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Topic: Synchronous rotation


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In the News (Mon 15 Jul 19)

  
 Kids.Net.Au - Encyclopedia > Synchronous rotation
Synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on it's axis as it does to make one orbit; and as such, always keeps the same hemisphere pointed at the body it is orbiting.
The Moon and the Earth have a synchronic relationship.
In fact, most moons in the solar system have synchronous rotation due to tidal locking.
www.kids.net.au /encyclopedia-wiki/sy/Synchronous_rotation   (94 words)

  
 Rotation of Europa
Even if the silicate interior were locked into synchronous rotation, an ocean might allow the surface to decouple from the silicate interior permitting the ice shell to rotate at a different rate.
/day for synchronous rotation) can be obtained by measuring the positions of surface features relative to the terminator as imaged by Galileo, and comparing the results with similar measurements of the positions of the same features relative to the terminator as imaged by Voyager 2 17 years earlier.
An independent determination of rotation was attempted by considering the position of the crater Cilix (1.7f N, 181.9f W), which appears close to the terminator on a Galileo image taken on its third orbit.
pirlwww.lpl.arizona.edu /HIIPS/Publications/hoppa_rotation   (4531 words)

  
  The Moon
This synchronous rotation is a result of torque having slowed down the Moon's rotation in its early history, a process known as tidal locking.
This synchronous rotation is only true on average because the Moon's orbit has definite eccentricity.
As a result, some of the Earth's rotational momentum is gradually being transferred to the Moon's orbital momentum, resulting in the Moon slowly receding from Earth at the rate of approximately 38 mm per year.
library.thinkquest.org /04oct/00843/hold_eng.html   (832 words)

  
  * Synchronous rotation - (Astronomy): Definition
Synchronous Rotation - Rotation for which the period of rotation is equal to the period of revolution.
Rotation whose period is equal to the orbital period.
Tidally locking (or synchronous rotation of the star and planet) may eventually cause the destruction of a life-sustaining atmosphere through condensation on the cold, perpetually dark side of the planet.
en.mimi.hu /astronomy/synchronous_rotation.html   (552 words)

  
 Variable mechanical advantage shift lever - Patent 4497396
Synchronized positive clutch assembly 14 may be shifted rightwardly to engage gear 18 with shaft 20 or may be shifted leftwardly to engage gear 16 with shaft 20.
Synchronized positive clutch assembly 14 includes a double ended axially movable clutch member 30 which is splined to shaft 20 for axial movement relative thereto and rotation therewith.
Upon achievement of synchronous rotation of the positive clutch members and subsequent unblocking of the blocker, further axial movement of the axially movable clutch member 30 through the blocker and into positive engagement with the selected positive clutch member requires a relatively large axial movement with a relatively small axial force.
www.freepatentsonline.com /4497396.html   (3660 words)

  
 [No title]
The rotational speed of this motor/generator is determined by the frequency of the power supplied by the ac current, by the configuration of the primary winding, and by the load that is rotated by this motor/generator.
When the rotating electrical circuit is in synchronism with the rotating magnetic field in the air gap of the motor, the current in the rotating electrical circuit is zero.
A "synchronous motor/generator" is an ac motor/generator in which an ac current in a first member (either the rotor or the stator) produces a temporally periodic magnetic field that interacts with a temporally constant magnetic field produced by a second member (either the stator or the rotor).
www.godunov.com /Bucky/patents-fulltext/05325002   (5847 words)

  
 Synchronous rotation: Definition and Links by Encyclopedian.com
Synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on it's axis as it does to make one orbit; and as such, always keeps the same hemisphere pointed at the body it is orbiting.
The Moon and the Earth have a synchronic relationship.
In fact, most moons in the solar system have synchronous rotation due to tidal locking.
www.encyclopedian.com /sy/Synchronous-rotation.html   (237 words)

  
 Geosynchronous orbit help - Wiki at Help.com   (Site not responding. Last check: )
Synchronous orbits exist around all moons, planets, stars and fl holes —unless they rotate so slowly that the orbit would be outside their Hill sphere.
Most inner moons of planets have synchronous rotation, so their synchronous orbits are, in practice, limited to their leading and trailing Lagrange points.
Objects with chaotic rotations (such as Hyperion) are also problematic, as their synchronous orbits keep changing unpredictably.
help.com /wiki/Geosynchronous_orbit   (328 words)

  
 Synchronous drive arrangement for a printer - Patent 6592481
It is another object of the present invention to provide a synchronous drive arrangement for timing belt connection, which is included in a printer, capable of reducing the deviation of synchronous rotation between print drums, and a synchronous driving method therefor.
In accordance with the present invention, a synchronous drive arrangement includes a drive member and a driven member each including a respective toothed pulley, and a timing belt passed over the toothed pulleys for causing the drive member and driven member to rotate in synchronism with each other.
Assume that the pinions, not shown, are rotated to cause the frame 354 to move upward in a direction X. Then, the pulleys 340 and 342 are moved upward together with the frame 354, causing the print drums 308 and 310 to rotate in directions a and b, respectively.
www.freepatentsonline.com /6592481.html   (6332 words)

  
 Tectonic Processes on Europa:
Together these considerations provide a model in which currently observed cracks were produced as Europa rotated through the last several tens of degrees relative to the direction of Jupiter, with crack patterns affected by stress due to both non-synchronous rotation and diurnal tides, possibly during the past several hundred thousand years.
For a satellite on an eccentric orbit, even if it rotates synchronously, the magnitude and orientation of the tidal distortion due to the planet changes with a period equal to the orbital period.
For any very small angle of rotation, the pattern is similar, with amplitudes approximately proportional to the angle, and with symmetry offset from the cardinal longitudes (0o, 90o, 180o, 270o) by 45o.
pirlwww.lpl.arizona.edu /HIIPS/Publications/greenberg_tectonics   (9541 words)

  
 Synchronous rotation   (Site not responding. Last check: )
In astronomy, synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and therefore always keeps the same hemisphere pointed at the body it is orbiting.
The Moon is in synchronous rotation about the Earth.
In fact, most moons in the solar system have synchronous rotation due to tidal locking.
www.serebella.com /encyclopedia/article-Synchronous_rotation.html   (124 words)

  
 Theory of the Earth-synchronous rotation of Venus
noted in 1966 that the radar observations of the rotation period of Venus gave a figure remarkably close to one at which Venus would present the same aspect to the Earth at each inferior conjunction.
The rotation would continue to slow down due to tidal friction, and could not have been arrested in the resonance.
As the rotation speed approached this value, the torque necessary for capture into a resonance would have become very small, and the effect exerted by the Earth might then be sufficient.
www.nature.com /nature/journal/v277/n5694/abs/277280a0.html   (448 words)

  
 Could you explain what causes the Moon's synchronous rotation?
The tidal force of the Earth's gravitational field raises solid-body tides on the Moon causing the Moon to be deformed into a non-spherical body resembling a football.
The Moon was originally rotating faster than it is now so that 3-4 billion years ago it was not orbiting the Earth as fast as it was rotating about its axis.
So, a combination of the Moon's initial deformation when it was molten and solidified in the Earth's tidal gravitational field, together with the on-going tidal deformation, leads to a preferred orientation to the Moon in its orbit which the system relaxes to over billions of years.
www.astronomycafe.net /qadir/q277.html   (453 words)

  
 The Nine Planets Glossary
The average period of revolution of the moon around the earth in reference to a fixed star, equal to 27 days, 7 hours, 43 minutes in units of mean solar time.
the orbital radius at which the satellite's orbital period is equal to the rotational period of the planet.
said of a satellite if the period of its rotation about its axis is the same as the period of its orbit around its primary.
www.seds.org /nineplanets/nineplanets/help.html   (4940 words)

  
 Synchronous Belts Technology - APQS -  Longarm Quilting
Synchronous belts operate on a basic principal: molded teeth of the belt and mating grooves of the pulley make positive engagement.
Synchronous belts wrap around the pulley by means of flexion and not by rotation of articulated parts.
Synchronous transmission between the top needlebar shaft and the bottom hook shaft is a must to prevent slippage and maintain precise relative postioning
www.apqs.com /comparebelt.htm   (494 words)

  
 [63.05] Cycloidal cracks on Europa: Improved propagation parameters and rotation implications
In general, minimal variation of model parameters between the arcs of a cycloid chain results in greatly improved fits.
Furthermore, accounting for stress accumulated during non-synchronous rotation, in addition to diurnal stress, allows even better fits.
It confirms the finding that only a few cracks are formed per cycle of non-synchronous rotation, probably because cracking relieves built up stress until further substantial rotation occurs.
www.aas.org /publications/baas/v37n3/dps2005/247.htm   (297 words)

  
 synchronous motor
With a synchronous motor, this will be at a speed slower than synchronous speed and with a non-synchronous motor this will be at a speed slower than the full-load speed.
But it was his synchronous motor that made him the magnate he went on to become.
For applications where the motor's rotation must be kept at a fixed speed, regardless of changes to the load.
www.pavilionone.com /synchronous-motor   (1257 words)

  
 Patrick Phobos Mysteries pages: A to Z.   (Site not responding. Last check: )
A synchronous satellite with an orbital inclination of zero (same plane as the planet's equator) stays fixed in the sky from the perspective of an observer on the planet's surface.
A satellite's rotational period is equal to its orbital period; this causes the same side of a satellite to always face the planet.
Synchronous rotation occurs when a planet's gravity produces a tidal bulge in its satellite.
members.aol.com /pgrsel2/facts.htm   (999 words)

  
 Synchronous motor patent invention
The rotation of the rotor is raised to a state close to synchronous rotation, and at this point, the commutator is mechanically disconnected from the rectifier circuit to switch to synchronous driving of the motor by the AC power supply (see Japanese Laid-Open Patent Publication No. H09-84316 and Japanese Patent Application No. H09-135559).
When the rotational speed of the rotor which is detected by an optical sensor approaches the synchronous rotation speed, a switch for switching the driving switches to a synchronous driving circuit to carry out a transition to synchronous driving.
In such synchronous motors, a bobbin made of insulating resin is fitted into a channel portion of a stator core (a laminated core) and wire is wound around the bobbin as a coil.
www.freshpatents.com /Synchronous-motor-dt20061026ptan20060238059.php   (996 words)

  
 synchronous - Search Results - MSN Encarta
Two basic types of motors are designed to operate on polyphase alternating current, synchronous motors and induction motors.
Synchronous conferencing is the formal term used in science, in particular in computer-mediated communication, collaboration and learning, to describe text chat technologies.
In astronomy, synchronous rotation is a planetological term describing a body orbiting another, where the orbiting body takes as long to rotate on its axis as it does to make one orbit; and therefore...
encarta.msn.com /synchronous.html   (198 words)

  
 [No title]   (Site not responding. Last check: )
] Of a synchronous motor, the condition under which the motor runs at a speed which is directly related to the frequency of the power applied to the motor and is not dependent upon variables.
] The rotation of a planet or satellite whose period is equal to its orbital period.
] The speed of rotation of a magnetic field in a synchronous machine; in revolutions per second, it is equal to twice the frequency of the alternating current in hertz, divided by the number of poles in the machine.
www.accessscience.com /Dictionary/S/S69/DictS69.html   (1450 words)

  
 SHENZHEN SMART MICROMOROR CO., LTD   (Site not responding. Last check: )
For the electrical reversal of the sense of rotation, synchronous motors for single phase AC and with a permanent magnet rotor require at least two stators or stator windings.
In the case of reversing synchronous motors with two stator windings, the current is displaced electrically by 90°from one winding to the other by adding a capacitor to the circuit.
Reversing synchronous motors with three stator windings are directly connected to the three phase supply without a capacitor.
www.smmc-motor.com /ine/art-04-1.htm   (308 words)

  
 The Book of THoTH (Leaves of Wisdom) - Moon
The tidal bulges on Earth, caused by the Moon's gravity, are carried ahead of the apparent position of the Moon by the Earth's rotation, in part because of the friction of the water as it slides over the ocean bottom and into or out of bays and estuaries.
The Moon is in synchronous rotation, meaning that it keeps the same face turned to the Earth at all times.
The plane of the lunar orbit maintains an inclination of 5.145 396° with respect to the ecliptic (the orbital plane of the Earth around the Sun), and the lunar axis of rotation maintains an inclination of 1.5424° with respect to the normal to that same plane.
book-of-thoth.com /thebook/index.php?title=Moon   (1024 words)

  
 Philosophy given or rather
One rotating the synchronous motor maintains the exact number of revolutions at the same frequency of the magnetic alternation field.
These four synchronous (three phase) generators are coupled together by a gearbox and are driven by the main electric motor (not shown in the drawing).
The rotation impulse of the flywheels is compensated by the opposite rotations but the rotation impulse of the central three-phase generator is left over.
www.galactic-server.com /rune/iarapdx2.html   (2917 words)

  
 The Moon...Astroppo.com
Since the Moon's rotational period is exactly the same as its orbital period, we always see the same face of the Moon pointed towards Earth.
As a result of tidal locking, some of the Earth's rotational momentum is gradually being transferred to the Moon's orbital momentum, resulting in the Moon slowly receding from Earth at the rate of approximately 38 mm per year.
The plane of the lunar orbit maintains an inclination of 5.145 396° with respect to the ecliptic (the orbital plane of the Earth), and the lunar axis of rotation maintains an inclination of 1.5424° with respect to the normal to that same plane.
www.astroppo.com /moon.html   (4071 words)

  
 Moon - ExampleProblems.com
The tidal bulges on Earth, caused by the Moon's gravity, are carried ahead of the apparent position of the Moon by the Earth's rotation, in part because of the friction of the water as it slides over the ocean bottom and into or out of bays and estuaries.
The Moon is in synchronous rotation, meaning that it keeps the same face turned to the Earth at all times.
The plane of the lunar orbit maintains an inclination of 5.145 396° with respect to the ecliptic (the orbital plane of the Earth), and the lunar axis of rotation maintains an inclination of 1.5424° with respect to the normal to that same plane.
www.exampleproblems.com /wiki/index.php/Moon   (5208 words)

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