Integrated fan drive system for cooling tower

摘要

A drive system for driving a fan in a wet cooling tower, wherein the fan has a fan hub and fan blades attached to the fan hub. The drive system has a high-torque, low speed permanent magnet motor having a motor casing, a stator and a rotatable shaft, wherein the rotatable shaft is configured for connection to the fan hub. The drive system includes a variable frequency drive device to generate electrical signals that effect rotation of the rotatable shaft of the motor in order to rotate the fan.

主权项

1. A wet cooling tower for cooling liquids used in a process, comprising:
a cooling tower structure; a motor supported by the cooling tower structure and comprising a rotatable shaft, a stator and bearings that locate and support the rotatable shaft; a fan connected to the rotatable shaft of the motor such that rotation of the rotatable shaft causes rotation of the fan; a sensor to measure vibrations of the bearings and output signals representing the measured vibrations; a device to generate electrical signals that cause rotation of the rotatable shaft of the motor at a predetermined rotational speed in order to rotate the fan, the device having an input for receiving control signals representing the predetermined rotational speed; and a computer external to the motor for processing the signals representing the measured vibrations and in response, generating the control signals for input into the device.