Commutatorless DC motor drive device
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United States of America Patent
Stats
-
Sep 6, 1983
Grant Date -
N/A
app pub date -
Aug 17, 1981
filing date -
Aug 20, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A commutatorless DC motor drive device in which errors due to offset voltages of differential amplifiers used therein are eliminated to thereby cause the rotor to rotate at a stable speed. Double-balance differential amplifier circuits are arranged to receive outputs of corresponding magnetic sensitive elements, such as HALL elements, upon differential input terminals thereof and external control signals upon differential control voltage terminals thereof. The outputs from the magnetic sensitive elements are amplified with an amplification factor determined by the control signals. The control signals have an amplitude determined in accordance with the rotational speed of the rotor. Output circuits control the amount of current fed to the stator coils in accordance with differential outputs of the double-balance differential amplifier circuits.
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