CN109375101A - Measure the method and apparatus of stator core iron loss - Google Patents
Measure the method and apparatus of stator core iron loss Download PDFInfo
- Publication number
- CN109375101A CN109375101A CN201811066728.9A CN201811066728A CN109375101A CN 109375101 A CN109375101 A CN 109375101A CN 201811066728 A CN201811066728 A CN 201811066728A CN 109375101 A CN109375101 A CN 109375101A
- Authority
- CN
- China
- Prior art keywords
- coil
- stator core
- voltage
- loss
- measured
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
Abstract
The invention discloses a kind of methods for measuring stator core iron loss comprising: first coil is wound on stator core to be measured；The second coil with first coil tight fit is wound on stator core to be measured；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 core 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, fixed
The iron loss of son can only measure indirectly the iron loss of silicon steel sheet material by the method for detection silicon steel sheet batten, and referred to as batten detects
Method.
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 of finished product stator
It is horizontal.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, influences
Factor includes the uniformity of raw material iron loss, material stock thickness, punching press flatness and burr, lamination coefficient and stator lasmination；
Make in entire 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 a kind of side for measuring stator core iron loss
Method and equipment.
Above-mentioned purpose to realize the present invention, the present invention provide a kind of method for measuring stator core iron loss, comprising:
First coil is wound on stator core to be measured；
The second coil with first coil tight fit is wound on stator core to be measured；
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 second line that the voltage measuring section of measuring device measures
The induced voltage of circle 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 Pnet 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 Pnet of stator core calculated.
Wherein, the second coil with first coil tight fit is wound on stator core to be measured and is included the following steps:
After first coil is wound on stator core to be measured, the second coil is wound on the First Line on stator core to be measured
Circle around same position at.
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 being passed to frequency f to the first coil using power supply is formed inside stator core and surrounds stator iron
One week alternating magnetic field of core, so that the second coil obtains 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 E,
So that the magnetic flux density of stator core at this time reaches preset flux density value B.
Wherein, the core loss value that stator core is calculated using the net power loss Pnet of stator core calculated, also needs to count
Calculate the net weight Wnet of the stator core stator core.
Wherein, the core loss value of stator core is calculated using the net power loss Pnet of stator core calculated using such as
Lower formula:
Plosses=Pnet/Wnet (W/kg).
Preferably, 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 core is the stator core of non-coiling.
In addition, the present invention also provides a kind of equipment for measuring the method for stator core iron loss as described above, packet
It includes: stator core to be measured；The power supply of changeable frequency；First coil for being wound on stator core to be measured；For with First Line
Circle tight fit and the second coil being wound on stator core to be measured；Measuring device, including current measurement part and voltage measurement portion
Point, the power supply of changeable frequency is connected in first coil via current measurement part, and voltage measuring section connects the second coil；Its
In, the output voltage of the power supply of changeable frequency is adjusted, until the induction of the second coil of voltage measuring section measurement
Voltage reaches standard value, and when the induced voltage of the second coil reaches standard value, is measured and is flowed by the current measurement part
Cross the electric current of first coil；Wherein, the net power loss Pnet of stator core is calculated using measured electric current and voltage, and
The core loss value of stator core is calculated using the net power loss Pnet of stator core calculated.
Compared with prior art, the method and apparatus of measurement stator core iron loss of the invention has the following beneficial effects:
1, method of the invention can detect the silicon steel sheet iron of stator core in motor volume manufacturing process at any time
Damage, is not influenced by technique and product, it might even be possible to be applied a link on assembly line as detection, be realized to stator iron
The very detection of core.
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 motor is set
The setting of the magnetic flux density of timing.
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 is the schematic diagram that the embodiment of the present invention winds first coil, the second coil on stator core；
Fig. 3 is the schematic diagram of the equipment of the present embodiment measurement stator core iron loss of the present invention；
Fig. 4 is the present embodiment equipment structure chart of the present invention.
Specific embodiment
As shown in Figure 1, for a kind of flow chart for the method for measuring stator core iron loss provided by the invention, this method packet
Include following steps:
First coil is wound on stator core to be measured；
The second coil with first coil tight fit is wound on stator core to be measured；
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 the second coil；
The output voltage of the power supply of changeable frequency is adjusted, until the second line that the voltage measuring section of measuring device measures
The induced voltage of circle 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 Pnet 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 Pnet of stator core calculated.
Specifically, the method for the embodiment of the present invention includes the following steps:
S01, first coil and the second coil are wound on stator core to be measured
First coil is wound in a part of stator core to be measured, then, the second coil is wound on stator core to be measured
On first coil around same position at, so that the second coil is a tight fit in first coil the phase of stator core to be measured
With (as shown in Figure 2) at position, wherein the first coil being wound on stator core to be measured and the second coil are only around stator iron
A part of core circumference.
In wound around coil, the second coil can also be first wound in a part of stator core to be measured, then, by
One coil be wound on the second coil on stator core to be measured around same position at, so that the second coil and first coil are tight
Cooperation is at the same position of stator core to be measured.
It should be noted that the stator core of the embodiment of the present invention is the stator core of non-coiling.
S02, the power supply of first coil and changeable frequency is connected, and by the voltage measurement of the second coil and measuring device
Part connects
After winding first coil and the second coil on stator core to be measured, by the power supply of changeable frequency via measurement
The current measurement part of device is connected in first coil, when so as to for first coil indirect current, can make shape inside stator core
At the one week alternating magnetic field of stator core for surrounding stator core, and the second coil in alternating magnetic field can get induction
Voltage (i.e. counter electromotive force), so as to measure the induced voltage of the second coil by the voltage measuring section of measuring device, pass through
The electric current of first coil is flowed through in the measurement of current measurement part.
S03, adjust changeable frequency power supply output voltage, until the voltage measuring section of measuring device measure the
The induced voltage of two coil reaches standard value, and the electric current of first coil is flowed through using the measurement of current measurement part
S31, adjust changeable frequency power supply output voltage, make the induced voltage of the second coil reach standard value to include
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 stator core
Inside, which is formed, surrounds one week alternating magnetic field of stator core, just obtains the second coil and 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 measurement
Flow through 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
S41, stator core net power loss Pnet determination
After the induced voltage for measuring the electric current for flowing through first coil and the second coil, it can get power supply and export alternating current
Power P ' (power can be measured by measuring device such as power meter, can also by calculate gained), then, changed using formula 1
Power P after calculation:
P=power meter reading P ' × 2.5 × 0.2 (W) (formula 1)
After power P after being converted, it is calculated using power P, voltmeter loss Pvolt, system loss Pcore
The net power loss Pnet of stator core, net power loss Pnet do not include the heating loss of first coil, calculate net power
The formula that Pnet is lost 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.
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 core,
The net weight Wnet (g) of the stator core of stator core is calculated by following formula:
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 core tooth form part.
S43, the core loss value for calculating stator core
By calculating the net power loss Pnet of resulting stator core and the net weight of stator core, pass through following formula
Calculate the core loss value Plosses of stator core:
Plosses=Pnet/Wnet (W/kg) (formula 6)
It, can also be with it should be noted that the stator core of the non-coiling of the embodiment of the present invention, may include stator lasmination
Do not include stator lasmination, above-mentioned formula (4) be suitable for do not include the stator core core loss value of stator lasmination calculating, if stator
Iron core includes stator lasmination, need to subtract again the weight of stator lasmination on the basis of above-mentioned formula (4), then apply other formula
Calculate core loss value.
Wherein, current measurement part of the invention can use ammeter, and voltage measuring section can use voltmeter,
Measuring device also has power meter other than ammeter, voltmeter.
Using the above method of the embodiment of the present invention, can by power supply is led to first coil ac frequency and
The adjustment of output voltage obtains the core loss value of the stator core under any magnetic flux density and optional frequency, to adapt to different electricity
The setting of unit frequency, magnetic flux density.
The present invention also provides a kind of suitable for above-mentioned side other than providing the method for above-mentioned measurement stator core iron loss
The equipment of method, the equipment include: stator core 1 to be measured；The power supply of changeable frequency can use the power supply as shown in Fig. 3, packet
The frequency converter 5 for being used to adjust its output frequency for including AC transformer 6 and being connect with AC transformer 6；It is to be determined for being wound on
First coil 2 on sub- iron core 1；For with 2 tight fit of first coil and the second coil 3 for being wound on stator core 1 to be measured；
The power supply of measuring device 4, including current measurement part and voltage measuring section, changeable frequency is connected to via current measurement part
In first coil 2, voltage measuring section connects the second coil 3；Wherein, measuring device 4 can be using with current measurement part
With the power meter of voltage measuring section.
Wherein, the output voltage of the power supply of changeable frequency is adjusted, until the second coil 3 of voltage measuring section measurement
Induced voltage reaches standard value, and when the induced voltage of the second coil 3 reaches standard value, is measured by current measurement part
Flow through the electric current of first coil 2；Wherein, the net power loss of stator core 1 is calculated using measured electric current and voltage
Pnet, and utilize the core loss value of the net power loss Pnet of stator core 1 calculated calculating stator core 1.
It wherein, can be first in a part of stator core 1 around first coil in wound around coil on stator core 1 to be measured
2, then, the second coil 3 is wound on the first coil 2 on stator core to be measured around same position at；Alternatively, can also be with
First the second coil 3 is wound in a part of stator core 1, then, by first coil 2 be wound on the second coil 3 around it is identical
At position.To make the second coil 3 be a tight fit at the same position of stator core 1 to be measured with first coil 2, wherein be wound on
The a part of first coil and the second coil on stator core to be measured only around stator core circumference.
In conclusion compared with prior art, the method and apparatus of measurement stator core iron loss of the invention has as follows
The utility model has the advantages that
1, method of the invention can detect the silicon steel sheet iron of stator core in motor volume manufacturing process at any time
Damage, is not influenced by technique and product, it might even be possible to be applied a link on assembly line as detection, be realized to stator iron
The very detection of core.
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 motor is set
The setting of the magnetic flux density of timing.
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 core iron loss, comprising:
First coil is wound on stator core to be measured；
The second coil with first coil tight fit is wound on stator core to be measured；
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 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 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 is wound on stator core to be measured
Include the following steps:
After first coil is wound on stator core to be measured, by the second coil be wound on the first coil on stator core to be measured institute around
Same position at.
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 being passed to frequency f to the first coil using power supply is formed inside stator core and surrounds stator core one
The alternating magnetic field in week, so that the second coil obtains 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 E, so as to this
When stator core magnetic flux density reach preset flux density value B.
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 of core also needs the net weight Wnet for calculating the stator core stator core.
5. according to the method described in claim 4, the net power loss Pnet using stator core calculated calculates stator iron
The core loss value of core uses 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 core is the stator core of non-coiling.
10. a kind of equipment of the method for the described in any item measurement stator core iron loss of such as claim 1-9, comprising:
Stator core to be measured；
The power supply of changeable frequency；
First coil for being wound on stator core to be measured；
For with first coil tight fit and the second coil for being wound on stator core to be measured；
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, 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 |
|---|---|---|---|
| CN201811066728.9A CN109375101A (en) | 2018-09-13 | 2018-09-13 | Measure the method and apparatus of stator core iron loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066728.9A CN109375101A (en) | 2018-09-13 | 2018-09-13 | Measure the method and apparatus of stator core iron loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109375101A true CN109375101A (en) | 2019-02-22 |
Family
ID=65405583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811066728.9A Pending CN109375101A (en) | 2018-09-13 | 2018-09-13 | Measure the method and apparatus of stator core iron loss |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109375101A (en) |
Cited By (1)
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221221A (en) * | 2008-01-25 | 2008-07-16 | 四川东风电机厂有限公司 | Bulb through-flow type hydraulic turbogenerator stator iron loss testing method |
| CN101303394A (en) * | 2008-07-09 | 2008-11-12 | 天津市天发重型水电设备制造有限公司 | Device and method for testing hydroelectric generating set electricity generator stator core |
| CN201222093Y (en) * | 2008-07-09 | 2009-04-15 | 天津市天发重型水电设备制造有限公司 | Test device for hydraulic generator stator core |
| CN105388377A (en) * | 2015-11-09 | 2016-03-09 | 北京信息科技大学 | Detection apparatus of stator iron core aging of old motor |
| CN105866556A (en) * | 2016-06-15 | 2016-08-17 | 湖南省湘电试验研究院有限公司 | Large-sized generator stator core loss detection method and device |
-
2018
- 2018-09-13 CN CN201811066728.9A patent/CN109375101A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101221221A (en) * | 2008-01-25 | 2008-07-16 | 四川东风电机厂有限公司 | Bulb through-flow type hydraulic turbogenerator stator iron loss testing method |
| CN101303394A (en) * | 2008-07-09 | 2008-11-12 | 天津市天发重型水电设备制造有限公司 | Device and method for testing hydroelectric generating set electricity generator stator core |
| CN201222093Y (en) * | 2008-07-09 | 2009-04-15 | 天津市天发重型水电设备制造有限公司 | Test device for hydraulic generator stator core |
| CN105388377A (en) * | 2015-11-09 | 2016-03-09 | 北京信息科技大学 | Detection apparatus of stator iron core aging of old motor |
| CN105866556A (en) * | 2016-06-15 | 2016-08-17 | 湖南省湘电试验研究院有限公司 | Large-sized generator stator core loss detection method and device |
Cited By (2)
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201145737Y (en) | Apparatus for measuring error of current transformer based on parameter measurement | |
| CN104677927B (en) | Distribution transformer winding wood properly test system and method | |
| CN102608552A (en) | Acquiring method of DC (direct-current) bias magnet ratio total losses curve of transformer core material | |
| CN107703368B (en) | Method for measuring inductance of transformer in deep saturation state | |
| CN107015178A (en) | The measuring method of transformer core material hysteresis curve under harmonic excitation | |
| CN101303394B (en) | Device and method for testing hydroelectric generating set electricity generator stator core | |
| CN202600121U (en) | Device for obtaining hysteresis loop of dc biasing of transformer iron-core material | |
| CN108226826B (en) | Single-piece magnetic permeameter, single-piece sample measuring device and measuring method | |
| CN109031169A (en) | The adjustable pawl pole magnetic property non-destructive testing device of test temperature and method | |
| CN109375101A (en) | Measure the method and apparatus of stator core iron loss | |
| CN111273117B (en) | Method and device for shortening no-load temperature rise test time of dry-type transformer | |
| CN111220908B (en) | Stator core magnetization test method for avoiding 0-section resonance in flat wave compensation excitation | |
| CN106908745B (en) | A kind of test and calculation method of the ferromagnetic element excitation property based on low-frequency square-wave and no-load loss | |
| CN205941862U (en) | Perpendicular square magnetism measuring device that encloses | |
| CN110704962B (en) | Manufacturing method of double-power output energy-taking magnetic core | |
| CN105974349B (en) | A kind of measuring method of current transformer tracking accuracy | |
| CN109212414A (en) | Measure the method and apparatus of stator iron loss | |
| CN208399665U (en) | A kind of vertical three-phase flexibility wideband rotary magnetic characteristic measuring system | |
| CN201222093Y (en) | Test device for hydraulic generator stator core | |
| CN107807340B (en) | Silicon steel lamination core performance simulation test platform | |
| CN104614688A (en) | C-type sensor for DC magnetic bias dynamic magnetic-flux measurement and detection method thereof | |
| CN110231373B (en) | Detection method and detection device for transformer winding material | |
| CN114545307A (en) | Magnetic property measuring system for magnetic materials under multi-physical-field coupling environment | |
| CN204441079U (en) | A kind of novel measurement power taking Current Transformer | |
| Bompou et al. | Loss in steel armour wires for submarine power cables |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190222 |
|
| RJ01 | Rejection of invention patent application after publication |