Closed loop single step response by open winding voltage feedbac

Details Closed loop single step response by open winding voltage feedbac Closed loop single step response by open winding voltage feedbac

1990-10-09

1993-07-13

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, G05B 1940

Patent

active

052277097

ABSTRACT:
A closed-loop voltage feedback system and method for control of the step response of a multiple-phase step motor, wherein the rotor oscillation amplitude is smaller than the period of the back emf voltage waveform, achieving minimization of the step response ringout time. Thus, when used in computer memory disc drives, the present invention provides faster data acquisition by reducing settling time and seek time. The claimed method includes steps for sampling the back emf voltage induced across an open phase winding, producing a continuous feedback signal proportional to the velocity of the step motor, and applying the continuous feedback signal to an energized phase winding to produce damping. The method may also be used in conjunction with open or closed loop position feedback for microstepping the motor to nondetent positions. The present invention eliminates the need for external sensors or an extensive amount of electronics.

REFERENCES:
patent: 3727121 (1973-04-01), Rich
patent: 4258622 (1981-03-01), Estrabaud et al.
patent: 4510429 (1985-04-01), Squire
patent: 4709199 (1987-11-01), Wang et al.
Ninth Annual symposium on incremental motion, Proceedings pp. 115-124, Kenjo et al 1980.
IBM Technical Disclosure vol. 18, No. 12 May 1976 p. 4123, Lopour et al.

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