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Product Information
Automatic balancing A cost efficient way of solving unbalance
problems
Applying the technology with automatic balancingopens up a path
of solving unbalance problemsby continuously balancing your
machine. In thisway noise and vibrations are reduced, expectedtime
of life increased and manufacturing costdecreased.
An automatic balancer is fitted on the rotatingshaft, which
contains freely movable balls.The balls will then position
themselves in sucha way that they compensates for variations
inunbalances within a fraction of a second.
Swerea IVF offers the complete chain in thetechnology of
automatic balancing from con-cept studies with computer simulations
overdesigning prototypes and all the way to deliveringcustom
tailored automatic balancers.
Typical applications: Grinding machines Washing machines
Propellers Centrifuges Separators
Pumps CD and DVD players Etc
BenefitsSuitable applications for the technology are wherethe
unbalance in the machine varies or where it isimpossible or to
costly to rebalance after everychange of the unbalance.
Good examples are the grinding disc of a grinder,the laundry in
a washing machine, fans or anymachine where the unbalance are
changed afterservice or when the balancing in production arecostly
in the manufacturing. Automatic balancinggives several advantages:
Less vibrations Less noise and especially structure born noise
Longer expected time of life Extended time between maintenance
Simplified design of machine supports Reduced manufacturing costs
due to that the
balancing procedure could be simplified oravoided and also due
to that the machine doesnot need to be designed to withstand
highunbalance forces.
Swerea IVF AB P O Box 104 Argongatan 30SE-431 22 Mlndal SE-431
53 MlndalSweden Swedenwww.swereaivf.se
ContactHans Lindell, Phone +46 (0)31-706 60
[email protected]
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The technologyThe principle is working for machines that are
runningabove the supercritical speed, which almost
all machines do or can be modified to do. In orderto fulfill
this demand there needs to be a weaknessbetween the rotating
unbalance and the surroun-dings.
A very common misunderstanding is that it is onlymachines with
slender shafts that run supercriticalbut this is certainly not the
case. The weakness canconsist of the human arm that are holding a
hand heldgrinder or the rubber feet that a fan is standing on.
The principle is just as simple as it is ingenious.In its
simplest execution two balls are placed in a
circular enclosure. The ring is centered on the shaftthat is
going to be balanced. The center of the ringis marked with a square
in the graph. When themachine is rotating supercritical the center
will striveto rotate around its center of mass marked withan X. By
adding two balls to the ring the resulting force ofthe normal force
and the centrifugal force will movethe balls away from the center
of mass. The balls willexperience a downward slope and will start
rolling.At the same time the center of mass will follow theballs
toward the center of the ring since the balls are
a part of the total mass.In stage 3 the center of mass coincides
with thecenter of the ring and the machine is well balanced.The
balls do not experience any downward slopesince the centrifugal and
normal force cancels eachother.
