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Final Year Project: Condition Monitoring of Electrical Machines

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by

Rafael Low

on 14 October 2013

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Transcript of Final Year Project: Condition Monitoring of Electrical Machines

VSD Inverter (Motor Controller)
Controls Motor Speed
Receive data from user or data processing Station
Induction Motor
3 phase power supplied from inverter
Centrifugal Pump
Data Collector Circuit
Collects data from sensors
Transmit data to processor
3 Phase Power Supply

Remote Data Processor
Receive data from data collector
Detect faults
Determine pump curve
Determine health of Motor
Determine health of Pump
Schedule maintenance
Predict failures
Transmit control signals to Inverter
Power Signals
Direct Coupling
Water Inlet
Water Outlet
Current Sensor 1
BW 2kHz
Temperature
Sensor
Vibration
Sensor
Pressure
Sensor
Components
1. Power converters
2. Analogue to digital signal processing
3. Multiplexors
4. Transmitter
5. Master clock
6. Digital Registers

Power Converter
Power up data collector circuit
Power up sensors
Analogue to Digital Signal Converter
Convert sensor analogue signals into digital signals for transmission and further processing
Sampling rate at minimum of 5kHz
Fourier Analysis of analogue current signals is up to frequency of 2kHz
Multiplexor
Only one transmitter is used, therefore the digitally processed signals from the sensors have to be transmitted serially and wirelessly
Transmitter
Data is digitally transmitted using XBEE transmitter
Current Sensor 2
BW 2kHz
Current Sensor 3
BW 2kHz
Master Clock
The master clock makes sure the circuit is running on time
Registers
Store data to be multiplexed
data and power cables
CS1 Current Sensor 1
CS2 Current Sensor 2
CS3 Current Sensor 3
PS Pressure Sensor
VS Vibration Sensor
TS Temperature Sensor
CS1
CS2
CS3
PS
VS
TS
CS1
CS2
PS
VS
TS
0.2ms
Multiplexor Signals Switching Timing
0.03ms
CS3
Min sampling rate: 5kHz
Condition Monitoring of Electric Machines
Detect Motor Faults
Shaft faults
Rotor faults
Stator faults
Motor Bearing Housing faults
Rolling Element Bearings faults
Motor insulation faults
Detect Pump Faults
Impeller faults
Bearing faults
Bearing frame faults,
Shaft faults
Mechanical seal faults
Phase 1:
Data Collector Circuit with CS1, CS2 & CS3 signals transmitted wirelessly to computer for processing
Research on components of the Data Collector Circuit
Design circuit based on phase 2
Simulate circuit on SPICE
Build circuit

Phase 3:
Include more sensor signals into Data Collector Circuit to transmit to computer for processing
Phase 2:
Circuit paired with PC software
Low Rafael
ECE Department
B.Eng Electrical Engineering (Hons)
A0087918L
97368121
A0087918@nus.edu.sg
lowrafael@gmail.com
Full transcript