Magnetic multi-circle angle sensor

Abstract

The utility model relates to a magnetic multi-turn angle sensor, an input shaft is fixed on a shell through a bearing, a central gear is connected on the input shaft, a secondary gear, a first transmission gear and a second transmission gear are all duplicate gears, the central gear is meshed with a lower gear of the secondary gear, and the central gear is meshed with a lower gear of the second transmission gear. An upper gear of the secondary gear is meshed with an upper gear of a first transmission gear, a lower gear of the first transmission gear is in meshed transmission with a lower gear of a second transmission gear through a transition gear, and a first output shaft penetrates through an inner hole of the first transmission gear and an inner hole of a first magnet seat and then is fixed to the shell. The second output shaft penetrates through an inner hole of the second transmission gear and an inner hole of the second magnet seat and then is fixed to the shell, magnets are arranged on the first magnet seat and the second magnet seat respectively, the circuit board assembly comprises a magnetic induction chip, and the magnetic induction chip and the magnets are coaxially arranged. The multi-turn absolute value encoder is simplified in structure, small in measuring range and ultra-small in size, and the application scene of the multi-turn absolute value encoder can be widened.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of sensor, concretely relates to a magnetic multi-turn angle sensor. BACKGROUND

[0002] The magnetic multi-turn absolute value type rotary angle sensor is usually used in the automatic control system, servo system, information feedback system in the fields of industrial automation, precision instruments and meters, electric actuators, numerical control machine tools, weapons and equipment and aerospace. Due to the progress of modern control technology, the magnetic multi-turn absolute value type rotary angle sensor with reliable stability, higher precision and better performance is usually needed in the above system. But most of the magnetic rotary magnetic multi-turn absolute value type rotary angle sensors are relatively large in size, are not suitable for the working application environment with limited space, affect installation and even can not be assembled. Most of the traditional magnetic multi-turn absolute value type rotary angle sensors are large in diameter, the minimum diameter is above 48mm, and the number of turns is more, which is not friendly to the application environment with small size and small range.

[0003] In summary, it is urgent to provide a magnetic multi-turn angle sensor with simplified structure, small range and ultra-small size, which can widen the application scene of multi-turn absolute value encoder. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a magnetic multi-turn angle sensor with simplified structure, small range and ultra-small size, which can widen the application scene of multi-turn absolute value encoder.

[0005] The above-mentioned purpose is realized by the following technical scheme: a magnetic multi-turn angle sensor, comprising a shell, a variable speed gear mechanism, a circuit board assembly, an input shaft, a first output shaft, a second output shaft, a first magnet seat, a second magnet seat and a magnet, the input shaft is fixed on the shell through a bearing, the variable speed gear mechanism comprises a center gear, a transition gear, a secondary gear, a first transmission gear and a second transmission gear, the center gear is connected on the input shaft, the secondary gear, the first transmission gear and the second transmission gear are all double gear, the center gear is engaged with the lower gear of the secondary gear, the upper gear of the secondary gear is engaged with the upper gear of the first transmission gear, the lower gear of the first transmission gear is engaged with the lower gear of the second transmission gear through the transition gear, the first output shaft is fixed on the shell after penetrating the inner hole of the first transmission gear and the inner hole of the first magnet seat, the second output shaft is fixed on the shell after penetrating the inner hole of the second transmission gear and the inner hole of the second magnet seat, the first magnet seat and the second magnet seat are fixedly connected with the end face of the first transmission gear and the second transmission gear respectively, the first magnet seat and the second magnet seat are respectively provided with the magnet, the circuit board assembly comprises a magnetic induction chip, and the magnetic induction chip is coaxially arranged with the magnet.

[0006] The utility model is used to solve the application environment of small volume small range multi -turn absolute value sensor, the input shaft is arranged in the middle of casing through bearing, bearing is installed in the bearing chamber of casing front end, is clearance fit, simultaneously uses anaerobic glue to stick fixedly, bearing inner race and input shaft outer ring purchase interference fit and anaerobic glue stick fixedly, to support fixed input shaft, and the inner race of input shaft and central gear is interference fit, power is transmitted to the secondary gear, first drive gear, transition gear and second drive gear in proper order through input shaft to central gear, first drive gear and second drive gear are driven to first output shaft and second output shaft respectively, and then drive the magnet on first output shaft and second output shaft to rotate respectively, thereby produce the magnetic field of periodic change, magnetic induction chip senses the magnetic field change, and then through certain and algorithm can obtain certain angle value, output to the equipment that needs to control, adopt the technical scheme of the utility model, through reference secondary gear magnet output value analysis obtains the multi -turn absolute value angle of other magnet. From the mechanical absolute uniqueness of each position has been realized, there is no risk of power -down data loss, and the product is small, especially suitable for narrow space. In the specific application process, 0.2 small module gear design scheme of 2 stage reduction can be provided, such design can make the product appearance size Phi 28mm*15mm relatively much smaller, on the basis of not affecting the encoder output performance, widen the application scene of multi -turn absolute value encoder. The end surface of first drive gear and second drive gear is glued fixed with magnet seat. In the specific application process, the secondary gear and the magnet seat are coaxially arranged and fixed by epoxy glue.

[0007] Further technical solutions are that the speed ratio of the first output shaft to the input shaft is 3, and the speed ratio of the second output shaft to the first output shaft is 16. In the application process, each speed ratio can be set by setting the linear speed ratio of the upper and lower gears of the secondary gear, the first drive gear, and the second drive gear.

[0008] Further technical solutions are that an intermediate transmission shaft is arranged between the first output shaft and the second output shaft, the transition gear is arranged on the intermediate transmission shaft, the speed ratio of the second output shaft to the intermediate transmission shaft is 4, and the speed ratio of the intermediate transmission shaft to the first output shaft is 4. In this way, the speed ratio of the first output shaft to the input shaft is equal to 3, and the speed ratio of the second output shaft to the first output shaft is equal to 16. An intermediate transmission shaft is arranged between the first output shaft and the second output shaft, and the speed ratios before and after the intermediate transmission shaft are both equal to 4. Therefore, the maximum number of turns of this design is 3*4*4=48 turns. In the application process, the magnet with a speed ratio of 3 corresponds to a single-turn output of the chip, and the magnet with a speed ratio of 48 corresponds to a multi-turn output of the chip.

[0009] Further technical solutions are that the first magnet seat and the second magnet seat are respectively provided with accommodating notches, and the magnets are fixed in the accommodating notches.

[0010] Further technical solutions are that the first magnet seat and the second magnet seat are respectively provided with accommodating notches, and the magnets are fixed in the accommodating notches.

[0011] Further technical solutions are that the input shaft, the first output shaft and the second output shaft are all made of non-magnetic conductive materials.

[0012] Further technical solutions are that the circuit board assembly further comprises a printed board, and the printed board is in communication connection with the magnetic induction chip.

[0013] Further technical solutions are that the shell is provided with a rear cover plate, and the rear cover plate and the shell are sealed through glue pouring.

[0014] Compared with the prior art, the structure is simplified, small range, ultra-small volume and structure optimization, and the application scene of the multi-turn absolute value encoder is widened without affecting the output performance of the encoder. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated herein in their entirety.

[0016] Figure 1 A cross-sectional view of the magnetic multi-turn angle sensor according to an embodiment of the application;

[0017] Figure 2 An exploded view of the magnetic multi-turn angle sensor according to an embodiment of the application;

[0018] Figure 3 A top view of the variable speed gear mechanism transmission of the magnetic multi-turn angle sensor according to an embodiment of the application;

[0019] Figure 4 A bottom view of the variable speed gear mechanism transmission of the magnetic multi-turn angle sensor according to an embodiment of the application;

[0020] Figure 5 The structure diagram of the double gear involved in an embodiment of the utility model.

[0021] In the drawing:

[0022] 1 shell 2 input shaft 3 first output shaft 4 second output shaft

[0023] 5 first magnet seat 6 second magnet seat 7 magnet 8 center gear

[0024] 9 transition gear 10 secondary gear 11 first transmission gear 12 second transmission gear

[0025] 13 circuit board assembly 14 magnetic isolation ring 15 back cover plate 16 bearing Specific implementation

[0026] The utility model will be described in detail below in combination with the drawings, and the description in this part is only exemplary and explanatory, and should not have any limiting effect on the protection scope of the utility model. In addition, those skilled in the art can combine the features in the embodiments in this document and the features in different embodiments according to the description in this document.

[0027] The utility model implementation is as follows, referring to Figures 1-5 A magnetic multi-turn angle sensor, including shell 1, gear mechanism, circuit board assembly 13, input shaft 2, first output shaft 3, second output shaft 4, first magnet seat 5, second magnet seat 6 and magnet 7, the input shaft 2 is fixed on the shell 1 through bearing 16, the gear mechanism includes center gear 8, transition gear 9, secondary gear 10, first transmission gear 11 and second transmission gear 12, the center gear 8 is connected on the input shaft 2, the secondary gear 10, first transmission gear 11 and second transmission gear 12 are all double gear, the center gear 8 is engaged with the lower gear of the secondary gear 10, the upper gear of the secondary gear 10 is engaged with the upper gear of the first transmission gear 11, the lower gear of the first transmission gear 11 is engaged with the lower gear of the second transmission gear 12 through the transition gear 9 and drives, the first output shaft 3 is fixed on the shell 1 after the inner hole of the first transmission gear 11 and the inner hole of the first magnet seat 5 are connected, the second output shaft 4 is fixed on the shell 1 after the inner hole of the second transmission gear 12 and the inner hole of the second magnet seat 6 are connected, the first magnet seat 5 and second magnet seat 6 are fixedly connected with the end face of the first transmission gear 11 and second transmission gear 12 respectively, the first magnet seat 5 and second magnet seat 6 are respectively provided with the magnet 7, the circuit board assembly 13 includes magnetic induction chip, the magnetic induction chip is coaxially arranged with the magnet 7.

[0028] The utility model is used to solve the application environment of small volume and small range multi-turn absolute value sensor, like Figures 1-4 , the input shaft 2 is set in the middle of the shell 1 through the bearing 16, the bearing 16 is installed in the bearing 16 chamber in the front end of the shell 1, is the clearance fit, and is fixed with anaerobic glue simultaneously;The inner ring of the bearing 16 and the outer ring of the input shaft 2 are fixed with anaerobic glue with interference fit, to support and fix the input shaft 2, and the inner ring of the input shaft 2 and the central gear 8 are interference fit;Power is transmitted to the secondary gear 10, the first transmission gear 11, the transition gear 9 and the second transmission gear 12 in turn through the input shaft 2 to the central gear 8, the first transmission gear 11 and the second transmission gear 12 are driven to the first output shaft 3 and the second output shaft 4 respectively, and then the first output shaft 3 and the second output shaft 4 on the magnet 7 are driven to rotate, thereby generating a periodically changing magnetic field, the magnetic induction chip senses the magnetic field change, and a certain angle value can be obtained through a certain algorithm, and is output to the required equipment to control, the technical scheme of the utility model is adopted, and the multi-turn absolute value angle of other magnets 7 is obtained by analyzing the output value of the secondary gear 10 magnet 7. The absolute uniqueness of each position is mechanically realized, there is no risk of power failure data loss, and the product is small, especially suitable for narrow space. In the specific application process, a 0.2 small modulus gear design scheme of two-stage reduction can be provided, and such design can make the product size Φ28mm*15mm relatively much smaller, on the basis of not affecting the output performance of the encoder, the application scene of the multi-turn absolute value encoder is widened. The end surface of the first transmission gear 11 and the second transmission gear 12 is fixed with the magnet 7 seat glue. In the specific application process, the secondary gear 10 and the magnet 7 seat are coaxially arranged and fixed with epoxy glue.

[0029] On the basis of the above embodiment, in another embodiment of the utility model, the speed ratio of the first output shaft 3 and the input shaft 2 is 3, and the speed ratio of the second output shaft 4 and the first output shaft 3 is 16. In the application process, each speed ratio can be set by setting the linear velocity ratio of the upper and lower gears of the secondary gear 10, the first transmission gear 11 and the second transmission gear 12.

[0030] On the basis of the above embodiment, in another embodiment of the utility model, like Figure 1Wherein, the intermediate transmission shaft is arranged between the first output shaft 3 and the second output shaft 4, the transition gear 9 is arranged on the intermediate transmission shaft, the speed ratio of the second output shaft 4 to the intermediate transmission shaft is 4, and the speed ratio of the intermediate transmission shaft to the first output shaft 3 is 4. In this way, the speed ratio of the first output shaft 3 to the input shaft 2 is equal to 3, and the speed ratio of the second output shaft 4 to the first output shaft 3 is equal to 16, wherein the intermediate transmission shaft is arranged between the first output shaft 3 and the second output shaft 4, and the speed ratio of the front and rear of the intermediate transmission shaft is equal to 4, so that the maximum number of turns is 3*4*4=48 turns, and in the application process, the magnet 7 with a speed ratio of 3 corresponds to single-turn output of the chip, and the magnet 7 with a speed ratio of 48 corresponds to multi-turn output of the chip.

[0031] On the basis of the above embodiment, another embodiment of the utility model provides Figure 2 , the first magnet seat 5 and the second magnet seat 6 are respectively provided with accommodating notches, and the magnet 7 is fixed in the accommodating notch.

[0032] On the basis of the above embodiment, another embodiment of the utility model provides Figure 1 , the first magnet seat 5 and the second magnet seat 6 are respectively provided with accommodating notches, and the magnet 7 is fixed in the accommodating notch.

[0033] On the basis of the above embodiment, another embodiment of the utility model provides that the input shaft 2, the first output shaft 3 and the second output shaft 4 are all prepared from non-magnetic conductive material.

[0034] On the basis of the above embodiment, another embodiment of the utility model provides that the circuit board assembly 13 further includes a printed board, and the printed board is in communication connection with the magnetic induction chip. In the application process, the circuit board assembly 13 is installed at the rear end of the shell 1 and is fixed by screws. The magnetic induction chip is placed on one side of the magnet 7 and is coaxial with the magnet 7. The input shaft 2 drives the magnet 7 to rotate, so that a periodic change magnetic field is generated. The magnetic induction chip senses the change of the magnetic field and transmits the signal to the printed board. The printed board can obtain a certain angle value through a certain algorithm and outputs the angle value to the required equipment for control.

[0035] On the basis of the above embodiment, another embodiment of the utility model provides Figure 1 And Figure 2 The shell 1 is provided with a rear cover plate 15, and the rear cover plate 15 is sealed with the shell 1 by pouring glue. In this way, the sealing property of the product is greatly guaranteed, and the IP65 protection level requirement can be realized.

[0036] The above merely is preferred implementation manner of the present application, it should be pointed out, for ordinary skilled person in the technical field, on the premise of not departing from the principle of the present application, can also make several improvements and refinements, these improvements and refinements also should be regarded as the protection scope of the present application.

Claims

1. A magnetic multi-turn angle sensor, characterized in that The application relates to a speed change mechanism, which comprises a shell, a speed change gear mechanism, a circuit board assembly, an input shaft, a first output shaft, a second output shaft, a first magnet seat, a second magnet seat and a magnet, the input shaft is fixed on the shell through a bearing, the speed change gear mechanism comprises a center gear, a transition gear, a secondary gear, a first transmission gear and a second transmission gear, the center gear is connected to the input shaft, the secondary gear, the first transmission gear and the second transmission gear are all double gears, the center gear is engaged with a lower gear of the secondary gear, an upper gear of the secondary gear is engaged with an upper gear of the first transmission gear, a lower gear of the first transmission gear is engaged with a lower gear of the second transmission gear through the transition gear, the first output shaft is fixed on the shell after penetrating the inner hole of the first transmission gear and the inner hole of the first magnet seat, the second output shaft is fixed on the shell after penetrating the inner hole of the second transmission gear and the inner hole of the second magnet seat, the first magnet seat and the second magnet seat are fixedly connected with the end faces of the first transmission gear and the second transmission gear respectively, the first magnet seat and the second magnet seat are respectively provided with the magnet, and the circuit board assembly comprises a magnetic induction chip which is coaxially arranged with the magnet.

2. The magnetic multi-turn angle sensor according to claim 1, characterized in that The speed ratio of the first output shaft to the input shaft is 3, and the speed ratio of the second output shaft to the first output shaft is 16.

3. The magnetic multi-turn angle sensor according to claim 2, characterized in that An intermediate transmission shaft is arranged between the first output shaft and the second output shaft, the transition gear is arranged on the intermediate transmission shaft, the speed ratio of the second output shaft to the intermediate transmission shaft is 4, and the speed ratio of the intermediate transmission shaft to the first output shaft is 4.

4. The magnetic multi-turn angle sensor according to any one of claims 1 to 3, characterized in that The first magnet seat and the second magnet seat are respectively provided with accommodating notches, and the magnet is fixed in the accommodating notches.

5. The magnetic multi-turn angle sensor according to any one of claims 1 to 3, characterized in that The first magnet seat and the second magnet seat are respectively provided with magnetic separation rings.

6. The magnetic multi-turn angle sensor according to claim 5, characterized in that The input shaft, the first output shaft and the second output shaft are all made of non-magnetic material.

7. The magnetic multi-turn angle sensor according to claim 6, characterized in that The circuit board assembly further comprises a printed board which is in communication connection with the magnetic induction chip.

8. The magnetic multi-turn angle sensor according to claim 7, characterized in that The shell is provided with a rear cover plate which is sealed with the shell through glue pouring.

Images