CN111478543A - Electric generator with low harmonic content for electric automobile - Google Patents
Electric generator with low harmonic content for electric automobile Download PDFInfo
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- CN111478543A CN111478543A CN202010451932.3A CN202010451932A CN111478543A CN 111478543 A CN111478543 A CN 111478543A CN 202010451932 A CN202010451932 A CN 202010451932A CN 111478543 A CN111478543 A CN 111478543A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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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
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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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- 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
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- Engineering & Computer Science (AREA)
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Abstract
The invention provides a motor generator with low harmonic content for an electric automobile, and belongs to the technical field of automobile motors. The method is characterized in that: the permanent magnet synchronous motor comprises a stator iron core, an excitation winding, an armature winding, a segmented rotor, a non-magnetic-conductive rotor iron core and a shaft; the inner side of the stator core is provided with 12 stator poles with equal width, the arc-shaped groove of the non-magnetic-conductive rotor is embedded with 8 block rotor cores capable of conducting magnetic, the excitation winding and the armature winding are both centralized short-moment windings, the excitation winding is wound on the upper alternate pole of the stator core, and the armature winding is wound on the stator pole between the two excitation windings. Cutting 1-4 parallel ︺ -shaped air gap barriers in the inner line of the segmented rotor core; and non-magnetic-conductive light material is filled in the air gap magnetic barrier. The technology of the invention is a short magnetic circuit motor, and the iron loss is small under the same magnetic density; the winding is short-moment winding, and the winding is not overlapped, thereby reducing the heating of the motor. And the air gap magnetic barriers on the block rotor can effectively reduce even harmonics of the back electromotive force of the motor and improve the stability of operation.
Description
Technical Field
The invention relates to a motor generator with low harmonic content for an electric automobile, and belongs to the technical field of automobile motors.
Background
Energy conservation and environmental protection are always pursued targets for automobiles. The problems of environment deterioration and energy shortage are increasingly highlighted in the current society, and the requirements of the whole society on energy conservation and environmental protection are promoting the development of new energy automobiles. Electric vehicles are becoming a major direction of development as representatives of new energy vehicles. The driving motor is one of the key technologies to be researched by the electric automobile. The research and development of the driving motor of the electric automobile have very important significance.
The motor generator can operate as both a motor and a generator. The drive motor for a motor vehicle should have both functions, and be able to supply power to the electrical consumers after starting or to recover braking energy after driving the motor vehicle.
At present, most of the starting generators used in automobiles at home and abroad adopt a permanent magnet structure. The invention patent with application publication number CN 107947462A: a starting generator is characterized in that a power generation assembly is arranged in a shell on a motor driving wheel, the power generation assembly comprises an excitation coil arranged on a fixed shaft and a permanent magnet arranged on the inner wall of the shell, the shell is arranged on the driving wheel, so that the permanent magnet rotates along with the driving wheel to cut magnetic lines of force to generate power, the rotor is fixed on the shell through the arrangement of an outer rotor and an inner stator, the shell plays a role in protection, the weight of the rotor is increased, the rotation inertia of the rotor is increased, and the starting energy consumption of the generator can be reduced under the condition of the same output power. Although the excitation loss is reduced, there is a disadvantage that the excitation magnetic field is not adjustable. However, the existing yield and storage of rare earth permanent magnets will gradually fail to meet the growing demand of future electric vehicles. Therefore, research and development of rare earth-free electric vehicle motors must be greatly advanced.
The invention patent No. 201510916866.1 discloses a short-end short-magnetic-circuit block-type switched reluctance motor and a control circuit thereof, wherein the motor comprises a motor stator and a rotor, the stator comprises a stator core and a winding, and the rotor comprises a rotor laminated core and a non-magnetic-conductive frame. In the running process of the motor, the power-on phase of the motor has at least two adjacent phases, and the magnetic field path in the motor consists of the adjacent two-phase stator teeth, a stator yoke part between the two-phase stator teeth, a rotor laminated iron core and an air gap. When the motor runs, two adjacent phases are simultaneously electrified and cut off, so that the air gap magnetic field width of the motor is increased, the output torque of the motor is increased, and the force density of the motor is increased. However, the applicant researches and discovers that the waveform of the block rotor motor with the even poles is not an ideal sine wave due to a large amount of even harmonics in the counter electromotive force, so that the control precision is reduced, the loss and the torque ripple are increased for the motor, and the power generation quality is reduced for the generator.
Based on the above, the invention provides the electrically excited block rotor motor which has the advantages of both the electrically excited motor and the block rotor motor and has low even harmonic content. 1-4 air gap barriers in the shape of ︺ are cut out from the inner wire of the segmented rotor core, and non-magnetic-conductive light materials are filled in the air gap barriers. The technology of the invention is a short magnetic circuit motor, and the iron loss is small under the same magnetic density; the winding is short-moment winding, and the winding is not overlapped, thereby reducing the heating of the motor. And the finite element analysis software can know that the block rotor with the air gap magnetic barrier can enable the air gap magnetic field of the motor to tend to be sinusoidal, namely the air gap magnetic barrier on the block rotor can effectively reduce even harmonics of the back electromotive force of the motor, and improve the running stability.
At present, the applicant does not search the technology related to the invention through domestic and foreign search.
Disclosure of Invention
In order to provide a motor generator with low harmonic content for an electric automobile, which has a short magnetic circuit structure, a short-moment armature winding and an excitation winding which are isolated from each other and effectively reduces even harmonics of an even-number pole block rotor motor, the invention adopts the following technical scheme:
including stator core, excitation winding, armature winding, piecemeal rotor core, non-magnetic rotor core and axle, its characterized in that:
12 stator poles with pole shoes in the same shape are uniformly distributed on the inner side of the stator core;
the rotor shaft is provided with a non-magnetic conductive rotor iron core, the non-magnetic conductive rotor iron core is provided with 8 circular arc grooves, and the circular arc grooves are internally embedded with block rotor iron cores formed by laminating silicon steel sheets;
cutting 1 to 4 parallel ︺ -shaped air gap magnetic barriers into the inner line of the block rotor core, wherein the air gap magnetic barriers are filled with non-magnetic light materials;
stator slots are arranged between every two adjacent stator poles, and arc lengths of notches of all the stator slots are equal; the length of an outer arc of the segmented rotor core is not more than the sum of the arc length of one stator pole and the arc lengths of the two stator slots; the length of an outer arc of the segmented rotor core is greater than the sum of the arc length of one stator pole and the arc length of one stator slot;
the excitation winding and the armature winding are both centralized short-moment windings; winding an excitation winding on every other stator pole on the stator iron core, winding armature windings on the other stator poles, and winding directions of adjacent excitation windings are opposite; adjacent armature windings are wound in opposite directions; the armature windings are divided into a-phase armature winding, a B-phase armature winding, and a C-phase armature winding according to a phase difference.
The motor generator with low harmonic content for the electric automobile is characterized in that:
the connection between the outer circular arc of the block rotor iron core and the upper end part of the air gap magnetic barrier is 1-2mm, so that the block rotor iron core is still an independent integral module.
The motor generator with low harmonic content for the electric automobile is characterized in that:
the thickness of each "︺" shaped air gap barrier is the same.
The motor generator with low harmonic content for the electric automobile is characterized in that:
the non-magnetic rotor core is axially provided with a hole, the two sides of the integral rotor are provided with non-magnetic disks, and the non-magnetic disks and the integral rotor are mutually riveted through rivets.
The invention has the following beneficial effects:
1. the motor stator has the advantages that each phase of magnetic circuit is relatively independent, and each winding is isolated from each other, so that fault propagation can be effectively prevented;
2. the structure adopted by the invention is provided with the electric excitation winding, so that the air gap magnetic field can be adjusted at any time, and meanwhile, the overmining rare earth resource is avoided;
3. the special stator and rotor structure can effectively reduce the total flux linkage length and reduce the iron loss;
the addition of the ︺ -shaped air gap magnetic barriers can change the iron core magnetic resistance of each part of the block rotor, so that the q-axis magnetic resistance is larger than the d-axis magnetic resistance, and the increase of the d-axis inductance also improves the magnetic resistance torque of the motor;
5. the ︺ -shaped air gap magnetic barrier is added on the motor structure, so that the problem that flux linkage and back electromotive force have even harmonic due to opposite directions of the same phase magnetic flux opposite to the stator poles can be weakened, the even harmonic in the back electromotive force is weakened by changing the air gap magnetic field in the arc direction of the original block rotor, the back electromotive force waveform of the motor is close to sine, and the harmonic and torque pulsation of the motor are reduced;
6. the winding is a short-moment winding, the end part is short, a large amount of copper materials can be saved, the heating of the generator can be reduced, and the efficiency of the generator is improved.
Drawings
FIG. 1 is a schematic diagram of a low harmonic content motor generator of an electric vehicle according to the present invention. Wherein: 1. stator core, 2, excitation winding, 3, armature winding, 4, segmented rotor, 5, air gap magnetic barrier, 6, non-magnetic-conductive rotor core, 7 and shaft.
FIG. 2 is a wiring diagram of a motor generator with low harmonic content for an electric vehicle according to the present invention. Wherein: 1-12 represent 12 poles, respectively, F, A, B and C represent the excitation winding and the a-phase armature winding, the B-phase armature winding and the C-phase armature winding, respectively.
FIG. 3 is an enlarged schematic view of a segmented rotor core of a low harmonic content motor generator of an electric vehicle according to the present invention.
FIG. 4 is a magnetic circuit diagram of a finite element analysis of a motor generator with low harmonic content for an electric vehicle according to the present invention.
FIG. 5 is a schematic diagram of the opposite potential harmonics of a low harmonic content motor-generator of an electric vehicle according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
FIG. 1 is a schematic view of a motor generator with low harmonic content for an electric vehicle according to the present invention.
The permanent magnet synchronous motor comprises a stator iron core, an excitation winding, an armature winding, a block rotor, an air gap magnetic barrier, a non-magnetic-conductive rotor iron core and a shaft;
12 stator poles with equal width are uniformly distributed on the inner side of the stator core;
the non-magnetic-conductive rotor core is positioned on the inner side of the stator core and fixed on the shaft, the non-magnetic-conductive rotor core is provided with 8 arc-shaped grooves, and the arc-shaped grooves are internally embedded with the partitioned rotor core formed by laminating silicon steel sheets; cutting 1-4 ︺ -shaped air gap magnetic barriers in the inner line of the block rotor core; non-magnetic-conductive light material is filled in the air gap magnetic barrier; in the embodiment, 2 air gap barriers in the shape of ︺ are cut;
stator slots are arranged between the two stator poles, and arc lengths of the notches of the stator slots are equal; the length of an outer arc of the segmented rotor core is not more than the sum of the arc length of one stator pole and the arc lengths of the two stator slots; the arc length of the segmented rotor core is greater than the sum of the arc length of one stator pole and the arc length of one stator slot.
FIG. 2 is a wiring diagram of a motor generator with low harmonic content for an electric vehicle according to the present invention. Wherein: 1-12 represent 12 poles, respectively, F, A, B and C represent the excitation winding and the a-phase armature winding, the B-phase armature winding and the C-phase armature winding, respectively. The excitation winding and the armature winding are both centralized short-moment windings; winding an excitation winding on every other stator pole on the stator iron core, winding armature windings on the other stator poles, and winding directions of adjacent excitation windings are opposite; adjacent armature windings are wound in opposite directions.
FIG. 3 is an enlarged schematic view of a segmented rotor core of a low harmonic content motor generator of an electric vehicle according to the present invention. 2 air gap barriers in the shape of ︺ are cut on the inner line of the segmented rotor core; and non-magnetic-conductive light material is filled in the air gap magnetic barrier. The connection between the outer circular arc of the block rotor iron core and the upper end part of the air gap magnetic barrier is 1-2mm, so that the block rotor iron core is still an independent integral module.
The thickness of each "︺" shaped air gap barrier is the same.
FIG. 4 is a magnetic circuit diagram of a finite element analysis of a motor generator with low harmonic content for an electric vehicle according to the present invention. When the center of the rotor pole faces to the middle position of the A-phase stator pole and the excitation pole, the A-phase flux linkage is maximum; when the rotor center is aligned with the field pole center, the a phase flux linkage is minimal. When the rotor rotates, the mutual inductance of the excitation winding and the A-phase armature winding is transformed.
FIG. 5 is a schematic diagram of the opposite potential harmonics of a low harmonic content motor-generator of an electric vehicle according to the present invention. It can be seen that the opposing potential of the segmented rotor machine with the "︺" shaped air gap flux barrier has even harmonics that are lower and close to zero.
The two sides of the rotor are fixed by rivets by non-magnetic-conductive discs, so that the motor is firm in structure.
The following is an explanation of the working principle of the motor generator with low harmonic content for the electric vehicle.
The motor generator with low harmonic content of the electric automobile drives the rotor to rotate through the rotation of the shaft, and the excitation winding generates a radial magnetic field. The excitation magnetic field on the stator iron core sub-iron core sequentially passes through a stator pole, an air gap, a segmented rotor iron core with an air gap magnetic barrier, the air gap, the other stator pole of the stator iron core, and a stator yoke part on the sub-iron core, and finally returns to the initial stator pole to form a closed magnetic circuit. When the rotor pole connects a phase stator pole and a rotor pole, the magnetic resistance of the armature winding on the phase stator pole is minimum, the magnetic linkage is maximum, and the mutual inductance of the phase armature winding and the excitation winding is also maximum. When the rotor pole makes a phase stator pole and the rotor pole not communicated, the magnetic resistance of the armature winding on the phase stator pole is maximum, and the magnetic linkage is minimum.
A phase winding of the electric automobile with low harmonic content and rising inductance of the motor generator is electrified with forward current, and the winding can generate positive torque; a positive current is applied to one phase winding of the inductor step-down, which can generate a negative torque. When the field magnetic field is applied, the rotor rotates, and the flux linkage of the armature winding changes, thereby inducing an electromotive force. The armature windings are externally connected with a single-phase full-bridge rectifier to output direct-current voltage. The motor generator winding with low harmonic content of the electric automobile is a short-moment winding, and the winding is not overlapped, so that the heating of the motor is reduced. And the air gap magnetic barriers on the block rotor can effectively reduce even harmonics of the back electromotive force of the motor and improve the stability of operation.
Claims (4)
1. The utility model provides a motor generator of electric automobile low harmonic content, includes stator core, excitation winding, armature winding, segmentation rotor core, non-magnetic rotor core and axle, its characterized in that:
12 stator poles with pole shoes in the same shape are uniformly distributed on the inner side of the stator core;
the rotor shaft is provided with a non-magnetic conductive rotor iron core, the non-magnetic conductive rotor iron core is provided with 8 circular arc grooves, and the circular arc grooves are internally embedded with block rotor iron cores formed by laminating silicon steel sheets;
cutting 1 to 4 parallel ︺ -shaped air gap magnetic barriers into the inner line of the block rotor core, wherein the air gap magnetic barriers are filled with non-magnetic light materials;
stator slots are arranged between every two adjacent stator poles, and arc lengths of notches of all the stator slots are equal; the length of an outer arc of the segmented rotor core is not more than the sum of the arc length of one stator pole and the arc lengths of the two stator slots; the length of an outer arc of the segmented rotor core is greater than the sum of the arc length of one stator pole and the arc length of one stator slot;
the excitation winding and the armature winding are both centralized short-moment windings; winding an excitation winding on every other stator pole on the stator iron core, winding armature windings on the other stator poles, and winding directions of adjacent excitation windings are opposite; adjacent armature windings are wound in opposite directions; the armature windings are divided into a-phase armature winding, a B-phase armature winding, and a C-phase armature winding according to a phase difference.
2. The electric vehicle low harmonic content motor-generator of claim 1, characterized by:
and a magnetic isolation bridge with the thickness of 1-2mm is connected between the outer circular arc of the segmented rotor core and the upper end part of the air gap magnetic barrier, and the segmented rotor core is welded to form an integral module.
3. The electric vehicle low harmonic content motor-generator of claim 1, characterized by:
the thickness of each "︺" shaped air gap barrier is the same.
4. The electric vehicle low harmonic content motor-generator of claim 1, characterized by:
the non-magnetic rotor core is axially provided with a hole, the two sides of the integral rotor are provided with non-magnetic disks, and the non-magnetic disks and the integral rotor are mutually riveted through rivets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010451932.3A CN111478543A (en) | 2020-05-26 | 2020-05-26 | Electric generator with low harmonic content for electric automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010451932.3A CN111478543A (en) | 2020-05-26 | 2020-05-26 | Electric generator with low harmonic content for electric automobile |
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| CN111478543A true CN111478543A (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010451932.3A Pending CN111478543A (en) | 2020-05-26 | 2020-05-26 | Electric generator with low harmonic content for electric automobile |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6495941B1 (en) * | 2000-05-18 | 2002-12-17 | Mitsubishi Denki Kabushiki Kaisha | Dynamo-electric machine |
| CN102185451A (en) * | 2011-04-19 | 2011-09-14 | 南京航空航天大学 | Segmented rotor type magnetic flux switching motor with hybrid excitation and magnetic adjustment method |
| CN103683771A (en) * | 2013-12-05 | 2014-03-26 | 东南大学 | Like pole type inductor motor hiding salient pole |
| CN107070154A (en) * | 2017-05-10 | 2017-08-18 | 山东理工大学 | The phase magneto of extended-range electric vehicle five |
| CN109193992A (en) * | 2018-11-26 | 2019-01-11 | 史政齐 | The modularized motor of the high copper factor winding of the pre- coiling of electric car |
| CN109245353A (en) * | 2018-11-26 | 2019-01-18 | 史政齐 | The short magnetic circuit of electric car is without rare-earth permanent-magnet electric machine |
| CN109412282A (en) * | 2018-10-31 | 2019-03-01 | 山东理工大学 | A kind of multiphase fault-tolerant magneto |
| CN110957832A (en) * | 2019-12-09 | 2020-04-03 | 山东唐骏欧铃汽车制造有限公司 | Automobile engine driven permanent magnet generator |
-
2020
- 2020-05-26 CN CN202010451932.3A patent/CN111478543A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6495941B1 (en) * | 2000-05-18 | 2002-12-17 | Mitsubishi Denki Kabushiki Kaisha | Dynamo-electric machine |
| CN102185451A (en) * | 2011-04-19 | 2011-09-14 | 南京航空航天大学 | Segmented rotor type magnetic flux switching motor with hybrid excitation and magnetic adjustment method |
| CN103683771A (en) * | 2013-12-05 | 2014-03-26 | 东南大学 | Like pole type inductor motor hiding salient pole |
| CN107070154A (en) * | 2017-05-10 | 2017-08-18 | 山东理工大学 | The phase magneto of extended-range electric vehicle five |
| CN109412282A (en) * | 2018-10-31 | 2019-03-01 | 山东理工大学 | A kind of multiphase fault-tolerant magneto |
| CN109193992A (en) * | 2018-11-26 | 2019-01-11 | 史政齐 | The modularized motor of the high copper factor winding of the pre- coiling of electric car |
| CN109245353A (en) * | 2018-11-26 | 2019-01-18 | 史政齐 | The short magnetic circuit of electric car is without rare-earth permanent-magnet electric machine |
| CN110957832A (en) * | 2019-12-09 | 2020-04-03 | 山东唐骏欧铃汽车制造有限公司 | Automobile engine driven permanent magnet generator |
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Application publication date: 20200731 |
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