Anthony Villanacci Posted April 13, 2023 Posted April 13, 2023 1 hour ago, Jim Kovar said:This would ensure perfect spacing between the cores and make for a more rigid assemblage. Yeah, that rigidity especially being important since it looks like that whole assembly spins. Am I correct in interpreting that the output of the two opposing fans spins the entire assembly to drive the larger blade? A very whimsical approach to solving a problem 😂 Quote
Jim Kovar Posted April 13, 2023 Posted April 13, 2023 (edited) 21 minutes ago, Anthony Villanacci said: Am I correct in interpreting that the output of the two opposing fans spins the entire assembly to drive the larger blade? A very whimsical approach... That's the way I see it. Whimsical, for sure! I wonder how fast Ketcher intended the CF version to spin? Edited April 13, 2023 by Jim Kovar Quote
Louis Luu Posted April 14, 2023 Author Posted April 14, 2023 8 hours ago, Jim Kovar said: Anthony, I think you are dead on. I especially dig and totally agree with your spacer bracket revision. This would ensure perfect spacing between the cores and make for a more rigid assemblage. Agree! Quote
Louis Luu Posted April 14, 2023 Author Posted April 14, 2023 I will have to remember to make the oiler point upward perpendicular to the motor. Quote
Jim Kovar Posted April 14, 2023 Posted April 14, 2023 Hi, Louis. There'll need to be gaps. A closed conductive loop around the magnetic circuit's cross section would be like a short circuit on a tranformer core. Not good! Yeah, yeah,... the motor will be powered with DC. No problem,... right? Wrong! Rectified DC, which I assume you'll using, whether half-wave or full still has a major AC component (ripple). 1 Quote
Louis Luu Posted April 14, 2023 Author Posted April 14, 2023 2 minutes ago, Jim Kovar said: Hi, Louis. There'll need to be gaps. A closed conductive loop around the magnetic circuit's cross section would be like a short circuit on a tranformer core. Not good! Yeah, yeah,... the motor will be powered with DC. No problem,... right? Wrong! Rectified DC, which I assume you'll using, whether half-wave or full still has a major AC component (ripple). Thank you for catching my mistakes....that is easy to fix. Quote
Jim Kovar Posted April 14, 2023 Posted April 14, 2023 (edited) 40 minutes ago, Jim Kovar said: A closed conductive loop around the magnetic circuit's cross section would be like a short circuit on a tranformer core. Not good! Well not nessessarily bad in all situations... Of course I'm referring to shading coils which cause magnetic flux to sweep across the motor poles or to prevent the keeper (armature) of AC coil relays from chattering and prevent the possibility of relay drop-out. Edited April 14, 2023 by Jim Kovar Quote
Jim Kovar Posted April 14, 2023 Posted April 14, 2023 (edited) Gapped all the way to the core, i.e. separate pieces. Edited April 14, 2023 by Jim Kovar 1 Quote
Louis Luu Posted April 14, 2023 Author Posted April 14, 2023 (edited) 10 minutes ago, Jim Kovar said: Gapped all the way to the core, i.e. separate pieces. Edited April 14, 2023 by Louis Luu Quote
Louis Luu Posted April 14, 2023 Author Posted April 14, 2023 8 hours ago, Jim Kovar said: Gapped all the way to the core, i.e. separate pieces. I will make some plastic shims around the core and the brass piece. Quote
Louis Luu Posted April 14, 2023 Author Posted April 14, 2023 (edited) My physics buddy said the iron core and endbell can be hollowed out and still induce a magnetic field. I'm thinking of going down this route to reduce the cost and offset the weight on the pivot during rotation. Jim...is this route possible? I'm referring to this piece. I plan on hollowing the entire piece out with enough thickness to maintain printing integrity. Ignore the color, this thing will be fused together as one piece with the inside hollowed. Edited April 14, 2023 by Louis Luu Quote
Louis Luu Posted April 15, 2023 Author Posted April 15, 2023 Draft. The wing span for the ceiling is 10 inches and the motor blade is 6 inches. I still need to draw the stator and blade hub Quote
Louis Luu Posted April 19, 2023 Author Posted April 19, 2023 Smoothed out the rotor. Just need the brush holder and blade hub. Then I will begin the process of hollowing out the core for printing. Quote
Jim Kovar Posted April 19, 2023 Posted April 19, 2023 On 4/14/2023 at 8:50 AM, Louis Luu said: My physics buddy said the iron core and endbell can be hollowed out and still induce a magnetic field. I'm thinking of going down this route to reduce the cost and offset the weight on the pivot during rotation. Jim...is this route possible? I'm referring to this piece. I plan on hollowing the entire piece out with enough thickness to maintain printing integrity. Ignore the color, this thing will be fused together as one piece with the inside hollowed. The hollowing out of the core would be counterproductive and detrimental. Quote
Louis Luu Posted April 19, 2023 Author Posted April 19, 2023 (edited) On 4/19/2023 at 8:03 AM, Jim Kovar said: The hollowing out of the core would be counterproductive and detrimental. Can you explain wise wizard? I would appreciate it if you can help with the wiring diagram if doable. Edited April 22, 2023 by Louis Luu Quote
Louis Luu Posted April 19, 2023 Author Posted April 19, 2023 Just need to draw the brush holders and put in some holes on the base to hold the stem. Quote
Louis Luu Posted April 22, 2023 Author Posted April 22, 2023 This part is done. All smoothed out with hole placements. Quote
Louis Luu Posted April 23, 2023 Author Posted April 23, 2023 Top Bracket without the ceiling attachment done. Quote
Louis Luu Posted April 23, 2023 Author Posted April 23, 2023 (edited) Bottom bracket done. Edited April 23, 2023 by Louis Luu Quote
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