Active shield for disk-drum acyclic machine

Details Active shield for disk-drum acyclic machine Active shield for disk-drum acyclic machine

1979-09-12

1981-06-23

Skudy, R.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 52, 310114, 310219, 310268, H02K 3100

Patent

active

042753236

ABSTRACT:
An active shield is attached to an acyclic machine surrounding stacks of interleaved rotor and stator disks and axially aligned with the main excitation coil disposed within the rotor shaft. The active shield surrounds the magnetic disks of the rotor and stator to interact with the magnetic flux field of the main excitation coil to limit flux density outside the stator to predetermined levels. The active shield may be energized alone to provide emergency operation of the machine. The coil acting as the shield is excited to have a polarity opposite that of the main excitation coil, so that outside the active shield the magnetic fields tend to cancel.

REFERENCES:
patent: 3211936 (1965-10-01), Harvey
patent: 3579005 (1971-05-01), Noble
patent: 3585398 (1971-06-01), Harvey
patent: 3586894 (1971-06-01), Mueller
patent: 3944865 (1976-03-01), Jewitt
patent: 4027184 (1977-05-01), Hurley
patent: 4097758 (1978-06-01), Jenkins
patent: 4146807 (1979-03-01), Hatch

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