Posted by: BeerFizz ® 11/28/2006, 15:02:37 Author Profile eMail author Edit

Hi, I am able to measure the voltage, rpm and current of a motor when modifying a PWM input from zero to full. If necessary, I could calculate the stall torque. With this information is it possible to calculate the torque of the motor (theoretically) without doing specific measurements? Thanks for all assistance.

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Re: Motor Torque
Re: Motor Torque -- BeerFizz	Post Reply	Top of thread	Forum

Posted by: zekeman ® 11/28/2006, 23:20:21 Author Profile eMail author Edit

Yes, once you know the stall torque, measure its corresponding RMS current.Then all other torques are proportional to the RMS current. Must be RMS current.

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Re: Re: Motor Torque
Re: Re: Motor Torque -- zekeman	Post Reply	Top of thread	Forum

Posted by: BeerFizz ® 11/28/2006, 23:31:21 Author Profile eMail author Edit

Thank you Zekeman How do I calculate the RMS current? What is the formula? Thanks

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Re: Re: Re: Motor Torque
Re: Re: Re: Motor Torque -- BeerFizz	Post Reply	Top of thread	Forum

Posted by: zekeman ® 11/29/2006, 00:16:27 Author Profile eMail author Edit

You don't calculate the current, you measure it with an RMS ammeter. For example, say the stall torque were 5 lb ft at a measured 10 amps RMS, then you run the motor and measure an RMS current of 6 amps. Then the torque is 6/10*5=3 Lb ft

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