Compact rotary magnetic position sensor having a sinusoidally varying output

A rotary position sensor comprising:

• a magnetized ring rotatable about a rotation axis;
• an outer core of a ferromagnetic material nonrotatable about the rotation axis, said outer core being concentrically disposed relative to said axis of rotation;
• an annular air gap located concentrically between said outer core and said magnetized ring;
• and
• at least one magnetic flux density sensor selectively located at said air gap in stationary position with respect to said outer core;
• wherein the magnetization of said ring provides a magnetic field oriented in a plane perpendicular to said rotation axis;
• wherein said ring is tangentially magnetized with at least one pair of poles.

A rotary position sensor comprising:

• a magnetized ring rotatable about a rotation axis;
• an outer core of a ferromagnetic material nonrotatable about the rotation axis, said outer core being concentrically disposed relative to said axis of rotation;
• an annular air gap located concentrically between said outer core and said magnetized ring;
• an annulus located between said outer core and said ring;
• and
• at least one magnetic flux density sensor selectively located at said air gap in stationary position with respect to said outer core;
• wherein the magnetization of said ring provides a magnetic field oriented in a plane perpendicular to said rotation axis;
• wherein said ring is radially magnetized with at least one pair of poles;
• and wherein said annulus is composed of a nonmagnetic material, said at least one magnetic flux density sensor being embedded in said annulus;
• wherein said rotary position sensor further comprises an inner core of ferromagnetic material disposed between said axis of rotation and said ring.

A rotary position sensor comprising:

• a magnetized disk rotatable about a rotation axis;
• an outer core of a ferromagnetic material nonrotatable about the rotation axis, said outer core being concentrically disposed relative to said axis of rotation;
• an air gap located between said outer core and said magnetized disk;
• at least one magnetic flux density sensor selectively located at said air gap in stationary position with respect to said outer core;
• and
• an annulus located between said outer core and said disk, said annulus being composed of a nonmagnetic material, said at least one sensor being embedded in said annulus;
• wherein the magnetization of said disk is homogeneously magnetized and provides a magnetic field oriented in a plane perpendicular to said rotation axis.

A rotary position sensor comprising:

• a magnetized ring rotatable about a rotation axis;
• an outer core of a ferromagnetic material, said outer core being concentrically disposed relative to said axis of rotation;
• an air gap located between said outer core and said magnetized ring;
• and
• at least one magnetic flux density sensor selectively located at said air gap;
• wherein the magnetization of said ring provides a magnetic field oriented in a plane perpendicular to said rotation axis;
• and
• wherein said ring is homogeneously magnetized;
• and wherein said rotary position sensor further comprises an inner core of ferromagnetic material disposed between said axis of rotation and said ring.