the fundamental function of Gears is to shift mechanical energy from one rotational speed and
torque to another because gear engagement involves inevitable physical contact this produces tooth
surface wear or tooth injury therefore gears require regular lubrication and occasional
maintenance when thinking of Gears that transmit torque without contact think magnetic gears these
great gears do not require lubrication do not suffer from wear or debris generation and might
give exceptionally stable performance over an extended lifespan a gear with these fantastic
features should be on the lips of everyone interested in Gears still surprisingly this
is not so with Magnetic gears it is well known that mechanical gears are incredibly dependable
and these Drive systems can reach extremely high torques nonetheless they have certain intrinsic
flaws in this video we reveal why nobody is talking about magnetic gears sit with us until
the end of this video and you will decide whether magnetic gears are for you let's get started
magnetic gears are remarkably similar to ordinary mechanical gears in terms of the fundamental
operating principle geometry and function physical contact gear engagement in mechanical gears is
replaced by magnetic engagement in these gears which is supplied by a magnetic Source such as
a permanent or electromagnet this High Magnet interaction concentric magnetic gearbox is one
of the most prevalent instances of this technology magnetic gears aren't very well known and are only
used in a few Niche applications still they are becoming increasingly popular and are one
of the best ways to transfer mechanical energy by changing torque and RPM you'll probably find them
somewhere so let's find out what they are and what they can do what are magnetic gears instead of
using mating surfaces of mechanically interlocking teeth to transmit torque magnetic gears use
automating magnetic fields magnetic gears have always played A Modest part in engineering they're
relatively high price which directly reflects their Reliance on Rare Earth such as complex
assemblies neodymium and susceptibility to slip at high torques have not precisely propelled them to
the Forefront of the industry the maximum torque density of magnetic gears is significantly lower
than that of their mechanical equivalence however if their rated torque is surpassed magnetic gears
do not sustain irreversible damage expanding the torque of magnetic gears is currently the focus
of numerous research programs and they are making their way into increasing applications due to the
absence of mechanical interlocking and physical contact between the rotors magnetic gears are not
prone to Mechanical wear most conventional gear types including Cog wheels and worm gears can be
recreated as magnetic gears by substituting the cut teeth with the alternating magnetic
poles of permanent magnets however magnetic gear typically refers to a coaxial kind with
significantly Superior performance in industrial applications it is mechanically similar to a
strain wave gear and permits high gear ratios and comparable torque instead of a flexible
spline this sort of gear utilizes the flexibility of the magnetic field at full load torque density
is comparable to Mechanical gears can be achieved with efficiencies of 99 or greater in part load
conditions significantly higher efficiencies can be achieved than with mechanical gears in
addition with greater power ratings magnetic gear can be smaller lighter and less expensive
how do magnetic gears work the magnetic gear design consists of three concentric rotors and
resembles mechanical planetary gear sets in many ways the inner and outer rotors include permanent
magnets and service summon ring years respectively a flux modulator that functions as a planet gear
is positioned between them it is well known that a permanent magnet contains two poles north and
south and that poles with the same polarity repel each other whereas poles with opposite polarities
attract when the Sun Gear takes a short step and aligns with the next Iron segment in the
modulator it attracts the South Pole on the ring here toward itself while simultaneously fixing
the adjacent North Pole these forces generate a tangential force in this direction which rotates
the ring gear the inner and outer rings are constructed from powerful permanent magnets
the gear ratio is determined by the number of pole pairs in the inner and outer rings and the
number of iron components due to the small air gap between each ring friction cannot be accounted for
the modulator ring May operate as a stator or be directly linked to the output shaft with
the outer magnet ring as the stator as the motor rotates the force will build but just after the
peak the magnets will no longer be able to retain each other and the link between the magnets will
break normally noticeable damage would occur at this point in mechanical gears but there
is no damage in the magnetic gear instead the magnets simply slip over each other and jump to
the next magnet the magnets then interact again and the force Rises to the maximum level they
can withstand still they reach their limit and slip again this is why oscillations are observed
and these variations also indicate that magnetic gears have inherent over torque protection what
are these magnetic gears good for No Doubt magnetic gears can be very efficient have
a very low torque Ripple and require almost no maintenance they can be used anywhere efficiency
low torque Ripple and little or no maintenance costs are important interestingly the magnetic
Gear's efficiency is between 99 and 100 at low speeds magnetic gears are interesting because
they have a high gear ratio this makes them good for stepping up very slow input forces
wind turbines are also interested in magnetic gears because they have the same benefits
early this year a TB Lawrence scotlet magnematics and Rolls-Royce said they would work together they
said their collaboration would produce a ship propulsion system that uses magnetic gears in
Marine propulsion magnetic gears change the high RPM from an engine to the low RPM and high torque
needed for the propeller shaft magnetic gears are also useful in a lab and medical settings
because they can seal the input and output forces so well that air can't get in or out
if magnetic gears are this fascinating and near perfect why is nobody talking about them evidently
magnetic gears also have downsides as previously stated the maximum torque may not be sufficient
for some applications and these gears are often more expensive and heavier than standard gears
in addition at extremely high RPM they lose their efficiency Advantage due to higher losses brought
on by histories and increased Eddy currents in the modulator nevertheless ongoing research
is gradually removing the majority of these restrictions cmr's programmable magnets allow for
powerful finely spaced magnetic structures which may in the future enable smaller more efficient
magnetic gears with increased torque density Additionally the need for Gears is evolving
in industrial applications greater torque may always be preferable still interactive robotic
applications necessitate mechanisms that yield to assure the safety of human users magnetic
gears can also be manufactured without the need for cumbersome gear cutting machines making them
particularly appealing for do-it-yourself projects numerous permanent magnets readily
accessible hardware and 3D printed components might be used to create a decent concentric
magnetic gear that's it on magnetic gears why is nobody talking about this how do you feel
about using magnetic gear in a project did you use magnetic gears for something not listed here tell
us what you think and share it in the comments section if this video is insightful please go on
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