CN109995193B - Method for reducing interference of motor leakage flux on magnetic encoder and motor assembly - Google Patents
Method for reducing interference of motor leakage flux on magnetic encoder and motor assembly Download PDFInfo
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- CN109995193B CN109995193B CN201711498354.3A CN201711498354A CN109995193B CN 109995193 B CN109995193 B CN 109995193B CN 201711498354 A CN201711498354 A CN 201711498354A CN 109995193 B CN109995193 B CN 109995193B
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- 238000010586 diagram Methods 0.000 description 6
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
- H02K11/21—Devices for sensing speed or position, or actuated thereby
- H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
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Abstract
The application discloses a method for reducing interference of motor leakage flux to a magnetic encoder and a motor assembly. The method for reducing the interference of motor leakage flux to the magnetic encoder comprises the following steps: detecting the distribution condition of motor leakage flux and finding out a first position with relatively small motor leakage flux; the first position of the motor is mounted adjacent to the magnetic encoder. Through the mode, the magnetic interference of the magnetic field generated by the leakage flux of the motor to the magnetic encoder can be reduced.
Description
Technical Field
The application relates to the field of motor rotating speed detection, in particular to a method for reducing interference of motor leakage to a magnetic encoder and a motor assembly.
Background
The magnetic encoder is usually used for detecting and feeding back information such as the position, the speed and the like of a motor rotor or a steering engine output shaft, adopts a magnetoelectric design, and detects the absolute position of the motor rotor by utilizing the change of a magnetic field through a magnetic induction device.
However, magnetic encoders are susceptible to magnetic field interference, and motor leakage flux is a large source of magnetic field interference. If no effective measures are taken to reduce the influence of the leakage flux of the motor, the precision and the performance of the magnetic encoder are greatly reduced and even fail.
Disclosure of Invention
The technical problem that this application mainly solved provides a method and motor element for reducing motor leakage to magnetic encoder interference, can reduce the magnetic interference of the magnetic field that motor leakage produced to magnetic encoder.
In order to solve the technical problem, the application adopts a technical scheme that: a method for reducing interference of motor leakage flux on a magnetic encoder is provided. The method for reducing the interference of motor leakage flux to the magnetic encoder comprises the following steps: detecting the distribution condition of motor leakage flux and finding out a first position with relatively small motor leakage flux; the first position of the motor is mounted adjacent to the magnetic encoder.
In order to solve the above technical problem, another technical solution adopted by the present application is: a method for reducing interference of motor leakage flux on a magnetic encoder is provided. The method for reducing the interference of motor leakage flux to the magnetic encoder comprises the following steps: fixing the magnetic encoder on the fixed seat; electrically connecting the magnetic encoder with a magnetic encoding reading instrument, and recording a first reading displayed on the magnetic encoding reading instrument; installing a motor on the fixed seat, rotationally adjusting the installation direction of the motor, and recording a plurality of second readings displayed on the magnetic encoding reading instrument; subtracting the first reading from the plurality of second readings to obtain a plurality of first differences, and selecting the minimum value of the plurality of first differences; and rotationally adjusting the motor to enable the distance between the position corresponding to the minimum value and the magnetic encoder to be shortest.
In order to solve the above technical problem, the present application adopts another technical solution: an electric machine assembly is provided. This motor element includes motor and magnetic encoder, and the magnetic leakage distributes unevenly on the motor, and the magnetic encoder distributes relatively less position relatively fixed with the magnetic leakage on the motor.
The beneficial effect of this application is: different from the prior art, the method and the motor assembly for reducing the interference of motor leakage flux on the magnetic encoder are provided. The method for reducing the interference of motor leakage flux to the magnetic encoder comprises the following steps: detecting the distribution condition of motor leakage flux and finding out a first position with relatively small motor leakage flux; the first position of the motor is mounted adjacent to the magnetic encoder. In this way, this application is close to magnetic encoder with the installation of the relatively less first position of magnetic leakage on the motor, has greatly reduced the magnetic field that the motor magnetic leakage produced to magnetic encoder's magnetic interference, has guaranteed magnetic encoder's accuracy effectively.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a method for reducing interference of motor leakage flux with a magnetic encoder provided herein;
FIG. 2 is a schematic flow chart diagram illustrating another embodiment of a method for reducing interference of motor leakage flux with a magnetic encoder provided herein;
FIG. 3 is a schematic flow chart diagram illustrating a method for reducing interference of motor leakage flux with a magnetic encoder according to yet another embodiment of the present disclosure;
FIG. 4 is a schematic flow chart diagram illustrating a method for reducing interference of motor leakage flux on a magnetic encoder according to still another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an embodiment of a motor assembly provided herein.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first", "second" and "third" in the embodiments of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, a flowchart of an embodiment of a method for reducing interference of motor leakage flux on a magnetic encoder is provided.
S11: and detecting the distribution condition of the motor leakage flux and finding out a first position with relatively small motor leakage flux.
And detecting the distribution condition of the motor leakage flux and finding out a first position with relatively small motor leakage flux. Specifically, a plurality of magnetic field strengths of the whole body of the motor shell are detected by a gaussmeter, the plurality of magnetic field strengths and corresponding positions of the magnetic field strengths are recorded, the plurality of magnetic field strengths are compared, the minimum magnetic field strength is selected, and then a first position corresponding to the minimum magnetic field strength is found.
More specifically, a plurality of detection positions are uniformly arranged around the motor shell, the magnetic field strengths of the detection positions are detected by a gaussmeter, and then the magnetic field strengths of the detection positions are recorded, so that the minimum value of the magnetic field strengths is obtained. In view of the fact that the detected positions of the motor are relatively random, the local minimum value obtained by comparing the magnetic field strengths of the detected positions is not necessarily the minimum value of the magnetic field strength of the whole motor shell, and an error inevitably exists, so that the position can be used as a first position with relatively small motor leakage flux for further adjustment according to the first position.
Optionally, 12 detection positions are uniformly arranged along the whole circumference of the motor housing, or 18, 24, 36 and other detection positions are arranged, which is not limited in the present application.
S12: the first position of the motor is mounted adjacent to the magnetic encoder.
Installing a first position of the motor close to the magnetic encoder, and regarding the position relation between the magnetic encoder and the first position, firstly fixing the magnetic encoder, and adjusting the position of the motor to ensure that the distance between the first position and the magnetic encoder is minimum; or fixing the motor, and after determining the first position, arranging the magnetic encoder at the position closest to the first position.
Inevitably, the motor will leak magnetic, which in turn affects the accuracy of the magnetic encoder. The first position with relatively small leakage flux of the motor is detected due to the fact that the magnetic field generated by the permanent magnet inside the motor on the shell is not distributed uniformly, the first position is close to the magnetic encoder during installation, the interference of the magnetic field of the motor on the magnetic encoder can be effectively reduced, and therefore the accuracy of the magnetic encoder is guaranteed to the maximum extent.
Referring to fig. 2, a flow chart of another embodiment of a method for reducing interference of motor leakage flux on a magnetic encoder is provided.
S21: and detecting the distribution condition of the motor leakage flux and finding out a first position with relatively small motor leakage flux.
Evenly set up a plurality of detection positions around motor housing, detect the magnetic field intensity of a plurality of detection positions with the gaussmeter, the magnetic field intensity of a plurality of detection positions of rerecording, and then obtain the minimum among a plurality of magnetic field intensities, the detection position that this minimum corresponds is the first position that motor magnetic leakage is less relatively.
S22: a first location is identified on the motor housing.
To facilitate subsequent adjustment of the mounting orientation of the motor based on the first position, the first position is marked on the motor housing.
S23: the mounting orientation of the motor is adjusted to minimize the distance from the first position to the magnetic encoder.
The mounting orientation of the motor is adjusted to minimize the distance from the first position to the magnetic encoder. The motor and the magnetic encoder are both installed on the fixing seat, wherein the motor is cylindrical, the motor is installed and fixed in a motor installation groove in the fixing seat, and the installation position of the magnetic encoder is located on the cylindrical side face of the motor. The detected magnetic leakage distribution condition of the whole body of the motor is the magnetic leakage distribution condition of the whole periphery of the side surface of the motor, and the first position is positioned on the side surface of the electrode, so that the installation direction of the motor can be adjusted to ensure that the distance from the first position to the magnetic encoder is shortest.
The first position on the motor with relatively small leakage flux faces the magnetic encoder, and the interference of the magnetic field generated by the motor due to the leakage flux on the magnetic encoder is also greatly reduced.
Referring to fig. 3, a schematic flow chart of another embodiment of a method for reducing interference of motor leakage flux on a magnetic encoder is provided.
S301: the magnetic encoder is fixed on the fixed seat.
The magnetic encoder is fixed on the fixed seat. The magnetic encoder is provided with a plurality of magnetosensitive elements along the circumference evenly, and the installation position of adjustment magnetic encoder is very limited to magnetic encoder's precision influence, and the installation position of motor is different, has the regional just to magnetic encoder of different magnetic leakage, and is more or less to magnetic encoder's precision influence. In this embodiment, the magnetic encoder is fixed first, and then the installation position of the motor is adjusted.
S302: a first reading of the magnetic encoder is detected and recorded.
The magnetic encoder is coupled to a magnetic encoder reader, and a first reading of the magnetic encoder is detected and recorded prior to the motor being installed, the first reading being measured without any magnetic interference from the magnetic encoder.
S303: and detecting the distribution condition of the motor leakage flux and finding out a first position with relatively small motor leakage flux.
Evenly set up a plurality of detection positions around motor housing, detect the magnetic field intensity of a plurality of detection positions with the gaussmeter, the magnetic field intensity of a plurality of detection positions of rerecording, and then obtain the minimum among a plurality of magnetic field intensities, the detection position that this minimum corresponds is the first position that motor magnetic leakage is less relatively.
S304: a first location is identified on the motor housing.
To facilitate subsequent adjustment of the mounting orientation of the motor based on the first position, the first position is marked on the motor housing.
S305: the mounting orientation of the motor is adjusted to minimize the distance from the first position to the magnetic encoder.
S306: a second reading of the magnetic encoder is detected and recorded.
After step S305, a second reading of the magnetic encoder is again detected and recorded, the second reading being measured with the first position on the motor being at the shortest distance from the magnetic encoder.
S307: and subtracting the first reading from the second reading to obtain a first difference value, and verifying whether the first difference value is within a preset threshold range.
And subtracting the first reading from the second reading to obtain a first difference value, and verifying whether the first difference value is within a preset threshold range. If so, the magnetic interference of the motor to the magnetic encoder is within an acceptable range, the motor is fixed in the motor mounting groove in the current mounting position of the motor, and the process is ended. If not, go to step S308.
Specifically, the preset threshold range is plus or minus 0.5 degrees.
S308: and detecting the distribution condition of the leakage flux of the motor again on the motor shell within 30 degrees of the left and right of the first position, and finding out a second position where the leakage flux of the motor is relatively small near the first position.
When the first difference exceeds the preset threshold range, it can be considered that a region with less leakage flux exists near the first position. And detecting the distribution condition of the leakage flux of the motor again on the motor shell within 30 degrees of the left and right of the first position, and finding out a second position where the leakage flux of the motor is relatively small near the first position. That is, a plurality of detection positions are uniformly provided in a range of 30 degrees to the left and right of the first position on the electrode case, the magnetic field strengths of the detection positions are detected again, the magnitudes of the magnetic field strengths are compared to obtain the minimum value, and the detection position corresponding to the minimum value is regarded as the second position.
Alternatively, in view of the fact that the magnetic field strength at the detection positions on both sides of the first position is greater than the magnetic field strength at the first position on the first detection motor housing, a plurality of detection positions may be provided on the region between the two detection positions to obtain the second position.
S309: the mounting orientation of the motor is adjusted to minimize the distance from the second position to the magnetic encoder.
The mounting orientation of the motor is again adjusted to minimize the distance from the second position to the magnetic encoder. If the detected second position coincides with the first position, it is described that the interval between the plurality of detected positions set for the second time is too large, and the interval between the plurality of detected positions needs to be reduced.
S310: a third reading of the magnetic encoder is detected and recorded.
Similarly, a third reading of the magnetic encoder is again detected and recorded for comparison with the first reading.
S311: and subtracting the first reading from the third reading to obtain a second difference value, and verifying whether the second difference value is within a preset threshold range.
And subtracting the first reading from the third reading to obtain a second difference value, and verifying whether the second difference value is within a preset threshold range. If yes, the flow is ended. If not, the second difference is still outside the plus or minus 0.5 degrees, the motor is replaced, and step S303 is executed again.
Optionally, if not, a review is needed here, and whether the interval of the detection positions of the motor is reasonable is detected for the first time, and after the interval is reduced, the detection positions are increased, and step S303 is executed again.
Referring to fig. 4, a schematic flowchart of another embodiment of a method for reducing interference of motor leakage flux on a magnetic encoder according to the present application is shown.
S41: the magnetic encoder is fixed on the fixed seat.
S42: the magnetic encoder is electrically connected to the magnetic encoding reader and records a first reading displayed on the magnetic encoding reader.
S43: and the motor is arranged on the fixed seat, the installation position of the motor is rotationally adjusted, and a plurality of second readings displayed on the magnetic coding reading instrument are recorded.
Uniformly marking a plurality of detection positions on the fixed seat, installing the motor on the fixed seat, and rotationally adjusting the installation position of the motor to ensure that the distance between the plurality of detection positions and the magnetic encoder is the shortest in sequence, recording the second reading of the magnetic encoder at the moment, and obtaining a plurality of second readings corresponding to the plurality of detection positions.
S44: subtracting the first reading from the plurality of second readings to obtain a plurality of first differences, and selecting the minimum value of the plurality of first differences.
S45: and judging whether the minimum value is within a preset threshold range.
Judging whether the minimum value is within a preset threshold range, if so, executing step S46; if not, the motor is replaced, and step S42 is executed.
Alternatively, if not, the interval of the detection positions is decreased, that is, the detection positions are increased, and step S42 is executed again.
S46: the adjustment motor is rotated so that the distance between the position corresponding to the minimum value and the magnetic encoder becomes the shortest.
Referring to fig. 5, a schematic structural diagram of an embodiment of a motor assembly provided in the present application is shown.
The motor assembly 50 includes a motor 51 and a magnetic encoder 52. The leakage distribution of the motor 51 is not uniform, and the magnetic encoder 52 is fixed relative to the position on the motor where the leakage distribution is relatively small. That is, the distance from the position on the motor 51 where the leakage flux distribution is relatively small to the magnetic encoder 52 is the shortest, so that the magnetic interference of the magnetic field generated by the leakage flux of the motor to the magnetic encoder is within the allowable range, and further, the accuracy of the magnetic encoder 52 is within the allowable range.
The beneficial effect of this application is: different from the prior art, the method and the motor assembly for reducing the interference of motor leakage flux on the magnetic encoder are provided. The method for reducing the interference of motor leakage flux to the magnetic encoder comprises the following steps: detecting the distribution condition of motor leakage flux and finding out a first position with relatively small motor leakage flux; the first position of the motor is mounted adjacent to the magnetic encoder. In this way, this application is close to magnetic encoder with the installation of the relatively less first position of magnetic leakage on the motor, has greatly reduced the magnetic field that the motor magnetic leakage produced to magnetic encoder's magnetic interference, has guaranteed magnetic encoder's accuracy effectively.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are intended to be included within the scope of the present application.
Claims (8)
1. A method for reducing the interference of motor leakage flux to a magnetic encoder is characterized in that,
fixing the magnetic encoder on the fixed seat;
detecting and recording a first reading of the magnetic encoder;
detecting the distribution condition of motor magnetic leakage, and finding out a first position with relatively small motor magnetic leakage;
identifying the first location on the motor housing;
adjusting the mounting orientation of the motor to minimize the distance from the first position to the magnetic encoder;
detecting and recording a second reading of the magnetic encoder;
subtracting the first reading from the second reading to obtain a first difference value, and verifying whether the first difference value is within a preset threshold range;
if yes, confirm that magnetic encoder's position sets up suitably, if no, in near first position detect again the distribution condition of motor magnetic leakage finds out the motor is in near first position magnetic leakage relatively less second position, and will the second position installation of motor is close to magnetic encoder.
2. The method of claim 1, wherein if not, detecting the distribution of the leakage flux of the motor again near the first position, and finding a second position of the motor with relatively small leakage flux near the first position, where the second position of the motor is installed near a magnetic encoder, comprises:
detecting the distribution condition of the leakage flux of the motor again on the motor shell within 30 degrees of the first position and the second position, and finding out the second position, close to the first position, of the motor, where the leakage flux is relatively small;
adjusting the mounting orientation of the motor to minimize the distance of the second position to the magnetic encoder.
3. The method of claim 2, wherein the step of adjusting the mounting orientation of the motor to minimize the distance from the second position to the magnetic encoder further comprises:
detecting and recording a third reading of the magnetic encoder;
subtracting the first reading from the third reading to obtain a second difference value, and verifying whether the second difference value is within the preset threshold range;
if so, determining the second position as the position having the least influence on the reading of the encoder;
and if not, replacing the motor, re-executing the distribution condition of the detected motor magnetic leakage, and finding out a first position with relatively small motor magnetic leakage.
4. The method of claim 1, wherein the detecting a distribution of leakage flux of the motor and finding a first position where the leakage flux of the motor is relatively small comprises:
detecting a plurality of magnetic field strengths around a housing of the motor with a gauss meter;
recording the plurality of magnetic field strengths and corresponding positions thereof;
and comparing the plurality of magnetic field strengths to select the smallest magnetic field strength, and further finding the first position corresponding to the smallest magnetic field strength.
5. The method of claim 4, wherein the detecting a plurality of magnetic field strengths around the motor housing with a gauss meter comprises:
evenly set up a plurality of detection positions around motor housing, it is a plurality of to detect the magnetic field intensity in detection position.
6. A method for reducing the interference of motor leakage flux to a magnetic encoder is characterized in that,
fixing the magnetic encoder on the fixed seat;
electrically connecting the magnetic encoder with a magnetic encoding reading instrument, and recording a first reading displayed on the magnetic encoding reading instrument;
installing a motor on the fixed seat, rotationally adjusting the installation direction of the motor, and recording a plurality of second readings displayed on the magnetic encoding reading instrument;
subtracting the first reading from the plurality of second readings to obtain a plurality of first differences, and selecting the minimum value of the plurality of first differences;
and rotationally adjusting the motor to enable the distance between the position corresponding to the minimum value and the magnetic encoder to be shortest.
7. The method of claim 6, wherein subtracting the first reading from the plurality of second readings to obtain a plurality of first differences, and wherein selecting the minimum value of the plurality of first differences further comprises:
judging whether the minimum value is within a preset threshold range;
if so, executing the rotation to adjust the motor so as to enable the distance between the position corresponding to the minimum value and the magnetic encoder to be shortest;
and if not, replacing the motor, executing the step of electrically connecting the magnetic encoder with the magnetic encoding reading instrument, and recording a first reading displayed on the magnetic encoding reading instrument.
8. An electric machine assembly, comprising:
a motor having an uneven magnetic flux leakage distribution;
a magnetic encoder adapted by a method according to any of claims 1 to 5 or 6 to 7 such that the magnetic encoder is fixed relative to a location on the motor where the leakage flux distribution is relatively small.
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| CN201711498354.3A CN109995193B (en) | 2017-12-29 | 2017-12-29 | Method for reducing interference of motor leakage flux on magnetic encoder and motor assembly |
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| JP4943191B2 (en) * | 2007-03-14 | 2012-05-30 | ペンタックスリコーイメージング株式会社 | Camera shake correction device |
| JP4457156B2 (en) * | 2008-03-31 | 2010-04-28 | 山洋電気株式会社 | Motor with electromagnetic brake |
| KR101922094B1 (en) * | 2012-11-08 | 2018-11-26 | 엘지이노텍 주식회사 | Moter |
| JP6057036B2 (en) * | 2014-10-10 | 2017-01-11 | 株式会社安川電機 | Motor and encoder for motor |
| CN104868812B (en) * | 2015-04-28 | 2018-01-16 | 中国科学院国家天文台南京天文光学技术研究所 | Large-scale spliced arc electric motor rotor exact position detecting system and its detection method |
| CN106645387B (en) * | 2017-01-19 | 2020-01-10 | 北京工业大学 | Pulse magnetoelastic and magnetic leakage integrated detection system for detecting cable force and damage of stayed cable |
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