A hysteresis motor that meets the requirements of low self-positioning torque

Abstract

This utility model discloses a hysteresis motor with low self-positioning torque, comprising a stator assembly, a rotor assembly, a base shell, a bottom cover, a clutch assembly, and a main drive wheel. The stator assembly is connected to the outer wall of the base shell, and the bottom cover is fixed to the open end of the base shell. The rotor assembly includes a magnetic core, a rotor shaft, and a rotor body mounted on one end of the rotor shaft. The magnetic core is disposed within the stator assembly, and the rotor shaft passes through the magnetic core and is slidably connected to the inner cavity of the magnetic core. A rotor gear is connected to the other end of the rotor shaft. The clutch assembly is connected to the bottom cover and located within the base shell, and the main drive wheel is disposed within the bottom cover. This utility model provides a hysteresis motor with low self-positioning torque, which can effectively reduce the self-positioning torque of the hysteresis motor, extend the overall lifespan of the motor, and allow it to be used in high-temperature environments, reducing the impact of rotor ring performance degradation caused by high temperatures on the hysteresis motor.

Description

Technical Field

[0001] This utility model relates to a hysteresis motor that meets the requirements of low self-positioning torque, and belongs to the field of motor technology. Background Technology

[0002] Currently, most products using hysteresis motors utilize the characteristic of very low self-positioning torque after power failure. This type of hysteresis motor is assembled into a spring-loaded actuator. When power is applied, the spring in the actuator opens, allowing the actuator to operate. After power failure, the spring's contraction closes the actuator, causing the hysteresis motor to rotate in the opposite direction. The self-positioning torque of the hysteresis motor after power failure mainly consists of residual magnetism generated by the rotor rings made of soft magnetic material in the rotor assembly, and frictional resistance generated by the interaction of gears. Due to the characteristics of this type of hysteresis motor, a high self-positioning torque is required; the lower the self-positioning torque, the better the performance in the actuator.

[0003] In addition, since the actuator operates in a cycle of being powered on and off, it is sometimes used in high-temperature environments (above 70°C). Due to the relatively poor thermal stability of the FeCrCo alloy material of the rotor ring, an important component in the hysteresis motor, the residual magnetism of the rotor ring will increase at high temperatures. After the motor is powered off, the self-positioning torque will increase in the high-temperature environment, and the spring in the actuator will no longer be able to pull the hysteresis motor to reverse, thus shortening the overall life of the actuator. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a hysteresis motor that meets the requirements of low self-positioning torque. This can effectively reduce the self-positioning torque of the hysteresis motor, extend the service life of the whole machine, and at the same time, it can be used in high temperature environments, reducing the impact of rotor ring performance degradation caused by high temperature on the hysteresis motor.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: A hysteresis motor with low self-positioning torque includes a stator assembly, a rotor assembly, a bottom housing, a bottom cover, a clutch assembly, and a main drive wheel. The stator assembly is connected to the outer wall of the bottom housing, and the bottom cover is fixed to the open end of the bottom housing. The rotor assembly includes a magnetic core, a rotor shaft, and a rotor body mounted on one end of the rotor shaft. The magnetic core is disposed within the stator assembly. The rotor shaft passes through the magnetic core and is slidably connected to the inner cavity of the magnetic core. A rotor gear is connected to the other end of the rotor shaft. The clutch assembly is connected to the bottom cover and located within the bottom shell. The main drive wheel is disposed within the bottom cover. When the motor is powered on, the rotor shaft squeezes the clutch assembly towards the bottom shell during rotation until the rotor gear meshes with the main drive wheel; when the motor is powered off, the clutch assembly springs away from the bottom shell until the rotor gear disengages from the main drive wheel.

[0006] Furthermore, the clutch assembly includes a steel ball, a spring, and a base. The base is located inside the bottom shell. The end of the base near the rotor shaft is provided with an inlet and outlet for the steel ball to extend and retract. The end of the base away from the rotor shaft is connected to the bottom cover. The steel ball and the spring are both disposed in the inner cavity of the base. One end of the spring abuts against the bottom cover, and the other end of the spring abuts against the steel ball.

[0007] Furthermore, the outer diameter of the inlet / outlet is smaller than the outer diameter of the base.

[0008] Furthermore, a shaft tooth blocking position is provided on any one of the teeth of the rotor gear, and the shaft tooth blocking position is located on the side of the rotor gear near the outer wall of the bottom cover; the large gear of the main drive wheel is used to mesh with the rotor gear for transmission, and a main drive wheel blocking position is provided on any one of the teeth of the large gear of the main drive wheel, and the main drive wheel blocking position is located on the side of the large gear of the main drive wheel near the outer wall of the bottom cover; the main drive wheel blocking position is used to radially limit and axially guide the shaft tooth blocking position.

[0009] Furthermore, the outer wall of the bottom shell is provided with a through hole for the rotor gear to pass through, and the steel ball is arranged opposite to the through hole.

[0010] Furthermore, linear bearings are respectively provided at both ends of the inner cavity of the magnetic core, and the rotor shaft is slidably connected to the inner cavity of the magnetic core through the linear bearings.

[0011] Furthermore, a groove is provided at one end of the magnetic core near the bottom cover, which provides space for the rotor gear to stay after the motor is powered off.

[0012] Furthermore, it also includes a gear transmission assembly, which is disposed inside the bottom shell and meshes with the pinion of the main drive wheel for transmission.

[0013] Furthermore, it also includes an output component, which includes a first output gear and a second output gear. The first output gear is disposed inside the bottom shell and meshes with a gear transmission component. The shaft of the first output gear extends out from the bottom cover and is connected to the second output gear.

[0014] Furthermore, it also includes an end cover, which is connected to the stator assembly, and both the stator assembly and the rotor assembly are located in the inner cavity of the end cover.

[0015] By adopting the above technical solution, this utility model adds a clutch assembly consisting of a spring, steel balls, and a base. It utilizes the principle that when the rotor assembly moves within the stator assembly after power-on, it applies pressure to the steel balls and spring. When power is off, the pressure disappears, and the spring's own elasticity springs the rotor assembly open, causing the rotor gears and main drive wheels on the rotor assembly to disengage and cease meshing. In this way, the self-positioning torque generated by the residual magnetism of the rotor rings no longer affects the motor; only the frictional torque generated by the mutual rotation of the gears remains. This significantly reduces the motor's self-positioning torque. Simultaneously, the hysteresis motor of this utility model can operate normally in high-temperature environments, solving the problem in existing hysteresis motors where poor rotor ring thermal stability leads to performance degradation and increased self-positioning in high-temperature environments, causing the actuator to malfunction. Furthermore, as the hysteresis motor ages, with increased wear and resistance, a small self-positioning torque significantly extends the overall lifespan of the machine. Attached Figure Description

[0016] Figure 1 An exploded view of the hysteresis motor of this utility model that meets the requirement of low self-positioning torque; Figure 2 This is a schematic diagram showing the fit between the rotor shaft and the rotor body of this utility model; Figure 3 This is a schematic diagram of the internal structure of the hysteresis motor of this utility model after it is powered on; Figure 4 This is a schematic diagram of the internal structure of the hysteresis motor of this utility model after power is cut off; Figure 5 This is a schematic diagram of the engagement between the rotor gear and the magnetic core of the hysteresis motor after power is cut off. Figure 6 This is a schematic diagram showing the engagement of the rotor gears of the hysteresis motor of this invention after it is energized, disengaging from the magnetic core. Figure 7 This is a schematic diagram of the structure of the large gear of the main drive wheel of this utility model; Figure 8 for Figure 7 Enlarged view of Part I; Figure 9 This is a schematic diagram of the rotor gear of this utility model; Figure 10 for Figure 9 Enlarged view of Part II; Figure 11 This is a schematic diagram showing the cooperation between the shaft tooth blocking position and the main drive wheel blocking position when the hysteresis motor of this utility model is energized; Figure 12 This is a schematic diagram showing the complete meshing of the large gear of the main drive wheel and the rotor gear of this utility model. Figure 13 This is a structural diagram of the base of this utility model before assembly; Figure 14 This is a schematic diagram of the structure of the base after assembly of this utility model; Figure 15 This is a schematic diagram showing the state of the clutch assembly after the hysteresis motor of this utility model is energized; Figure 16 This is a schematic diagram showing the state of the clutch assembly of the hysteresis motor after power is cut off according to this utility model. Figure 17 This is a schematic diagram showing the assembly of the main drive wheel, gear transmission assembly, and output assembly of this utility model. Detailed Implementation

[0017] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] like Figure 1 As shown, this embodiment provides a hysteresis motor that meets the requirements of low self-positioning torque. It includes a stator assembly 1, a rotor assembly 2, a bottom shell 3, a bottom cover 4, a clutch assembly 5, a main drive wheel 6, a gear transmission assembly 7, an output assembly 8, and an end cover 9.

[0019] The stator assembly 1 is riveted to the outer wall of the base shell 3, and the end cover 9 is snapped into the side wall of the stator assembly 1. Both the stator assembly 1 and the rotor assembly 2 are located in the inner cavity of the end cover 9, which provides protection for the rotor assembly 2 and the stator assembly 1. The clutch assembly 5, the main drive wheel 6, and the gear transmission assembly 7 are all disposed inside the base shell 3. The base cover 4 is riveted to the open end of the base shell 3, and the clutch assembly 5 is connected to the base cover 4. In this embodiment, the main drive wheel 6 is a double gear, and the gear transmission assembly 7 meshes with the pinion of the main drive wheel 6 for transmission. Specifically, as shown... Figures 1-3 As shown, the rotor assembly 2 in this embodiment includes a magnetic core 21, a rotor shaft 22, and a rotor body 23 mounted on one end of the rotor shaft 22. The magnetic core 21 is disposed within the stator assembly 1, as shown... Figures 3-6 As shown, the rotor shaft 22 passes through the magnetic core 21. Linear bearings 211 are respectively provided at both ends of the inner cavity of the magnetic core 21, and the rotor shaft 22 is slidably connected to the inner cavity of the magnetic core 21 through the linear bearings 211. The other end of the rotor shaft 22 is connected to a rotor gear 24, which is interference-fitted to the rotor shaft 22 and is press-fitted onto the rotor shaft 22 by a pneumatic press.

[0020] When the motor is powered on, as Figure 3As shown, stator assembly 1 generates an alternating magnetic field through excitation windings and pole claws made of magnetically conductive material. When energized, it drives rotor assembly 2 to rotate and output torque. Because the centerlines of stator assembly 1 and rotor assembly 2 are not aligned and there is radial misalignment, the air gap magnetic field will generate an axial component, thereby subjecting rotor assembly 2 to axial magnetic pull. This causes rotor shaft 22 to move towards the bottom shell 3 during rotation, gradually squeezing clutch assembly 5 until rotor gear 24 meshes with the large gear of main drive wheel 6. The small gear of main drive wheel 6 then drives output assembly 8 to rotate through gear transmission assembly 7.

[0021] When the motor is powered off, such as Figure 4 As shown, the clutch assembly 5 springs the rotor assembly 2 away from the bottom housing 3 until the rotor gear 24 disengages from the main drive wheel 6. This eliminates the self-positioning torque generated by the residual magnetism of the rotor ring 231, thus preventing it from affecting the motor's self-positioning torque. Only the frictional resistance generated by the mutual rotation of the gears in the main drive wheel 6, gear transmission assembly 7, and output assembly 8 effectively reduces the self-positioning torque of the hysteresis motor, extending the overall lifespan of the machine. Furthermore, because it solves the problem of high temperature affecting the performance degradation of the rotor ring, this structure can also be used in high-temperature environments exceeding 70°C.

[0022] like Figures 1-3 As shown, the rotor body 23 of this embodiment includes a rotor ring 231, an aluminum bracket 233 connected to the rotor ring 231, and a bushing 232 disposed on the aluminum bracket 233. The rotor shaft 22 is installed inside the bushing 232. The aluminum bracket 233 provides support for the rotor ring 231, which is made of a soft magnetic material FeCrCo. When the motor is powered on, the stator assembly 1 generates excitation, and the rotor ring 231 of the rotor assembly 2 interacts with the excitation magnetic field to generate a rotational torque. When the power is off, the soft magnetic material has very low remanence due to its low coercivity. At this time, the self-positioning torque of the rotor assembly 2 is very small, and the spring 52 in the actuator generates a contraction force to close the actuator. This will drive the rotor assembly 2 to reverse through the output assembly 8 and the gear transmission assembly 7, so that the actuator returns to its initial state.

[0023] Since the residual magnetism of the rotor ring 231 is determined by the soft magnetic material and processing technology, it is very difficult and costly to improve. Therefore, this embodiment focuses on improving the self-positioning torque by adding a clutch assembly 5. After power is cut off, the rotor assembly 2 is disengaged from the main drive wheel 6, so that the self-positioning torque generated by the residual magnetism of the rotor ring 231 no longer affects the self-positioning torque of the motor. The process is simple, the cost is low, and it is easier to implement.

[0024] The rotor gear 24 is press-fitted onto the rotor shaft 22. The distance from the plane of the rotor gear 24 to the head plane of the rotor shaft 22 is 0.45-0.5 mm, preferably 0.47 mm in this embodiment. After power is off, the rotor gear 24 disengages from the main drive wheel 6 by a distance of 2.2-2.3 mm, preferably 2.25 mm in this embodiment. After power is on, the rotor gear 24 meshes with the main drive wheel 6 with a clearance distance of 0-0.5 mm.

[0025] The axial clearance between the linear bearing 211 and the rotor gear 24 is 0.1-0.5 mm, depending on the position of the rotor shaft gear fixed on the rotor shaft.

[0026] like Figure 1 , 15 As shown in Figure 16, the clutch assembly 5 of this embodiment includes a steel ball 51, a spring 52, and a base 53. The base 53 is located inside the bottom shell 3, and an inlet 54 for the steel ball 51 to extend and retract is provided at one end of the base 53 near the rotor shaft 22. Figure 13 , 14 As shown, the end of the base 53 furthest from the rotor shaft 22 is provided with a pair of support legs 55. The support legs 55 are integrally formed with the base 53. The support legs 55 on the base 53 are inserted into the insertion holes in the bottom cover 4. The support legs 55 are riveted using a riveting machine to fix the base 53 to the bottom cover 4. Figure 15 , 16 As shown, both the steel ball 51 and the spring 52 are disposed within the inner cavity of the base 53. One end of the spring 52 abuts against the bottom cover 4, and the other end of the spring 52 abuts against the steel ball 51. Figure 1 As shown, a through hole 31 for the rotor gear 24 to pass through is provided on the outer wall of the bottom shell 3, and the steel ball 51 is arranged opposite to the through hole 31. Figure 15 , 16 As shown, the base 53 is riveted to the bottom cover 4, then the spring 52 is placed inside the base 53, and finally the steel ball 51 is placed on the spring 52. After the motor is powered off, the elastic force of the spring 52 in its extended state can push the steel ball 51 to the inlet 54 of the base 53, with a part of the steel ball 51 protruding from the inlet 54. During the extension of the spring 52, the steel ball 51 is always in contact with the rotor shaft 22. After the motor is powered on, the rotor shaft 22 compresses the spring 52 while pushing against the steel ball 51. After the motor is powered off, the spring 52 applies a reaction force to the steel ball 51, which causes the rotor shaft 22 to spring away, causing the rotor gear 24 to disengage from the main drive wheel 6.

[0027] like Figure 9 , 10 As shown, in this embodiment, a shaft tooth blocking position 241 is provided on any one of the teeth of the rotor gear 24. The shaft tooth blocking position 241 is located on the side of the rotor gear 24 near the outer wall of the bottom cover 4. Figure 7 , 8As shown, in this embodiment, a main drive wheel blocking position 61 is provided on any one of the teeth of the large gear of the main drive wheel 6. The main drive wheel blocking position 61 is located on the side of the large gear of the main drive wheel 6 near the outer wall of the bottom cover 4. The main drive wheel blocking position 61 has the same shape as the shaft tooth blocking position 241. The main drive wheel blocking position 61 is used to radially limit and axially guide the shaft tooth blocking position 241.

[0028] When the motor is powered on, the rotor assembly 2 rotates at a relatively slow speed. Due to the magnetic pull, the rotor gear 24 on the rotor shaft 22 rotates while slowly approaching the main drive wheel 6. Figure 11 As shown, the gear tooth blocking position 241 on the rotor gear 24 will first contact the main drive wheel blocking position 61 on the main drive wheel 6. At this time, the main drive wheel blocking position 61 radially limits the gear tooth blocking position 241. Simultaneously, during rotation, the main drive wheel blocking position 61 provides axial guidance for the gear tooth blocking position 241. The gear tooth blocking position 241 will continue to move along the main drive wheel blocking position 61 until the rotor shaft 22 completely squeezes the steel balls 51 into the base 53. At this point, the gear tooth blocking position 241 completely disengages from the main drive wheel blocking position 61. Figure 12 As shown, the rotor gear 24 meshes with the large gear of the main drive wheel 6. When the motor is powered off, the rotor shaft 22 is springed away by the spring 52 and the steel ball 51, and then the reverse action process as described above when the motor is powered on is performed.

[0029] like Figure 5 , 6 As shown, in this embodiment, a groove 212 is provided at one end of the magnetic core 21 near the bottom cover 4. The groove 212 is dug into the inner cavity of the magnetic core 21 to a depth of 2.5-3mm, preferably 2.7mm in this embodiment. The groove 212 is used to provide space for the rotor gear 24 to stay after the motor is powered off and the rotor shaft 22 is popped open.

[0030] like Figure 15 As shown, in this embodiment, the outer diameter of the inlet / outlet 54 of the base 53 is smaller than the outer diameter of the base 53, thereby creating a clearance between the inlet / outlet 54 and the end of the base 53. Figure 1 As shown, after the rotor gear 24 meshes with the large gear of the main drive wheel 6 and continues to rotate, the shaft tooth blocking position 241 on the rotor gear 24 will rotate accordingly, and the clearance position provides space for the shaft tooth blocking position 241 to rotate.

[0031] like Figure 3 , 17As shown, the output component 8 in this embodiment includes a first output gear 81 and a second output gear 82. The first output gear 81 is disposed inside the bottom shell 3 and meshes with the gear transmission component 7. The shaft 811 of the first output gear 81 is relatively long and can extend out from the bottom cover 4. The second output gear 82 is then fixed to the extended portion of the shaft 811. Finally, the second output gear 82 works in conjunction with the actuator to transmit the torque output provided by the rotor assembly 2 to the actuator, thereby opening the actuator. The function of the output component 8 is to amplify the torque generated by the rotor assembly 2, typically by 100 to 500 times.

[0032] like Figure 1 , 17 As shown, the gear transmission assembly 7 in this embodiment uses multiple double gears that mesh sequentially, and preferably two double gears in this embodiment.

[0033] The specific embodiments described above further illustrate the technical problems, technical solutions, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hysteresis motor that satisfies low self-positioning torque, characterized in that: It includes a stator assembly (1), a rotor assembly (2), a bottom shell (3), a bottom cover (4), a clutch assembly (5), and a main drive wheel (6). The stator assembly (1) is connected to the outer wall of the bottom shell (3), and the bottom cover (4) is fixed to the open end of the bottom shell (3). The rotor assembly (2) includes a magnetic core (21), a rotor shaft (22), and a rotor body (23) installed at one end of the rotor shaft (22). The magnetic core (21) is disposed in the stator assembly (1). The rotor shaft (22) passes through the magnetic core (21) and is slidably connected to the inner cavity of the magnetic core (21). The other end of the rotor shaft (22) is connected to a rotor gear (24). The clutch assembly (5) is connected to the bottom cover (4) and is located in the bottom shell (3). The main drive wheel (6) is disposed in the bottom cover (4). When the motor is powered on, the rotor shaft (22) squeezes the clutch assembly (5) towards the bottom shell (3) during rotation until the rotor gear (24) meshes with the main drive wheel (6); when the motor is powered off, the clutch assembly (5) springs away from the bottom shell (3) from the rotor assembly (2) until the rotor gear (24) disengages from the main drive wheel (6).

2. The hysteresis motor with low self-positioning torque according to claim 1, characterized in that: The clutch assembly (5) includes a steel ball (51), a spring (52) and a base (53). The base (53) is located inside the bottom shell (3). The end of the base (53) near the rotor shaft (22) is provided with an inlet (54) for the steel ball (51) to extend and retract. The end of the base (53) away from the rotor shaft (22) is connected to the bottom cover (4). The steel ball (51) and the spring (52) are both located in the inner cavity of the base (53). One end of the spring (52) abuts against the bottom cover (4), and the other end of the spring (52) abuts against the steel ball (51).

3. The hysteresis motor with low self-positioning torque according to claim 2, characterized in that: The outer diameter of the inlet / outlet (54) is smaller than the outer diameter of the base (53).

4. The hysteresis motor with low self-positioning torque according to claim 1, characterized in that: A tooth blocking position (241) is provided on any one of the tooth plates of the rotor gear (24), and the tooth blocking position (241) is located on the side of the rotor gear (24) near the outer wall of the bottom cover (4); the large gear of the main drive wheel (6) is used to mesh with the rotor gear (24) for transmission, and a main drive wheel blocking position (61) is provided on any one of the tooth plates of the large gear of the main drive wheel (6), and the main drive wheel blocking position (61) is located on the side of the large gear of the main drive wheel (6) near the outer wall of the bottom cover (4); the main drive wheel blocking position (61) is used to radially limit and axially guide the tooth blocking position (241).

5. The hysteresis motor with low self-positioning torque according to claim 2, characterized in that: The outer wall of the bottom shell (3) is provided with a through hole (31) for the rotor gear (24) to pass through, and the steel ball (51) is arranged opposite to the through hole (31).

6. The hysteresis motor with low self-positioning torque according to claim 1, characterized in that: Linear bearings (211) are respectively provided at both ends of the inner cavity of the magnetic core (21), and the rotor shaft (22) is slidably connected to the inner cavity of the magnetic core (21) through the linear bearings (211).

7. The hysteresis motor with low self-positioning torque according to claim 1, characterized in that: The magnetic core (21) has a groove (212) at one end near the bottom cover (4), which provides space for the rotor gear (24) to stay after the motor is powered off.

8. The hysteresis motor with low self-positioning torque according to claim 4, characterized in that: It also includes a gear transmission assembly (7), which is disposed inside the bottom shell (3) and meshes with the pinion of the main drive wheel (6).

9. The hysteresis motor with low self-positioning torque according to claim 8, characterized in that: It also includes an output component (8), which includes a first output gear (81) and a second output gear (82). The first output gear (81) is disposed in the bottom shell (3). The first output gear (81) meshes with the gear transmission component (7) for transmission. The shaft (811) of the first output gear (81) extends out from the bottom cover (4) and is connected to the second output gear (82).

10. The hysteresis motor with low self-positioning torque according to claim 1, characterized in that: It also includes an end cover (9), which is connected to the stator assembly (1), and both the stator assembly (1) and the rotor assembly (2) are located in the cavity of the end cover (9).

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