Roller bearing device having radial-plane arrangement structure of rotation sensor
AssigneeNsk Ltd.
InventorsHayao Watanabe, Masaki Kuwahara, Kazuhiro Yoshida
Life of this patent
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Abstract
Provided is a roller bearing device, which is suitable for preventing misdetection of a rotation sensor when a moment load is applied. A thin motor 100 includes a cross roller bearing 14 having an inner ring 14a and an outer ring 14b, a stator 22 supported by the inner ring 14a, a rotor 12 supported by the outer ring 14b, a motor unit 16 that applies rotation torque to the rotor 12, and a resolver 30 that detects a rotation angle position of the rotor 12. The resolver 30, the cross roller bearing 14, and the motor unit 16 are arranged in the recited order from the radially inner side on a radially identical plane.
Claims9
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.
Dependencies are inferred from the claim text.