GB/T 5171.21-2016 PDF EnglishUS$610.00 · In stock · Download in 9 seconds
GB/T 5171.21-2016: Small power motors - Part 21: General test methods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 5171.21-2016: Small power motors - Part 21: General test methods---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5171.21-2016GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 29.160.30 K 20 Small power motors - Part 21.General test methods Issued on. AUGUST 29, 2016 Implemented on. MARCH 01, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China. Table of ContentsForeword... 4 1 Scope... 5 2 Normative references... 5 3 Terms and definitions, symbols... 6 4 Basic requirements for test... 11 5 Test preparation... 20 6 Temperature rise test... 21 7 Determination of efficiency... 28 8 Locked-rotor test... 41 9 Other test items... 42 Annex A (normative) Correction methods for instrument loss... 60 Annex B (normative) Determination of correction value Tc of dynamometer torque reading... 62 Annex C (normative) Specification for selection, preparation, arrangement, installation and connection of thermocouples... 63 Annex D (informative) Test report template for loss analysis method (method B) ... 66 Bibliography... 681 ScopeThis Part of GB/T 5171 specifies terms and definitions, symbols involved in general test methods for small power motors, basic requirements for the test, test preparation, temperature rise test, efficiency determination, as well as locked-rotor test and other test methods. This Part is applicable to the products defined in GB/T 5171.1. The special test items and methods of various types of small power motors that are not specified in this Part need to be supplemented in the test method standards for this type of small power motors.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 755, Rotating electrical machines - Rating and performance GB/T 1958, Geometrical Product Specifications (GPS) - Geometrical tolerance - Verification GB/T 2423 (all parts), Environmental testing - Part 2.Test methods GB/T 2828.1, Sampling procedures for inspection by attributes - Part 1. Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection GB/T 4942.1, Degrees of Protection Provided by the Integral Design of Rotating Electrical Machined (IP Code) - Classification GB/T 5171.1, Small Power Motors - Part 1.General Technical Requirements GB/T 10069.1, Measurement of airborne noise emitted by rotating electrical machines and the noise limits - Part 1.Method for the measurement of airborne noise emitted by rotating electrical machines GB/T 12113-2003, Methods of measurement of touch current and protective conductor current3 Terms and definitions, symbols3.1 Terms and definitions For the purposes of this document, the terms and definitions defined in GB/T 5171.1 and GB 12350 as well as the followings apply. 3.1.1 efficiency the ratio of output power to input power in the same unit, usually expressed as a percentage 3.1.2 dynamometer a device for measuring the torque applied to the rotating parts of the machine under test; the device can measure and display torque and speed, and is not limited to the bearing housing structure; the coaxial torque sensor can be used to directly measure the torque of the measured motor drive shaft 3.1.3 thermal equilibrium a state that the temperature rise of the heating parts of the motor does not exceed 1K within half an hour 3.1.4 temperature-rise test a test to determine the temperature rise of one or several parts of the motor, under specified operating conditions 3.1.9 operating time limit test a test to determine the normal operation period that the manufacturer guarantees to the user under the specified conditions 3.2 Symbols The following symbols apply to this document. cosφ - Power factor;4 Basic requirements for test4.1 Test ambient conditions Ambient temperature. 15°C~30°C Relative humidity. 45%~75% Atmospheric pressure. 86kPa~106kPa The ambient temperature during temperature rise and efficiency test. 20°C ± 5°C. For motors equipped with thermostats or thermal fuse, if in doubt, the ambient temperature during the temperature rise test is maintained at 23°C ± 2°C. 4.2 Test power 4.2.1 AC power The harmonic voltage factor (HVF) of the AC power supply used for the test shall not exceed 0.02.When conducting temperature rise and efficiency tests, the harmonic voltage factor (HVF) shall not exceed 0.015. 4.2.2 Three-phase AC power supply For three-phase AC power supply, in addition to meeting the requirements in 4.2.1, the negative sequence component of the three-phase voltage system shall be less than 0.5% of the positive sequence component, and the influence of zero sequence component shall be eliminated. The negative sequence component of the measuring current system can be used to replace the negative sequence component of the measuring voltage system. 4.2.3 DC power supply The DC power supply equipment used in the test shall not exceed 0.5% of the nominal source voltage and the output voltage tolerance of each output under half-rated load. For each output, within the specified load range and under the most unfavorable supply voltage, the load regulation rate is not more than 0.2%. 4.3 Use of measuring instruments 4.3.1 General The ambient conditions during the test shall be within the range recommended by the equipment manufacturer. If applicable, temperature corrections shall be made to the measured values according to the manufacturer's equipment instructions. 4.3.2 Measurement of electric quantity Unless otherwise specified, the accuracy of the electrical measuring instrument used shall not be less than level 0.5. 4.3.3 Torque measurement The accuracy of the instrument used to measure torque shall not be less than level 0.5.When measuring efficiency, it shall not be less than level 0.2.The measured minimum torque shall be at least 10% of the rated torque of the torque measuring instrument. If a better grade measuring instrument is used, the allowable torque range is expanded accordingly. 4.3.4 Measurement of rotating speed 4.3.5 Frequency measurement The accuracy level of the frequency meter shall not be less than level 0.1. 4.3.6 Temperature measurement 4.3.7 Determination of winding resistance 4.3.8 Other measuring instruments In order to ensure the accuracy of the test results, other measuring instruments used in the test process shall also have sufficient accuracy, for example.5 Test preparation5.1 Determination of insulation resistance 5.1.1 State of motor during measurement When measuring the insulation resistance of motor windings, it shall be respectively carried out under the actual cold state and thermally stable state (after the temperature rise test). During the exit-factory test, if there are no other provisions, the measurement is allowed in the actual cold state. When measuring the insulation resistance, the winding temperature shall be measured and recorded at the same time. When measuring in the actual cold state, the surrounding medium temperature can be used as the winding temperature. 5.1.2 Selection of megohmmeter According to the rated voltage of the motor, select the megohmmeter according to Table 1. 5.1.3 Measurement methods When measuring the winding insulation resistance, if the beginning and end of each winding circuit have been led out of the casing, then the insulation group of each winding circuit to the casing and the windings shall be measured separately. If the winding has been connected inside the motor, when only the wire end is drawn out, measure the insulation resistance of the wire end to the casing. 5.2 Determination of cold-state winding temperature θ1 and cold-state winding resistance R1 Put the motor indoors for a period of time.6 Temperature rise test6.1 Overview The purpose of the temperature rise test is to determine the temperature rise of windings and certain parts of the motor that are higher than the temperature of the cooling medium when the motor is running under specified load conditions. The temperature measurement method is selected according to 4.3 and the relevant provisions of this Clause. 6.2 General description Measures shall be taken during the test to minimize the change in the temperature of the cooling medium. 6.3 Determination of cooling medium temperature at the end of temperature rise test 6.4 Temperature measurement methods for motor winding and other parts 6.4.1 Determination of winding temperature The temperature of motor windings is measured by resistance method, including live temperature measurement method. 6.4.2 Determination of iron core temperature The iron core temperature is measured with a thermometer or thermocouple. 6.5 Temperature rise test method 6.5.1 Determination of load 6.5.2 Duration of various motor temperature rise tests 6.5.4 Determination of winding resistance R2 measured by live temperature measurement method When using the live temperature measurement method, the measured additional current shall not exceed 1% of the rated current of the tested motor. The stable response time of the thermometer does not exceed 40s. 6.6 Calculation of winding working temperature θ2 The working temperature of the winding refers to the temperature of the winding when the motor reaches a thermally stable state during the rated load temperature rise test, calculated according to formula (9). 6.7 Calculation of winding temperature rise Δθ Winding temperature rise is calculated according to formula (11).7 Determination of efficiency7.1 Overview For motors with sealing rings, if there is no special agreement, the efficiency measurement shall be carried out after the sealing rings are removed. 7.2 Direct method (method A) 7.2.1 Overview This is a test method in which the mechanical output power of a motor is determined by measuring the torque and speed of the shaft. The electrical input power of the stator is measured in the same test. 7.2.2 Determination of output power 7.2.2.1 Dynamometer method and torque measuring instrument method Connect the tested motor and the dynamometer or load motor with a torque measuring instrument. 7.2.3 Calculation of efficiency The efficiency η of the motor at different loads is calculated according to formula (17). For dynamometer method and torque measuring instrument method, draw efficiency curve η=f(P2). 7.3 Loss analysis method (method B) 7.3.1 Overview This is a test method to determine efficiency by summing up various losses. 7.3.2 Test procedures 7.3.2.1 Rated load test Winding temperature and resistance at ambient temperature 7.3.2.1 Rated load test Winding resistance during rated load test 7.3.2.2 Load loss Stator and rotor winding losses 7.3.2.3 Load curve test Torque measurement and winding resistance measurement 7.3.2.4 No-load test Winding resistance during no-load test 7.3.2.5 Constant loss Wind resistance and friction loss, iron loss 7.3.2.6 Additional load loss From stray loss8 Locked-rotor testThe locked-rotor test is carried out when the motor is close to the actual cold state. During the test, the rotor shall be blocked. Apply a rated voltage on the motor.9 Other test items9.1 Dimension inspection 9.1.1 Shape and installation dimension inspection Vernier caliper or micrometer can be used to check the appearance and installation dimensions of the motor. 9.1.2 Axial movement The motor axis is placed horizontally and fixed on the plate. The measuring head of the dial indicator is placed on the top of the shaft extension. Apply the force specified in Table 3 to the shaft along the axis. First in one direction, then in the opposite direction. 9.1.3 Shape error and position error inspection 9.1.3.1 General The testing principle, testing conditions, evaluation method and testing plan of the shape error and position error of the motor (hereinafter referred to as the shape and position error) shall meet the requirements of GB/T 1958. 9.1.3.2 Radial runout of shaft extension The motor axis is placed horizontally and fixed on the plate. The measuring head of the dial indicator is placed at half of the shaft extension. Rotate the shaft slowly and steadily for one revolution. 9.1.3.5 Flatness of foot support surface Place the motor on the plate. Use feeler gauge to measure the gap between the motor foot and the plate. Measure the straightness error values of several sections at different points. The maximum value is the flatness of the foot support surface. 9.1.3.6 Parallelism of motor axis to foot supporting surface The motor axis is placed horizontally and fixed on the plate. The axis is simulated by the upper element line of the shaft extension. The values measured at two positions on the shaft extension with a measuring distance of L2 are M1 and M2, respectively. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 5171.21-2016 be delivered?Answer: The full copy PDF of English version of GB/T 5171.21-2016 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 5171.21-2016_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 5171.21-2016_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 5171.21-2016 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.How to buy and download a true PDF of English version of GB/T 5171.21-2016?A step-by-step guide to download PDF of GB/T 5171.21-2016_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 5171.21-2016". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
