JUNE PROGRESS REPORT GOVERNED SPEED D. C. MOTOR

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03424A002000070003-1
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: September 19, 2011
• Sequence Number: 3
• Content Type: REPORT

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Sanitized Copy Approved for Release 2011/09/19 CIA-RDP78-03424AO02000070003-1
ELECTRO-MECHANICAL DESIGN AND PRODUCTION CONSULTANT ? fi C Ian
25X1
At the start of this investigation, it was decided that two approaches to the
problem would be made:
(a) A governor would be made with two pairs of contacts which would open
the armature circuit at symmetrically opposite points and add resistance
to the armature to decrease the current, thereby decreasing the speed.
The electrical diagram of this method is shown below.
(b) An auxiliary field would be wound on the magnet structure and a single
governor contact would close at the governing speed which would energize
the field, increasing the flux and slowing down the motor. The electrical
diagram is shown below.
As soon as a layout of the motor was made, it was seen that there was no room for
an auxiliary field to be wound on the pole structure, so method (b) was abandoned.
Another method was conceived at this point. A winding could be added to the arma-
ture spanning approximately 1800. This winding would be isolated from the other
windings; and at a preset speed, the contact could be closed to cause a closed loop
in the armature . This loop, by dissipating power in itself, would cause a damping
torque which would slow the rotation down. The electrical diagram is shown below.
Sanitized Copy Approved for Release 2011/09/19: CIA-RDP78-03424AO02000070003-1
 Sanitized Copy Approved for Release 2011/09/19: CIA-RDP78-03424AO02000070003-1
ELECTRO-MECHANICAL DESIGN AND PRODUCTION CONSULTANT
CONFIDENTIAL
This could also be combined with method (a) to provide a two step function
as shown by the diagram below.
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PAMP I NG 13 A
f iSioR
The design of the governor blades themselves will be as shown below.
In this manner, the rectangular metal block will hold the blades firmly so that
no creep will occur, and the double blades of the same spring material will com-
pensate for temperature change.
Sanitized Copy Approved for Release 2011/09/19: CIA-RDP78-03424AO02000070003-1