The following is some info I dredged up for an associate and I thought
it should be passed to the list..it is of course in reference to the
comments by Steven Sullivan on their Omnidyne toroid based motor which
he says uses toroids to produce overunity.
Here is the contact for Omnidyne - Steven Sullivan - 007@tampabay.rr.com
I've not seen anyone ask or reply to those questions which are;
1) what is a slotless, brushless, DC motor?
click on slotless, brushless DC motor, they patented it;
An ELINCO slotless brushless DC motor consists basically, of a stator
winding positioned inside laminated stator ring (without conventional
teeth) and a permanent magnet rotor. This provides more peripheral
space for the copper winding which now can occupy a narrower annulus.
This also allows space for a larger rotor diameter with more magnet
surface area and more air gap flux. Powerful rare earth magnets provide
high torque to motor weight ratios, also lowering frame envelope sizes.
This absence of stator slots eliminates tooth iron losses at high speeds
improving motor efficiency, reducing magnetic noise, and eliminating
torque cogging at all speeds.
Basic frame size diameters of from 1.4" to 5.8" provide for a variety of
custom designs up to 10 HP, for voltages of 12V up to 750V, and speeds
to over 100,000 RPM depending upon the application, duty cycle, and
driver controller.
APPLICATIONS
In products such as ELECTRIC NUT RUNNERS, the ELINCO slotless brushless
(cogless and audibly quiet) DC motor design provides uniformly
predictable torque run-down and stopping, to within 5 msec of torque
sensor signal activation, without torque scatter, enabling the
repeatedly accurate assembly of critical joints.
In a HIGH DENSITY TAPE DRIVE, an ELINCO slotless BLDC motor, with less
than 5% dynamic torque ripple and no static torque cogging, provides for
very fast and accurate positioning of the optical tape to within
microns, effectively speeding up read/write capabilities and enabling
the storage capacity of over one thousand Gigabytes.
A WINDMACHINE fan, designed to create maximum air-flow with minimum
noise for theatrical stage and motion picture productions, uses an
ELINCO SBLDC motor to provide very smooth, audibly quiet operation to
simulate the pure wind effects from a light zephyr to a stiff breeze.
A precision AIR BEARING ROTARY TABLE relies on an ELINCO slotless
brushless DC motor rotor/stator set with 72 poles to enable jitter-free,
accurate positioning and rotation down to as slow as 1/4 revolution per
hour with up to 20 ft.-lb. torque without gearing.
Other applications include high speed and precision grinding and
finishing spindles, precision laser scanners and ultra high speed
centrifuges.
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engineering description from another manufacturer;
http://www.koford.com/page5.html
KOFORD 1.4" (36mm) Slotless Brushless DC motor.
ENGINEERING
·Maximum rpm 30,000 ·Maximum Stall torque 134 oz-in.
Slotless design is cog free, cost effective, and provides high
efficiency and cool operation at high speed. Available with optical
encoders and gearheads. 125°C rated Neo rare earth magnets standard.
....For severe environment and best life in non sealed units under
autoclave environment samarium cobalt magnets are optional Advanced
motor design and material allows high power density with 2 pole magnet
design greatly reducing heating at high rpm.
Available with hall leads for positioning and reversing applications and
sensorless for use with or for use sensorless drives, with encoder
controlled commutation or use as a generator. These motors exhibit
exceptionally smoothness when driven by encoder controlled sinusoidal
drives.
Custom versions available including super high power density designs
with toothed rotors and 6 pole magnets resulting in 4x torque at
given rpm (Km 10), hollow stainless shafts for medical tools, integral
electronic units with sensorless drives for use in pumps blowers and
hall effect integral electronic units for high performance applications
available. Consult factory.
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this one comes with a toroid winding, interesting this company Jackson,
claims several MAJOR companies infringed on their patented designs!;
http://www.geocities.com/ResearchTriangle/Thinktank/4347/Motors/motors.html
Aliases:
Slotless
Toothless
Toroid Winding
Wide Air Gap
Companies that Infringed:
BEI
Clifton
ELINCO
General Electric
Ketema
Kodak
Kollmorgen
Litton
Pittman
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the second question was;
2) how to make a toroid winding?
video clip of how a 100 turn, 16AWG wire toroid is wound;
http://www.gormanmachine.com/920bvid.html
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toroid diagram with variations;
http://www.midcoast.com/~bo/TetMold.html
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Toroid winding machines;
http://www.interviz.com/Files4/WeyHang.htm
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very reasonable toroid coil experimenter kits;
http://www.bytemark.com/amidon/kit_tor1.htm
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toroid cavities as NMR detectors;
http://pcgate.thch.uni-bonn.de/pc/torus/torus_basics.html
Toroid coils (Fig. 1) are inductors that confine the electromagnetic
field of currents to the inner regions of the coils.
....For high-pressure NMR investigations, the use of toroid coils can be
advantageous over the use of standard solenoid or Helmholtz saddle
coils.
The intrinsic high inductance (L) of toroid coils limits its use to
lower NMR resonance frequencies (f): f ~ L -1/2 .
....Fig. 2 Toroid Cavity adapted from a toroid coil of many
parallel-wound single-turn coils
The inductance of toroid coils is reduced if the turns are wound in
parallel. The area of the confined electromagnetic field, however,
remains the same.
A toroid cavity (Fig. 2) is derived from unifying many parallel-wound
turns of a toroid coil to form a coaxial resonator.
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toroid design sample for 1.88 Teslas;
http://www.physics.carleton.ca/courses/75.364/mp-1html/node5.html
toroid design applet;
http://www.fix.net/jparker/tools/toroiddesign.htm
-- Jerry Wayne Decker / jdecker@keelynet.com http://keelynet.com / "From an Art to a Science" Voice : (214) 324-8741 / FAX : (214) 324-3501 KeelyNet - PO BOX 870716 - Mesquite - Republic of Texas - 75187