8/19/2019 Using Electromagnet to Lift Weights

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 The design specifcation o this project is to provide maximum generation o

magnetic orce using electromagnet to lit weights. The mechanical design o the

electromagnet consisted o layers o copper turns wounded onto hollow plastic

cylinder (plastic ormer) encased in magnetic steel cylinder – this is illustrated in

fgure 1. Many ways exist to generate a magnetic orce. The method our model

used was an electromagnet where the current was introduced rom a atterywhich !owed through the copper wires and as a result ormed a magnetic feld

around the coiled wire causing the metal core to ecome magnetising.

 There are " parameters here y which we are ale to vary the magnetic orce

generated# the numer o turns o the conductive wire ($)% type o current source

(here we have een provided with option# & ''' cells series & ''' cells parallel

1 cell)% Thic*ness o insulative enamel layer and thic*ness o u wire

(comined property o two layers will e reerred as +uage (,-+)%

resistance(optional).

val

Magnetic feld (/) output or all guage wire (0 ,-' – 2 ,-') was calculated

using e3.1 or each type o current source (& ''' cells series & ''' cells

parallel 1 cell). +raph was then plotted o / generated against -ire gauge or

each current source as shown in fgure &. 4rom the graph the cell showed pea*

/ e3ual to 1.& 5'6mm0 at 0" ,-+ wire guage. 4rom the graph the series & '''

cells showed pea* / e3ual to 1. 5'6mm0 at 07 ,-+. 4rom the graph the

parallel & ''' cells showed pea* / e3ual to 0.1 5'6mm 0 at 07 ,-+. 4or the

fnal design o the electromagment 00 ,-+ guage wire was used with & parallel

''' cells as this was shown rom the graph to give the maximum pea* magnetic

feld o 0.1 5'6mm0 . 4rom calculations with 00 ,-+ wire and & parallel '''

cells it was predicted that &.8*g would e maximum weight capacity ourelectromagnet would lit. 4rom the attery testing la session it was identifed

that the lowest internal resistance was measured rom the & ''' cells connected

in parallel using the 9MM multimeter and this urther convinced us to use & '''

cells connected in parallel as the current source in our fnal design. This was

ecause with the lower internal resistance greater current would !ow through

copper coil and since / (magnetic feld) is directly proportional to current

greater magnetic feld would have een given out and hence greater magnetic

orce. This would have enaled heavier weights to e lited and this satisfes to

our design specifcation.

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4rom completion o our project wor* the ollowing points can e concluded#

• &.8*g was calculated to e maximum weight capacity our electromagnet

would lit

• 12*g was actually lited at 1.":2 v

• 2 *g at 1."8 volts

• ;t can e drawn that the theoretical weight lited was less than the

measured weight lited due to magnetic hysteresis that caused extra