NEMA Design _____ motors are the most commonly used motors.

NEMA Design B motors are recognized as the most commonly used type of AC motors, particularly in applications requiring a moderate starting torque. These motors are characterized by their ability to efficiently handle a range of loads, delivering good performance across various operating conditions. Their design is optimal for applications such as fans, blowers, pumps, and conveyor systems, where maintaining continuous operation under different load conditions is essential.

Design B motors typically have a service factor of 1.15, which means they can operate at 115% of their rated horsepower without overheating. This level of service factor makes them versatile and reliable for a wide array of industrial and commercial applications. In contrast, other NEMA designs cater to specific needs, such as high starting torque for Design D motors or high efficiency and low starting current for Design C motors, but they are not as broadly utilized as Design B motors, which explains their popularity in the industry.