A New Moving-Magnet Instrument for Direct Current
- 1 August 1942
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Transactions of the American Institute of Electrical Engineers
- Vol. 61 (8) , 586-588
- https://doi.org/10.1109/t-aiee.1942.5058569
Abstract
A new type of d-c instrument is described in this paper. It comprises a diametrically magnetized cylindrical moving- magnet element, a hollow copper damping cylinder surrounding the moving element, a fixed coil, control magnets having a very high coercive force, and an enclosing magnetic shield made of mumetal. The field of the control magnet and the field of the fixed coil have a relatively large angular displacement. The angular position of the vector sum of these fields varies with the current through the coil, and the moving element follows this vector. The scale distribution is nearly uniform for a 90-degree scale. The characteristics compare favorably in many respects with those of a D'Arsonval instrument.Keywords
This publication has 2 references indexed in Scilit:
- Nickel-iron alloys of high permeability, with special reference to mumetalJournal of the Institution of Electrical Engineers, 1937
- XIX.Some magnetic alloys and their propertiesJournal of Computers in Education, 1931