swl of a motor

red4ever

using the following information can anyone tell me if the detailed motor is capable of lifting 90kgs 48"

Nominal speed 40 rpm
Nominal torque 5 Nm
Nominal voltage 12 V
Shaft diameter 9 mm
Manufacturer part no. DO 111.3761.2B.00 / 3018
Specification DC gear motor
Nominal current 5 A
Shaft design With key 3
Type DO11137612B00/3018

http://www.conrad-uk.com/ce/en/produ...01101&ref=list
regards
red

russ_watters

Depends on how fast you want to lift it.

red4ever

takes about about 10-15 seconds with current motor

pantaz

Describe the lift mechanism (i.e., rope on a drum, like a winch), including dimensions.

red4ever

I will be using nylon tape 25mm wide which coils onto a small drum approx 30mm i/d 75mm o/d

http://www.bruno.com/vehicle-lift-take-apart-lifts.html

this the hoist mechanism

red4ever

any ideas people? trying to save a disabled guy £450

Jobrag

Your downward force is 90*9.81 N (call it 900) so if your drum is .037 m radius you need a torque of 33.3 NM so you'd need a 7:1 reduction gearbox.
To raise 90 Kg over 1.2 M you need about 1000 J, 12V*5A is 60w so it would take slightly over 15 seconds for the lift.

red4ever

thanks jobrag
thats brilliant

wzrdstrm

Jobrag,
I have a question please. If this was an application with a rope wrapped around the drum, would we not consider the diameter of the rope in addtion to the radius of the drum to back calculate the force necessary?