公开(公告)号：CA1234543A

公开(公告)日：1988-03-29

申请号：CA439908

申请日：1983-10-28

Applicant: UNITED TECHNOLOGIES CORP

Inventor： HARNER KERMIT I ,  NIESSEN FRANK R ,  SHERMAN ROBERT

IPC: F03D7/04 ,  F03D7/02 ,  F03D11/00

Abstract: A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 and 30) for providing signals indicative of generated (output) power or torque and the rotational frequency of the wind turbine rotor. The output and rotor speed signals are input to a function generator which, in response to such signals, provides a signal indicative of the minimum pitch angle. H1031

公开(公告)号：CA1242511A

公开(公告)日：1988-09-27

申请号：CA517027

申请日：1986-08-28

Applicant: UNITED TECHNOLOGIES CORP

Inventor： NIESSEN FRANK R ,  SCHNEIDER ROY W

IPC: B64C11/50 ,  H02P5/52 ,  G05D13/62

Abstract: PROPELLER SYNCHROPHASER AND MODE LOGIC An improved slave propeller synchrophaser and mode logic for a multi-propeller aircraft is disclosed. A designated master propeller has at least one associated slave propeller which has its speed and phase controlled with respect to the master by initially controlling the speed of -the slave propeller to within a selected constant number of RPM of the master so that the master and slave propellers are periodically in phase and then switching to phase control for controlling the speed of the slave propeller in the presence of a phase difference signal having an absolute magnitude less than a selected absolute magnitude. A selected phase difference relationship between the master and the slave may thus be effected with minimum transient effect on the speed of the slave propeller.