CN107370268A - P-m rotor and asynchronous starting permanent magnet synchronous motor with low loss of excitation risk - Google Patents
P-m rotor and asynchronous starting permanent magnet synchronous motor with low loss of excitation risk Download PDFInfo
- Publication number
- CN107370268A CN107370268A CN201710832462.3A CN201710832462A CN107370268A CN 107370268 A CN107370268 A CN 107370268A CN 201710832462 A CN201710832462 A CN 201710832462A CN 107370268 A CN107370268 A CN 107370268A
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- Prior art keywords
- permanent magnet
- rotor
- low loss
- stator
- excitation
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Classifications
-
- 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
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a kind of p-m rotor and asynchronous starting permanent magnet synchronous motor with low loss of excitation risk.Wherein, a kind of p-m rotor with low loss of excitation risk, it includes rotor core and permanent magnet, it is characterized in that, the cross sectional shape of the permanent magnet end is polygon, and axisymmetricly structure, symmetry axis are the center line perpendicular to permanent magnet magnetization direction to permanent magnet whole cross section.It can improve the anti-demagnetization capability of permanent magnet in asynchronous starting permanent magnet synchronous motor on the premise of motor performance is kept.
Description
Technical field
The invention belongs to engine art, more particularly to a kind of p-m rotor and asynchronous starting with low loss of excitation risk are forever
Magnetic-synchro motor.
Background technology
In structure, asynchronous starting permanent magnet synchronous motor can be regarded as inside the rotor core of conventional asynchronous motor
It placed permanent magnet.Motor realizes self-starting by induction torque caused by the cage modle winding of rotor outer surface, and motor is with synchronization
During fast stable operation, cage modle winding no longer works, and motor is by the interaction between stator field and rotor permanent magnet magnetic field
And run.Compared with conventional asynchronous motor, asynchronous starting permanent magnet synchronous motor has efficiency high, power factor high and economy
Outstanding advantages of range of operation is wide.
Similar to other kinds of magneto, the permanent magnet loss of excitation in asynchronous starting permanent magnet synchronous motor will be serious
Influence the runnability of motor.The loss of excitation risk for how reducing asynchronous starting permanent magnet synchronous motor will be helpful to further promote
The popularization and application of such motor, improve energy utilization rate.
The content of the invention
In order to solve the deficiencies in the prior art, the first object of the present invention is to provide a kind of permanent magnetism with low loss of excitation risk
Rotor, it can improve the anti-demagnetization of permanent magnet in asynchronous starting permanent magnet synchronous motor on the premise of motor performance is kept
Ability.
A kind of p-m rotor with low loss of excitation risk that the first object of the present invention provides, it includes rotor core and forever
Magnet, the cross sectional shape of the permanent magnet end is polygon, and axisymmetricly structure, symmetry axis are vertical to permanent magnet whole cross section
Directly in the center line in permanent magnet magnetization direction.
Further, the polygon is isosceles trapezoid.
Further, when polygon is isosceles trapezoid, the waist of isosceles trapezoid is a length ofPermanent magnet end again is along forever
Magnet magnetized direction width.
The cross sectional shape of the permanent magnet end of the present invention is polygon, has pruned the corner that permanent magnet easily demagnetizes, this
Sample permanent magnet causes end corner areas is not present, can effectively reduce the distortion degree of the permanent magnet end magnetic line of force, improve forever
The minimum operating point in magnet ends region, reduce the probability that permanent magnet demagnetizes, improve the anti-demagnetization capability of permanent magnet.
The waist of isosceles trapezoid is a length ofTimes permanent magnet end along permanent magnet magnetization direction width, its main purpose be for
Prune the corner that permanent magnet easily demagnetizes, while also allow for the processing of permanent magnet., can be with addition, for different motors
The value grown according to the concrete structure parameter of motor using FInite Element to the waist of isosceles trapezoid optimizes calculating analysis, obtains
The value grown suitable for the waist of the most strong isosceles trapezoid of the anti-demagnetization capability of particular motor.
It should be noted that the polygon of the cross sectional shape of permanent magnet end can also be two in addition to isosceles trapezoid
The parallel hexagon in individual base.
Further, there are multiple rotor slots the outer surface of the rotor core.
Further, at least one permanent magnet trough that is internally provided with of the rotor core, set in each permanent magnet trough
It is equipped with one or more permanent magnets.
Further, the size of permanent magnet and the size of permanent magnet trough match.
Further, when in the rotor core, when being internally provided with multiple permanent magnet troughs, permanent magnet trough is in " W " shape cloth
Put.
It should be noted that when when being internally provided with multiple permanent magnet troughs, can also being in other in the rotor core
Diversified forms are arranged.
Further, cylindrical shape is presented in the rotor core, and the silicon steel sheet placed by multiple stackings is process.
The second object of the present invention is to provide a kind of asynchronous starting permanent magnet synchronous motor.
A kind of asynchronous starting permanent magnet synchronous motor that the second object of the present invention provides, including：
Stator, and
P-m rotor described above, the p-m rotor can be rotatably set in the stator, and with the stator
It is spaced a distance.
Further, the stator includes columnar stator core, multiple radial directions along the stator are inwardly prolonged
The stator tooth stretched, the stator slot being distributed between the multiple stator tooth and the winding stator tooth are to produce rotating excitation field
Coil.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) in asynchronous starting permanent magnet synchronous motor, permanent magnet is located inside rotor core, in the work of strong demagnetized field
Under, if the cross sectional shape of permanent magnet is traditional rectangle, irreversible demagnetization easily occurs for the corner areas of permanent magnet.And
And in the presence of strong demagnetized field, the demagnetization region will further expand.The shape of permanent magnet end cross-sectional is adopted in the present invention
With polygon, the probability that irreversible demagnetization occurs for permanent magnet end is effectively reduced, it is synchronously electronic to improve asynchronous starting and permanent magnet
The stability of machine operation.
(2) shape of the invention by changing asynchronous starting permanent magnet synchronous motor rotor core interior permanent magnets, effectively
Improve the anti-demagnetization capability of such motor, be advantageous to the stable operation of such motor, the motor of the invention be easily achieved and
Significant effect；And the present invention only changes the shape of permanent magnet end, the other structures parameter of motor does not change, to motor
Very little is influenceed caused by performance.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is the rotor structure schematic diagram with traditional rectangular permanent magnet；
Fig. 2 is the distribution diagram of magnetic line of force of the motor internal with traditional rectangular PM rotor；
Fig. 3 is a kind of permanent magnet rotor structure schematic diagram with low loss of excitation risk of the present invention；
Fig. 4 is that the end cross-sectional of the present invention is shaped as the permanent magnet schematic diagram of polygon；
Fig. 5 is traditional rectangular permanent magnet figure compared with the change curve of the minimum operating point of permanent magnet of the present invention.
Wherein, 1- rotor cores, 2- permanent magnets, 3- rotor slots, 4- permanent magnet troughs.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Fig. 1 is the rotor structure schematic diagram with traditional rectangular permanent magnet.
As shown in figure 1, the rotor with traditional rectangular permanent magnet includes：Rotor core 1, offer on rotor core 1 and turn
Pilot trench 3 and permanent magnet trough 4, permanent magnet 2 is provided with permanent magnet trough 4.Wherein, the rectangular cross-section of permanent magnet 2.
When the rotating speed of asynchronous starting permanent magnet synchronous motor is fixed as close to the steady state value of synchronous speed, using traditional rectangular
During the permanent magnet of cross sectional shape, when occurring in the most serious demagnetization operating point of motor, the distribution diagram of magnetic line of force of motor internal, such as scheme
Shown in 2.
From figure 2 it can be seen that the magnetic line of force distribution in most of region (region among permanent magnet) of permanent magnet
Uniformly, and the direction of magnetization with permanent magnet is consistent, illustrate the permanent magnet each point in this region the close size of magnetic and
Direction is consistent, and the probability very little demagnetized；And in the end of permanent magnet, there is distortion in the magnetic line of force, and direction is not
Consistent with the direction of magnetization of permanent magnet again, permanent magnet is deviateed in the corner location particularly in permanent magnet end, the direction of the magnetic line of force
The direction of magnetization it is more, the operating point of each point is relatively low in these regions, is easier to demagnetize.
In summary, when using traditional square-section permanent magnet, in the corner areas of permanent magnet end, permanent magnet
The operating point of each point is relatively low, and during the close value of the flex point magnetic on less than permanent-magnet material magnetization curve, irreversible demagnetization will occur；
During using traditional square-section permanent magnet, in the presence of strong demagnetized field, the corner areas of permanent magnet is easily sent out
Raw irreversible demagnetization, and in the presence of demagnetized field, the area in irreversible demagnetization region will further expand, and cause motor
Hydraulic performance decline.
Therefore, in order to improve the anti-demagnetization capability of asynchronous starting permanent magnet synchronous motor, have the invention provides one kind low
The p-m rotor of loss of excitation risk.
As shown in figure 3, a kind of p-m rotor with low loss of excitation risk of the present invention, it includes rotor core 1 and permanent magnetism
Body 2, the cross sectional shape of the end of permanent magnet 2 is polygon, and axisymmetricly structure, symmetry axis are the whole cross section of permanent magnet 2
Center line perpendicular to permanent magnet magnetization direction.
Wherein, there are multiple rotor slots 3 outer surface of the rotor core 1.
In specific implementation process, at least one permanent magnet trough 4, Mei Geyong is internally provided with the rotor core 1
One or more permanent magnets 2 are provided with magnet slot 4.
In specific implementation process, the size of the size and permanent magnet trough 4 of permanent magnet 2 matches.
When in the rotor core, when being internally provided with multiple permanent magnet troughs, permanent magnet trough is arranged in " W " shape.
It should be noted that when when being internally provided with multiple permanent magnet troughs, can also being in other in the rotor core
Diversified forms are arranged.
Wherein, cylindrical shape is presented in the rotor core 1, and the silicon steel sheet placed by multiple stackings is process.
As shown in figure 4, so that the cross sectional shape of permanent magnet end is isosceles trapezoid as an example：
hmThickness of-the permanent magnet along the direction of magnetization, l1- Fig. 4 midpoints a1~a4The distance between permanent magnet end, l2- Fig. 4
Midpoint b1~b4The distance between upper (lower) surface of permanent magnet.
Wherein, point a1~a4The distance between permanent magnet end l1=hm/ 3, and b1~b4With the upper (lower) table of permanent magnet
The distance between face l2=hm/3。
Now, the waist of isosceles trapezoid is a length ofTimes permanent magnet end along permanent magnet magnetization direction width.
The cross sectional shape of the permanent magnet end of the present invention is polygon, has pruned the corner that permanent magnet easily demagnetizes, this
Sample permanent magnet causes end corner areas is not present, can effectively reduce the distortion degree of the permanent magnet end magnetic line of force, improve forever
The minimum operating point in magnet ends region, reduce the probability that permanent magnet demagnetizes, improve the anti-demagnetization capability of permanent magnet.
The waist of isosceles trapezoid is a length ofTimes permanent magnet end along permanent magnet magnetization direction width, its main purpose be for
Prune the corner that permanent magnet easily demagnetizes, while also allow for the processing of permanent magnet., can be with addition, for different motors
According to the concrete structure parameter of motor using FInite Element to l1And l2Value optimize calculating analysis, obtain be applied to spy
Determine the most strong l of the anti-demagnetization capability of motor1And l2Value.
It should be noted that the polygon of the cross sectional shape of permanent magnet end can also be two in addition to isosceles trapezoid
The parallel hexagon in individual base.
Specifically, for different motors, FInite Element can be utilized according to the concrete structure parameter of motor to polygon
Each length of side value optimize calculating analysis, obtain the value of the most strong length of side of anti-demagnetization capability suitable for particular motor.
End corner areas is not present in the permanent magnet end of the present invention, can effectively reduce the permanent magnet end magnetic line of force
Distortion degree, the minimum operating point of permanent magnetism end region is improved, reduce the probability that permanent magnet demagnetizes, improve permanent magnet
Anti- demagnetization capability.
When Fig. 5 is that the rotating speed of certain asynchronous starting permanent magnet synchronous motor is fixed as close to the steady state value of synchronous speed, respectively
The change curve of permanent magnet minimum operating point when being shaped as the permanent magnet of polygon using traditional rectangular permanent magnet and end cross-sectional,
The curve indicates the minimum value of each point operating point on each moment whole permanent magnet.It is synchronously electronic for asynchronous starting and permanent magnet
Machine, when electric motor starting to rotating speed is close to synchronous speed, the demagnetized field maximum intensity in motor, therefore can using the computational methods
With obtain the most serious of motor demagnetization operating point (when under the effect of most strong demagnetized field, each point operating point on whole permanent magnets
Minimum value), i.e., the minimum value of homologous thread in figure.
From figure 5 it can be seen that the most serious of motor demagnetizes operating point for -1.18T when using square-section permanent magnet,
When using end cross-sectional to be shaped as the permanent magnet of polygon, the most serious of motor demagnetizes operating point for -0.33T；Cut using end
Most serious demagnetization operating point ratio when face is shaped as the permanent magnet of polygon is much higher when using square-section permanent magnet.Therefore,
When the permanent magnet of polygon is shaped as using end cross-sectional, the risk of permanent magnet loss of excitation substantially reduces, the reliability of motor operation
It will effectively improve.
What the present invention changed is only the end shape of permanent magnet and when being changed to permanent magnetism shape, be perpendicular to
Carried out on the section of motor axial direction.The effect that the application makees to change is：Change permanent magnet cutting perpendicular to motor axial direction
Face shape, the shape of permanent magnet vertically is consistent；And the shape of permanent magnet end is only changed, to the shadow of motor performance
Sound is smaller.
Based on p-m rotor as shown in Figure 3, present invention also offers a kind of asynchronous starting permanent magnet synchronous motor.
A kind of asynchronous starting permanent magnet synchronous motor of the present invention, including：
Stator, and
P-m rotor as shown in Figure 3, the p-m rotor can be rotatably set in the stator, and with the stator
It is spaced a distance.
Wherein, the stator includes columnar stator core, multiple radial directions along the stator extend internally
Stator tooth, the stator slot being distributed between the multiple stator tooth and the winding stator tooth are to produce the line of rotating excitation field
Circle.
A kind of operation principle of asynchronous starting permanent magnet synchronous motor of the present invention is：
In asynchronous starting permanent magnet synchronous motor, permanent magnet is located inside rotor core, in the effect of strong demagnetized field
Under, if the cross sectional shape of permanent magnet is traditional rectangle, irreversible demagnetization easily occurs for the corner areas of permanent magnet.Also,
In the presence of strong demagnetized field, the demagnetization region will further expand.The shape of permanent magnet end cross-sectional uses in the present invention
Polygon, the probability that irreversible demagnetization occurs for permanent magnet end is effectively reduced, improves asynchronous starting permanent magnet synchronous motor
The stability of operation.
Shape of the invention by changing asynchronous starting permanent magnet synchronous motor rotor core interior permanent magnets, effectively improve
The anti-demagnetization capability of such motor, is advantageous to the stable operation of such motor, the motor of the invention is easily achieved and effect
Significantly；And the present invention only changes the shape of permanent magnet end, the other structures parameter of motor does not change, to motor performance
Caused influence very little.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, model not is protected to the present invention
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deformation that creative work can make still within protection scope of the present invention.
Claims (10)
1. a kind of p-m rotor with low loss of excitation risk, it includes rotor core and permanent magnet, it is characterised in that the permanent magnetism
The cross sectional shape in body end portion is polygon, and axisymmetricly structure, symmetry axis are perpendicular to permanent magnet magnetic to permanent magnet whole cross section
Change the center line in direction.
2. a kind of p-m rotor with low loss of excitation risk as claimed in claim 1, it is characterised in that the polygon is etc.
Waist is trapezoidal.
3. a kind of p-m rotor with low loss of excitation risk as claimed in claim 2, it is characterised in that when polygon is isosceles
When trapezoidal, the waist of isosceles trapezoid is a length ofTimes permanent magnet end along permanent magnet magnetization direction width.
A kind of 4. p-m rotor with low loss of excitation risk as claimed in claim 1 or 2, it is characterised in that the rotor iron
There are multiple rotor slots the outer surface of core.
5. a kind of p-m rotor with low loss of excitation risk as claimed in claim 1 or 2, it is characterised in that in the rotor
Iron core is internally provided with least one permanent magnet trough, and one or more permanent magnets are provided with each permanent magnet trough.
A kind of 6. p-m rotor with low loss of excitation risk as claimed in claim 5, it is characterised in that the size of permanent magnet and
The size of permanent magnet trough matches.
7. a kind of p-m rotor with low loss of excitation risk as claimed in claim 5, it is characterised in that when in the rotor iron
When being internally provided with multiple permanent magnet troughs of core, permanent magnet trough are arranged in " W " shape.
8. a kind of p-m rotor with low loss of excitation risk as claimed in claim 1, it is characterised in that the rotor core is in
Existing cylindrical shape, and the silicon steel sheet placed by multiple stackings is process.
A kind of 9. asynchronous starting permanent magnet synchronous motor, it is characterised in that including：
Stator, and
The p-m rotor with low loss of excitation risk as any one of claim 1-8, the p-m rotor is rotatably
It is arranged in the stator, and a distance is opened with the sub-interval.
10. asynchronous starting permanent magnet synchronous motor as claimed in claim 9, it is characterised in that the stator includes cylindrical shape
Stator core, multiple radial directions along the stator extend internally stator tooth, be distributed between the multiple stator tooth
Stator slot and the winding stator tooth to produce the coil of rotating excitation field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710832462.3A CN107370268A (en) | 2017-09-15 | 2017-09-15 | P-m rotor and asynchronous starting permanent magnet synchronous motor with low loss of excitation risk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710832462.3A CN107370268A (en) | 2017-09-15 | 2017-09-15 | P-m rotor and asynchronous starting permanent magnet synchronous motor with low loss of excitation risk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107370268A true CN107370268A (en) | 2017-11-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710832462.3A Pending CN107370268A (en) | 2017-09-15 | 2017-09-15 | P-m rotor and asynchronous starting permanent magnet synchronous motor with low loss of excitation risk |
Country Status (1)
| Country | Link |
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| CN (1) | CN107370268A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2609865A (en) * | 2021-12-31 | 2023-02-15 | Univ Jiangsu | High-performance permanent magnet motor with controllable magnetic field in variable operating conditions, and flux orientation design method and leakage flux |
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| JP2007060755A (en) * | 2005-08-23 | 2007-03-08 | Nissan Motor Co Ltd | Rotor structure for dynamo-electric machine |
| CN101699714A (en) * | 2009-10-30 | 2010-04-28 | 无锡新大力电机有限公司 | Built-in W-shaped installation and squirrel cage combining permanent magnet motor structure |
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2017
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|---|---|---|---|---|
| JPH02142333A (en) * | 1988-11-18 | 1990-05-31 | Tokyo Electric Co Ltd | Rotor for brushless motor |
| JPH08205436A (en) * | 1995-01-20 | 1996-08-09 | Matsushita Electric Ind Co Ltd | Motor |
| CN1198852A (en) * | 1995-10-04 | 1998-11-11 | 巴西船用压缩机有限公司 | Rotor with permanent magnets for an electric motor |
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| JP2007060755A (en) * | 2005-08-23 | 2007-03-08 | Nissan Motor Co Ltd | Rotor structure for dynamo-electric machine |
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| CN206364619U (en) * | 2016-11-21 | 2017-07-28 | 福州万德电气有限公司 | The new type rotor structure of magneto |
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Non-Patent Citations (1)
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| 唐旭，王秀和，李莹: "三相不对称供电异步起动永磁同步电动机的退磁研究", 《中国电机工程学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2609865A (en) * | 2021-12-31 | 2023-02-15 | Univ Jiangsu | High-performance permanent magnet motor with controllable magnetic field in variable operating conditions, and flux orientation design method and leakage flux |
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Application publication date: 20171121 |
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