Recorders – Record receivers and/or driving means therefor – Drum
Patent
1986-05-09
1988-04-19
Goldberg, E. A.
Recorders
Record receivers and/or driving means therefor
Drum
318696, 310 49R, G01D 1524, H02P 800
Patent
active
047393467
ABSTRACT:
For requirements where constant velocity is important and positional error must be small and non-cumulative, a bipolar or unipolar, two-phase, permanent magnet stepper motor is driven by sawtooth currents in such manner as to produce a rotating magnetic field that exerts a substantially constant torque on the rotor. When using a bipolar stepper motor with windings electrically offset by 90.degree., two drive currents are generated that increase and decrease in amplitude linearly between predetermined maximum and minimum values. With a unipolar motor, four sawtooth waveforms, of single polarity, are provided. In either case, the currents are displaced by 90.degree. to produce a rotating magnetic field of uniform amplitude.
A microprocessor controls the generation of a number of voltage ramps that control current generators for either the bipolar or unipolar stepper motor.
To control speed and torque, the slope of the current ramp and the repetition rate are varied until the motor has attained a steady operating state. The amplitude of the driving currents is determined indirectly by controlling the rate of the current increase of the ramp and the time before current directions of the phases are indexed.
REFERENCES:
patent: 4275339 (1981-06-01), Burke et al.
patent: 4496831 (1983-01-01), Swartz et al.
patent: 4620198 (1986-10-01), Behun
Beling, T. E., "Permanent Magnet Step Motors", Theory and Applications of Step Motors, West Publishing Co: New York, 1944, pp. 206-251.
Advanced Color Technology, Inc.
Barrett E. T.
Goldberg E. A.
Reinhart Mark
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