Position detecting device and signal processing device and method thereof

Abstract

A position detection device comprises a rotor and a stator (306) which wraps the rotor inside. The rotor includes a first magnetic steel ring (302) and a second magnetic steel ring (303) which are fixed on a rotary shaft (301). The first magnetic steel ring (302) is magnetized uniformly into N pairs of magnetic poles, with polarities of adjacent two poles opposite. The total number of magnetic poles of the second magnetic steel ring (303) is N. The stator (306) is provided with m angular-distributed magnetic induction elements corresponding to the first magnetic steel ring (302) and n angular-distributed magnetic induction elements corresponding to the second magnetic steel ring (303). A signal processing device and a signal processing method are also provided.

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 and the...

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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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