Integrated fan drive system for cooling tower

  • US 8,111,028 B2
  • Filed: 09/23/2008
  • Issued: 02/07/2012
  • Est. Priority Date: 10/10/2007
  • Status: Active Grant
First Claim
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1. A drive system for driving a fan in a cooling tower, the fan comprising a fan hub and fan blades attached to the fan hub, the drive system comprising:

  • a high-torque, low speed permanent magnet motor comprising a motor casing, a stator and a rotatable shaft, the rotatable shaft being configured for connection to the fan hub, the motor further comprising a dual bearing system consisting of a pair of radial bearings that locate and support the rotatable shaft relative to the motor casing; and

    a variable frequency drive device to generate electrical signals that effect rotation of the rotatable shaft of the motor at a rotational speed in order to rotate the fan.

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