A Method of Realizing High Resolution Velocity Measurement Based on Encoder
A high-resolution, encoder technology, applied to devices using electric/magnetic methods, etc., to achieve the effects of eliminating counting errors, high-resolution measurement, and improving technical indicators
Active Publication Date: 2017-11-17
贾兆旻
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[0003] The purpose of the present invention is to provide a method for realizing high-resolution speed measurement based on an encoder, which uses the characteristics of the phase relationship between periodic signals to open and close the actual counting gate by detecting the characteristic point where the phase difference between the two signals is zero, so as to This overcomes the counting error of ±1 word, greatly eliminates the counting error of ±1 word that usually exists widely, improves the measurement resolution, the measurement circuit structure is simple, the accuracy is high, the additional noise is small, and it is easy to implement, solving the background The above-mentioned problems in the technology
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[0030] Below by embodiment the present invention will be further described
[0031] Such as figure 1 Shown:
[0032] Output the measured signal at the encoder and synthesized signal via MCU (Micro Control Unit) control In the two or several time intervals between which the phase difference is zero, several periods of the two frequency signals are respectively accommodated, and they are quite close to the integer multiple period value;
[0033] The actual gate signal is generated by using the feature point with zero phase difference of the two periodic signals and the reference gate signal, and the start time and end time of the gate time strictly correspond to the feature point with zero phase difference; test signal and composite signal fairly close to synchronization;
[0034] The actual gate is opened at the first characteristic point pulse with zero phase difference after the rising edge of the reference gate, and the actual gate is closed at the first zero phase...
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The invention relates to a method for achieving high-resolution velocity measurement based on an encoder and belongs to the field of encoder velocity measurement technology. According to the technical scheme, accurate measurement is achieved through phase relation between a frequency signal f1 output by the encoder and a synthesized frequency signal f2. Actual gate signals are generated by utilizing phase feature points of two periodic signals and reference gate time signals, and the starting moment and the stopping moment of gate time are synchronized with two frequency signals. After an actual gate is started, a counter counts the two signals respectively, so that a frequency value (f1 = ) of a velocity measurement signal is obtained, and finally a revolving speed value n is obtained through relational operation between frequency and speed. Through the method, usually and widely existing counting errors larger / smaller by one character are eliminated, the resolution ratio on revolving speed measurement is improved, and high-resolution measurement of the revolving speed in a wide range is achieved.
Description
technical field [0001] The invention relates to a method for realizing high-resolution speed measurement based on an encoder, which utilizes the phase relationship between periodic signals to realize high-resolution speed measurement, and belongs to the technical field of encoder speed measurement. Background technique [0002] The encoder is connected to the shaft. When the shaft rotates, the encoder will output pulses. The counter receives the pulses. According to the speed of the shaft rotation, the total amount of pulses received in a unit time is different, and the speed value can be calculated. . The key to speed measurement is to measure the precise number of pulses. Background Art There are two commonly used methods for speed measurement using an encoder: one is the M method, and the other is the T method. The M method is to measure the number of pulses of the measured signal within a given gate time, and obtain the frequency of the measured signal through conversio...
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IPC IPC(8): G01P3/44
Inventor 贾兆旻周渭
Owner 贾兆旻