Fan Brake Torque Control to Prevent Shock Loads
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Solution Overview
Problem
Existing fan brake systems for cooling towers and air-cooled condensers lack effective solutions to safely and automatically slow, stop, and lock rotating machinery at high speeds without inducing shock loads, posing safety risks to personnel and equipment, and are inefficient due to the need for continuous electricity for electric brakes.
Innovation Solution
A fan brake control system comprising a fan brake, position sensor, microcontroller, and actuator, which calibrates the brake position, receives commands to open or close the brake, and monitors the brake pad's displacement to ensure proper engagement, allowing for automated and controlled braking while maintaining a predetermined torque profile to prevent shock loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fan brake system is implemented to stop rotating machinery, then safety of personnel and equipment is improved, but shock loads may be induced that damage the machinery
Solution Approach 1:
The brake system dynamically adjusts the braking torque during the stopping process. It applies maximum braking force initially to quickly reduce speed, then progressively reduces torque as the fan approaches zero speed, preventing shock loads while ensuring safe stopping
Solution Approach 2:
The system performs preliminary assessment of the fan's operational state before applying brakes. It monitors fan speed and operational status, and only initiates braking when appropriate conditions are met, preventing premature braking that could cause damage
2Extent of automation
If an electric brake is used to control the fan, then automated braking is achieved, but continuous electricity is required which reduces energy efficiency
Solution Approach 1:
The electric brake motor operates periodically rather than continuously. It activates only when braking is required, performs the braking action, and then remains inactive. This periodic operation significantly reduces energy consumption compared to continuous operation
Solution Approach 2:
The system uses the fan's own kinetic energy and momentum to maintain rotation during normal operation, requiring no continuous energy input. The brake motor only consumes energy when needed to remove this kinetic energy during stopping
3Ease of operation
If the brake is applied remotely without monitoring, then operation simplicity is improved, but brake pad engagement position cannot be confirmed leading to potential damage
Solution Approach 1:
The system incorporates position sensors that continuously monitor the brake pad's position relative to the rotor. This feedback is sent to the controller, which confirms proper engagement before allowing the fan to be considered stopped, ensuring reliable brake application
Solution Approach 2:
The system replaces manual visual inspection of brake engagement with electronic sensing and automated confirmation. Sensors detect brake pad position and the controller automatically verifies proper engagement, eliminating the need for personnel to physically check the brake
4Ease of operation
If the fan is allowed to spin freely during non-storm conditions, then ease of operation is improved, but personnel safety is compromised due to unexpected rotation
Solution Approach 1:
The position sensor continuously monitors whether the brake is engaged or disengaged and provides feedback to the controller. This allows the system to know the real-time status of the fan and alert personnel or automatically engage the brake if unauthorized movement is detected
Solution Approach 2:
The brake system acts as an intermediary safety device between the fan and personnel. Even when the fan is accessible during non-storm conditions, the brake can be quickly engaged to stop the fan if personnel presence is detected, providing a safety buffer
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system safely and automatically slows, stops, and locks rotating machinery at high speeds, minimizing shock loads and ensuring safety, while also being energy-efficient by maintaining the brake position during power loss and adapting to different machinery sizes and types.
Implementation Method 1
the controller is operable to monitor and control power being supplied to the motor of the actuator during the braking procedure to maintain a torque output of the motor according to a predetermined torque profile
Implementation Method 2
A fan brake having a brake pad movable on the fan brake to selectively engage the fan system
Data Source
AI summary
A fan brake system for controlling an industrial fan system, the fan brake system including a fan brake having a brake pad movable on the fan brake to selectively engage the fan system. An actuator including a motor can be operable to cause the fan brake to perform a braking procedure on the fan system to resist rotational movement of the fan system. A controller can be communicated with the actuator, the controller operable to selectively cause the actuator and the fan brake to perform the braking procedure, wherein the controller is operable to monitor and control power being supplied to the motor of the actuator during the braking procedure to maintain a torque output of the motor according to a predetermined torque profile during the braking procedure.