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There is a maximum degree of 'skewedness' these laminations can adopt, and this is dependent on the design of the motor. This test is one of the most accurate and reliable tests on rotors for bar damage. Short circuit fault. This is all about how to troubleshoot mechanical and electromagnetic failure of squirrel cage induction motor, if you still want to know more information or buy related products at a discount, please contact us. The Influence of Select Losses Components on Induction Squirrel-Cage Motor Efficiency. The two primary assemblies within an induction motor are the stator and rotor; the stator and rotor are however built from smaller individual components. When a rotor bar is cracked, current will not be induced in it, changing the current to the rotor. The motor is to be always started and stopped at no load, The supply is switched on and the motor is started using a Direct On Line Starter (DOL Starter). Related Post: Separation of Losses. Therefore, the value of rotor resistance is extremely high.
The laminations do not follow a perfectly straight orientation, but are slightly skewed in order to increase the torque produced. The rotor shaft usually has a long and thin cylindrical shape, but this is design dependent. Damage and poor connections may also be at fault for any variances or performance issues. How to test a squirrel cage motor show. Ui (Uiph): terminal (phase) electromotive force. Test Value Static (TVS) is a sum calculated from the 3-phase MCA static test and is used as a reference value for the motor.
Capacitor start capacitor run induction motors - similar applications to capacitor start induction motors; an additional capacitor is installed for when the motor is in service (when the motor is running). How to test a squirrel cage motor city. However, older motors may have more serious obstructions that need repair or replacing. For example, plain bearings require more space, a form of lubrication (oil usually), and do not use spring washers or c-clip retaining rings. Polarization index (PI) testers (sometimes known as dielectric breakdown testers) are used to assess insulation health, identifying the accumulation of contaminants as well as physical changes within the insulation. Info - an overheated motor may melt the insulation around the windings and cause the motor to short circuit; this failure mode is unfortunately not uncommon but can easily be avoided providing adequate cooling is always provided.
Discharge before and after testing: Before beginning testing and after each electrical test, be sure to discharge the motor, as it has an inherent amount of capacitance. Contaminated windings – grease, dirt, liquids and corrosion. APPARATOUS REQUIRED: MACHINES DETAILS: THEORY: A squirrel cage induction motor essentially consists of a stator and a rotor. Copyright information. The connection diagram of the no-load test of an induction motor is shown in the figure below. Each of the three phases of the motor must be correctly wired to the incoming supply. How to test a squirrel cage motor puller. © 2020 Karabuk University. Electric motors are highly integrated machines that can develop faults in many areas and, if left unattended, a damaged motor can result in dangerous working conditions.
Line to Neutral Test: If there is an available neutral terminal, place one multimeter probe on that and the other on each of the line terminals. While the box is still off, take a reading between the T1 and T2 leads, the T1 and T3 leads and T2 and T3 leads. Phase to Earth Resistance: Take the insulation tester, using the same setting, and check each lead from phase to the frame of the motor. Vibrations in a motor modulate at a rate equal to the number of poles times the slip frequency, and vibration analyzers are used to see changes in vibrations potentially related to malfunctions. Check the nameplate: The nameplate or motor specifications provide valuable information about the motor, such as the intended amperage of the motor. Bolts are the 'male' part of a nut and bolt assembly. Slip ring induction motors - provide a high torque and low starting current; used for e. elevators, cranes, and hoists. In: Bertoldi, P., de Almeida, A. Motors and Transformers Final Exam Flashcards. T., Falkner, H. (eds) Energy Efficiency Improvements in Electronic Motors and Drives.
The experiment is repeated for different values of load currents till the rated current of the machine is reached. The ampere reading will not exceed the manufacturer's specification but should be at or slightly below the given amperage draw. AC Motor Winding Continuity Test. A good motor should result in a reading that is less than 0. Stator windings are usually manufactured from copper, although other materials are available e. aluminium.
These tests send pulses at increasing voltages up to the target voltage one phase at a time, generating them in such a way as to simulate startup/slowdown spikes. This test can also be used to balance 3 phase motors, as the phase-to-phase resistance of each winding can be compared to see how they differ from one another. Ur: terminal reduced voltage according to project IEC 2G/102/CDV. Phase systems are alternating current power supplies that are defined by the number of phases in the power supply. If there is higher resistance, the circuit is open. This article presented an understanding of the basics of electric motor testing. Having these tools available will help you avoid leaving the motor unattended. Thin steel laminations are slid onto the squirrel cage bars and compressed between the end rings; the rotor lamination materials involved are similar to those used for the stator laminations. The motor overload running phenomenon has dull sound, speed drop, motor temperature rise obviously, current increase significantly, etc. Any broken wires should be handled and replaced with care. The ampere reading should be within range if it is operating correctly. Dust shields may be installed between the shaft and end shields to prevent foreign particles from entering the motor's interior.
If the value is less than 0.