초록 ▼

An electromagnetic force (EMF) machine with a universal portable power supply is disclosed. The universal portable power supply energizes either a multiple turn flux concentrator or a single turn flux concentrator. The flux concentrators produce magnetic fields that create an outward tension force a

An electromagnetic force (EMF) machine with a universal portable power supply is disclosed. The universal portable power supply energizes either a multiple turn flux concentrator or a single turn flux concentrator. The flux concentrators produce magnetic fields that create an outward tension force adapted to perform non-destructive bond tests (tension proof loading) and/or dent removal operations on panels or the like. The power supply includes a slow current pulse subsystem; a fast current pulse subsystem; slow and fast crowbars; and, a firing control. The firing control controls the production of pulses by the slow and a fast current pulse subsystems, and, the operation of the slow and fast crowbars. The slow pulse subsystem, via the flux concentrator, slowly creates a magnetic field that penetrates the panel; the fast pulse subsystem, via the flux concentrator, rapidly decreases the magnetic field, whereby a negative field gradient is produced across the panel. The negative field gradient exerts the outward tension force on the panel. Further, a set of control switches control the magnitude of the current produced by the slow current pulse subsystem; and, determine the flux concentrator to which the slow and fast pulses are to be applied. Finally, a charging circuit controls the charge level of capacitor banks forming part of the slow and fast current pulse subsystems such that a predetermined ratio exists between the pulses produced by the slow and fast current pulse subsystems.

대표청구항 ▼

An electromagnetic force machine comprising: (a) a single turn flux concentrator including a slow primary winding, a fast primary winding and a single turn secondary work coil; (b) a multiple turn flux concentrator including a multiple turn work coil; and, (c) a universal power supply for energizing

An electromagnetic force machine comprising: (a) a single turn flux concentrator including a slow primary winding, a fast primary winding and a single turn secondary work coil; (b) a multiple turn flux concentrator including a multiple turn work coil; and, (c) a universal power supply for energizing said single and multiple turn flux concentrators, said universal power supply comprising: (1) a slow current pulse susbsystem for producing a relatively slow rising current pulse, said slow current pulse subsystem including at least first and second slow capacitor banks and a slow bank switch connected to said first and second slow capacitor banks for controlling the initiation of said slowly rising current pulse by said slow capacitor banks; (2) a fast current pulse subsystem for producing a relatively fast rising current pulse, said fast current pulse subsystem including a fast capacitor bank and a fast bank switch connected to said fast capacitor bank so as to control the initiation of said relatively fast rising current pulse produced by said fast capacitor bank; (3) shorting means connected to said slow and fast current pulse subsystems for shorting said first and second slow capacitor banks and said fast capacitor bank when enabled by a suitable signal; (4) switch means connected between Said first and second slow capacitor banks for connecting said first and second slow capacitor banks in series or parallel and between said single and multiple turn flux concentrators for selectively applying said relatively slow rising and said relatively fast rising current pulses to said single and multiple turn flux concentrators; and, (5) a control system for controlling the closure of said slow and fast bank switches such that said slow current pulse subsystem first applies said relatively slow rising pulse to the selected one of said single and multiple turn flux concentrators for a period of time adequate for said slowly rising current pulse to achieve a level equal to about 90% or more of its maximum value and, then, said fast current pulse subsystem applies said relatively fast rising current pulse to said selected one of said single and multiple turn flux concentrators such that the magnetic field produced by said relatively slow rising current pulse rapidly collapses.