Apparatus and method for driving synchronous motor

Electricity: motive power systems – Synchronous motor systems – Armature winding circuits

Reexamination Certificate

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C318S700000, C318S722000, C318S723000, C318S724000, C318S400010, C318S400070, C318S400140, C318S400320

Reexamination Certificate

active

08035330

ABSTRACT:
The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value.

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Maeda, Saisuke. “Apparatus and method for driving synchronous motor”. Jan. 25, 2008. U.S. Appl. No. 12/019,736, claims 1,3-21,23 and 24.
U.S. Appl. No. 12/019,736. Maeda, Daisuke et al., claimes 1-24 filed on Sep. 2, 2010.
Table 3-6, p. 43, Chapter 3 of “Easy Way to Technology on Small Motors”, published by Ohm-sha.

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