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Patent Searching and Data


Title:
INVERTER SYSTEM
Document Type and Number:
Japanese Patent JP2009153308
Kind Code:
A
Abstract:

To provide an inverter system having a large braking torque, i.e. high braking performance, under conditions that a motor loss is large but a dc voltage does not become excessive at braking, while the inverter system is designed to suppress the motor loss at power running.

The inverter system includes dc power supply 5 which generates the dc voltage from ac power supply 1, an inverter circuit 6 which outputs ac power supply of a frequency different from the ac power supply 1 from the dc power supply 5, and a motor 7 which receives an output of the inverter circuit 6. In a current waveform at braking between the inverter circuit 6 and the motor 7, its distortion is made larger than that at the power running, so that the loss in the motor 7 at braking can be increased, and the large braking torque can be obtained under the condition that an overvoltage of the dc power supply 5 is not generated.


Inventors:
ASADA KAZUHIKO
Application Number:
JP2007329702A
Publication Date:
July 09, 2009
Filing Date:
December 21, 2007
Export Citation:
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Assignee:
PANASONIC CORP
International Classes:
H02P3/18; D06F33/02; H02P21/00; H02P21/36; H02P27/04
Domestic Patent References:
JP2005102385A2005-04-14
JPH099661A1997-01-10
JP2003047793A2003-02-18
Attorney, Agent or Firm:
Fumio Iwahashi
Hiroki Naito
Daisuke Nagano