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A method of realizing high-resolution speed control based on speed encoder

A high-resolution, speed control technology, used in control systems, motor control, AC motor control, etc., can solve the problem of low voltage deviation value accuracy, and achieve the effect of wide speed control range, simple instrument structure, and precise control.

Active Publication Date: 2022-02-18
TANGSHAN COLLEGE
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  • Abstract
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Problems solved by technology

The invention has high measurement resolution, simple circuit structure, and is easy to realize, and solves the problem in the background technology that the accuracy of the voltage deviation value is not high due to ±1 pulse count error

Method used

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  • A method of realizing high-resolution speed control based on speed encoder
  • A method of realizing high-resolution speed control based on speed encoder
  • A method of realizing high-resolution speed control based on speed encoder

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Embodiment Construction

[0019] Below by embodiment the present invention will be further described

[0020] Such as image 3 Shown:

[0021] In this closed-loop control system, the computer control center outputs the frequency value corresponding to the given speed value f 1 , the frequency value corresponding to the motor speed is output by the speed measuring encoder f 2 . Under the initial action of the closed-loop control, the frequency value f 2 with step-by-step adjustment to the frequency value f 1 have the same nominal value, frequency value f 1 and f 2 There is only a small frequency difference between them, at this time the given frequency signal f 1 and the measured frequency signal f 2Periodic stable monotonous variation of the phase difference between them. The counting switch is formed by using the change characteristics of the phase difference between the two frequency signals. During the pulse counting period, the given frequency signal f 1 and the measured frequenc...

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Abstract

The invention relates to a method for realizing high-resolution rotational speed control based on a rotational speed encoder, and belongs to the technical field of rotational speed control of a speed measuring encoder. Technical solution: use the frequency signal of the given speed f 1 and the frequency signal of the tachometer encoder f 2 Accurate pulse counting is achieved by stably changing phase difference between them, which improves the accuracy of voltage integration. within a certain period of time, f 1 and f 2 The pulse numbers of m and n . Under the action of the voltage integrating switch, the m A high level is integrated to obtain a voltage U . find out f 1 and f 2 The single-cycle integrated voltage of U / m and U / n , and then get the voltage deviation value Δ U=U / m - U / n . Finally according to Δ U Find the pulse waveform of PWM, and then control the motor to reach a given speed value. The present invention utilizes the frequency signal f 1 and f 2 The characteristics of inter-phase difference changes improve the measurement resolution and overcome the counting error of ±1 pulse, thereby improving the accuracy of the integrated voltage and controlling the speed more accurately.

Description

technical field [0001] The invention relates to a method for realizing high-resolution rotational speed control based on a rotational speed encoder, which uses the pulse relationship between frequency signals corresponding to a given rotational speed and a measured rotational speed to carry out multi-period control voltage integration, and uses the integrated voltage to realize high-resolution The invention relates to resolution speed control, which belongs to the technical field of speed control by using a speed encoder. Background technique [0002] The speed encoder is often combined with PWM technology to control the speed of the motor. The speed encoder is connected to the shaft. When the motor is running, the speed encoder outputs pulses. The number of pulses in a certain period of time corresponds to the motor speed. The key to motor speed control is to accurately measure the number of pulses, and determine the deviation between the given speed value and the encoder o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/14H02P27/08H02P29/00
CPCH02P23/14H02P27/085H02P29/00
Inventor 贾兆旻马壮窦新宇向波
Owner TANGSHAN COLLEGE
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