PURPOSE: To reduce the number of transmission lines and make a tail cord lightweight by uniting transmission passages that feed power to plural loads equipped at a car, conducting transmission by increasing the voltage of power to be transmitted more than the rated voltage of loads.
CONSTITUTION: Electric power from a three-phase AC power source 3 is received by means of a transmission device 4, and voltage is raised. After boosting, transmission to a car 2 is carried out only by means of a transmission line 27 in a tail cord 10. At the car 2, the voltage of power delivered through the transmission line 27 by means of the transformers 11-15 of receiving devices provided at respective devices and a power source device 17 is converted, and power is fed to respective devices such as a cooler outer cage machine 16, a door motor 22. Thus, transmission passages to the car from the control panel of a device whose power consumption is large, such as the cooler outer cage machine 16 can be united, and by conducting transmission under higher voltage than the rated voltage of a device, it is possible that loss at the transmission passage is made small. As a result, the reduction of the number of transmission lines and the light weight of the tail cord 10 can be realized.
ANDO TAKEYOSHI
SATO NOBUYOSHI
INABA HIROMI
MEGURO TOSHIO
YAHIRO SEINOSUKE
SASAKI TERUO
HITACHI BUILDING SYST ENG