CN113839488B - Magnet sample, magnetic pole detection sample and detection method for magnetic saturation of magnetic pole - Google Patents

Abstract

The invention relates to a magnet sample, a magnetic pole detection sample and a method for detecting magnetization saturation of a magnetic pole. The magnet sample is used to detect the magnetization saturation of a magnetic pole. The magnet sample is arranged with a plurality of permanent magnets to form a magnetic pole, and It has the same outer dimension as the permanent magnet, wherein the magnet sample includes a magnetizable test column. The present invention prepares a magnetic pole detection sample simulating a magnetic pole by arranging a magnet sample for simulating a permanent magnet of a magnetic pole, and assembling the magnet sample together with a plurality of permanent magnets to a position on a substrate where the magnetizing magnetic field is weak. Then, the magnetic pole detection sample is magnetized, and the magnetization saturation of the magnetized sample is detected, so that the magnetization saturation of the entire magnetic pole can be effectively evaluated.

Description

Magnet sample, magnetic pole detection sample and detection method for magnetic saturation of magnetic pole

technical field

The invention relates to the technical field of permanent magnet motors, in particular to a magnet sample, a magnetic pole detection sample and a detection method for magnetic saturation of magnetic poles.

Background technique

The rotor poles of the permanent magnet motor use permanent magnets as the excitation unit to provide an alternating magnetic field. In order to facilitate assembly and later maintenance, multiple columns of magnetic poles are distributed along the circumferential direction of the rotor, and each column of magnetic poles adopts a modular structure, that is, each column of magnetic poles includes a base plate extending along the axial direction of the rotor and multiple permanent magnets arranged on the base plate .

When actually assembling the magnetic poles, usually a plurality of unmagnetized permanent magnets are installed on the substrate first, and then the whole is magnetized. For high-power permanent magnet motors, due to the large length of the magnetic poles along the axial direction, the magnetic flux after the overall magnetization is not easy to be detected by a general magnetic flux detector, and the magnetization saturation of the entire magnetic poles cannot be evaluated.

Contents of the invention

The object of the present invention is to provide a magnet sample, a magnetic pole detection sample and a detection method for magnetic saturation of a magnetic pole. The detection method can effectively evaluate the magnetic saturation of the entire magnetic pole.

On the one hand, the present invention provides a magnet sample, which is used to detect the magnetization saturation of the magnetic pole, the magnet sample is arranged with a plurality of permanent magnets to form a magnetic pole, and has the same outer dimension as the permanent magnet, wherein the magnet sample Accessories include a magnetizable test column.

According to one aspect of the present invention, the magnet sample further includes a bearing part made of non-magnetic-conductive material, a test column is arranged in the bearing part, and the test column is made of magnetic-conductive material.

According to one aspect of the present invention, the carrier includes a first surface of the yoke close to the magnetic pole, and the test column is inserted into the carrier from the first surface of the carrier.

According to one aspect of the present invention, a blind hole formed by inward depression of the first surface is opened on the bearing member; a test post is embedded in the blind hole, and the end surface of the test post away from the bottom surface of the blind hole is flush with the first surface.

According to one aspect of the present invention, the test column is a cylindrical structure with a diameter of Φ10 mm and a length of 10 mm.

According to one aspect of the present invention, there are multiple test columns, and the plurality of test columns are arranged in an array on the carrier.

According to one aspect of the present invention, the test column is detachably connected to the carrier.

According to one aspect of the present invention, the test column is bonded in the blind hole of the carrier by resin or adhesive.

According to one aspect of the present invention, the material of the carrier has self-lubricating properties; or, the outer surface of the carrier and/or the inner surface of the blind hole and/or the outer surface of the test column are sprayed with a release agent; or, the carrier's A release cloth is provided on the outer surface and/or the inner surface of the blind hole and/or the outer surface of the test column.

On the other hand, the present invention also provides a magnetic pole detection sample, which is used to detect the magnetization saturation of the magnetic pole. The magnetic pole detection sample includes: a substrate; a plurality of unmagnetized permanent magnets, which are arranged on the substrate; and For the aforementioned magnet sample, the magnet sample and a plurality of permanent magnets are arranged in a row along the length direction of the substrate, wherein the magnet samples are at least located at both ends of the substrate in the length direction.

According to one aspect of the present invention, at least one magnet sample is respectively arranged at both ends of the substrate in the length direction.

According to an aspect of the present invention, the magnet sample is also located at any position between the plurality of permanent magnets on the substrate.

According to one aspect of the present invention, a plurality of permanent magnets and the magnet sample are bonded on the substrate by resin, and the magnet sample is released from the magnetic pole detection sample by wetting the resin.

On the other hand, the present invention also provides a detection method of magnetic pole magnetization saturation, comprising: providing the magnetic pole detection sample as mentioned above; magnetizing the magnetic pole detection sample; detecting the magnetization saturation of the magnet sample degrees to evaluate the magnetization saturation of the magnetic poles.

According to one aspect of the present invention, detecting the magnetization saturation of the magnet sample to evaluate the magnetization saturation of the magnetic pole includes: detecting the residual magnetic induction of the test column of the magnet sample after magnetization; The comparison result of the preset value determines the magnetization saturation of the magnetic pole.

According to one aspect of the present invention, detecting the residual magnetic induction of the test column of the magnet sample after magnetization includes: taking out the magnetized test column from the carrier; detecting the hysteresis loop of the test column; The line determines the residual magnetic induction of the test column.

According to one aspect of the present invention, the magnet sample includes a plurality of test columns arranged in an array on the carrier, and the detection method further includes: detecting the hysteresis loops of the test columns at different positions of the carrier; Determine the residual magnetic induction of the test column; compare the residual magnetic induction of the test column at different positions to evaluate the magnetic flux consistency of the corresponding positions of the magnetic poles in the circumferential and/or axial directions.

According to one aspect of the present invention, the magnet sample is located at any position between the two ends of the length direction of the substrate and the plurality of permanent magnets, and the detection method also includes: detecting the magnet samples at different positions of the magnetic pole detection sample after magnetization The residual magnetic induction of the test column of the magnet sample; the residual magnetic induction of the test column of the magnet sample in different positions is compared to evaluate the magnetic flux consistency of the magnetic pole magnetization in the circumferential and/or axial directions.

The invention provides a magnet sample, a magnetic pole detection sample, and a detection method for magnetic saturation of a magnetic pole, by setting a magnet sample for simulating a permanent magnet of a magnetic pole, and combining the magnet sample with a plurality of permanent magnets Assemble to the weaker position of the magnetizing magnetic field on the substrate to prepare a magnetic pole detection sample for simulating the magnetic pole, then magnetize the magnetic pole detection sample, and detect the magnetization saturation of the magnetized sample, so that it can Efficiently evaluate the magnetization saturation of the entire magnetic pole.

Description of drawings

The features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the figures, the same parts are given the same reference numerals. The figures are not drawn to scale.

Fig. 1 is a schematic structural diagram of a magnetic pole detection sample provided by an embodiment of the present invention;

Fig. 2 is a schematic structural view of a magnet sample in the magnetic pole detection sample shown in Fig. 1;

Fig. 3 is a partial cross-sectional structural schematic diagram of the magnet sample shown in Fig. 2;

Fig. 4 is a schematic structural diagram of another magnetic pole detection sample provided by an embodiment of the present invention;

Fig. 5 is a block flow diagram of a method for detecting magnetization saturation of a magnetic pole provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of the hysteresis loop of the test column in the detection method shown in FIG. 5 .

Explanation of reference signs:

1-magnet sample; 11-carrier; 11a-blind hole; 111-first surface; 112-second surface; 12-test column;

2-permanent magnet; 3-substrate; S-magnetic pole detection sample.

Detailed ways

Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present invention; and, for clarity, the dimensions of some structures may have been exaggerated. Furthermore, the features, structures, or characteristics described hereinafter may be combined in any suitable manner in one or more embodiments.

The orientation words appearing in the following description are all directions shown in the figure, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that unless otherwise specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrally connected; can be directly connected or indirectly connected. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

As the stand-alone power of permanent magnet direct drive wind turbines increases, the diameter of permanent magnet generators becomes larger and larger. Correspondingly, the overall size of the rotor poles is getting larger. For high-power permanent magnet motors, the rotor poles use permanent magnets as the excitation unit to provide an alternating magnetic field. Due to the large axial length of the rotor poles, the general magnetic flux detector is not suitable for detecting the magnetic flux after the magnetic poles are magnetized. In addition, the magnetization saturation of the rotor magnetic poles after magnetization cannot be detected, let alone the consistency of the magnetic flux at each position of the magnetic poles.

For this reason, a magnet sample, a magnetic pole detection sample, and a detection method for magnetic pole magnetization saturation provided by the embodiment of the present invention can be applied to the type inspection of the magnetic pole magnetization process of the motor rotor, for example, the mass production of permanent magnet motors Previous verification inspection, certification inspection of permanent magnet motor, etc.

In order to better understand the present invention, a magnet sample, a magnetic pole detection sample and a detection method for magnetic pole magnetization saturation provided by an embodiment of the present invention are described in detail below with reference to FIGS. 1 to 6 .

In the design stage of the magnetic poles of the motor rotor, it can be known from the electric field simulation that the magnetizing magnetic field strength is the strongest in the middle of the axial direction of the magnetic poles (that is, the length direction of the magnetic poles), and gradually increases towards the two ends of the axial direction of the magnetic poles. Attenuation, that is, the strength of the magnetizing magnetic field at both ends of the length direction of the magnetic pole is the weakest. Therefore, the middle part of the magnetic pole along the length direction is most likely to achieve magnetization saturation, while the two ends of the magnetic pole along the length direction are prone to magnetization undersaturation. Therefore, it is necessary to detect the magnetization conditions at both ends of the magnetic pole along the length direction after the magnetic pole is magnetized. Theoretically, as long as the magnetization at both ends along the length direction of the magnetic pole reaches saturation, the magnetization of the entire magnetic pole reaches saturation.

Please refer to Fig. 1, the embodiment of the present invention provides a magnetic pole detection sample S, which is used to simulate the magnetic poles of the motor rotor, and the magnetic saturation of the magnetic poles of the motor rotor can be evaluated by detecting the magnetization saturation of the magnetic pole detection sample S .

The magnetic pole detection sample S includes: a substrate 3 , a plurality of permanent magnets 2 arranged on the substrate 3 and a magnet sample 1 .

The magnet sample 1 is used to simulate the permanent magnet 2 of the magnetic pole of the motor rotor. The magnet sample 1 and a plurality of permanent magnets 2 are arranged in a row along the length direction of the substrate 3, wherein the magnet sample 1 is at least located in the length direction of the substrate 3 both ends.

Since the magnet sample 1 is located at the position where the magnetization magnetic field strength of the magnetic pole detection sample S is the weakest, the magnetization saturation of the magnetic pole detection sample S can be evaluated by detecting the magnetization saturation of the magnet sample 1, and then the motor can be determined. The magnetization saturation of the magnetic poles of the rotor.

The specific structure of a magnet sample 1 provided by the embodiment of the present invention will be further described in detail below with reference to the accompanying drawings.

Please refer to FIG. 2 and FIG. 3 together. The magnet sample 1 is used to detect the magnetization saturation of the magnetic pole. The magnet sample 1 is arranged with a plurality of permanent magnets 2 to form a magnetic pole, and has the same outer contour size as the permanent magnet 2. Wherein, the magnet sample 1 includes a magnetizable test column 12 .

Further, the magnet sample 1 further includes a carrier 11 made of a non-magnetic material, and a test column 12 is arranged in the carrier 11, and the test column 12 is made of a magnetic material.

In order to make the characteristics of the magnet sample 1 close to that of the permanent magnet 2 , the carrier 11 of the magnet sample 1 has the same outer dimension as the permanent magnet 2 , and the carrier 11 is made of a non-magnetic material for carrying the test column 12 . Optionally, the material of the bearing member 11 is plastic. In addition, the material of the permanent magnet 2 is generally ferromagnetic or ferrimagnetic, such as neodymium iron boron (Nd2Fe14B). NdFeB contains a large amount of rare earth elements neodymium, iron and boron, which are hard and brittle. The material of the test column 12 is the same as that of the permanent magnet 2, and may also be NdFeB.

Further, the carrier 11 includes a first surface 111 of the yoke close to the magnetic pole, and the test column 12 is inserted into the carrier 11 from the first surface 111 of the carrier 11 .

Specifically, the carrier 11 is provided with a blind hole 11a formed by the inward depression of the first surface 111; the test column 12 is embedded in the blind hole 11a, and the end surface of the test column 12 away from the bottom surface of the blind hole 11a is flush with the first surface 111 set up.

Optionally, the test column 12 is a cylindrical structure with a diameter of Φ10 mm and a length of 10 mm. The above-mentioned dimensions of the test column 12 are the dimensions of a standard test sample, so that the magnetic properties of the test column 12 can be evaluated according to the measurement method for the magnetic properties of magnetic materials stipulated in international general standards.

Optionally, there are multiple test columns 12 , and the multiple test columns 12 are arranged in an array on the carrier 11 . The more the number of test columns 12 is, the closer the magnetic field strength of the magnet sample 1 after magnetization is to the magnetic field characteristics of the permanent magnet 2 at the corresponding position of the magnetized pole. In addition, a plurality of test columns 12 are arranged in an array on the carrier 11, which can reflect the magnetization effect of the magnetized permanent magnet 2 at each position. By comparing the magnetization effects of each test column 12, it is possible to more accurately The magnetic flux consistency of each permanent magnet 2 magnetized in the circumferential and axial directions of the rotor after magnetization is analyzed.

In addition, in order to take out the test column 12 from the carrier 11 for detection after the magnet sample 1 is magnetized, the test column 12 is detachably arranged on the carrier 11 . Optionally, the test column 12 is bonded to the carrier 11 by resin or glue.

In the actual preparation process of the magnetic poles of the motor rotor, fiber cloth is usually laid on a plurality of permanent magnets 2, and the resin is introduced into the plurality of permanent magnets 2 through the fiber cloth by using a vacuum infusion molding process to form a combination of a plurality of permanent magnets 2 and The substrate 3 is bonded together with a resin coating, which can prevent water vapor and impurities in the external environment from invading the magnetic poles. Thus, the magnetic pole detection sample S that simulates the magnetic pole can also lay fiber cloth on the permanent magnet 2 and the magnet sample 1, and adopt the vacuum infusion molding process to introduce the resin through the fiber cloth into a plurality of permanent magnets 2 and the magnet sample 1, In order to form a resin coating that integrally bonds the plurality of permanent magnets 2 and the magnet sample 1 with the substrate 3, the fiber cloth can be removed after the resin coating is formed.

Optionally, during the process of preparing the magnetic pole detection sample S, the resin can penetrate between the blind hole 11a of the carrier 11 and the test column 12, so that the test column 12 is bonded to the blind hole 11a of the carrier 11 by resin . When the magnetic properties of the test column 12 need to be tested separately, the magnet sample 1 can be released from the substrate 3 by soaking the resin, and the test column 12 can be released from the carrier 11 at the same time.

In order to facilitate the demoulding of the test column 12 from the carrier 11 and the demoulding of the magnet sample 1 from the magnetic pole detection sample S, optionally, the material of the carrier 11 has self-lubricating properties, such as the carrier 11. The material is polytetrafluoroethylene. Polytetrafluoroethylene is the material with the lowest friction coefficient among known solid materials. It has high lubricating and non-stick properties, and can be used to make self-lubricating parts.

Optionally, the outer surface of the carrier 11 can be sprayed with a release agent, the inner surface of the blind hole 11a can be sprayed with a release agent, and the outer surface of the test column 12 can also be sprayed with a release agent.

Optionally, the outer surface of the carrier 11 can be provided with a release cloth, the inner surface of the blind hole 11a can be provided with a release cloth, and the outer surface of the test column 12 can also be provided with a release cloth, so that the test column 12 Release the mold from the carrier 11 , and release the magnet sample 1 from the magnetic pole detection sample S.

It can be understood that the test column 12 can also be bonded in the blind hole 11a of the carrier 11 by adhesive. When the magnetic properties of the test column 12 need to be tested separately, the test column 12 can be taken out after diluting the adhesive with a diluent.

As mentioned above, in order to evaluate the magnetization saturation of the magnetic pole detection sample S, the magnet sample 1 is arranged at the position where the magnetization magnetic field strength of the magnetic pole detection sample S is the weakest, that is, the magnet sample 1 is arranged on the base plate 3 Both ends of the length direction. In order to improve the detection accuracy of magnetization saturation, optionally, at least one magnet sample 1 is respectively arranged at both ends of the substrate 3 in the length direction.

The number of magnet samples 1 needs to be determined by comprehensive consideration of various factors. On the one hand, the more the number of magnet samples 1, the better the magnetization saturation of the magnetic pole detection sample S at each position can be detected; on the other hand, the magnetization The number of samples 1 should not be too much. For example, if the number of magnet samples 1 is more than the number of permanent magnets 2, the magnetization characteristics of the magnetic pole detection sample S will deviate from the actual magnetization characteristics of the rotor pole itself. The magnetization saturation of the magnetic pole detection sample S may not represent the magnetization saturation of the actual rotor pole. Therefore, the number of magnet samples 1 needs to be able to reflect the magnetization saturation of the magnetic pole detection sample S at the position where the magnetization is weak, and it cannot represent the magnetization characteristics of the actual rotor pole itself due to the large number. Depends on balance. As shown in FIG. 1 , two magnet samples 1 are arranged at both ends of the substrate 3 along the length direction of the magnetic pole detection sample S, and the number of permanent magnets 2 is 14.

A magnet sample 1 provided in an embodiment of the present invention is provided by arranging a magnet sample 1 for simulating a permanent magnet 2 of a magnetic pole, and assembling the magnet sample 1 and a plurality of permanent magnets 2 on a substrate 3. The position of the weak magnetic field is used to prepare the magnetic pole detection sample S for simulating the magnetic pole, and then the magnetic pole detection sample S is magnetized, and the magnetization saturation of the magnetized sample 1 after magnetization is detected, so that the entire Magnetic saturation of the poles.

Referring to FIG. 4, the embodiment of the present invention also provides another magnetic pole detection sample S, which is similar in structure to the magnetic pole detection sample S shown in FIG. Any position among the plurality of permanent magnets 2. For example, a magnet sample 1 is also provided in the middle of the substrate 3 .

Among the plurality of magnet samples 1 of the magnetic pole detection sample S, the magnetization saturation of the magnet samples 1 located at both ends of the length direction of the substrate 3 represents the magnetization saturation of the magnetization magnetic field weakest position of the magnetic pole, which is located on the substrate 3 The magnetization saturation of the magnet sample 1 in the middle represents the magnetization saturation of the strongest magnetization magnetic field position of the magnetic pole, and the magnetization saturation of the magnet sample 1 at other positions on the substrate 3 represents the magnetization of the corresponding position of the magnetic pole saturation. Comparing the collected magnetization saturation data of the magnetic pole detection sample S at various positions, the magnetization saturation of the magnetic poles in different positions in the axial direction of the rotor can be obtained, and then the magnetic flux of the magnetic poles in the axial direction of the rotor can be obtained consistency.

As mentioned above, if the magnet sample 1 includes a plurality of test columns 12 arranged in an array on the carrier 11, then through the magnet sample 1, it is possible to more accurately analyze the position of each permanent magnet 2 in the rotor after magnetization. The magnetic flux consistency in the circumferential and axial directions. Further, if each of the plurality of magnet samples 1 of the magnetic pole detection sample S includes a plurality of test columns 12 arranged in an array on the carrier 11, the magnet samples 1 at different positions By comparing the magnetization saturation data of the test column 12, the magnetic flux consistency of the entire magnetic pole in the circumferential and axial directions of the rotor can be evaluated, so that the magnetization effect of the entire magnetic pole can be evaluated more comprehensively and reliably.

In addition, in order to detect the magnetization states of different positions of the magnetic poles, the magnet sample 1 can be repeatedly arranged at different positions on the substrate 3 , thereby saving the manufacturing cost of the magnet sample 1 .

Referring to Fig. 5, the embodiment of the present invention also provides a detection method for magnetic saturation of magnetic poles, including:

Step S1: Provide any magnetic pole detection sample S as mentioned above.

As shown in Figures 1 to 3, the magnetic pole detection sample S includes a substrate 3 and a plurality of permanent magnets 2 and magnet samples 1 arranged in a row along the length direction of the substrate 3, wherein the magnet sample 1 is at least located on the substrate 3 both ends of the length direction. The magnet sample 1 has the same outer dimension as the permanent magnet 2, and it includes a carrier 11 and a test column 12 arranged on the carrier 11. The carrier 11 is made of a non-magnetic material, and the test column 12 is made of a permanent magnet. 2 Made of magnetically permeable material of the same material. Since the position where the magnetization magnetic field intensity of the magnetic pole detection sample S is the weakest is the two ends of the length direction of the substrate 3, the magnetization saturation of the magnet sample 1 at this position can be determined to determine the magnetic pole detection sample S. Magnetic saturation, which in turn can evaluate the magnetic saturation of the magnetic poles of the motor rotor.

Step S2: Magnetizing the magnetic pole detection sample S.

A magnetizing coil is provided on the magnetizing table, and the magnetic pole detection sample S can be placed on the magnetizing table, and a plurality of permanent magnets 2 and test columns 12 can be magnetized through the magnetizing coil.

Step S3: Detect the magnetization saturation of the magnet sample 1 to evaluate the magnetization saturation of the magnetic poles.

After magnetization of the magnetic pole detection sample S is completed, the magnet sample 1 can be taken out from the substrate 3 of the magnetic pole detection sample S, and then the magnetization saturation of the magnet sample 1 can be detected.

If the magnetic pole detection sample S utilizes the vacuum infusion molding process as described above, the resin is introduced into a plurality of permanent magnets 2 and magnet samples 1 through fiber cloth, and a plurality of permanent magnets 2 and magnet samples 1 and substrate 3 are formed. If the resin coating is bonded as one, the magnet sample 1 after magnetization can be removed from the magnetic pole detection sample S by infiltrating the resin.

Since the test column 12 in the magnet sample 1 can be magnetized, the detection of the magnetization saturation of the magnet sample 1 can be realized by detecting the magnetization effect of the test column 12 .

Specifically, in step S3, detecting the magnetization saturation of the magnet sample 1 to evaluate the magnetization saturation of the magnetic poles includes:

Step S31: Detect the residual magnetic induction of the test column 12 of the magnet sample 1 after magnetization;

Step S32: Determine the magnetization saturation of the magnetic pole according to the comparison result between the value of the residual magnetic induction and the preset value.

If the value of the residual magnetic induction of the magnet sample 1 is greater than or equal to the preset value, the magnetic poles are magnetized and saturated; if the value of the residual magnetic induction of the magnet sample 1 is less than the preset value, the magnetic poles are magnetized and unsaturated. , it is necessary to adjust the magnetization table, such as adjusting parameters such as the power of the magnetization table, or adjusting the number of turns of the magnetization coil, etc., to increase the magnetic field strength of the magnetization table.

Further, in step S31, detecting the residual magnetic induction of the test column 12 of the magnet sample 1 after magnetization includes:

Step S311: taking out the magnetized test column 12 from the carrier 11;

Step S312: detecting the hysteresis loop of the test column 12;

Step S313: Determine the residual magnetic induction of the test column 12 according to the hysteresis loop.

Fig. 6 shows a schematic diagram of a hysteresis loop of a test column of a magnet sample. Among them, the abscissa represents the magnetic field intensity H, the ordinate represents the magnetic induction intensity B, and the hysteresis loop is the closed magnetization curve of the hysteresis phenomenon of the ferromagnetic substance when the magnetic field intensity changes periodically. The hysteresis loop shows the relationship between the magnetic induction B and the magnetic field H in the process of repeated magnetization of ferromagnetic substances.

When the external magnetizing station applies a magnetic field to the magnetic pole detection sample S, a magnetic flux density will be generated on the permanent magnet 2 and the test column 12 of the magnetic pole detection sample S. After the magnetization is completed, the magnetic pole detection sample S is removed from the magnetization platform, and the magnetic field strength H=0 applied by the external magnetization platform, at this time, the magnetic flux density of the permanent magnet 2 and the test column 12 will not be reduced to zero immediately. A residual magnetic field appears, that is, residual magnetic induction.

If the value of the residual magnetic induction of test column 12 is greater than or equal to the preset value, then the magnetic pole realizes magnetization saturation; Adjust the magnetization table or magnetization coil to increase the magnetic field strength of the magnetization table.

Further, if the magnet sample 1 includes a plurality of test columns 12 arranged in an array on the carrier 11, the residual magnetic induction of each test column 12 can reflect that the corresponding position of the magnetic pole after magnetization is in the axial direction of the rotor and/or The magnetization effect in the circumferential direction. Therefore, a method for detecting magnetization saturation of a magnetic pole provided in an embodiment of the present invention further includes:

Step S33 : Detect the hysteresis loops of the test column 12 at different positions of the carrier 11 .

The multiple magnetized test columns 12 are taken out from the carrier 11 , the position of each test column 12 on the carrier 11 is recorded, and the hysteresis loop of each test column 12 is detected.

Step S34: Determine the residual magnetic induction of the test column 12 according to the hysteresis loop.

Step S35: Comparing the residual magnetic flux density of the test pillars 12 at different positions, so as to evaluate the magnetic flux consistency of the corresponding positions of the magnetic poles in the circumferential direction and/or axial direction of the rotor.

In addition, if the magnet sample 1 is located at any position between the two ends of the length direction of the substrate 3 and the plurality of permanent magnets 2, as shown in FIG. 4 , and optionally, each magnet sample 1 is included in a carrier 11, a plurality of test columns 12 arranged in an array, the detection method of a magnetic saturation of a magnetic pole provided by the embodiment of the present invention also includes:

Step S36: Detect the residual magnetic induction of the test column 12 of the magnet sample 1 at different positions of the magnetic pole detection sample S after magnetization;

Step S37: Comparing the residual magnetic induction of the test column 12 of the magnet sample 1 at different positions to evaluate the magnetic flux consistency of the magnetic poles in the circumferential and/or axial direction of the rotor.

The embodiment of the present invention provides a detection method for magnetization saturation of a magnetic pole, by arranging a magnet sample 1 for simulating a permanent magnet 2 of a magnetic pole in a magnetic pole detection sample S, and combining the magnet sample 1 and a plurality of permanent magnets The magnet 2 is assembled together to the position of the weak magnetizing magnetic field on the substrate to prepare the magnetic pole detection sample S for simulating the magnetic pole, and then magnetize the magnetic pole detection sample S to detect the magnetization of the magnetized sample 1 The residual magnetic induction intensity is compared with the preset value, so that the magnetization saturation of the entire magnetic pole can be effectively evaluated.

It can be understood that the method for detecting the magnetization saturation of the magnetic poles as described above is not only applicable to detecting the magnetization saturation of the magnetic poles of the motor rotor, but also applicable to other electronic devices including the magnetic poles of the similar structure.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (17)

1. a magnetic pole detection sample (S), for detecting the magnetization saturation of magnetic pole, it is characterized in that, described magnetic pole detection sample (S) comprises: Substrate (3); a plurality of permanent magnets (2); and A magnet sample (1), the magnet sample (1) and a plurality of permanent magnets (2) are arranged in a row along the length direction of the substrate (3) to form the magnetic poles, wherein the magnet sample The pieces (1) are at least located at both ends of the length direction of the substrate (3); the magnet sample has the same outer contour size as the permanent magnet (2), and the magnet sample (1) includes a Magnetized test column (12). 2. The magnetic pole detection sample (S) according to claim 1, characterized in that, the magnet sample (1) also includes a carrier (11), and the carrier (11) is made of a non-magnetic material. In this way, the test column (12) is arranged in the carrier (11), and the test column (12) is made of magnetically permeable material. 3. The magnetic pole detection sample (S) according to claim 2, characterized in that, the carrier (11) comprises a first surface (111) close to the yoke of the magnetic pole, and the test column (12 ) is inserted into the carrier (11) from the first surface (111) of the carrier (11). 4. The magnetic pole detection sample (S) according to claim 3, characterized in that, the carrier (11) is provided with a blind hole (11a) formed by inward depression of the first surface (111) The test column (12) is embedded in the blind hole (11a), and the end surface of the test column (12) away from the bottom surface of the blind hole (11a) is flush with the first surface (111). 5. The magnetic pole detection sample (S) according to claim 1, characterized in that the test column (12) is a cylindrical structure with a diameter of Φ10 mm and a length of 10 mm. 6. The magnetic pole detection sample (S) according to claim 2, is characterized in that, the quantity of described test column (12) is a plurality of, and a plurality of described test columns (12) are mounted on the carrier (11) ) arranged in an array. 7. The magnetic pole detection sample (S) according to claim 2, characterized in that the test column (12) is detachably connected to the carrier (11). 8. The magnetic pole detection sample (S) according to claim 2, characterized in that, the test column (12) is bonded to the carrier (11) by resin or glue. 9. The magnetic pole detection sample (S) according to claim 4, characterized in that, the material of the carrier (11) has self-lubricating properties; Or, the outer surface of the carrier (11) and/or the inner surface of the blind hole (11a) and/or the outer surface of the test column (12) is sprayed with a release agent; Alternatively, the outer surface of the carrier (11) and/or the inner surface of the blind hole (11a) and/or the outer surface of the test column (12) is provided with a release cloth. 10. The magnetic pole detection sample (S) according to claim 1, characterized in that at least one magnet sample (1) is provided at both ends of the substrate (3) in the longitudinal direction. 11. The magnetic pole detection sample (S) according to claim 1, characterized in that, the magnet sample (1) is also located between a plurality of the permanent magnets (2) on the substrate (3) any position. 12. The magnetic pole detection sample (S) according to claim 1, characterized in that, the plurality of permanent magnets (2) and the magnet sample (1) are bonded to the substrate (3) by resin and release the magnet sample (1) from the magnetic pole detection sample (S) by soaking the resin. 13. A detection method for magnetization saturation of a magnetic pole, characterized in that it comprises: providing the magnetic pole detection sample (S) as described in any one of claims 10 to 12; Magnetizing the magnetic pole detection sample (S); Detecting the magnetization saturation of the magnet sample (1) to evaluate the magnetization saturation of the magnetic poles. 14. detection method according to claim 13, is characterized in that, the magnetization saturation of described detection described magnet sample (1), to evaluate the magnetization saturation of described magnetic pole comprises: Detecting the residual magnetic induction of the test column (12) of the magnet sample (1) after magnetization; According to the comparison result between the value of the residual magnetic induction and the preset value, the magnetization saturation of the magnetic pole is determined. 15. detection method according to claim 14, is characterized in that, the residual magnetic induction intensity of the test column (12) of described magnet sample (1) after described detection magnetization comprises: The magnetized test column (12) is taken out from the carrier (11); Detect the hysteresis loop of the test column (12); The residual magnetic induction of the test column (12) is determined according to the hysteresis loop. 16. The detection method according to claim 13, characterized in that, the magnet sample (1) comprises a plurality of test columns (12) arranged in an array on the carrier (11), and the detection method also includes include: detecting the hysteresis loops of the test column (12) at different positions of the carrier (11); Determine the residual magnetic induction of the test column (12) according to the hysteresis loop; The residual magnetic induction of the test column (12) at different positions is compared to evaluate the magnetic flux consistency of the corresponding positions of the magnetic poles in the circumferential direction and/or axial direction. 17. The detection method according to claim 13 or 16, characterized in that, the magnet sample (1) is located at any one of the two ends of the length direction of the substrate (3) and a plurality of permanent magnets (2). position, the detection method also includes: Detecting the residual magnetic induction of the test column (12) of the magnet sample (1) at different positions of the magnetic pole detection sample (S) after magnetization; The residual magnetic induction of the test column (12) of the magnet sample (1) at different positions is compared to evaluate the magnetic flux consistency of the magnetic poles magnetized in the circumferential direction and/or axial direction of the rotor.

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