Controlled positioning of a motor shaft

Details Controlled positioning of a motor shaft Controlled positioning of a motor shaft

1980-02-05

1981-04-21

Dobeck, Benjamin

Electricity: motive power systems

Positional servo systems

Adaptive or optimizing systems including 'bang-bang' servos

318616, G05B 1300

Patent

active

042635373

ABSTRACT:
A method for positioning the shaft of a motor which can be subject to a rotation force in either direction of rotation by application of drive current of a respective polarity, in order to bring the shaft to a target angular position by the action of a digital control and a position sensor associated with the motor shaft for emitting a displacement step signal in response to each movement of the the shaft through an incremental angle constituting a given fraction of one cycle of shaft rotation, which includes giving the displacement step signal the form of a signal cycle of sinus-like waveform in response to each incremental angle of shaft movement, deriving from the displacement step signal a shaft movement signal having a value represented by the sum of a component proportional to the displacement step signal and a component proportional to the time derivative thereof, and, after the motor shaft has reached a defined angular speed and at the moment when the shaft position is spaced from the target position by one-half of the incremental angle, initiating a control signal having a value which decreases with time, comparing the shaft movement signal with the control signal, and varying the polarity of motor drive current in dependence on the polarity of the comparison result.

REFERENCES:
patent: 3412300 (1968-11-01), Westenskow
patent: 3660744 (1972-05-01), Plummer
patent: 3729668 (1973-04-01), Brette
patent: 3914677 (1975-10-01), MacWade

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