Speed acquisition method based on photoelectric pulse encoder
A photoelectric pulse and encoder technology, 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 effect of fast dynamic response and short speed refresh time
Inactive Publication Date: 2015-04-29
SHANGHAI UNIV +1
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[0008] The M / T speed measurement method described above has limitations in practical applications. When measuring the motor speed, the sampling time should be increased , can improve the response speed, and at the same time reduce the speed measurement accuracy; reduce the sampling time , can improve the speed measurement accuracy and reduce the response speed at the same time, so the M / T speed measurement method is used to measure the motor speed, and there is a contradiction between the measurement accuracy and the response speed
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[0032] A preferred embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings: figure 1 It is a schematic structural diagram of the speed acquisition system based on the photoelectric pulse encoder applied in this embodiment. The system is composed of DSP controller (1), motor (2), photoelectric pulse encoder (3), FPGA controller (4), and PC (5). The DSP controller (1) is connected with the motor (2), and the DSP controller (1) controls the speed of the motor (2). The photoelectric pulse encoder (3) and the motor (2) are coaxially connected, and the photoelectric pulse encoder (3) rotates synchronously with the motor (2). The FPGA controller (4) is connected to the photoelectric pulse encoder (3). The pulse edges of signal A and signal B sent by the photoelectric pulse encoder (3) trigger the high-frequency clock pulse timer in the FPGA controller for timing. The timing time of the frequency clock pulse timer has not rea...
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The invention relates to a speed acquisition method based on a photoelectric pulse encoder. The method comprises the steps that (1) the sampling periodic time of an M / T speed measurement method is equally divided into N parts and marked as, the calculation formula (please see the formula in the specification) is provided, wherein N is the equally-divided number of the sampling periodic time in the M / T speed measurement method; (2) the equally-divided sampling periodic time is ordered in sequence and marked as ; (3) the pulse number of the photoelectric pulse encoder and the pulse number of a high frequency clock are recorded in the ordered sampling periodic time; (4) in each ordered sampling periodic time, summation is each performed on the pulse number of the photoelectric pulse encoder in the first N sampling periodic time and the pulse number of the high frequency clock in the first N sampling periodic time; (5) speed is calculated by the pulse number of the photoelectric pulse encoder in the first N sampling periodic time and the pulse number of the high frequency clock in the first N sampling periodic time. According to the speed acquisition method, not only can the speed measurement accuracy of the M / T speed measurement method be maintained, but also the dynamic response speed can be improved and the dynamic measurement error can be reduced, and the accuracy of motor speed measurement is improved.
Description
Technical field [0001] The invention relates to a speed acquisition method, in particular to a speed acquisition method based on a photoelectric pulse encoder applied to a servo system. Background technique [0002] The measurement of position and speed signals is the key technology of the servo system, and the measurement quality of the signal determines the performance of the servo system. [0003] The motor speed is obtained indirectly by detecting the number of pulses output by the photoelectric pulse encoder coaxially connected to the motor. The motor speed is calculated and the direction of the motor rotation is determined according to the detected pulse frequency and pulse sequence of the photoelectric pulse encoder. [0004] The main methods of realizing motor speed measurement are: period measurement method (T method), frequency measurement method (M method), frequency period adaptive method (M / T method). [0005] Using the T method to measure the motor speed is to calculate ...
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IPC IPC(8): G01P3/36
Inventor 王爽李伟伟黄苏融张琪李光耀朱文举
Owner SHANGHAI UNIV