hole (13), pushing the slider (5) to slide outward and abut against the inner ring of the pulley (3); A first pressing plate (18) is provided on the side of the pulley (3) facing away from the motor body (1), and a second pressing plate (21) is provided on the side of the pulley (3) close to the motor body (1). The first pressing plate (18) and the second pressing plate (21) move toward each other to axially position the pulley (3). When the first pressing plate (18) abuts against the outer wall of the pulley (3), the first threaded rod (14) is limited by the limiting assembly to prevent the first threaded rod (14) from rotating in the reverse direction; Both ends of the air cavity (8) are provided with circular grooves (7), and the outer wall of the rotating shaft (2) is provided with a second sliding groove (10), and the second sliding grooves (10) are provided in two, and the two second sliding grooves (10) are respectively distributed on both sides of the air cavity (8), and the second sliding grooves (10) are connected to the air cavity (8) through the corresponding circular grooves (7), and the interior of the circular groove (7) is slidably connected with a threaded cylinder (12), and the threaded cylinder (12) is fixedly connected to the corresponding slip ring (9), and the threaded cylinder (12) cooperates with the first threaded rod (14), wherein a first square plate (11) is slidably provided in a second sliding groove (10) away from the motor body (1), and the first square plate (11) is fixedly connected to the corresponding threaded cylinder (12), and the first square plate (11) is provided with a square groove (15), and a third plate (19) is slidably provided in the other second sliding groove (10), and the third plate (19) is fixedly connected to the corresponding threaded cylinder (12); The limiting assembly includes a second square plate (16), a second threaded rod (17), an outer groove (29), a U-shaped card (30), a slide plate (31), a slide cylinder (32), a spring (33), a vertical plate (34), an inner groove (35) and a limiting block (36), wherein the second square plate (16) is inserted into the interior of the square groove (15), the second threaded rod (17) is threadedly connected to the second square plate (16), the first pressure plate (18) is fixedly connected to the second threaded rod (17), the outer groove (29) is opened at one end of the second threaded rod (17) away from the first pressure plate (18), the U-shaped card (30) is plugged into and matched with the outer groove (29), and the slide plate (31) One end of the slide (31) is fixedly connected to the U-shaped card (30), the other end of the slide (31) is slidably connected to the inside of the slide (32), the spring (33) is located inside the slide (32), one end of the spring (33) is fixedly connected to the slide (31), the other end of the spring (33) is fixedly connected to the inner wall of the slide (32), the vertical plate (34) is fixedly connected to the outer wall of the slide (32), the vertical plate (34) and the slide (32) are L-shaped, the inner groove (35) is opened on the first threaded rod (14), the limit block (36) is inserted into the inside of the inner groove (35), and the limit block (36) is fixedly connected to the vertical plate (34); A third threaded rod (20) is threadedly connected to the third plate (19), and the second pressing plate (21) is fixedly connected to the third threaded rod (20); The first pressing plate (18) is provided with a first through hole (22), the first through hole (22) is provided in a plurality, and the plurality of first through holes (22) are evenly distributed; the second pressing plate (21) is provided with a second through hole (23), the second through hole (23) is provided in a plurality, and the plurality of second through holes (23) are evenly distributed; a first round rod (24) is provided on the outside of the rotating shaft (2); one end of the first round rod (24) is inserted into one of the first through holes (22), and the other end of the first round rod (24) is inserted into the corresponding second through hole (23); the second square plate (16) is provided with a through slot (27) for the first round rod (24) to pass through; One end of the first round rod (24) close to the second square plate (16) is fixedly connected to a rotating rod (25), the rotating rod (25) is rotatably connected to a second round rod (26), and a torsion spring (28) is sleeved on the outside of the rotating rod (25); One of the sliders (5) is fixedly connected to a key tooth (6) that matches the key groove of the pulley (3).

2. The battery-driven motor according to claim 1, characterized in that: The first sliding grooves (4) are provided in plurality, and the plurality of first sliding grooves (4) are evenly distributed around the rotating shaft (2).

3. The battery-driven motor according to claim 1, characterized in that: The threads at both ends of the first threaded rod (14) are in opposite directions.

4. A motor drive system, characterized in that: The battery-driven motor according to any one of claims 1 to 3 further comprises: a battery, a control circuit, and a power circuit.

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