Small-size inductance mechanical multi-turn encoder
Through the split structure and electromagnetic induction principle, the problem of difficult to miniaturize existing mechanical multi-turn encoder is solved, and the encoder design with high security and flexible installation is realized, and multiple turns counting is supported.
Patent Information
- Application Number
- CN202422300426.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-20
AI Technical Summary
It is difficult to achieve miniaturization of existing mechanical multi-turn encoders, and there are limitations on miniaturization of photoelectric and magnetoelectric encoders, and mechanical multi-turn encoders are difficult to replace in situations with high security.
It adopts a split structure design, including the rotor and the stator, and there is an air gap between the rotor and the stator. A reduction gear set, a magnet and a magnetic induction chip are provided in the stator. A single-turn count is realized through the principle of electromagnetic induction. The reduction gear set adopts small-module double gears and axial layered distribution. The magnet and the magnetic induction chip cooperate to detect the number of turns information.
A small-size mechanical multi-turn encoder has high safety and flexible installation characteristics, and supports counting capabilities of 4096 to 65536 turns.
Smart Images
Figure CN223122238U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of split encoders, in particular to a small-size inductive mechanical multi-turn encoder. Background Art
[0002] A split encoder is a device that encodes original signals into digital signals and is widely used in fields such as industrial automation, robotics, medical devices, and automotive electronics. This encoder is divided into two parts and placed on mechanical switches or rotating components respectively. By measuring the relative movement between the two parts, the movement information is converted into a digital signal output to achieve precise measurement, control, and transmission. It has the characteristics of simple structure, low cost, small volume, flexible installation, and high environmental tolerance.
[0003] Existing mechanical multi-turn encoders are usually mainly optoelectronic and magnetoelectric; optoelectronic encoders are difficult to miniaturize due to their complex optical systems, while magnetoelectric ones are also limited in miniaturization due to the presence of magnets. Although the volume of the magnetoelectric scheme is slightly smaller than that of the optoelectronic scheme, the performance of the magnetoelectric scheme is poor, which also limits its application. In addition, the mechanical multi-turn is composed of a gear set, and it is difficult to reduce the volume due to structural limitations. Therefore, the encoders combined with optoelectronic and magnetoelectric types are all of relatively large volume, which affects the miniaturized application of such encoders. However, mechanical multi-turn has advantages such as no need for an additional battery and less error in the number of turns information compared with electronic multi-turn and Weigand multi-turn schemes. Therefore, it is difficult to be replaced in occasions with high safety requirements. Therefore, miniaturization is imperative. Summary of the Utility Model
[0004] In order to solve the above problems, the utility model provides a small-size inductive mechanical multi-turn encoder.
[0005] The small-size inductive mechanical multi-turn encoder provided by the utility model adopts the following technical solutions:
[0006] A small-size inductive mechanical multi-turn encoder includes a rotor, the rotor includes a code disk and a rotor support, and the code disk is fixed on the code disk support; a stator, the stator includes a first PCBA, a bracket, a multi-turn component, and a second PCBA; wherein, the first PCBA is fixed at the bottom of the bracket, the second PCBA is provided with mounting holes, the second PCBA is fixed on the top of the bracket, the first PCBA and the second PCBA are electrically connected through a cable, the multi-turn component is in hole-shaft fit with the mounting holes on the second PCBA and is fixed by glue bonding, and there is an air gap between the multi-turn component and the first PCBA; the rotor is arranged below the stator, is separated from the stator, and there is an air gap between the two.
[0007] Preferably, the multi-turn component includes an n-stage reduction gear set, n magnets, and n magnetic induction chips. The magnets are located at the ends of the counting gears of the reduction gear set, and the magnetic induction chips are arranged on the first PCBA.
[0008] Preferably, the magnets are arranged directly above the magnetic induction chips.
[0009] Preferably, the reduction gear set is a small module double gear.
[0010] Preferably, n in the n-stage reduction gear set is a natural number greater than or equal to 1, and the ratio of the initial speed to the target speed after reduction of each stage of the reduction gear set is 16:1.
[0011] Preferably, the gears in the reduction gear set are axially distributed in layers.
[0012] Preferably, the gears in the reduction gear set are staggered inside and outside in the radial direction.
[0013] Preferably, it further includes a driving gear, and the driving gear is arranged on the rotor.
[0014] Preferably, an exciting coil and a receiving coil are arranged on the stator, and a multi-period sector copper foil is arranged on the rotor.
[0015] Preferably, the exciting coil and the receiving coil are parallel and directly opposite to the copper foil. Description of the Drawings
[0016] Figure 1 is a schematic exploded view of a small-size inductive mechanical multi-turn encoder according to an embodiment of the present invention.
[0017] Figure 2 is a schematic internal structure view of a small-size inductive mechanical multi-turn encoder according to an embodiment of the present invention.
[0018] Figure 3 is a schematic installation view of the multi-turn component of a small-size inductive mechanical multi-turn encoder according to an embodiment of the present invention.
[0019] Figure 4 is a schematic axial distribution view of the multi-turn component of a small-size inductive mechanical multi-turn encoder according to an embodiment of the present invention.
[0020] Figure 5 is a schematic radial distribution view of the multi-turn component of a small-size inductive mechanical multi-turn encoder according to an embodiment of the present invention.
[0021] Description of the Reference Numerals:
[0022] 1. Rotor; 2. Stator; 110. Rotor support; 120. Code disk; 130. Driving gear; 210. First PCBA; 220. Bracket; 230. Multi-turn component; 240. Second PCBA; 1201. Copper foil; 2301. Reduction gear set; 2302. Magnet; 2303. Magnetic induction chip. Detailed implementation mode
[0023] The following is further described in detail with reference to the attached Figure 1 - Attachment Figure 5 This utility model is further described in detail.
[0024] The embodiment of this utility model is disclosed. Refer to Figures 1-3 This utility model embodiment discloses a small-size inductive mechanical multi-turn encoder, which consists of two parts, namely a rotor 1 and a stator 2, and the two are separated from each other, belonging to a split structure. The stator 2 includes a first PCBA 210, a bracket 220, a multi-turn component 230 and a second PCBA 240. The multi-turn component 230 includes an n-stage reduction gear set 2301, n magnets 2302 and n magnetic induction chips 2303. The reduction gear set 2301 is in hole-shaft fit with the holes on the second PCBA 240 through a gear shaft, and is bonded and fixed with high-strength glue; a magnet 2302 is arranged at the end of the counting gear of each stage of reduction gear set, and the ratio of the initial speed to the target speed after reduction of each stage of reduction gear set 2301 is 16:1. The first PCBA 210 is bonded to the lower side of the bracket 220 with glue, the magnetic induction chip 2303 is welded to the first PCBA 210, and the magnet 2302 is arranged directly above the magnetic induction chip 2303; terminals are provided on both the first PCBA 210 and the second PCBA 240, and the two are connected and communicate with each other through a cable; the second PCBA 240 is bonded and fixed to the upper side of the bracket 220 with glue.
[0025] The rotor 1 includes a code disk 120 and a rotor support 110. The code disk 120 is bonded to the code disk support 110 with glue. Inner and outer multi-period sector copper foils 1201 are arranged on the code disk 120. Corresponding period receiving coils and exciting coils (not shown) are arranged on the first PCBA 210 of the stator 1. The copper foil 1201 is parallel and directly opposite to the receiving coil and the exciting coil, and single-turn counting is realized through the principle of electromagnetic induction. A very small air gap is reserved between the stator 1 and the rotor 2, so the requirements for axial and radial spaces are extremely low.
[0026] Refer to Figure 4 And Figure 5, the drive gear 130 is located at the center and meshes with the first-stage gear of the reduction gear set. The reduction gear set adopts a design of small module duplex gears, with the minimum module being only 0.2. In terms of layout, to minimize the radial space occupied, an axial layered distribution design is adopted among the gears, and this design allows the layout of the gears to overlap between different layers. Since terminals need to be set on the first PCBA 210 for electrical connection with the second PCBA 240, and to avoid the necessary connection holes on the PCBA, the gear set needs to leave a clearance space, and the reduction gear set 2301 needs to be staggered inside and outside in the radial direction. The magnet 2302 on the reduction gear set 2301 generates a periodically changing magnetic field as the reduction gear set 2301 rotates. The magnetic induction chip 2303 determines the position of the gear set on the circumference and thus calculates the number of turns information by detecting the direction change of this parallel magnetic field. The multi-turn component 230 includes at least 3 stages of counting gear sets. If the multi-turn component 230 includes 3 stages of reduction gear sets 2301, the maximum counting number of turns of the multi-turn encoder is 4096; if the multi-turn component 230 can also include 4 stages of reduction gear sets 2301, the maximum counting number of turns is 65536.
[0027] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited by this. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.
Claims
1. A small-sized inductive mechanical multi-turn encoder, characterized in that it includes: a rotor, the rotor includes a code disk and a rotor support, and the code disk is fixed on the code disk support; a stator, the stator includes a first PCBA, a bracket, a multi-turn component and a second PCBA; wherein, the first PCBA is fixed at the bottom of the bracket, the second PCBA is provided with mounting holes, and the second PCBA is fixed on the top of the bracket, the first PCBA and the second PCBA are electrically connected through a cable, the multi-turn component is in hole-shaft fit with the mounting holes on the second PCBA and is fixed by glue bonding, and there is an air gap between the multi-turn component and the first PCBA; the rotor is arranged below the stator, is separated from the stator, and there is an air gap between the two.
2. The small-size inductive mechanical multi-turn encoder according to claim 1, characterized in that, The multi-turn component includes an n-stage reduction gear set, n magnets and n magnetic induction chips. The magnets are arranged at the ends of the counting gears of the reduction gear set, and the magnetic induction chips are arranged on the first PCBA.
3. The small-sized inductive mechanical multi-turn encoder according to claim 2, characterized in that, The magnets are arranged directly above the magnetic induction chips.
4. A small-size inductive mechanical multi-turn encoder according to claim 2, characterized in that, The reduction gear set is a small-module double gear.
5. A small-sized inductive mechanical multi-turn encoder according to claim 2, characterized in that, The n of the n-stage reduction gear set is a natural number greater than or equal to 1, and the ratio of the initial speed to the target speed after reduction of each stage of the reduction gear set is 16:
1.
6. The small-sized inductive mechanical multi-turn encoder according to claim 2, wherein, The gears of the reduction gear set are axially stratified.
7. A small-sized inductive mechanical multi-turn encoder according to claim 2, characterized in that, The gears of the reduction gear set are staggered inside and outside in the radial direction.
8. A small-size inductive mechanical multi-turn encoder according to claim 1, characterized in that, It further includes a drive gear, and the drive gear is arranged on the rotor.
9. A small-size inductive mechanical multi-turn encoder according to claim 1, characterized in that, An excitation coil and a receiving coil are arranged on the stator, and a multi-period sector copper foil is arranged on the rotor.
10. A small-sized inductive mechanical multi-turn encoder according to claim 9, characterized in that, The excitation coil and the receiving coil are parallel and directly opposite to the copper foil.