Physics Help Forum motor torque racing simulator

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Apr 2nd 2019, 10:27 AM #1 Junior Member   Join Date: Apr 2019 Posts: 1 motor torque racing simulator Hi guys, I am building a motion racing simulator. i am trying to calc what are the characteristics of the motor that i need. i want to raise 80 kg (160 lbs) with a servo motor the motor is connected to a 8" (20cm) arm. the arm is connected to the weight, and needs to raise it 180 degrees from buttom to top. i need it to achieve 2 g's and 75 rpm. i thought using a planetary reducer, ratio 1:40 ,and a servo motor that turns at 3000 rpm i calculated that a motor rated at 200w and 0.6nm (times 40 after reduction will give me more then enough torque) will suffice. is that correct ? can you show me the math ? Thanks a lot !
 Apr 2nd 2019, 04:57 PM #2 Senior Member   Join Date: Apr 2017 Posts: 484 I think using power ratings of a motor may lead to inaccuracies . The input power (VxI) will not all be converted into torque , and the power and efficiency vary with revs .... Some motors do have a torque rating ... e bike motors are a good example , This one "has a rated power of 250-750W, a reduction ratio of 1: 5 and a maximum torque of 80 N.m," (\$200) That maximum torque is probably at zero revs . So if the lever arm connected to the motor was 1 meter , the force at the end of the arm is 80N ... It could hold a 8kg weight when the arm is horizontal ... more when not horizontal. But your arm is 0.2 meter you have a 5:1 advantage . So the above motor could hold 40Kg horizontally. If you want the same motor to accelerate the mass at the end of the lever , you must reduce it ... An acceleration of 2gs of the mass means , when horizontal , the mass experiences 1g from gravity and 2 g from acceleration = 3g So the mass must be reduced threefold ...40/3 = 13.333Kg This gives a rough indication of the power of motor need to do what you want ...Many KWs!! Here's the torque chart for a bigger ebike motor .... this would be a brushless motor neila9876 likes this. Last edited by oz93666; Apr 2nd 2019 at 05:18 PM.

 Tags motor, racing, simulator, torque

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