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This test was inspired by the demo at the Searl company: https://www.youtube.com/watch?v=J9Orz...
The copper tube is a 3/4 inch "M" water pipe (.80 ID before rework) that was split open and trimmed and then reformed into a smaller diameter and soldered back together to clamp up the diagonally magnetized 3/4 inch OD x 3/4 inch long x 1/4" ID neo magnet. the copper tube is 2 1/4 inch long and magnet is located in the center of this copper tube.
the motor that powers this rotor was a 19,000 rpm motor. This motor needs to run at least 11 volts dc at 5-8 amps to make the rotor spin and float due to the magnetic drag from the ceramic magnet below. This motor was bought from www.robotshop.com
Parts bought at www.robotshop.com I will now list.
The 15 tooth pulley is part number RB-FTR-23 (S3M 15 tooth pulley). Aluminum.
the RB-FTR-31 is a (S3M 42 tooth timing pulley). Aluminum.
the RB-FTR-36 is a (85 tooth timing belt)
Here is a 19,000 rpm motor product code: RB-Wtc-03
Powerful Mabuchi RS-550 DC Motor, 77A stall current, 6 to 14.4V input range (12V nominal)
RS-540 12V 16800 RPM 39.48 oz-in Brushed DC Motor should also work (from robot.com)
Product Code : RB-Ban-68
The bearings we used were RB-Sct-836
1.4" ID x 1/2" OD
Neodymium Magnets N45 OD 3/4"XID1/4"X3/4" NdFeB Rare Earth Magnet used inside the .80 ID copper water "M" water pipe.
Magnetization Direction: Diametrical; These rings are diametrically magnetized, which means they are magnetized perpendicular to the axis of the hole. The poles are located on opposite sides of the circular faces.
1/4 inch aluminum rod: http://www.amazon.com/TEMCo-Diameter-Aluminum-Round-Lathe/dp/B011A07D0I/ref=sr_1_1?ie=UTF8&qid=1456942499&sr=8-1&keywords=1%2F4+inch+aluminum+rod
The drive shaft was made from 1/4" aluminum rod. DO NOT USE STEEL.
The wood carriage was made from hardwood 3/4" x 3/4" x 8" long. the cross bars made from the same wood were 2.7" long and glued and screwed to the two cross members that held the motor mount and bearing blocks.
the bearing blocks were made from 1/2" x 3/4" aluminum angles .06 thick. the bearings were Super glued into the angles.
The angles that held the wood carriage to the magnet were made from STEEL. We still had to clamp up these steel angles to the ceramic magnet because the magnet was not strong enough to hold these steel angles in place just due to the fact they were steel. Various holes were drilled into the wood carriage to allow the steel angles to pivot the wood carriage above the magnet at its proper center of gravity. the rotor assembly must fall on the magnet without the rotor turning. if the rotor is turned to the same polarity as the ceramic magnet below then the rotor should float above the magnet without the rotor turning. That is how I determined the proper center of gravity.
Changed the center of gravity so that when the rotor is stopped and the polarity of both magnets are the same the carriage would no longer float. The spinning rotor would still lift off the rotor but at top speed at 13-14 vdc.
Checked voltage from rotor to earth ground while running and read 1-2 vac. frequency was 60-155 Hz.
155 Hz times 60 seconds per minute equals 9300 divided by 2 pole magnet = 4650 RPM rotor speed.
Wound a 60 turn # 23 magnet wire coil around the 3/4" part of the magnet and took voltage readings between coil and copper plate and earth ground. No voltage over 2 VAC recorded but the coil produced a clean sinewave at 120-155 Hz.
Ceramic Magnet C8 6X4X3/4" Hard Ferrite Magnet Block
The location of the rotor is critical in relationship to the ceramic magnet location. We located the rotor magnet approx. in the center of the ceramic magnet. It did not work when the rotor magnet was too close to the edges of the ceramic magnet.
Attempted to use the side of the 4 x 6 x 3/4 ceramic magnet without the copper plate to see if in fact there are eddy currents creating magnetic fields that push up the rotating drum and we could not get the drum to float. It only dropped when the motor carriage was released to gravity / anti-gravity forces with motor running at full power.
Who is John Searl?