| 摘要 |
A method for driving a resonant electromagnetically-actuated motor, such as those used to scan a light source for date reading applications, is described, wherein (in the preferred embodiment) drive current is applied when the back-EMF induced in the actuator coil is zero and has a specific slope, and that drive current is removed after the induced back-EMF voltage has changed by a predetermined constant value. It is shown that this drive means will drive the aforementioned motor across a scan angle which remains substantially constant regardless of changes in ambient temperature, changes in motor orientation, or externally applied forces.
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