Multi-turn angular displacement magneto-dependent sensor with function of memorizing turn number after power failure

Abstract

The utility model discloses a multi-turn angular displacement magneto-dependent sensor with a function of memorizing the number of turns after power failure, which comprises a shell, a rotating shaft, magnetic steel, a printed board assembly and a planetary reducer transmission mechanism, and the planetary reducer transmission mechanism comprises a sun gear, a planet gear, an outer gear ring and a planet carrier. A rotating shaft gear is arranged at the inner end of the rotating shaft or the position close to the inner end of the rotating shaft to form a sun gear, a plurality of gear teeth are arranged on the circumferential inner wall of the shell to form an outer gear ring, a plurality of planet gears evenly distributed in the circumferential direction are connected with the sun gear and the outer gear ring in a meshed mode at the same time, the planet gears are connected with a planet carrier, and magnetic steel is installed on the planet carrier. According to the utility model, a planetary reducer transmission mechanism is integrated in the multi-turn angular displacement magneto-dependent sensor to realize a rotation speed reduction function, so that the multi-turn angular displacement magneto-dependent sensor has a turn number memory function after power failure, and meanwhile, only the magnetic induction signal detection device is a signal detection device, so that the detection error is reduced, and the detection precision is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a multi-turn angular displacement magnetic sensor, especially a multi-turn angular displacement magnetic sensor with a power-off turn number memory function. BACKGROUND

[0002] Angular displacement sensors (potentiometers) are widely used in ship, aviation, aerospace, weapon, ship and other whole machine systems, for controlling and feeding back angular displacement signals, and multi-turn angular displacement sensors are used for detecting multi-turn angular displacement.

[0003] Multi-turn angular displacement sensors include contact type multi-turn angular displacement sensors and non-contact type multi-turn angular displacement sensors, wherein the non-contact type multi-turn angular displacement sensors are mostly used as multi-turn angular displacement magnetic sensors, and the multi-turn angular displacement magnetic sensors are non-contact type multi-turn angular displacement sensors based on magnetic steel and magnetic induction elements.

[0004] The conventional multi-turn angular displacement magnetic sensor needs to continuously detect the angular displacement of the magnetic steel rotating with the rotating shaft to obtain real-time multi-turn angular displacement position information, and once restarted after power failure, it can only detect the angular displacement position information in the current turn, and cannot obtain the multi-turn angular displacement position information, which means that the turn number memory function after power failure will disappear.

[0005] To solve the above problems, the applicant has applied for a utility model patent with the patent number "ZL 202223097536.9" and the name "Multi-turn magnetic angular displacement sensor with no data loss after power failure", which uses an insulating sleeve, a guide plate, a brush and a strip-shaped resistor body to cooperate with each other to realize the contact sliding of the brush on the resistor body when the rotating shaft rotates, so as to detect the absolute position of the brush on the resistor body corresponding to the multi-turn rotation of the rotating shaft, and use it as the basis for judging the number of turns of the rotating shaft after power failure, that is, it has the function of remembering the number of turns after power failure.

[0006] However, the above-mentioned utility model patent needs to install two signal detection devices, i.e. magnetic induction signal detection device and brush signal detection device, in one sensor, and because each signal detection device has a certain detection error, the detection error will be significantly increased by two signal detection devices, especially in the connection interval of adjacent two turns, i.e. the position corresponding to the end of the last turn and the beginning of the next turn, the above-mentioned utility model may have the problem of turn number misjudgment. CONTENT OF THE UTILITY MODEL

[0007] The utility model aims to solve the above problems and provides a multi-turn angular displacement magnetic sensor with a power-off turn number memory function with only one signal detection device.

[0008] The utility model realizes the above-mentioned purpose through the following technical solutions:

[0009] A multi-turn angular displacement magnetic sensor with post-power-off turn number memory function, comprising a shell, a rotating shaft, a magnetic steel and a printed board assembly, the rotating shaft is installed on the shell through a bearing and its inner end is connected with the magnetic steel, the printed board assembly is placed in the shell and used for sensing the magnetic signal of the magnetic steel, the multi-turn angular displacement magnetic sensor with post-power-off turn number memory function further comprises a planetary reducer transmission mechanism, the planetary reducer transmission mechanism comprises a sun gear, a planet gear, an outer gear ring and a planet carrier, the inner end of the rotating shaft or a position close to the inner end of the rotating shaft is provided with a rotating shaft gear to form the sun gear, a plurality of teeth are arranged on the circumferential inner wall of the shell to form the outer gear ring, a plurality of planet gears uniformly distributed in the circumferential direction are simultaneously connected with the sun gear and the outer gear ring, the plurality of planet gears are respectively connected with the planet carrier, and the magnetic steel is installed on the planet carrier. The planetary reducer transmission mechanism is a mature technology, the mutual connection structures among the sun gear, the planet gear, the outer gear ring and the planet carrier are all prior art, and the focus of the present application is to integrate the planetary reducer transmission mechanism in the multi-turn angular displacement magnetic sensor to realize the rotation deceleration function.

[0010] As preferred, in order to facilitate processing and assembly and improve the stability of the planetary reducer transmission mechanism, the shell comprises a middle shell, a first end shell and a second end shell, the cylindrical middle shell is connected with the first end shell and the second end shell at both ends respectively, a plurality of teeth are arranged on the circumferential inner wall of the middle shell to form the outer gear ring, the rotating shaft passes through the center through hole of the first end shell and is connected with the hole wall of the center through hole through a first bearing, the inner end of the rotating shaft is connected with the planet carrier through a second bearing, and the rotating shaft gear is arranged on the rotating shaft close to the inner end to form the sun gear.

[0011] As preferred, in order to facilitate reliable limiting of the planet carrier to avoid axial movement of the magnetic steel during rotation, the second end shell is connected with the circumferential inner wall of the corresponding end of the middle shell, a partition plate is arranged between the second end shell and the planet carrier, the planet carrier is limited by the inner end of the rotating shaft and the partition plate and cannot move in the axial direction of the rotating shaft, and the printed board assembly is installed in the second end shell.

[0012] As preferred, in order to facilitate packaging of the second end shell, an end cover is installed at one end of the second end shell away from the middle shell, and the lead wire of the printed board assembly passes through the corresponding through hole on the end cover.

[0013] As preferred, in order to facilitate installation of the magnetic steel, a mounting groove is arranged in the middle of one end of the planet carrier close to the second end shell, and the magnetic steel is installed in the mounting groove.

[0014] As a preference, in order to improve the transmission accuracy and efficiency of the planetary gear, the planetary gear is three.

[0015] The utility model discloses the beneficial effect lies in:

[0016] The utility model discloses a multi -circle angular displacement magnetic sensor with the function of the number of turns memory after power failure, which belongs to the technical field of sensor, and relates to a multi -circle angular displacement magnetic sensor with the function of the number of turns memory after power failure, which comprises a rotating shaft, a magnetic steel, a sensor and a magnetic induction signal detection device. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the main view of the multi -circle angular displacement magnetic sensor with the function of the number of turns memory after power failure of the utility model,

[0018] Figure 2 It is the transmission principle structure schematic drawing of the planetary reducer drive mechanism of the multi -circle angular displacement magnetic sensor with the function of the number of turns memory after power failure of the utility model.

[0019] Figure 3 It is the transmission principle structure schematic drawing of the planetary reducer drive mechanism of the multi -circle angular displacement magnetic sensor with the function of the number of turns memory after power failure of the utility model. DETAILED DESCRIPTION

[0020] The utility model will be further described in connection with the drawings:

[0021] As Figure 1As shown in the utility model, the multi-turn angular displacement magnetic sensor with the turn number memory function after power failure comprises a shell (refer to the shell 4, the first end shell 2 and the second end shell 13 in the following description), a rotating shaft 1, a magnetic steel 9, a printed board assembly 11 and a planetary reducer transmission mechanism, the rotating shaft 1 is installed on the shell through bearings (refer to the first bearing 3 and the second bearing 7 in the following description) and the inner end thereof is connected with the magnetic steel 9, the printed board assembly 11 is arranged in the shell and is used for sensing the magnetic signal of the magnetic steel 9, the planetary reducer transmission mechanism comprises a sun gear, a planet gear 6, an outer gear ring and a planet carrier 8, the inner end of the rotating shaft 1 or the position close to the inner end is provided with a rotating shaft gear 5 (the rotating shaft gear 5 in the figure is formed by arranging a convex ring on the rotating shaft 1 and arranging gear teeth on the circumferential outer wall of the convex ring) to form the sun gear, a plurality of gear teeth are arranged on the circumferential inner wall of the shell to form the outer gear ring, a plurality of planet gears 6 which are uniformly distributed in the circumferential direction are simultaneously connected with the sun gear and the outer gear ring in meshing mode, the plurality of planet gears 6 are connected with the planet carrier 8 respectively, and the magnetic steel 9 is installed on the planet carrier 8.

[0022] As Figure 1 shown, the utility model discloses the following more optimized specific structure:

[0023] In order to facilitate processing and assembly and improve the stability of the planetary reducer transmission mechanism, the shell comprises a middle shell 4, a first end shell 2 and a second end shell 13, the two ends of the cylindrical middle shell 4 are connected with the first end shell 2 and the second end shell 13 respectively, a plurality of gear teeth are arranged on the circumferential inner wall of the middle shell 4 to form the outer gear ring, the rotating shaft 1 passes through the center through hole of the first end shell 2 and is connected with the hole wall of the center through hole through the first bearing 3, the inner end of the rotating shaft 1 is connected with the planet carrier 8 through the second bearing 7, and the position close to the inner end of the rotating shaft 1 is provided with the rotating shaft gear 5 to form the sun gear.

[0024] In order to facilitate reliable limiting of the planet carrier 8 to avoid axial movement of the magnetic steel 9 in the rotating process, the circumferential inner wall of the corresponding end of the second end shell 13 and the middle shell 4 is connected, a partition plate 10 is arranged between the second end shell 13 and the planet carrier 8, the planet carrier 8 is limited by the inner end of the rotating shaft 1 and the partition plate 10 and cannot move in the axial direction of the rotating shaft 1, and the printed board assembly 11 is installed in the second end shell 13.

[0025] In order to facilitate packaging of the second end shell 13, an end cover 14 is installed at the end of the second end shell 13 away from the middle shell 4, and the lead 12 of the printed board assembly 11 passes through the corresponding through hole on the end cover 14.

[0026] In order to facilitate installation of the magnetic steel 9, a mounting groove is arranged in the middle of the end of the planet carrier 8 close to the second end shell 13, and the magnetic steel 9 is installed in the mounting groove.

[0027] To improve the transmission accuracy and efficiency of planetary gear 6, there are three planetary gears 6.

[0028] like Figures 1-3 As shown, during processing, the reduction ratio of the planetary reducer transmission mechanism is first determined based on the actual number of rotations of the shaft 1, and the corresponding planetary reducer transmission mechanism is selected for processing. For example, if the actual number of rotations of the shaft 1 is 5, then the reduction ratio of the planetary reducer transmission mechanism is 5:1. In application, the outer end of the shaft 1 is connected to the rotating part of the device being tested. The rotating part drives the shaft 1 to rotate, thereby driving the shaft gear 5 to rotate synchronously. The shaft gear 5 drives the three planetary gears 6 to rotate synchronously. Under the action of the outer gear ring of the inner housing 4, the three planetary gears 6 rotate around the center line of the shaft gear 5 (which is also the center line of the inner housing 4), thereby driving the planet carrier 8 and the magnet 9 to rotate at the reduced speed. The magnetic induction element in the printed circuit board assembly 11 detects the changing magnetic field signal of the magnet 9 and transmits it to the external processor through the lead wire 12. The processor determines the relative position of the magnet 9 in one circle based on the signal. Based on the reduction ratio of the planetary reducer transmission mechanism, the processor can calculate the number of rotations of the shaft 1 and the rotation angle in the current circle using conventional calculation methods, thus realizing the multi-circle angular displacement detection function. When the sensor is powered off and then restarted, the magnetic field signal detected by the magnetic induction element in the printed circuit board assembly 11 corresponds to the relative position of the magnet 9 in the circumference of the circle. The number of rotations of the rotating shaft 1 and the rotation angle in the current circle can be obtained. This realizes the function of remembering the number of rotations after power failure. At the same time, there is only one signal detection device, the magnetic induction signal detection device, which reduces the detection error and improves the detection accuracy. Even in the connecting interval between two adjacent rotations of the rotating shaft 1, there will be no problem of misjudging the number of rotations.

[0029] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A multi-turn angular displacement magnetic sensor with a power-off turn count memory function, comprising a housing, a rotating shaft, a magnet, and a printed circuit board assembly, wherein the rotating shaft is mounted on the housing via a bearing and its inner end is connected to the magnet, and the printed circuit board assembly is placed inside the housing and used to sense the magnetic signal of the magnet, characterized in that: The multi-turn angular displacement magnetic sensor with the power-off turn number memory function further comprises a planetary reducer transmission mechanism, the planetary reducer transmission mechanism comprises a sun gear, a planet gear, an outer gear ring and a planet carrier, the inner end of the rotating shaft or a position close to the inner end of the rotating shaft is provided with a rotating shaft gear to form the sun gear, a plurality of teeth are arranged on the circumferential inner wall of the shell to form the outer gear ring, a plurality of planet gears uniformly distributed in the circumferential direction are simultaneously connected in meshing with the sun gear and the outer gear ring, the plurality of planet gears are respectively connected with the planet carrier, and the magnetic steel is mounted on the planet carrier.

2. The multi-turn angular displacement magnetic sensor with power-off turn count memory function according to claim 1, characterized in that: The shell comprises a middle shell, a first end shell and a second end shell, the two ends of the cylindrical middle shell are connected with the first end shell and the second end shell respectively, a plurality of teeth are arranged on the circumferential inner wall of the middle shell to form the outer gear ring, the rotating shaft passes through the center through hole of the first end shell and is connected with the hole wall of the center through hole through a first bearing, the inner end of the rotating shaft is connected with the planet carrier through a second bearing, and the rotating shaft gear is arranged on the position close to the inner end of the rotating shaft to form the sun gear.

3. The multi-turn angular displacement magnetic sensor with power-off turn count memory function according to claim 2, characterized in that: The second end shell is connected with the circumferential inner wall of the corresponding end of the middle shell, a partition plate is arranged between the second end shell and the planet carrier, the planet carrier is limited by the inner end of the rotating shaft and the partition plate and cannot move in the axial direction of the rotating shaft, and the printed board assembly is mounted in the second end shell.

4. The multi-turn angular displacement magnetic sensor with power-off turn count memory function according to claim 3, characterized in that: An end cover is mounted on the end of the second end shell away from the middle shell, and the lead wire of the printed board assembly passes through the corresponding through hole on the end cover.

5. The multi-turn angular displacement magnetic sensor with power-off turn count memory function according to any one of claims 2-4, characterized in that: A middle part of one end of the planet carrier close to the second end shell is provided with a mounting groove, and the magnetic steel is mounted in the mounting groove.

6. The multi-turn angular displacement magnetic sensor with power-off turn count memory function according to any one of claims 2-4, characterized in that: The planet gears are three.

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