WIRELESS SENSOR SYSTEM AND BEARING DEVICE HAVING WIRELESS SENSOR

摘要

There is provided a wireless sensor system having a simple configuration and capable of supplying operation power and receiving a wireless sensor signal to/from a plurality of wireless sensor units. The system includes a plurality of wireless sensor units (4A, 4B) and a sensor signal receiver (5) for wireless-supplying power to the wireless sensor units and receiving wireless sensor signals. The wireless sensor units (4A, 4B) have power reception sections (8A, 8B) for obtaining operation power from an electromagnetic wave of a predetermined power supply frequency f1 by a tuning circuit and a detection rectification circuit, sensor sections (6A, 6B), and sensor signal transmission sections (9A, 9B) for transmitting the signal detected by the sensor sections as a wireless sensor signal of the electromagnetic wave of unique frequencies f2 and f3 which are different from the aforementioned power supply frequency f1. The sensor signal receiver (5) has a supply power transmission section (12) for transmitting the electromagnetic wave of the power supply frequency f1 and a sensor signal reception section (13) capable of receiving wireless sensor signals of the respective unique frequencies f2, f3 transmitted by the plurality of wireless sensor units (4A, 4B).