I don't know. Do some googling. Bear in mind that the motor will be more or less stalled for a lengthy period while getting the flywheel up to speed, so will draw a large current. I guess efficiency varies with rpm and load.
ok . got a really good deal on DC motor . A used DC motor of 24 V and 9.6 A with 450RPM . i'm guessing the efficiency to be around 50% . is it going to be enough ?
Time will tell .
BTW, is that 9.6A the current at max speed? If so the stall current will be MUCH greater.
You will need bigger batteries than 5Ah if you want more than a few minutes running time.
yup it is the current at max speed . i thought about using a 24V 7Ah batteries . think it will be enough . i only need them to run motor for 12 to 15 minutes
If I were building this I would assume the average motor current would be ~20A, which means the 7Ah battery would be completely flattened in 7/20h = 20mins. You don't want to run a battery completely flat or you'll kill it. So 7Ah would not be enough for 12-15 mins in my opinion.
BTW, are you aware the gyro effect of that flywheel will be huge and make the robot impossible to steer unless the flywheel axis is vertical?
If I were building this I would assume the average motor current would be ~20A, which means the 7Ah battery would be completely flattened in 7/20h = 20mins. You don't want to run a battery completely flat or you'll kill it. So 7Ah would not be enough for 12-15 mins in my opinion.