GB/T 1032-2023 Iron ores—Determination of specific surface area—Test method using air-permeability apparatus (Blaine)
Test methods for three-phase asynchronous motors
1 Scope
This document describes the test requirements and test methods for three-phase asynchronous motors. The test methods include determination of insulation resistance, determination of DC resistance, thermal test, load test, no-load test, locked-rotor test, determination of losses and efficiency, torque-speed characteristic test, rotational inertia test, short-time over-torque test, impulse voltage withstand test on interturn insulation, power frequency voltage withstand test, determination of rotor open-circuit voltage, overspeed test, determination of vibration and noise, and determination of shaft voltage and bearing current.
This document is applicable to three-phase asynchronous motors.
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions 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/T 755-2019 Rotating electrical machines - Rating and performance
GB/T 10068-2020 Mechanical vibration of certain machines with shaft heights 56 mm and higher - Measurement, evaluation and limits of vibration severity
GB/T 10069.1-2006 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 21211-2017 Equivalent loading and superposition techniques - Indirect testing to determine temperature rise of rotating electrical machines
GB/T 22715-2016 Impulse voltage withstand levels of form-wound stator coils for rotating a.c. machines
GB/T 22719.1-2008 Interturn insulation of random-wound winding for AC low-voltage electrical machines - Part 1: Test methods
GB/T 25442-2018 Standard methods for determining losses and efficiency of rotating electrical machines from tests (excluding machines for traction vehicles)
GB/T 34861-2017 Specific methods for determining separate losses of large machines from tests
JB/T 7836.1-2005 Electric heater for electrical machine - Part 1: General technique specifications
JB/T 10500.1-2019 Embedded thermometer resistance for electrical machines - Part 1: General specification, measuring methods and examine rule
T/CMIF 129-2021 /
T/CEEIA 492-2021 Technical specifications for static variable frequency power supply for motor testing
3 Terms and definitions
For the purposes of this standard, the following terms and definitions and those given in GB/T 755-2019 and GB/T 25442-2018 apply.
3.1
asynchronous machine
an AC machine whose ratio of speed under load to the frequency of the connected power grid is not constant
[Source: GB/T 2900.25-2008, 411-31-09]
3.2
motor
machine that converts electrical energy into mechanical energy
[Source: GB/T 2900.25-2008, 411-33-01]
3.3
type test
test conducted on one or several machines manufactured according to a specific design to demonstrate that the design complies with specified standards
[Source: GB/T 2900.25-2008, 411-53-01]
3.4
routine test
test performed on each machine after completion of manufacturing to determine whether it complies with the standards
[Source: GB/T 2900.25-2008, 411-53-02]
3.5
insulation resistance test
test to determine the insulation resistance under specified conditions
[Source: GB/T 2900.25-2008, 411-53-48]
3.6
thermal test
test to determine the temperature rise of one or more components of the machine under specified operating conditions
3.7
load test
test to determine the load characteristics of the machine under specified operating conditions
3.8
no-load test
test in which the motor operates without effective mechanical output on its shaft
3.9
locked-rotor test
test conducted with the rotor locked and the machine energized to determine the locked-rotor torque and current
[Source: GB/T 2900.25-2008, 411-53-32]
3.10
efficiency
ratio of output power to input power, usually expressed as a percentage (%)
[Source: GB/T 2900.25-2008, 411-53-08]
3.11
impulse test
test in which a non-periodic transient voltage is applied to the insulation, with the polarity, amplitude, and waveform of the test voltage conforming to predefined specifications
[Source: GB/T 2900.25-2008, 411-53-55]
3.12
interturn test
test conducted to verify the integrity of interturn insulation by applying a voltage of specified amplitude between adjacent turns of insulated conductors
[Source: GB/T 2900.25-2008, 411-53-56]
3.13
power frequency voltage withstand test
test in which power frequency high voltage is applied to the insulation to determine whether its dielectric strength meets the requirements
[Source: GB/T 2900.25-2008, 411-53-49, modified]
3.14
overspeed test
test conducted on the machine to determine whether the rotor can meet specified overspeed requirements
[Source: GB/T 2900.25-2008, 411-53-39]
3.15
noise-level test
test conducted to determine the noise level of the machine under specified operating conditions using prescribed measurement methods
[Source: GB/T 2900.25-2008, 411-53-42]
3.16
vibration test
test conducted to measure the vibration of machine components under specified conditions
[Source: GB/T 2900.25-2008, 411-53-41]
3.17
shaft-voltage test
test conducted with the machine energized to measure the voltage that may generate shaft currents
[Source: GB/T 2900.25-2008, 411-53-43]
4 Symbols
For the purposes of this document, the following symbols apply.
cosφ: Power factor.
f: Power supply frequency, Hz.
I1: Stator line current, A.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Basic requirements
6 Test preparation
7 Thermal test
8 Load test
9 No-load test
10 Locked-rotor test
11 Determination of losses
12 Determination of efficiency
13 Other test items
Annex A (Normative) Correction methods for instrument losses and errors
Annex B (Informative) Comparison of test methods for determining losses and efficiency
Annex C (Informative) Linear regression analysis
Bibliography
