29-05-2012, 04:24 PM
Honeywell’s current system
Honeywell’s current system.ppt (Size: 1.38 MB / Downloads: 48)
Background
Honeywell’s current disconnect system
Shear neck
Not effective with variable speeds
Irreversible
Cannot be activated at will
Honeywell’s new disconnect
Needs activation system
Customer Needs
Decelerates ball screw nut to activate disconnect system
Produce required differential torque within given constraints and parameters
Recommended use of eddy current brake system
Mission Statement
Our mission is to develop, design, and test an innovative braking mechanism that will activate a mechanical disconnect system, applicable in a broad range of aerospace generators.
Eddy Current Brake
Produce magnetic field
Changing of Magnetic flux induces eddy currents
Eddy Currents produce another magnetic field opposing first
Opposing magnetic fields create force that reduces velocity.
Design Concepts
A single electro-magnet
Two electro-magnets of opposite Polarity
Two electro-magnets on each side of disc
Rotating arms of electro-magnets
Problem Statement
Activate an existing disconnect system for high-speed Aerospace generator
Non mechanical
Resettable
Activated at will (variable speeds)