Calculations & material use

Maarten Van Overbeke

Technological Design Engineering

Docent: Rino Versluys

DC motor specifications

Place of origin: China

Brand name: Jiangkou

Model number: JK3233

Voltage: 12 V

Output power: 43.8 W

Torque: 0.138 N.m

Speed (max output): 3030 RPM

Gearings

1

2

Ratio 1 – 2

z1 = 1

z2 = 70

i = z2 / z1 = 70 / 1 = 70

Gearings

1

Gear 1

n1 = 3030 RPM

w1 = ( n1 x 2 rad) / ( 60 ) =( 3030 x 2 rad) / ( 60 ) = 317.3 rad/s

T1 = 0.138 N.m

P1 = T1 x w1 = 0.138 x 317.3 = 43.8 W

GearingsGear 2

i = 70

n1 x z1 = n2 x z2n2= ( n1 x z1 ) / z2 = ( 3030 x 1 ) / 70 = 43.3 RPM

w2 = ( n2 x 2 rad) / ( 60 ) =( 43.3 x 2 rad) / ( 60 ) = 4.53 rad/s

T2 = T1 x i x = 0.138 x 70 x 1 = 9.66 Nm

P2 = T2 x w2 = 9.66 x 4.5 = 43.47 W

2

Gear 3 ( on the same axle )

n3= n2 = 43.3 RPM

w3 = w2 = 4.53 rad/s

3

Gearings

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At what speed does the car window moves down ?

vb = ?

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unvisible

At what speed does the car window moves down ?

vb = ?

w3 = 4.53 rad/s

Speed v3 ?

r3 = 0.02 m

w3 = 4.53 rad/s

v3 = r3 x w3 = 0.020 x 4.53 = 0.0906 m/s

v3 = 0.0906

m/s

Speed v4 en w4?

v3 = v4 = 0.0906 m/s

r4 = 0.1 m

w4 = v4 / r4 = 0.0906 / 0.1 = 0.906 rad/s

v3 = v

4 = 0.0906

m/s4

w4 = 0.906 rad/s

fixed rotation point

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w4 = 0.906 rad/s

va = 0

.0453 m

/s

a

Speed va ?

ra = 0.05 m

va = ra x w4 = 0.05 x 0.906 = 0.0453 m/s

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va = 0

.0453 m

/s

Speed vb?

vb = va x cos = 0.0453 x sin( 45) = 0.032 m/s

= 45°

b

vb

visible

unvisible

Time to go down?

0.032 m 1 s

x6.25 x6.25

0.2 m 6.25 s

vb = 0.032 m/s

x = 0.2 m

Materials & production...

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Material use and production technique

Window glassmaterial: 2 panes of glass with nterlayer of PVB

Arm linkagematerial: galvanized steelproduction: deep drawing

Half and small spur gearmaterial: stainless steelproduction: gear cutting

Roller guidesmaterial: galvanized steelproduction: roll forming

Boltsmaterial: galvanized steelProduction: heading - thread rolling - blackening

Material use gears

small components...

(stator)

(rotor)

Hall effect switch

thermal switch (joule effect)

Hall-effect switch...

Hall sensor

signal

For instance: push

window motor

window open

(counting = value)

(output = o)