This is one of the components for the Auctioneer that can be constructed in your trading post. Once you get a 货栈等级2, you will find a broken 古代交易机 on the floor. To fix it, you need to complete the quest 拍卖零件 which requires 5 modules.
Each module is made up of 3-4 components, which individually drop in specific places.
Note that all modules and individual components can be traded, vendored or auctioned.

奥术水晶模块 - Requires 奥术水晶壳, 奥术水晶导管, 奥术水晶放大器, 奥术水晶焦镜. These drop in garrison invasions and in raids.
拍卖行控制模块 - Requires 拍卖行储存卡插槽, 拍卖行连接端口, 拍卖行A.D.D.O.N.S安装程序. These drop in dungeons.
通用语言模块 - Requires 通用语言补偿器, 通用语言过滤器, 通用语言资料库. These drop in Ashran.
超冷却模块 - Requires 超冷却调节器, 超冷却导管, 超冷却制冷剂, 超冷却泵机. These drop in Shadowmoon Valley, Talador or Nagrand.
循环能源模块 - Requires 循环能源转换器, 循环能源外壳, 循环能源内框, 循环能源定序器. These drop in Frostfire Ridge, Gorgrond, or Spires of Arak.

A minor mistake is present in the tooltip:
"Combine a cyclical power converter.."

I had one of these drop at Darktide Roost in Shadowmoon Valley. I think it was off a Goblin or Robot, if that matters.

Just got this item killing Tangleheart cultivators in Grogrond in Tangleheart.

小知识

屏幕截图

视频

循环能源外壳

货栈零件
物品等级：1

售价: 3 21 89

指南