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Stepper Motor Maximum Speed and Power Calculator

See our other Electronics Calculators.

Stepper motors are normally used for positioning, and are not known for their speed.  This calculator computes the maximum speed of a stepper motor, which is limited by the time it takes for the coil to energize to it's maximum holding current, and then de-engergize as polarity flips. 

Input:

Imax (A)
L (mH)
Voltage (V)   
Steps/Revolution  Steps

Result:

Maximum Speed (revolutions/sec)
Minium Time/Step (miliseconds)
Maximum Power (Watts)

Equations:

Current through the coil is proportional to the time that the voltage has been applied, and inversly proportional to the inductance. 

I= V*T/L

T= I*L/V

For one step the current must go from 0 to Imax and back to 0, or alternatively from -Imax to +Imax. 

I= 2*Imax

T= L*Imax*2/V

T is the number of seconds for a single step.

To compute maximum revolutions per second - divide seconds per step by steps per revolution.

Rev/sec = V/(L*2*Imax)/(steps/rev)

Pmax= 2*Imax*V

Pmax occurs not when the motor is going max speed because the current is a triangle wave.  Pmax occurs when the slope of the current is small compared to the on holding time of the step pulse.

 

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Daycounter specializes in contract electronics design.  Do you need some help on your project?  Contact us to get a quote.

 

Disclaimer:  Daycounter, Inc. doesn't guarantee the result or accuracy of this free calculator. 

 

 

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