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The accelerometer measures vibration acceleration and not velocity, if used, the software converts the acceleration to the velocity by applying the calculation. Once this is removed, you can start to check the motor for visual indications of damage. CSA Standard C390-M 1985. Three-Phase Testing Procedure. The washer also prevents the nut and bolt from 'digging' into the metal surfaces when being tightened. Polarity Test of a Transformer – Circuit Diagram and Working. 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. Generally, an auto-transformer is used to get variable supply voltage. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. How to test a squirrel cage motor symbol. Did you find this article useful? If the motor has a short circuit between turns, there will be obvious electromagnetic noise, obvious heating of the winding, and even smoke and scorching smell. Perfect for testing new and repaired motors prior to acceptance. Mechanical motor testing often includes evaluating a motor's rotor for cracks and shorted laminations.
Direct Online Starter – DOL Starter Wiring Diagram for Motors. Next, examine the inside of the motor and the wires involved in the three-phase current. Before motor testing, however, be sure to take appropriate safety precautions. At this stage, note down the record of the voltmeter, ammeter, and wattmeter. The shaft key sits within this groove.
What is a Wound Rotor Motor and How Does it Work? Also, most of these tests are used in conjunction with each other to verify results, as well as provide the most accurate picture of motor health. Types of Inductors and Cores. The course has a quiz, handbook, and you will receive a certificate when you finish the course. As the supplied voltage is zero, the stator copper loss and core loss become zero. Poor starting torque - based on their design, induction motors typically have a low starting torque, a side-cost of their high efficiency. Use of this web site signifies your agreement to the terms and conditions. A sealed ball bearing allows the rotor to rotate without transferring the rotary motion to other stationary parts i. the motor housing. If this happens, it means that there is some issue with the generated magnetic field, and therefore some mechanical issue with the rotor. Method for determining losses and efficiency of three-phase cage induction motors. How to test a squirrel cage motor service factor chart. 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.
The casing must be strong enough to withstand the electrical and mechanical stresses generated by the motor as well as the physical demands of its working environment e. severe weather. The lifting eye allows moving of the motor using a strop, rope, crane, chain block or cable etc. Types of Motor Controllers and Drives. The supplied voltage (line to line) is Vs. And due to this voltage, the current cause in the stator winding is Is and the total input power during the short circuit test is Ps. Patented Test Value Static™ (TVS™). Image credit: Test Devices, Inc. What is motor testing? How to test a squirrel cage motor parts. Info – larger motors do not use anti-friction bearings, they use plain bearings. Sumpner's Test or Back-to-Back Test on a Transformer. Any cracked rotor bars will increase the amplitude of vibrational frequency when the load is increased. The gasket is 'squeezed' between the two metal surfaces in order to create a sealed space. This may appear in the form of burn marks or indentations. Since there are many ways in which a motor can fail, there are at least as many (if not more) ways to test a motor's integrity.
This should be easy unless the motor is especially large. Types of Testing For 3-Phase Motors. Squirrel Cage Rotor Testing - Resource Library. Attached to the non-drive end of the rotor shaft is an axial fan; when the rotor rotates, so too does the fan. Difficulty achieving speed control - as a three-phase induction motor is a constant speed motor, it naturally undergoes very little in the way of speed variation, making manipulation of its speed difficult.
Speed Control Methods of of a DC Motor. As the name suggests, this test was performed without loading condition. Basics of Motor (and Rotor) Testing. The stator is the stationary part of the motor and consists of a housing with slots and a series of windings. It is a simple test that is non-invasive and provides basic information about current leakage, winding faults, and excessive contamination, but due to its low voltage, some faults will go undetected. The tests must be completed as follows: - Phase Resistance: Take the insulation tester and set it to 500V.
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