Accession Number:

AD0607707

Title:

A MATHEMATICAL MODEL FOR A DRY POWDERED MAGNETIC CLUTCH.

Descriptive Note:

Final rept.,

Corporate Author:

TRW SPACE TECHNOLOGY LABS LOS ANGELES CALIF

Personal Author(s):

• Blackburn,E. P.

Report Date:

1960-07-01

Pagination or Media Count:

86.0

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

Descriptors:

• (*CLUTCHES
• MATHEMATICAL MODELS)
• (*MATHEMATICAL MODELS
• CLUTCHES)
• OPERATION
• TORQUE
• EQUATIONS
• SYNCHROS
• IRON
• POWDER METALS
• SIMULATION
• FEEDBACK
• CONTROL SYSTEMS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE