CN113206565A - Magnetic shoe for motor, motor rotor and motor - Google Patents
Magnetic shoe for motor, motor rotor and motor Download PDFInfo
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- CN113206565A CN113206565A CN202110523859.0A CN202110523859A CN113206565A CN 113206565 A CN113206565 A CN 113206565A CN 202110523859 A CN202110523859 A CN 202110523859A CN 113206565 A CN113206565 A CN 113206565A
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- 230000005284 excitation Effects 0.000 claims abstract description 81
- 230000006698 induction Effects 0.000 claims abstract description 57
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000000465 moulding Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Electromagnetism (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a magnetic shoe, which is used for a permanent magnet motor with a rotor core and a stator core arranged along the axial direction of a rotor in a staggered way, and comprises: the excitation part is covered on the peripheral surface of the rotor core and is matched with the stator air gap to form an excitation loop; the dislocation part is formed on the first end surface of the excitation part, and protrudes out of the stator core end surface and the rotor core end surface on the same side at the end side dislocation part so as to form dislocation arrangement with the stator core and the rotor core; the dislocation section includes: an induction part for being induced by a rotor position induction element of the motor; and a magnetic bridge for connecting the induction part and the excitation part.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a magnetic shoe for a motor, a motor rotor and a motor.
Background
With the development of the motor technology, the motor has an iron shell structure and a plastic package structure. The built-in sensing and controlling motor cannot sense the position of the rotor due to the fact that the distance between the rotor position sensing element and the surface-mounted permanent magnet is insufficient, the rotor and the stator are often required to be placed in a staggered mode, as shown in fig. 1, the staggered distance between the stator 1 and the rotor 2 is L1 (according to actual conditions), and the distance between the permanent magnet on the rotor and the position sensing element 3 on the control board is satisfied; meanwhile, after the permanent magnets are placed asymmetrically, the height of the permanent magnets needs to be higher than that of the iron cores of the stator and the rotor so as to avoid influencing a magnetic circuit in an air gap.
However, because the permanent magnets are symmetrical relative to the rotor, after the stator and rotor cores are misplaced, the permanent magnets are not equal in height on two sides relative to the stator, so that the parts of the permanent magnets on the higher side of the stator attract each other with the stator core to generate magnetic tension, and the rotor is subjected to certain axial magnetic tension integrally. The axial magnetic tension and the pulsation cause the abnormal vibration of the motor during operation and generate noise; meanwhile, due to the existence of axial magnetic pull, a bearing and a wave pad of the motor are in a long-term stress state, and the performance and the service life of the motor are seriously influenced.
Disclosure of Invention
In view of this, the invention discloses a magnetic shoe for a motor, a motor rotor and a motor, which are used for at least solving the problem that the motor rotor is subjected to larger axial magnetic pull force.
In order to achieve the above object, the invention adopts the following technical scheme:
the invention discloses a magnetic shoe in a first aspect, which is used for a permanent magnet motor with a rotor core and a stator core arranged along the axial direction of a rotor in a staggered manner, and comprises:
the excitation part is covered on the peripheral surface of the rotor core and is matched with the stator air gap to form an excitation loop;
the dislocation part is formed on the first end surface of the excitation part, and protrudes out of the stator core end surface and the rotor core end surface on the same side at the end side dislocation part so as to form dislocation arrangement with the stator core and the rotor core;
the dislocation section includes: an induction part for being induced by a rotor position induction element of the motor; and a magnetic bridge for connecting the induction part and the excitation part.
Further optionally, the sensing part is of a strip structure; the excitation part is of a plate-shaped structure, the excitation part and the induction part are arranged in a bending mode in the circumferential direction of the motor rotor, and the staggered placement distance of the stator core and the rotor core is equal to the asymmetric thickness of the magnetic shoe relative to the stator core.
Further optionally, the excitation part is arranged offset from the induction part,
the first end of the induction part is connected with the first end face of the excitation part through the magnetic bridge, and the second end of the induction part extends around the motor rotor in the circumferential direction away from the first end face of the excitation part.
Further optionally, a first side surface of the sensing part is formed on a side of the sensing part facing away from the rotor position sensing element,
wherein the first side of the induction part is arranged in parallel with the first end of the excitation part.
Further optionally, the width L of the magnetic bridge3Is the width L of the excitation part230 to 50 percent of the total weight of the composition.
As a further alternative it is possible that,
the induction part is arranged in parallel with the first end face of the excitation part;
the magnetic bridge includes: the first magnetic bridge is used for connecting a first end of the magnetic bridge with a first end face of the excitation part; and the second magnetic bridge is used for connecting the second end of the magnetic bridge with the first end surface of the excitation part.
Further optionally, the first end faces of the sensing part, the first magnetic bridge, the second magnetic bridge and the excitation part are matched to form a hollow structure so as to reduce the volume of the dislocation part.
Further optionally, the width of the first magnetic bridge is the same as that of the second magnetic bridge, and the width L of the first magnetic bridge5Is the length L of the excitation part 45 to 15 percent of the total weight of the composition.
Further optionally, the induction part is arranged in parallel with the first end face of the excitation part;
one end of the magnetic bridge is connected with the induction part, and the other end of the magnetic bridge is connected with the first end face of the excitation part; wherein the first end faces of the induction portion, the magnetic bridge and the excitation portion cooperate to form an i-shaped structure to reduce the volume of the offset portion.
Further optionally, the width L of the magnetic bridge7Is the length L of the excitation part 65 to 15 percent of the total weight of the composition.
A second aspect of the present invention discloses an electric motor rotor, comprising:
a rotor;
and a plurality of magnetic shoes which are wrapped and molded outside the rotor, wherein the magnetic shoes adopt any one of the magnetic shoes.
A third aspect of the invention discloses an electrical machine comprising an electrical machine rotor as described above.
Has the advantages that: the magnetic shoe on the rotor adopts a novel structure permanent magnet structure, so that the axial magnetic tension can be greatly reduced under the condition that the stator and the rotor are placed in a staggered mode, compared with the traditional surface-mounted permanent magnet, the magnetic tension of the rotor is reduced by 40-60%, and the performance of the motor is improved; meanwhile, the air gap magnetic density waveform is not influenced, and other performances of the motor are not influenced under the condition of ensuring that the axial magnetic pull force is reduced. The permanent magnet is simple in structure and low in production cost, has performance advantages compared with the original permanent magnet, greatly improves the performance ratio of the motor, and improves the market competitiveness.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings. The drawings described below are merely exemplary embodiments of the present disclosure, and other drawings may be derived by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram illustrating a stator and rotor misplacement in the prior art;
fig. 2 is a view showing a structure of a conventional surface-mount permanent magnet;
FIG. 3 is a graph showing simulation results of axial magnetic tension of a conventional permanent magnet rotor;
FIG. 4 shows a "Z" shaped permanent magnet configuration according to one embodiment of the present invention;
FIG. 5 shows a mating view of two "Z" shaped permanent magnets of one embodiment of the present invention;
FIG. 6 shows a "Z" shaped permanent magnet of one embodiment of the present invention fitted in a circle;
FIG. 7 is a diagram showing simulation results of axial magnetic tension of a rotor applying a "Z" -shaped permanent magnet according to an embodiment of the present invention;
FIG. 8 shows a construction of a "back" type permanent magnet according to an embodiment of the invention;
FIG. 9 shows a "hui" type permanent magnet of one embodiment of the present invention fitted in a circle;
FIG. 10 is a graph showing simulation results of the axial magnetic pull force of a rotor applying a "hui" type permanent magnet according to an embodiment of the present invention;
FIG. 11 shows a construction of an "I" type permanent magnet according to an embodiment of the invention;
FIG. 12 shows an "I" shaped permanent magnet of one embodiment of the present invention fitted in a circle;
FIG. 13 is a diagram showing simulation results of axial magnetic tension of an rotor using an I-shaped permanent magnet according to an embodiment of the present invention;
fig. 14 shows a comparison graph of axial magnetic pull force of permanent magnets of different structures according to the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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 terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and "a" and "an" generally include at least two, but do not exclude at least one, unless the context clearly dictates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
At present traditional surface-mounted permanent magnet structure is as shown in fig. 1-3, and is made into the plastic-coated rotor with rotor core for built-in sense control, and the motor includes: stator core 1, rotor core 2, control panel 3, in view of the required induction distance of inductive element, with stator rotor dislocation place, make the magnetic shoe as close to inductive element as possible, this makes the rotor inevitably bear the influence of axial magnetic pulling force. The result of the simulation axial magnetic tension by misplacing the actual model is shown in fig. 3, and the unilateral magnetic tension borne by the rotor is 15N. The existence of axial magnetic pull and the fluctuation of the axial magnetic pull lead to the aggravation of vibration when the motor runs, noise is generated, and the performance of the motor is reduced. The invention provides a plurality of magnetic shoes with Z-shaped, Hui-shaped or I-shaped shapes by improving the permanent magnet structure of the rotor; the magnetic shoe divides the same permanent magnet into two parts, one part is matched with the air gap of the stator to form an excitation loop; one part of the permanent magnet is matched with the adjacent permanent magnet and is matched with a position sensing element of the controller at the same time, so that the position of the rotor is sensed, and the magnetic tension is reduced; the two are connected and fixed through a magnetic bridge.
To further illustrate the technical solution of the present invention, the following specific examples are provided as shown in fig. 4 to 14.
Example 1
In the embodiment, a magnetic shoe for a motor is provided, which is used for a permanent magnet motor with a rotor core and a stator core arranged along the axial direction of a rotor in a staggered mode. The motor includes electric motor rotor and stator, and this magnetic shoe includes:
the excitation part is covered on the peripheral surface of the rotor core and is matched with the stator air gap to form an excitation loop;
and a misalignment portion formed at a first end surface of the excitation portion, at which the misalignment portion protrudes a stator core end surface and a rotor core end surface on the same side to be misaligned with the stator core and the rotor core, wherein the misalignment portion includes: the induction part is used for being induced by a rotor position induction element of the motor; and the magnetic bridge is used for connecting the induction part and the excitation part so as to enable the induction part and the excitation part to be staggered or reduce the volume of the staggered part.
If the permanent magnet is made into a magnetic shoe with a Z-shaped, a square-shaped or an I-shaped structure, the magnetic shoe is characterized in that: the asymmetric part of the permanent magnet relative to the stator core and the excitation part of the air gap are completely staggered along the outer contour direction of the rotor, or the permanent magnet material of the asymmetric part of the permanent magnet relative to the stator core is reduced, so that the axial magnetic pull force of the whole rotor when the stator and the rotor are placed asymmetrically is reduced. Furthermore, the outer circular arc of the permanent magnet is designed to be composed of three sections of circular arcs. The misplaced distance between the stator core and the rotor core is equal to the asymmetric thickness of the magnetic shoe relative to the stator core, namely the integral thickness of the permanent magnet of the induction part along the direction parallel to the axis of the motor rotor.
In some alternatives, the magnetic shoe is made "Z" shaped. At this time, the induction part is in a strip structure, the excitation part is in a plate structure, and the excitation part and the induction part are both arranged in a bending mode around the circumferential direction of the motor rotor. In this method, the exciting portion and the sensing portion are arranged in a staggered manner. Preferably: the first end 51 of the induction part is connected with the first end surface A of the excitation part through a magnetic bridge, and the second end 52 of the induction part extends around the circumferential direction of the motor rotor in the direction far away from the first end surface of the excitation part. And a first side surface of the induction part is formed on one side of the induction part, which is back to the rotor position induction element, wherein the first side surface of the induction part is parallel to the first end surface A of the excitation part. It should be noted that two parts of the "Z" shaped permanent magnet are completely staggered from each other, and the induction part 5 and the excitation part 4 as shown in fig. 4 form two upper and lower bars of "Z"; the two parts are connected by a magnetic bridge 6, as shown in figure 4, to form a connecting part in the middle of Z; the three parts together form a similar Z-shaped structure.
Specifically, the method comprises the following steps: the magnetic shoe is a Z-shaped surface-mounted permanent magnet structure, the structure of the magnetic shoe is shown in figure 4, one magnetic shoe is divided into two parts, an excitation part 4 is an excitation part of the magnetic shoe in an air gap, an induction part 5 is an asymmetric part of the magnetic shoe, and the height of the induction part can be set as an asymmetric part L of the permanent magnet relative to a stator iron core1The magnetic bridge 6 is connected with the excitation part 4 and the induction part 5, the width L3 of the magnetic bridge 6 increases the axial magnetic pull force of the rotor in consideration of the structural strength and the increase of the permanent magnet parts for avoiding asymmetry, and the width L3 of the magnetic bridge is designed to be 30-50% of the width L2 of the excitation part (namely the radial thickness of the permanent magnet); the matching relationship of the Z-shaped permanent magnets in the embodiment is shown in fig. 5, two Z-shaped permanent magnets a and b are matched, the magnetizing directions of the a and b are different, the a5 is placed above the b4, the two have mutual magnetic tension, the b5 is placed above the excitation part 4 of the next permanent magnet, and the like, and the structures of the permanent magnets and the excitation part are matchedThe adjacent permanent magnets are matched into a circle as shown in fig. 6, the air gap flux density waveform is not affected, the induction element with the built-in control board can normally induce the position of the rotor, and the influence on the performance of the motor is small. The result of the simulation axial magnetic tension by misplacing the actual model is shown in fig. 7, and the axial magnetic tension is 6N; compared with an axial magnetic tension curve generated by applying a traditional permanent magnet under the same model, as shown in fig. 14, the axial magnetic tension curve is reduced by 60% compared with the axial magnetic tension curve of the original permanent magnet, the improvement effect is obvious, and meanwhile, the fluctuation of the magnetic tension is also reduced in fig. 7.
In some alternatives, the magnetic shoe is made in a "return" configuration. The induction part 5 is arranged in parallel with the first end face of the excitation part 4; the magnetic bridge includes: a first magnetic bridge 91 for connecting a first end of the magnetic bridge with a first end face of the excitation part; and a second magnetic bridge 92 for connecting the second end of the magnetic bridge with the first end face a of the excitation portion, as shown in fig. 8. Wherein: the induction part 5, the first magnetic bridge 91, the second magnetic bridge 92 and the first end face a of the excitation part are matched to form a hollow structure so as to reduce the volume of the dislocation part. This hollow out construction can be the opening of rectangle mouth or circular mouth or other shapes, when adopting the rectangle mouth, forms the type mouth that returns of type structure promptly.
Specifically, when the magnetic shoe is made into a permanent magnet with a "return" structure, as shown in fig. 8, one permanent magnet is divided into two parts, wherein an excitation part 8 is an excitation part of the magnetic shoe in an air gap; the sensing part 7 is a position sensing element part of the permanent magnet matching controller, and in order to cause the reaction of the position sensor hall element, the thickness of the permanent magnet of the sensing part 7 (namely, the thickness of the sensing part in the direction perpendicular to the first end surface of the excitation part) should be controlled in a thickness range that the generated magnetic density is more than 15 Gs; the first magnetic bridge 91 and the second magnetic bridge 92 connect the induction portion 7 and the excitation portion 8, respectively, preferably: the width of the first magnetic bridge is the same as that of the second magnetic bridge. The width of the first magnetic bridge 91 and the width of the second magnetic bridge 92 are both L5The width L5The length L of the field portion should be set to increase the axial magnetic pulling force of the rotor in consideration of the structural strength and the prevention of the increase of the asymmetrical permanent magnet portion4(i.e., permanent magnet)Circumferential length) of 10%; the permanent magnet structure and a plurality of permanent magnets with the same structure are matched into a circle as shown in fig. 9, the air gap flux density waveform is not influenced, the induction element with the built-in control board can normally induce the position of the rotor, and the influence on the performance of the motor is small. Through the misplacement of the actual model, the result of performing electromagnetic field simulation on the axial magnetic tension is shown in fig. 10, the axial magnetic tension is about 9N, compared with an axial magnetic tension curve generated by applying a traditional permanent magnet under the same model, as shown in fig. 14, the axial magnetic tension simulation is reduced by 40% compared with the axial magnetic tension of the original permanent magnet under the same torque and the same rotating speed, the reduction amplitude of the axial magnetic tension is slightly reduced compared with that of the first embodiment, but the improvement effect is obvious on the whole.
In some alternatives, the magnetic shoe is formed in an "I" configuration. The induction part is arranged in parallel with the first end face of the excitation part; one end of the magnetic bridge is connected with the induction part, and the other end of the magnetic bridge is connected with the first end face of the excitation part; the first end faces of the induction part, the magnetic bridge and the excitation part are matched to form an I-shaped structure so as to reduce the volume of the dislocation part. Preferably: width L of magnetic bridge7Is the length L of the excitation part 65 to 15 percent of the total weight of the composition.
Specifically, the method comprises the following steps: the magnetic shoe in the embodiment adopts an I-shaped permanent magnet for reducing the axial magnetic pull force, the structure is shown in fig. 11, one magnetic shoe is divided into two parts, and the excitation part 11 in the figure is an excitation part of the magnetic shoe in an air gap; the sensing part 10 is a position sensing element part of the permanent magnet matching controller, and in order to cause the reaction of the position sensor hall element, the thickness of the permanent magnet of the sensing part 10 (namely, the thickness of the sensing part in the direction perpendicular to the first end surface of the excitation part) should be controlled to be within the thickness range of more than 15 Gs; the magnetic bridge 12 connects the induction part 10 and the excitation part 11, and the width L of the magnetic bridge 127The length L of the field portion should be set to increase the axial magnetic pulling force of the rotor in consideration of the structural strength and the prevention of the increase of the asymmetrical permanent magnet portion6(i.e., the circumferential length of the permanent magnet) 10%; the permanent magnet structure and a plurality of permanent magnets with the same structure are matched into a circle as shown in figure 12, the air gap flux density waveform is not influenced, and the built-in control is realizedThe induction element of the plate can normally induce the position of the rotor, and the performance of the motor is not greatly influenced. Through actual model dislocation placement, carry out electromagnetic field simulation axial magnetic pulling force result as shown in fig. 13, its axial magnetic pulling force is about 9N, and compare with the axial magnetic pulling force curve that uses traditional permanent magnet to produce under the same model as shown in fig. 14, compare and reduce 40% in original permanent magnet axial magnetic pulling force, and the axial magnetic pulling force that reduces with the second implementation mode is equivalent, and the axial magnetic pulling force reduction amplitude of relative first implementation mode slightly descends, but improves the effect on the whole obviously.
It should be noted that, the asymmetric end part of the permanent magnet in the shape of "go back" or "worker" relative to the stator core hollows out redundant permanent magnet material according to the actual situation, and under the condition that the position sensing element on the control panel can sense, the permanent magnet with the structure is connected through the magnetic bridge and matched with a plurality of permanent magnets to be manufactured into the plastic-coated rotor together with the rotor core. In the structure of the 'back' type permanent magnet, a rectangular hole is dug in the middle of the permanent magnet relative to the asymmetric part of the stator core, and as shown in fig. 8, the permanent magnet after the rectangular hole is dug forms a similar 'back' type structure; the permanent magnet is hollowed out equally on two sides of the asymmetric part of the permanent magnet relative to the stator core, only one magnetic bridge in the middle is left to connect the upper part and the lower part, as shown in fig. 11, an induction part 10 and an excitation part 11 are the upper part and the lower part, a magnetic bridge 12 connects the two parts, and the three parts in fig. 11 form a similar I-shaped structure.
Example 2
In this embodiment, there is provided a motor rotor including: a rotor; and a plurality of magnetic shoes which are wrapped and molded outside the rotor, wherein the magnetic shoes adopt any one of the magnetic shoes. Namely, the rotor is wrapped and molded by a circle surrounded by any one of the Z-shaped, the return-shaped or the I-shaped permanent magnet structures (magnetic shoes). It should be noted that the occupation ratio of each magnetic shoe is determined according to the actual magnetic pole scheme (i.e., the occupation ratio of each magnetic shoe is determined according to the actual magnetic pole 8P, 10P.... times.scheme of the motor); after the stator and rotor iron cores are placed in a staggered mode through the structure, compared with the existing permanent magnet structure, the permanent magnet structure disclosed by the invention has the advantages that the axial magnetic tension is greatly reduced, and the effect is obvious. Under the condition that other performances of the motor are not greatly influenced, the noise is improved, and the service life of the motor is prolonged.
Example 3
In this embodiment, an electrical machine is provided, comprising the above-described machine rotor or magnetic shoe. Because the stator and the rotor of the motor are asymmetrically arranged, the permanent magnet of the motor rotor in the embodiment adopts a Z-shaped, return-shaped or I-shaped structure, and the rotor is formed by wrapping and molding a plurality of permanent magnets with the same structure, so that the axial magnetic tension can be greatly reduced, and the problems that the bearing and the wave pad are stressed for a long time due to the influence of the axial magnetic tension of the motor rotor, and the performance and the service life of the motor are seriously influenced are solved.
The permanent magnet adopts a Z-shaped, return-shaped or I-shaped structure, and the asymmetric part of the permanent magnet relative to the stator core and the outer contour of the excitation part of the air gap adopt the same three-segment arc structure, so that the problem of overlarge motor torque and magnetic pull pulsation is solved.
Exemplary embodiments of the present disclosure are specifically illustrated and described above. It is to be understood that the present disclosure is not limited to the precise arrangements, instrumentalities, or instrumentalities described herein; on the contrary, the disclosure is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (13)
1. The utility model provides a magnetic shoe for rotor core and stator core along the permanent-magnet machine of rotor axial dislocation set, its characterized in that, the magnetic shoe includes:
the excitation part is covered on the peripheral surface of the rotor core and is matched with the stator air gap to form an excitation loop;
the dislocation part is formed on the first end surface of the excitation part, and protrudes out of the stator core end surface and the rotor core end surface on the same side at the end side dislocation part so as to form dislocation arrangement with the stator core and the rotor core;
the dislocation section includes: an induction part for being induced by a rotor position induction element of the motor; and a magnetic bridge for connecting the induction part and the excitation part.
2. The magnetic shoe of claim 1, wherein the sensing portion is an elongated structure; the excitation part is of a plate-shaped structure, the excitation part and the induction part are arranged in a bending mode in the circumferential direction of the motor rotor, and the staggered placement distance of the stator core and the rotor core is equal to the asymmetric thickness of the magnetic shoe relative to the stator core.
3. The magnetic shoe of claim 2, wherein the excitation portion is disposed offset from the induction portion,
the first end of the induction part is connected with the first end face of the excitation part through the magnetic bridge, and the second end of the induction part extends around the motor rotor in the circumferential direction away from the first end face of the excitation part.
4. The magnetic shoe of claim 3, wherein a side of the sensing portion facing away from the rotor position sensing element is formed with a sensing portion first side surface,
wherein the first side of the induction part is arranged in parallel with the first end of the excitation part.
5. The magnetic shoe according to claim 4, characterized in that said bridge has a width L3Is the width L of the excitation part230 to 50 percent of the total weight of the composition.
6. The magnetic shoe according to claim 1,
the induction part is arranged in parallel with the first end face of the excitation part;
the magnetic bridge includes: the first magnetic bridge is used for connecting a first end of the magnetic bridge with a first end face of the excitation part; and the second magnetic bridge is used for connecting the second end of the magnetic bridge with the first end surface of the excitation part.
7. The magnetic shoe of claim 6, wherein the first end surfaces of the induction portion, the first magnetic bridge, the second magnetic bridge and the excitation portion are cooperatively formed with a hollowed-out structure to reduce the volume of the offset portion.
8. The magnetic shoe of claim 6, wherein the first magnetic bridge has a width that is the same as the second magnetic bridge, and wherein the first magnetic bridge has a width L5Is the length L of the excitation part45 to 15 percent of the total weight of the composition.
9. The magnetic shoe according to claim 1, characterized in that the induction portion is disposed in parallel with the first end face of the excitation portion;
one end of the magnetic bridge is connected with the induction part, and the other end of the magnetic bridge is connected with the first end face of the excitation part; wherein the first end faces of the induction portion, the magnetic bridge and the excitation portion cooperate to form an i-shaped structure to reduce the volume of the offset portion.
10. The magnetic shoe according to claim 9, characterized in that said magnetic bridge has a width L7Is the length L of the excitation part65 to 15 percent of the total weight of the composition.
11. A surface-mounted permanent magnet is characterized in that: formed by a plurality of circumferential connections of magnetic tiles according to any of claims 1 to 10.
12. A permanent magnet electric machine rotor, comprising:
a rotor core;
and a plurality of magnetic shoes which are coated and molded outside the rotor, wherein the magnetic shoes are the magnetic shoes as claimed in any one of claims 1 to 10.
13. A permanent magnet electrical machine, characterized in that it comprises a machine rotor according to claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110523859.0A CN113206565B (en) | 2021-05-13 | 2021-05-13 | Magnetic shoe for motor, motor rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110523859.0A CN113206565B (en) | 2021-05-13 | 2021-05-13 | Magnetic shoe for motor, motor rotor and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113206565A true CN113206565A (en) | 2021-08-03 |
| CN113206565B CN113206565B (en) | 2022-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114094750A (en) * | 2021-11-26 | 2022-02-25 | 南京埃斯顿自动化股份有限公司 | Bearing pre-tightening method for permanent magnet motor |
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| CN113206565B (en) | 2022-05-27 |
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