Abstract: A position detector includes detection coils for outputting two sinusoidal signals that have phases shifted from each other by 90 degrees; subtractors for eliminating offset components included in output signals DCA and DSC output from the detection coils; an interpolation calculator for converting the two signals DCA and DSC in which the offset components have been eliminated into position information IP; a radius calculator for calculating a root-sum-square of the two signals DC and DS output from the detection coils; correlation calculators for respectively multiplying a fluctuation component RDA of an output from the radius calculator by the signals DCA and DSC in which the offset components have been eliminated; low-pass filters (LPFs) for extracting DC components of output values output from the correlation calculators; and an outputter for outputting offset components including offset displacement fractions based on output values COMDC and SOMDC output from the LPFs.

Abstract: A position detector includes detection coils for outputting two sinusoidal signals that have phases shifted from each other by 90 degrees; subtractors for eliminating offset components included in output signals DCA and DSC output from the detection coils; an interpolation calculator for converting the two signals DCA and DSC in which the offset components have been eliminated into position information IP; a radius calculator for calculating a root-sum-square of the two signals DC and DS output from the detection coils; correlation calculators for respectively multiplying a fluctuation component RDA of an output from the radius calculator by the signals DCA and DSC in which the offset components have been eliminated; low-pass filters (LPFs) for extracting DC components of output values output from the correlation calculators; and an outputter for outputting offset components including offset displacement fractions based on output values COMDC and SOMDC output from the LPFs.

Abstract: A scale section is made of a magnetic material. A repeated pattern is recorded at a uniform pitch on the surface of the scale section. A sensor section is provided independently from the scale section. The sensor section is provided with a magnetic position sensor that reads the pattern, on a surface close to the surface of the scale section. Further, the sensor section is provided with a magnetic tilt sensor that detects a tilt between the surface of the scale section and the surface of the sensor section on which the position sensor is located. The magnetic position detector in which the scale section and the sensor section are separated from each other can be efficiently fixed to a detection target using the tilt sensor.

Abstract: A scale section is made of a magnetic material. A repeated pattern is recorded at a uniform pitch on the surface of the scale section. A sensor section is provided independently from the scale section. The sensor section is provided with a magnetic position sensor that reads the pattern, on a surface close to the surface of the scale section. Further, the sensor section is provided with a magnetic tilt sensor that detects a tilt between the surface of the scale section and the surface of the sensor section on which the position sensor is located. The magnetic position detector in which the scale section and the sensor section are separated from each other can be efficiently fixed to a detection target using the tilt sensor.