Housed Brushless DC Motors are much more efficient and capable of driving high load inertias, compared to Stepper Motor Actuators.  These motors have tremendous mechanical power output capacity and high efficiency.  Frame sizes up to 3.0” (76mm) and power output to 4 kWatts are currently available.  Honeybee’s “True-Trap” back emf provides low torque ripple, even with trapezoidal commutation.