Black band testing, setting the neutral, checking interpole polarity, bartobar testingthese and most other test procedures described in dc machine literature are diagnostic. Companies across the globe trust our reliability solutions, products, and services. Dc dmv automobile driver manual dc department of motor. Simple, lowcost dynamometer setup for motor testing part. The direct tests can be used only on small machines. Thus by decreasing the flux, speed can be increased and vice versa. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications. This test can be done in your own workshop using simple hand tools and a. The complete guide to electrical insulation testing. Dc spindle drive problems are often caused by motor problems. The load testing of dc machine is needed to determine the rating of a machine. Basics of dc motors for electrical engineers beginners on photo. What are all the tests conducted on dc generator and dc. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor.
The brush face must be shiny and conform to the arc of. Ieee std 1122004, ieee standard test procedure for polyphase. An electric motor powered by direct current where the field windings are connected in series to the armature windings. Testing and commissioning procedure for electric motors eep. So obviously the speed of an induction motor can be controlled by varying any of three factors namely supply frequency f, number of pole p or slip s. For example, the control of a rotary inverted pendulum requires a dc motor to drive the arm and the pendulum as shown in figure 21. In this method, the dc machine is loaded directly by means of a brake applied to. Ieee std 1122004, ieee standard test procedure for. Inspect bolted electrical connections for high resistance using one or more of the following. I have been working with dc motors,drives etc for over thirty years. Experiment 5 dc motor speed control walter scott, jr. In direct method of testing the generator or motor is put on full load and whole of the power developed by it is wasted.
Implementing a predictive maintenance program takes a pm program to the next level. Testing of dc motor, dc motor testing direct and indirect method october 28, 2015 admin 0 comments. Very high electromagnetic starting torque of dc motor is produced by virtue of the high starting current, which has the potential of producing huge centrifugal force capable of flying off the rotor winding from the slots starting methods of dc motor. Custom motor test systems for dc motors, aerospace motors, automotive motors, appliance motors, power tool motors, dentalsurgical motors and pump motors. Motor and motor control troubleshooting techniques. The most common method used to check for shorted windings is to perform a drop test. The test generally applies between 100 and 5,000 v or more. The speed of an induction motor is given as n 120fp 1s. Inspection and test procedures for rotating machinery. We are constantly doing what everyone else just talks about. Visual inspection and electrical testing of the armature and fields give the maintenance personnel an understanding of the condition of the motor.
Their purpose is to search out defectsshorts and opens in the armature winding, improper field connections, or commutator problems. Pdma corporation has developed these portable motor testers. It is already explained above that the speed of a dc motor is inversely proportional to the flux per pole. This manual provides information on safe driving rules and practices all drivers should know and on all aspects of driving. Ieee standard test procedure for polyphase induction motors and generators 3 park avenue, new york, ny 100165997, usa. Give a dc voltage across the commutator segments for one pole pitch area from a power supply or battery. Maintenance tester for deenergized motors, generators and windings 8.
How to make dc motor at home, homemade electric motor easy s. Testers for electric motors and all kinds of windings schleich. The latter boosts the signals to power levels required to move the motor. Pdma corporation is the leader in the field of predictive maintenance, condition monitoring applications, and the development of electric motor test equipment for motor circuit analysis.
Figure 2 shows the test setup for torque measur ement. Methods for characterizing and tuning dc inrush current. Simple noload evaluation techniques confirm the predicted motor constants without large, expensive test equipment. The paper also describes a detailed procedure of design. Gather up any background material you may have on hand and then use your senses to inspect the site. To know how to estimate and predict efficiency of a d. Testing of machines is used for finding losses, efficiency and temperature rise. Connect positive end of the dc power supply at one end and the negative end at the opposite end. Motor current signature analysis mcsa is a proven and accepted method for determining the condition of a motors current carrying components. Precision positioning systems are fundamental components in industrial machines such as machine tools, measuring machines and semiconductor manufacturing systems. Whilst using meter and megger meters check out the continuty and grounds it cannot really check a dc motor out propelly. Finally, connect a known good motor to a variable voltage power supply. The dc motor or direct current motor to give it its full title, is the most commonly used actuator for producing continuous movement and whose speed of rotation can easily be controlled, making them ideal for use in applications were speed control, servo type control, andor positioning is required. Basics of dc motors for electrical engineers beginners.
What really matters is the trend in readings over a time period, showing lessening resistance and warning of coming problems. Its operation is based on the principle that when a current carrying conductor is placed in a. A dynamometer is a testing device that helps engineers collect data for various mechanical loading conditions that. Knowing some basic methods and techniques along with having a. Testing these aspects of a motor often mean supplying known controller motion profiles and verifying the output signals of the controller and the drive. Starting methods to limit starting current and torque of. Thorough testing of every dc motor we build is conducted at our manufacturing plant in round rock. A bad motor can sometimes stick, or feel like its got a lot of friction. Before you send your drive to be fixed, test your spindle motor.
If you have a dc motor that is malfunctioning or drawing and bleeding power through the wires, there are tests that can be done to test the efficacy of the dc motor. The paper deals with experimental method of dc motor friction identification. A protocol involving voltage level, time duration, intervals between tests and connection methods must be composed, taking into account the type and size of the equipment, its value and role in the production process and other factors. No load or open circuit test is done to determine the magnetizing characteristics of a machine ma. Understanding insulation resistance testing pdf0712 technical assistance 800 34391. Assuming the field source in your spindle drive works. Motor company dc motors and generators combine timetested. As a direct consequence of the two above mentioned facts i. Dc motor fault zone analysis is a vital part of any dc motor maintenance program. Pdf accurate modelling of permanent magnet pm dc motors is a prerequisite for.
Experiment 5 dc motor speed control it is prefered that students answer the questions before doing the lab because that provides the background information needed for this lab. They can be quite different for one motor or machine tested three days in a row, yet not mean bad insulation. Maintenance tester for deenergized motors, generators and windings. Use engineering methods and mathematical models in an effort to most closely match dc.
Methods of rewinding testing the new winding testing of armature. Testing of dc motors electric motor electric generator scribd. Siemens dc motor test run on dc motors test stand rgb elektronika duration. Turn the voltage up slowly from zero, up to the motors rated voltage. Our test facility is one of the most advanced in the world. The performance of the machines depends on the positioning systems. A motor or a generator can be represented by a equivalent circuit, the tests are done to determine the parameters of that circuit. If a machine produces too much heat then it can affect the insulation of the machine and ultimately it can cause the breakdown of the machine.
That is, with the same test connections and with the same test voltage applied for the same length of time. You will not be permitted to refer to this manual while. Lesson 3 understanding and using dc motor specifications. Pdf analysis of a pm dc motor model for application in feedback. What i have done is actually built a test jig to apply actual voltages to both field and armatu,re.
Testing of dc motor, dc motor testing direct and indirect. Speed control methods of dc motor speed control of shunt motor 1. Testing of dc machines can be broadly classified as. Modeling of dc motor the most common device used as an actuator in mechanical control is the dc motor. Testing methods and techniques to avoid accumulation of charge from the electron beam. Brake adjusting the tension of belt, the load is adjusted to give the various values of currents. For an ac induction motor, the starting torque is less than the max output torque of the motor and must be accounted for in order to get proper operation. This introduction is not part of ieee std 1122004, ieee standard test procedure for polyphase induction motors and generators. In this method, the motor is put on the direct load by means of a belt and pulley arrangement. This is the first in a series of information booklets that will support electrical testing in the. Home technical articles testing and commissioning procedure for electric motors scope of motor testing it should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. For a dc motor, is there enough current output in the system to supply the startup torque.
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. No matter how urgent the problem and motor failure can cause some very urgent problems always develop a plan of attack before you start repair work. Testing can be conducted without interrupting the normal operation of the motor, and in fact should be performed when. Timeresistance testing method this method is fairly independent of temperature and often. Design and prototyping methods for brushless motors and. Rgb elektronika centrum automatyki przemyslowej 5,200 views. If you do not read and study this manual, you may not pass the knowledge test required to obtain a dc dmv driver license. Perform dc dielectric withstand voltage tests on machines rated at 2300 volts and greater in. For a dc motor armature, there is a simple method of determining the condition of the armature. The pm dc motor has windings on the rotor assembly and permanent magnets for the stator assembly.
Pdf electrical motor testing station with electromagnetic load. Methods for brushless motor controller design and prototyping are also presented. Condition assessment of dc motors requires a basic understanding of the. Brake test on dc shunt motor another method of testing the d. If youre interested in hardware product testing methods in general.
Dc motor analysis pdma a leader in electric motor testing. When we run a machine, then some energy is lost in the machine, which converts into the heat and cause temperature rise. It is a direct method and consists of applying a brake to a watercooled pulley. The result is a high standard of quality control that reinforces our manufacturing excellence. Manual or fully automatic high ease of use and very. With its 14 different test methods the allinone motoranalyzer2 offers almost. The main methods employed for speed control of induction motors are as follows. Rapid prototyping methods for brushless motors prove to be useful in the fabrication of the case study motors. Dc motors designed for your application dc motor applications.
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