GB/T 7345-2008 PDF English
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General requirements for electrical machine for automatic control system
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| GB/T 7345-1994 | English | RFQ |
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General requirements for electrical micro machine for automatic control system
| Obsolete |
| GB 7345-1987 | English | RFQ |
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General requirements for electrical micro machine for automatic control system
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GB/T 7345-2008: General requirements for electrical machine for automatic control system---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/GBT7345-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.160.30
K 24
Replacing GB/T 7345-1994
General requirements for electrical machine for automatic
control system
Issued on. JUNE 30, 2008
Implemented on. APRIL 01, 2009
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
National Standardization Administration.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 5
3 Terms and definitions... 6
4 Categories... 8
5 Technical requirements and test methods... 9
6 Inspection rules... 34
7 Preparation for delivery... 39
8 User services... 40
Appendix A (Normative) Standard test brackets and tooling... 41
Appendix B (Informative) Methods of measuring impedance and brush contact
resistance... 49
Appendix C (Informative) Measurement method of rotary inertia... 55
Appendix D (Informative) Measuring method of electromechanical time constant... 62
1 Scope
This standard specifies the terms and definitions, classification, basic technical
requirements and test methods, inspection rules, delivery preparation, user service
requirements for control motors and their combinations (hereinafter referred to as
motors).
This standard provides basic technical requirements and test methods for motors for
organizations which have the following needs.
a) It is necessary to prove that the motor product has the ability to meet the
requirements of users and applicable laws and regulations;
b) Ordering or product acceptance;
c) Inspection basis;
d) Government or industry regulation of product quality.
When the optional provisions in this standard are not applicable due to the
characteristics of the motor product, they can be deleted. However, the deletion cannot
affect the ability or responsibility to prove that the motor product meets the
requirements of users and applicable laws and regulations.
The test methods specified in this standard are commonly used; users of the standard
are allowed to choose and use them.
This standard specifies the basic requirements for motors. When there are special
requirements, especially for electronic drives, the manufacturer shall formulate special
technical conditions.
This standard shall be used together with the general technical conditions or special
technical conditions for motors.
This standard is applicable to various control motors and their combinations; general-
purpose motors can also be adopted by reference.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) 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 Rotating electrical machines - Rating and performance (idt IEC 60034-
1.1996)
GB/T 2423.1 Environmental testing for electric and electronic products - Part 2.Test
methods - Tests A. Cold (idt IEC 60068-2-1.1990)
GB/T 2423.2 Environmental testing for electric and electronic products - Part 2.Test
methods - Tests B. Dry heat (idt IEC 60068-2-2.1974)
GB/T 2423.3 Environmental testing - Part 2.Testing method - Test Cab. Damp heat,
steady state (eqv IEC 68-2-3.1984)
GB/T 2423.4 Environmental testing for electric and electronic products - Part 2.Test
method - Test Db. Damp heat, cyclic (12 h + 12 h cycle) (eqv IEC 68-2-30.1980)
GB/T 2423.5 Environmental testing - Part 2.Test methods - Test Ea and guidance.
Shock (idt IEC 68-2-27.1987)
GB/T 2423.10 Environmental testing - Part 2.Test methods - Test Fc. Vibration
(sinusoidal) (idt IEC 68-2-6.1982)
3 Terms and definitions
The terms and definitions as established in GB/T 2900.26, as well as the following
terms and definitions, apply to this standard.
3.1
Electrical machine for automatic control system
Various motors, motor components, systems used for status monitoring, signal
processing or servo drive in automatic control systems.
Examples. Synchro, rotary transformer, induction phase shifter, induction synchronizer,
shaft angle encoder, tachogenerator, servo motor, stepper motor, torque motor, hysteresis
synchronous motor, ultrasonic motor, permanent magnet brushless motor system, etc.
3.2
Organization
A group of people or individuals whose responsibilities, authorities, relationships
are arranged.
Examples. Manufacturers, agents, users, testing agencies, government organizations, etc.
3.3
Manufacturer
Individuals or organizations that design, produce or assemble and sell motors.
3.4
Transporter
An organization or individual that ships a manufacturer's motors to users.
3.5
Frame size
The code used when motors are classified according to their overall dimensions or
shaft center height.
3.6
Reliability
The ability of a motor to complete specified functions within a specified period of
time and under specified operating conditions.
4 Categories
4.1 Model designation
The motor model designation method shall comply with the requirements of GB/T
10405.
4.2 Basic appearance structure and installation type
The basic appearance structure and installation type of the motor shall comply with the
requirements of GB/T 7346.
4.3 Frame size
The frame size of the motor shall meet the following requirements.
4.4 Rated voltage and rated frequency
Unless otherwise specified, the rated voltage and rated frequency of the motor shall be
selected from Table 1.
5 Technical requirements and test methods
5.1 Appearance
5.1.1 Technical requirements
The surface of the motor shall be free of rust, bumps, scratches, coating peeling; the
color shall be correct; the markings shall be clear and unmistakable.
5.2 Nameplate
5.2.1 Technical requirements
The motor shall have a nameplate, which shall comply with the nameplate-related
requirements in GB/T 7346 and the durability requirements in GB 18211-2000.
5.3 Lead wires or terminals
5.3.1 Technical requirements
5.3.2 Test methods
5.3.2.1 Lead wire
Put the lead-out end of the motor's lead wire downward. Apply the force specified in
5.3.1.2 vertically downward on the terminal. When applying force, the conductor core
and insulation layer shall be evenly stressed. The force shall be applied in all directions
for 5 s ~ 10 s.
5.4 Appearance and installation dimensions
5.4.1 Technical requirements
The manufacturer shall stipulate the appearance and installation dimensions of the
motor. The appearance and installation dimensions shall comply with the general
technical conditions or special technical conditions of the motor. Unless otherwise
specified, the manufacturer shall deliver the appearance and installation dimensions
drawings when delivering the motor.
5.5 Radial clearance
5.6 Axial clearance
5.6.1 Technical requirements
The axial clearance of the motor is related to the axial dimensional matching accuracy
of the motor, the elasticity of the axial washer, and the axial force. When required, the
manufacturer shall specify the axial clearance and axial force of the motor shaft. The
axial clearance shall comply with the general technical conditions or special technical
conditions of the motor.
5.7 Shaft extension radial circular runout
5.7.1 Technical requirements
The radial circular runout of the shaft extension of the motor is related to the radial
matching size of the motor and the machining accuracy of the outer circle of the
installation stop. When required, the manufacturer shall specify the radial circular
runout of the shaft extension. The radial circular runout of the shaft extension shall
comply with the general technical conditions or special technical conditions of the
motor.
5.15 Impedance
5.15.1 Technical requirements
Impedance is a unique technical parameter of an AC motor. It reflects the matching
ability of the motor and its connected electrical equipment. When required, the
manufacturer shall specify the motor impedance.
6 Inspection rules
6.1 Inspection classification
6.2 Appraisal inspection
6.2.1 Timing and conditions of appraisal inspection
When required, appraisal inspections shall be conducted in nationally recognized
laboratories, in accordance with general technical conditions.
Group C inspection shall be carried out when one of the following circumstances occurs.
d) When the product manufacturing location changes.
6.2.2 Number of prototypes
Six prototypes are randomly selected from the batch of products, four of which are used
for appraisal inspection, whilst the other two are kept for later use.
6.2.3 Inspection procedures
The appraisal inspection items, basic sequence, prototype number are determined by
the general technical conditions of various types of motors, with reference to Table 13.
6.2.4 Evaluation of inspection results
6.2.4.1 Qualified
If all items of the prototype used for appraisal inspection meet the requirements, the
appraisal inspection will be qualified.
6.2.4.3 Accidental failure
When the appraisal department determines that a certain unqualified item of the motor
is an isolated accidental failure, it is allowed to take a spare prototype from each
submitted prototype to replace the failed prototype, to make up all the items before the
failure occurred (including the time of failure). Then continue the test. If any item of
another prototype does not meet the requirements, the appraisal inspection will fail.
6.2.5 Appraisal inspection of products of the same type
When two or more motor models of a certain type with the same frame size are
submitted for appraisal inspection at the same time, four prototypes of each model shall
be submitted. All prototypes shall pass the Group A inspection in quality consistency;
6.3 Quality consistency inspection
Quality consistency inspection is divided into Group A and Group C inspection.
a) Group A inspection is an exit-factory inspection, which is conducted to verify
whether motor products meet conventional quality requirements;
b) Group C inspection is a periodic inspection.
6.3.1 Group A inspection
The Group A inspection items and basic sequence shall be carried out as specified in
Table 13.
6.3.2 Group C inspection
The items and basic sequence of Group C inspection shall be carried out as specified in
Table 13.
6.3.2.1 Inspection timing and cycle
In any of the following situations, Group C inspection shall generally be carried out.
6.3.2.2 Inspection rules
The items and basic sequence of Group C inspection shall be carried out in accordance
with Table 13.
7 Preparation for delivery
7.1 General provisions
Unless otherwise specified, the delivered motor shall be a product manufactured after
design validation and passed Group A inspection.
7.2 Packaging
Motor packaging shall comply with the requirements of JB/T 8162-1999.
Manufacturers shall ensure that the motor can be effectively protected through
packaging.
7.3 Transportation
7.5 Warranty period
The warranty period is the manufacturer's commitment to the user, regarding the correct
storage and usage period of the motor.
8 User services
The manufacturer shall stipulate technical services after the motor is delivered. It shall
be able to provide technical services in a timely manner, when users have needs.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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