PM motors on a variety of applications has been done for 10 years. Cooling towers, fluid coolers, etc. The motor cost has not allowed it to go mainstream due to rare earth cost for the magnets.
- A drive system for rotating a fan in a wet cooling tower, comprising
a permanent magnet motor comprising a motor casing,
a stator and
a rotatable shaft configured for connection to a fan in a wet cooling tower, the motor further comprising
a dual bearing system comprising a pair of bearings that locate and support the rotatable shaft relative to the motor casing, the drive system further comprising
sensors for measuring vibrations of the bearings and outputting signals representing the measured vibrations, and
sensors for measuring heat of the stator and the bearings and outputting signals representing the measured heat.