T-method motor speed measurement method of four-way parallel sampling

A technology of motor measurement and speed measurement, which is applied in the direction of devices using optical methods, can solve the problems of reducing the accuracy of speed measurement, and achieve the effects of high dynamic response speed, low dynamic speed measurement error, and high speed measurement accuracy

Inactive Publication Date: 2016-07-06
上海新源工业控制技术有限公司 +1
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Problems solved by technology

Due to the manufacturing process, the A phase and B phase output by the incremental photoelectric encoder are not orthogonal to each other, which makes the output square wave s

Method used

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  • T-method motor speed measurement method of four-way parallel sampling
  • T-method motor speed measurement method of four-way parallel sampling
  • T-method motor speed measurement method of four-way parallel sampling

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with accompanying drawing, and the structure and principle of this device are very clear to those skilled in the art. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0027] The present invention is a four-way parallel sampling T method motor speed measurement method, the speed measurement method is as follows: figure 2 shown, and the specific description is as follows:

[0028] 1) The incremental photoelectric encoder outputs square wave signals of phase A and phase B to input the signal processing controller, and the trigger signals of the four timers are set as: rising edge of phase A, falling edge of phase A, rising edge of phase B , Phase B falling edge;

[0029] 2) When step 1) ends and when there is a trigger signal, the timer begins to count the period as T high-frequency clock pulse sig...

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Abstract

The invention relates to the technical field of motor speed measurement by a four-way parallel sampling T-method motor speed measurement method, and specifically relates to a method for obtaining the rotational speed of an incremental photoelectric encoder applied to a servo system at low speed operation. First, the incremental photoelectric encoder Output the square wave signals of phase A and phase B to the signal processing controller, set the trigger signals of the four timers as: rising edge of phase A, falling edge of phase A, rising edge of phase B, falling edge of phase B, and then timing The timer starts counting the high-frequency clock pulse signal with a cycle of T, when the timer encounters the same A and B phase change edges again, it records the number of high-frequency clock pulse signals, and at the same time clears the counter and starts the next count cycle, and then calculate the motor speed according to the number M of high-frequency clock pulse signals, and update the speed every time the timer finishes counting the high-frequency clock pulse signals, thus completing the speed measurement of the motor. The speed measuring method of the invention has high speed measuring precision when measuring the low speed of the motor, low dynamic speed measuring error and high dynamic response speed.

Description

[technical field] [0001] The invention relates to the technical field of motor speed measurement, in particular to a method for acquiring the rotational speed of an incremental photoelectric encoder applied to a servo system during low-speed operation. [Background technique] [0002] The performance of the servo motor running at low speed is one of the performance indicators of the servo drive. The accuracy and rapidity of the speed feedback data at low speed operation affect the control performance of the servo system. [0003] The motor speed is indirectly obtained by detecting the output pulse number of the incremental photoelectric encoder coaxially connected with the motor. According to the detected incremental photoelectric encoder pulse frequency and pulse timing, the motor speed is calculated and the motor rotation is judged. direction. [0004] The methods of motor speed measurement mainly include: measuring cycle method (T method), measuring frequency method (M me...

Claims

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Application Information

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IPC IPC(8): G01P3/36
CPCG01P3/36
Inventor 王爽孙承波付俊永冯坚栋
Owner 上海新源工业控制技术有限公司
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