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Title:
MOTOR DRIVE UNIT
Document Type and Number:
Japanese Patent JP2009159776
Kind Code:
A
Abstract:

To suppress distortion of an input supply voltage at regeneration of power supply in a motor drive unit.

The motor drive unit (1a) includes a converter circuit (2) with a power supply regenerative function to convert input ac power to dc power, and an inverter circuit (3) which receives the dc power to convert it to the ac power, and drives a motor by the ac power thus obtained. The motor drive unit further includes a smoothing capacitor (6) connected to a dc side of the converter circuit, a capacitor (10) for charging which is connected to a dc side of the inverter circuit, and charges a regenerative energy from the motor, and a first circuit (16) which causes a current to flow in one direction from the smoothing capacitor to the capacitor for charging, and a voltage reducing circuit (14) which reduces a voltage of the capacitor for charging by the first circuit, and supplies it to the smoothing capacitor, between the smoothing capacitor and the capacitor for charging.


Inventors:
MATSUBARA SHUNSUKE
YAMADA YUICHI
HANYU SHIGEKI
SAKAI KOJIRO
Application Number:
JP2007337483A
Publication Date:
July 16, 2009
Filing Date:
December 27, 2007
Export Citation:
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Assignee:
FANUC LTD
International Classes:
H02P25/04; H02P3/18; H02P27/06
Domestic Patent References:
JP2004364462A2004-12-24
JP2006101600A2006-04-13
JP2006054947A2006-02-23
Attorney, Agent or Firm:
青木 篤
鶴田 準一
島田 哲郎
伊坪 公一
榎原 正巳
小林 龍



 
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