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GB/T 22669-2008 English PDF (GBT22669-2008)

GB/T 22669-2008 English PDF (GBT22669-2008)

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GB/T 22669-2008: Test procedures for three-phase permanent magnet synchronous machines
GB/T 22669-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.160.30
K 21
Test procedures for three-phase permanent magnet
synchronous machines
ISSUED ON: DECEMBER 31, 2008
IMPLEMENTED ON: NOVEMBER 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Main symbols ... 5 
4 Test requirements ... 7 
5 Test preparation ... 11 
6 No-load test ... 14 
7 Stall test ... 16 
8 Load test ... 19 
9 Determination of various losses ... 20 
10 Determination of efficiency ... 25 
11 Thermal test ... 27 
12 Measurement of out-of-step torque ... 34 
13 Determination of pull-in torque ... 35 
14 Determination of minimum torque ... 40 
15 Other tests ... 43 
16 Calculation method ... 47 
Annex A (normative) Correction of dynamometer torque reading ... 53 
Annex B (informative) Linear regression analysis ... 55 
Annex C (informative) Measurement and separation calculation method of iron
consumption and wind abrasion ... 57 
Test procedures for three-phase permanent magnet
synchronous machines
1 Scope
This Standard specifies the test procedures for three-phase permanent magnet
synchronous machines.
This Standard is applicable to self-starting three-phase permanent magnet
synchronous machines. The test for synchronous machines powered by static
variable frequency power supply may refer to use. It is not applicable to
synchronous machines with DC excitation winding.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For dated references, the subsequent
amendments (excluding corrigendum) or revisions do not apply to this Standard,
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB 755-2008, Rotating Electrical Machines - Rating and Performance (IEC
60034-1:2004, IDT)
GB/T 1029-2005, Test procedures for three-phase synchronous machines
GB/T 1032-2005, Test procedures for three-phase induction motors
GB 10068-2008, Mechanical vibration of certain machines with shaft heights
56 mm and higher-measurement evaluation and limits of vibration severity
(IEC 60034-14:2003, IDT)
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 (ISO
1680:1999, MOD)
GB/T 13958-2008, Test procedures for non-direct current excitation winding
synchronous motor
PS0 - No-load stray loss (W);
P0 - No-load input power (W);
PK - Input power during stall (W);
Pcu1 - I2R loss of stator winding at test temperature (W);
P0cu1 - I2R loss of stator winding under test temperature at no load (W);
Pcu1S - I2R loss of stator winding at specified temperature (θs), (W);
R1 - Initial resistance of the stator winding at a temperature of θ1 (Ω);
RN - End resistance of stator winding at the end of rated load thermal test (Ω);
Rt - Measured (or obtained) resistance of the stator winding end at the test
temperature (Ω);
RS - Stator winding end resistance (Ω) converted to a specified temperature (θs);
R0 - Stator winding end resistance of no-load test (each voltage point) (Ω);
Td - Torque reading (N·m);
Td0 - No-load (connected to the dynamometer) torque reading (N·m);
T - Corrected torque (N·m);
TK - Torque at stall (N·m);
Tp0 - Out-of-step torque measured under the test voltage UT (N·M);
Tp0N - Out-of-step torque at rated voltage (N·m);
Tmin - Minimum torque (N·m);
Tpi - Pull-in torque measured at test voltage Ut (N·m);
TpiN - Nominal pull-in torque at rated voltage (N·m);
Ta - Asynchronous torque (N·m);
TN - Permanent magnet braking torque (N·m);
U - Terminal voltage (V);
U0 - No-load test terminal voltage (V);
UK - Stalling test terminal voltage (V);
4.1.2.2 Frequency stability
No rapid changes in frequency are allowed during the test because the rapid
frequency change affects not only the motor under test, but also the output
measurement device. The frequency change during the measurement shall be
less than 0.1%.
4.2 Measuring instrument
4.2.1 Overview
The accuracy level of most instruments is usually expressed as a percentage
of full scale. Therefore, try to select low-range meters according to the actual
reading needs.
Factors that affect the accuracy of instrument measurement results:
a) Signal source load;
b) Lead wire correction;
c) Instrument range, operating conditions and calibration.
4.2.2 Electricity measuring instrument
In general, the accuracy of electricity measuring instruments shall not be less
than 0.5 (full scale, except megohmmeter). When using method B to measure
the motor efficiency, in order to maintain the accuracy and repeatability of the
test results, it is required that the accuracy level of the instrument is not less
than 0.2 (full scale).
Generally speaking, electronic instruments are versatile. Compared with
passive instruments (non-electronic type), it has a very large input impedance,
so there is no need to correct the reading due to the instrument's own losses.
But high input impedance instruments are more sensitive to interference.
Measures to reduce interference shall be taken based on practical experience.
The accuracy level of the instrument transformer used for measurement shall
not be lower than level 0.2 (full scale).
4.2.3 Torque measuring instrument
The accuracy level of torque tester (including dynamometer and sensor) for
general test should not be lower than level 0.5.
When method B (see 10.2.2) is used to determine efficiency, the accuracy level
of the torque measuring instrument shall not be lower than level 0.2 (full scale).
the insulation resistance of each phase winding to the chassis and to each other
shall be measured separately. If the three-phase winding has been connected
inside the motor and only leads to three outlets, then measure the insulation
resistance of all windings to the chassis.
After the measurement, the winding shall be discharged to ground.
5.2 Measurement of DC resistance of the winding in the initial (cold) state
5.2.1 Measurement of winding temperature in the initial state
Use a thermometer to measure the winding temperature. The motor shall be
placed indoors for a period of time before the test. The difference between the
winding temperature measured by a thermometer (or embedded thermometer)
and the cooling medium temperature shall not exceed 2K. For large and
medium-sized motors, the placement time of the thermometer shall not be less
than 15min.
5.2.2 Measurement methods
5.2.2.1 The DC resistance of the winding is measured with a double-arm bridge
or a single-arm bridge. When the resistance is 1Ω or less, it must be measured
with a double-arm bridge or an instrument of equivalent accuracy and capable
of eliminating the influence of the measuring wire and contact resistance.
5.2.2.2 When using an automatic detection device or a digital micro-ohmmeter
to measure the resistance of the winding end, the test current through the tested
winding sh...
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