Angular position homopolar reluctance sensor
AssigneeGEC Alsthom SA
InventorJean-Francois Maestre
Life of this patent
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Abstract
A homopolar reluctant sensor comprises a magnetic material rotor including a cylindrical body having at a first end a laminated part comprising the same number of lobes as there are sensor pole pairs and at a second end a ring and a magnetic material stator comprising a cylindrical portion provided with an excitation coil energized by an alternating supply, a first ring having notches and defining with said laminated part a first airgap and a smooth second ring defining with said rotor ring a second airgap. The stator notches are provided with a winding such that the voltage induced therein is sinusoidal and free of harmonics. The envelope of this voltage represents, apart from a phase-shift, the position of the rotor relative to the stator.
Claims6
In a homopolar reluctant sensor having a number of sensor pole pairs, and comprising:
- a magnetic material rotor (10) having an axis (XX) of rotation and comprising a cylindrical body (11) having, at a first end, a coaxial laminated part (13) with a number of lobes (13A, 13B) equal to said number of sensor pole pairs, and, at an opposite second end, a coaxial rotor ring (14);
- and
- a coaxial magnetic material stator (20) comprising a cylindrical portion provided with an excitation coil (35) energized by an alternating current supply,
- a first coaxial stator ring (22) having stator notches (23) and defining with said laminated part a first airgap (31), and
- a coaxial smooth second ring (24) defining with said rotor ring (14) a second airgap (32),
- wherein said stator notches (23) are provided with a stator winding (41, 42) wound in such a manner that the voltage induced therein is sinusoidal and free of harmonics, and that the envelope of said voltage represents, apart from a phase-shift, an angular position of said rotor (10) relative to said stator (20).
Dependencies are inferred from the claim text.