阅读说明：本技术 一种磁编码器的隔磁装置 (Magnetic isolation device of magnetic encoder ) 是由 赵鹏 陈文君 高宏伟 于 2019-04-18 设计创作，主要内容包括：本发明涉及一种磁编码器的隔磁装置,该装置安装在磁编码器本体和电机本体之间,所述的磁编码器本体与电机本体连接,所述的隔磁装置包括隔磁结构,所述的隔磁结构安装在电机本体的后端盖(4)上,所述的磁编码器本体位于隔磁结构内；所述的隔磁结构将编码器本体和电机本体进行隔离,隔绝来自电机本体的磁场干扰。与现有技术相比,本发明具有隔磁效果好,制造成本低,结构简单,安装方便等优点。(The invention relates to a magnetic isolation device of a magnetic encoder, which is arranged between a magnetic encoder body and a motor body, wherein the magnetic encoder body is connected with the motor body and comprises a magnetic isolation structure, the magnetic isolation structure is arranged on a rear end cover (4) of the motor body, and the magnetic encoder body is positioned in the magnetic isolation structure; the magnetic isolation structure isolates the encoder body from the motor body and isolates magnetic field interference from the motor body. Compared with the prior art, the magnetic shield has the advantages of good magnetic shield effect, low manufacturing cost, simple structure, convenience in installation and the like.)

1. The utility model provides a magnetic encoder's magnetism device that separates, the device install between magnetic encoder body and motor body, the magnetic encoder body be connected with motor body, its characterized in that, the magnetism device that separates include and separate the magnetism structure, separate the magnetism structure and install on motor body's rear end cap (4), the magnetic encoder body be located and separate the magnetism structure.

2. A magnetic shield for a magnetic encoder as claimed in claim 1, wherein said magnetic shield is fixedly attached to the rear end cap (4) of the motor body by means of screws (3).

3. The magnetism isolating device of a magnetic encoder according to claim 2, wherein the magnetism isolating structure comprises a magnetism isolating plate (1) and a protective cover (2), and the screw (3) passes through the protective cover (2) and the magnetism isolating plate (1) in sequence and then is fixedly connected with the rear end cover (4).

4. A magnetic shielding device of a magnetic encoder as claimed in claim 3, wherein the encoder body is located in a shielding space formed between the magnetic shielding plate (1) and the shield (2) for isolating the interference of external magnetic field.

5. A magnetic shield for a magnetic encoder according to claim 3, wherein at least one screw (3) is provided.

6. A magnetic shielding device of a magnetic encoder as claimed in claim 3, characterized in that the shielding cover (2) in the magnetic shielding structure is a fully enclosed shielding cover, a perforated or a grid shielding cover.

7. A magnetic shield for a magnetic encoder according to claim 3, wherein the magnetic shield (1) and the shield (2) are made of soft magnetic material.

Technical Field

The invention relates to the technical field of magnetic encoders, in particular to a magnetic isolation device of a magnetic encoder.

Background

External magnetic fields, such as rotor magnetic steel, a brake at the rear end of the motor, a strong magnetic environment and the like, interfere with the magnetic encoder, and can cause the failure of motor control in severe cases. In the past, the magnetic encoder is directly arranged at the tail end of the motor, magnetic shielding is not carried out, and an external magnetic field interferes with the encoder. One of the existing solutions is to increase the length of the rear shaft of the motor by design to ensure that the magnetic field strength of the rotor is small enough on the encoder side, but this approach increases the overall length of the motor. The second solution is to reduce the distance between the magnetic encoder magnetic steel and the magnetic sensor chip to increase the sampling of the effective signal, but this requires a more demanding mounting process.

The two existing solutions raise the manufacturing cost of the motor and do not provide effective magnetic isolation for the magnetic encoder.

Disclosure of Invention

The present invention is directed to a magnetic shielding apparatus for a magnetic encoder, which overcomes the above-mentioned drawbacks of the prior art.

The purpose of the invention can be realized by the following technical scheme:

a magnetic isolation device of a magnetic encoder is arranged between a magnetic encoder body and a motor body, the magnetic encoder body is connected with the motor body, the magnetic isolation device comprises a magnetic isolation structure, the magnetic isolation structure is arranged on a rear end cover of the motor body, and the magnetic encoder body is positioned in the magnetic isolation structure;

the magnetic isolation structure isolates the encoder body from the motor body and isolates magnetic field interference from the motor body.

Preferably, the magnetic isolation structure is fixedly connected to the rear end cover of the motor body through screws.

Preferably, the magnetism isolating structure comprises a magnetism isolating plate and a protective cover, and the screw penetrates through the protective cover and the magnetism isolating plate in sequence and then is fixedly connected with the rear end cover.

Preferably, the encoder body is located in a shielding space formed between the magnetic shield and the protective cover, and is used for isolating interference of an external magnetic field.

Preferably, at least one screw is provided.

Preferably, the protective cover in the magnetic isolation structure is a fully-closed protective cover, a protective cover with holes or a protective cover with grids.

Preferably, the magnetic isolation plate and the protective cover are both made of soft magnetic materials.

Compared with the prior art, the invention has the following advantages:

firstly, the magnetic isolation effect is good: the magnetism isolating plate and the protective cover are made of soft magnetic materials, the magnetic conductivity is high, the external magnetic field can be guided to form a loop at the magnetism isolating plate and the protective cover, a magnetic shielding space is formed inside the magnetic isolating plate and the protective cover, the external magnetic field is isolated, the magnetic encoder is protected from being interfered, and the magnetism isolating effect is better than that of the prior art.

Secondly, the manufacturing cost is low: the purpose can be achieved by using the magnetism isolating plate and the protective cover, the length of a rear output shaft of the motor does not need to be increased or the distance between the encoder magnetic steel and the magnetic induction chip does not need to be reduced, and the manufacturing cost is lower.

Thirdly, the installation is convenient: the magnetic isolation plate and the protective cover can be fixed on the rear end cover of the magnetic encoder by one or more screws, and the magnetic encoder is simple in structure and convenient to install.

Drawings

FIG. 1 is a schematic structural view of the present invention

FIG. 2 is a schematic sectional view of the motor

As indicated by the reference numbers in fig. 1:

1. the magnetic shield comprises a magnetic shield plate 2, a protective cover 3, a screw 4 and a rear end cover.

As indicated by the reference numbers in fig. 2:

1. the magnetic isolation plate comprises a magnetic isolation plate 2 and a protective cover, wherein the magnetic isolation plate 5 is a PCB support, the PCB 6 is a PCB, the magnetic steel 7 is magnetic steel, and the magnetic steel 8 is a magnetic steel sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.