Encoder with built-in magnet

Abstract

The utility model belongs to servo motor technical field discloses a kind of encoders of built-in magnet, including hall sensor group, signal processing module, including coaxial magnetic ring assembly and shell, magnetic ring assembly includes coaxial main magnetic ring and coaxial auxiliary magnetic ring;Main magnetic ring includes 64 pairs N / S pole, auxiliary magnetic ring includes 6 pairs N / S pole, and 64 absolute position detection is realized by binary encoding, main magnetic ring and auxiliary magnetic ring outside are covered with magnetic shield, shell front end is equipped with detachable flange, flange includes multiple radial bolt holes, flange is equipped with shaft sleeve interface, elastic bushing for inner diameter adjustment is equipped on the inner cavity wall of shaft sleeve interface, and shaft sleeve interface is equipped with key groove for with servo motor key adaptation, shell is made of aluminium alloy material, the rear end of shell is equipped with several cooling fins.The utility model not only can realize the simple and convenient disassembly of encoder in servo system, but also can realize the resolution of sixty-four circle value, and strong anti-interference.

Description

Technical Field

[0001] This utility model relates to the field of servo motor technology, and in particular to an encoder with a built-in magnet. Background Technology

[0002] An encoder with a built-in magnet is a sensor device that detects position or speed by integrating magnetic elements. Its working principle is that when the shaft rotates, the magnetic field generated by the built-in magnet changes periodically. The sensing element captures the difference in magnetic field strength or direction and outputs a pulse signal or absolute position code.

[0003] Current encoders commonly use external permanent magnets, where multi-turn absolute position detection typically relies on mechanical gear transmissions or complex external counters, which presents the following problems:

[0004] 1) Limited resolution: Traditional magnetic encoders have low single-turn resolution, and multi-turn detection requires mechanical gears, which are prone to wear and lead to a decrease in accuracy;

[0005] 2) Installation limitations: It requires connection via coupling or fixed bracket, making it difficult to adapt to gearboxes or motor shafts of different sizes;

[0006] 3) Poor anti-interference performance: External magnetic fields or vibrations can easily affect signal stability; therefore, we propose an encoder with a built-in magnet. Utility Model Content

[0007] In order to overcome the defects of the prior art mentioned above, the inventors conducted in-depth research and, after a great deal of creative work, completed this utility model.

[0008] Specifically, the technical problem to be solved by this utility model is to provide an encoder with a built-in magnet to solve the technical problems of limited resolution, installation limitations and poor anti-interference of current encoders.

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0010] An encoder with a built-in magnet includes a Hall sensor group and a signal processing module, and includes a coaxially arranged magnetic ring assembly and a housing. The magnetic ring assembly includes a coaxially arranged main magnetic ring and a coaxially arranged auxiliary magnetic ring.

[0011] The main magnetic ring includes 64 pairs of N / S poles, and the auxiliary magnetic ring includes 6 pairs of N / S poles, and absolute position detection of 64 turns is achieved through binary encoding.

[0012] As an improved technical solution, the main magnetic ring and the auxiliary magnetic ring are covered with a magnetic shielding cover.

[0013] As an improved technical solution, the front end of the housing is provided with a detachable flange, the flange includes multiple radial bolt holes, and the flange is provided with a bushing interface.

[0014] As an improved technical solution, the inner wall of the bushing interface is provided with an elastic bushing for adjusting the inner diameter, and the bushing interface is provided with a keyway for adapting to the servo motor key.

[0015] As an improved technical solution, the outer shell is made of aluminum alloy material, and the rear end of the outer shell is provided with a number of heat dissipation fins, and the number of heat dissipation fins are equidistantly arranged along the axial / circumferential direction of the outer shell.

[0016] As an improved technical solution, it can be installed on the side wall of the gearbox or the output shaft end of the motor, and the output resolution is 17 bits.

[0017] After adopting the above technical solution, the beneficial effects of this utility model are:

[0018] 1. This utility model, by setting a main magnetic ring and an auxiliary magnetic ring mounted coaxially, enables the magnetic pole encoding to achieve multi-turn absolute position detection and a resolution of sixty-four turns, without the need for mechanical gears.

[0019] 2. This utility model, by setting a flange and bushing interface that can be quickly switched, is compatible with fixed installation of gearbox or direct connection of motor shaft.

[0020] 3. This utility model, by covering the outside of the main magnetic ring and the auxiliary magnetic ring with a magnetic shield, can reduce the influence of external magnetic fields and vibrations, thereby improving anti-interference performance.

[0021] 4. This utility model, by setting up a built-in magnetic ring assembly and a detachable installation design, not only enables easy disassembly and assembly of the encoder in the servo system, but also allows for selection of the required installation position according to different scenarios to meet customer needs. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0024] Figure 2 This is a schematic diagram of the main structure of the flange separation of this utility model.

[0025] Figure 3 For the present utility model Figure 2 Enlarged structural diagram at point A in the middle.

[0026] Figure 4 This is a side view schematic diagram of the flange separation structure of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] In the diagram: 1. Main magnetic ring; 2. Auxiliary magnetic ring; 3. Housing; 31. Flange; 311. Bushing interface; 3111. Elastic bushing; 3112. Keyway; 32. Heat dissipation fins; 4. Magnetic shielding cover. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0032] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0033] Reference Figures 1-4An encoder with a built-in magnet is provided. This encoder includes a Hall sensor group, a signal processing module, a coaxially arranged magnetic ring assembly, and a housing 3. The magnetic ring assembly includes a coaxially arranged main magnetic ring 1 and a coaxially arranged auxiliary magnetic ring 2. The Hall sensor group includes two sets of orthogonally arranged main sensors and a single set of auxiliary sensors, corresponding to the main magnetic ring 1 and the auxiliary magnetic ring 2, respectively. The signal processing module includes an analog-to-digital conversion unit and a logic processing unit. The logic processing unit calculates the absolute position by combining the pulse count of the main magnetic ring 1 and the binary code of the auxiliary magnetic ring 2. The signal processing module integrates an MCU to convert the magnetic signal into a digital position value and output it through RS485 / CAN.

[0034] The main magnetic ring 1 includes 64 pairs of N / S poles, and the auxiliary magnetic ring 2 includes 6 pairs of N / S poles. The absolute position detection of 64 turns is achieved through binary encoding. In the application, the main magnetic ring 1 and the auxiliary magnetic ring 2 are set to be mounted coaxially. Their magnetic pole encoding can achieve multi-turn absolute position detection and a resolution of 64 turns, without the need for mechanical gears.

[0035] Reference Figure 2 and Figure 3 The main magnetic ring 1 and the auxiliary magnetic ring 2 are covered with a magnetic shield 4 to reduce the influence of external magnetic fields and vibrations, thereby improving anti-interference.

[0036] Reference Figure 2 and Figure 4 The front end of the housing 3 is provided with a detachable flange 31, which includes multiple radial bolt holes and a bushing interface 311.

[0037] Reference Figure 2 and Figure 4 The inner wall of the bushing interface 311 is provided with an elastic bushing 3111 for adjusting the inner diameter, and the bushing interface 311 is provided with a keyway 3112 for matching with the servo motor key.

[0038] Reference Figure 1 , Figure 2 as well as Figure 4 The outer casing 3 is made of aluminum alloy. The rear end of the outer casing 3 is provided with several heat dissipation fins 32, and the heat dissipation fins 32 are equidistantly arranged along the axial / circumferential direction of the outer casing 3. In application, the aluminum alloy outer casing 3 can reduce the influence of external magnetic fields and vibrations to improve signal stability.

[0039] Reference Figures 1-4 It can be installed on the side wall of the gearbox or the output shaft of the motor, and the output resolution is 17 bits. In application, the single-turn 14 bits plus the multi-turn 3 bits (64 turns) bring the total resolution to 17 bits to meet the needs of precision control.

[0040] This invention provides an encoder with a built-in magnet. By setting a built-in magnetic ring assembly and a detachable installation design, it not only enables easy disassembly and assembly of the encoder in the servo system, but also allows for selection of the required installation position according to different scenarios to meet customer needs.

[0041] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. An encoder with a built-in magnet, comprising a Hall sensor array and a signal processing module, characterized in that: It includes a magnetic ring assembly and a housing (3) arranged coaxially, wherein the magnetic ring assembly includes a main magnetic ring (1) arranged coaxially and an auxiliary magnetic ring (2) arranged coaxially; The main magnetic ring (1) includes 64 pairs of N / S poles, and the auxiliary magnetic ring (2) includes 6 pairs of N / S poles. The absolute position detection of 64 rings is achieved through binary encoding.

2. The encoder with a built-in magnet according to claim 1, characterized in that: The main magnetic ring (1) and the auxiliary magnetic ring (2) are covered with a magnetic shield (4).

3. The encoder with a built-in magnet according to claim 1, characterized in that: The front end of the housing (3) is provided with a detachable flange (31), the flange (31) includes a plurality of radial bolt holes, and the flange (31) is provided with a bushing interface (311).

4. The encoder with a built-in magnet according to claim 3, characterized in that: The inner wall of the bushing interface (311) is provided with an elastic bushing (3111) for adjusting the inner diameter, and the bushing interface (311) is provided with a keyway (3112) for adapting to the servo motor key.

5. The encoder with a built-in magnet according to claim 1, characterized in that: The outer shell (3) is made of aluminum alloy. The rear end of the outer shell (3) is provided with a plurality of heat dissipation fins (32), and the plurality of heat dissipation fins (32) are equidistantly arranged along the axial / circumferential direction of the outer shell (3).

6. The encoder with a built-in magnet according to any one of claims 1-5, characterized in that: It can be installed on the side wall of the gearbox or the output shaft of the motor, and the output resolution is 17 bits.

Images