Controller for a stepping motor

Details Controller for a stepping motor Controller for a stepping motor

1998-09-14

1999-10-05

Ro, Bentsu

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318705, 318714, H02P 838, B41J 2938

Patent

active

059630051

ABSTRACT:
The present invention provides a controller with a function of detecting status to be losing synchronism for a stepping motor driven by constant-current system. A current controller 404 applies the driving-current to a stepping motor 401 in accordance with the command derived from a control unit 407. The applied current is observed by a current measuring unit 403, and stored in a current observing unit 409 in response to the sampling signals generated from a sampling signal generating unit 408. After an excitation has completed, the observing waveform is compared with a predetermined reference waveform in the control unit, and it is determined that a loss of synchronism occurs in the stepping motor when these do not agree within a predetermined tolerance.

REFERENCES:
patent: 3577176 (1971-05-01), Kreithen et al.
patent: 3601678 (1971-08-01), Abraham et al.
patent: 4215302 (1980-07-01), Chiang
patent: 4642543 (1987-02-01), MacMinn
patent: 4658194 (1987-04-01), Richter et al.
patent: 4831319 (1989-05-01), Heinrich et al.

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