Which of the following is an advantage of ECM motors over PSC motors?

The choice indicating higher energy efficiency as an advantage of ECM (Electronically Commutated Motor) motors over PSC (Permanent Split Capacitor) motors is correct. ECM motors are designed with advanced electronic controls that allow for precise speed and torque management. This capability enhances their overall energy efficiency significantly compared to PSC motors, which operate at a fixed speed determined by the voltage applied and the motor design itself.

ECM motors can vary their speed based on the demands of the application, leading to lower energy consumption during partial load conditions. This adaptability means that they can provide the necessary performance while consuming less power, making them particularly advantageous in applications that do not require constant full-speed operation.

In contrast, options suggesting lower cost, longer lifespan, or more horsepower options do not accurately reflect the advantages of ECM motors. While ECM motors may have higher initial costs due to their complex design, their long-term energy savings and potential reduction in operational costs often outweigh this upfront investment, highlighting their efficiency as the key advantage. Therefore, focusing on energy efficiency provides the best understanding of how ECM motors surpass PSC motors in terms of operational performance.