Torque

From the manufacturer, look for the following information:

1. • Motor voltage

   • Motor stall current

   • Stall torque (g*cm OR oz-in) 

   • No-load speed  / RPM (revolutions per minute)

Voltage and Current: Power the motor with a supply that can provide the recommend voltage and, ideally 10% to 20% more than the stall current. (this is also known as “headroom”)

Example: A 6v motor has a 180mA (0.18amps) stall current. The power supply should be 6v and provide at least 200mA(0.20) of current.

Motor Torque is the output force of the motor.  When you reach stall torque, the motor is not turning at all (RPM=0). Stalling the motor for more than a short period can damage it. 

Example: if a motor has a stall torque at 20g*cm...

1. • The motor will not rotate with or over 20g of mass, 1cm from the shaft. 

   • The motor will not rotate with or over 10g of mass, 2cm from the shaft. 

   • The motor will not rotate with or over 6.6g of mass, 3cm from the shaft.