Spyro Fans use the latest IP65 Permanent Magnet Synchronous Motor technology. This is a gearless motor which provides a noise-free experience with zero maintenance. As the excitation of the field is provided by the perrnanent magnets, it can generate torque at zero speed.
PMSM needs a drive to operate; this drive helps in controlling the speed based on the temperature, velocity, pressure, etc. Addition of this drive helps in increasing the efficiency of the fans as controlling the speed is no more hassle in PMSM than in induction motors.