Motor vibration shall be measured in a triaxial direction, i. Supplement to ansinema mg 12016 adds testing methods for. Electric motor testing explained the electricity forum. The supplement serves as an expansion to these by adding testing methods for a particular motor type. As with the stator, also the rotor core consists of electrically laminated steel sheets. Little information is available on the market for these motors nor is measured efficiency data. The electric energy that is input into the device is converted to mechanical energy by the motor.
Big water pump station figure 3 projected average day power usage, 2011 projected average day flow 0 200 400 600 800 1200 1400 1600 1800. The efficiency of electric motors eem laboratory accreditation program was originally developed at the request of the national electrical manufacturers association nema to assist the electric motor industry in complying with the statutory requirements for electric motors in section 431. Thus, a 10horsepower hp motor has an acceptable load range of 5 to 10 hp. Iec 6003421 standard on efficiency measurement methods. The rated current stamped on the motor rating plate will be slightly higher to comply with the new efficiency testing standard. Motor efficiency is the most important factor to consider in the development of implantable devices such as ventricular assist devices vads and total artificial hearts tahs. Premium efficiency motor selection and application guide i acknowledgments the premium efficiency motor selection and application guide and its companion publication, continuous energy improvement in motordriven systems, have been developed by the u. Evaluation ofmarkets andefficiency offractionalpolyphase. Iec 6003430 standard on efficiency classes for low voltage ac motors iecen 6003430 standard was published by the international electrotechnical commission in october 2008.
Electric motor efficiency under variable frequencies and loads orgreportspdfr06004. Stator resistance losses w1 are the losses in the stator windings equal to 1. Motor current speed analysis implementation example as shown, mcsa is a key tool to evaluating the health of inductive motors it also can be automated for more efficient testing. The efficiency of a dc machine depends upon its losses. This is the product of a motors efficiency and power factor. Electric motor efficiency under variable frequencies and loads. How does abb apply the new edition of the standard. If you want to completely characterize a motor, you will need to test it with multiple input voltages and different loads. New testing approach matches real world conditions traditional motor testing methods the traditional method for measuring electric motor performance and efficiency is well defined, but the process can be costly to setup and difficult to apply in working processes. How to measure brushless motor and propeller efficiency.
The motor documentation must state which method was used. Test methods for determining the impact of motor condition on. Seshank malap demonstrates how to test efficiency on a three phase pwm motor drive using the tektronix pa3000 power analyzer and pwrview software. The smaller the losses, the greater is the efficiency of the machine and viceversa. Pdf australianled developments in electric motor energy. This article mainly deals with the determination of the efficiency curve. Energy efficiency considerations in pumps and pump stations. Motor losses there are, in general, five components of motor losses, as follows.
The standard defines efficiency classes for motors and harmonizes the currently different requirements for induction motor efficiency levels around the world. The speed of an ac motor depends on the frequency of the input power and the number of poles for which the motor is wound. This unwanted induced current is also called eddy current. Electric motor is a type of machine which converts electrical energy into mechanical energy using the interaction between magnetic field and current in its winding to producegenerate force in the motor.
Efficiency testing on a three phase motor drive youtube. Electric motor efficiency testing under the new part 431. Super premium efficiency motors provide the greatest energy savings in applications where the motor is fullyloaded, operates constantly, and is a replacement for. Industrial grade motors usually are rated for continuous duty. The majority of these electric motors are squirrel cage induction motors, and it is to the efficiency testing of these motors that this paper is directed. More information is specified in the menzel motor documentation. These values are intended to represent the lowest point in the bell curve of motor efficiency distribution. Since 2014 the power range was extended for electric motors and was set between 0,12 kw and kw. Manring 17 describes the details of handling uncertainty and suggests that ef. 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. A slightly less efficient motor can be worthwhile, if it increases the efficiency of the motor drive. The amount of power out of a motor is dependent upon its efficiency figure 6. If we actually reverse this process then mechanical energy is converted into electrical energy and that is done by generators.
It is the authors opinion that as long as a dynamometer is available with an inline shaft torque transducer, ieee 112, method b is a gold standard of motor efficiency testing. There are different efficiency definitions that describe the relationship between a motors rating and efficiency test results. It should be noted that the scope of motor testing depends upon the motor type and size, this being indicated on the inspection forms. The losses in an induction motor are distributed as follows.
Measurement of motor efficiency is only valid for a certain test setup. This refers to the efficiency measured by a specific standard. C39211, testing of threephase squirrel cage induction motors during. We recommend that you survey and test all motors operating over hours per year. Since the induction motor consumes about 90 % of all the. Australianled developments in electric motor energy efficiency testing conference paper pdf available june 2012 with 6 reads how we measure reads. Determining electric motor load and efficiency energy. Department of energy doe office of energy efficiency and renewable energy eere with. Rishel 2003 notes that considering the thousands of variablespeed motors that are installed each year, it is the writers opinion that an independent organization such as nema or ieee. Pdf test equipment for determining performance of electric motors. The motor is run at rated voltage and frequency without any shaft load. Motors, efficiency, and adjustablespeed drives power. For a 75 kw 100 hp motor, the super premium efficiency performance requirement is 96. Motor efficiency and fault zone analysis written by noah bethel, vice presidentproduct development, pdma corporation.
Testing and commissioning procedure for electric motors eep. Singlephase and small motor standards in north america. 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 industrial and commercial companies. Aim of measurment of motor efficiency on a test rig is to obtain efficiency data for similar motors, equal test setup. Motors used in testing and their nameplate specifications 7. The performance and efficiency of hydraulic pumps and.
This lack ofdata is in part related to the absence ofaccepted efficiency test procedures, orthe inclusion of efficiency in motor standards. Iec standards for electric motors magnetic innovations. A manually operated motor testing station provides students an opportunity for handson laboratory exercises in determining efficiency and. Ansinema mg 12016 also describes testing procedures for determining a fabricated motors capabilities. Obviously, for the motor repair industry, the segregated. American council for an energyefficient economy motor summit 2007, zurich 10 april 2007. New testing approach matches real world conditions. Governmentprintingoffice forsalebythesuperintendentof andtechnology washington. Motor efficiency, selection, and management xcel energy. The excess energy is dissipated as heat into the surrounding tissue and blood. Rated power depends on class of motor which considers intended duty. Motor guide february 2014 low voltage motors motor guide.
The efficient use of electricity is not just a nice to have. Electric motors performance analysis testing tool demonstration project, pacific gas. This seems in contradiction with the theoretical definition of the efficiency. A motor s efficiency tends to decrease dramatically below about 50% load. Please note that efficiency values provided by different motor manufacturers are comparable only if the same measuring method has been used. Many of the overall concepts in ieee 112 methods b and f can carry over into the case of inverter power. Induction motor efficiency test methods ieee journals. Motor efficiency requirements are set by 1992 energy policy act epact, primarily for larger motors as used in industry and hvac. Electric motor drives are significant to the overall energy requirements of the country and the world. Motor efficiency mechanical power electrical power the output speed is function of the throttle, in %, and of the load torque in nm. Furthermore, since the 1st of january 2017 electric motors with a rated output of 0,75375 kw must meet either ie3 efficiency or ie2 if fitted with vsds. Using the analysis results, divide your motors into the following categories. This further reduces the set of motors to nonemergency breakdowns. Electric motor testing is usuallly the first thing to be sacrificed when cutting back on operational expenses.
Efficiency class ie1, ie2, ie3, or ie4 as per iec 6003430. A dynamometer for testing the efficiency of the power transmitting elements of an automotive vehicle between the engine and the surface of the rear driving shaft of the vehicle comprising an electric motor having a floating type field frame, means connected to the said field frame to measure the torque of the motor, means for independently. Section iv, part 34 of ansinema mg 12016 gives methods to test the efficiency of an overair ao motor. A higher percentage represents a more efficient motor. Electric motor efficiency under variable frequencies and loads pdf r06004. However, the range of good efficiency varies with individual motors and tends to.
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