| 摘要 |
PURPOSE: An operating method of sensorless DC motor having bridge type inductance detective circuit and device thereof is provided to enhance reliability. CONSTITUTION: The operating device of sensorless DC motor having bridge type inductance detective circuit comprises: a AC voltage source(10) for presenting AC voltage signals; bridge circuits(12,14,16) coupled to respective phase coil for outputting the difference voltage signal between a reference voltage signal and the terminal voltage signal of the phase coil as an inductance detecting signal by receiving the AC voltage signals; amplifiers(18,20,22) for amplifying respective inductance detecting signal of the bridge circuits; a communication controller(24) comparing the sizes of the inductance detecting signals about the amplified respective phase, and deciding initial position for magnetizing the other two phase except a phase having maximum value; and a driving unit(26) presenting driving current to a pair of phase coils in response to the control of the controller.
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