| 摘要 |
A method and apparatus for operating a brushless permanent magnetic motor at speeds where zero crossings of stator phase voltages becomes unavailable, wherein applications of stator currents to one stator phase is temporarily halted to allow current in the phase to reach zero, and the zero crossings of the internal motor voltage is detected as a surrogate for the zero crossings of the stator phase back EMF. A controller can react to the detected zero crossings as if the phase current was being applied.
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