CN217904107U - Novel Halbach-like magnetic pole array configuration - Google Patents
Novel Halbach-like magnetic pole array configuration Download PDFInfo
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- CN217904107U CN217904107U CN202221652858.2U CN202221652858U CN217904107U CN 217904107 U CN217904107 U CN 217904107U CN 202221652858 U CN202221652858 U CN 202221652858U CN 217904107 U CN217904107 U CN 217904107U
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Abstract
The utility model discloses a novel Halbach-like magnetic pole array structure, which is formed by splicing a plurality of magnetic pole structure units with closed magnetic circuits in sequence, wherein the trend directions of the magnetic circuits of two adjacent magnetic pole structure units are opposite; the magnetic pole configuration unit comprises a first magnetic pole with an isosceles triangle cross section, two second magnetic poles with right-angled triangle cross sections and two third magnetic poles with rectangular cross sections, wherein the waist side surface of the first magnetic pole is spliced with the bevel side surface of the second magnetic pole, and the right-angled side surface of the third magnetic pole is spliced with the right-angled side surface of the second magnetic pole; the magnetizing directions of the first magnetic pole comprise horizontal leftward magnetizing and horizontal rightward magnetizing, the magnetizing directions of the second magnetic pole comprise inclined leftward downward magnetizing, inclined leftward upward magnetizing, inclined rightward downward magnetizing and inclined rightward upward magnetizing, and the magnetizing directions of the third magnetic pole comprise vertical upward magnetizing and vertical downward magnetizing. Adopt the utility model discloses, there is the magnetic leakage in the structure that can solve traditional rectangle Halbach magnetic pole array, the limited problem of unilateral reinforcing magnetic field effect.
Description
Technical Field
The utility model relates to the technical field of electric machines, especially, relate to a novel class halbach magnetic pole array configuration.
Background
At present, the output performance of the motor can be effectively improved by adopting a proper magnetic pole configuration, and the Halbach (Halbach) magnetic pole configuration is a common magnetic pole configuration, can shield a magnetic field on one side to enhance a magnetic field on the other side, reduces the consumption of back iron, and further improves the output force of the motor. Although the Halbach magnetic pole array has the advantages of increasing thrust and reducing magnetic leakage, the magnetic pole array formed by the rectangular magnet has poor magnetic field shielding effect (as shown in figure 1), cannot completely remove back iron, still has serious magnetic leakage and large magnetic field loss.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the novel Halbach-like magnetic pole array structure can solve the problems that the structure of the traditional rectangular Halbach magnetic pole array has magnetic leakage and the effect of a unilateral enhanced magnetic field is limited.
In order to achieve the above purpose, the utility model adopts the following scheme:
a novel Halbach-like magnetic pole array configuration is formed by sequentially splicing a plurality of magnetic pole configuration units with closed magnetic circuits, wherein the trend directions of the magnetic circuits of two adjacent magnetic pole configuration units are opposite; the magnetic pole configuration unit comprises a first magnetic pole with an isosceles triangle-shaped cross section, two second magnetic poles with right-angle triangles of cross sections and two third magnetic poles with rectangular cross sections, wherein the waist side surface of the first magnetic pole is spliced with the bevel side surface of the second magnetic pole, and the right-angle side surface of the third magnetic pole is spliced with the right-angle side surface of the second magnetic pole; in the same magnetic pole configuration unit, when the magnetization direction of the first magnetic pole is horizontal leftward magnetization, the magnetization direction of the second magnetic pole located in the left direction of the first magnetic pole is obliquely leftward upward magnetization, the magnetization direction of the third magnetic pole located in the left direction of the first magnetic pole is vertically upward magnetization, the magnetization direction of the second magnetic pole located in the right direction of the first magnetic pole is obliquely leftward downward magnetization, and the magnetization direction of the third magnetic pole located in the right direction of the first magnetic pole is vertically downward magnetization; when the magnetization direction of the first magnetic pole is horizontal right magnetization, the magnetization direction of the second magnetic pole in the left direction of the first magnetic pole is oblique right downward magnetization, the magnetization direction of the third magnetic pole in the left direction of the first magnetic pole is vertical downward magnetization, the magnetization direction of the second magnetic pole in the right direction of the first magnetic pole is oblique right upward magnetization, and the magnetization direction of the third magnetic pole in the right direction of the first magnetic pole is vertical upward magnetization.
As the preferred scheme of the utility model, adjacent two among the magnetic pole configuration unit, the third magnetic pole that is located the former magnetic pole configuration unit right side is same magnetic pole with the left third magnetic pole that is located the latter magnetic pole configuration unit.
As a preferable embodiment of the present invention, the magnetizing direction of the second magnetic pole is parallel to the inclined edge of the second magnetic pole.
As a preferred embodiment of the present invention, the included angle formed by the magnetizing direction of the second magnetic pole and the magnetizing direction of the first magnetic pole is 45 degrees.
Implement the utility model provides a novel class halbach magnetic pole array configuration compares with prior art, and its beneficial effect lies in:
(1) The utility model has good magnetic shielding effect, reduces magnetic energy loss, and can achieve the effect of using back iron in the traditional Halbach array, thereby avoiding using back iron, reducing the secondary quality of the motor, and improving the thrust density of the motor;
(2) The Halbach-like array adopted by the utility model can enhance the intensity of the magnetic field in the required area; compare with traditional Halbach array, the utility model discloses the longitudinal component of the magnetic flux density who produces is bigger, can provide bigger horizontal output power.
Drawings
FIG. 1 is a schematic structural diagram of a conventional rectangular Halbach pole array configuration;
fig. 2 is a schematic structural view of a novel halbach-like magnetic pole array configuration of an embodiment of the invention;
FIG. 3 is a field line profile of a gap field for the novel Halbach-like magnetic pole array configuration (no back iron) of this embodiment;
FIG. 4 is a graph of a comparison of the self-shielded magnetic field of a conventional rectangular Halbach pole array configuration (without back iron) and the novel Halbach-like pole array configuration of this embodiment (without back iron);
FIG. 5 is a graph of magnetic field strength comparison of a conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of this embodiment (without back iron);
fig. 6 is a comparison graph of airgap flux density waveforms when the conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of the present embodiment (without back iron) are applied to a double-sided linear motor, respectively;
fig. 7 is a FFT comparison graph of the conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of the present embodiment (without back iron) applied to a double-sided linear motor, respectively;
fig. 8 is a graph comparing the mean and ripple of the static output force when the conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of the present embodiment (without back iron) are applied to a double-sided linear motor, respectively.
Reference numerals are as follows:
a first magnetic pole 1; a second magnetic pole 2; a third pole 3.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the directional descriptions, such as the directions or positional relationships indicated by upper, lower, front, rear, left, right, etc., are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the terms in the present invention by combining the specific contents of the technical solution.
As shown in fig. 2, the novel halbach-like magnetic pole array configuration provided by the embodiment of the present invention is formed by sequentially splicing a plurality of magnetic pole configuration units with closed magnetic circuits, and the trend directions of the magnetic circuits of two adjacent magnetic pole configuration units are opposite; the magnetic pole configuration unit comprises a first magnetic pole 1 with an isosceles triangle cross section, two second magnetic poles 2 with right-angled triangle cross sections and two third magnetic poles 3 with rectangular cross sections, wherein the side surface of the waist side of the first magnetic pole 1 is spliced with the side surface of the bevel edge of the second magnetic pole 2, and the side surface of the right angle of the third magnetic pole 3 is spliced with the side surface of the right angle of the second magnetic pole 2; in the same magnetic pole configuration unit, when the magnetization direction of the first magnetic pole 1 is horizontal leftward magnetization, the magnetization direction of the second magnetic pole 2 located in the left side direction of the first magnetic pole 1 is oblique leftward upward magnetization, the magnetization direction of the third magnetic pole 3 located in the left side direction of the first magnetic pole 1 is vertical upward magnetization, the magnetization direction of the second magnetic pole 2 located in the right side direction of the first magnetic pole 1 is oblique leftward downward magnetization, and the magnetization direction of the third magnetic pole 3 located in the right side direction of the first magnetic pole 1 is vertical downward magnetization; when the magnetizing direction of the first magnetic pole 1 is horizontal right magnetizing, the magnetizing direction of the second magnetic pole 2 in the left side direction of the first magnetic pole 1 is oblique right downward magnetizing, the magnetizing direction of the third magnetic pole 3 in the left side direction of the first magnetic pole 1 is vertical downward magnetizing, the magnetizing direction of the second magnetic pole 2 in the right side direction of the first magnetic pole 1 is oblique right upward magnetizing, and the magnetizing direction of the third magnetic pole 3 in the right side direction of the first magnetic pole 1 is vertical upward magnetizing. In this embodiment, in two adjacent magnetic pole configuration units, the third magnetic pole 3 located on the right side of the previous magnetic pole configuration unit and the third magnetic pole 3 located on the left side of the next magnetic pole configuration unit are the same magnetic pole. The magnetizing direction of the second magnetic pole 2 is parallel to the inclined edge of the second magnetic pole 2, or the included angle formed by the magnetizing direction of the second magnetic pole 2 and the magnetizing direction of the first magnetic pole 1 is 45 degrees.
Of course, in other embodiments, the cross section of the first magnetic pole 1 may also be an isosceles trapezoid.
Next, in order to verify the difference between the configuration of the novel Halbach-like magnetic pole array provided by the embodiment of the present invention and the configuration of the conventional rectangular Halbach magnetic pole array, the following comparative simulation experiment is performed:
using electromagnetic finite element simulation software ANSYS Electronics Desktop, under the same motor size condition, comparing the configuration of the conventional rectangular Halbach magnetic pole array with back iron with the configuration of the novel Halbach-like magnetic pole array of the present embodiment, fig. 1 shows the air-gap magnetic field lines distribution of the conventional rectangular Halbach magnetic pole array configuration (with back iron), and fig. 3 shows the air-gap magnetic field lines distribution of the novel Halbach-like magnetic pole array configuration (without back iron) of the present embodiment. It can be seen from fig. 1 and 3 that the two Halbach magnetic pole array configurations have the functions of enhancing the magnetic field on one side and weakening the magnetic field on the other side, and it can also be seen that the novel Halbach array is not additionally provided with back iron, the magnetic shielding effect is very good, and the reason is that the special shape is matched with the magnetizing direction, so that the direction of the magnetic force line is changed in the array without the help of the back iron in the external range of the array.
Fig. 4 shows a self-shielded field contrast for a conventional rectangular Halbach pole array configuration (no back iron) and the novel Halbach-like pole array configuration of the present embodiment (no back iron). Since the magnetic pole array is periodic, the leakage flux in one period is taken for verification. It can be seen from fig. 4 that the thickness pole distance of the novel Halbach-like magnetic pole array configuration is the same as that of the conventional rectangular Halbach magnetic pole array configuration, the magnetic flux density of the air region with the magnetic shielding side is compared, the solving path is the magnetic leakage side, and it can be seen that the magnetic leakage of the shielding side of the novel Halbach-like magnetic pole array configuration is about 100mT, and the magnetic leakage of the Halbach magnetic shielding side without back iron reaches 350mT, which is far greater than that of the novel Halbach-like magnetic pole array configuration of the embodiment. Therefore, the novel halbach-like magnetic pole array configuration of the present embodiment can effectively reduce the back iron thickness.
Figure 5 shows a comparison of magnetic field strength for a conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of this embodiment (without back iron). Because the magnetic pole array is periodic, only the tangential magnetic field generates effective output force, and the tangential strength of the magnetic field in one period is taken for verification. The thickness polar distance of the novel Halbach-like magnetic pole array configuration and the traditional rectangular Halbach magnetic pole array configuration is the same, and as can be seen from fig. 5, the effective magnetic field intensity of the novel Halbach-like magnetic pole array configuration of the embodiment is obviously greater than that of the traditional rectangular Halbach magnetic pole array configuration with back iron, and the back iron is removed from the novel Halbach-like magnetic pole array configuration of the embodiment, so that the thrust density is further improved.
Under the condition of the same motor size, the traditional rectangular Halbach array configuration with back iron and the novel Halbach-like magnetic pole array configuration of the embodiment are compared, the axial distance distribution waveform in one period of the air-gap magnetic field is obtained, and Fourier decomposition is carried out on the waveform. Fig. 6 shows a comparison of airgap flux density waveforms when the conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of the present embodiment (without back iron) are applied to a double-sided linear motor, respectively; fig. 7 shows FFT comparisons when the conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of the present embodiment (without back iron) are applied to a double-sided linear motor, respectively. As can be seen from fig. 6 and 7, even though the back iron is added, the air gap magnetic density of the conventional rectangular Halbach array configuration is smaller than that of the novel Halbach-like magnetic pole array configuration of the present embodiment, and the novel Halbach-like magnetic pole array configuration of the present embodiment can remove the structure of the back iron to reduce the weight of the motor. The fundamental wave of the air gap magnetic field of the novel Halbach-like magnetic pole array configuration of the embodiment accounts for 90.86% of the harmonic component; and the air gap field fundamental wave of the traditional rectangular Halbach array configuration with back iron accounts for 82.81% of the harmonic component. Since the fundamental component of the air-gap magnetic field generated by the novel Halbach-like magnetic pole array configuration of the present embodiment is significantly larger than the conventional rectangular Halbach array configuration, and the harmonic component is smaller than the conventional rectangular Halbach array configuration, the air-gap flux density waveform of the novel Halbach-like magnetic pole array configuration of the present embodiment is better in sine property, and the air-gap flux density is larger than the conventional rectangular Halbach array configuration. However, the harmonic component of the air gap flux density is related to the output force fluctuation, and the fundamental component is related to the output force average value of the motor, that is, the larger the fundamental component is, the larger the thrust average value of the motor is, the smaller the harmonic is, the smaller the thrust fluctuation is, and the better the output performance of the motor is.
Fig. 8 shows the average and ripple comparison of static output force when the conventional rectangular Halbach pole array configuration (with back iron) and the novel Halbach-like pole array configuration of the present embodiment (without back iron) are applied to a double-sided linear motor, respectively. As can be seen from fig. 8, the thrust mean value of the novel halbach-like magnetic pole array configuration of the present embodiment is 49.3794N, and the thrust fluctuation is 1.52%. The average thrust value of the traditional rectangular Halbach magnetic pole array configuration is 30.9520, and the thrust fluctuation is 16.70%. Therefore, the average value of the thrust of the novel Halbach-like magnetic pole array configuration of the embodiment is improved by 37.32% compared with the thrust of the conventional rectangular Halbach magnetic pole array configuration under the condition of the same motor size, the thrust fluctuation is reduced by 90.90%, and the novel Halbach-like magnetic pole array configuration of the embodiment has greater advantages.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (4)
1. A novel Halbach-like magnetic pole array configuration is formed by sequentially splicing a plurality of magnetic pole configuration units with closed magnetic circuits, wherein the trend directions of the magnetic circuits of two adjacent magnetic pole configuration units are opposite; the magnetic pole configuration unit comprises a first magnetic pole with an isosceles triangle cross section, two second magnetic poles with right-angled triangles cross section and two third magnetic poles with a rectangular cross section, wherein the side surface of the waist side of the first magnetic pole is spliced with the side surface of the bevel edge of the second magnetic pole, and the side surface of the right angle of the third magnetic pole is spliced with the side surface of the right angle of the second magnetic pole;
in the same magnetic pole configuration unit, when the magnetization direction of the first magnetic pole is horizontal leftward magnetization, the magnetization direction of the second magnetic pole located in the left direction of the first magnetic pole is obliquely leftward upward magnetization, the magnetization direction of the third magnetic pole located in the left direction of the first magnetic pole is vertically upward magnetization, the magnetization direction of the second magnetic pole located in the right direction of the first magnetic pole is obliquely leftward downward magnetization, and the magnetization direction of the third magnetic pole located in the right direction of the first magnetic pole is vertically downward magnetization; when the magnetization direction of the first magnetic pole is horizontal right magnetization, the magnetization direction of the second magnetic pole in the left direction of the first magnetic pole is oblique right downward magnetization, the magnetization direction of the third magnetic pole in the left direction of the first magnetic pole is vertical downward magnetization, the magnetization direction of the second magnetic pole in the right direction of the first magnetic pole is oblique right upward magnetization, and the magnetization direction of the third magnetic pole in the right direction of the first magnetic pole is vertical upward magnetization.
2. The new halbach-like magnetic pole array configuration as claimed in claim 1, wherein the third magnetic pole on the right side of the previous magnetic pole configuration unit and the third magnetic pole on the left side of the subsequent magnetic pole configuration unit in two adjacent magnetic pole configuration units are the same magnetic pole.
3. The new halbach-like pole array configuration as claimed in claim 1, wherein the direction of magnetization of the second pole is parallel to the hypotenuse of the second pole.
4. The new halbach-like pole array configuration of claim 1, wherein the angle formed by the direction of magnetization of the second pole and the direction of magnetization of the first pole is 45 degrees.
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| CN202221652858.2U CN217904107U (en) | 2022-06-29 | 2022-06-29 | Novel Halbach-like magnetic pole array configuration |
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| CN202221652858.2U CN217904107U (en) | 2022-06-29 | 2022-06-29 | Novel Halbach-like magnetic pole array configuration |
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