Sizing a mototr to the right torque

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  • Thread starter Thread starter RHorseUSMC
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    Sizing Torque
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SUMMARY

The discussion centers on selecting the appropriate motor for rotating a custom motorcycle display at approximately 1 revolution per minute (RPM). The motorcycle weighs around 650 pounds, and the initial consideration was a DC motor rated at 1.5 RPM and 18 ft/lbs of torque. However, it is concluded that an AC synchronous motor is more suitable due to its ability to maintain the desired RPM without the need for additional speed sensors and feedback mechanisms.

PREREQUISITES
  • Understanding of motor types, specifically AC synchronous and DC motors
  • Basic knowledge of torque and RPM calculations
  • Familiarity with weight and load considerations in motor applications
  • Awareness of friction's impact on motor performance
NEXT STEPS
  • Research AC synchronous motor specifications and applications
  • Learn about torque calculations for rotating heavy objects
  • Explore the differences between AC and DC motors in practical applications
  • Investigate methods to minimize friction in mechanical systems
USEFUL FOR

Engineers, hobbyists, and anyone involved in mechanical design or motor selection for rotating displays or similar projects.

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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