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Likkewaan
08-25-2008, 07:16 PM
Hi guys

hope im in the correct forum. im an student engineer and currently busy with my final year project.

For my project im using to rc motors with fans to balance an upright pendulum.

for the simulation i need to know wht the internal inductance of the motors are. can anyone help please: im currently looking at the Axi 2208/20 motor. oh and i have to know the inductance before i can order or get the motor.

please can anyone help:)

CHELLIE
08-26-2008, 10:17 AM
Hi guys

hope im in the correct forum. im an student engineer and currently busy with my final year project.

For my project im using to rc motors with fans to balance an upright pendulum.

for the simulation i need to know wht the internal inductance of the motors are. can anyone help please: im currently looking at the Axi 2208/20 motor. oh and i have to know the inductance before i can order or get the motor.

please can anyone help:)

Maybe this might be of some help. internal resistance 89 mohm<TABLE class=speclistsm><TBODY><TR><TH></TH><TD align=middle></TD></TR></TBODY></TABLE>

AXI 2208/20 Brushless Electric Motor

You will be surprised by the very high power delivered by these small and very robust, but light weight (45g with power cables) brushless motors with rotating case suitable for all models of 300-400 size, and microhelicopters. The hardened steel 3,17mm diameter shaft is supported by two large ball bearings which ensure very good mechanical reliability with front or radial mounting. As a result of using the latest ferromagnetic materials the AXI GOLD 22xx/xx Line motors offer extremely high efficiency and high load capability for their weight. AXI GOLD Line with the high quality of manufacturing, reliability and performance are the best outrunners available in the market. A feature of the AXI design is provision for radial mounting. The optional radial mount set includes: mounting plate, propeller adapter, securing collar, and screws.
<TABLE class=speclistsm><TBODY><TR><TH>Specifications</TH><TD align=middle>AXI2208/20</TD><TD rowSpan=13>http://www.chiefaircraft.com/Models/ElectricAirplanes/Motors/Images/AXI_2208-20.jpg</TD></TR><TR><TH>Cells</TH><TD align=middle>6-8
2-3 x Li-Poly


</TD></TR><TR><TH>RPM per Volt</TH><TD align=middle>1820 RPM/V</TD></TR><TR><TH>Max. Efficiency</TH><TD align=middle>82%</TD></TR><TR><TH>Max. Efficiency Current</TH><TD align=middle>8-12A (<74%)</TD></TR><TR><TH>No load current /8V</TH><TD align=middle>0,8 A</TD></TR><TR><TH>Max. Loading</TH><TD align=middle>16 A/60 s</TD></TR><TR><TH>Internal resistance</TH><TD align=middle>89 mohm</TD></TR><TR><TH>Dimensions</TH><TD align=middle>27,7x26 mm</TD></TR><TR><TH>Shaft Diameter</TH><TD align=middle>3,17 mm</TD></TR><TR><TH>Weight with power wires</TH><TD align=middle>45 g</TD></TR><TR><TH>Recommended model weight</TH><TD align=middle>270-340 g</TD></TR><TR><TH>Propeller range. Direct drive.</TH><TD align=middle>2xLi 7.5-8x4"</TD></TR></TBODY></TABLE><TABLE class=partlist><COLGROUP><COL class=partcol><COL class=photocol><COL class=desccol><COL class=addcol><COL class=pricecol></COLGROUP><TBODY><TR><TH noWrap>Part No.</TH><TH>PHOTO</TH><TH>Description</TH><TH>CART</TH><TH>Price</TH></TR><TR><TD noWrap>AXI 2208-20</TD><TD></TD><TD>Motor Brushless Sensorless Electric 2208/20, AXI</TD></TR></TBODY></TABLE>

CHELLIE
08-26-2008, 10:18 AM
here is the link to the page
http://www.chiefaircraft.com/rcmsec/Models/ElectricAirplanes/Motors/AXIMotors-2208.html

Likkewaan
08-26-2008, 10:23 AM
Thnx for replying, i have that site and everything, but none of them give the internal inductance , only internal resistance:)

CHELLIE
08-26-2008, 11:11 AM
lets see if i can find the MFG contact info

CHELLIE
08-26-2008, 11:23 AM
contact the mfg. they should be able to help you. hope that helps, Chellie

<TABLE cellSpacing=0 cellPadding=0 width="98%" align=center border=0><TBODY><TR><TD vAlign=bottom width=22>http://www3.towerhobbies.com/images/mfr_info_left.gif</TD><TD class=mfn_line>http://www3.towerhobbies.com/images/contact_information.gif</TD><TD vAlign=bottom align=right width=27>http://www3.towerhobbies.com/images/mfr_info_right.gif</TD></TR></TBODY></TABLE><TABLE cellSpacing=0 cellPadding=0 width="98%" align=center border=0><TBODY><TR><TD vAlign=top width=22>http://www3.towerhobbies.com/images/mfr_info_tail.gif</TD><TD><TABLE cellSpacing=3 cellPadding=3 width="95%" align=center border=0><TBODY><TR><TD align=middle width="20%">http://www2.gpmd.com/mfglogos/axs.gif (http://www3.towerhobbies.com/cgi-bin/WTI0097p?P=SM&MANUFACTURER=AXS)</TD><TD vAlign=top width="40%">— Mailing Address —
Axi (AXS)
8766 SOUTH ST.
FISHERS, IN 46038


</TD><TD vAlign=top width="40%">— Additional Contact Information —
PHONE: 317-578-1955
EMAIL: jjezek@mscomposit.com (jjezek@mscomposit.com)
WORLD WIDE WEB: http://www.mscomposit.com/ (http://www.mscomposit.com/)
</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>

ron_van_sommeren
08-26-2008, 09:42 PM
lets see if i can find the MFG contact info www.modelmotors.cz
-> English flag

Vriendelijke groeten ;) Ron