i am making a robot with a rotating disk of 8KG and diameter of 1.5 ft . i want to rotate this disc using DC gear motor at a speed of 100 RPM . by my calculation that would require a an output power of 30 W . can someone confirm this calculation ??? it looks wrong to me . also if i use four 30W gear motors of different RPMs namely 100 , 200 , 300 , 400 and use them simultaneously to run the disc will the disc achieve 400 RPM ??? will this assembly work ??? i am building this robot as a hobby to compete in robo war on a local level . if anyone can help i will appreciate it
first of all i calculated I , moment of inertia , 1/2m(r square) . Then i calculated torque which is torque= I*(rad/sec) . I put 100 RPM after converting it . and then finally Power = torque*(rad/sec) . is this method correct ???
Only partly. I and torque enable angular acceleration to be calculated. You also need a time factor to get rpm. Your Watts will determine acceleration, not rpm. In theory, in a lossless system, no power would be used to maintain a given rpm (but of course your flywheel won't be lossless ).
Only partly. I and torque enable angular acceleration to be calculated. You also need a time factor to get rpm. Your Watts will determine acceleration, not rpm. In theory, in a lossless system, no power would be used to maintain a given rpm (but of course your flywheel won't be lossless ).
Only partly. I and torque enable angular acceleration to be calculated. You also need a time factor to get rpm. Your Watts will determine acceleration, not rpm. In theory, in a lossless system, no power would be used to maintain a given rpm (but of course your flywheel won't be lossless ).
l i calculated I , moment of inertia , 1/2m(r square) . i want my disc to rotate at 100RPM (10.466 rad/sec ) and want it to attain this speed in 2 secs . so i calculated (Angular Acceleration)=(rad/sec)/time . next i calculated torque by torque= I*angular acceleration . and finally i used POWER = torque * (rad/sec) . the answer comes out to be 11.44 W . i did all this calculation in SI units . is my calculation correct now ?
if it's a weapon, forget about a gearmotor; use a series/universal motor give it a couple minutes to spin up, and let 'er rip. Can you imagine that disk spiining @ 20,000 RPM when it hits your foe? Instant win.
did that convertor calculate output or input power . did you multiply it with a service factor ?? if you calculated output then you are probably right because i was converting units by myself so possibly i made a mistake . i will recheck
if it's a weapon, forget about a gearmotor; use a series/universal motor give it a couple minutes to spin up, and let 'er rip. Can you imagine that disk spiining @ 20,000 RPM when it hits your foe? Instant win.
if i use a series motor it will give my weapon very good RPM no doubt but would it be able to give me a continuous good torque . i mean if i use a geared universal motor , i.e limit its rpm but increase its torque , would it be more effective or not ??
No. What is a 'service factor' in this context ? What do you regard as 'output' here? I was calculating the theoretical power (in Watts) required to accelerate an 8kg disc in a lossless system. I have a feeling I may have lost a factor of 2xpi somewhere, though. 16W seems far too low a figure. My applied maths is pretty rusty . Anyone else out there feel like doing the sums?
by output i mean that when we are in a system which is not loss less , there will be some difference between input power supplied to the motor and the output power given by the motor . so the input power will be greater by a factor than output power