Patent ID: 8616775

Claim:
A roller bearing device having a radial-plane arrangement structure of a complex resolver comprising: a roller bearing having an inner ring and an outer ring; an inner-ring supported member supported by the inner ring; an outer-ring supported member supported by the outer ring; a driver that relatively rotates the inner-ring supported member and the outer-ring supported member; a rotation sensor that is arranged between the inner-ring supported member and the outer-ring supported member and outputs a sensor signal that changes according to relative positions thereof, wherein the rotation sensor, the roller bearing, and the driver are arranged on a radially same plane, wherein the rotation sensor includes: a first resolver that outputs a sensor signal in which a fundamental wave component of a reluctance change that changes in synchronization with the rotation of the inner-ring supported member or the outer-ring supported member is a first period; and a second resolver that outputs a sensor signal in which the fundamental wave component of the reluctance change is a second period different from the first period, an oscillator that outputs an excitation signal; and switching means for switching a supply path for the excitation signal supplied from the oscillator to the first resolver and the second resolver such that the excitation signal is supplied to a resolver alternatively selected from the first resolver and the second resolver; wherein a gap face of the rotation sensor is located within two contact angles and within a range of bearing width of the roller bearing in an axial direction and wherein the rotation sensor outputs the sensor signal in which the fundamental wave component of the reluctance change is the first period.