Sine and cosine encoder offline detection method and system

Abstract

Disclosed is a sine and cosine encoder offline detection method and a sine and cosine encoder offline detection system. The sine and cosine encoder offline detection method includes: dividing voltages of voltage signal of a signal output end of the sine and cosine encoder, and then comparing the voltage signal after being divided voltages with a comparison voltage of a comparison module, using the comparison module to output high level if the voltage signal after being divided voltages is greater than the comparison voltage, and judging the sine and cosine encoder is normal, using the comparison module to output low level if the voltage signal after being divided voltages is less than the comparison voltage, and judging the sine and cosine encoder is offline, and thereby judging whether the signal output end of the sine and cosine encoder is offline only by comparing sizes of the voltage signal after being divided voltages of the signal output end of the sine and cosine encoder and the comparison voltage. By adopting the sine and cosine encoder offline detection method and the sine and cosine encoder offline detection system, the detection of whether the signal output end of the sine and cosine encoder is offline is simple and quick, and a complex signal processing process is not needed.

Description

technical field [0001] The invention relates to a sin-cosine encoder detection technology, in particular to a simple and fast sin-cosine encoder disconnection detection method and system. Background technique [0002] Sin-cos encoders have been widely used in various industries because of their excellent characteristics. The sine-cosine encoder provides A phase, B phase, C phase, D phase, and Z phase (each phase is composed of two signals, namely A+, A-, B+, B-, C+, C-, D+, D -) and other signals, the signal output is a sine wave signal in differential form with a peak value of 1V, where the C-phase and D-phase encoders rotate a circle to generate a sine wave signal of one cycle, and the phase difference between the two is 90°. Generally, phase C and phase D are used to determine the magnetic pole angle of the permanent magnet synchronous motor, and the magnetic pole angle of the permanent magnet synchronous motor is generally used for the decoupling vector control of the p...

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Problems solved by technology

Generally, phase C and phase D are used to determine the magnetic pole angle of the permanent magnet synchronous motor, and the magnetic pole angle of the permanent magnet synchronous motor is generally used for the decoupling vector control of the permanent magnet synchronous motor. If the encoder C+, C-, D+, D- If the signal is disconnected, it will have a bad influence on the permanent magnet synchronous motor

The existing disconnection detection is to process the C-phase and D-phase signals into pulse signals, and then judge whether the encoder is disconnected through a digital signal processor. However, when using a digital signal processor, the corresponding circuit is complicated and the software algorithm is complicated.

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