GB/T 38090-2019 PDF in English
GB/T 38090-2019 (GB/T38090-2019, GBT 38090-2019, GBT38090-2019)
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Technical requirements of permanent magnets for drive motor of electric vehicle
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GB/T 38090-2019: PDF in English (GBT 38090-2019) GB/T 38090-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.030
K 14
Technical Requirements of Permanent Magnets for
Drive Motor of Electric Vehicle
ISSUED ON: OCTOBER 18, 2019
IMPLEMENTED ON: MAY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 4
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 6
4 Designation ... 6
5 Requirements ... 7
5.1 Magnetic Property ... 7
5.2 Temperature Coefficient ... 7
5.3 Resistivity ... 9
5.4 Bending Strength ... 9
5.5 Product Magnetic Moment Consistency ... 9
5.6 High Temperature Irreversible Magnetic Loss ... 9
5.7 Plating (or coating) Thickness ... 9
5.8 Corrosion Resistance ... 9
5.9 Binding Force ... 10
5.10 Dimensions ... 10
6 Test Methods ... 11
6.1 Magnetic Property ... 11
6.2 Temperature Coefficient ... 11
6.3 Resistivity ... 11
6.4 Bending Strength ... 11
6.5 Product Magnetic Moment Consistency ... 11
6.6 High Temperature Irreversible Magnetic Loss ... 11
6.7 Plating (or coating) Thickness ... 11
6.8 Corrosion Resistance ... 11
6.9 Binding Force ... 12
6.10 Dimensions ... 12
7 Inspection Rules ... 12
7.1 Inspection Classification ... 12
7.2 Inspection Items ... 12
7.3 Exit-factory Inspection Sampling and Group Rules ... 12
7.4 Inspection Result Determination and Re-inspection Rules ... 13
8 Marking, Packaging, Transportation and Storage ... 13
8.1 Marking ... 13
8.2 Packaging ... 14
8.3 Transportation and Storage ... 14
Appendix A (informative) A Comparison of Designations of CGS and SI Unit
System of Sintered Neodymium Iron Boron Permanent Magnets... 15
Appendix B (normative) Resistivity Measurement Method of Sintered
Neodymium Iron Boron Permanent Magnets ... 16
Appendix C (informative) High Temperature Irreversible Magnetic Loss
(magnetic attenuation) Measurement Method of Permanent Magnets ... 18
Bibliography ... 21
Technical Requirements of Permanent Magnets for
Drive Motor of Electric Vehicle
1 Scope
This Standard stipulates the technical requirements (magnetic property, temperature
characteristics, allowable deviations of magnetic property, allowable deviations of
dimensions and corrosion resistance) of sintered neodymium iron boron permanent
magnets for drive motor of electric vehicle, as well as their test methods, inspection
rules, marking, packaging, transportation and storage, etc.
This Standard is applicable to sintered neodymium iron boron permanent magnets for
drive motor of electric vehicle (hereinafter referred to as permanent magnets).
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 2828.1-2012 Sampling Procedures for Inspection by Attribute - Part 1: Sampling
Schemes Indexed by Acceptance Quality Limit (AQL) for Lot-by-lot Inspection
GB/T 2900.60-2002 Electrotechnical Terminology - Electromagnetism
GB/T 3217 Methods of Test of the Magnetic Properties of Permanent Magnetic
(magnetically hard) Materials
GB/T 6461-2002 Methods for Corrosion Testing of Metallic and Other Inorganic
Coatings on Metallic Substrates - Rating of Test Specimens and Manufactured Articles
Subjected to Corrosion Tests
GB/T 6462 Metallic and Oxide Coatings - Measurement of Coating Thickness -
Microscopical Method
GB/T 9637-2001 Electrotechnical Terminology - Magnetic Materials and Components
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
GB/T 24270 Method of Measurement of Temperature Coefficient of Magnetic
Properties of Permanent Magnetic Materials
GB/T 29628 Guides for Methods of Measurement of the Magnetic Properties of
5.3 Resistivity
The resistivity of permanent magnets perpendicular to the direction of easy
magnetization shall be not less than 1.22 m; the resistivity of permanent magnets
parallel to the direction of easy magnetization shall be not less than 1.38 m.
5.4 Bending Strength
The bending strength of permanent magnets perpendicular to the direction of easy
magnetization shall be not less than 220 MP; the bending strength of permanent
magnets parallel to the direction of easy magnetization shall be not less than 180 MPa.
5.5 Product Magnetic Moment Consistency
Product magnetic moment consistency (at the temperature condition of 20 °C) shall
satisfy the following requirements: the magnetic moment deviation of permanent
magnets whose mass is above 10 g shall be less than 4%; the magnetic moment
deviation of permanent magnets whose mass is between 5 g ~ 10 g shall be less than
6%; the magnetic moment deviation of permanent magnets whose mass is below 5 g
shall be less than 8%.
5.6 High Temperature Irreversible Magnetic Loss
The high temperature irreversible magnetic loss of permanent magnets shall be
determined by the demand-side and the supply-side through negotiation.
5.7 Plating (or coating) Thickness
After surface treatment, the thickness range of the central plating (or coating) of
permanent magnets is 3 m ~ 70 m; plating (or coating) thickness at the corners is
allowed to be different from the thickness of the magnetic body’s central location, but
this thickness difference shall be not more than 30 m.
5.8 Corrosion Resistance
Corrosion resistance of permanent magnets shall satisfy the requirement of salt spray
test time stipulated in Table 3. After the test, permanent magnets shall reach the
requirements of protection rating and appearance rating Level-10 as stipulated in GB/T
6461-2002.
6 Test Methods
6.1 Magnetic Property
The test of main magnetic properties of permanent magnets shall comply with the
stipulations in GB/T 3217 or GB/T 29628.
6.2 Temperature Coefficient
The test of temperature coefficient of permanent magnets shall comply with the
stipulations in GB/T 24270.
6.3 Resistivity
The measurement method of electrical resistivity of permanent magnets shall comply
with the stipulations in Appendix B.
6.4 Bending Strength
The test of bending strength of permanent magnets shall comply with the stipulations
in GB/T 31967.2.
6.5 Product Magnetic Moment Consistency
The measurement of magnetic moment of permanent magnets shall comply with the
stipulations in IEC 60404-14. Product magnetic moment consistency is the ratio of
sampling product’s magnetic moment range (the difference between the maximum
value and the minimum value) and the average value.
6.6 High Temperature Irreversible Magnetic Loss
The measurement of high temperature irreversible magnetic loss of permanent
magnets shall refer to the method described in Appendix C.
6.7 Plating (or coating) Thickness
The measurement of plating (or coating) thickness of permanent magnets shall comply
with the stipulations in GB/T 6462.
If there are multiple metal plating, then, measure the total thickness of the plating.
6.8 Corrosion Resistance
The test of corrosion resistance of permanent magnets shall comply with the
stipulations in GB/T 10125.
Thickness
6 Corrosion Resistance 3 PCS/batch 5.8 GB/T 10125
7 Dimensions
General inspection level-I in GB/T
2828.1-2012, normal inspection
single sampling scheme
5.10 6.10
7.4 Inspection Result Determination and Re-inspection Rules
When each inspection item is qualified in product inspection, then, this batch of
products shall be determined as qualified. If there are disqualified items, take double
size of samples from this batch of products to conduct re-inspection of the disqualified
items. In re-inspection, when all the re-inspection items are qualified, then, this batch
of products shall be determined as qualified. If there are still disqualified items in re-
inspection, then, this batch of products shall be determined as disqualified.
The result determination and re-inspection rules of type inspection shall be determined
by the demand-side and the supply-side through negotiation.
8 Marking, Packaging, Transportation and Storage
8.1 Marking
8.1.1 Each batch of products shall be attached with product certificate and quality
warranty; seals of inspector and quality inspection department.
8.1.2 Product certificate shall indicate:
a) Product name (or representative symbol), dimensions and batch number;
b) Quantity;
c) Date of inspection;
d) Manufacturer’s name and address;
e) Inspector’s code and inspection department’s seal;
f) Serial number of Standard being implemented.
8.1.3 If applicable, quality warranty shall include:
a) Product name (or representative symbol);
b) Serial number of Standard being implemented;
c) Specifications and dimensions;
d) Quantity;
sufficiently large, the thickness of the specimen being tested shall be not more than 10
mm. The location of 4 contact ends shall be symmetrically distributed along the
circumference. In addition, proper contact with the specimen being tested shall also be
guaranteed. The contact fillet radius shall be not more than 2 mm.
B.4 Measurement Procedures
Measurement procedures are:
a) As it is shown in Figure B.1, connect Contact End 1 and Contact End 2 with
current supply; connect Contact End 3 and Contact End 4 with nanovoltmeter.
In accordance with the thickness of specimen, set the output current of current
supply to be I12; meanwhile, read the reading on the nanovoltmeter U43;
b) Similarly, connect Contact End 2 and Contact End 3 with current supply;
connect Contact End 1 and Contact End 4 with nanovoltmeter; re-set the
output current of current supply to be I23; I23 shall be equal to I12. Meanwhile,
read the reading on the nanovoltmeter U14;
c) In accordance with Formula (B.1), calculate electrical resistivity:
Where,
---electrical resistivity, expressed in ( m);
d---specimen thickness, expressed in (mm);
U43---voltage between Contact End 4 and Contact End 3, expressed in (mV);
U14---voltage between Contact End 1 and Contact End 4, expressed in (mV);
I12---current between Contact End 1 and Contact End 2, expressed in (A);
I23---current between Contact End 2 and Contact End 3, expressed in (A).
2 °C.
C.2.5 After the thermal insulation is completed, take the specimens, along with the iron
plate, out of the high-temperature chamber. Then, naturally cool them down to room
temperature.
C.2.6 Measure magnetic flux t after the test. In accordance with Formula (C.1),
calculate the magnetic attenuation.
C.2.7 In accordance with the above-mentioned method, it is measured that:
designation D42UH, specification 22.5 13.7 5, after 150 °C 2 h, average magnetic
attenuation rate is 0.68%, maximum magnetic attenuation rate is 0.85%; after 180 °C
2 h, average magnetic attenuation rate is 2.57%, maximum magnetic attenuation
rate is 4.20%. This value may be taken as a reference for agreement-signing between
the demand-side and the supply-side.
C.3 Measurement Method 2
C.3.1 The ambient temperature of measurement is 20 °C. Before measurement, in
order to make specimen temperature consistent with the ambient temperature,
specimens shall be placed in room temperature environment for not less than 30 min.
C.3.2 Magnetize specimens, till they become saturated.
C.3.3 Adopt flux meter, match with Helmholtz coil, in accordance with IEC 60404-14,
measure magnetic flux 0.
C.3.4 Place specimens on an iron plate, which has the thickness of 3 mm ± 0.1 mm
and the texture of Q235. The N-pole and S-pole of each magnetic steel shall be
interlaced; the interval is the longest side distance of magnetic steel. In addition, the
direction of the magnetic pole shall be vertical to the iron plate plane. Place the
specimens, along with the iron plate, into high-temperature chamber. Wait till the high-
temperature chamber reaches the set measurement temperature 180 °C, conduct
thermal insulation for 2 h. Temperature fluctuation of the high-temperature chamber
shall be controlled within ± 2 °C.
C.3.5 After the thermal insulation is completed, take the specimens, along with the iron
plate, out of the high-temperature chamber. Then, naturally cool them down to room
temperature.
C.3.6 Measure magnetic flux t after the test. In accordance with Formula (C.1),
calculate the magnetic attenuation.
C.3.7 Repeat C.3.4 ~ C.3.6 for 4 times in total.
C.3.8 In accordance with the above-mentioned methods, it is measured that after 5
high-temperature cycles, the average irreversible magnetic loss (magnetic attenuation)
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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