Sizing a mototr to the right torque

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    Sizing Torque
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To determine the appropriate motor for rotating a 650-pound motorcycle at 1 RPM, an AC synchronous motor is recommended over a DC motor due to its ability to maintain consistent speed without additional sensors. The suggested torque of 18 ft/lbs appears adequate for the task, allowing the display to reach the desired speed quickly, assuming minimal friction. The motor's specifications should align with the project’s requirements, particularly regarding shaft length. Overall, careful consideration of motor type and torque is crucial for successful operation. Proper selection will ensure the motorcycle display functions smoothly at the car show.
RHorseUSMC
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Hello- new to the board and had a question for anyone that can help. I am trying to figure what size motor I will need for a project. My brother has built a custom motor cycle and to showcase it at the carshow we were going to mount the motor cycle on a platform and rotate it at approx. 1 revolution per minute. the bike weighs approx. 650 pounds. I am not sure if we should use a AC or DC motor. I know the length of the shaft and will need to be figured as well. I am open to any suggestions. We thought a DC moto rated @ 1.5 RPM and 18 ft/lbs of torque might work but I thought I would check with someone that knows a bit more on the subject. Thank you. Please feel free to email me any suggestions-Rick
 
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The torque sounds about right. I calculate that your display with motorcycle on it will spin up to the desired 1rpm in about 1 second. That's provided your friction is small compared with the motor torque.

I would guess you should use an AC synchronous motor. A DC motor wouldn't operate at the correct rpm without some kind of speed sensor and feedback.
 

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