Document Type and Number:
Japanese Patent JPS4874275
Kind Code:
A
Abstract:
A permanent magnet meter for providing a scale indication of the magnitude of an electrical signal. The meter comprises a permanent magnet rotationally supported by a plurality of thin vanes loosely fitted through slots therein to allow rotation of one vane with respect to another. An arctuate flux path of high permeability material is spaced from the permanent magnet to receive the magnetic flux through an air gap which increases with rotation of the magnet. The magnetic force between the magnet and flux path torques the magnet to a position of minimum air gap and biases the vanes pivots to minimize the motion resulting from the looseness of fit between the vanes. An electrical coil is wound about the flux path and responds to the electrical signal being measured to provide a flux in the path counteracting that from the permanent magnet and causing rotation of the permanent magnet to a point of equilibrium at a new angle defined by an alteration in the permanent magnet flux in response to the coil induced flux.
Application Number:
JP12634272A
Publication Date:
October 06, 1973
Filing Date:
December 13, 1972
Export Citation:
International Classes:
G01R1/38; G01R5/16; (IPC1-7): G01R1/02