What are the benefits of choosing a motor with a higher motor constant (Km)?

The motor constant (Km) of a motor is a ratio of the motor’s torque and the square root of the power dissipated. It is a numerical description of how well a motor can convert electrical energy into useful torque rather than resistive heat. It is a useful way to compare two motors. A motor with a higher Km will be able to output the same torque while staying cooler than an otherwise equivalent motor with a lower Km. Km should be an important consideration for any application that has thermal or efficiency limitations.

Learn more about why Km matters for thermally limited applications here.

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