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The Kinetics SVR1-EC speed-regulated,
eddy current clutch field exciter
is a SCR regulated rectifier system
specifically designed for the application
of supplying regulated variable
DC power, via a closed feedback
loop system, to the field coil of
an eddy current clutch adjustable
speed drive. The system speed regulation,
or "slip", of an eddy
current clutch, is controlled by
varying the output voltage of the
SVR1-EC rectifier to the clutch
field. The SVR1-EC, with the feedback
loop closed on a speed signal, will
maintain drive speed regardless
of load conditions, within the rating
and protective trip limits of the
rectifier. The SVR1-EC system makes
use of an external "speed signal"
to provide for regulating clutch
field current to maintain drive
speed proportional to either a local
or remote referencing signal. The
speed feedback signal, generated
externally - commonly from a tachometer
generator, is directly proportional
to drive output speed.
- Kinetics can supply a speed-sensing
tachometers generator, both contact
and non-contact types, as part of
a speed control system if the application
requires.
- Waste water / storm water systems:
across the country, Kinetics has
successfully designed, installed
and commissioned, state-of-the-art
solid-state retro-fit systems for
pumping configurations. A typical
system consisting of two synchronous
motors operating in parallel with
one motor being a fixed speed and
the second being a viable speed
pump by incorporating the use of
an eddy current clutch between the
motor shaft and pump drive shaft.
Proposal & specifications:
Due to the specialized nature of
applications using eddy current
clutches, please contact Kinetics’
factory sales and engineering for
more details on a specific product
design.
Kinetics uniquely qualified:
Reaching back to Kinetics’
origins as an electrical apparatus
service facility, founder in 1939;
during the prime period that eddy
current clutch speed controls systems
were commonly installed, a period
roughly between 1950 to the early
1970’s, Kinetics was a factory
authorized installer and service
facility for Dynamatic Eddy Current
Clutches and Controls. Within Kinetics’
engineer achieves, is a wealth of
product and application knowledge
that we will use to assure a well
managed and engineered modernization
project.
Eddy current clutch defined:
An eddy current clutch (ECC) drive
is a device used to convert constant
speed rotation input into adjustable
speed output. A typical drive consists
of two concentrically rotating members
(input & output) separated by
a small fixed air gap.
For discussion purposes assume
the input member is a drum rotation
at a constant speed, usually driven
by an AC motor. The output rotor
(field member) consists of the coupling
field coil surrounded by magnetic
steel, which is separate from the
input drum by an air gap. When excitation
is applied to the clutch field determines
the amount of the torque transmitted
at any definite rate of slip between
the two rotating members.
With no current in the coil, the
input member will rotate at full
speed with little or no rotation
of the output member. When current
is applied to the coil, the output
shaft picks up speed as the coil
current is increased, until the
output member is rotating at slightly
less than the speed of the input
member. The speed of the output
member never exactly matches the
speed of the input member since
slip is required to generate magnetic
eddy currents and transmit torque.
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