Magnetic impulse ring, bearing unit and rotary electrical machine comprising a magnetic impulse ring, and method to obtain a magnetic impulse ring
OwnerAnanda Kumar Doddi, Mathieu Hubertinventors
Life of this patent
Estimating the term…
Abstract
A magnetic impulse ring having a central axis that includes a target holder and a target that is fixed to the target holder. The target provides a plurality of alternating South and North magnetic poles. The target is adapted to cooperate with magnetic detection means for tracking the rotation of the magnetic impulse ring around its central axis. The Total Pitch Deviation (TPD) of the magnetic impulse ring is less than or equal to 0.5%.
Claims20
A method of inspecting the quality of a magnetic impulse ring that is being manufactured using a total pitch deviation thereof, the method comprising the steps of:
- providing a target holder;
- molding magnetizable material on the target holder to form a target ring;
- adjusting an outer diameter of the target ring to improve the circularity of the outer diameter with respect to the central axis;
- and
- magnetizing the target ring with a magnetization device to form a plurality of magnetic poles thereon, the plurality of magnetic poles alternating between north magnetic poles and south magnetic poles, such that the single pitch deviation between each of the adjacent ones of the plurality of magnetic poles is small enough that the total pitch deviation of the magnetic impulse ring is less than or equal to zero point five (0.5%) percent to provide improved positional measurement of the magnetic impulse ring during use.
A method of inspecting the quality of a magnetic impulse ring that is being manufactured using a total pitch deviation thereof, the method comprising the steps of:
- providing a target holder;
- molding magnetizable material on the target holder to form a target ring;
- adjusting an outer diameter of the target ring to improve the circularity of the outer diameter with respect to the central axis;
- and
- magnetizing the target ring with a magnetization device to form a plurality of magnetic poles thereon, the plurality of magnetic poles alternating between north magnetic poles and south magnetic poles, such that the single pitch deviation between each of the adjacent ones of the plurality of magnetic poles is small enough that the total pitch deviation of the magnetic impulse ring is less than or equal to (si) zero point five (0.5%) percent to provide improved positional measurement of the magnetic impulse ring during use, wherein the step of magnetizing results in the quality of the magnetized impulse ring being determined without an operation of the magnetized impulse ring for a predetermined number of duty cycles to provide data for subsequent analysis via Fourier transforms.
A method of inspecting the quality of pole placement, on a magnetic impulse ring that is being manufactured using a total pitch deviation thereof, the method comprising the steps of:
- providing a target holder;
- molding magnetizable material on the target holder to form a target ring;
- adjusting an outer diameter of the target ring to improve the circularity of the outer diameter with respect to the central axis;
- and
- magnetizing the target ring with a magnetization device to form a plurality of magnetic poles thereon, the plurality of magnetic poles alternating between north magnetic poles and south magnetic poles, such that the single pitch deviation between each of the adjacent ones of the plurality of magnetic poles is small enough that the total pitch deviation of the magnetic impulse ring is less than or equal to (≤) zero point five (0.5%) percent to provide improved positional measurement of the magnetic impulse ring during use, wherein determining the quality of the magnetized impulse ring's ability to indicate position is determined only using the total pitch deviation.
Dependencies are inferred from the claim text.