1. Correlation of Electrical and Vibration Data of Machine Faults Hala Abualsaud, Nour Boland Project advisor: George Collins (SKF/Baker USA, Fort Collins) Industry Advisors: Mike Teska, Craig Powers (SKF/Baker USA, Fort Collins) Department of Electrical and Computer Engineering Colorado State University Motors are devices that convert electrical and magnetic energy to mechanical energy. Motors are devices that convert electrical and magnetic energy to mechanical energy. Main thing to look for in motors: Main thing to look for in motors: 1.Horse Power 2.Voltage Level 3.Frequency 4.RPM (Revolution Per Minute) 5.Single or three phase The outside of a motor consist of: The outside of a motor consist of: 1.Key 2.Fins 3.Fan The inside of a motor consists of: The inside of a motor consists of: 1.Rotor 2.Bearings 3.Stator (cylindrical shell) Quick tips on motors: Quick tips on motors: 1.motors create a lot of heat, and to cool them down heat is transported through the fins to the fan which is the cooling agent. 2.The rotor and the stator form the heart of the motor. 3.We use a Y to delta connection because of the high voltage needed for starting (Y) and the the system goes to low voltage (delta). The project is about a correlation between vibration and electrical methods to find faults in motors. it’s showing whether combining the two methods is actually useful or not. The vibration method is well established and used in industry everywhere, but the electrical method has come into play recently for motors that are in hard to reach places, like under water or inside nuclear plants. Combining the two methods ensures as much accuracy as possible in finding the fault, and that is how the project was inspired The advantages of using the vibration method: Good operating and performance characteristics. Can detect all types of faults. Large quantity and variety of devices utilized. The advantages of using the electrical method: Being able to get measurements from long distance. Cheaper and easier to measure and store. Signals can be acquired from motor itself without the needing sensors. Motors BackgroundPurpose Types of Faults Covered in This Project: Pulley/belt to eccentric load Unbalanced Shaft Soft Foot Angular misalign Parallel misalign Broken rotor bar Voltage imbalance Current imbalance Bearing fault (BPI, BPO, BSF) Tools: The Explorer 4000: is the main device used to measure the vibration, torque, current spectrums. AC induction motors Accelerometers Bearings Bearing heating tool Dremel tool Electrical Faults Testing Bench Lovejoy coupler Torque spectrum of healthy motor Torque spectrum of imbalance. Overview: Types of Faults Covered and Some Tools Victor, Wowk, Machinery Vibration, New York: McGraw-Hill, 1991. Reflection Losses, Intergrated Publishing, [online] no date, http://www.tpub.com/neets/tm/108-2.htm (Accessed: 30 November 2013). Combining vibration and electrical is useful in most faults’ detection but not all. The Explorer 4000 is capable of using both electrical and vibration methods to detect motor faults. In some faults one of the methods did not work, which means that both methods should go hand-by-hand to be 100% sure about the final result. acknowledgements to: Craig Powers 1) 1)Imbalanced shaft: Both vibration and current methods work. 2) Damaged bearing: The vibration method worked but not the current one. 3) Misalignment: The current method worked but not the vibration one. 4) Voltage and Current imbalance: Both vibration and current methods work 5) Soft foot: The current method worked but not the vibration one. The Explorer 4000. Some ResultsConclusion References