A MATHEMATICAL MODEL FOR A DRY POWDERED MAGNETIC CLUTCH.
Abstract
A mathematical model was developed for a magnetic clutch. The clutch is an electromechanical device designed to transmit a torque which can be modulated with an electric current. Torque is transmitted through a dry, ferrous powder located between the input and output members. The action of this powder is controlled by a magnetic field. Clutches of this type are produced commercially by Lear, Inc. A physical explanation of the torque-producing mechanism was given, and the output torque was defined in terms of the total flux passing through the powder. The flux produced by a signal current to the clutch is affected by eddy currents, hysteresis and by the the non-constant permeability of the ferrous powder. The eddy current effect can be described by the diffusion equation, and the hysteresis effect by a describing function. The non-constant permeability of the powder is essentially a dynamic effect and is evaluated from the experimental data. Experimental data was given for the clutch, and the correlation between the analytical model and this data was shown. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1960
- Accession Number
- AD0607707
Entities
People
- E. P. Blackburn
Organizations
- TRW Inc.