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Date: Sun, 24 Mar 2013 16:58:04 -0400
Message-ID: <CALSZ9goKGHmjNsw0K1P_DNWX=3bbUhff=wAgJzUEjRtxAnDKaA@mail.gmail.com>
Subject: [geda-user] Magnetic Exercise Bike design with a stator and rotor
From: Rob Butts <r DOT butts2 AT gmail DOT com>
To: geda-user AT delorie DOT com
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Reply-To: geda-user AT delorie DOT com

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I've been wrestling with designing a magneticly resistanced exercise arm
bike and have been trying to simulate the same system used for a road
bycicle magnetic resistance trainer I have.  It incorporates two
plastic discs with six 3/4" diameter disc magnets evenly spaced and mounted
around the perimeter of the plastic discs.  These discs are mounted on
either side of an aluminum wheel which spins and is attached to a roller
that the back tire of the road bycicle rests on.  One plastic disc is fixed
and the opposing plastic disk is allowed to rotate 30 degrees providing the
variable magnetic field and variable resistance.  I have not been able to
simulate the resistance I believe because I'm not providing the same
rotational velocity of the aluminum disc.

The whole theory is based on eddy current brakes.  After rereading the wiki
site on eddy current brakes, specifically the Telma retarder which led me
to retarders I am thinking that I can use a cheap rotor and flywheel for a
moped alternator/generator found at this link.

http://www.ebay.com/itm/STATOR-MAGNETO-W-FLYWHEEL-ALTERNATOR-GENERATOR-ROTOR-8-COIL-GY6-SCOOTER-MOPED-/121055417724#vi-content

It is an 8 coil 4-wire stator with the matching flywheel.  It appears the
shaft goes through the flywheel spinning it and the stator is secured from
rotating (as the retarder is defined).  I'm not sure yet as I don't have a
schematic of the stator and therefore don't know how the wiring would work
but my thought is that as someone spins the shaft, the more power you apply
to the stator the more resistance is experienced by the person spinning the
shaft (the bike handles).

Am I thinking correctly?

Thanks for opinions and thoughts!

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<div>I&#39;ve been wrestling with designing a magneticly resistanced exerci=
se arm bike and have been trying to simulate the same system used for a roa=
d bycicle magnetic resistance trainer I have.=A0=A0It incorporates=A0two pl=
astic=A0discs with six 3/4&quot; diameter=A0disc magnets evenly spaced and=
=A0mounted around the perimeter of the plastic=A0discs.=A0 These discs are =
mounted on either side of an aluminum wheel which spins and is attached to =
a roller that the back tire of the road bycicle rests on.=A0 One plastic di=
sc is fixed and the opposing plastic disk is allowed to rotate 30 degrees p=
roviding the variable magnetic field and variable resistance.=A0 I have not=
 been able to simulate the resistance I believe because I&#39;m not providi=
ng the same rotational velocity of the aluminum disc.</div>
<div>=A0</div><div>The whole theory is based on eddy current brakes.=A0 Aft=
er rereading the wiki site on eddy current brakes, specifically the Telma r=
etarder which led me to retarders I am thinking that I can use a cheap roto=
r and flywheel for a moped alternator/generator found at this link.</div>
<div>=A0</div><div><a href=3D"http://www.ebay.com/itm/STATOR-MAGNETO-W-FLYW=
HEEL-ALTERNATOR-GENERATOR-ROTOR-8-COIL-GY6-SCOOTER-MOPED-/121055417724#vi-c=
ontent">http://www.ebay.com/itm/STATOR-MAGNETO-W-FLYWHEEL-ALTERNATOR-GENERA=
TOR-ROTOR-8-COIL-GY6-SCOOTER-MOPED-/121055417724#vi-content</a></div>
<div>=A0</div><div>It is an 8 coil 4-wire stator with=A0the matching flywhe=
el.=A0 It appears the shaft goes through the flywheel spinning it and the s=
tator is secured from rotating (as the retarder is defined).=A0 I&#39;m not=
 sure yet as I don&#39;t have a schematic of the stator and therefore don&#=
39;t know how the wiring would work but my thought is that as someone spins=
 the shaft, the more power you apply to the stator the more resistance is e=
xperienced by the person spinning the shaft (the bike handles).</div>
<div>=A0</div><div>Am I thinking correctly?</div><div>=A0</div><div>Thanks =
for opinions and thoughts!</div>

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