Electricity: motive power systems – Motor-reversing – Periodic- or intermittent-reversing
Patent
1993-10-07
1996-01-09
Martin, David S.
Electricity: motive power systems
Motor-reversing
Periodic- or intermittent-reversing
318281, 343714, 343901, 388815, 388912, H02P 122
Patent
active
054831326
ABSTRACT:
A control device for an electrically driven telescopic antenna including: a counting signal extracting circuit which detects the altered waveform of an rectified current generated during the forward or reverse rotation of a DC motor so as to extract counting signals; a command device which sends a control stop command to a motor drive control circuit when the counted value of the extracted counting signals reaches a certain preset value; a motor current monitoring circuit which monitors the current flow to the motor and outputs information on the completion of the antenna element extension/retraction action when the motor current value exceeds a prescribed value; and a correction device which corrects the counted value based upon the information outputted by the motor current monitoring circuit. The control device can include a large-capacitance capacitor for absorbing power supply fluctuations. In addition, a CPU that includes a control stop command device and counted-value correcting device can be controlled by an oscillation circuit which starts functioning when extension/retraction command signals are issued and stops such an operation when the rotational operation of the motor is completed.
REFERENCES:
patent: 4338552 (1982-07-01), Pilz et al.
patent: 4514670 (1985-04-01), Fass et al.
patent: 4730152 (1988-03-01), Foust et al.
Arata Koji
Maeda Yuji
Sato Kazufumi
Harada Kogyo Kabushiki Kaisha
Martin David S.
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