Linear actuator structure of dual-magnetic-pole angle Hall sensor

Abstract

The invention discloses a double-magnetic-pole angle Hall sensor linear actuator structure which comprises a ring magnet arranged at the end of a rotor output shaft and an angle Hall sensor arranged beside the ring magnet, the angle Hall sensor is fixed to a tail cover of a stator assembly, and the detection face of the angle Hall sensor faces the ring magnet and is parallel to the central axis of the output shaft. The circular ring magnet rotates along with rotation of the rotor, the output shaft performs linear displacement, and the angle Hall sensor performs voltage value output. The device has the advantages of being simple in overall structure, small in signal detection fluctuation, good in stability, high in economical efficiency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and specifically to a linear actuator structure with a dual-pole angle Hall sensor. Background Art

[0002] Existing linear actuators, such as Figure 1 shown, generally include a brush holder assembly, a tail cover assembly (magnet assembly, guide post spring, PCBA assembly, shrapnel, etc.), a stator assembly (including magnets, stator housing, large ball bearings, large ball bearing brackets), a rotor assembly (including a rotor and silicon steel sheets, hollow shaft, commutator), an output shaft, etc.;

[0003] Working principle and characteristics: When the magnet assembly in the tail cover assembly makes a linear movement, there is a vibration phenomenon, and thus there will be a slight fluctuation in the sensor detection signal; in addition, when the magnet assembly makes a linear movement, there is also a radial slop clearance, which generates friction and affects the durability of the product; there are many components and a complex structure, and the assembly process is cumbersome, increasing the cost investment; for example, the magnet assembly is an injection molding process, and the large ball bearings are also injection molded in the brush holder.

[0004] The information disclosed in the above background art section is only for increasing the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art already known to those of ordinary skill in the art. Summary of the Invention

[0005] Aiming at the above-mentioned existing defects, the purpose of the present invention is to provide a linear actuator structure with a dual-pole angle Hall sensor, which has the characteristics of simple overall structure, small signal detection fluctuation, good stability, and high economy.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A linear actuator structure with a dual-pole angle Hall sensor includes an annular magnet arranged at the end of the rotor output shaft, and an angle Hall sensor arranged beside the annular magnet. The angle Hall sensor is fixed on the tail cover of the stator assembly and the detection surface faces the annular magnet and is arranged parallel to the central axis of the output shaft. The annular magnet rotates with the rotation of the rotor, the output shaft makes a linear displacement movement, and the angle Hall sensor outputs a voltage value signal.

[0008] Further, an oil-containing bearing is arranged in the middle of the rotor output shaft, which is more economical and durable.

[0009] Further, the distance between the nearest point of the angle Hall sensor and the annular magnet is 1 - 1.2 mm.

[0010] Further, the inner diameter of the annular magnet is 3 - 4 mm, the outer diameter is 6 - 7 mm, and the height is 3 - 4 mm.

[0011] Further, the ring magnet is a permanent magnet made of neodymium iron boron.

[0012] Further, the ring magnet is tightly adhesively bonded to the end of the rotor output shaft through a high-temperature resistant adhesive.

[0013] Further, the high-temperature resistant adhesive is a high-temperature resistant epoxy adhesive.

[0014] Further, the angular Hall sensor has a square sheet structure, and the detection surface size is 6 - 7 mm in length and 5 - 6 mm in width.

[0015] The working principle of the present invention is as follows: Through the linear displacement of the rotor output shaft, the rotor assembly rotates, and the corresponding ring magnetic coil also rotates accordingly. Then, the angular Hall sensor detects the magnetic field change and outputs a voltage value signal. The ring magnetic coil has extremely small vibration and is a non-contact structure, overcoming the vibration influence and making the Hall sensor signal detection fluctuate little.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The dual-pole angular Hall sensor linear actuator of the present invention, compared with the traditional structure, has a new end cap structure, eliminating components such as guide post springs, magnet assemblies, and shrapnel, reducing the processes of each component, making the overall structure more concise, with fewer assembly processes, high space utilization rate, replacing the original large ball bearings with more economical and durable oil-impregnated bearings. The overall size of the output shaft becomes shorter, which not only saves raw materials but also facilitates the guarantee of machining dimensions. The overall structure of the present invention has the characteristics of simple overall structure, small signal detection fluctuation, good stability, and high economy. Description of the Drawings

[0018] Figure 1 is the structure of a traditional motor linear actuator;

[0019] Figure 2 is the schematic structural diagram of the dual-pole angular Hall sensor linear actuator according to the embodiment of the present invention;

[0020] Figure 3 is the positional relationship diagram of the angular Hall sensor and the ring magnet according to the embodiment of the present invention;

[0021] In the figure, 1 - end cap; 2 - stator assembly; 3 - rotor; 4 - output shaft; 6 - ring magnet; 7 - angular Hall sensor; 8 - oil-impregnated bearing. Detailed Embodiments

[0022] To describe the technical content, achieved objectives, and effects of the present invention in detail, the following is described in conjunction with embodiments and with reference to the accompanying drawings. In the description of this embodiment, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0023] Embodiment 1

[0024] As Figure 2-3 shown, a linear actuator structure of a dual - pole angle Hall sensor includes an annular magnet 6 disposed at the end of the output shaft 4 of the rotor 3, and an angle Hall sensor 7 disposed beside the annular magnet 6. The angle Hall sensor 7 is fixed on the end cover 1 of the stator assembly 2 and the detection surface is arranged parallel to the output shaft axis facing the annular magnet 6. The annular magnet 6 rotates following the rotation of the rotor 3, the output shaft 4 makes a linear displacement, and the angle Hall sensor 7 outputs a voltage value signal.

[0025] The working principle is as follows: Through the linear displacement of the output shaft 4 of the rotor 3, the rotor 3 rotates, and accordingly the annular magnetic ring 6 also rotates. Then the angle Hall sensor 7 detects the magnetic field change and outputs a voltage value signal. The vibration of the annular magnetic ring 6 is extremely small, and it has a non - contact structure with the angle Hall sensor 7, overcoming the influence of vibration and making the signal detection of the angle Hall sensor 7 have small fluctuations.

[0026] In this embodiment, an oil - impregnated bearing 8 is provided in the middle of the output shaft 4 of the rotor 3, which is more economical and durable.

[0027] In this embodiment, the distance between the nearest point of the angle Hall sensor 7 and the annular magnet 6 is 1 mm.

[0028] In this embodiment, the inner diameter of the annular magnet 6 is 3 mm, the outer diameter is 6 mm, and the height is 3 mm.

[0029] In this embodiment, the annular magnet 6 is a permanent magnet made of neodymium iron boron material.

[0030] In this embodiment, the annular magnet 6 is tightly adhesively bonded to the end of the output shaft 4 of the rotor 3 through a high - temperature - resistant adhesive.

[0031] In this embodiment, the high - temperature - resistant adhesive is a high - temperature - resistant epoxy adhesive.

[0032] In this embodiment, the angle Hall sensor 7 is a square - sheet structure, and the size of the detection surface is 6 mm in length and 5 mm in width.

[0033] Embodiment 2

[0034] AsFigure 2-3 As shown in the figure, a linear actuator structure of a dual-pole angle Hall sensor includes a ring magnet 6 provided at the end of the output shaft 4 of the rotor 3, and an angle Hall sensor 7 provided beside the ring magnet 6. The angle Hall sensor 7 is fixed on the end cover 1 of the stator assembly 2 and the detection surface faces the ring magnet 6 and is arranged parallel to the central axis of the output shaft. The ring magnet 6 rotates following the rotation of the rotor 3, the output shaft 4 makes a linear displacement, and the angle Hall sensor 7 outputs a voltage value signal.

[0035] The working principle is as follows: Through the linear displacement of the output shaft 4 of the rotor 3, the rotor 3 rotates, and accordingly the ring magnetic coil 6 also rotates. Then the angle Hall sensor 7 detects the magnetic field change and outputs a voltage value signal. The vibration of the ring magnetic coil 6 is extremely small, and it has a non-contact structure with the angle Hall sensor 7, overcoming the influence of vibration and making the signal detection of the angle Hall sensor 7 have small fluctuations.

[0036] In this embodiment, an oil-impregnated bearing 8 is provided in the middle of the output shaft 4 of the rotor 3, which is more economical and durable.

[0037] In this embodiment, the distance between the closest point of the angle Hall sensor 7 and the ring magnet 6 is 1.2 mm.

[0038] In this embodiment, the inner diameter of the ring magnet 6 is 4 mm, the outer diameter is 7 mm, and the height is 4 mm.

[0039] In this embodiment, the ring magnet 6 is a permanent magnet made of neodymium iron boron material.

[0040] In this embodiment, the ring magnet 6 is tightly glued to the end of the output shaft 4 of the rotor 3 through a high-temperature resistant adhesive.

[0041] In this embodiment, the high-temperature resistant adhesive is a high-temperature resistant epoxy adhesive.

[0042] In this embodiment, the angle Hall sensor 7 has a square sheet structure, and the size of the detection surface is 7 mm in length and 6 mm in width.

[0043] Embodiment 3

[0044] As Figure 2-3 shown in the figure, a linear actuator structure of a dual-pole angle Hall sensor includes a ring magnet 6 provided at the end of the output shaft 4 of the rotor 3, and an angle Hall sensor 7 provided beside the ring magnet 6. The angle Hall sensor 7 is fixed on the end cover 1 of the stator assembly 2 and the detection surface faces the ring magnet 6 and is arranged parallel to the central axis of the output shaft. The ring magnet 6 rotates following the rotation of the rotor 3, the output shaft 4 makes a linear displacement, and the angle Hall sensor 7 outputs a voltage value signal.

[0045] The working principle is as follows: Through the linear displacement of the output shaft 4 of the rotor 3, the rotor 3 rotates, and the corresponding circular ring magnetic coil 6 also rotates accordingly. Then, the angular Hall sensor 7 detects the magnetic field change and outputs a voltage value signal. The circular ring magnetic coil 6 has extremely small vibration, and it has a non-contact structure with the angular Hall sensor 7, overcoming the influence of vibration and making the signal detection of the angular Hall sensor 7 have small fluctuations.

[0046] In this embodiment, an oil-impregnated bearing 8 is provided in the middle of the output shaft 4 of the rotor 3, which is more economical and durable.

[0047] In this embodiment, the distance between the angular Hall sensor 7 and the nearest point of the circular ring magnet 6 is 1 mm.

[0048] In this embodiment, the inner diameter of the circular ring magnet 6 is 4 mm, the outer diameter is 7 mm, and the height is 4 mm.

[0049] In this embodiment, the circular ring magnet 6 is a permanent magnet made of neodymium iron boron material.

[0050] In this embodiment, the circular ring magnet 6 is tightly adhesively bonded to the end of the output shaft 4 of the rotor 3 through a high-temperature resistant adhesive.

[0051] In this embodiment, the high-temperature resistant adhesive is a high-temperature resistant epoxy adhesive.

[0052] In this embodiment, the angular Hall sensor 7 has a square sheet structure, and the detection surface size is 7 mm in length and 6 mm in width.

[0053] Embodiment 4

[0054] As Figure 2-3 shown, a dual-pole angular Hall sensor linear actuator structure includes a circular ring magnet 6 provided at the end of the output shaft 4 of the rotor 3, and an angular Hall sensor 7 provided beside the circular ring magnet 6. The angular Hall sensor 7 is fixed on the end cover 1 of the stator assembly 2 and the detection surface faces the circular ring magnet 6 and is arranged parallel to the output shaft central axis. The circular ring magnet 6 rotates following the rotation of the rotor 3, the output shaft 4 makes a linear displacement movement, and the angular Hall sensor 7 outputs a voltage value signal.

[0055] The working principle is as follows: Through the linear displacement of the output shaft 4 of the rotor 3, the rotor 3 rotates, and the corresponding circular ring magnetic coil 6 also rotates accordingly. Then, the angular Hall sensor 7 detects the magnetic field change and outputs a voltage value signal. The circular ring magnetic coil 6 has extremely small vibration, and it has a non-contact structure with the angular Hall sensor 7, overcoming the influence of vibration and making the signal detection of the angular Hall sensor 7 have small fluctuations.

[0056] In this embodiment, an oil-impregnated bearing 8 is provided in the middle of the output shaft 4 of the rotor 3, which is more economical and durable.

[0057] In this embodiment, the distance between the angle Hall sensor 7 and the nearest point of the ring magnet 6 is 1.2 mm.

[0058] In this embodiment, the inner diameter of the ring magnet 6 is 4 mm, the outer diameter is 6 mm, and the height is 4 mm.

[0059] In this embodiment, the ring magnet 6 is a permanent magnet made of neodymium iron boron.

[0060] In this embodiment, the ring magnet 6 is tightly glued to the end of the output shaft 4 of the rotor 3 through a high-temperature resistant adhesive.

[0061] In this embodiment, the high-temperature resistant adhesive is a high-temperature resistant epoxy adhesive.

[0062] In this embodiment, the angle Hall sensor 7 is a square sheet structure, and the detection surface size is 6 mm in length and 6 mm in width.

[0063] Compared with the traditional motor linear actuator structure in Embodiments 1-4, since the dual-pole angle Hall sensor linear actuator rotates through the rotor assembly, then the ring magnet follows the rotation of the rotor assembly, the output shaft makes a linear displacement, and the angle Hall sensor outputs a voltage value signal, overcoming the vibration influence and making the Hall sensor signal detection fluctuate less. The overall structure of the dual-pole angle Hall sensor linear actuator of the present invention has the characteristics of simple overall structure, small signal detection fluctuation, good stability, and high economy.

[0064] Although the present invention has been described in detail with specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A dual-pole angle Hall sensor linear actuator structure, characterized in that: It includes a circular ring magnet arranged at the end of the rotor output shaft, and an angle Hall sensor arranged next to the circular ring magnet. The angle Hall sensor is fixed on the tail cover of the stator assembly and its detection surface is arranged parallel to the output shaft center axis facing the circular ring magnet. The circular ring magnet rotates with the rotation of the rotor, the output shaft moves with linear displacement, and the angle Hall sensor outputs a voltage value signal.

2. According to claim 1, a dual-pole angle Hall sensor linear actuator structure is characterized by: An oil-containing bearing is arranged in the middle of the rotor output shaft.

3. According to claim 1, a dual-pole angle Hall sensor linear actuator structure is characterized by: The distance between the angle Hall sensor and the closest point of the circular magnet is 1 to 1.2 mm.

4. According to claim 1, a dual-pole angle Hall sensor linear actuator structure is characterized by: The inner diameter of the circular ring magnet is 3-4 mm, the outer diameter is 6-7 mm, and the height is 3-4 mm.

5. According to claim 1, a dual-pole angle Hall sensor linear actuator structure is characterized by: The annular magnet is a permanent magnet made of neodymium iron boron.

6. The dual-pole angle Hall sensor linear actuator structure according to claim 1, characterized in that: The annular magnet is glued to the end of the rotor output shaft by means of high temperature resistant glue.

7. A dual-pole angle Hall sensor linear actuator structure according to claim 6, characterized in that: The high temperature resistant glue is high temperature resistant epoxy glue.

8. The dual-pole angle Hall sensor linear actuator structure according to claim 1, characterized in that: The angle Hall sensor is a square sheet structure, and the detection surface size is 6-7 mm in length and 5-6 mm in width.

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