Motor drive device and air conditioning device
A technology for motor-driven and air-conditioning devices, which is used in electronic commutation motor control, output power conversion devices, and single-motor speed/torque control. It can solve the problem of increased leakage current, increased switching frequency, and increased high-frequency noise. Large and other problems, to achieve the effect of reducing noise and leakage current
Inactive Publication Date: 2004-12-01
SANYO ELECTRIC CO LTD +1
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Problems solved by technology
Also, if the switching frequency of the switching elements of the inverter circuit increases, high-frequency noise increases and leakage current increases
Method used
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[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022] Such as figure 1 As shown, the air conditioner 10 has an outdoor unit 11 and an indoor unit 12 , and an outdoor refrigerant pipe 14 of the outdoor unit 11 and an indoor refrigerant pipe 15 of the indoor unit 12 are connected by connection pipes 24 and 25 .
[0023] The outdoor unit 11 is arranged outdoors. In the outdoor refrigerant piping 14, a compressor 16 is arranged, an accumulator 17 is arranged on the suction side of the compressor 16, a four-way valve 18 is arranged on the discharge side of the compressor 16, and the four-way valve 18 is arranged in this order. Outdoor heat exchanger 19 and electric expansion valve 22. The compressor 16 is driven by a brushless DC motor 16A. In the outdoor heat exchanger 19, the outdoor fan 20 which blows air to the outside from the outdoor heat exchanger 19 is arrange|positioned adjacently. The outdoor fan 20 is driv...
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Provided is a motor-driving device and air-conditioning equipment, wherein the production of noise due to an inverter circuit and leakage current can be reduced. The motor driving device 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 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.
Description
technical field [0001] The present invention relates to a motor drive device and an air conditioner having an inverter circuit. Background technique [0002] In general, an inverter circuit including a rectification circuit converting AC power into DC power, an inverter circuit having a plurality of switching elements and connected to each phase of the stator winding of a brushless DC motor, energizing each phase of the stator winding is known A motor drive device that controls the phase voltages applied to the stator windings of each phase during the energization period, and controls the number of revolutions of the rotor to a target number of revolutions (for example, refer to Patent Document 1). [0003] In such a motor drive device, during the energization period of each stator winding, the switching element corresponding to the inverter circuit is controlled by a pulse width modulated driving signal, so that the phase voltage applied to the stator winding is pulsed. ...
Claims
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IPC IPC(8): F24F11/02F24F11/46F24F11/61F24F11/62F24F11/86F24F11/88H02P6/06H02P6/08H02P6/17
CPCF24F11/89H02M7/5387H02P6/06H02P6/085H02P6/16
Inventor 武田勇一神村刚久保田俊之
Owner SANYO ELECTRIC CO LTD