Title:
Electromotive construction machinery
Document Type and Number:
Japanese Patent JP5938341
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To suppress an overcurrent generated by a star/delta connection circuit as an electric motor is actuated without using a reactor when electric power is supplied from an electric power supply vehicle.SOLUTION: A control device 21 includes a power supply determination part 21a which determines which of a cable 101 of a commercial power supply 100 and a cable 30 of a power supply vehicle 50 is connected, and a circuit switching control part 21b which controls a circuit switching part 21c according to a signal from the power supply determination part 21a, and the circuit switching control part 21b is configured to control the circuit switching part 21c so that when an electric motor 7 is actuated, a star/delta connection circuit 21d serves as a star connection circuit when the power supply determination part 21a determines that the commercial power supply 100 is connected, and to control the circuit switching part 21c so that the star/delta connection circuit 21d serves as a delta connection circuit continuously from the actuation of the electric motor 7 when the power supply determination part 21a determines that the cable 30 of the power supply vehicle 50 is connected.
Inventors:
Tetsuhiro Doi
Hideyuki Hamano
Ken Fujita
Hideyuki Hamano
Ken Fujita
Application Number:
JP2012275866A
Publication Date:
June 22, 2016
Filing Date:
December 18, 2012
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F9/00; H02P1/32
Domestic Patent References:
| JP2009097270A | ||||
| JP2000175487A | ||||
| JP4355697A |
Attorney, Agent or Firm:
Patent Business Corporation Takewa International Patent Office