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Magnetic Field Measuring Instrument

IP.com Disclosure Number: IPCOM000097238D
Original Publication Date: 1962-Jul-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Wheeler, WJ: AUTHOR

Abstract

Permanent magnet rotor 1 is disposed within ferromagnetic stator ring 2. At least one Hall probe 3 is evaporated on a substrate deposited on the inner surface of ring 2. Rotor 1 is rotated by devices, not shown. Ring 2 can be moved axially relative to rotor 1 by devices, not shown.

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Magnetic Field Measuring Instrument

Permanent magnet rotor 1 is disposed within ferromagnetic stator ring 2. At least one Hall probe 3 is evaporated on a substrate deposited on the inner surface of ring 2. Rotor 1 is rotated by devices, not shown. Ring 2 can be moved axially relative to rotor 1 by devices, not shown.

When used to check the quality of permanent magnet rotors, this instrument desirably permits the magnetic fields of these rotors to be measured in environments closely simulating those encountered under actual conditions of operation. However, this apparatus may be used as a non-destructive read-only memory, if bits of magnetic information are prerecorded on the periphery of the rotor.

In either event, the advantage of this apparatus is that each Hall probe is rigidly mounted in the system. When used to check the quality of permanent magnet rotors, the magnetic field can be measured more accurately than if a Hall probe had to be inserted between the rotor and the ferromagnetic stator ring which simulates the ring encountered in actual service.

On the other hand, when used as a read-only memory, ring 2 provides greater resolution of the magnetic flux and provides a low reluctance flux path. Thus, ring 2 provides an amplified signal of greater intensity than if the stator ring were of a non-magnetic material. This, in turn, enables an increase in bit density on the rotor.

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