gyro inductance

Does anybody use mechanical gyros anymore? I don't think so, especially for space applications.

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The RIFCA Trihex provides the primary guidance, flight control, and mission sequencing functions for the Delta launch vehicles, guiding the rocket into precise space orbit. It has routinely achieved guidance accuracies at least three times better than mission requirements. L-3's Trihex is a triple-redundant, six Ring Laser Gyroscopes and six accelerometer guidance package that, in the course of over 60 launches, has flown with 100% success and never triggered a single redundancy back up during normal flight operations but Gyro's dont keep generating low voltage dc current while their spinning in zero gravity

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In the hubble all the gyroscopics movement is achieved by a wheel inside each gyro that spins at a constant rate of 19,200 rpm on gas bearings. This wheel is mounted in a sealed cylinder, which floats in a thick fluid. Electricity is carried to the motor by thin wires (approximately the size of a human hair) which are immersed in the fluid. Electronics within the gyro detect very small movements of the axis of the wheel and communicate this information to Hubble's central computer.

Yes their still used in all guidance in satellites but none has been developed to actually produce a dc charge to back up the dry cells for system operations

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The RIFCA Trihex provides the primary guidance, flight control, and mission sequencing functions for the Delta launch vehicles, guiding the rocket into precise space orbit. It has routinely achieved guidance accuracies at least three times better than mission requirements. L-3's Trihex is a triple-redundant, six Ring Laser Gyroscopes and six accelerometer guidance package that, in the course of over 60 launches, has flown with 100% success and never triggered a single redundancy back up during normal flight operations but Gyro's dont keep generating low voltage dc current while their spinning in zero gravity

Help me out here. Laser gyro's aren't mechanical are they? I thought they operated by sending laser light around a fiber optic ring and measuring the interference caused by motion of the ring relative to the absolute velocity of light. Possible because of the special theory of relativity, if you will. Nothing moves but photons. No spinning masses or other 19th century accoutrements.

Don't mention L-3 around me.

Won't it decrease the usefulness of the gyro if its spin rate slows down?

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exactly that=92s why the gimbals on my gyroscope rotate around a magnetic core as the inner magnet spin out of phase with the outer gimbals with the coiled wire, a current flow is induced through the carbon wire creating Direct current 180 degrees out of phase on each gyro gymble from the next precession on the second gamble occurs as well, once initial spin velocity on the central magnetic rotor spins, it maintains this for long periods of time in a zero gravity situation. No other gyro produces and performs like this

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your right no moving parts in RLGs, while more accurate than mechanical gyros, suffer from an effect known as "lock-in" at very slow rotation rates. When the ring laser is rotating very slowly, the frequencies of the counter-rotating lasers become very close (within the laser bandwidth). So at this low rotation, the nulls in the standing wave tend to "get stuck" on the mirrors, locking the frequency of each beam to the same value, and the interference fringes no longer move relative to the detector; in this scenario, the device will not accurately track its angular position over time.

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your right no moving parts in RLGs, while more accurate than

Cool, I know nothing about this. Are these similar to Sagnac Interferometer's, which can sense absolute rotation?

George

That's right, ring laters are double-ended lasers that send light in a ring shaped path so that it interferes with itself, thus producing standing waves. When the hardware is rotated the standing wave crests move slower than the hardware (they'd stand still if the hardware had refractive index 1)

The theory doesn't make it possible, it just explains why it works.

Bye. Jasen

Yes of course a small energy input being the central magnet rotating and acting as a gyro rotor or magneto this would produce a large energy output, violating the law of conservation of energy.

This scenario is only one example of electromagnetic induction. Lenz's Law states that the magnetic field of any induced current opposes the change that induces it.

That=92s the beauty of why this works as the current induced upon the gimbals with the zig zag pattern of carbon fiber wire imbedded is forced to spin around in the opposit direction 180 degrees out of phase from the rotor which cause precession counter spin on the next outer gimbal in opposite direction again. Then the outer most gimbal is now backing in phase with the original direction of spin of the central rotor. Witch is a spherical permanent magnet

Dear extremesoundandlight,

(1) I think you are you saying: the zigzag pattern of wires creates a counter-current or something which does not drain energy from the system even though you are using the gyro as a spinning generator. It is difficult to evaluate this remarkable claim without a diagram indicating the construction. Basically you are saying you have a perpetual motion machine that breaks the laws of thermodynamics, but are not prepared to show how.

(2) You mentioned:

Does this mean you think it would work in zero gravity, but it does not work here on earth?

ravity

due to increased friction on the moving gimbles its not energy effeicient

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Yes, they do. The mechanical gyro market is undergoing a recovery as the realization strikes that fiber-optic gyros are bulky for their performance and piezoelectric gyros just don't give the necessary low noise floor.

One of my clients stabilizes gimbals with mechanical gyros; the piezoelectric ones (even quartz) just can't cut it, and a fiber optic gyro that has the requisite performance displaces about 6x the volume or more -- and that's after you take the gyro's support electronics into account.

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At the point where the gimbals line up in rotation in opposite directions 180 degrees out of phase Lenz law takes over but an electromagnetic null is momentarily achieved as the gimbals armatures pass within one another in opposite directions. So they don=92t lock up. But none of the other gyro scopes have ever produced DC current as they spin in a vacuum