Wireless sensor system and bearing assembly having built-in wireless sensor

A wireless sensor system comprising:

• one or a plurality of wireless sensor units including a sensor section to detect a target of detection, a sensor signal transmitting section to wirelessly transmit a sensor signal outputted from the sensor section, and an electric power receiving section to wirelessly receive an electric operating power to drive the sensor section and the sensor signal transmitting section;
• a sensor signal receiving section to receive the sensor signal transmitted from the sensor signal transmitting section;
• and
• an electric power transmitting section to wirelessly transmit an electric operating power to the electric power receiving section,
• wherein the wireless sensor unit includes a digitalizing section to digitalize the sensor signal outputted from the sensor section and the sensor signal transmitting section transmits the digitalized sensor signal,
• one of the sensor sections includes a revolution sensor comprising a pulsar ring and a magnetoresistance magnetic sensor disposed in face-to-face relation with the pulsar ring,
• the revolution sensor is a means for generating two or more pulses of different phases, and
• the sensor signal digitalized by the digitalizing section is a signal indicative of the period of the pulses and a direction of revolution.

A wireless sensor system comprising:

• one or a plurality of wireless sensor units including a sensor section to detect a target of detection, a sensor signal transmitting section to wirelessly transmit a sensor signal outputted from the sensor section, and an electric power receiving section to wirelessly receive an electric operating power to drive the sensor section and the sensor signal transmitting section;
• a sensor signal receiving section to receive the sensor signal transmitted from the sensor signal transmitting section;
• and
• an electric power transmitting section to wirelessly transmit an electric operating power to the electric power receiving section,
• wherein the wireless sensor unit comprises an electric power accumulating device or a secondary battery to accumulate the electric power received by the electric power receiving section, and
• the electric power transmitting section is provided in a sensor signal receiving unit having the sensor signal receiving section.

A wireless sensor incorporated bearing assembly including a rolling bearing assembly comprising:

• an inner member;
• an outer member
• a plurality of rolling elements interposed between the inner member and the outer member;
• a wireless sensor system including one or a plurality of wireless sensor units including a sensor section to detect a target of detection, a sensor signal transmitting section to wirelessly transmit a sensor signal outputted from the sensor section, and an electric power receiving section to wirelessly receive an electric operating power to drive the sensor section and the sensor signal transmitting section, a sensor signal receiving section to receive the sensor signal transmitted from the sensor signal transmitting section, and an electric power transmitting section to wirelessly transmit an electric operating power to the electric power receiving section, wherein the wireless sensor unit comprises an electric power accumulating device or a secondary battery to accumulate the electric power received by the electric power receiving section;
• and
• an electric power accumulating device or a secondary battery to accumulate the electric power received by the electric power receiving section.