WIRELESS COMMUNICATION SYSTEM

To provide a wireless communication system that can be widely applied independently of an inner structure of a rotary machine while suppressing reduction in electric field intensity.SOLUTION: A motor 50 applied with a wireless communication system performs wireless communication between the interior and the exterior of a metal housing 51 configured by engaging a first housing 51a and a second housing 51b with each other. The motor comprises: a wireless sensor unit 5 attached to the first housing; a first passive relay 60 attached to the second housing and provided between the interior and the exterior of the metal housing; and a second passive relay 80 attached to the first housing to relay an electric wave transmitted from the wireless sensor unit to the first passive relay. A reception antenna 85 of the second passive relay is configured by a conductor provided on an antenna substrate 84a. A transmission antenna 81 of the second passive relay 80 is configured by a conductor provided on an antenna substrate 84b. The antenna substrate 84a and antenna substrate 84b are arranged substantially in parallel with each other and adjacent to each other.SELECTED DRAWING: Figure 12 【課題】電界強度の低下を抑制しつつ、回転機械の内部構造に依らず広く適用可能な無線通信システムを提供する。【解決手段】無線通信システムを適用したモータ５０は、第１筐体５１ａと第２筐体５１ｂとが嵌め合わされた金属筐体５１の内部と外部との間で無線通信を行う。第１筐体に取り付けられたワイヤレスセンサユニット５と、第２筐体に取り付けられ、金属筐体の内部と外部との間に設けられた第１の無給電中継器６０と、第１筐体に取り付けられ、ワイヤレスセンサユニットから送信された電波を第１の無給電中継器に中継する第２の無給電中継器８０と、を備える。第２の無給電中継器の受信アンテナ８５は、アンテナ基板８４ａに設けられた導体で構成される。第２の無給電中継器８０の送信アンテナ８１は、アンテナ基板８４ｂに設けられた導体で構成される。アンテナ基板８４ａとアンテナ基板８４ｂとが略平行に近接配置されている。【選択図】図１２