| US 7,574,873 B2 | ||
| Inverter device and air conditioner using inverter device | ||
| Naomi Goto, Otsu (Japan); Keizo Matsui, Kobe (Japan); and Makoto Yoshida, Kusatsu (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Appl. No. 10/537,982 PCT Filed Dec. 09, 2003, PCT No. PCT/JP03/15709 § 371(c)(1), (2), (4) Date Nov. 08, 2005, PCT Pub. No. WO2004/054085, PCT Pub. Date Jun. 24, 2004. |
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| Claims priority of application No. 2002-356409 (JP), filed on Dec. 09, 2002; and application No. 2003-361709 (JP), filed on Oct. 22, 2003. | ||
| Prior Publication US 2006/0150651 A1, Jul. 13, 2006 | ||
| Int. Cl. H02P 27/04 (2006.01); H02M 1/12 (2006.01) | ||
| U.S. Cl. 62—228.1 [318/803; 363/40] | 12 Claims |
| 1. An inverter device for driving a sensorless DC brushless motor, comprising:
an inverter circuit for switching a direct-current voltage obtained from a direct-current power source and supplying an alternating-current
current of a sinusoidal wave to the sensorless DC brushless motor, wherein the direct-current voltage of the direct-current
power source is switched by three-phase modulation; and
current detecting means for detecting a power supply current between the direct-current power source and the inverter circuit,
wherein the sensorless DC brushless motor includes stator windings of a three-phase wiring (U, V, W) electrically connected
to the inverter circuit and a magnet rotor, and
within a carrier period of the three-phase modulation, a current feeding time is equally added or subtracted in a current
feeding period in each phase of the stator windings, and
the current detecting means is a single current detecting means which is used also for detecting the current flowing in the
stator windings, and by detecting the current flowing in the stator windings as well as detecting the power supply current,
a rotational position of the magnet rotor is judged to thereby control the switching of the inverter circuit.
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