CN106972663B - High-torque permanent magnet motor - Google Patents
High-torque permanent magnet motor Download PDFInfo
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- CN106972663B CN106972663B CN201710217793.6A CN201710217793A CN106972663B CN 106972663 B CN106972663 B CN 106972663B CN 201710217793 A CN201710217793 A CN 201710217793A CN 106972663 B CN106972663 B CN 106972663B
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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
- 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
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention provides a high-torque permanent magnet motor, wherein N double-layer magnetic steel clamping grooves are distributed on the circumference of a rotor, and each double-layer magnetic steel clamping groove is formed by matching an inner-layer magnetic steel clamping groove with an outer-layer magnetic steel clamping groove corresponding to the inner-layer magnetic steel clamping groove; the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves are respectively provided with an open end and a closed end, the inner magnetic steel clamping grooves are semi-wrapped in the outer magnetic steel clamping grooves, a magnetic circuit channel is arranged between the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves, and the open ends of the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves face the stator; a magnet steel group is respectively arranged in the inner magnet steel clamping groove and the outer magnet steel clamping groove, and a placing gap is arranged between adjacent magnet steels. Because more magnetic steels are arranged in the magnetic steel clamping groove, the torque of the motor is improved under the condition of not changing the volume of the motor, the service life of the motor is prolonged, and the magnetic flux of each pole of the rotor is more effectively increased, so that the air gap density and the power density of the motor are effectively improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a high-torque permanent magnet motor, and specifically relates to a permanent magnet motor adopting a multilayer superposition magnetic steel rotor structure.
Background
The permanent magnet motor has the advantages of small volume, light weight, high efficiency, high power density, high torque, convenient control and the like, and can be applied to the driving motor of the electric automobile.
At present, most permanent magnet motors use a single-layer laminated magnetic steel rotor, and the magnetic steel clamping groove is of a V-shaped structure. The V-shaped magnetic circuit structure results in a smaller magnetic flux per pole of the rotor, thereby resulting in a lower air gap flux density and power density of the motor, and on the other hand results in a lower structural strength of the rotor laminations, thereby resulting in a lower structural strength of the motor. In order to improve the torque of a permanent magnet motor with single-layer V-shaped laminated magnetic steel, the conventional method is to increase the size of the motor, so that the space of a V-shaped magnetic steel clamping groove is increased. Therefore, more magnetic steel can be installed in the V-shaped magnetic steel clamping groove to achieve the purpose of increasing torque. However, the method not only greatly increases the volume and weight of the motor, but also can cause concave side surfaces of the magnetic steel clamping grooves when the single-layer V-shaped laminated magnetic steel permanent magnet motor runs, thereby affecting the magnetic circuit circulation of the magnetic steel and reducing the efficiency of the motor. And as the concave degree of the magnetic steel clamping groove deepens, damage to the rotor is aggravated, and the scrapping speed of the motor is accelerated. Therefore, the single-layer V-shaped laminated magnetic steel permanent magnet motor has low torque, and the existing solution not only can increase the volume and the weight, but also reduces the efficiency and the reliability of the motor.
Based on the above, it is necessary to invent a new permanent magnet motor to solve the problems of low operation reliability, limited capacity expansion, low air gap density, low power density and low structural strength of the existing permanent magnet motor.
Disclosure of Invention
The invention aims to provide a high-torque permanent magnet motor, which aims to remarkably improve the torque of the motor through improvement of a rotor of an internal part of the motor and arrangement of multiple layers of magnetic steel.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a high torque permanent magnet motor comprising a stator and a rotor, characterized in that: n double-layer magnetic steel clamping grooves are distributed along the circumference of the rotor, and each double-layer magnetic steel clamping groove is formed by matching an inner-layer magnetic steel clamping groove with an outer-layer magnetic steel clamping groove corresponding to the inner-layer magnetic steel clamping groove;
the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves are respectively provided with an open end and a closed end, the inner magnetic steel clamping grooves are semi-wrapped in the outer magnetic steel clamping grooves, a magnetic circuit channel is arranged between the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves, and the open ends of the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves face the stator;
a magnet steel group is respectively arranged in the inner magnet steel clamping groove and the outer magnet steel clamping groove, and a placing gap is arranged between adjacent magnet steels; n is a positive even number;
the outer magnetic steel clamping groove consists of an outer central clamping groove and an outer side clamping groove, wherein the outer side clamping groove is arranged at the end part of the outer central clamping groove, and an included angle is formed between the outer side clamping groove and the outer central clamping groove;
the inner layer magnetic steel clamping groove is composed of an inner layer center clamping groove and an inner layer side clamping groove, wherein the inner layer side clamping groove is arranged at the end part of the inner side center clamping groove, and an included angle is formed between the inner layer side clamping groove and the inner layer center clamping groove.
Further, an outer magnetic steel group is arranged in the outer magnetic steel clamping groove, an inner magnetic steel group is arranged in the inner magnetic steel clamping groove, and the number of the magnetic steels of the outer magnetic steel group is the same as that of the inner magnetic steel group.
Preferably, two ends of the outer layer center clamping groove are respectively provided with outer layer side clamping grooves which are symmetrically arranged, the outer layer side clamping grooves are connected with the outer side center clamping groove through arc-shaped connecting parts, and the included angle between the outer layer side clamping grooves and the outer layer center clamping groove ranges from 95 degrees to 145 degrees; the two ends of the inner side central clamping groove are respectively provided with an inner side edge clamping groove, the inner side edge clamping grooves are connected with the inner side central clamping groove through arc-shaped connecting parts, and the included angle between the inner side edge clamping grooves and the inner side central clamping groove ranges from 95 degrees to 145 degrees.
Further, the outer layer center clamping groove is a straight line clamping groove, and an outer layer magnetic circuit channel penetrating through the straight line clamping groove is arranged at the center of the outer layer straight line clamping groove; correspondingly, the inner layer center clamping groove is an inner layer straight line clamping groove, and an inner layer magnetic circuit channel penetrating through the straight line clamping groove is arranged at the center of the inner layer straight line clamping groove, wherein the outer layer center clamping groove and the inner layer center clamping groove are parallel to each other, and the outer layer magnetic circuit channel is larger than or equal to the inner layer magnetic circuit channel.
Further, a group of first magnetism blocking grooves are symmetrically arranged at the center of the outer layer center clamping groove, an outer layer magnetic circuit channel is arranged between the group of first magnetism blocking grooves, one end of each first magnetism blocking groove is communicated with the outer layer center clamping groove, the distance between the upper side end and the lower side end of each first magnetism blocking groove is larger than the distance between the two side walls of the outer layer center clamping groove, the upper side end and the lower side end of each first magnetism blocking groove are arc-shaped bulges, and the arc-shaped bulges are connected with the side walls of the outer layer center clamping groove through first steps; one end of the outer-layer side clamping groove is connected with an arc-shaped connecting part through a second step, and the other end of the arc-shaped connecting part is connected with the outer-side central clamping groove through a boss; the other end of outer side draw-in groove is equipped with the second and keeps off the magnetism groove, the distance between the both sides wall of second fender magnetism groove is greater than the distance between the both sides wall of outer side draw-in groove, and the both sides end of second fender magnetism groove is circular-arc protruding, links to each other through the third step between the lateral wall of this circular-arc protruding and outer side draw-in groove.
Still further, the center department of inlayer center draw-in groove is equipped with the third that a set of symmetry set up and keeps off the magnetic groove, this set of third keep off and be equipped with inlayer magnetic circuit passageway between the magnetic groove, the one end and the inlayer center draw-in groove intercommunication that keep off the magnetic groove in third, the distance between the upper and lower both sides end of third keeps off the magnetic groove is greater than the both sides wall distance of inlayer center draw-in groove, the upper and lower side end of third keeps off the magnetic groove is circular-arc protruding, link to each other through the fourth step between the lateral wall of this circular-arc protruding and inlayer center draw-in groove.
In a more preferable scheme, in the double-layer magnetic steel clamping groove structure, four outer magnetic steel groups are respectively two outer rectangular magnetic steels and two second wedge-shaped magnetic steels, wherein the outer rectangular magnetic steels are arranged in the outer central clamping groove in parallel, and the two second wedge-shaped magnetic steels are respectively and symmetrically arranged in the outer side clamping grooves; the inner magnetic steel groups are four, namely two inner rectangular magnetic steels and two first wedge-shaped magnetic steels, wherein the inner rectangular magnetic steels are arranged in the inner central clamping groove in parallel, and the two first wedge-shaped magnetic steels are symmetrically arranged in the inner side clamping grooves respectively.
Still further, wherein the direction that first wedge magnet steel and second wedge magnet steel set up is opposite, first wedge magnet steel forward setting promptly, second wedge magnet steel reverse setting for the distribution of magnetic flux is more reasonable high-efficient, and when the motor was operated, the both sides of rotor double-deck magnet steel draw-in groove probably can the indent, and place the magnet steel in both sides because its wedge shape has the reaction force to the draw-in groove, can reduce the degree of draw-in groove indent, has reduced the possibility that motor rotor damaged so greatly, has improved the life-span of motor.
Compared with the prior art, the technical scheme of the invention comprises a plurality of improvements in detail besides the improvement of the whole technical scheme, and particularly has the following beneficial effects:
1. according to the improved scheme, a structure of multiple layers of laminated magnetic steel is additionally arranged at the rotor, the magnetic steel clamping grooves are fully utilized, more magnetic steel is arranged in the magnetic steel clamping grooves, and the torque of the motor is improved under the condition that the volume of the motor is not changed;
2. the multi-layer magnetic steel in the technical scheme is divided into the rectangular magnetic steel arranged in the magnetic steel center clamping groove and the wedge-shaped magnetic steel arranged in the side clamping groove, when the motor runs, two sides of the rotor double-layer magnetic steel clamping groove possibly sink inwards, and the magnetic steel arranged at two sides has a reaction force to the clamping groove due to the wedge-shaped shape, so that the degree of the sink inwards can be reduced, the possibility of damage to the motor rotor is greatly reduced, and the service life of the motor is prolonged;
3. the gap is formed between the adjacent magnetic steels, the gap is in a magnetic blocking groove structure or an arc-shaped connecting part, the gap has the effects of dividing the polarity of a magnetic field and reducing magnetic leakage, the arrangement of the gap improves the defects of magnetic leakage increase and magnetic flux reduction caused by embedded magnetic steels, the magnetic flux of each pole of the magnetic steels is not reduced, the effect of increasing the magnetic flux of each pole is also achieved, the distribution shape of the magnetic flux is more reasonable, no-load current is reduced, and the utilization rate of the magnetic steels is improved;
4. the magnetic steels of the double layers and even the multiple layers are interacted and matched, so that the magnetic flux of each pole of the rotor is effectively increased, and the air gap flux density and the power density of the motor are effectively improved;
5. the permanent magnet motor composed of the rotor and the stator with the special structure has the advantages of simple structure, convenient control and further increased power density. The motor is used on an electric automobile driving motor, so that the torque of the motor can be further improved, the weight and the volume of the motor are reduced, and the working stability of the motor is improved.
Drawings
Fig. 1 is a schematic cross-sectional view of a stator and rotor of a permanent magnet motor according to the present invention.
Fig. 2 is a diagram of a rotor core according to the present invention.
Fig. 3 is a drawing of a rotor core sheet according to the present invention.
Fig. 4 is an enlarged schematic view of a portion a of fig. 3.
Fig. 5 is an enlarged partial view of the rotor according to the present invention after the magnetic steel is placed.
Fig. 6 is a schematic perspective view of a first wedge-shaped magnetic steel according to the present invention.
Fig. 7 is a schematic perspective view of a second wedge-shaped magnetic steel of the present invention.
FIG. 8 is a diagram showing the relationship between the magnetic density width and the magnetic density amplitude generated by the double-layer magnetic steel of the present invention.
Reference numerals:
1 rotor, 2 stator, 3 first wedge-shaped magnetic steel, 4 second wedge-shaped magnetic steel, 5 inner layer rectangular magnetic steel and 6 outer layer rectangular magnetic steel;
7 outer layer magnetic steel clamping grooves, 8 inner layer magnetic steel clamping grooves, 9 open ends, 10 closed ends, 11 gaps, 12 inner layer magnetic circuit channels and 13 outer layer magnetic circuit channels;
71 outer layer center clamping grooves, 711 first magnetism blocking grooves, 712 first steps, 72 outer layer side clamping grooves, 721 second steps, 722 second magnetism blocking grooves, 723 third steps, 73 arc-shaped connecting parts and 74 bosses;
81 inner layer center clamping grooves, 82 inner layer side clamping grooves, 811 third magnetism blocking grooves and 812 fourth steps.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The present invention provides a high torque permanent magnet motor, referring to fig. 1, the motor comprises a stator and a rotor, and is characterized in that: n double-layer magnetic steel clamping grooves are distributed along the circumference of the rotor, and each double-layer magnetic steel clamping groove is formed by matching an inner-layer magnetic steel clamping groove with an outer-layer magnetic steel clamping groove corresponding to the inner-layer magnetic steel clamping groove;
the inner magnetic steel clamping groove and the outer magnetic steel clamping groove are respectively provided with an open end and a closed end, the inner magnetic steel clamping groove is semi-wrapped in the outer magnetic steel clamping groove, a magnetic circuit channel is arranged between the inner magnetic steel clamping groove and the outer magnetic steel clamping groove, the open ends of the inner magnetic steel clamping groove and the outer magnetic steel clamping groove face the stator, and further description is needed that the semi-wrapping means that the inner magnetic steel clamping groove is arranged at the open end of the outer magnetic steel clamping groove, and the magnetic steel arranged in the inner magnetic steel clamping groove is effectively matched with the magnetic steel arranged in the outer magnetic steel clamping groove;
the inner and outer magnetic steel clamping grooves are respectively provided with a magnetic steel group, and a placing gap is arranged between the adjacent magnetic steels, wherein the gap has the positive significance of dividing the polarity of a magnetic field and reducing magnetic leakage, and the gap improves the defects of magnetic leakage increase and magnetic flux reduction caused by the embedded magnetic steel. N is a positive even number;
preferably, the outer magnetic steel clamping groove is formed by an outer central clamping groove and an outer side clamping groove, wherein the outer side clamping groove is arranged at the end part of the outer central clamping groove, and an included angle is formed between the outer side clamping groove and the outer central clamping groove; the inner layer magnetic steel clamping groove is composed of an inner layer center clamping groove and an inner layer side clamping groove, wherein the inner layer side clamping groove is arranged at the end part of the inner side center clamping groove, and an included angle is formed between the inner layer side clamping groove and the inner layer center clamping groove.
Preferably, the outer magnetic steel clamping groove is internally provided with an outer magnetic steel group, the inner magnetic steel clamping groove is internally provided with an inner magnetic steel group, and the number of the magnetic steels of the outer magnetic steel group is the same as that of the inner magnetic steel group.
In one embodiment, the outer magnetic steel clamping groove is formed by an outer central clamping groove and an outer side clamping groove, wherein the outer side clamping groove is arranged at the end part of the outer central clamping groove, and an included angle is formed between the outer side clamping groove and the outer central clamping groove; the inner layer magnetic steel clamping groove is composed of an inner layer center clamping groove and an inner layer side clamping groove, wherein the inner layer side clamping groove is arranged at the end part of the inner side center clamping groove, and an included angle is formed between the inner layer side clamping groove and the inner layer center clamping groove. The connection between the side clamping groove and the central clamping groove means that the two clamping grooves are mutually communicated, the communication mode can be angle folding splicing or arc corner splicing, in a preferred embodiment, the communicated part comprises an arc connecting part, but special attention is required to be paid, the arc connecting part comprises an inner side edge and an outer side edge corresponding to the inner side edge, the inner side edge is provided with an angle folding, and the outer side edge is provided with a corner with arc.
Specifically, the modeling operation is also a better mode, namely two ends of an outer side central clamping groove are respectively provided with outer side clamping grooves which are symmetrically arranged, the two symmetrical outer side clamping grooves form an outwards-opened inverted-eight shape, the outer side clamping grooves are connected with the outer side central clamping groove through an arc line, and the included angle between the outer side clamping grooves and the outer side central clamping groove is 95-145 degrees; the two ends of the inner side center clamping groove are respectively provided with an inner side edge clamping groove which is symmetrically arranged, the two symmetrical inner side edge clamping grooves form an outwards-opened inverted-eight shape, the inner side edge clamping grooves are connected with the inner side center clamping groove in an arc way, and the included angle between the inner side edge clamping grooves and the inner side center clamping groove ranges from 95 degrees to 145 degrees. Specifically, a preferred angle range is 110-125 degrees.
The included angle between the inner layer side clamping groove and the inner layer center clamping groove is equal to or slightly smaller than the included angle between the outer layer side clamping groove and the outer layer side clamping groove. For example, in one embodiment, the included angle between the outer side clamping groove and the outer side central clamping groove is 110.5-115 degrees, and then the included angle between the inner side clamping groove and the inner side central clamping groove is 110-114.5 degrees, so that the magnetic flux of each pole of the rotor is effectively increased by the arrangement of the included angle, and therefore the air gap magnetic density and the power density of the motor are effectively improved.
In a specific embodiment, the outer layer central clamping groove is a linear clamping groove, and an outer layer magnetic circuit channel penetrating through the linear clamping groove is arranged at the center of the linear clamping groove; correspondingly, the inner layer center clamping groove is a straight line clamping groove, and an inner layer magnetic circuit channel penetrating through the straight line clamping groove is arranged at the center of the straight line clamping groove, wherein the outer layer center clamping groove and the inner layer center clamping groove are parallel to each other, and the outer layer magnetic circuit channel is larger than or equal to the inner layer magnetic circuit channel. The inner magnetic path channel and the outer magnetic path channel are arranged at the positions corresponding to each other and effectively act, and the inner magnetic path channel and the outer magnetic path channel are linear type channels, inverted splayed channels or the like) ("structural channels or arc-shaped channels and other structural forms. Specifically, the ratio of the widths of the inner layer magnetic path and the outer layer magnetic path is 1: 2-3, wherein the ratio of the widths that can achieve the best effect is 1:2.5- -2.8.
Further, a group of first magnetism blocking grooves are symmetrically arranged at the center of the outer layer center clamping groove, an outer layer magnetic circuit channel is arranged between the group of first magnetism blocking grooves, one end of each first magnetism blocking groove is communicated with the outer layer center clamping groove, the distance between the upper side end and the lower side end of each first magnetism blocking groove is larger than the distance between the two side walls of the outer layer center clamping groove, namely the upper side end and the lower side end of each first magnetism blocking groove are outwards protruded and arc-shaped, and the arc-shaped protrusions are connected with the side walls of the outer layer center clamping groove through first steps; one end of the outer-layer side clamping groove is connected with an arc-shaped connecting part through a second step, and the other end of the arc-shaped connecting part is connected with the outer-side central clamping groove through a boss; the other end of outer side draw-in groove is equipped with the second and keeps off the magnetism groove, the distance between the both sides wall of second fender magnetism groove is greater than the distance between the both sides wall of outer side draw-in groove, and the both sides end of second fender magnetism groove is circular-arc protruding, links to each other through the third step between the lateral wall of this circular-arc protruding and outer side draw-in groove. The special structure of the outer layer center clamping groove and the outer layer side clamping groove can enable specific magnetic resistance to be formed between the magnetic steels arranged in the special structure and two ends of the magnetic steel, the magnetic isolation effect is achieved, the magnetic circuit channel can be further optimized, and the advantages of the double-layer magnetic steel clamping groove are better reflected.
Further, the distance between the upper side end and the lower side end of the first magnetic blocking groove is larger than the distance between the left side wall and the right side wall of the second magnetic blocking groove, so that the arrangement has positive effects and significance, the defects of magnetic leakage increase and magnetic flux reduction caused by embedded magnetic steel are overcome, the magnetic flux of each pole of the magnetic steel is not reduced, the effect of increasing the magnetic flux of each pole is achieved, the distribution shape of the magnetic flux is more reasonable, no-load current is reduced, and the utilization rate of the magnetic steel is improved.
Specifically, a group of third magnetism blocking grooves which are symmetrically arranged are arranged at the center of the inner layer center clamping groove, an inner layer magnetic circuit channel is arranged between the group of third magnetism blocking grooves, one end of each third magnetism blocking groove is communicated with the inner layer center clamping groove, the distance between the upper side end and the lower side end of each third magnetism blocking groove is larger than the distance between the two side walls of the inner layer center clamping groove, the upper side end and the lower side end of each third magnetism blocking groove are arc-shaped protrusions, and the arc-shaped protrusions are connected with the side walls of the inner layer center clamping groove through fourth steps.
The outer magnetic steel groups are respectively two outer rectangular magnetic steels and two second wedge-shaped magnetic steels, wherein the outer rectangular magnetic steels are arranged in the outer central clamping groove in parallel, and the two second wedge-shaped magnetic steels are symmetrically arranged in the outer side clamping grooves respectively; the inner magnetic steel groups are four, namely two inner rectangular magnetic steels and two first wedge-shaped magnetic steels, wherein the inner rectangular magnetic steels are arranged in the inner central clamping groove in parallel, and the two first wedge-shaped magnetic steels are symmetrically arranged in the inner side clamping grooves respectively.
The choice of the width of the magnetic steel is particularly required, for example, in this embodiment, the width of the two outer rectangular magnetic steels is 18mm, and the ratio of the widths of the inner magnetic path channel to the outer magnetic path channel is 1: and 2.7, when the widths of the two magnetic steels reach the numerical value respectively, the effect of better weakening harmonic waves can be achieved, so that the waveform of the air-immersed magnetic flux density approximates to a sine wave. Because the main rotor harmonic wave affecting the motor performance has 5/7/11/13 subharmonic wave, wherein the single-layer magnetic steel can only weaken 5/7 or 11/13 subharmonic wave of the single-layer magnetic steel in a targeted way, and all harmonic waves cannot be weakened at the same time. The double-layer magnetic steel can weaken 5/7/11/13 subharmonic affecting the main performance of the motor, and can ensure that the motor has larger output torque and reluctance torque components.
Referring specifically to fig. 8, the magnetic density widths generated by the double-layer magnetic steel are respectively l 1 l 2 The height of the magnetic density step is h respectively 1 h 2 Polar distance is τ, abscissa is spatial position l, and ordinate is magnetic density amplitude B.
To achieve better attenuation of harmonics, the density width l 1 l 2 The following relation should be satisfied as much as possible.
The relation is satisfied for weakening the 5 th harmonic:
the weakening 7 th harmonic satisfies the relation:
attenuation 11 th harmonic satisfies the relation:
attenuation of the 13 th harmonic satisfies the relationship:
considering the influence of magnetic steel magnetic leakage, close saturation and reinforcing ribs, the actual width of each section of magnetic steel needs to be slightly compensated, and the width of the magnetic steel is corrected:
calculating the corrected magnetic steel width:
h in rib1 、h rib2 The width h of the inner magnetic circuit channel and the outer magnetic circuit channel bridge1 、h bridge2 The width of the first magnetic blocking groove and the third magnetic blocking groove is the width of the first magnetic blocking groove, and r is the radius of the rotor; Δx 1 、Δx 2 The difference value of the width and the arc length of the magnetic steel is changed along with the structural change of the motor; Δl 1 、Δl 2 、h 1 、h 2 The specific numerical value of the waveform (B) is required to be accurately calculated through a magnetic field, so that the waveform of the air-immersed magnetic compact approximates to a sine wave.
In another embodiment, the outer layer center clamping groove is an arc clamping groove, the arc clamping groove and the outer layer side clamping grooves on two sides form a U-shaped structure together, and an outer layer magnetic circuit channel penetrating through the arc clamping groove is arranged at the center of the arc clamping groove; correspondingly, the inner layer center clamping groove is an arc clamping groove, and an inner layer magnetic circuit channel penetrating through the arc clamping groove is arranged at the center of the arc clamping groove, wherein the outer layer center clamping groove and the inner layer center clamping groove are parallel to each other, and the outer layer magnetic circuit channel is larger than or equal to the inner layer magnetic circuit channel. The positions of the inner magnetic path channel and the outer magnetic path channel are mutually corresponding and produce effective action, the mutual correspondence refers to up-down correspondence, the correspondence can be direct correspondence communication, or can be correspondence communication after staggering a certain transverse distance, and the inner magnetic path channel and the outer magnetic path channel are linear type channels, inverted splayed channels or are in a right angle type (structural channels or arc-shaped channels and other structural forms).
In a specific embodiment, in the double-layer magnetic steel clamping groove structure, the total number of the outer magnetic steel groups is 4, namely 2 outer rectangular magnetic steels and 2 second wedge-shaped magnetic steels, wherein the outer rectangular magnetic steels are arranged in the outer central clamping groove in parallel, and the second wedge-shaped magnetic steels are symmetrically arranged in the outer side clamping grooves respectively; correspondingly, the inner magnetic steel groups are respectively 2 inner rectangular magnetic steels and 2 first wedge-shaped magnetic steels, wherein the inner rectangular magnetic steels are arranged in the inner central clamping groove in parallel, and the first wedge-shaped magnetic steels are respectively and symmetrically arranged in the inner side clamping grooves.
Still further, wherein the direction that first wedge magnet steel and second wedge magnet steel set up is opposite, first wedge magnet steel forward setting promptly, second wedge magnet steel reverse setting for the distribution of magnetic flux is more reasonable high-efficient, and when the motor was operated, the both sides of rotor double-deck magnet steel draw-in groove probably can the indent, and place the magnet steel in both sides because its wedge shape has the reaction force to the draw-in groove, can reduce the degree of draw-in groove indent, has reduced the possibility that motor rotor was destroyed so greatly, has improved the life-span of motor.
The above description of the specific embodiments of the present invention has been given by way of example only, and the present invention is not limited to the above described specific embodiments. Any equivalent modifications and substitutions for the present invention will occur to those skilled in the art, and are also within the scope of the present invention. Accordingly, equivalent changes and modifications are intended to be included within the scope of the present invention without departing from the spirit and scope thereof.
Claims (6)
1. A high torque permanent magnet motor comprising a stator and a rotor, characterized in that: n double-layer magnetic steel clamping grooves are distributed along the circumference of the rotor, and each double-layer magnetic steel clamping groove is formed by matching an inner-layer magnetic steel clamping groove with an outer-layer magnetic steel clamping groove corresponding to the inner-layer magnetic steel clamping groove; the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves are respectively provided with an open end and a closed end, the inner magnetic steel clamping grooves are semi-wrapped in the outer magnetic steel clamping grooves, a magnetic circuit channel is arranged between the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves, and the open ends of the inner magnetic steel clamping grooves and the outer magnetic steel clamping grooves face the stator; a magnet steel group is respectively arranged in the inner magnet steel clamping groove and the outer magnet steel clamping groove, and a placing gap is arranged between adjacent magnet steels; the outer magnetic steel clamping grooves are formed by outer central clamping grooves and outer side clamping grooves, wherein the outer side clamping grooves are arranged at the end parts of the outer central clamping grooves, and included angles are formed between the outer side clamping grooves and the outer central clamping grooves; the inner layer magnetic steel clamping groove consists of an inner layer center clamping groove and an inner layer side clamping groove, wherein the inner layer side clamping groove is arranged at the end part of the inner layer center clamping groove, and an included angle is formed between the inner layer side clamping groove and the inner layer center clamping groove; the two ends of the outer central clamping groove are respectively provided with outer side clamping grooves which are symmetrically arranged, the outer side clamping grooves are connected with the outer central clamping groove through arc-shaped connecting parts, and the included angle between the outer side clamping grooves and the outer central clamping groove is 110.5-115 degrees; the two ends of the inner side central clamping groove are respectively provided with an inner side clamping groove, the inner side clamping grooves are connected with the inner side central clamping groove through arc-shaped connecting parts, and the included angle between the inner side clamping grooves and the inner side central clamping groove is 110-114.5 degrees; the outer layer center clamping groove is a straight line clamping groove, and an outer layer magnetic circuit channel penetrating through the straight line clamping groove is arranged at the center of the straight line clamping groove of the outer layer center clamping groove; correspondingly, the inner-layer central clamping groove is an inner-layer straight clamping groove, and an inner-layer magnetic circuit channel penetrating through the straight clamping groove is arranged at the center of the inner-layer straight clamping groove, wherein the outer-layer central clamping groove and the inner-layer central clamping groove are parallel to each other, and the outer-layer magnetic circuit channel is more than or equal to the inner-layer magnetic circuit channel; the center of the outer layer center clamping groove is provided with a group of first magnetism blocking grooves which are symmetrically arranged, an outer layer magnetic circuit channel is arranged between the group of first magnetism blocking grooves, one end of each first magnetism blocking groove is communicated with the outer layer center clamping groove, the distance between the upper side end and the lower side end of each first magnetism blocking groove is larger than the distance between the two side walls of the outer layer center clamping groove, the upper side end and the lower side end of each first magnetism blocking groove are arc-shaped bulges, and the arc-shaped bulges are connected with the side walls of the outer layer center clamping groove through first steps; one end of the outer-layer side clamping groove is connected with an arc-shaped connecting part through a second step, and the other end of the arc-shaped connecting part is connected with the outer-side central clamping groove through a boss;
the other end of the outer layer side clamping groove is provided with a second magnetism blocking groove, the distance between two side walls of the second magnetism blocking groove is larger than the distance between two side walls of the outer layer side clamping groove, two side ends of the second magnetism blocking groove are arc-shaped bulges, and the arc-shaped bulges are connected with the side walls of the outer layer side clamping groove through third steps; the distance between the upper side end and the lower side end of the first magnetic blocking groove is larger than the distance between the left side wall and the right side wall of the second magnetic blocking groove.
2. A high torque permanent magnet motor according to claim 1 wherein: an outer magnetic steel group is arranged in the outer magnetic steel clamping groove, an inner magnetic steel group is arranged in the inner magnetic steel clamping groove, and the number of the magnetic steels of the outer magnetic steel group is the same as that of the inner magnetic steel group.
3. A high torque permanent magnet motor according to claim 1 wherein: the center department of inlayer center draw-in groove is equipped with the third that a set of symmetry set up and keeps off the magnetic groove, is equipped with inlayer magnetic circuit passageway between this third keeps off the magnetic groove, and the one end and the inlayer center draw-in groove intercommunication that keep off the magnetic groove in third keep off the magnetic groove, and the distance between the upper and lower both sides end is greater than the both sides wall distance of inlayer center draw-in groove in the third keeps off the magnetic groove, and the upper and lower side end that keeps off the magnetic groove in third is circular-arc protruding, links to each other through the fourth step between the lateral wall of this circular-arc protruding and inlayer center draw-in groove.
4. A high torque permanent magnet motor according to claim 1 wherein: in the double-layer magnetic steel clamping groove structure, four outer magnetic steel groups are respectively two outer rectangular magnetic steels and two second wedge-shaped magnetic steels, wherein the outer rectangular magnetic steels are arranged in the outer central clamping groove in parallel, and the two second wedge-shaped magnetic steels are symmetrically arranged in the outer side clamping grooves respectively;
the inner magnetic steel groups are four, namely two inner rectangular magnetic steels and two first wedge-shaped magnetic steels, wherein the inner rectangular magnetic steels are arranged in the inner central clamping groove in parallel, and the two first wedge-shaped magnetic steels are symmetrically arranged in the inner side clamping grooves respectively.
5. A high torque permanent magnet motor according to claim 1 wherein: and 8 double-layer magnetic steel clamping grooves are distributed along the circumference of the rotor.
6. A high torque permanent magnet motor according to claim 4 wherein: two outer rectangular magnetic steels of the outer magnetic steel group are arranged in parallel; the two inner rectangular magnetic steels of the inner magnetic steel group are arranged in parallel.
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| CN201710217793.6A CN106972663B (en) | 2017-04-01 | 2017-04-01 | High-torque permanent magnet motor |
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| CN201710217793.6A CN106972663B (en) | 2017-04-01 | 2017-04-01 | High-torque permanent magnet motor |
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| CN106972663B true CN106972663B (en) | 2023-09-01 |
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| CN110729830A (en) * | 2019-10-29 | 2020-01-24 | 宁波菲仕运动控制技术有限公司 | High-speed rotor punching sheet and rotor structure |
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| KR20050069055A (en) * | 2003-12-30 | 2005-07-05 | 현대자동차주식회사 | Rotor structure of multi-layer interior permanent magnet motor |
| US20120074801A1 (en) * | 2010-09-27 | 2012-03-29 | Kollmorgen Corporation | Magnetic Rotor Having Inset Bridges To Promote Cooling |
| CN207010383U (en) * | 2017-04-01 | 2018-02-13 | 上海英磁新能源科技有限公司 | A kind of high torque (HT) magneto |
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| CN201813289U (en) * | 2010-01-08 | 2011-04-27 | 李嘉琛 | Permanent magnet synchronous motor for vehicle |
| CN102223040A (en) * | 2010-04-14 | 2011-10-19 | 富士电机株式会社 | Permanent magnet type rotating motor |
| JP2014075905A (en) * | 2012-10-04 | 2014-04-24 | Suzuki Motor Corp | Ipm type electric rotary machine |
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