What details a motor nameplate shows and how to use them. Dc motor nameplate details explantion electrical4u. Motor 1 specification 12v dc motor solutions cubed, llc. The speed of the motor will increase if the armature voltage is higher than shown on the nameplate 2. Understanding electric motor nameplates1 understanding the information provided on an electric motor nameplate and how to use the information is important. As an example, a generator serial number might be p4w00236d05045, where.
Note similar nameplate letter designations also represent other motor characterisitics. Keeping the language common among manufacturers is critical to making motors interchangeable the u. When i read the armature voltage signal lets say, should i compare its rms or dc value to the nameplate. Figure 1 is a drawing of a typical induction motor nameplate. It is a treasury of important information about a motor. The electric motor efficiency is defined as how efficient it is. Classification of dc motor is more common than we may think. Since the code letter has been selected in alphabetic. The motor manufacturer may include additional information, such as the wiring information shown. Finally, some nameplates may even include data like bearing identification numbers, certification code, manufacturer serial number, and symbols and logos. Electric motors for explosive atmospheres instructions manual for installation, operation and maintenance of electric motors date. At 60 hz, a 4 pole motor will rotate at approximately 1800 rpm 72004 poles.
Aug 22, 2014 how to read motor nameplate data galcotv. What do all those things on an ac motor nameplate mean. A replacement motor with a higher code letter may require different upstream electrical equipment, such as a larger motor starter. The speed may also be higher if the applied shunt field voltage is lower than the value shown on the nameplate. In north america, the national electric manufacturers association nema sets. Probably what jrwb4gbm means is that the field windings are split into two separate sections, each rated 4amps and 150v. Be sure the motor is connected as shown on the nameplate diagram, and that the power supply voltage, frequency, and number of phases corresponds with the nameplate data.
Motor stator resistance ohms dc resistance of the stator between any two phases. Transformer nameplate details explained electrical academia. Nema specifies the information that must be included on the motors nameplate. The electric motor nameplate contains a variety of information that can be used to calculate other items. Electric motor nameplate details explained induction motor. Read the nameplate carefully to avoid misinterpreting the code, design, and insulation class. Dec 17, 2011 the motor s full load efficiency is shown on the nameplate, and it is often less than the actual maximum efficiency. Motor nameplate is normally located on all produced electric motors. Armature amps of course will be low since they have little to do with speed.
Reading a motor nameplate can sometimes pose a unique challenge. Electric motor nameplate details explained induction. Motor 1 specification 12v dc motor features 12v 200rpm 3. Nameplate data for different equipment types motors. In previous posts, weve talked about some nuances of motors in sanitary applications see our post on jm frame motors and motor efficiencyenclosure type s, as well as 3 phase motor control. In order to fully understand the details presented on motor nameplates well examine. Understanding these information can be hard sometimes, but is essential. You should then be able to measure about 440vdc on the armature, confirming nameplate data. The nameplate for a twopole 15 kw motor may have the following important data.
The rpm listed on the nameplate is the shaft speed for the motor. We have all seen the motor nameplate attached on the motor side or on top. Jan 09, 2014 every sanitary pump needs some kind of a motor. If you specify, buy, maintain, or replace motors, you should know how to read them by going through this post. They come in three different types, classified according to the electrical circuit used.
Nameplate data is the critical first step in determining motor replacement. How to read electric motor nameplate data learning. You will need information from the motor nameplate throughout the life of the motor. Electrical input voltage the voltage at which the motor is designed to operate is an important parameter. Electric motor can feature a metal silkscreen printed andor punched nameplate or an adhesive label glued on metal support. By its very nature, the transformer will have more than one rated voltage, depending on which side we are looking at and how many windings there are on that side. Understanding motor nameplate information nema vs iec standards. Each motors are manufactured with its specified details. The nameplate always indicates the size of the transformer in terms of how much apparent power rated kva it is designed to deliver to the load on a continuous basis.
Maybe this is a silly question but i am not sure, can somebody help me. Maximum motor efficiency typically occurs between 70 percent and 95 percent of full load, and most nema motors can be operated as low as 60 percent of full load without any significant loss in efficiency. North america, europe, japan, africa, has different standard. Search weg specificationofelectricmotors 50039409manual. Now just run the motor on the dc field weakening control drive of your choice, up to 1400rpm with a solid 2. Most manufacturers display information differently, and nameplates often get dirty, damaged, and occasionally are removed. The motor manufacturer may include additional information, such as the wiring information shown on the left side of the nameplate. The national electric code requires that motor nameplates include the following information in addition to the manufacturer. Iec standards the motor standards can be grouped into two major categories.
Run the motor without load to check the connections and direction of rotation. A power factor close to unity 100% is most desirable. If not specified, it can be measured using a truerms clampon ammeter. Dc motor is nothing but a direct current motor which is designed to operate in direct current. This reactive component is undesirable the utility company must supply it, but it does no work. It doesnt matter whether its the brain freeze ice cream factory or joes garage. Hi all i am a bit new to this worl, i recently graduated. The table value ensures that no matter what motor is installed, the conductor and branchcircuit, shortcircuit, and groundfault protective devices are sized to. Threephase motor nameplate layout threephase motor filledout example singlephase motor nameplate layout singlephase motor filledout example m series standard iec electric motor identification technical. The field on this nameplate is a shunt, not a series field.
Understanding induction motor nameplate information. By edvard authoravatar august, 29th 2015 27 comments save to pdf. The common language of the motor nameplate enables installation and maintenance personnel to quickly understand and recognize exactly what type of motor theyre dealing with during a new installation or replacement procedure. If not specified, it can be measured with an ohmmeter. Hi all, i have an older 200 hp reliance rpm dc motor stab. In north america, the national electric manufacturers association nema sets motor standards.
That simply means that it is wired as a separate circuit from the armature. Understanding induction motor nameplate information by ed cowern, p. In north america, the national electric manufacturers association nema sets motor standards, including what should go on the nameplate nema standard mg 110. Dc motors, installation, operation and maintenance manual. Overview this user manual applies to nord motor products and it provides general information for motor operation, installation, maintenance, inspection, repair, and trouble shooting, which is relevant to most of the motor products shipped by nord. The details about the motor is given in the motor name plate. The fullload current values for nema motor horsepower ratings found in tables 430. Nameplate data a critical part of making motors interchangeable is ensuring that nameplate information is common among manufacturers. Unit 16 electric motors washington state university. Jan 22, 20 how to read motor nameplate every motor nameplate must show basic data such as voltage, full load ampere f. This can make reading a motor nameplate a difficult or frustrating task.
Jan 31, 2017 you might have seen that in order to start a high power rating induction motor, a starting technique called stardelta is used. All motors have a permanent nameplate which lists all important data, further data is usually available in the motor catalogue. The nameplate provides the power factor for the motor at full load. It may be necessary to replace an electric motor in the future, and nameplate information in needed to make sure the replacement motor is acceptable for the application. The following information provides a brief definition and some application considerations regarding motor data on the nameplate. Understanding nameplate information can be hard sometimes, but is essential. Understanding motor nameplate information nema vs iec. Motor nameplate information required by nema standards wiki. Check the motor nameplate to be sure the voltage and type of power rating is the same as that of the power source. What does all of the information on a motor nameplate mean.
If the motor operates below this altitude, it will run cooler. In this we are going to see how to read or understand about dc. Check out this video for a close look at motor nameplates for galco tv. In addition to this required information, motor nameplates may also include data like frame size, nema design letter, service factor, fullload efficiency, and power factor. Rated voltages rated fullload amperage at each voltage level fla frequency typically 60 or 50hz phase single or three phase. Dc motor nameplate info dc motor nameplate info johnnyw electrical op. Understanding motor nameplate information nema vs iec standards course content the motor standards can be grouped into two major categories. A car may have as many as 20 dc motors to drive fans, seats, and windows. Electric motor nameplate details explained electric motor. This data tells you at which voltage the motor is made to operate. Virtually every factory and shop has one thing in common. Motor nameplate informationthe service factor on a motor nameplate indicates how much above the nameplate rating a motor can be continuously loaded.
Nema specifies the information that must be included on the motor s nameplate. The speed of the motor is directly related to the frequency of the line voltage and the number of poles in the motor. I am working on power quality analysis of a dc motor 800kw. In most countries it is a requirement for manufacturers to display all information on the motor s nameplate, but often this is not the case. In order to fully understand the details presented on motor nameplates, well examine each. If applied voltages are in accordance with the motor rating, there is a defect in the winding. Unit 16 electric motors objectives after studying this unit, the student will be able to state the purpose of an electric motor. This manual covers squirrel cage rotor motor where the rotor.
1157 483 1065 1439 309 172 609 640 1403 621 778 888 922 1141 361 559 547 344 946 1134 1050 77 1409 1488 1210 1432 601 557 717 109 1200 188 35 1371 721 1393 816 1269 682 968 1002 654 726 594