Motor Torque
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Posted by: BeerFizz ®

11/28/2006, 15:02:37

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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

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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

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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

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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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