Fluid reaction surfaces (i.e. – impellers) – Having positive means for impeller adjustment
Patent
1992-09-22
1994-01-25
Kwon, John T.
Fluid reaction surfaces (i.e., impellers)
Having positive means for impeller adjustment
416159, 416162, 318722, F04D 2936
Patent
active
052810941
ABSTRACT:
Blade pitch of variable pitch blades is changed by an actuator having first and second ac machines. The first ac machine is excited with ac power to apply a motoring torque to a control shaft of the actuator, thereby causing blade pitch to change in one direction. The second ac machine is excited with appropriate power to apply a braking torque to the control shaft, thereby causing blade pitch to change in an opposite direction. When the second ac machine is an induction machine, dc excitation will brake the control shaft. When the second ac machine is a synchronous machine, an ac excitation causing a retarding magnetic field will brake the control shaft.
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"Direct and Alternating Current Machinery" 2nd Edition by Jack Rosenblatt and M. Harold Friedman: Chapter 17 Polyphase Induction Motor, pp. 265-266, Chapter 18 pp. 349-351, 358-360.
Fizer Leroy A.
Mc'Carty Frederick B.
Wilson Daniel E.
Wuertz Kenneth L.
Allied-Signal Inc
Black Joseph R.
Kwon John T.
Walsh Robert A.
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