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Motor models

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Demonstrating simulations of a DC and a two phase stepper motor.

Model of a generic DC motor.

The model has the motor positive and negative power supply terminals.

It also has three outputs.

TORQUE is a voltage representing the motor torque scaled as 1V/Nm.

ANGVEL is a voltage representing the angular velocity of the motor scaled as 1V/RADIAN/s.

POSITION is a voltage representing the angular position of the motor scaled as 1V/RADIAN.

The subckt netlist has the following user editable parameters:

DCR = 0.5 ; Ohms. DC resistance

LSER = 1.5m ; H. Series inductance of motor

KT = 0.05 ; Nm/A. Torque Constant

JM = 250u ; Nm/rad/s2. Total inertia of motor plus load

BM = 100u ; Nm/rad/s. Total friction of motor plus load

KEMF = 0.05 ; V/rad/s. Speed Constant

For background information, see:


Stepper motor test jig

This sim demonstrates the TORQUE, OMEGA (angular velocity) and POSN (Position) outputs of the subcircuit model of an ARSAPE_AM2224_AV_18 2 phase stepper motor when driven by an ideal reversible quadrature drive source.

Stepper motor check jig

This sim takes the subcircuit model of an ARSAPE_AM2224_AV_18 2 phase stepper motor and applies a voltage to the 'omega' motor angular velocity terminal to represent spinning the motor shaft from an external drive.

The motor then operates as a generator and the voltages across the AP and AN pins and across the BP and BN pins is plotted.

Open in Editor then CTRL+R to run sim.

Configure traces using the blue gear icon in the WaveForm display.



Stepper motor test jig

Stepper motor check jig


ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier Supplier Part Price LCSC Assembly Mounted
1 PULSE(0 10 1m 1u 1u 1 2) V1 2P-5.0 1
3 ARSAPE_AM2224_AV_18 U1 ? 1
4 PULSE({-drv} {drv} {tdela} 1u 1u {tper/2} {tper}) V1 2P-5.0 1
5 PULSE({-drv} {drv} {tdelb} 1u 1u {tper/2} {tper}) V2 2P-5.0 1
6 PULSE(0 2 0 500m 500m 3) V1 2P-5.0 1


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