Electricity: motive power systems – Positional servo systems – Adaptive or optimizing systems including 'bang-bang' servos
Patent
1990-02-12
1991-02-12
Roskoski, Bernard
Electricity: motive power systems
Positional servo systems
Adaptive or optimizing systems including 'bang-bang' servos
318600, 318571, 318572, 318573, 364726, 364822, G06F 314
Patent
active
049927116
ABSTRACT:
A positioning controlling device for improving the machining accuracy of a work of a non-circular shape. A control axis is driven in accordance with an input function consisting of position instruction data corresponding to a machining shape of a work, and a response function of the position of the control axis is measured actually. Then, a transfer function of the servo system is determined from Fourier transformation of the input function and Fourier transformation of the response function, and a corrected input function with which a response function of the control axis ideally corresponds to the machining shape of the work is obtained from the transfer function. Even if the control axis is driven in accordance with the corrected input function, a response function obtained does not correspond to the ideal machining shape of the work. Therefore, the calculations for obtaining an input function described above are sequentially executed until a response function obtained converges to the ideal machining shape. As a result, even if the servo system has a non-linearity, if the control axis is controlled in accordance with an input function finally obtained in this manner, then a response function then corresponds to the ideal machining shape.
REFERENCES:
patent: 4084255 (1978-04-01), Casasent et al.
patent: 4477878 (1984-10-01), Cope
patent: 4527101 (1985-07-01), Zavis et al.
patent: 4788481 (1988-11-01), Niwa
patent: 4866360 (1989-09-01), Kolomeets et al.
Hori Nobumitsu
Sakakibara Norio
Sugita Kazuhiko
Yamakawa Yoichi
Ip Paul
Roskoski Bernard
Toyoda Koki Kabushiki Kaisha
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