Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Running-speed control
Patent
1981-04-15
1983-06-07
Dobeck, B.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Running-speed control
318317, 318331, 180DIG2, H02P 768
Patent
active
043873251
ABSTRACT:
The speed control circuit detects an actual and selected speed for the wheelchair and supplies power to the wheelchair motors in a manner which tends to bring the actual and selected speeds into conformity. A reference signal circuit detects a speed and direction selected by a joystick and produces a reference signal whose magnitude varies with the selected speed. The reference circuit includes a polarity circuit which detects the polarity of the reference signal to determine whether the motors are to be rotated in a forward or reverse direction. The voltage and current across the armature of the motor are both detected as measures of its actual speed. A comparing circuit compares the actual speed as determined by the armature voltage and current with the selected speed as denoted by their reference signal. Specifically, it subtractively combines the armature voltage and the reference signal to produce a first difference signal. Further, it subtractively combines the first difference signal with the armature current signal to produce a speed error reference signal. The speed error reference signal controls a variable power regulator which varies the amount of power supplied to the motor in a manner which tends to cause the actual and selected speeds to match.
REFERENCES:
patent: 3629633 (1971-12-01), O'Callaghan
patent: 3683253 (1972-08-01), Rummel et al.
patent: 4059786 (1977-11-01), Jones et al.
patent: 4079301 (1978-03-01), Johnson
patent: 4151450 (1979-04-01), Fukuma et al.
patent: 4291260 (1981-09-01), Nixon
patent: 4300081 (1981-11-01), Van Landingham
patent: 4303874 (1981-12-01), Iwai
Dobeck B.
Invacare Corporation
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