Title:
LOAD DRIVE SYSTEM AND METHOD OF THEM, AND RAILWAY VEHICLE AND OPERATION METHOD OF THEM
Document Type and Number:
Japanese Patent JP2023154126
Kind Code:
A
Abstract:
To provide a load drive system capable of reducing a torque shock by reactivating the system at a motor rotational speed accurately estimated by suppressing a current off-set error at a free running.SOLUTION: A load drive system comprises: an inverter control circuit that controls an inverter and a switching of the inverter; a current detection circuit that detects a current flowing in a load when a terminal of a load is short-circuited by them; a plurality of frequency filters into which the current detected is input; a selection circuit that selects any one of a plurality of outputs by a determination reference based on a band and an output of each filter. In the load drive system that a free running reactivation is performed by the inverter frequency based on the selection output, an inverter frequency calculation circuit that is connected to an output side of each of the frequency filters, and calculates an inverter frequency for performing the free running reactivation is provided, in which the selection circuit after the step selects one output of the plurality of inverter frequency calculation circuits.SELECTED DRAWING: Figure 1
Inventors:
SUMIDA SATOSHI
SUGIURA TORU
OTSUKA KUNIAKI
SUGIURA TORU
OTSUKA KUNIAKI
Application Number:
JP2022063204A
Publication Date:
October 19, 2023
Filing Date:
April 06, 2022
Export Citation:
Assignee:
HITACHI LTD
International Classes:
H02P27/06; H02P5/46
Attorney, Agent or Firm:
Patent Attorney Corporation Sunnext International Patent Office
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