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Digital converter of magnetic encoder

A technology of digital converters and magnetic encoders, applied in the direction of reducing unwanted effects, can solve the problems of phase lag and low precision, and achieve the effect of strong anti-interference ability and high demodulation precision

Inactive Publication Date: 2012-05-30
BEIHANG UNIV
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AI Technical Summary

Problems solved by technology

The accuracy of this scheme is not high, and there is a phase lag

Method used

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  • Digital converter of magnetic encoder
  • Digital converter of magnetic encoder
  • Digital converter of magnetic encoder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0067] In order to compare the accuracy of the present invention and the traditional demodulation method, a semi-physical simulation experiment is carried out. Select a TMS320 series DSP processor chip with DA output as the two-way sine and cosine signals output by the magnetic encoder simulator. The processing chip adopts another TMS320 series DSP processor chip.

[0068] Assuming that the motor rotor is running at a speed of ω=12.6+8sin(6.28t)rad / s, the set running time is 30s, and the measurement time t is 20s. The angle observer constant K θ is 500; the angular velocity observer constant K ω for 62500. The sampling period T is 1ms. During system initialization, the estimated value of angular velocity at the zeroth measurement moment recorded in the D state memory 69 is 0; the estimated value of the angle at the zeroth measurement moment recorded in the E state memory 611 is 0. When each data information is collected on the processor, the maximum error value of the...

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PUM

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Abstract

The invention discloses a digital converter of a magnetic encoder, comprising a magnetic encoder, a signal processor, a phase-sensitive detector, a feedforward signal generator and a state observer. The signal processor caries out amplitude conditioning and analog-to-digital conversion to the output signal of the magnetic encoder; the phase-sensitive detector can generate an error signal containing phase information according to the output signal of the magnetic encoder and an angle estimation value output by the state observer; the feedforward signal generator calculates a feedforward angular velocity value needed by the state observer according to the output signal of the signal processor; and the state observer demodulates the angle and the angular velocity of a tested rotating device according to the error signal and the feedforward angular velocity value. The invention can greatly reduce the phase lag of the demodulated signal when the rotating device continuously rotates and hashigh demodulation accuracy and strong anti-interference capability.

Description

technical field [0001] The invention relates to a magnetic encoder digital converter, more precisely, it refers to a magnetic encoder (position sensor) digital converter that can demodulate the output signal of the magnetic encoder and can be applied in the servo control system. converter. Background technique [0002] Magnetic encoders consist of linear Hall or magnetoresistive elements and are sensors used to measure the angle of rotation. Because of its simple structure, small size, low cost, strong anti-interference ability and environmental adaptability, it plays a very important role in rotor position detection. [0003] At present, there are many demodulation schemes for the magnetic encoder digital converter, and the most widely used ones are the arctangent operation scheme and the angle tracking transformation scheme. The arctangent operation scheme first obtains the angle information through the arctangent operation, and then obtains the angular velocity informat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D3/028
Inventor 吴忠吕绪明吴云涛傅安琪
Owner BEIHANG UNIV
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