Speed = Distance / Time

Rotational Speed = Rotational Cycles / Time

Rotational Speed = Degrees / Time

Torque = Force x Distance

Force = Torque / Distance

Where the Distance is the distance from the axis of rotation

Power = Force x Velocity

**Motor Key Specs:**

- Stall Torque
- Free Speed
- Stall Current
- Free Current

**For determining motor characteristics as voltage varies:**

New Value = Spec Value x (New Voltage / Spec Voltage)

**For determining Motor Current Draw at a given Torque Load:**

Current Draw = ((Stall Current – Free Current) / Stall Torque) x Given Torque Load + Free Current

**For determining the Torque Load at a given Motor Current Draw:**

Torque Load = (Given Motor Current – Free Current) x Stall Torque / (Stall Current – Free Current)

**For determining Motor Rotational Speed at a given Torque Load:**

Rotational Speed = -(Free Speed / Stall Torque) x Given Torque Load + Free Speed

**For determining “Super” Motor Specs from Multiple Motors combined as one, geared to the same Speed:**

Free Speed = SAME

Stall Torque = Sum of all Motor Stall Torques

Stall Current = Sum of all Motor Stall Currents

Free Current = Sum of all Motor Free Currents