What is the initial force required to start an electric motor and generator?

AI Thread Summary
To determine the initial force required to start an electric motor, one must understand the relationship between force, torque, and the dimensions of the motor's rotor. The discussion emphasizes that the force needed can be calculated using the formula for horsepower, which relates force, torque, and RPM. It is suggested that assuming an RPM of 1 can simplify calculations for starting conditions. Additionally, the torque on a generator connected to the motor will depend on the motor's force multiplied by the distance from the motor to the generator connection point. Understanding these principles is essential for accurately calculating the initial force for both the motor and the generator.
wassim99
Messages
2
Reaction score
0
Hello all,
So I am confused about a a scenario and I hope you guys can hook me up with some explanation.
So I am trying to find the initial force needed for an electric motor to turn. I am not looking for torque or energy just the Newtons just to start from scratch and keep going with the math. with a force X during a certain time with a length Y of the shaft, etc.. I think this is the best way to understand how does the electric motor work. so if I have a the motor connected to a wall plug or running on gas or battery how much force will it take that after we convert it to torqu it will be enough to turn the electric motor shaft.
now let's assume the motor shaft hooks to a small generator through a belt. How much force will the generator need to turn.
I believe the force of the motor should be the sum of both forces or something within those lines. Can you guys tell me how to get the initial force on each, just the force to get it to start turning. I am attaching a little drawing to show the setup.
please use any initial assumptions you want as long as it serves the purpose of finding the initial force.
Thanks a lot for your time and help
 

Attachments

  • motor+generator.png
    motor+generator.png
    2.7 KB · Views: 609
Engineering news on Phys.org
Do you know how to find the torque of the motor? From there you can relate the force given you have the dimensions of the rotor.
 
wassim99 said:
...so if I have a the motor connected to a wall plug or running on gas or battery ...

I'm still trying to figure out how to run an electric motor on gas. Hmmm...
 
thanks all, that was fast.. :)
so Assuming that I need 10HP to start moving an electric car. HP=CxFxRPM/33000. usually it is 2TT (TxRPM)/33000 but torque is FxR and 2TT xR is C (circumference).
So F=CxRPM/330,00 x 10 =CxRPM/330,000. But How would I find the RPM at start, can I assume it is 1 RPM (just to get the car moving)
And the major question is: if the motor uses a 100N force that gives a 200Nm Torque (just for example). Will the torque on the generator attached to the shaft (in the picture above) be the motor force x the shaft or axle distance to where the generator connects to the motor?
THanks
 

Thread 'Race car suspension Class'

Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
View full post »

Thread 'Cantilever help'

I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
View full post »
Thread 'What's the most likely cause for this carbon seal crack?'

Thread 'What's the most likely cause for this carbon seal crack?'

We have a molded carbon graphite seal that is used in an inline axial piston, variable displacement hydraulic pump. One of our customers reported that, when using the “A” parts in the past, they only needed to replace them due to normal wear. However, after switching to our parts, the replacement cycle seems to be much shorter due to “broken” or “cracked” failures. This issue was identified after hydraulic fluid leakage was observed. According to their records, the same problem has occurred...
View full post »

Similar threads

Flow in and out of hydraulic motor
Replies
6
Views
2K
Determine torque required to move load
Replies
6
Views
2K
Using a motor to spin two discs in opposite directions
Replies
6
Views
804
Gravity battery question
Replies
18
Views
1K
Is a Larger DC Motor Needed for Low Wind Speed Power Generation?
Replies
34
Views
4K
Friction between motor and flywheel
Replies
9
Views
2K
How to Measure Torque Required for motor to spin a rotating shaft?
Replies
3
Views
4K
How to spec a motor for this floor testing system?
Replies
10
Views
2K
Generator start-up torque
Replies
2
Views
2K
Maximum torque required to turn the wheel along the vertical axis
Replies
9
Views
2K

Hot Threads

Recent Insights

Back
Top