Dual-encoding high-precision magnetic encoder and motor comprising such encoder

Abstract

The invention discloses a dual-encoding high-precision magnetic encoder and a motor comprising such encoder. The magnetic encoder comprises a first magnetic main body, a second magnetic main body, a first position sensor corresponding to the first magnetic main body, a second position sensor corresponding to the second magnetic main body and an integrated circuit board for processing output signals of the first position sensor and the second position sensor; the first magnetic main body comprises a plurality of N poles and S poles which are alternatively arranged to form a circle; the second magnetic main body comprises a pair of N pole and S pole arranged oppositely, the second magnetic main body is arranged at a center of the circle formed by the first magnetic main body and synchronously rotates with the first magnetic main body; and the number of magnetic pole pairs of the first magnetic main body is related to an A / D sampling digits of the second magnetic main body. According to the magnetic encoder provided by the invention, by arranging a center magnetic body and an excircle magnetic body, a dual-encoding structure is formed, thus, precision of the magnetic encoder is the product of sampling precision of two magnetic main bodies.

Description

technical field [0001] The invention relates to the field of encoders, in particular to a double-encoding high-precision magnetic encoder and a motor having the same. Background technique [0002] The structure of the optical encoder includes LED, photoelectric encoder, receiving device and integrated control circuit, etc., which leads to its high price, and its application has high requirements on the external environment, and cannot withstand harsh conditions such as high temperature, dust, oil pollution, and vibration. Compared with optical encoders, the advantages of magnetic encoders are obvious, but in the prior art, the accuracy of magnetic encoders is far from the accuracy of optical encoders, which is also limited in the application field of magnetic encoders. main reason. [0003] Low-precision magnetic encoders are cheap, but high-precision magnetic encoders are relatively expensive. For example, the market price of 8-bit precision magnetic encoders is around ten...

AI Technical Summary

Problems solved by technology

[0002] The optical encoder structure includes LED, photoelectric code disc, receiving device and integrated control circuit, etc., resulting in high price, and its application has high requirements on the external environment, and cannot withstand harsh conditions such as high temperature, dust, oil, vibration, etc.

Compared with optical encoders, the advantages of magnetic encoders are obvious, but in the prior art, the accuracy of magnetic encoders is far from the accuracy of optical encoders, which is also the limitation of magnetic encoders in the application field main reason

[0003] Low-precision magnetic encoders are cheap, but high-precision magnetic encoders are relatively expensive. For example, the market price of 8-bit precision magnetic encoders is around a dozen to dozens of RMB, while 16-bit precision magnetic encoders are relatively expensive. The encoder can only be purchased from well-known companies to ensure its accuracy and accuracy. The price is around a few hundred dollars, and the price of a higher-precision magnetic encoder is several times higher.

[0004] High-precision magnetic encoders in the prior art often make the magnetic body of the magnetic encoder into a precise structure, resulting in high product costs

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