Intelliflo Variable Speed Pumps use Totally Enclosed Fan Cooled Permanent Magnet Synchronous Motors.
Permanent Magnet Synchronous Motors (PMSM) are like an upgraded, higher efficiency version of Brushless Direct Current (BLDC) Motors because they use a pure sinusoidal wave to drive the motor (which comes from the motor driver manipulating our pure-sine-wave AC power source) rather than a trapezoidal wave (which the motor driver creates from a DC power source).
Alternatively, PMSMs can be seen as the Alternate Current (AC) version of BLDCs, which run on a Direct Current (DC) Source.
More knowledgeable members should correct me if this information is not accurate.