Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1988-05-09
1989-05-16
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, H02P 800
Patent
active
048313203
ABSTRACT:
A duty factor control method for electromechanical actuators which can take only mutually discrete positions. A required quantity of state R which is in intermediate condition between two discrete positions is given for every upper-level control cycle Tr. According to the R value, the durations Ta and Tb of first and second states (such as ON and OF positions) of the actuator are determined. In order to obtain the required R smoothly and quickly, the sum Tc=Ta+Tb has to be set as small as possible. But the Ta and Tb values have to be larger than their minimum values Tam and Tbm which are determined by the dynamic characteristics of the actuator. Thus, the Ta and Tb values are determined so that either Ta or Tb will be set at its minimum value Tam or Tbm while the other will take a value corresponding to R. Ta, Tb, Tam and Tbm are set as multiples of a unit cycle To so that the duration of state will be measured digitally for every unit cycle To by a counter. When it is judged that the duration of state has reached the preset value Ta or Tb, the state is changed over from one to the other. When the R value and thus Ta and Tb are renewed at the end of every cycle Tr, the state at the end of cycle Tr is maintained until its duration exceeds a renewed Ta and Tb value. Also, if necessary, either Ta or Tb may be set at zero so that one state will persist for the entire cycle Tr.
REFERENCES:
patent: 4608958 (1986-09-01), Sakakibara et al.
patent: 4651838 (1987-03-01), Hamilton et al.
Bergmann Saul M.
Shoop Jr. William M.
Sumitomo Electric Industries Ltd.
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