Pump-Motor Fault Control via Temperature Flow Detection
Solution Overview
Problem
Conventional pump-motor assemblies in tall buildings face noise complaints and higher maintenance costs due to limited overhead clearance, and are prone to faults such as insufficient cooling and mechanical misalignment, which can lead to motor or pump damage.
Innovation Solution
A fault control system that monitors signals from transducers like current transformers, vibration sensors, and thermocouples to detect faults and generate alarm or stop signals to prevent damage, allowing for timely intervention and reducing maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a submersible motor is used to reduce noise, then noise levels are reduced, but detection of low flow conditions becomes more challenging due to the enclosed environment
Solution Approach 1:
The patent introduces temperature sensors as intermediary devices that indirectly detect flow conditions by measuring temperature changes in the liquid. Since temperature is easier to measure than flow directly, especially in submersible configurations, this intermediary measurement approach solves the detection difficulty while maintaining noise reduction benefits
2Reliability
If transducers and monitoring systems are added to detect faults, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent makes the controller multi-functional by enabling it to perform both motor control and fault detection functions. The controller analyzes data from multiple transducers using existing algorithms, allowing one component to serve multiple purposes and reducing overall system complexity despite the presence of multiple sensors
Solution Approach 2:
The system implements feedback mechanisms where the controller continuously monitors transducer readings and adjusts operations or alerts users based on detected conditions. This feedback loop enables reliable fault detection through systematic analysis of sensor data without requiring complex additional hardware
3Use of energy by moving object
If the pump-motor assembly operates at low speeds to reduce energy consumption, then energy efficiency is improved, but motor cooling becomes insufficient leading to potential damage
Solution Approach 1:
The patent implements preliminary monitoring of motor temperature and flow conditions before damage can occur. By detecting inadequate cooling conditions in advance through temperature sensors and flow analysis, the system can alert operators or adjust operations before motor damage happens, enabling safe low-speed operation with proper monitoring
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 fault control system effectively detects and mitigates faults in pump-motor assemblies, ensuring quiet operation and preventing damage by alerting users to potential issues before they cause harm, thus reducing maintenance costs and extending the lifespan of the equipment.
Implementation Method 1
a current transformer adapted to sense current flowing through a power line powering the motor
Implementation Method 2
because liquids transfer heat more efficiently than air, use of a submersible motor enables detection of low or no flow conditions
Data Source
AI summary
A fault control protects a pump-motor assembly from monitored faults. The pump-motor assembly includes an electrical motor mechanically coupled to a pump. The fault control determines a speed of the motor. If the speed is determined to be less than a minimum speed, the fault control generates a fault signal to affect the operation of the motor. The fault control can also determine if a phase of the power provided to the motor is missing based on vibrations sensed by a vibration transducer. The fault control can also determine temperature faults based on signals from two thermocouples, including determination of loss of inlet or discharge flow.