They were DC motor spikes at causing osclilations 50 Mhz at pickup coil.
H Ucar
------ Original message------From: [email protected]: Sun, Nov 8, 2015
23:10To: [email protected];Cc: Subject:Re: Magnetic levitation experiments
Jones, I noticed high frequency transients on videos scope screens at the
peaks of the traces. I think they are real and may they are electrical
interference of dc motor (this can be ruled out because they could be present
all all videos) or result of mechanical ultrasonic ringing of magnet or a
related to behaviour of Nd magnets when they receive magnetic impulses. I will
investigating it tomorrow. These transients can be clearly seen on video dated
Nov. 7.
H Ucar
------ Original message------From: [email protected]: Sun, Nov 8, 2015
00:54To: [email protected];Cc: Subject:Re: Magnetic levitation experiments
No, it is directly attached to scope having 1 MOhm impededence. OTH, I am
monitoring the current driving the motor. Sometimes current drops up 8% when
floating magnet get stablely spinning on the air compared motor running stand
alone. This not really expected while the extra signifant vibration caused by
floating magnet interaction. This vibration would normally cause stress on
rotor and would increase the friction. For example 63 mA to 57 mA at 25 V.
H Ucar
Jones Beene Sat, 07 Nov 2015 13:45:47 -0800With the pickup coil attached to a
load - is there any indication of the ratio of P-out to P-in ?
------ Original message------From: [email protected]: Sat, Nov 7, 2015
20:23To: [email protected];Cc: Subject: Re: Magnetic levitation experiments
I added new videos to my playlist.There are scope screens showing 1/2 and
1/3 speed ratio between base magnet and floating magnet. 1/2 ratio corresponds
to single cusped and 1/3 to two cusped epicycloid laser reflection patterns.
https://www.youtube.com/playlist?list=PL3KwdWTgl7fisd3h_tK1YLhFeuzkPATNt
H Ucar
