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# how to make most powerful electromagnet using 25 volt source? Answered

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## 18 Replies

nit1111 (author)2013-07-06

hey guys wat should b the least rpm of motor if i want to make 500g weight flying plane?????//

jbewley1 (author)2014-09-06

i also just did a little bit of research and you will get about 650 grams of thrust off of 38000 rpms at 11.1 volts and 30 amps

jbewley1 (author)2014-09-06

it depends on the propeller or ducted fan you use and the battery and the esc you need to get at least 500 grams of thrust from the system. if you can find out how many grams of thrust per rpm your propeller gives then you can find how many rpms you need to get at least 500 grams then divide it by the voltage of your battery and then you will have the kv rating of motor you need if you are using brushless and make sure your esc gives off the correct number of amps for the motor. for 500 grams of thrust you will need around 11.1 volts at 35 amps or two 11.1 volt esc's at 18 amps

iceng (author)2013-07-06

16 RPM

How is your 25 Volt 15 cm long magnet project progressing ?????//

steveastrouk (author)2013-02-22

Current and number of turns determines magnetic field strength, coil core material determines flux strength. The question starts with how big is the electromagnet to be.

iceng (author)2013-02-22

+1
You could get 25+ volts using 17 C cell 4 Amp batteries in series,
or two 12 Volt 200 Amp car batteries in series

Steve points out the current not voltage makes electromagnets !

nit1111 (author)2013-02-26

battery is not a problem,,,,,,,,i want to know how much turns and layer of wire is required?

iceng (author)2013-02-26
Start here.
Practice here page six.
Understand here.

Now select
• An iron core of the best and most permeable metal available.
• An available copper gauge 00 or bigger diameter wire
• Measure the resistance R of one turn.
• Calculate I = V / ( R×Turns )  for 10, 100, 1000  Turns
• Calculate Amp Turns

Now remember whatever armature you can do.
Professional Guinness competitor will out do you !!

steveastrouk (author)2013-02-27

Try a big old transformer. The iron in them should be ideal.

nit1111 (author)2013-02-26

hey can you also answer does increasing no. of layer increase magnetic field and upto what extent????

steveastrouk (author)2013-02-27

Up to the point the magnetic core saturates with flux.

iceng (author)2013-02-26

Yes it does.

You begin to loose some of the magnetic field to fringing when the layers
stack diameter starts to approach the same dimension as the coil length.

nit1111 (author)2013-02-26

wats dis copper gauge 00 ...........(actually wat diameter motor wire would i ask shopkeeper??)

iceng (author)2013-02-26

zero zero wire gauge magnet wire is o.365" in diameter and is good for conducting up to 280 amperes of current.

steveastrouk (author)2013-02-26

Get a high temperature insulation on it too

nit1111 (author)2013-02-26

the electromagnet i want to make can b as big as it can be ,size does't matter..........how much wire will be required to make best????????

steveastrouk (author)2013-02-26