Magnetic sensor unit less responsive to leaking magnetic flux
AssigneesNippon Soken, Inc., Denso Corporation
InventorsMasao Tokunaga, Kenji Takeda, Tomomitsu Kamiya
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Abstract
A magnetic sensor unit includes an actuator motor and a magnetic position sensor. The actuator motor has a magnetic circuit including motor magnets. The magnetic position sensor includes a sensor magnet and a hall element for detecting magnetic flux. Magnet clearances are formed between the motor magnets. The hall element is disposed outside of the motor to detect the magnetic flux in a direction penetrating through the magnet clearances, and which is perpendicular to a direction from one of the motor magnets to the other. In this disposition of the hall element, it is restricted that the hall element detects leaking magnetic flux from the motor magnets.
Claims9
A magnetic sensor unit comprising:
- an actuator motor having a magnetic circuit;
- and
- a magnetic position sensor for magnetically detecting a rotational position of the actuator motor, the magnetic position sensor including;
- a magnetic flux detecting means;
- and
- a magnetic flux generating means, which generates a predetermined amount of magnetic flux toward the magnetic flux detecting means in accordance with the rotational position of the actuator motor,
- wherein the magnetic flux detecting means is disposed in a position and a direction outside of the magnetic circuit, where the magnetic flux detecting means is least unresponsive to leaking magnetic flux of the magnetic circuit.
Dependencies are inferred from the claim text.