Title:
POWER CONVERSION DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/168656
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a power conversion device which enables high-accuracy detection of non-connection between the electric power conversion device and an electric motor regardless of a load state. To achieve this, the present invention provides a power conversion device provided with a power conversion unit having a rectifier and a switching circuit and a control unit for controlling the switching circuit, wherein the control unit has a current reproduction unit which calculates values of currents flowing in each phase of an electric motor using information from the power conversion unit and outputs three-phase current values, a speed control unit which compares an externally input speed command with the three-phase current values and outputs a PWM control command, a PWM control unit which outputs a switching signal to the switching circuit on the basis of the command from the speed control unit, and a non-connection determination unit which outputs an error when the absolute values of the current values of the current reproduction unit have fallen below a predetermined threshold value within a predetermined determination time period, the determination time period being defined as a time period after an increase time has passed from when power is input to the power conversion unit and before a positioning operation has ended.
Inventors:
IWASE YUUTA (JP)
KOBAYASHI YOUHEI (JP)
TAGUCHI YOSHIYUKI (JP)
KOBAYASHI YOUHEI (JP)
TAGUCHI YOSHIYUKI (JP)
Application Number:
PCT/JP2018/009055
Publication Date:
September 20, 2018
Filing Date:
March 08, 2018
Export Citation:
Assignee:
HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD (JP)
International Classes:
H02M7/48
Foreign References:
| JP2009136129A | 2009-06-18 | |||
| JP2013106424A | 2013-05-30 |
Attorney, Agent or Firm:
SEIRYO I.P.C. (JP)
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