CN106405417B - A kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen - Google Patents
A kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen Download PDFInfo
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- CN106405417B CN106405417B CN201610781254.0A CN201610781254A CN106405417B CN 106405417 B CN106405417 B CN 106405417B CN 201610781254 A CN201610781254 A CN 201610781254A CN 106405417 B CN106405417 B CN 106405417B
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
A kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen, belongs to low temperature electric machine testing field.This method, which is included in motor assembling process, carries out Insulation Test, is sealed performance test to motor, carries out room temperature performance test to motor, carries out liquid hydrogen performance test to motor, carries out liquid hydrogen reliability five steps of accumulative test to motor.By the way that low temperature electric machine cold test and low-temperature test are combined, motor test is combined with electric-motor pump Combined Trials, motor room temperature performance, cryogenic property and reliability can be fully assessed and verified, operation temperature area (+100~-253 DEG C) range is wide.In existing low temperature field (mostly liquefied natural gas, -161 DEG C) in the case that motor test method is rarely reported, the present invention covers the motor product in existing low temperature field substantially, and can be used as the commercialization test that important link realizes low temperature electric machine, carries out reliability assessment to batch products.
Description
Technical field
The present invention relates to a kind of aerospaces or industrial circle to be situated between with internal soak hydrogen medium (≈ -253 DEG C) or liquid nitrogen
Permanent magnet synchronous motor (hereinafter referred to as low temperature electric machine) testing method of matter (≈ -196 DEG C) transfer tube belongs to low temperature electric machine survey
Examination field.
Background technique
China's space transporter engine has carried out the development work of liquid hydrogen circulating precooling, the power of pre-cooling in recent years
Element is by pump and motor form, and the two uses integral structure scheme, and motor and pump are coaxial, Electric-motor driven pumps rotation, band hydrodynamic
Hydrogen circulates, and then to starting and its transportation system cools down.Motor uses vector control without position sensor structure, belongs to
China's developing products for the first time.
Currently, Aeronautics and Astronautics, industrial circle are mainly room temperature and high temperature (≈+200 with motor product operating ambient temperature
DEG C), it is different from above-mentioned motor, low temperature electric machine rotor is immersed in liquid hydrogen medium, and operating temperature is extremely low.Therefore it is removed in production process
Outside cold test, also need to carry out motor test at low temperature.Currently, low temperature electric machine product is mostly used in LNG pump both at home and abroad, i.e., it is electric
Machine, which is integrally immersed in liquefied natural gas medium, drives pump work, and the test principle about LNG pump low temperature electric machine is rarely reported,
Low temperature electric machine product and testing method under liquid hydrogen temperature are even more to have not been reported.
Summary of the invention
Technology of the invention solves the problems, such as: having overcome the deficiencies of the prior art and provide and has impregnated liquid hydrogen forever inside a kind of
Magnetic-synchro motor test method realizes the test to low temperature electric machine properties of product and reliability.
The technical solution of the invention is as follows: a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen, including such as
Lower step:
Step 1: carrying out Insulation Test in motor assembling process, and test enters step 2 after passing through, if test is not led to
It crosses, then motor product is unqualified；
Step 2: performance test is sealed to the motor assembled, test enters step 3 after passing through, if test is not
Pass through, then motor product is unqualified；
Step 3: carrying out room temperature performance test to motor, and test passes through, and enters step four, otherwise motor product is unqualified；
Step 4: motor liquid hydrogen performance test is carried out:
(s4.1) motor and pump group are filled, to the interface and all external interfaces progress once sealing between motor and pump
It can test, primary insulation resistance test, the megger test refers to the insulation between motor electric connector contact pin and casing
Resistance test, test pass through, and enter step (s4.2), otherwise motor product is unqualified；
(s4.2) by the motor and pump access liquid hydrogen cyclic test system after assembling, electricity is determined by adjusting pressure and flow
Machine load torque, if the electric moter voltage of detection, electric current, revolving speed, in scope of design, test passes through, and enters step five, no
Then motor product is unqualified；
Step 5: the accumulative test of liquid hydrogen reliability is carried out to motor:
(s5.1) carry out reliability assessment according to Weibull distribution, obtain number of motors that the accumulative test of reliability needs and
The working time of every motor；
(s5.2) every motor carries out liquid hydrogen test for a long time according to the calculated working time, if the motor electricity of detection
Pressure, electric current, revolving speed are in scope of design, then test passes through, and otherwise motor product is unqualified.
The implementation method of the step 1 are as follows:
(2.1) winding is embedded in stator core and after completing shaping, carry out a voltage-withstand test and first winding three-phase it
Between turn-to-turn insulation test, test pass through after enter step (2.2), if test do not pass through, motor product is unqualified；
(2.2) to after winding and stator core dipping lacquer carry out primary insulation resistance test, a voltage-withstand test and once around
Turn-to-turn insulation test between group three-phase, the megger test refer to that the insulation resistance between winding and stator core is surveyed
Examination, test enter step (2.3) after passing through, if test does not pass through, motor product is unqualified；
(2.3) winding and stator core are fitted into casing, carry out a voltage-withstand test, test enters step after passing through
(2.4), if test does not pass through, motor product is unqualified；
(2.4) electric connector is packed into casing, and connects winding and electric connector, carry out a voltage-withstand test and it is primary absolutely
Edge resistance test, the megger test refer to that the megger test between electric connector contact pin and casing, test pass through
After enter step (2.5), if test do not pass through, motor product is unqualified；
(2.5) stator completed to assembly is potted, and after encapsulating, then carries out a voltage-withstand test and primary insulation survey
Examination, if test does not pass through, motor product is unqualified.
The voltage range of voltage-withstand test is 2000V-2200V in step (2.1), and leakage current range is 0-5mA, turn-to-turn insulation
The voltage range of test is 2700V-2800V, the voltage of voltage-withstand test and voltage-withstand test in step (2.1) in step (2.2)
Voltage is no more than 20% compared to drop volume, and the voltage of turn-to-turn insulation test is tested with turn-to-turn insulation in step (2.1) in step (2.2)
Voltage be no more than 20% compared to drop volume, the voltage of megger test is 500V, resistance range in step (2.2) and (2.4)
For 500M Ω~infinity, the voltage and step (2.2) phase of voltage-withstand test and turn-to-turn insulation test in step (2.3) and (2.4)
Together.
The implementation method of the step 2 are as follows:
(4.1) sealing frock of through-hole is had in housing inlet installation center, sealing frock passes through sealing ring or sealing
Pad is connect with casing, is welded with pipe fitting on sealing frock through-hole；
(4.2) pipe fitting is connect with gas source, after air inlet and pressure maintaining, with instrument to between motor and pump interface and institute
There is external interface to carry out air-tightness test, test unloads sealing frock after passing through, if test does not pass through, motor product is not
It is qualified.
The implementation method of the step 3 are as follows:
(5.1) primary insulation performance test is carried out to motor, test enters step (5.2) after passing through, if test is not led to
It crosses, then motor product is unqualified；
(5.2) motor is connect with no sensor variable frequency drive controller, carries out the test of room temperature no-load performance, if detection
Electric moter voltage, electric current, revolving speed in room temperature zero load scope of design, then test pass through, enter step (5.3), otherwise motor produce
Product are unqualified；
(5.3) for motor access load, carry out load performance test, if detection electric moter voltage, electric current, revolving speed and turn
Square is in the scope of design of respective load, then room temperature load testing passes through, and otherwise motor product is unqualified.
The implementation method of performance test is sealed in the step (s4.1) are as follows:
(6.1) sealing frock of through-hole is had in the inlet installation center of pump, sealing frock passes through sealing ring or sealing
Pad is connect with casing, is welded with pipe fitting on sealing frock through-hole；
(6.2) pipe fitting is connect with gas source, after air inlet and pressure maintaining, with instrument to between motor and pump interface and institute
There is external interface to carry out air-tightness test, test unloads sealing frock after passing through, if test does not pass through, motor product is not
It is qualified.
Compared with the prior art, the invention has the advantages that:
(1) present invention employs to the method for carrying out turn-to-turn insulation test before and after stator shaping, can further screen because
Shaping operation causes the product of insulation harm, guarantees the insulating reliability of stator.
(2) present invention tests the external sealing performance of low temperature electric machine by sealing frock, can simply, effectively verify
The leakproofness of motor external interface prevents inflammable and explosive medium from leaking out, and guarantees safety when work.
(3) present invention has been all made of insulation against ground test in each step assembling process of stator, can general warranty motor it is logical
The External Insulation of electrical components, it is ensured that the safety of personnel's operation.
(4) present invention carries out the accumulative test of liquid hydrogen reliability to motor using the analysis method for reliability of Weibull distribution,
To which verifying is the same as the global reliability of batch low temperature electric machine product.
(5) present invention carries out comprehensive performance test side to low temperature electric machine cold test and low-temperature test due to using
Method ensure that low temperature electric machine in the test coverage of wide warm area (+100~-253 DEG C) interior performance, overcomes routine test system
Test incomplete, the bad defect of spreadability.Using the low temperature electric machine of the method for the present invention test passes liquid hydrogen can be full of in inside
In the case where medium or other cryogenic medias, transfer tube steady operation meets system dynamic demand.
Detailed description of the invention
Fig. 1 is flow chart of the present invention；
Fig. 2 is machine winding and stator core construction schematic diagram；
Fig. 3 is the electric machine structure schematic diagram with sealing frock；
Fig. 4 is motor room temperature performance test schematic diagram；
Fig. 5 is that motor liquid hydrogen tests schematic diagram.
Specific embodiment
A specific embodiment of the invention is further described in detail with reference to the accompanying drawing.
The invention proposes a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen, by by low temperature electric machine room temperature
Test and low-temperature test combine, and motor test is combined with electric-motor pump Combined Trials, can be to motor room temperature performance, low temperature
Performance And Reliability is fully assessed and is verified.As shown in Figure 1, detailed process of the invention is as follows:
Step 1: Insulation Test is carried out in motor assembling process.
As shown in Fig. 2, winding 1 is being embedded in stator core 2 and after completing shaping, carry out a voltage-withstand test (winding 1 with
Between stator core 2, the voltage range of voltage-withstand test is 2000V-2200V), a turn-to-turn insulation tests (A, B, C of winding 1
Between three-phase, the voltage range of turn-to-turn insulation test is 2700V-2800V), carries out primary insulation resistance test (winding after dipping lacquer
Between 1 and stator core 2), voltage-withstand test (voltage value drops volume and is no more than 20%) He Yici turn-to-turn insulation test (voltage value
20%) drop volume is no more than.As shown in figure 3, winding 1 and stator core 2 are fitted into casing 3 and electric connector 4 loads onto casing 3
Later, primary insulation resistance test and a voltage-withstand test (consistent with voltage after dipping lacquer) are carried out.It is potted later, is filled
It is honored as a queen, then carries out primary insulation resistance test and a voltage-withstand test (consistent with voltage after dipping lacquer).Megger test twice
Voltage be 500V, resistance range be 500M Ω~infinity.
In the above process, a test failure thinks that motor product is unqualified.It is entered step after whole test passes
Two.
Step 2: performance test is sealed to motor.
As shown in figure 3, installing sealing frock 7 at casing 3 and pump interface, 7 center of sealing frock is provided with through-hole, seals work
It filling 7 to connect by sealing ring or gasket with casing 3, pipe fitting 8 is welded on sealing frock 7, pipe fitting 8 and through-hole are coaxial,
For gas source from air inlet from pipe fitting 8, pressure is 0~1MPa, uses instrument (such as helium mass spectrometer leak detector) to all zero after pressure maintaining 10min
Part connecting portion surrounding (between casing 3 and end cap 5 I at, at II between casing 3 and electric connector 4, casing 3 and blanking cover
Between 6 III at) and 4 panel of electric connector on IV at carry out air-tightness test.If any other external interfaces, successively class
Push away completion test.
Test enters step 3 after passing through, if test does not pass through, motor product is unqualified.
Step 3: room temperature performance test is carried out to motor.
Sealing frock 7 to be unloaded, insulation performance test is carried out, test carries out room temperature zero load and load performance test after passing through,
The performance parameters such as electric moter voltage, electric current, revolving speed are detected whether in scope of design, if test passes through, and enters step
Four, otherwise motor product is unqualified.Motor is controlled when working using no sensor variable frequency drive controller 9, load performance
Test can carry real load 10 or carry out on fictitious load testing stand.As shown in Figure 4.
Step 4: liquid hydrogen performance test is carried out to motor.
Motor and pump group are filled, between motor and pump interface and all external interfaces carry out once sealing performance inspection again
It surveys and insulation resistance detects, carry out liquid hydrogen test again after qualified.When leakage test, sealing frock is installed in the inlet of pump, is surveyed
It is identical as step 2 to try process.
Access liquid hydrogen cyclic test system as shown in Figure 5, in the liquid hydrogen cyclic test system, motor and pump pass through pipeline
With liquid hydrogen tank (LH2) connection.Electric motor load torque is determined by adjusting pressure and flow, and electricity is detected by parameter measurement instrument
Whether the performance parameters such as electromechanical pressure, electric current, revolving speed are in scope of design, if test passes through, and enters step five, otherwise
Motor product is unqualified.
5) the accumulative test of liquid hydrogen reliability is carried out to motor.
Reliability assessment is carried out according to Weibull distribution using following formula,
By RELIABILITY INDEX R (X0), working time X0, γ=0.3 empirical risk degree β=1-, form parameter m substitute into formula
In, obtain the working time X of number of motors n and every motor that the accumulative test of reliability needsRCombination.
In order to reduce test products quantity, can be realized by increasing the separate unit product working time.Wherein, form parameter m can
Value 3.5.Every motor carries out liquid hydrogen according to the calculated working time and tests for a long time, pilot system and test content and the
Four steps are the same, if the electric moter voltage of detection, electric current, revolving speed, in scope of design, test passes through, and otherwise motor product does not conform to
Lattice.
Embodiment: experiment examination is carried out with permanent magnet synchronous motor of the method for the present invention to internal soak hydrogen.Pass through this
The motor stator insulated performance in assembling process is tested in Insulation Test in invention.Before dipping lacquer, the voltage of voltage-withstand test is
2200V, leakage current value are no more than 2mA, and the voltage of turn-to-turn insulation test is 2800V；After dipping lacquer, megger test result is nothing
Poor big, the voltage of voltage-withstand test is 1800V, and leakage current is no more than 2mA, and the voltage of turn-to-turn insulation test is 2200V；Stator is packed into
After casing, voltage-withstand test voltage value is 1800V, and leakage current is no more than 2mA；Electric connector is packed into casing, the voltage of voltage-withstand test
For 1800V, leakage current is no more than 2mA, and megger test result is infinity, and after encapsulating, the voltage of voltage-withstand test is
1800V, leakage current are no more than 2mA, and megger test result is infinity.After all tests are completed and passed through, then assembled
Insulation Test result in journey is qualification.
After motor installs sealing frock, it is passed through the 100% pure helium of 0.5MPa from air inlet, after pressure maintaining 10min, with helium matter
The leak rate for composing leak detector detection all external interfaces of motor, is no more than 10-7Pa.m3/s.Leakage test result is qualification.
Motor is mounted on progress room temperature performance test on fictitious load testing stand.Motor torque is adjusted by fictitious load
Size.Motor is driven and is controlled by ensorless control variable-frequency power sources.Motor major parameter is shown in Table 1.It is tied by test
For fruit it is found that major parameter is in scope of design, room temperature performance test results are qualified.
1 room temperature performance test data of table
| Pilot project | Voltage (V) | Electric current (A) | Revolving speed (rpm) | Torque (N.m) | Power (kW) |
| Room temperature no-load test | 262±10 | 0.9±0.2 | 10000±50 | 0 | 0.1 |
| Room temperature load test | 265±10 | 5±0.5 | 10000±50 | 2 | 2.1 |
Motor and pump are connected, once sealing performance test is carried out, leak rate is no more than 10-7Pa.m3/ s, test result are closed
Lattice.It carries out primary insulation resistance test again, it is accessed into liquid hydrogen pilot system together after qualified.Liquid hydrogen is cooled to motor temperature
At a temperature of, it adjusts the parameters such as pressure, the flow of pump and determines motor torque value.Motor by ensorless control variable-frequency power sources into
Row driving and control.Motor major parameter is shown in Table 2.By test result it is found that major parameter demonstrates electricity in scope of design
The performance of machine product.
2 liquid hydrogen performance test data of table
| Pilot project | Voltage (V) | Electric current (A) | Revolving speed (rpm) | Torque (N.m) | Power (kW) |
| Liquid hydrogen performance test | 270±10 | 4.6±0.5 | 10000±50 | 2 | 2.1 |
Electric-motor pump reliability index are as follows: be not less than 0.9999 under the conditions of 0.7 confidence level, motor single stream time is not
Lower than 80min.Reliability assessment, form parameter value 3.5 are carried out according to Weibull distribution.It extracts in batch motor product 5
Platform carries out the accumulative test of liquid hydrogen reliability, and test situation is shown in Table 3.Motor performance test data is as shown in table 2 in test.Reliability
After accumulative test, reliability index is obtained greater than 0.9999.
3 reliability test situation of table
| Increment quantity (platform) | Test period (h) | Cumulative reliability index |
| 5 | 10 | 0.9999374 |
By above-mentioned test procedure can be seen that the present invention can to motor room temperature performance, cryogenic property and reliability into
Row fully assesses and verifying, operation temperature area (+100~-253 DEG C) range are wide.Existing low temperature field (mostly liquefied natural gas ,-
161 DEG C) in the case that motor test method is rarely reported, the present invention covers the motor product in existing low temperature field substantially, and
It can be used as the commercialization test that important link realizes low temperature electric machine, according to reliability estimation method provided in the present invention to batch
Product carries out reliability demonstration.
The content that description in the present invention is not described in detail belongs to the well-known technique of professional and technical personnel in the field.
Claims (6)
1. a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen, it is characterised in that include the following steps:
Step 1: carrying out Insulation Test in motor assembling process, and test enters step 2 after passing through, if test does not pass through,
Then motor product is unqualified；
Step 2: performance test is sealed to the motor assembled, test enters step 3 after passing through, if test is not led to
It crosses, then motor product is unqualified；
Step 3: carrying out room temperature performance test to motor, and test passes through, and enters step four, otherwise motor product is unqualified；
Step 4: motor liquid hydrogen performance test is carried out:
(s4.1) motor and pump group are filled, between motor and pump interface and all external interfaces carry out the examination of once sealing performance
It tests, primary insulation resistance test, the megger test refers to the insulation resistance between motor electric connector contact pin and casing
Test, test pass through, and enter step (s4.2), otherwise motor product is unqualified；
(s4.2) by the motor and pump access liquid hydrogen cyclic test system after assembling, determine that motor is negative by adjusting pressure and flow
Set torque enters step five if the electric moter voltage of detection, electric current, revolving speed, in scope of design, test passes through, otherwise electric
Machine product is unqualified；
Step 5: the accumulative test of liquid hydrogen reliability is carried out to motor:
(s5.1) reliability assessment is carried out according to Weibull distribution, obtains the accumulative number of motors for testing needs of reliability and every
The working time of motor；
Reliability assessment is carried out according to Weibull distribution using following formula,
By RELIABILITY INDEX R (X0), working time X0, γ=0.3 empirical risk degree β=1-, form parameter m substitute into formula in, obtain
The working time X of the number of motors n and every motor that are needed to the accumulative test of reliabilityRCombination；
(s5.2) every motor carries out liquid hydrogen test for a long time according to the calculated working time, if the electric moter voltage of detection,
Electric current, revolving speed are in scope of design, then test passes through, and otherwise motor product is unqualified.
2. a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen according to claim 1, it is characterised in that: institute
State the implementation method of step 1 are as follows:
(2.1) it after being embedded in stator core by winding and complete shaping, carries out between a voltage-withstand test and first winding three-phase
Turn-to-turn insulation test, test enter step (2.2) after passing through, if test does not pass through, motor product is unqualified；
(2.2) to progress primary insulation resistance test, a voltage-withstand test and first winding three after winding and stator core dipping lacquer
Turn-to-turn insulation test between phase, the megger test refer to the megger test between winding and stator core, survey
It pings and enters step (2.3) later, if test does not pass through, motor product is unqualified；
(2.3) winding and stator core being fitted into casing, carries out a voltage-withstand test, test enters step (2.4) after passing through,
If test does not pass through, motor product is unqualified；
(2.4) electric connector is packed into casing, and connects winding and electric connector, carry out a voltage-withstand test and primary insulation electricity
Resistance test, the megger test refer to that the megger test between electric connector contact pin and casing, test pass through laggard
Enter step (2.5), if test does not pass through, motor product is unqualified；
(2.5) stator completed to assembly is potted, and after encapsulating, then carries out a voltage-withstand test and primary insulation test, such as
Fruit test does not pass through, then motor product is unqualified.
3. a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen according to claim 2, it is characterised in that: step
Suddenly the voltage range of voltage-withstand test is 2000V-2200V in (2.1), and leakage current range is 0-5mA, the voltage of turn-to-turn insulation test
Range is 2700V-2800V, and the voltage of voltage-withstand test drops compared with the voltage of voltage-withstand test in step (2.1) in step (2.2)
Volume is no more than 20%, and the voltage of turn-to-turn insulation test is compared with the voltage that turn-to-turn insulation in step (2.1) is tested in step (2.2)
Drop volume is no more than 20%, and the voltage of megger test is 500V in step (2.2) and (2.4), resistance range for 500M Ω~
Infinity, voltage-withstand test and the voltage of turn-to-turn insulation test are identical as step (2.2) in step (2.3) and (2.4).
4. a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen according to claim 1, it is characterised in that: institute
State the implementation method of step 2 are as follows:
(4.1) have the sealing frock of through-hole in housing inlet installation center, sealing frock by sealing ring or gasket with
Casing connects, and is welded with pipe fitting on sealing frock through-hole；
(4.2) pipe fitting is connect with gas source, after air inlet and pressure maintaining, with instrument between motor and pump interface and it is all externally
Interface carries out air-tightness test, and test unloads sealing frock after passing through, if test does not pass through, motor product is unqualified.
5. a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen according to claim 1, it is characterised in that: institute
State the implementation method of step 3 are as follows:
(5.1) primary insulation performance test being carried out to motor, test enters step (5.2) after passing through, if test does not pass through,
Motor product is unqualified；
(5.2) motor is connect with no sensor variable frequency drive controller, carries out the test of room temperature no-load performance, if the electricity of detection
Electromechanical pressure, electric current, revolving speed are then tested and are passed through, enter step (5.3) in room temperature zero load scope of design, and otherwise motor product is not
It is qualified；
(5.3) it is motor access load, load performance test is carried out, if electric moter voltage, electric current, revolving speed and the torque of detection exist
In the scope of design of respective load, then room temperature load testing passes through, and otherwise motor product is unqualified.
6. a kind of internal permanent magnet synchronous motor test method for impregnating liquid hydrogen according to claim 1, it is characterised in that: institute
State the implementation method that performance test is sealed in step (s4.1) are as follows:
(6.1) have the sealing frock of through-hole in the inlet installation center of pump, sealing frock by sealing ring or gasket with
Casing connects, and is welded with pipe fitting on sealing frock through-hole；
(6.2) pipe fitting is connect with gas source, after air inlet and pressure maintaining, with instrument between motor and pump interface and it is all externally
Interface carries out air-tightness test, and test unloads sealing frock after passing through, if test does not pass through, motor product is unqualified.
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