Integrated fan drive system for cooling tower
First Claim
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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;
sensors to measure heat of the stator and the bearings and output signals representing the measured heat;
a variable motor-speed control 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 heat and in response, generating the control signals for input into the device.
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Abstract
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.
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Citations
7 Claims
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1. A wet cooling tower for cooling liquids used in a process, comprising:
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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; sensors to measure heat of the stator and the bearings and output signals representing the measured heat; a variable motor-speed control 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 heat and in response, generating the control signals for input into the device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wet cooling tower for cooling liquids used in a process, comprising:
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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; an airflow sensor to measure airflow produced by rotation of the fan and output signals representing the measured airflow; a variable motor-speed control 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 airflow and in response, generating the control signals for input into the device.
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Specification