Electricity: motive power systems – Motor-reversing – Armature or primary circuit control
Patent
1999-02-12
2000-06-20
Ro, Bentsu
Electricity: motive power systems
Motor-reversing
Armature or primary circuit control
3889072, 3889075, 388909, H02P 608, H02P 706
Patent
active
060781548
ABSTRACT:
Circuitry (100, 100') for determining actuator position includes four MOS transistors (T1-T4) connected to each side of a bi-directional motor (10). The current flowing through the motor (10) at any given time is proportional to voltages developed across the internal impedances of the transistors (T1-T4). The resulting motor voltages are amplified and high-pass filtered to remove any DC offsets due to the signal amplification. The conditioned motor voltages are then compared to one or more threshold voltages and passed through a one shot circuit (120) to provide detectable pulses for each motor commutation event. Circuitry (106,107) is provided for counting pulses provided by the one shot circuit (120) and, based on a desired motor position, for providing a number of digital control signals to a digital control circuit (104). Digital control circuit (104) is responsive to the number of digital control signals to control the gate voltages of the four transistors (T1-T4) to thereby control the position of the motor (10).
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Kohler James Leo
Madsen Wayne Alan
Manlove Gregory Jon
Werking Paul M.
Delco Electronics Corporation
Funke Jimmy L.
Ro Bentsu
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