What is motor constant and why is it important in the motor selection process?

Motor constant (Km) is equal to torque divided by the square-root of resistive power losses. It helps to show the efficiency of the motor (example: a higher motor constant means higher efficiency). The required motor constant for your application can be calculated and used to select a motor where there are significant thermal limitations, in which case the torque specifications on the datasheet may not be sufficient when rated at the limited temperature.

Click to read the technical article ‘Why Motor Constant Matters in Thermally Limited Applications’, for more information on motor constant and why it is useful for selecting a motor.

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