Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1981-04-10
1984-01-17
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318696, 318138, G05B 1940
Patent
active
044266081
ABSTRACT:
A stepping motor control system which uses a closed-loop lead angle control technique wherein a programmably selected lead angle signal is combined with a signal representing the position of a step motor shaft so as to provide a coil state excitation signal for the coils of the stepping motor, the shaft thereof being rotated in response to the coil state excitation signal. The lead angle signal can be modulated in accordance with a selected duty cycle so as to assume two adjacent lead angle values during each modulation cycle. The system can also be arranged to permit the use of open-loop control using a suitably programmed externally supplied coil state excitation signal, the latter being capable of similar modulation as described above with reference to lead angle modulation.
REFERENCES:
patent: 3863118 (1975-01-01), Lander et al.
patent: 3968416 (1976-07-01), Leenhouts
patent: 4145644 (1979-03-01), Liu
patent: 4158800 (1979-06-01), Jahelks et al.
"Digital Methods Fixes Phase Log or Lead", D. W. Kennedy, Control Engineering, Aug. 1967, pp. 72-73.
"Closed-Loop Control of Step Motors", B. C. Kuo, p. 252 and Approaches to Step Motor Controls, J. R. Pawletks in Theory and Applications of Step Motors, B. C. Kuo, Editor, West Publishing Co., 1974.
Larson Noble G.
Mason Matthew T.
Purbrick John A.
Bergmann Saul M.
Dobeck B.
Massachusetts Institute of Technology
O'Connell Robert F.
Smith, Jr. Arthur A.
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