CN118091505A - Online detection method and system for magnetic flux of rotor magnetic shoe of permanent magnet motor - Google Patents
Online detection method and system for magnetic flux of rotor magnetic shoe of permanent magnet motor Download PDFInfo
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- CN118091505A CN118091505A CN202410104387.9A CN202410104387A CN118091505A CN 118091505 A CN118091505 A CN 118091505A CN 202410104387 A CN202410104387 A CN 202410104387A CN 118091505 A CN118091505 A CN 118091505A
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- 230000004907 flux Effects 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 claims description 14
- 238000004590 computer program Methods 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 238000004804 winding Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
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Abstract
The invention discloses a permanent magnet motor rotor magnetic shoe magnetic flux on-line detection method, which comprises the following steps: the induced voltage of each permanent magnet is obtained through a data acquisition card, and integrated to obtain the effective value of the induced voltage of each permanent magnet; calculating the average value of the induced voltage of the permanent magnet according to the effective value of the induced voltage; and calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the induced voltage average value according to the induced voltage average value, thereby realizing the full detection test of the magnetic flux of the permanent magnet motor rotor. The invention also discloses an online detection system for the magnetic flux of the rotor magnetic shoe of the permanent magnet motor. The invention solves the technical problem of how to accurately and quickly perform online full-detection test on the magnetic flux of the rotor magnetic shoe of the permanent magnet motor.
Description
Technical Field
The invention relates to the technical field of permanent magnet motors, in particular to a method and a system for detecting magnetic flux of a rotor magnetic shoe of a permanent magnet motor on line.
Background
The magnetic flux test is one of the common modes of controlling the performance of the permanent magnetic ferrite tile, and is generally carried out by adopting a special profiling tool and a fluxgraph, so that the method is suitable for batch spot inspection and is difficult to realize full inspection test. The magnetic flux of the working face of the rotor magnetic shoe is directly reflected to the counter electromotive force of the motor, and for a three-phase symmetrical winding motor, the winding between two phases of the winding corresponds to 2/3 circumference rotor permanent magnets, and the counter electromotive force between the lines of the rotor is detected to be the average value of the effective value of the induced voltage of the rotor in a period of time, so that the counter electromotive force test of the rotor can only measure the average magnetic performance of the rotor, and the difference of the magnetic performance or the local magnetic performance corresponding to a certain piece of permanent magnet cannot be effectively evaluated. The magnetic flux detection on the surface of the rotor permanent magnet mainly detects the magnetic field performance of a certain circumference on the surface of the rotor permanent magnet through the Hall sensor, cannot detect the performance of the whole rotor permanent magnet area, has certain locality, cannot reflect the whole situation, and is complex in operation and not suitable for large-scale rapid online detection because the Hall sensor needs to be penetrated into the surface of the permanent magnet to be detected during the magnetic flux detection on the surface of the rotor permanent magnet. The patent document of 201710671998.1, for example, discloses a magnetic flux detection apparatus and a magnetic flux detection method, which also fail to solve the above-mentioned problems. Therefore, it is needed to provide a method and a system for online detection of magnetic flux of a rotor magnetic shoe of a permanent magnet motor, which solve the technical problem of how to accurately and rapidly perform online full-detection test on the magnetic flux of the rotor magnetic shoe of the permanent magnet motor.
Disclosure of Invention
The invention mainly aims to provide a method and a system for online detection of magnetic flux of a rotor magnetic shoe of a permanent magnet motor, which aim to solve the technical problem of how to accurately and rapidly carry out online full detection test on the magnetic flux of the rotor magnetic shoe of the permanent magnet motor.
In order to achieve the above purpose, the invention provides an online detection method for magnetic flux of a rotor magnetic shoe of a permanent magnet motor, wherein the online detection method for magnetic flux of the rotor magnetic shoe of the permanent magnet motor comprises the following steps:
S1, acquiring induced voltage of each permanent magnet through a data acquisition card, and integrating the induced voltage to obtain an effective induced voltage value of each permanent magnet;
s2, calculating an induced voltage average value of the permanent magnet according to the induced voltage effective value;
And S3, calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the induced voltage average value according to the induced voltage average value, so as to realize the full detection test of the magnetic flux of the permanent magnet motor rotor.
In one of the preferred schemes, the step S1 is to obtain the induced voltage of each permanent magnet through a data acquisition card, specifically: setting the sampling frequency and resolution of a data acquisition card, and obtaining the induced voltage of each permanent magnet.
In one preferred scheme, the sampling frequency of the data acquisition card is 1MHz.
In one preferred scheme, the resolution ratio of the data acquisition card is 16 bits.
In one of the preferred schemes, the effective value of the induced voltage is as follows:
wherein V rmsi is the effective value of the induced voltage of each permanent magnet, N is the number of turns of the coil, and t is the magnetic field change time.
In one of the preferred embodiments, the average value of the induced voltage is:
Wherein, And M is the number of poles of the rotor of the permanent magnet motor for the average value of the induced voltage.
In one preferred embodiment, the step S3 specifically includes:
s31, setting a standard threshold value, and taking the average value of the induced voltage as a reference voltage;
S32, calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the reference voltage according to the average value of the induced voltages.
In one preferred embodiment, after the step S32, the method further includes:
If the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the reference voltage is smaller than the standard threshold value, judging that the performance of the permanent magnet motor is qualified; otherwise, the test is judged as being disqualified.
According to one of the preferred schemes, the absolute value of the difference percentage of the induced voltage and the reference voltage corresponding to each permanent magnet of the permanent magnet motor rotor is as follows:
wherein DeltaV rms is the absolute value of the difference percentage of the induced voltage and the reference voltage corresponding to each permanent magnet of the permanent magnet motor rotor, Is the average value of the induced voltage.
The online detection system for the magnetic flux of the rotor magnetic shoe of the permanent magnet motor comprises a storage unit and a processing unit, wherein a computer program capable of running on the processing unit is stored in the storage unit; the processing unit realizes the on-line detection method for the magnetic flux of the rotor magnetic shoe of the permanent magnet motor when executing the computer program.
In the technical scheme, the online detection method for the magnetic flux of the rotor magnetic shoe of the permanent magnet motor comprises the following steps of: the induced voltage of each permanent magnet is obtained through a data acquisition card, and integrated to obtain the effective value of the induced voltage of each permanent magnet; calculating the average value of the induced voltage of the permanent magnet according to the effective value of the induced voltage; and calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the induced voltage average value according to the induced voltage average value, thereby realizing the full detection test of the magnetic flux of the permanent magnet motor rotor. The invention solves the technical problem of how to accurately and quickly perform online full-detection test on the magnetic flux of the rotor magnetic shoe of the permanent magnet motor.
According to the invention, the magnetic flux is estimated by measuring the induced voltage of the permanent magnet motor rotor, the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the induced voltage average value is calculated by obtaining the effective value of the induced voltage of each permanent magnet and the induced voltage average value of all the permanent magnets, so that the performance detection of the whole rotor permanent magnet area of the permanent magnet motor is effectively estimated, and the performance condition of the permanent magnet motor is reflected integrally.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings may be obtained from the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an online detection method for magnetic flux of a rotor magnetic shoe of a permanent magnet motor according to an embodiment of the invention;
fig. 2 is a waveform diagram of induced voltage of each permanent magnet obtained by the data acquisition card according to the embodiment of the present invention.
The achievement of the object, functional features and advantages of the present invention will be further described with reference to the drawings in connection with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as upper and lower … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the embodiments, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection claimed by the present invention.
Referring to fig. 1, according to an aspect of the present invention, the present invention provides an on-line detection method for magnetic flux of a rotor magnetic shoe of a permanent magnet motor, wherein the on-line detection method for magnetic flux of a rotor magnetic shoe of a permanent magnet motor includes the following steps:
S1, acquiring induced voltage of each permanent magnet through a data acquisition card, and integrating the induced voltage to obtain an effective induced voltage value of each permanent magnet;
s2, calculating an induced voltage average value of the permanent magnet according to the induced voltage effective value;
And S3, calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the induced voltage average value according to the induced voltage average value, so as to realize the full detection test of the magnetic flux of the permanent magnet motor rotor.
Specifically, in this embodiment, the step S1 obtains, through the data acquisition card, the induced voltage of each permanent magnet, specifically: setting the sampling frequency and resolution of a data acquisition card, and obtaining the induced voltage of each permanent magnet.
Specifically, in the present embodiment, the induced voltage is:
E＝4.44fKWNLΦ
wherein E is induced voltage, f is frequency, K W is winding coefficient, N L is number of turns of each phase of stator winding, and phi is magnetic flux; under the condition that the frequency, the winding coefficient and the winding turns are certain, the fluctuation of the induced voltage can effectively reflect the waveform of the air gap magnetic flux, and the air gap magnetic flux is estimated by measuring the winding induced voltage; the invention is not particularly limited, and the invention can be particularly set according to the requirement, so as to calculate the effective value of the induced voltage of each permanent magnet and evaluate the total magnetic flux of the air gap magnetic field corresponding to each permanent magnet.
Specifically, in this embodiment, referring to fig. 2, the abscissa indicates the number of poles of the rotor, for example, 36 peaks in a 36-pole rotor map, and the ordinate indicates the induced voltage corresponding to the permanent magnet, and the effective induced voltage value of each permanent magnet is obtained by integrating the induced voltage corresponding to each permanent magnet induced by the probe coil; according to the law of electromagnetic induction, a probing coil is arranged in a magnetic field B to be tested, the magnetic flux phi in the coil is changed through the relative motion of the coil and the magnetic field, the rotary vibration and the like, induced voltage is generated in the probing coil, N is set as the number of turns of the coil, S is the average sectional area of the coil, t is the magnetic field change time, and the effective value of the induced voltage is as follows:
wherein V rmsi is the effective value of the induced voltage of each permanent magnet, N is the number of turns of the coil, and t is the magnetic field change time.
Specifically, in this embodiment, the induced voltage average value is:
Wherein V rms is the average value of the induced voltage, M is the number of poles of the permanent magnet motor rotor, and the average value of the induced voltage is used as the reference voltage for judging whether the induced voltage of each permanent magnet is qualified or not.
Specifically, in this embodiment, the step S3 specifically includes:
s31, setting a standard threshold value, and taking the average value of the induced voltage as a reference voltage;
S32, calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the reference voltage according to the average value of the induced voltages; if the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the reference voltage is smaller than the standard threshold value, judging that the performance of the permanent magnet motor is qualified; otherwise, the test is judged as being disqualified.
Specifically, in this embodiment, the absolute value of the difference percentage between the induced voltage and the reference voltage corresponding to each permanent magnet of the permanent magnet motor rotor is:
wherein DeltaV rms is the absolute value of the difference percentage of the induced voltage and the reference voltage corresponding to each permanent magnet of the permanent magnet motor rotor, Is the average value of the induced voltage.
Specifically, in the embodiment, the magnetic flux is estimated by measuring the induced voltage of the permanent magnet motor rotor, the effective value of the induced voltage of each permanent magnet and the average value of the induced voltages of all the permanent magnets are obtained, and the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the average value of the induced voltages is calculated, so that the performance detection of the whole rotor permanent magnet area of the permanent magnet motor is effectively estimated, the performance condition of the permanent magnet motor is integrally reflected, the operation is simple, the practicability is higher, the application range is wider, and a determination method is provided for the online detection of the magnetic shoe magnetic flux of the permanent magnet motor rotor.
According to another aspect of the present invention, there is provided an on-line detection system for magnetic flux of a rotor of a permanent magnet motor, wherein the on-line detection system for magnetic flux of a rotor of a permanent magnet motor includes a storage unit and a processing unit, and a computer program executable on the processing unit is stored in the storage unit; the processing unit realizes the on-line detection method for the magnetic flux of the rotor magnetic shoe of the permanent magnet motor when executing the computer program.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather as utilizing equivalent structural changes made in the description of the present invention and the accompanying drawings or directly/indirectly applied to other related technical fields under the inventive concept of the present invention.
Claims (10)
1. The online detection method for the magnetic flux of the rotor magnetic shoe of the permanent magnet motor is characterized by comprising the following steps of:
S1, acquiring induced voltage of each permanent magnet through a data acquisition card, and integrating the induced voltage to obtain an effective induced voltage value of each permanent magnet;
s2, calculating an induced voltage average value of the permanent magnet according to the induced voltage effective value;
And S3, calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the induced voltage average value according to the induced voltage average value, so as to realize the full detection test of the magnetic flux of the permanent magnet motor rotor.
2. The method for detecting the magnetic flux of the rotor of the permanent magnet motor on line according to claim 1, wherein the step S1 is characterized in that the induced voltage of each permanent magnet is obtained through a data acquisition card, and specifically comprises the following steps:
setting the sampling frequency and resolution of a data acquisition card, and obtaining the induced voltage of each permanent magnet.
3. The method for detecting the magnetic flux of the rotor of the permanent magnet motor on line according to claim 2, wherein the sampling frequency of the data acquisition card is 1MHz.
4. The method for detecting the magnetic flux of the rotor of the permanent magnet motor on line according to claim 2, wherein the resolution of the data acquisition card is 16 bits.
5. The method for online detection of magnetic flux of rotor tiles of permanent magnet motor according to any one of claims 1 to 4, wherein the effective value of the induced voltage is:
wherein V rmsi is the effective value of the induced voltage of each permanent magnet, N is the number of turns of the coil, and t is the magnetic field change time.
6. The method for on-line detection of magnetic flux of a rotor of a permanent magnet motor according to claim 5, wherein the average value of the induced voltages is:
Wherein, And M is the number of poles of the rotor of the permanent magnet motor for the average value of the induced voltage.
7. The method for online detection of magnetic flux of rotor tiles of permanent magnet motor according to any one of claims 1 to 4, wherein the step S3 is specifically:
s31, setting a standard threshold value, and taking the average value of the induced voltage as a reference voltage;
S32, calculating the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the reference voltage according to the average value of the induced voltages.
8. The method for on-line detection of magnetic flux of rotor tiles of permanent magnet motor according to claim 7, further comprising, after step S32:
If the absolute value of the difference percentage of the induced voltage corresponding to each permanent magnet of the permanent magnet motor rotor and the reference voltage is smaller than the standard threshold value, judging that the performance of the permanent magnet motor is qualified; otherwise, the test is judged as being disqualified.
9. The method for on-line detection of magnetic flux of a rotor of a permanent magnet motor according to claim 7, wherein the absolute value of the difference percentage between the induced voltage and the reference voltage corresponding to each permanent magnet of the rotor of the permanent magnet motor is:
wherein DeltaV rms is the absolute value of the difference percentage of the induced voltage and the reference voltage corresponding to each permanent magnet of the permanent magnet motor rotor, Is the average value of the induced voltage.
10. The online detection system for the magnetic flux of the rotor magnetic shoe of the permanent magnet motor is characterized by comprising a storage unit and a processing unit, wherein a computer program capable of running on the processing unit is stored in the storage unit; the processing unit realizes the online detection method of the magnetic flux of the rotor magnetic shoe of the permanent magnet motor according to the claims 1-9 when executing the computer program.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410104387.9A CN118091505A (en) | 2024-01-25 | 2024-01-25 | Online detection method and system for magnetic flux of rotor magnetic shoe of permanent magnet motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410104387.9A CN118091505A (en) | 2024-01-25 | 2024-01-25 | Online detection method and system for magnetic flux of rotor magnetic shoe of permanent magnet motor |
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