Position detecting device and signal processing device and method thereof

Abstract

The invention discloses a position detecting device and a signal processing device and method thereof. The position detecting device comprises a rotor and a stator covering the rotor inside, wherein the rotor comprises a first magnetic steel ring and a second magnetic steel ring which are fixed on a rotation axis; the first magnetic steel ring is uniformly magnetized into N (<=2n) pairs of magnetic poles and the adjacent two poles have opposite polarity; the total number of the magnetic poles of the second magnetic steel ring is N and the magnetic order is determined according to the specificmagnetic order algorithm; and m-numbered magnetic induction elements which are distributed at a certain angle and correspond to the first magnetic steel ring are arranged on the same circumference with the center of the first magnetic steel ring as the circle center on the stator, and n-numbered magnetic induction elements which are distributed at a certain angle and correspond to the second magnetic steel ring are arranged on the same circumference with the center of the second magnetic steel ring as the circle center on the stator. The device and the method of the invention can simplify theproduction process, improve the measuring precision, lower the production cost and improve the cost performance.

Description

technical field [0001] The invention relates to a position detection device and its signal processing device and method, in particular to a position detection device for precise position control of a motor and its signal processing device and method. Background technique [0002] The position detection device used in the field of motor control is mainly an encoder. The encoder is a position sensor that converts physical quantities such as the rotational angular position and angular velocity of the motor into electrical signals. The manufacture and signal processing level of the encoder directly affect level of automation. [0003] At present, photoelectric encoders are mainly used in the field of engineering technology, and there are two types: incremental and absolute. When the shaft of the incremental encoder rotates, it drives the grating disk to rotate. The light emitted by the light-emitting element is cut into intermittent light by the slit of the grating disk, indica...

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Problems solved by technology

[0005] However, there are some insurmountable shortcomings in the photoelectric encoder: the photoelectric encoder is made of glass material through the engraved line, its anti-vibration and impact ability is not strong, it is not suitable for harsh environments such as dust and condensation, and its structure and positioning Complicated assembly; there is a limit to the distance between the engraved lines, and the code wheel must be enlarged to improve the resolution, making it difficult to miniaturize; high assembly accuracy must be ensured in production, which directly affects production efficiency and ultimately affects product cost

[0015] A-phase analog signal v obtained from the magnetic induction element a and B-phase analog signal v b , generally contain high-order harmonics and noise. Using the above-mentioned method of finding the arctangent value will be affected by high-order harmonics. If the influence of high-order harmonics cannot be reduced or eliminated, it is difficult to obtain an accurate position signal. θ;

[0016] Analog devices cause temperature drift and zero point drift, which reduces the reliability and stability of the circuit; the product cost of analog circuits is higher

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