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FAQ and Q/A with DougFAQ
Q/A with Douglas MannMagnet-rotor-magnet-rotor horizontal overlap
----- Original Message -----
From: Douglas
Sent: Monday, December 22, 2003 7:58 PM
Subject: [PES_BMM] Actuator location and rotor simatic
As for the placement of the large rotor magnets, bore the holes at the edge of the rotor with some magnet showing . Make the holes so they can hold the magnets. Bowman's magnets were on the outside of the rotors. His Actuator just cleared the large rotor magnets. I believe that he used Alnico 5 this is very weak compared to any NEO magnet. So we may not get that close before the magnets interact with each other in a bad way. Here is one thing that is important the distance the magnets are from the center of the small rotors. Must be 1/2 the distance the magnets on the large rotor. You can not just move the magnets on the small rotor to space. I will need to talk to Sterling about this. The forces on the small rotors are two times the large in regard to the radius of the rotors, but it is 1/2 the large rotor in regard to the gear ratio , so they are equal. We must keep the forces equal, so all balanced forces, are magnetic not due to leverage. The motor will not work if this is not closely observed. Like if moving the small rotor magnets out to a new place to weaken the magnetic force will increase the leverage this will upset the magnetic balance even if the forces All balance. Also the small rotor magnets need to be behind the large rotor magnets at lest 1/2 dia of the large rotor magnets. This will hide the small rotor's magnets from the Actuator. Douglas
Re: Face to Face magnet alignment
From: <Douglas@mchsi.com>
To: "Sterling D. Allan" <sterlingda@greaterthings.com>
Sent: Sunday, December 21, 2003 5:09 PM
Subject: Re: Fw: Bowman Motor replication
The true face to face may not work because the actuator will see the field of the small rotor. If you place the small rotor at 1/2 or less the face of the large rotor magnet you should be able to hide the fields of the small rotor. Also balance the repelling rotor first for most force. Then offset its forces with the attracting rotor. If there is not rotation then after placing the actuator. Back off the Repelling rotor to less face, rebalance the zero point with the Attracting rotor and place the actuator back in place. Douglas Spacing of Magnets, Diam of Rotors
From: Douglas@mchsi.com
Sent: Sunday, December 21, 2003 4:47 PM
Subject: Re: [PES_BMM] Qustion about up- and down sizing
The best place to start is to pick the size of the large rotor. All other factors will be based on this factor. What I did is print out the end view image of the rotors. Blow it up to full scale, use this as the blueprint. Then figure the rotor spacings, the pinch dia of the gears, and the size of the rotors. Stacking magnets to get to the ratio? I have not done this, but the the Actuator will need to be wider than the steps of the stack. Hay it may work better, it has some of the factor of the TOMI.( This is true off the shelf ) The magnet-s's magnetic field effect zones, should be over lap some if you want the unit to self star at all points. If the magnets are spaced to far apart, on the rotors there will be dead areas where the motor will not be able to self start. It should still run after it is move a little, so the fields can effect each other. Using 1/2" NEOs this should be no problem on an 8" rotor. More magnet can be use that eight we could use 10 magnets on a 9.196721 dia rotor. the timing would be 36 deg not 45. A 8" dia rotor has a 25.1328" diameter, so the magnets will be spaced 3.1416" center to center; the field will be closer than that on a vector. I was going to a use timing belts like is use on car cam shafts. This would help to make a motor base, so the shafts spaces can be changed. Also some one should try the fixed stator idea with no gears or small rotors. I sent Sterling this image he should post it soon. Douglas Q. Distance between repelling v. attracting rods.Eric Vogel says: "The real key must be to find the distance between the repelling and attracting rods so that without the actuator magnet, the rotor can turn as there were no magnets at all. Calculations show that the distance between repelling rods must be 5 times bigger then the distance between attracting rods (with face to face positioning) so finding the right distance is the real key and the most difficult part." Doug's Reply
From: <Douglas@mchsi.com>
To: "Sterling D. Allan" <sterlingda@greaterthings.com>
Sent: Sunday, December 21, 2003 5:00 PM
Subject: Re: Fw: Bowman Motor replication
From: Douglas@mchsi.com
Sent: Monday, December 22, 2003 1:14 PM
Subject: [PES_BMM] Question
Douglas
Page created by Sterling
D. Allan, Dec. 21, 2003 |
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