Magnetic sensor device, rotation detection system including the same, and magnetic field generation device
AssigneeTDK Corporation
InventorYosuke KOMASAKI
Life of this patent
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Abstract
A hollow shaft is formed of a ferromagnetic body, and holds a refrigerant at an inner circumferential side. A magnet is positioned at an outer circumferential side of the hollow shaft, and includes N pole and S pole adjacent in a circumferential direction of the hollow shaft. A magnetic sensor detects a magnetic field of the magnet. The hollow shaft and the magnet are configured so that a first function relating to a shape and characteristics of the hollow shaft and a second function relating to a shape and characteristics of the magnet satisfy a condition for reducing a leakage magnetic field from the magnet from the outer circumferential side to the inner circumferential side of the hollow shaft.
Claims11
A magnetic sensor device comprising:
- a hollow shaft that is formed of a ferromagnetic body and holds a refrigerant at an inner circumferential side;
- a magnet that is positioned at an outer circumferential side of the hollow shaft and includes N pole and S pole adjacent in a circumferential direction of the hollow shaft;
- and
- a magnetic sensor that detects a magnetic field of the magnet, wherein
- the hollow shaft and the magnet are configured so that a first function relating to a shape and characteristics of the hollow shaft and a second function relating to a shape and characteristics of the magnet satisfy a condition for reducing a leakage magnetic field from the magnet from the outer circumferential side to the inner circumferential side of the hollow shaft.
A magnetic field generation device comprising:
- a hollow shaft that is formed of a ferromagnetic body and holds a refrigerant at an inner circumferential side;
- and
- a magnet that is positioned at an outer circumferential side of the hollow shaft and includes N pole and S pole adjacent in a circumferential direction of the hollow shaft, wherein
- the hollow shaft and the magnet are configured so that a first function relating to a shape and characteristics of the hollow shaft and a second function relating to a shape and characteristics of the magnet satisfy a condition for reducing a leakage magnetic field from the magnet from the outer circumferential side to the inner circumferential side of the hollow shaft.
Dependencies are inferred from the claim text.