Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1995-01-24
1996-11-19
Martin, David S.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388906, 3889075, 318438, 318246, H02P 517
Patent
active
055771530
ABSTRACT:
A control circuit for a series type dc motor. The control circuit uses a switching cell to control motor speed. The switching cell and motor receive power from a filtered dc supply. A tachometer generator produces a voltage proportional to motor speed. The speed voltage is compared to a speed reference signal voltage and the difference is proportionally integrated to develop a speed error signal voltage. The speed reference signal voltage is developed at a summing node where a current generated by the control's microcontroller is summed with a current proportional to the input ripple voltage of the control's dc supply. The microcontroller also receives a voltage proportional to the control's dc input as a reference. The speed error signal voltage is compared with the output voltage of a current sensor that is in series with the motor feeder arrangement and the comparator's output is used to reset a bistable flip flop. The flip flop controls the switching cell and is set by a high frequency oscillator (100-150 khz). The cell closes when the flip flop is set and opens when the cell is reset. This control determines power absorbed by the motor and improves the motor power factor.
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patent: 5119283 (1992-06-01), Steigerwald et al.
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Patent Abstracts of Japan, vol. 7 No. 103(E-173) 6 May 1983, JP-A-58 026 587 (Hitachi Seisakusho K.K.) May 1983.
Patent Abstrcacts of Japan, vol. 18 No. 29 (E-1492), JP-A-52-060-787 (Isao Takahashi) Jan. 1994.
Digital Power Factor Correction with Non-Sinewave Current, 5th European Conference on Power Electronics and Applications, vol. 7, Guillemin et al., Sep. 1993.
5th European Conference on Power Electronics and Applications, vol. 7, Sep. 1993, Brighton, England pp. 176-182, XP000436185 P Guillemin et al. "Digital power factor correction with non-sinewave current" *p. 177, paragraph 2-p. 178*.
Davis Mark A.
Martin David S.
Schwyn Thomas A.
Whirlpool Europe B.V.
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