G - Physics – 01 – C
Patent
G - Physics
01
C
79/10, 318/93
G01C 19/08 (2006.01) G05B 5/01 (2006.01) H02P 25/02 (2006.01)
Patent
CA 1196374
Abstract of the Disclosure Known gyroscope motor control systems have a phase- locked loop circuit including a voltage-controlled oscillator which produces the drive signal for the motor. The frequency of the oscillator is controlled by a phase comparator which produces an output dependent on the difference in phase between a reference frequency and a feedback signal from the motor drive signal. In the present invention, a capacitive pick- off senses the speed of rotation of the gyroscope inertia wheel, a signal in response to this speed being supplied to a directional phase discriminator together with the feedback signal. The output of the discriminator varies with change in phase difference between its two inputs, and is supplied via a switching transistor to the input of the oscillator to effect minor variations in its frequency such as to reduce fluctuations in motor speed. The transistor is held off until there is substantial synchronism with the motor drive signal and the inertia wheel speed.
413412
Fetherstonhaugh & Co.
Smiths Industries Public Limited Company
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