1.1 Scope
This standard is applicable to all rotating electrical machines except for TB 2436(IEC 60349, IEC 61377) traction electric machine.
Electric machines specified in this standard may also meet the requirements of other replaced, modified or supplementary international and IEC standards, such as GB 3836 (IEC 60079) and GB/T 7060 (IEC 60092).
NOTE If some provisions in this standard must be modified for special purposes such as radiation prevention, then all other provisions, if applicable, are still valid.
1.2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 156-1993 Standard Voltage (IEC 60038: 1983)
GB/T 321-1980 Preferred numbers and preferred number series ( ISO 497: 1973,eqv)
GB/T 1993-1993 Cooling methods for rotating electrical machines (IEC 60034-6: 1991,eqv)
GB/T 2900.25-1994 Electrotechnical terminology－Rotating electrical machines (IEV 50 (411): 1984,neq)
GB/T 4026-1992 Identification of electric equipment terminals and of terminations of certain designated conductors, including general rules for an alphanumeric system (IEC 60445: 1988,idt)
GB 4343-1995 Limits and methods of measurement of radio disturbance characteristics of electrical motor-operated and thermal appliances for household and similar purposes,electric tools and similar electric apparatus (CISPR 14: 1993,eqv)
GB/T 4772-1999 Dimensions and output series for rotating electrical machines (IEC 60072,idt)
GB 4824-1996 Limits and methods of measurement of electromagnetic disturbance characteristics of industrial scientific and medical (ISM) radio frequency equipment (CISPR11: 1990,neq)
GB/T 4942.1-1985 Classification of degrees of protection provided by enclosures for rotating machines (IEC 60034-5: 1981,eqv)
GB/T 5226.1-1996 Electrical equipment of industrial machines. Part 1: General requirements (IEC 60204-1: 1992,eqv)
GB/T 6113.1-1995 Specifications for radio disturbance and immunity measuring apparatus (CISPR 16: 1993,eqv)
GB/T 7064-1996 Requirements for turbine type synchronous machine (IEC 60034-3: 1988,neq)
GB/T 13394-1992 Letter Symbols to be Used in Electrical Technology--Symbols for Quantities to be Used for Rotating Electrical Machines(IEC 60027-4: 1985,eqv)
GB/T 14821.1-1993 Electrical installations of buildings－Protection against electric shock(IEC 60364-4-41:1992 , eqv)
JB/T 5980-1992 Voltage range of electrical installations (IEC 60449: 1973, eqv)
JB/T 7062-1993 Semiconductor Converters: Identification Code for Converter Connections(IEC 60971: 1989,eqv)
JB/T 8158-1995 Starting performance of single-speed three-phase cage asynchronous motors for voltages up to and including 660 V(IEC 60034-12: 1980, eqv)
IEC 60027-1: 1992 Letter Symbols to be Used in Electrical Technology - Part 1: General
IEC 60034-2: 1972 Rotating electrical machines; part 2: methods for determining losses and efficiency of rotating electrical machinery from tests (excluding machines for traction vehicles)
IEC 60034-15: 1995 Rotating electrical machines - Part 15 Impulse voltage withstand levels of rotating a.c. machines with form-wound stator coils
IEC 60034-17: 1992 Rotating electrical machines - Part 17 Cage induction motors when fed from converters - Application guide
IEC 60085:1984 thermal evaluation and classification of electrical insulation
IEC 60279:1969 Measurement of the winding resistance of an a.c. machine during operation at alternating voltage
2 Definitions
For the purposes of this standard, terms and definitions specified in GB/T 2900.25 and the following ones apply to.
As regards the cooling and coolant, except for those specified in 3.17~3.22, others shall see GB/T 1993-1993.
"Agreement" in this standard refers to "agreement reached between the manufacturer and users".
2.1 Rated value
A value is set generally by the manufacturer for the electric machines under prescribed operation condition.
2.2 Rating
It refers to a group of rated values and operation conditions.
2.3 Rated output
It is the output value in the rating.
2.4 Load
Values of the total electric quantities and quantities to be used for the machinery are applied to the electrical machines by circuit or machinery at given time.
2.5 No-load (operation)
It refers to the rotation regime when the electric machine is in zero power output (others are all normal operation conditions).
2.6 Full load
It refers to load applied to the electric machine when it is in rating operation.
2.7 Full load value
It refers to value of the quantities to be used for the electric machine when it is in full load running.
NOTE This concept is applicable to power, torque, current and rotation speed, etc.
2.8 De-energized and rest
It refers to the state in which the electric machine is not running and is de-energized or is involved with no mechanical energy input.
2.9 Duty
It is description of a series of loading conditions which are withstood by the electric machine, including starting, electric braking, no-load, de-energized and rest and their duration and sequence.
2.10 Duty type
Duty may be classified into continuous, short-time, periodic or nonperiodic types. Periodic duty includes one or more constant loads prescribed with duration; and loads and rotation speed of nonperiodic duty generally varies within the permissible range of operation.
2.11 Cyclic duration factor
It is the ratio of the load (including starting and electric braking) duration to the whole period in the working period, indicated in %.
2.12 Locked rotor torque
The minimum measured value of torque is generated on the rotor of electric motor under rated frequency and rated voltage and when the motor rotors are locked at all the corners.
2.13 Locked rotor current
The effective value of the maximum steady-state current is input from the power supply circuit under rated frequency, rated voltage and when the motor rotors are locked at all the corners.
2.14 Pull-up torque (of an a.c. motor)
Minimum steady-state asynchronous torque is generated between zero rotation speed and rotation speed corresponding to the breakdown torque of electric motor under rated voltage and rated frequency.
This definition is not applicable to asynchronous motors whose torque uninterrupted descends with increase of the rotation speed.
NOTE Under some specific rotation speeds, except for the steady-state asynchronous torque, there still may generate harmonic synchronous speed which forms a functional relationship with the power angles of the motor rotors.
Under these rotation speeds, acceleration torque corresponding to the power angles of some motor rotors may be negative values.
Experience and calculation show that this is a kind of unstable running state, harmonic synchronousnizing torque will not hinder the acceleration of electric motor, so it may be eliminated from this definition.
2.15 Breakdown torque (of an a.c. motor)
Maximum steady-state asynchronous torque is generated due to no-rotation speed anticlimax of electric motors under rated voltage and rated frequency.
This definition is not applicable to asynchronous motors whose torque uninterrupted descends with increase of the rotation speed.
2.16 Pull-out torque (of a synchronous motor)
Breakdown torque is generated at synchronous speed when the synchronous motor is under rated voltage, rated frequency and rated magnetic field current.
2.17 Cooling
It is a kind of heat transfer process. Heat generated in the electric machine due to losses is transferred to primary coolant, which may be replaces continuously or be cooled by secondary coolant in the cooler.
2.18 Coolant
Gas or liquid medium transfers heat.
2.19 Primary coolant
It refers to gas or liquid medium whose temperature is lower than certain parts of the electric machine. Such gas or liquid medium contacts with the parts and carries away the heat librated by the parts.
2.20 Secondary coolant
It refers to gas or liquid medium whose temperature is lower than the primary coolant. Such gas or liquid medium carries away the heat liberated by primary coolant through cooler or external motor surface.
2.21 Direct cooled (inner cooled) winding1)
It is a kind of winding, whose coolant directly contacts with the cooling parts flowing across the hollow conductors, conduits, air ducts or channels as components of the winding inside the major insulation, regardless of its orientation.
2.22 Indirect cooled winding1)
Other windings are excluded from the direct cooled winding.
2.23 Supplementary insulation
Independent insulation is added besides the major insulation in order to prevent electric shock accident due to damage of the major insulation.
2.24 Moment of inertia
It is the sum (integral) of square products of distance (radius) from various quality infinitesimals to the specified axis.
2.25 Thermal equilibrium
It refers to the state in which the temperature rise of the electric machine's heating parts doesn't exceed 2K within 1h.
2.26 Thermal equivalent time constant
It may replace several separate time constants in order to approximately determine the temperature change process in the winding after the current occurs step variation.
2.27 Encapsulated winding
Winding is completely sealed or inclosed by moulding insulation.
2.28 Rated form factor of direct current supplied to a d.c. motor armature from a static power converter
