From this voltage the actual resistances of the windings are measured. Additional notes about using a megger insulation tester 33. Ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. Synchronous and asynchronous electricmotors the electric motor is an electromechanical continuous energy conversion equipment that converts electrical energy into electrical energy mechanical energy. Motor current signature analysis mcsa is a proven and accepted method for determining the condition of a motors current carrying components. Fundamentals of alternating current 3 figure 121 sinusoidal wave values. Standard for acceptance testing specifications for. Each of these ac motors is different, but theyre all the same in one major way. Its operation is based on the principle that when a current carrying conductor is placed in a. Servo motor repair load testing servo motor drive testing.
The ac motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. That is, the motor shall not be dismantled to remove sealing elements. Prakasam and others published testing and analysis of induction motor electrical faults using current signature analysis find, read. Dropforged eyebolts per american society of testing materials a489 or equivalent must be used. Induction motor, no load test, blocked rotor test, vibration test. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy to mechanical energy, and vice versa. Vlf technology can be used for ac withstand and ac diagnostic testing. This section contains free ebooks and guides on motor control, some of the resources in this section can be viewed online and some of them can be downloaded. Abb offers two types of low voltage induction motor series. Knowledge of the basics together with powerful new test. Electric motor testing explained the electricity forum. Refer to the wiring diagram to verify the motor is wired correctly. Induction motor testing electric motor insulator electricity scribd.
But smart companies understands is that what this means for maintenance programs is billions of dollars of lost revenue through increased motor repair costs, downtime, and waste in. Other motors that are included are 1phase induction motors, permanent synchronous motors and synchronous reluctance motors. The ac motors can be divided in two sub categories, synchronous motors and asynchronous motors. Inspection and test procedures for rotating machinery. Motor guide february 2014 low voltage motors motor guide. If a seried dc motor has a laminated stator frame, it can run effectively htt l d iki di iki di 667 from an ac supply as well as dc, this is the. Induction motor testing and evaluation summary as energy costs rise, more emphasis is being placed on determining the health of large inductive motors. Use pdf download to do whatever you like with pdf files on the web and regain control. If your device is not working properly, you may want to perform some basic electric motor testing to diagnose the problem. Isbn 07389785 ss95211 no part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. Pdma corporation has developed these portable motor testers.
Testing of induction motor december 30, 2018 february 24, 2012 by electrical4u demand of energy is growing day by day and along with it cost of energy rising abruptly, so now it is necessary that the health of large motors which consumes maximum power should be taken care off. Ac induction motors are subject to many different failure modes. At servotech we are dedicated to providing the highest quality servo motor repair and refurbishment services, and have designed our servo repair process to ensure we return your. Companies across the globe trust our reliability solutions, products, and services. Test results of surge protection devices shall be in accordance with procedures for testing of lv surge arresters. Without going into the mathematical details, the wave shape of the induced emf can be explained by the fact that the rate of change of flux.
In this chapter, we shall focus our attention on the construction, working and characteristics of commonly used singlephase motors. Standard for acceptance testing specifications for electrical. Broken rotor bars, cracked end rings, high resistance joints bad welds excessive air gap. Web to pdf convert any web pages to highquality pdf files while retaining page layout, images, text and. Jul 06, 2016 a dmm digital multimeter, such as this keithley dmm7510 from tektronix, is a musthave instrument for motor testing. In this test, a rated, balanced ac voltage at a rated frequency is applied to the stator while it is running at no load. Recommended interpretation of iec 6003421 external contact seals at the drive shaft extension ends shall be removed prior to testing. Induction motor testing and evaluation plant services. Ieee std 1122004, ieee standard test procedure for. An ac motor is an electric motor driven by an alternating current ac.
Ieee std 1122004 revision of ieee std 1121996 ieee standard test procedure for polyphase induction motors and generators sponsor electric. Efficiency and loss mapping of ac motors using advanced. Ac dynamometers dynos provide accurate and repeatable dynamometer control under stringent operating conditions for various testing applications. Pdf test file congratulations, your computer is equipped with a pdf portable document format reader. Jul 01, 2015 basic motor testing with multimeters and ammeters july 1, 2015 by david herres 12 comments when an electric motor fails to start, runs intermittently, runs hot, or continually trips its overcurrent device, there my be a variety of causes. There are many types of ac motors, but this course focuses on threephase ac induction motors, the most common type of motor used in industrial applications. That a motor is synchronous means that the motor shaft is rotating with the same speed as the rotating magnetic field inside the motor whereas an asynchronous motor rotates. Whether testing small electric tools, large electric motors, offroad diesel engines, marine diesel engines or powertrain components, we have a system thats right for you. As this is a grundfos publication, it is only natural that we should pay special attention to motors used for pumps although much of the information contained within these pages. Yukon department of education box 2703 whitehorse,yukon canada y1a 2c6. The theory used in the work was collected by studying literature on how electrical motors work, and by simplifying the. An ac motor of this type may be part of a pump or fan or. Request pdf efficiency and loss mapping of ac motors using advanced testing tools the efficiency and loss maps represent an important tool to evaluate an electrical motor drive.
The redesign report with original and new winding data is output as an adobe reader pdf file and can be printed or saved. Section 7 of the ansineta standard for acceptance testing specifications for electrical power equipment and systems may be reproduced and used on a cut and paste basis for the particular type of equipment to be tested. Single phase magnetic induction motor with exposed rotor and coil after all, motors are always designed to carry out specific tasks. What is common to all the members of this family is that the basic physical process involved in their operation is the conversion of electromagnetic energy. Dec 30, 2018 testing of induction motor december 30, 2018 february 24, 2012 by electrical4u demand of energy is growing day by day and along with it cost of energy rising abruptly, so now it is necessary that the health of large motors which consumes maximum power should be taken care off. The no load test on an induction motor is conducted to measure the rotational losses of the motor and to determine some of its equivalent circuit parameters. Megger guide to electrical insulation testing pdf instrumart. Testing of increased safety ht induction motor for hazardous. Test procedure for polyphase induction motors and generators.
There are many types of ac motors, but this course focuses on threephase induction motors, the most common type of motor used in industrial applications. A 5 kvdc insulation resistance test is no substitute for a proper ac overvoltage withstand test. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. Aug 30, 2018 each of these ac motors is different, but theyre all the same in one major way. Ieee std 1122004, ieee standard test procedure for polyphase. For a four pole ac motor operating on 60 hz power, the synchronous motor speed is calculated as. Motordoc llc provides electrical machinery, electrical reliability and industrialcommercial consulting and training as well as the first continuous monitoring electrical and current signature analysis system and esa data collection systems.
Do not lift both the motor and driven equipment with the motor lifting means. Ac motor testing performed with pdma mce offline tester resistive imbalance during this test a dc voltage is applied to the motor. This standard provides the basic test procedure for evaluating the performance of a. The following sections of the ansineta standard for acceptance testing specifications for.
Module 8 ac reactive components this module describes inductance and capacitance and their effects on ac circuits. The three resistance readings of a threephase induction motor are compared and calculated to obtain the resistive imbalance. You should be able to view any of the pdf documents and forms available on our site. Synchronous and asynchronous electromechanicalsystems dr. Module 7 basic ac theory this module describes the basic concepts of alternating current ac electrical circuits and discusses the associated terminology. If the motor problems cant be resolved with this list, please contact your supplier for assistance. A wide range of dmms are available to measure voltage, current, and resistance, depending on the motor power ratings. Induction motor testing free download as powerpoint presentation. Servo motor repair load testing we service well over a hundred servo manufacturers, with rush services available for rapid spindle, ac and dc servo motor repair.
The ac motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a. Testing can be conducted without interrupting the normal operation of the motor, and in fact should be performed when the motor is under a minimum of 70% load. Electric motor testing dynamometer manufacturers, suppliers. Free motor control books download ebooks online textbooks. Sealing elements that can only be removed by dismantling the motor shall be left in place. Testing can be conducted without interrupting the normal operation of the motor, and in fact should be performed when.
Application systems is an iso 90012008 certified maufacturers, suppliers and exporters of electric motor testing dynamometer used for testing various motors electric motor testing dynamometer various dynamometers are offered for electric motor testing, ac motor testing, dc motor testing, fractional hp motor testing, air motor testing. Test results of motor starter equipment shall be in accordance with. But smart companies understands is that what this means for maintenance programs is billions of dollars of lost revenue through increased. Troubleshooting guide for singlephase motors continued problem possible cause suggested test tool corrective action motor overheats starting windings are when the motor is turned off, a distinct click should be heard as the centrifugal switch closes not being removed as the motor slows down. Custom motor test systems for ac motors, dc motors, aerospace motors, automotive motors, appliance motors, power tool motors, dentalsurgical motors and pump motors. Vlf use for motors and generators was first defined by the ieee standard 4331974, upgraded in 2009. Ac testing should be performed, not dc, or worse, no hv testing at all. Ac motors ac motors are used worldwide in many applications to transform electrical energy into mechanical energy. The ac induction motor is the most used electrical motor in industrial applications worldwide. This standard specification describes the requirements for the contractor to overhaul ashore in a suitable repair facility an alternating current ac induction or synchronous motor removed from a coast guard vessel. They all consist of one or more run windings and one or more start windings. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. Episode 4 single phase induction and shaded pole motors. Pdf testing and analysis of induction motor electrical faults.
992 1430 33 1129 1240 184 235 861 458 233 531 107 1064 1510 469 458 863 279 609 79 1481 326 697 79 512 185 1226 933 1560 1186 762 130 1246 17 1057 834 42 786 1190 736 1451 844 700 1486 940