| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor-driving device and air-conditioning equipment, wherein the production of noise due to an inverter circuit and leakage current can be reduced. <P>SOLUTION: The motor driving device 31 comprises an inverter circuit 60, that has a plurality of switching elements and is connected with the stator winding in each phase of a brushless DC motor 16A. The phase voltage applied to the stator winding in each phase is controlled during conducting period, during which the stator winding in each phase is energized, and the number of revolutions of a rotor 27 is thereby controlled to the targeted number of revolutions. The motor-driving device 31 further comprises an inverter circuit control unit 41b that, during conducting periods for stator windings 26u, 26v, and 26w in the respective phases, keeps the corresponding switching elements on; a number-of-revolutions detecting unit 41d that detects the number of revolutions of the rotor 27; a comparison unit 41e, that compares the number of revolutions of the rotor 27 with the target number of revolutions; and a voltage-raising/lowering inverter unit 54 that regulates the direct-current voltage to be applied to the inverter circuit 60, based on the result of the comparison by the comparing unit 41e. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
