The MintakaFulcrum

Mk 5.13

Feb. 2004

Building Instructions, Photos, and Schematics

New Motor Configuration with sixteen stator coils. February 10th 2004.

Experiment for re-using the back emf from the 8 primary coils into the 8 secondary coils .

• New Motor Configuration.
  
  
  • New rotot build for this model.
  • Rotor is 6" in diameter
  • It uses 4 grade 28 Neodymium magnets spaced ninety degrees apart.
  • Made with a 1/2 inch thick, 5 and 1/2 inch diameter steel plate in the rotor.
  • All the magenets are north poles facing out like the previuos rotor.
  • The primary coils are reused from the previous motor
  • The secondary coils are wound with 24 guage magnet wire to ~15 ohms.
  • It uses 2 banks of 4 coils that are wired in series @ ~60 ohms for each circuit.
  • Four switches are used in this model
  • Each of the two secondary capacitor banks are made from 5-40 Volt, 100,000 microfarad capacitors wired in series for a maximum of 200 Volts at 20,000 micro farads.
  • Maxium input voltage so far is 48 volts @ ~ 4 amps for ~200 watts.

Motor Circuit Details

• How this circuit works.
  
  
  • The operation of this model is the same as previous models in that the primary swithing is aternating between the two primary circuits.
  • The sixteen coils are broken up into four banks of four couls each.
  • The two primary banks are powerd from from the batterie.
  • The inductive back emf spike is shunted to each capaciter bank.
  • These in turn charge up and supply power to the secondary coils.
  • Each bank of secondary coils are fired between the primary pulses.

Switch Details

• Four Transisters are used for switching the coils on and off in this model.
  
  
  • Transisors are NTE 36 npn, 120V 12-15 amp.
  • Transitors are turned on and off by the reed switches.
  • Two switches are used for secondary circuit and two for thte primary set of coils
  • .

Rotor Construction Details

This version has a new rotor with very powerful Neodymium Magnets. The old rotor is on the left.
Details of new rotor constructed. Right picture is a comparison to the old rotor.

• Timing disk made larger for better switching reliability.
  
  
  • The steal "keeper" plate is just under 5 -1/2"
  • The magenets are 1/2" thick giving an overall diameter of 6 inches for theis rotor.
  • The mass of the rotor : ~5 kg.

Stator Construction Details - See Mk 3.0

Assembly Details - See Mk 5.0

Primary Timing Disk Details- See Mk 5.0

Secondary Timing Disk Details

• The duty for one rotation(1*pi*d) I would saftely estemate about 35-40% duty, times 2 oscilating circuits. So coils will be on for 70-80% of rotor rotation leaving 20-30% of the rotation off. But the secondary is firing between the two primaries at I guess 10-15% duty. So rotor only has no power to it for only 5-10% of rotation while there is power for the other 90-95% and only uses ~7-9 watts but can draw a maxium of ~4 amps times 12 Volts for ~48 watts ( I compared a small 45 watt AC fan for torque and this motor was comparable!). Remember that only one circuit can be on at a time in this configuration, so this gives the max electrical power input for the machine. Unless you charge up the recapture cap and use that circuit. then you have 100 volts divided by 54 ohms for 1.86 amp(peak), for a total of 186 watt peak( I have had it as high as 120).... I have to add the other 4 coils to get the thing back into a more omni-symetrical magnetic arangement as I think it will perform better then... I will have to replace primary switches to use more voltage to run motor too.

• Test Results
  
  
  • So far draws ~2 amps per battery at ~48 Volts for approx. 200 watts input electrical power
  • rpm=1,200.
  • Primary stators(coils), caps, and switches each run at a 3 - 4 degrees celcius above ambient.

• Discoveries
  
  

• Conclusions
  
  

CAUTION: The information here is for educational purposes only. Any attempt at replication is done at full liability of the one replicating it. These motors can develop high rpm and high voltage depending on how they are designed. Build and operate at you own risk!

email me: motorlab@shaw.ca

For the copy-right/claim© 2001-5 by: Ian Coke-Richards and The MintakaFulcrum and may be freely distributed with due respect. Not for commercial purposes without permission and licence from the author. All commercial uses are subject to the terms of the user licence.