Find the percentage slip and number of poles of the induction motor. Rigidity and <> 1 0 obj In this case, power flows from the mechanical system, to the rotor circuit, then across the air gap to … The three-phase current is unbalanced. Numerical Problems Induction Motors . • AC induction motors are also the most common motors used in main powered home appliances. <>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 720 540] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 3 !1AQa"q�2���B#$R�b34r��C%�S���cs5���&D�TdE£t6�U�e���u��F'���������������Vfv��������7GWgw�������� 5 !1AQaq"2����B#�R��3$b�r��CScs4�%���&5��D�T�dEU6te����u��F���������������Vfv��������'7GWgw������� ? stream If the voltage is good, go to Step 2. The 3-phase stator winding is wound for a definite number of poles as per the requirement of speed. Generating, n. m > n. s. indicates that if the power converted is negative, so is the air gap power. %PDF-1.5 <> The induction motor sound is abnormal. 2003:01:01 00:00:47 2003:01:01 00:00:47 L (SVPWM), Three phase induction motor (3 phase I.M) I.INTRODUCTION . b) Unbalance incoming 3 Phase voltage to motor. Before troubleshooting the 3 phase induction motor, we must have to know about the 3 phase induction motor, star delta starter and it’s connection diagram. 6 0 obj In two-phase operation, there is a buzz sound. It works on the principle of Induction Motor. -phase Induction Machines Dr. Suad Ibrahim Shahl . The three phase induction motor is the most widely used electrical motor.Almost 80% of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction, low cost, good operating characteristics, the absence of commutator and good speed regulation. 2. endstream endobj For this motors, we require three phase power supply, whereas thus three phase Power must be supplied in a sequence. The rotor will constantly be turning to align its magnetic field with that of the stator field. Consider the working of a motor for a better understanding of these indicators. How to check a 3 phase motor system. 2) Supply Voltage Is Low (Less Than 415 Volt In Any Of 3 Phases). 7 0 obj Greater the number of poles, lesser is the speed of the motor and vice-versa. View Homework Help - Induction Motor Solutions.pdf from EE 4701 at University of Minnesota, Morris. )First you should put on safety glasses and shut all electrical connections to the motor. <> THREE PHASE INDUCTION MOTORS TECO-Westinghouse Motor Company 5100 North IH-35 Round Rock, Tx. <> Testing a three-phase electric motor without a trip down to the repair shop requires a cautious approach, but happily all you need to start with is a volt-ohmmeter and some simple hand tools. Three Phase Induction Motors: Types, Construction and principle of operation, 3 phase Induction Motor, general phasor diagram, equivalent circuit, power and torque relations, condition for maximum torque, circle diagram, Performance characteristics, effect of rotor resistance on speed torque characteristics, stable & unstable region of endobj (b) A massive concrete foundation is preferred in order to minimize vibration. <>>> This addresses the 3 phase motor in the system. PRACTICE PROBLEMS ON INDUCTION MACHINE 1. The principle of rotating type phase sequence indicator is like that phase motor. Set the voltage setting of the insulation resistance tester to 500V. 4. Hi fellows! Problems and premature failures often indicate input power system troubles, poor or deteriorating mechanical installations, or malfunctions in the driven machinery. dU ¯v¥rÑ5Æ Tÿ¡ñàêÜ*ÙÖì »zX5pÔ~È6^@cÁºM«¾MFeÕH! Step 1 Take input voltage to the motor using the volt ohmmeter. In general, the following applies for motors with an output of // Pe ≤ 10kW They do not require a special phase failure protection, as long as the two-phase trip current is ≤ 1.25 Ie.In this case, the warming up is, at the most equal, to the warming up during a symmetrical, three-phase load. 3 phase induction motor have 3 winding; assume U, V and W. This must then be 78681. 3.2.3 The foundation of vertical induction motors: (Also the foundation of pump) (a) Foundation of motor/pump must be rigid and secure to provide adequate support. Advantages of 3 phase induction motor • Generally easy to build and cheaper than corresponding dc or synchronous motors • Induction motor is robust Methods of Starting Three Phase Induction Motors As we know, once a supply is connected to a three phase induction motor a rotating magnetic field will be set up in the stator, this will link and cut the rotor bars which in turn will induce rotor currents and create a rotor field which will interact with the stator field and produce rotation. This troubleshooting guide can also be applied to other types of three phase induction motors: Restart the motor after shutting down. Three-Phase Induction Motor Revised: April 11, 2013 8 of 10 Vmot L-L Imot RPM Torque Vd Id 208 V 1.2 A 208 V 1.25 A 208 V 1.3 A 208 V 1.35 A 208 V 1.4 A 208 V 1.45 A 208 V 1.5 A 100 % Voltage Line-to-Line b) Repeat part “a” using 90% of rated voltage. Outer frame and stator of three-phase induction motor. • The three-phase induction motor is the extensively used for various kinds of industrial drives. �� �� � � � ÐctûW¥¬Î]w¥lÕôçN8ú¶Ë¹LÞË> The speed control of three phase induction motor is essential because the motor control industry is a dominant sector. �� 0100� X� � � � � � �� ' � � � � � 22 . Check from phase to phase … If not, check supply circuitry, breakers and condition of the motor's power cord. �T�I%)$�IJI$�R�I$���I%)%K�u����� n�=�����[?����⭉��ٞ�^�K]��V�dH����?�%ߘi�$�H%I$�JRI$���I$����T�I%)$�IJI$�R�Ig_��]%�z�i�ECw��7���� �߽%:),+~��$S���� ��X�ʝ�Z�F����������(�X��u��)��ZYm`���S��ϭ]M��x�yY�M�dc_��=�����v��r�3��^uF�����ld1��w�}��n�A�T�M�Xlǰ�X�=C���o����z{��rw��G��^tz�Uo�� ���7)��q~E��O�d\�7]��hp���t��?��H"絻��k͡�?Kkl����^ǢtߴV�1����u6���}�������� F�R�*������GZ�c�r�@p� �twg\ݷ�� ױ��?\:wX�b�qs��Ċ����o������]��{i ۼ�I$����T�I%)$�'^���kq��[qf�=��Ik~����?�J���0�M�X}���O�Ϥ�G��.99:��u�ť����{\��6��T?�9�M�Y�Y�W�{�em-�z���{��J��[�K�`��eLɵ� �ԑR�� 5��*ٮ�my�E�� ����?�5 �An��F�. If the motor doesn’t rotate in two-phase operation, find the reason for phase loss and eliminate it. The motor-specified voltage must be present on all three phases. One dynamometer with torque controller . One single-phase wattmeter plus miscellaneous apparatus as needed . 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