Stepping motor control having a dynamically variable loop filter

Details Stepping motor control having a dynamically variable loop filter Stepping motor control having a dynamically variable loop filter

1990-04-02

1991-03-05

Britton, Howard W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 98, H04N 904

Patent

active

049981633

ABSTRACT:
Apparatus for controlling a stepping motor drive system during start up and maintenance of a desired oeprating speed. A dynamically variable loop filter i.e. a boot strap loop filter is used in a phase locked loop circuit to ramp the stepping motor to operative speed faster and with less transient instability than heretofore available. Protection from transients tending to cause slower or faster speeds is obtained with the same circuits. Stall sensing and restart capabilities are provided and the circuits use fewer components and less PCB real estate than prior art.

REFERENCES:
patent: 4074306 (1978-02-01), Kakinuma et al.
patent: 4523224 (1985-06-01), Longacre, Jr.
patent: 4546379 (1985-10-01), Sarofeen et al.
patent: 4631582 (1986-12-01), Nagasaki et al.
patent: 4924166 (1990-05-01), Roussel

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