All motors (including high-voltage motors) to go through the type testing and performance testing at the factory prior to fully meet the technical requirements in order to put into operation or continue production. The data of these tests or trials include motor voltage, current, speed, power, slip frequency, efficiency, temperature, resistance, etc. These parameters are to meet the accuracy of the relevant national standards GB1032-phase asynchronous motor test methods safety requirements based on the load test, load test, temperature test, torque test and other tests described in this article intelligent high-voltage motor test system with automated test, measurement data can reflect motor performance, and quality.

    About 1.1 motor type test

    Motor test equipment, instrumentation and related equipment, in accordance with the relevant provisions of the standard, semi-finished and finished products in the manufacturing process of the motor or motor as the main products supporting the electrical properties, mechanical properties, security, performance and reliability technical indicators inspection. These tests, in whole or in part reflects the test motor performance data, use this data, you can determine whether the product is in line with the goals and direction of the pros and cons of the design requirements, quality and improved.

    The so-called type test is a comprehensive performance test test test motor performance parameters can be more exactly, its purpose is to determine whether the electrical and mechanical parameters of the motor fully meet the technical requirements, various types of motors are required by This test can be put into operation or continue production. International standards and Britain, the Soviet Union, Germany and other countries regarded as a performance test, type test is used to check the characteristics and parameters of the motor. Such trials generally various types of motors in the first or the first few prototype, so called type test.

    If necessary, the test may include all items defined in the standard, can also be part of the project.

    According to national standards should be type tested in the following cases:

    A new design prototype products;

    Identified formed a small group of trial operation;

    3 changes enough to cause some of the characteristics and parameters of the motor change product design or willful;

    Check the test structure with the previous test structure impermissible deviation;

    5 products from the stereotypes put into regular pumping again.

    1.1.1 No-load test and load test

    Motor test items, such as no-load test, load test, stall test, temperature rise test, only describes the system design and design load and load tests. It is necessary to clarify the test objectives and test procedures.

    No-load characteristic test

    (1) Test Purpose:

    Three-phase asynchronous motor no-load test is applied to the stator rated voltage, rated frequency test purposes:

    check the operation of the motor flexible, with or without abnormal noise and strong vibration;

    b. obtained by testing the core loss of the motor at rated voltage and mechanical losses at rated speed;

    through the experiment showed that the no-load current and no-load voltage of the curve. This curve is actually a magnetization curve. It reflects the work of the motor magnetic circuit, for example, the performance of the core material, the rotor air gap reasonable choice.

    (2) Test procedure:

    The motor start and maintain no-load operation of the rated voltage and frequency stability to mechanical wear and tear. To determine the stability of the mechanical loss of the standard are: input power separated by half an hour the difference between the two readings of not more than 3% of the input power, in practical applications, the general rule of thumb to determine, on the motor 1KW following generally run 15 to 30min, 1 ~ 10KW motors generally run 30 to 60min greater than 10KW motor for 60 to 90min.

Test, the voltage applied to the stator windings from 1.1 ~ 1.3Un start, gradually reduced to the lowest possible voltage value, so that the current starts to rise until the measured therebetween take 7 to 9 points, each point is to take the following values should be measured : three-phase voltage (such as to determine the three-phase equilibrium can be measured only one phase), three-phase current, input power P0.

    2 Load Test

    (1) Test Purpose:

    In fact made for the purpose of load test to measure take the motor operating characteristic curve, considering the efficiency and power factor is qualified to obtain the necessary data for analysis of the performance of the motor running.

    (2) Test procedure:

    The test should be close to the thermal state of the motor is tested, rated power and rated frequency, change the load readings taken in the closed beta of 1.25 to 0.25 times the rated power range 6 to 8:00 every point measurements: three-phase voltage, three phase current, input power, power factor, slip, output torque. The actual slip is calculated by measuring the rotational speed of the rotor.

    1.1.2 motor testing standards

    The test to achieve the system design must first meet the relevant national standards GB1032-phase asynchronous motor test method accuracy and safety requirements:

    Test power

    1) all harmonics other than the addition to the fundamental component contained in the test power supply voltage sine wave voltage waveform distortion rate (RMS square root values of the fundamental component of the RMS ratio of the percentage) should not exceed 5 % during the temperature rise test should be no more than 2.5%.

    2) symmetry of the three-phase voltage test power system shall comply with the following requirements:

Negative sequence component of the voltage and zero-sequence component does not exceed 1% of the positive sequence component; during the temperature rise test, negative sequence component does not exceed 0.5% of the positive sequence component, the impact of the zero-sequence component to be eliminated.

    Test power frequency rated frequency difference between the rated frequency ± 1% range.

    2 measuring instruments

    Test, the accuracy of the use of electrical measuring instruments shall not be less than 0.5, the three-phase watt meter accuracy should be not less than 1.0, the accuracy of the transformer should be not less than 0.2, the accuracy of the power transmitter degree should not be less than 0.5% (check the test should be not less than 1%), digital speed measuring instrument and slip the accuracy of the measuring instrument shall be not less than 0.1% ± 1 word, torque measuring instrument the accuracy of the dynamometer shall not be less than 1% (measured efficiency should be not less than 0.5%).

The choice of instrument, the measured value is within the range of 20% -95% range of the instrument.

    (3) measurement requirements

    Electrical measurements, you should follow the following requirements:

    1) three-phase current with three current transformer (or transformer) method.

    2) current transformer, access to pay-edge instruments in the loop impedance (including connecting wires) shall not exceed the rated impedance value.

    3) test, the meter readings at the same time read. Three-phase voltage or three-phase current measurements, the average value of the three-phase readings should be taken as a measurement of the actual value.

    1.2 motor automatic test characteristics and motor testing the status quo

    The motor test is often used the ordinary pointer instrument by manual reading, manual record, and then finishing by hand into the data and drawing curves or the preparation of the experimental report. Due to some reason, such as power fluctuations, frequency fluctuations, load fluctuations and other factors cause the meter needle swing, in order to more accurate readout of the measured parameters of a moment, and often requires several people at the same time meter reading, work efficiency low. Not only that, the meter reading is not the same as well as reading, recording a variety of human error in the calculation but also the experimental data dispersion test after the low accuracy, poor reproducibility, this test method is now basically been eliminated.

    One alternative is to use a variety of electronic measuring instruments, such as multi-functional electrical test parameters can be measured in various states, the motor torque, speed, output power, such instruments are generally constituted by the microcontroller, high accuracy, digital display, relatively complete functions, improve the degree of automation, data processing during the test readings synchronization is still not ideal.

    Developed on the basis of the digital instrument digital automatic test system can control the measurement process, processing test data, records and displays the measurement results. The motor automatic test system for the use of computer test function, measurement accuracy and other indicators are far more than traditional experimental methods. The motor test into a new era.

    In recent years, due to the computer's functions from strength to strength, a variety of man-machine interface software are emerging to the motor test, which provides a visual monitor screen. Which in turn makes the motor test is a major step forward.