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Springer, Berlin, Heidelberg. The motor casing houses the stator and rotor assembly. The motor test parameters such as full-load, no-load, locked rotor torque, etc. Field testing & inspection of 3-phase squirrel cage motors - Resource Library. The purpose of the test in the motor routine testing is to calculate power factor, starting current and starting torque. PRECAUTIONS: - TPST switch is kept open initially. There are two main types of induction motor: single phase (1~) and three-phase (3~).
The readings of the voltmeter, ammeter, wattmeters and spring balance are noted down. Electrical motor testing evaluates static parameters such as insulation (the barriers between winding interconnections/winding to earth), wire damage, current leakage, and/or dynamic parameters such as balance, temperature rise, distortion, etc. The recorded temperature should not beyond acceptance range specified in test procedure or motor datasheet.
Phase loss operation. Note that these tests are typically done on off-line motors – that is, motors that have been removed from their power source, for safety and ease of inspection. The shaft key sits within this groove. Field/Domain - Testing Kit handling & Maintenance at Pan India level with extensive traveling.
The load on the machine is removed completely and the supply is switched off. If the value is less than 0. Skewing of the laminations also reduces the risk of the motor rotor 'locking' in a position between magnetic fields; this scenario causes the rotor to remain stationary and not rotate even when current is supplied to the stator windings. So, it is necessary to reverse the direction of current coil terminals to take a proper reading. Take each end and place it on different permutations of L1, L2 and L3 and record each reading. Cable Size Calculation for LT & HT Motors. Squirrel Cage Rotor Testing - Resource Library. Squirrel cage induction motor failure is mainly divided into two parts: mechanical and electromagnetic. The vector sum of the load and magnetising currents causes the voltage to lag, consequently yielding a low power factor. Bearing Vibration test is performed when the rotor running at the no-load condition and the velocity vibration amplitude shall be measured in horizontal, vertical and axial directions. The electromagnetic fault of squirrel cage induction motor is more complicated and various, mainly including: -.
The connection diagram of the no-load test of an induction motor is shown in the figure below. The two primary assemblies within an induction motor are the stator and rotor; the stator and rotor are however built from smaller individual components. Cheap and easy to install - squirrel cage induction motors do not contain brushes, slip rings, commutators, permanent magnets, position sensors, or other components that increase their overall cost. The most basic inspection is a visual inspection. The test involves positively charging the motor conductors and negatively charging the frame for ~10 minutes. Then, the voltage is increased to the 120% of the rated value at the rated motor speed. These readings should be the same if the motor is working properly. How to test a squirrel cage motor city. Generally, an auto-transformer is used to get variable supply voltage. Multiple lifting eyes may be used for large motors. In a no-load test, the motor is running without load. This checks that the incoming power supply is as expected and meets the design specifications of the motor. Enjoying this article? Most often, this indicates that the motor is burned out. When the motor stator winding is damaged by moisture or external impact, the insulation value of winding and stator core and rotor insulation material is greatly reduced or even zero, the motor case with a point cannot start normally, the machine temperature is greatly increased or even burned out.
There should be little to no variation between each lead combination. Before testing, it is important to check the amperage draw your motor requires — this will usually be on the nameplate. Also, be sure to disconnect all equipment and wiring that is not going to be included in the testing process. Induction Motors - What's the Difference? Single Phase Industrial Motors - How do they Work?
Induction motors – also known as asynchronous motors – are the most common type of electric motor used today. Skip to Main Content. It means that the three-phase asynchronous motor is running in the state that one phase winding is not working. Share: Electric motors may or may not be expensive to purchase, but they are almost always more expensive to repair. If the target voltage is achieved without any change in frequency on the graph, then the motor's turn-to-turn insulation is healthy, but any shifts in waveforms indicate weakness in that particular area. How to test a squirrel cage motor video. The stator contains the insulated windings for the three phases of the motor. In this test, the rotor is locked and it cannot move. The acceptance criteria shall be based on manufacturer approved procedure but usually phase to phase deviation should not be more than 2%, and max deviation from theoretical value should not be more than 5%. Each test can apply to most AC and DC motors, but each method of testing is dependent on the construction and application of the motor being evaluated. Low power factor during light load conditions – during start-up and low load, the motor requires a large magnetising current to overcome the resistance produced by the air gap between the stator and the rotor. AN ADVANCED SOLUTION FOR TESTING AC INDUCTION SQUIRREL-CAGE ROTOR MOTORS <1000V.
When the sensors are connected, take the ampere reading and turn off the motor. A sealed ball bearing allows the rotor to rotate without transferring the rotary motion to other stationary parts i. the motor housing. If it is the problem of power supply and fuse, use a multimeter to test, open the end cover, find the fault, re-weld and wrap the dipping paint to dry, then use after normal test; if it is the winding damage, replace the winding. Basics of Motor (and Rotor) Testing. Stator windings are usually manufactured from copper, although other materials are available e. aluminium. L terminals indicate line wires with incoming current, while T terminals indicate outgoing wires. Plain bearings also cater for higher loads.
Dust shields may be installed between the shaft and end shields to prevent foreign particles from entering the motor's interior. The type of rotor used in this example is a cage rotor (squirrel cage motor). As the rotor circuit is closed, a current flows through it. In the case of a squirrel cage induction motor, the rotor resistance per phase (referred to as a stator) is derived by subtracting R1 from R01. Mechanical (Rotor) tests. Connection Terminal. But practically it is never able to do so. D. strength of the magnetic field of the armature. The rated voltage and rated frequency three-phase supply are given to the stator winding of three phase induction motor. Test new and stored spare motors. The experiment is repeated for different values of load currents till the rated current of the machine is reached. End shields (end bells) are mounted at opposite ends of a motor's frame; the rotor shaft passes through both end shields. These electrical tests will find issues within the windings of a motor using resistance.
The shaft should rotate smoothly, with no catches or loose parts. Services are available that will do this testing for you, providing a professional evaluation with none of the hassles of testing your motor on your own. Electrical tests involve measuring the current, resistance, or electrical properties of motors, while mechanical tests often look for damage/defects within the rotor which can cause imbalance. Brushless DC Motor (BLDC) – Construction, Working Principle & Applications. The voltage between phases, current per phase and absorbed power shall be measured at each data point. Ui (Uiph): terminal (phase) electromotive force. Long service life - induction motors are considered to have a comparatively long service life because their parts are mechanically strong, resistant to corrosion and erosion, and have low wear rates. A fan guard protects the fan from large foreign bodies and protects persons or objects nearby from the moving fan blades. 732 times more power on the same current, resulting in a more economical system overall. Place the Sensors: Place the negative sensor of the multimeter to the negative terminal of the motor, then place the positive sensor to the positive terminal. IR testing can highlight dead cables, shorts, loose connections, open circuits, or any other blatant winding issue that can alter the winding resistance. Safe: De-energized testing.
Two-phase voltage can not start the motor, which often happens in the motor running state, will lead to the motor burning in a short time with heat and the power fuse fusing. The no-load resistance is also ignored in this test. Detects faults at the earliest stages before motor failure. The negative terminal will be labeled with a minus sign and have a connected black wire. A fan is used to force cool the motor.
As the name suggests, this test was performed without loading condition. Tip - the term 'induction' refers to the fact that electrical current is induced in the rotor cage when the motor is in operation; this differs to other motors where the rotor current is supplied from an external source. This curve is illustrated in the below figure. Boot loader function facilitates firmware updates at the customer's site. At this point, prepare your multimeter for testing. Due to the high magnetising current, the motor will also experience an increase in copper losses, which reduces its overall efficiency. The shaft key is the only connection between the rotor shaft and the load being driven, it is thus imperative the key can withstand the full load characteristics of the motor without failing. Note that there are many methods for diagnosing issues within a motor, and the ones presented in this article are only the most common tests used. From no-load test (IEC 34-2); from draft IEC 2G/102/CDV; from presented in this paper method.