Sine and cosine encoder, signal processing method thereof and elevator control system

Abstract

The invention relates to a sine and cosine encoder, a signal processing method of the sine and cosine encoder and an elevator control system, the sine and cosine encoder comprises a luminous source, a grating, a photoelectric sensor and an error compensation circuit, the error compensation circuit comprises a voltage value determination module and a proportional-integral controller, the input end of the voltage value determination module is electrically connected with the output end of the photoelectric sensor, and the voltage value determination module is used for determining sine and cosine voltage values output by the photoelectric sensor; the first input end of the proportional-integral controller is electrically connected with the output end of the voltage value determination module, reference voltage is applied to the second input end of the proportional-integral controller, and the proportional-integral controller is used for performing proportional adjustment and integral adjustment on the deviation between the reference voltage and the sine and cosine voltage values and generating a compensation voltage value; and the proportional-integral controller also outputs the compensation voltage value to the input end of the luminous source.

Description

technical field [0001] The present application relates to the field of sine-cosine encoders, in particular to a sine-cosine encoder, a signal processing method thereof, and an elevator control system. Background technique [0002] As a precision sensor for position feedback, sine-cosine encoders are widely used in equipment that requires high speed and position control, such as servo drive systems and elevator systems. In the elevator system, the rotor of the sine-cosine encoder can rotate with the rotor of the traction machine to generate a sine-cosine voltage signal that can accurately reflect the position and speed of the motor. Therefore, the sine-cosine voltage signal is the key to the stability of the elevator system. One of the key information for operation. [0003] The following problems may exist in the sine-cosine encoder in the related art: [0004] 1) There are dynamic changes in the amplitude of the sinusoidal voltage at the output terminal of the photoelectr...

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Problems solved by technology

[0004] 1) There are dynamic changes in the amplitude of the sinusoidal voltage at the output terminal of the photoelectric sensor, which may exceed or be lower than the standard requirements, and cannot be adjusted;

[0005] 2) With the prolongation of the use time of the light source, as well as the influence of ambient temperature and dust, there will be a problem of attenuation of the intensity of the light source. After receiving, calibrating, and calculating the photoelectric sensor, the sine and cosine voltage signals will also be partially attenuated;

[0006] 3) The deviation of the power supply voltage of the hardware circuit or other disturbances lead to unstable changes in the sinusoidal voltage signal

[0007] The above problems will directly or indirectly affect the quality of the encoder sine and cosine voltage signals, thereby affecting the accuracy, comfort and safety of the drive system, elevator system, etc.

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