Electricity: motive power systems – Constant motor current – load and/or torque control
Patent
1992-05-28
1993-12-14
Ro, Bentsu
Electricity: motive power systems
Constant motor current, load and/or torque control
318139, 318599, H02P 706
Patent
active
052706249
ABSTRACT:
A power wheelchair (10) includes wheels (12a and 12b) that are reversibly driven by electric motors (24a and 24b) included in respective ones of electric motor drives (170). The electric motor drives (170) provide driving voltage pulses (142) of a pulse-width-modulated driving voltage (144) to respective ones of the motors 24a and 24b), and the electric motor drives (170) provide dynamic braking pulses (150) that are interposed intermediate of respective ones of the driving voltage pulses (142). The maximum width (146) of the driving voltage pulses (142) is selectively adjusted by a removable speed control knob (46) that is connected to a pair of ganged maximum speed potentiometers (48), thereby adjustably determining the maximum speed of the conveyance (10). The maximum torque of the power wheelchair (10) is selectively adjusted by a removable torque control knob (50) that is connected to a pair of ganged torque enhancement controls (52). Torque enhancement is achieved by sampling torque of each of the motors (24a and 24b) during a selected portion (190) of constant time periods (148) of the pulse-width-modulated driving voltage (144). Sampling of motor torque is done subsequent to a dynamic braking pulse (150) and prior to a driving voltage pulse (142) in a delay (164) for a portion (190) of a constant time period (148).
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Miller Wendell E.
Ro Bentsu
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