US 12,724,096 B2Granted

Magnetic compensation circuit for linear hall sensors

AssigneeCircor Aerospace, Inc.

InventorAli Sarikhani

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Abstract

A motor assembly. The assembly includes a ferromagnetic enclosure having an inner surface, an outer surface, and a body disposed between the inner and outer surfaces. The body includes a first portion having a first predetermined thickness and a second portion having a second predetermined thickness. The enclosure includes first and second notches in the outer surface. The first notch is positioned in the first portion of the body. The second notch is positioned in the second portion of the body. A position of the first notch is configured to be aligned with a position of a first magnetic sensor of a motor. A position of the second notch is configured to aligned with a position of a second magnetic sensor of the motor. The ferromagnetic enclosure is configured to compensate a magnetic field detected by at least one of the first magnetic sensor and the second magnetic sensor.

Claims19

Dependent claims

A ferromagnetic compensation apparatus, comprising:

a ferromagnetic enclosure having
an inner surface;
an outer surface;
a body disposed between the inner surface and the outer surface, wherein the body includes a first portion having a first predetermined thickness and a second portion having a second predetermined thickness, wherein the first portion has a first radial distance defined by a first arc angle value and the second portion has a second radial distance defined by a second arc angle value;
a first notch in the outer surface, the first notch is positioned in the first portion of the body;
and
a second notch in the outer surface, the second notch is positioned in the second portion of the body;
wherein a position of the first notch is configured to be aligned with a position of a first magnetic sensor of a motor, and a position of the second notch is configured to aligned with a position of a second magnetic sensor of the motor;
wherein the ferromagnetic enclosure is configured to compensate a magnetic field detected by at least one of the first magnetic sensor and the second magnetic sensor.

6 more elements

A motor assembly, comprising:

one or more magnets positioned about a rotor;
a stator enclosing the one or more magnets;
a first and a second magnetic sensors positioned in at least one of the stator and the rotor;
a ferromagnetic enclosure enclosing at least a portion of the stator and having
an inner surface;
an outer surface;
a body disposed between the inner surface and the outer surface, wherein the body includes a first portion having a first predetermined thickness and a second portion having a second predetermined thickness;
a first notch in the outer surface, the first notch is positioned in the first portion of the body;
and
a second notch in the outer surface, the second notch is positioned in the second portion of the body;
wherein a position of the first notch is configured to be aligned with a position of the first magnetic sensor, and a position of the second notch is configured to aligned with a position of the second magnetic sensor;
wherein the ferromagnetic enclosure is configured to compensate a magnetic field detected by at least one of the first magnetic sensor and the second magnetic sensor.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/653,255Filed 2 May 2024
Published: US 2025/0341597 A16 Nov 2025
Granted: 1 Sep 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

G01D 5/145
Using Hall-effect devices: influenced by the relative movement between the Hall device and magnetic fields
G01R 33/3873
Compensation of inhomogeneities: using ferromagnetic bodies ; Passive shimming
G01R 33/0005
Arrangements or instruments for measuring magnetic variables: geometrical arrangement of magnetic sensor elements; Apparatus combining different…
G01R 33/0035
Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration: calibration of single magnetic…