CN109212414A - Measure the method and apparatus of stator iron loss - Google Patents
Measure the method and apparatus of stator iron loss Download PDFInfo
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- CN109212414A CN109212414A CN201811066481.0A CN201811066481A CN109212414A CN 109212414 A CN109212414 A CN 109212414A CN 201811066481 A CN201811066481 A CN 201811066481A CN 109212414 A CN109212414 A CN 109212414A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/04—Housings; Supporting members; Arrangements of terminals
- G01R1/0408—Test fixtures or contact fields; Connectors or connecting adaptors; Test clips; Test sockets
- G01R1/0425—Test clips, e.g. for IC's
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
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- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Measuring Magnetic Variables (AREA)
- Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)
Abstract
The invention discloses a kind of methods for measuring stator iron loss comprising: first coil is wound on model rotor；The second coil with first coil tight fit is wound on model rotor；After model rotor is placed in stator, the power supply of changeable frequency is connected in first coil via the current measurement part of measuring device；The voltage measuring section of measuring device is connected on second coil；The output voltage of the power supply of changeable frequency is adjusted, until the induced voltage for the second coil that the voltage measuring section of measuring device measures reaches standard value；When the induced voltage of the second coil reaches standard value, the electric current of first coil is flowed through in the measurement of current measurement part；The net power loss of stator core is calculated using measured electric current and voltage；The core loss value of stator core is calculated using the net power loss of stator core calculated.Method of the invention can detect the iron loss of silicon steel sheet of stator core at any time in motor volume manufacturing process, not influenced by technique and product.
Description
Technical field
The present invention relates to stator technology field more particularly to a kind of methods and its equipment for measuring stator iron loss.
Background technique
An important factor for iron loss of stator is influence motor performance, is the important indicator of motor material.For a long time, stator
Iron loss can only pass through the method for detection silicon steel sheet batten, measure the iron loss of silicon steel sheet material, referred to as batten detection method indirectly.
Batten detection method can only take a sample test the core loss property of raw material, directly can not measure and control the iron loss water of finished product stator
It is flat.And stator is in the fabrication process, such as punching press, heat treatment, lamination and stator built-in line will affect its core loss value, influence factor
Including raw material iron loss, material stock thickness, punching press flatness and burr, lamination coefficient and stator lasmination uniformity；Make whole
In a manufacturing process, lacks and reliably detect and control means.
Summary of the invention
The object of the invention is to solve the above problems, provide it is a kind of measure stator iron loss method and set
It is standby.
Above-mentioned purpose to realize the present invention, the present invention provide a kind of method for measuring stator iron loss, comprising:
First coil is wound on model rotor, the second coil with first coil tight fit is wound on model rotor；
It will be wound in the model rotor merging stator of first coil and the second coil, make to keep equal between stator and model rotor
Even air gap；
After model rotor is placed in stator, the power supply of changeable frequency is connect via the current measurement part of measuring device
Onto first coil；
The voltage measuring section of measuring device is connected on second coil；
The output voltage of the power supply of changeable frequency is adjusted, until the second coil that the voltage measuring section of measuring device measures
Induced voltage reach standard value；
When the induced voltage of the second coil reaches standard value, the electric current of first coil is flowed through in the measurement of current measurement part；
The net power loss Pnet of stator core is calculated using measured electric current and voltage；
The core loss value Plosses of stator core is calculated using the net power loss Pnet of stator core calculated.
Wherein, the second coil with first coil tight fit is wound on model rotor and is included the following steps:
After first coil is wound on model rotor, the second coil is wound on the first coil on model rotor around phase
At position.
Wherein, adjust the output voltage of the power supply of changeable frequency, until the voltage measuring section of measuring device measure the
The induced voltage of two coil reaches standard value and includes the following steps:
The alternating current for passing to frequency f to the first coil using power supply, forms alternating flux inside model rotor, with
Just magnetic flux forms closed circuit by air gap, the teeth portion of stator and yoke portion, and the second coil is made to obtain induced voltage；
Power supply is adjusted to the output voltage of first coil, the induced voltage of the second coil is made to reach preset standard value, with
Just the magnetic flux density of stator core reaches preset flux density value at this time.
Wherein, the core loss value Plosses of stator core is calculated using the net power loss Pnet of stator core calculated,
Also need to calculate the net weight Wnet of the stator core.
Wherein, the core loss value Plosses of stator is calculated using the net power loss Pnet of stator core calculated, is used
Following formula:
Plosses=Pnet/Wnet (W/kg).
Wherein, the net power loss Pnet is calculated using following formula:
Pnet=P-Pvolt-Pcore (W)
Wherein: P=power meter reading P ' × 2.5 × 0.2 (W), power meter reading P ' are the power obtained by measuring device
Value；
Pvolt is voltmeter loss, and Pvolt=(Vf × Vf)/5000 (W), Vf is feedback voltage；
Pcore is system loss (W).
Preferably, the net weight of the stator core is calculated using following formula:
Wnet=(W-Wteeth-Wflim)/1000 (kg)
Wherein: W is stator weight (g)；
Wteeth is parts of tooth weight, Wteeth=4.75 × h (g)；
Wfilm is insulation film weight (g).
Preferably, by Magnetic Circuit Method and the preset flux density value of the stator core, it is coil-induced to obtain described second
The preset standard value of voltage.
Wherein, the stator is the stator of non-coiling.
In addition, the embodiment of the present invention also provides a kind of equipment for method as above, comprising: model rotor and to be measured fixed
Son；The power supply of changeable frequency；First coil for being wound on model rotor；For with first coil tight fit and be wound on simulation
The second coil on rotor；Measuring device, including current measurement part and voltage measuring section, the power supply of changeable frequency is via electricity
Flow measurement part is connected in first coil, and voltage measuring section connects the second coil；Wherein, described to be wound with first coil and second
The model rotor of coil is placed in stator, and even air gap is kept between stator and model rotor；Wherein, the institute of changeable frequency is adjusted
The output voltage of power supply is stated, until the induced voltage of the second coil of voltage measuring section measurement reaches standard value, and
When the induced voltage of second coil reaches standard value, the electric current of first coil is flowed through by current measurement part measurement；Its
In, the net power loss Pnet of stator core is calculated using measured electric current and voltage, and utilize stator core calculated
Net power loss Pnet calculate stator core core loss value.
Further, the equipment further includes for the model rotor for being wound with first coil and the second coil to be placed in stator
In and make between stator and model rotor keep even air gap rotor placing device.
Compared with prior art, the method and apparatus of measurement stator iron loss of the invention has the following beneficial effects:
1, method of the invention can detect the iron loss of silicon steel sheet of stator core in motor volume manufacturing process at any time,
It is not influenced by technique and product, it might even be possible to apply a link on assembly line as detection, realize to stator core
Very detect.
2, method of the invention can obtain by adjusting the energization frequency of first coil and the induced voltage of the second coil
The core loss value of stator core under to any magnetic flux density and optional frequency, to adapt to different electric machine frequencies and design of electrical motor
When magnetic flux density setting.
The present invention is described in detail with reference to the accompanying drawing.
Detailed description of the invention
Fig. 1 is the flow chart of the measurement stator core iron loss method of the embodiment of the present invention；
Fig. 2 be the embodiment of the present invention be wound with first coil, the second coil model rotor merging stator in schematic diagram；
Fig. 3 is the schematic diagram that the embodiment of the present invention winds first coil, the second coil on model rotor；
Fig. 4 is the schematic diagram of the equipment of the present embodiment measurement stator core iron loss of the present invention.
Specific embodiment
As shown in Figure 1, this method includes as follows for a kind of flow chart for the method for measuring stator iron loss provided by the invention
Step:
First coil is wound on model rotor, the second coil with first coil tight fit is wound on model rotor；
It will be wound in the model rotor merging stator of first coil and the second coil, make to keep equal between stator and model rotor
Even air gap；
After model rotor is placed in stator, the power supply of changeable frequency is connect via the current measurement part of measuring device
Onto first coil；
The voltage measuring section of measuring device is connected on second coil；
The output voltage of the power supply of changeable frequency is adjusted, until the second coil that the voltage measuring section of measuring device measures
Induced voltage reach standard value；
When the induced voltage of the second coil reaches standard value, the electric current of first coil is flowed through in the measurement of current measurement part；
The net power loss Pnet of stator core is calculated using measured electric current and voltage；
The core loss value Plosses of stator core is calculated using the net power loss Pnet of stator core calculated.
Specifically, the method for measurement stator iron loss of the embodiment of the present invention includes the following steps:
S01, first coil and the second coil, and the mould that first coil and the second coil will be wound with are wound on model rotor
Quasi- rotor is placed in stator to be measured
S11, first coil and the second coil are wound on model rotor
First coil is wound outside model rotor, then, by the second coil be wound on the first coil on model rotor institute around
Same position at, so that the second coil and first coil are a tight fit at the same position of model rotor (as shown in Figure 2).
In wound around coil, the second coil can also be first wound outside model rotor, then, first coil is wound on simulation
The second coil on rotor around same position at, so that the second coil is a tight fit in the identical of model rotor with first coil
At position.
It should be noted that the stator of the embodiment of the present invention is the stator of non-coiling.
S12, the model rotor for being wound with first coil and the second coil is placed in stator to be measured
After winding first coil and the second coil outside model rotor, by rotor placing device will be wound with first coil and
The model rotor of second coil is placed in stator, and makes to keep uniform air gap between stator and model rotor.Wherein, stator is by fixed
Sub-folder tool is fixed on testing stand.
S02, after model rotor is placed in stator, the power supply of first coil and changeable frequency is connected, and by the second line
Circle is connect with the voltage measuring section of measuring device
After model rotor is placed in stator, the power supply of changeable frequency is connect via the current measurement part of measuring device
Onto first coil, when so as to for first coil indirect current, can make to form alternating flux inside model rotor, magnetic flux passes through mould
Air gap, stator teeth and stator core between quasi- rotor and stator form closed circuit, so that second in alternating magnetic field
Coil can get induced voltage (i.e. counter electromotive force), so as to measure the second coil by the voltage measuring section of measuring device
Induced voltage, the electric current that first coil is flowed through by the measurement of current measurement part.
S03, adjust changeable frequency power supply output voltage, until measuring device voltage measuring section measure second
The induced voltage of coil reaches standard value, and flows through the electric current S31 of first coil using the measurement of current measurement part, adjusts frequency
The output voltage of variable power supply makes the induced voltage of the second coil reach standard value and includes the following steps:
The alternating current that preset frequency is f is passed to first coil using the power supply of changeable frequency, so as in internal rotor
Alternating flux is formed, magnetic flux forms closed circuit by air gap, stator teeth and the stator core between model rotor and stator, makes
The second coil obtained in alternating flux obtains corresponding induced voltage；
Then, output voltage of the power supply to first coil of changeable frequency is adjusted, until making the induced voltage of the second coil
Reach preset standard value E, default flux density value when reaching design motor so as to the magnetic flux density of stator core at this time
B。
Wherein it is possible to pass through the flux density value of preset stator core when the Magnetic Circuit Method and design of electrical motor of the prior art,
The preset standard value of the second coil-induced voltage is obtained, thus in test, by the power supply of changeable frequency to first coil
Output voltage is adjusted, and the induced voltage of the second coil is made to reach preset standard value, and the magnetic flux of stator core can be made close
Degree reaches preset flux density value.
S32, when the induced voltage of the second coil reaches standard value, utilize measuring device current measurement part measure stream
Cross the electric current of first coil
S04, the net power loss Pnet of stator core and the iron of stator core are calculated using measured electric current and voltage
Damage value Plosses
The determination of S41, stator core net power loss Pnet
After the induced voltage for measuring the electric current for flowing through first coil and the second coil, power supply output alternating current can get
Power P ' (power can be measured by measuring device such as power meter, can also be by calculating gained), then, is converted using formula 1
Power P afterwards:
P=power meter reading P ' × 2.5 × 0.2 (W) (formula 1)
After power P after being converted, it is calculated and determines using power P, voltmeter loss Pvolt, system loss Pcore
The net power loss Pnet of son, net power loss Pnet do not include the heating loss of first coil, calculate net power loss
The formula of Pnet is as follows:
Pnet=P-Pvolt-Pcore (W) (formula 2)
Wherein, voltmeter loss Pvolt is calculated by following formula:
Pvolt=(Vf × Vf)/5000 (W) (formula 3)
Vf in formula 3 is feedback voltage, and 5000 be fixed resistance value.
Wherein, system loss Pcore is the whole system loss measured by measuring device.
Stator core S42, the net weight for calculating stator core
According to the weight W (g), parts of tooth weight Wteeth (g) and insulation film weight Wfilm (g) of stator, pass through
Following formula calculates the net weight Wnet (g) of the stator core of stator:
Wnet=(W-Wteeth-Wflim)/1000 (kg) (formula 4)
Wherein, parts of tooth weight Wteeth can be calculated by following formula:
Wteeth=4.75 × h (g) (formula 5)
Wherein, h represents the tooth height of stator parts of tooth.
S43, the core loss value for calculating stator
By calculating the net power loss Pnet of resulting stator core and the net weight of stator core, pass through following formula meter
Calculate the core loss value Plosses of stator:
Plosses=Pnet/Wnet (W/kg) (formula 6)
It should be noted that the stator of the non-coiling of the embodiment of the present invention, may include stator lasmination, can not also include
Stator lasmination, above-mentioned formula (4) be suitable for do not include stator lasmination stator core loss value calculating, if stator includes stator stack
Piece need to subtract again the weight of stator lasmination on the basis of above-mentioned formula (4), then apply other formula and calculate core loss value.
Wherein, current measurement part of the invention can use ammeter, and voltage measuring section can use voltmeter, survey
Device is measured other than ammeter, voltmeter, also there is power meter.
It, can be by leading to the ac frequency of first coil and defeated to power supply using the above method of the embodiment of the present invention
The adjustment of voltage out obtains the core loss value of the stator under any magnetic flux density and optional frequency, thus adapt to different electric machine frequencies,
The setting of magnetic flux density.
The present invention also provides a kind of setting suitable for the above method other than providing the method for above-mentioned measurement stator iron loss
Standby, which includes: model rotor 7 and stator to be measured 1；The power supply of changeable frequency can use power supply as shown in Figure 4,
What is connect including AC transformer 6 and with AC transformer 6 is used to adjust the frequency converter 5 of its output frequency；For being wound on simulation
First coil 2 on rotor 7；For with 2 tight fit of first coil and the second coil 3 for being wound on model rotor 7；Measuring device
4, including current measurement part and voltage measuring section, the power supply of changeable frequency be connected to first coil 2 via current measurement part
On, voltage measuring section connects the second coil 3；Wherein, measuring device 4 can be using with current measurement part and voltage measurement
Partial power meter.
Wherein, the model rotor 7 for being wound with first coil 2 and the second coil 3 is placed in stator 1, and stator 1 and model rotor
Even air gap is kept between 7.The output voltage of the power supply of changeable frequency is adjusted, until the second coil 3 of voltage measuring section measurement
Induced voltage reach standard value, and when the induced voltage of the second coil 3 reaches standard value, measured by current measurement part
Flow through the electric current of first coil 2；Wherein, the net power loss Pnet of stator core 1 is calculated using measured electric current and voltage,
And the core loss value of stator core 1 is calculated using the net power loss Pnet of stator core 1 calculated.
It wherein, can be first on model rotor 7 around first coil 2, then, by wound around coil on model rotor 7
Two coil 3 be wound on the first coil 2 on model rotor around same position at；Alternatively, can also first be twined on model rotor 7
Around the second coil 3, then, by first coil 2 be wound on the second coil 3 around same position at.To make the second coil 3 and the
One coil 2 is a tight fit at the same position of model rotor 7 (as shown in Figure 2 and Figure 3).
In addition, equipment of the invention further includes for the stator clamping device of clamping stator 1 to be measured, positioned at stator clamping
Being wound with the model rotor of first coil and the second coil thereon for clamping and being placed on model rotor downwards above device
Rotor downward putting device in stator 1, be electrically connected with above-mentioned each component so as to control each component execute corresponding actions PLC and
The computer containing processing routine being connect with PLC.Preferably, stator clamping device can be using with two or more clampings
The chuck of pawl and the claw driving mechanism for driving the gripper jaw of chuck to act, rotor downward putting device can be using by surging or pneumatically
Or the clip claw mechanism of electric drive, wherein stator clamping device and rotor downward putting device can using it is in the prior art can
To realize the clamping device clamped with release function.
In the following, description carries out the test of stator iron loss using equipment of the invention for using cylinder decentralization model rotor
When process:
1, fix stator on stator workbench stator clamping；
2, all power supplys are opened；
3, the model rotor for being wound with first coil and the second coil thereon is sent into the inner hole of stator center using cylinder
In；
4, PLC controls signal, is powered to the first coil on model rotor；
5, PLC controls signal, measures the counter electromotive force in the second coil；
6, PLC controls the energization frequency and voltage of signal adjustment model rotor first coil, passes through the second coil of measurement
Counter electromotive force determines magnetic flux density (requiring the magnetic flux of measurement, such as 1.0 or 1.5T) of stator
7, PLC controls signal and gives power meter (i.e. measuring device), measures all power consumptions, the hair including first coil
The loss of iron loss and stator teeth in thermal losses, rotor core；Computer is by communication interface, by all test results
Import specific program.
8, the net power consumption of stator core is obtained by calculation in computer program；
9, computer passes through the associated stator size being manually entered, to calculate the weight of stator core；
10, net power consumption and stator core weight are divided by, to obtain core loss value.
11, by transmission line, 100% online detection of core loss value may be implemented.
In conclusion compared with prior art, the method and apparatus of measurement stator iron loss of the invention has following beneficial
Effect:
1, method of the invention can detect the iron loss of silicon steel sheet of stator core in motor volume manufacturing process at any time,
It is not influenced by technique and product, it might even be possible to apply a link on assembly line as detection, realize to stator core
Very detect.
2, method of the invention can obtain by adjusting the energization frequency of first coil and the induced voltage of the second coil
The core loss value of stator core under to any magnetic flux density and optional frequency, to adapt to different electric machine frequencies and design of electrical motor
When magnetic flux density setting.
Although the present invention has been described above with particularity, however, the present invention is not limited thereto, those skilled in the art can
It is modified with principle according to the present invention, therefore, the various modifications that all principles according to the invention carry out all should be understood as
Fall into protection scope of the present invention.
Claims (10)
1. a kind of method for measuring stator iron loss, comprising:
First coil is wound on model rotor, the second coil with first coil tight fit is wound on model rotor；
It will be wound in the model rotor merging stator of first coil and the second coil, make to keep uniform gas between stator and model rotor
Gap；
After model rotor is placed in stator, the power supply of changeable frequency is connected to via the current measurement part of measuring device
On one coil；
The voltage measuring section of measuring device is connected on second coil；
The output voltage of the power supply of changeable frequency is adjusted, until the sense for the second coil that the voltage measuring section of measuring device measures
Voltage is answered to reach standard value；
When the induced voltage of the second coil reaches standard value, the electric current of first coil is flowed through in the measurement of current measurement part；
The net power loss Pnet of stator core is calculated using measured electric current and voltage；
The core loss value Plosses of stator core is calculated using the net power loss Pnet of stator core calculated.
2. according to the method described in claim 1, the second coil with first coil tight fit be wound on model rotor including
Following steps:
After first coil is wound on model rotor, the second coil is wound on the first coil on model rotor around identical bits
Set place.
3. according to the method described in claim 2, the output voltage of the power supply of changeable frequency is adjusted, until the voltage of measuring device
The induced voltage of second coil of measurement part measurement reaches standard value and includes the following steps:
The alternating current for passing to frequency f to the first coil using power supply, forms alternating flux, inside model rotor so as to magnetic
Air gap, the teeth portion of stator and yoke portion are crossed all and forms closed circuit, and the second coil is made to obtain induced voltage；
Power supply is adjusted to the output voltage of first coil, so that the induced voltage of the second coil is reached preset standard value, so as to this
When stator core magnetic flux density reach preset flux density value.
4. according to the method described in claim 3, the net power loss Pnet using stator core calculated calculates stator iron
The core loss value Plosses of core also needs the net weight Wnet for calculating the stator core.
5. according to the method described in claim 4, the net power loss Pnet using stator core calculated calculates stator
Core loss value Plosses, using following formula:
Plosses=Pnet/Wnet (W/kg).
6. according to the method described in claim 5, the net power loss Pnet is calculated using following formula:
Pnet=P-Pvolt-Pcore (W)
Wherein: P=power meter reading P ' × 2.5 × 0.2 (W), power meter reading P ' are the performance number obtained by measuring device；
Pvolt is voltmeter loss, and Pvolt=(Vf × Vf)/5000 (W), Vf is feedback voltage；
Pcore is system loss (W).
7. according to the method described in claim 6, the net weight of the stator core is calculated using following formula:
Wnet=(W-Wteeth-Wflim)/1000 (kg)
Wherein: W is stator weight (g)；
Wteeth is parts of tooth weight, Wteeth=4.75 × h (g)；
Wfilm is insulation film weight (g).
8. according to the method described in claim 3, obtaining institute by Magnetic Circuit Method and the preset flux density value of the stator core
State the preset standard value of the second coil-induced voltage.
9. method according to claim 1-8, the stator is the stator of non-coiling.
10. a kind of equipment for any one of such as claim 1-9 the method, comprising:
Model rotor and stator to be measured；
The power supply of changeable frequency；
First coil for being wound on model rotor；
For with first coil tight fit and the second coil for being wound on model rotor；
The power supply of measuring device, including current measurement part and voltage measuring section, changeable frequency connects via current measurement part
Onto first coil, voltage measuring section connects the second coil；
Wherein, described to be wound with first coil and the model rotor of the second coil is placed in stator, and protected between stator and model rotor
Hold even air gap；
Wherein, the output voltage of the power supply of changeable frequency is adjusted, until the second coil of voltage measuring section measurement
Induced voltage reach standard value, and when the induced voltage of the second coil reaches standard value, pass through the current measurement part
The electric current of first coil is flowed through in measurement；
Wherein, the net power loss Pnet of stator core is calculated using measured electric current and voltage, and utilization is calculated fixed
The net power loss Pnet of sub- iron core calculates the core loss value of stator core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811066481.0A CN109212414A (en) | 2018-09-13 | 2018-09-13 | Measure the method and apparatus of stator iron loss |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066481.0A CN109212414A (en) | 2018-09-13 | 2018-09-13 | Measure the method and apparatus of stator iron loss |
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Family
ID=64983381
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596208A (en) * | 2020-04-23 | 2020-08-28 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Permanent magnet motor loss online testing device and method |
| CN111596208B (en) * | 2020-04-23 | 2022-05-31 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Permanent magnet motor loss online testing device and method |
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