US 12,280,676 B2
Automatic transportation system
Jung Goo Cho, Suwon-si (KR); and Doo Ik Song, Yongin-si (KR)
Assigned to GREEN POWER CO., LTD., Hwaseong-si (KR)
Filed by GREEN POWER CO., LTD., Hwaseong-si (KR)
Filed on Dec. 7, 2021, as Appl. No. 17/544,175.
Claims priority of application No. 10-2020-0170717 (KR), filed on Dec. 8, 2020; and application No. 10-2021-0017342 (KR), filed on Feb. 8, 2021.
Prior Publication US 2022/0176824 A1, Jun. 9, 2022
Int. Cl. B60L 5/00 (2006.01); B60L 3/04 (2006.01); H02H 5/04 (2006.01); H02J 50/12 (2016.01)
CPC B60L 5/005 (2013.01) [B60L 3/04 (2013.01); H02H 5/042 (2013.01); H02J 50/12 (2016.02); B60L 2200/26 (2013.01); B60L 2250/16 (2013.01); H02J 2310/40 (2020.01)] 15 Claims
OG exemplary drawing
 
1. An automatic transportation system moving along a rail and receiving electric power by inductive feeding, the automatic transportation system comprising:
an induction power cable installed along the rail;
an induction power track configured as a closed loop by connecting one or more induction power cables to each other;
an inverter configured to apply an alternating current (AC) to the induction power track;
a lead-in cable configured to connect an output from the inverter to the induction power track;
a heat sensing wire installed inside or outside the induction power cable or the lead-in cable and configured to detect heating of the cable;
a detection device installed inside the inverter and configured to detect an open/short of the heat sensing wire; and
a terminal block configured to connect one or more induction power cables to each other or connect the induction power cable to the lead-in cable, and connect the heat sensing wire to each other,
wherein the terminal block includes a terminal for electrically connecting two cables; and
an overheat detection unit configured to detect overheating of the terminal,
wherein the inverter recognizes not only heating of the induction power cable but also an overheated state of the terminal block by shorting the heat sensing wire using an output from the overheat detection unit when overheating of the terminal is detected.