System for driving drum

Details System for driving drum System for driving drum

1986-12-11

1989-06-06

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318696, 318721, 318608, 310 67R, G05B 1940

Patent

active

048374938

ABSTRACT:
A system for driving a drum includes a pulse motor including an annular rotor fixedly mounted within the drum for rotation therewith and rotatable relative to a stator disposed within the rotor. The pitches of the rotor teeth and stator teeth are determined in such a manner that a magnetic flux linking each of the coils is changed in a sinusoidal fashion in synchronism with the rotation of the rotor. A pole position-detecting device produces a multi-phase sinusoidal pole position-detecting signal representative of the position of the magnetic poles relative to the rotor. A speed control device produces a current amplitude command signal representative of a desired torque of the rotor. A multiplier multiplies the pole-position detecting signal by the current amplitude command signal to produce a multiplication signal. A current control device is responsive to the multiplication signal to output to the coils a drive current corresponding in amplitude to the current amplitude command signal and corresponding in phase to the pole-position detecting signal, thereby energizing the coils to rotate the rotor together with the drum relative to the stator.

REFERENCES:
patent: 3509390 (1970-04-01), Loughlin et al.
patent: 4121127 (1978-10-01), Adelski et al.
patent: 4488076 (1984-12-01), MaCleod
patent: 4546299 (1985-10-01), Veale
Snowdon and Madren "Characteristics of a Synchronous Inductor Motor", Trans. AIEE, vol. 81, Part II, Mar. 1962, pp. 1-5.

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