CN104753212A - Hybrid magnetic steel rotor and permanent magnet synchronous motor provided with rotor - Google Patents
Hybrid magnetic steel rotor and permanent magnet synchronous motor provided with rotor Download PDFInfo
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- CN104753212A CN104753212A CN201310726725.4A CN201310726725A CN104753212A CN 104753212 A CN104753212 A CN 104753212A CN 201310726725 A CN201310726725 A CN 201310726725A CN 104753212 A CN104753212 A CN 104753212A
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Abstract
The invention discloses a hybrid magnetic steel rotor and a permanent magnet synchronous motor provided with the rotor. Magnetic steel of the rotor is formed by two parts including inner magnetic steel and outer magnetic steel, wherein the inner magnetic steel is close to a motor rotating shaft, the outer magnetic steel is far away from the motor rotating shaft, and the intrinsic coercive force of the outer magnetic steel is greater than that of the inner magnetic steel; the magnetizing direction of the inner magnetic steel is identical to that of the outer magnetic steel, and the inner magnetic steel and the outer magnetic steel are both neodymium-iron-boron magnetic steel; the thickness of the outer magnetic steel is smaller than that of the inner magnetic steel. According to the hybrid magnetic steel rotor and the permanent magnet synchronous motor provided with the rotor, an outer side part which is far away from the motor rotating shaft adopts the neodymium-iron-boron magnetic steel with the high intrinsic coercive force, so that the rotor of the motor has good anti-demagnetizing performance, meanwhile, an inner side part which is close to the motor rotating shaft adopts the neodymium-iron-boron magnetic steel with the low intrinsic coercive force and high residual magnetic flux density, so that the production cost of the motor is greatly reduced on the premise of guaranteeing the motor performance; meanwhile, a segmental structure is adopted, so that the vortex loss of a permanent magnet material can be reduced, the efficiency of the motor is increased, the temperature rise of the rotor is reduced, and the anti-demagnetizing performance of the rotor is further increased.
Description
Technical field
The present invention is relevant with the motor technology of new-energy automobile, particularly a kind of automobile permanent magnet synchronous motor mixing magnetic steel rotor and have this rotor.
Background technology
Motor is a kind of calutron realizing electric energy conversion according to the law of electromagnetic induction or transmit, its Main Function produces driving torque, as the power source of electrical equipment or various machinery, wherein, permagnetic synchronous motor has that torque rotary speed characteristic is good, efficiency is higher relative to other kind motor and controls the advantages such as convenient, therefore general electric automobile, especially electric automobile adopts permagnetic synchronous motor mostly.In the permanent magnet of various material, the residual magnetic flux density of Nd-Fe-B magnet steel is high, magnetic induction coercive force is large, and maximum magnetic energy is high, be the best permanent magnetic material of current magnetic property, thus in the automobile permanent magnet motor of electric automobile the general neodymium iron boron that adopts as permanent magnetic material.
Because the operational environment of automobile motor is complicated, and special instructions for use, therefore have some prerequisite performance requirements, as high torque density, high power density, complicated operating condition and higher temperature running environment can be adapted to, and the instantaneous short-circuit strategy etc. of demand fulfillment car load safety, these just require that the magnet steel of rotor needs very high magnetic property, anti-demagnetization capability, high-temperature stability etc., and then cause automobile permanent magnet synchronous motor to need to select good magnet steel.At present, the price of magnet steel is very high, occupies a big chunk cost that motor is produced, and along with the raising of magnet steel performance (being mainly anti-demagnetization performance), the price increasing degree of magnet steel is larger.
For meeting more severe service condition, present automobile motor generally adopts single magnetic property and all very high Nd-Fe-B magnet steel of anti-demagnetization performance (HCJ), and this structure substantially increases the manufacturing cost of motor.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of permagnetic synchronous motor mixing magnetic steel rotor and have this rotor, the service behaviour that permagnetic synchronous motor is good can be ensured and meet more severe automobile-used service condition, and significantly reducing again the cost of motor.
For solving the problems of the technologies described above, mixing magnetic steel rotor provided by the invention, magnet steel is made up of interior magnet steel and outer steel two parts, and wherein, magnet steel is near machine shaft, outer steel is away from machine shaft, and the HCJ of described outer steel is greater than the HCJ of interior magnet steel.
Simultaneously, the present invention also provides a kind of permagnetic synchronous motor with mixing magnetic steel rotor, comprise stator, rotor, machine shaft, electric machine stand and end cap, described stator comprises stator winding and stator core, described rotor comprises rotor core and magnet steel, and the magnet steel of described rotor is made up of interior magnet steel and outer steel two parts, and wherein, magnet steel is near machine shaft, outer steel is away from machine shaft, and the HCJ of described outer steel is greater than the HCJ of interior magnet steel.
In above-mentioned mixing magnetic steel rotor and permagnetic synchronous motor, interior magnet steel and outer steel are Nd-Fe-B magnet steel.
More excellent, the residual magnetic flux density of interior magnet steel is higher than the residual magnetic flux density of outer steel.
Preferably, the magnet steel of rotor is segmentation structure, and the every pole magnet steel be arranged in magnet steel groove is made up of interior magnet steel and outer steel two parts.
Wherein, interior magnet steel is identical with the magnetizing direction of outer steel.
Better, the thickness of outer steel is less than the thickness of interior magnet steel.
Usefulness of the present invention is:
1) magnet steel (integral type or segmented) of rotor is divided into inside and outside two parts, outside is away from the Nd-Fe-B magnet steel of part employing HCJ high (namely anti-demagnetization performance is high) of machine shaft, the rotor of such motor has good anti-demagnetization performance, inner side adopts HCJ low but the Nd-Fe-B magnet steel that residual magnetic flux density is high near the part of machine shaft simultaneously, the magnet steel price comparison low due to HCJ is cheap, greatly can reduce the manufacturing cost of motor like this on the basis ensureing motor performance;
2) magnet steel of rotor can adopt segmentation structure, be applicable to the rotor of yi word pattern rotor, V-shape rotor or other form, the eddy current loss of permanent magnetic material can be reduced, increase the efficiency of motor, reduce the temperature rise of rotor, increase the anti-demagnetization performance of rotor further;
3) rotor magnetic steel in permagnetic synchronous motor suitably can strengthen the thickness of inboard portion magnet steel, can improve the output performance of motor so further, and very little to motor manufacturing cost impact.
Accompanying drawing explanation
Fig. 1 is the first embodiment of mixing magnetic steel rotor of the present invention;
Fig. 2 is the second embodiment of mixing magnetic steel rotor of the present invention;
Fig. 3 is the structural representation of permagnetic synchronous motor of the present invention.
Wherein description of reference numerals is as follows:
1 is stator winding; 2 is outer steel; 3 is interior magnet steel; 4 is stator core; 5 is machine shaft; 6 is rotor core; 7 is flat key; 8 is bearing; 9 is end cap; 10 is electric machine stand; 11 is resolver; 12 is magnet steel groove.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is further detailed explanation.
In motor operation course, when the magnet steel of rotor inside is subject to large stator current impact (such as instantaneous short-circuit impulse current), magnet steel in rotor can demagnetize, and first this demagnetization occurs in the Outboard Sections of magnet steel near rotor outer circle (namely away from machine shaft) usually, and near the inboard portion of rotating shaft magnet steel generally little generations demagnetize or after demagnetize.
Therefore, in order to ensure the anti-demagnetization performance of rotor, mixing magnetic steel rotor provided by the invention, magnet steel is wherein made up of interior magnet steel and outer steel two parts, wherein interior magnet steel is near machine shaft, outer steel is away from machine shaft, and the HCJ of outer steel is greater than the HCJ of interior magnet steel.In this mixing magnetic steel rotor, magnet steel can be integral type, and can be also segmented (or sectional type), its material be neodymium iron boron.
As shown in Figure 1, for mixing the first embodiment of magnetic steel rotor, this rotor is yi word pattern, comprise rotor core 6, interior magnet steel 3 and outer steel 2, wherein rotor core 6 is formed by some layers of silicon steel plate stacking, and this rotor core 6 is formed with magnet steel groove 12, and magnet steel is arranged in magnet steel groove 12.Magnet steel is fraction block structure, in the present embodiment, for ends of the earth magnet steel, every pole magnet steel is by magnet steel 3 in the neodymium iron boron of machine shaft 5 and form away from the neodymium iron boron outer steel 2 of machine shaft 5, wherein the HCJ of outer steel 2 is high, the HCJ of interior magnet steel 3 is low but residual magnetic flux density is high, can ensure the output performance that motor is high and anti-demagnetization performance like this, significantly reduces again the manufacturing cost of motor because adopting the low magnet steel of HCJ.And the interior magnet steel 3 in every block magnet steel is identical with the magnetizing direction of outer steel 2, and in figure, shown in arrow, direction is magnetizing direction.
In addition, Figure 2 shows that the second embodiment of mixing magnetic steel rotor, the magnet steel of this rotor still adopts segmentation structure, for 16 blocks of magnet steel, arranges as V-shape, and the identical two blocks of magnet steel of adjacent magnetizing direction form a pole, therefore this rotor is still ends of the earth magnet steel.Interior magnet steel 3 in next block magnet steel of every pole is identical with the magnetizing direction of outer steel 2, and the direction of arrow marked in figure is its magnetizing direction.
Permagnetic synchronous motor containing this mixing magnetic steel rotor in the present invention, comprise stator, rotor, electric machine stand 10, machine shaft 5, end cap 9, wherein stator comprises stator winding 1 and stator core 4, rotor comprises rotor core 6 and magnet steel, magnet steel by magnet steel 3 near machine shaft 5 and in the high neodymium iron boron of HCJ, away from machine shaft 5 and the neodymium iron boron outer steel 2 that HCJ is low, residual magnetic flux density is high form.Rotor core 6 is fixed on machine shaft 5 by flat key 7, machine shaft 5 is arranged on electric machine stand 10 and end cap 9 by bearing 8, its non-output is provided with resolver 11, the structure of stator and mounting means identical with traditional permagnetic synchronous motor, therefore to repeat no more.
Mixing magnet steel of the present invention is applicable to various forms of rotor, as the yi word pattern of Fig. 1, the V-shape of Fig. 2, is certainly also applicable to other forms of rotor, and this is easy to realize to those skilled in the art.
According to the demand of anti-demagnetization performance etc., require away from the HCJ of the outer steel 2 of machine shaft 5 and anti-demagnetization performance high, simultaneously, according to the demand of driving force etc., require that the HCJ of the interior magnet steel 3 near machine shaft 5 is low, residual magnetic flux density is high, therefore, the thickness of interior magnet steel 3 can be made to be greater than the thickness of outer steel 2, the output performance of so further raising motor, but less on the manufacturing cost impact of motor.
Neodymium iron boron outer steel 2 shown in Fig. 1, Fig. 2 is adding man-hour with magnet steel 3 in neodymium iron boron, the polarised direction of selected magnet steel should be consistent with the direction of arrow marked in Fig. 1, Fig. 2, after sharp processing and plating antirust treatment, then embed in respective magnet steel groove 12 by the pre-magnetizing direction added selected by man-hour.Conveniently magnetize, as required rotor can be divided into several sections and carry out segmentation again and magnetize, direct complete machine can certainly be adopted to magnetize.
Rotor magnetic steel of the present invention (integral type or segmented) is divided into inside and outside two parts, outside is away from the Nd-Fe-B magnet steel of part employing HCJ high (namely anti-demagnetization performance is high) of machine shaft, the rotor of such motor has good anti-demagnetization performance, inner side adopts HCJ low but the Nd-Fe-B magnet steel that residual magnetic flux density is high near the part of machine shaft simultaneously, the magnet steel price comparison low due to HCJ is cheap, greatly can reduce the manufacturing cost of motor like this on the basis ensureing motor performance.
In addition, the magnet steel of rotor can adopt segmentation structure, is applicable to the rotor of yi word pattern rotor, V-shape rotor or other form, the eddy current loss of permanent magnetic material can be reduced, increase the efficiency of motor, reduce the temperature rise of rotor, increase the anti-demagnetization performance of rotor further.
Above by specific embodiment to invention has been detailed description, this embodiment is only preferred embodiment of the present invention, and it not limits the invention.Without departing from the principles of the present invention; those of ordinary skill in the art under the prerequisite not making creative work in the thickness of outer steel, the thickness of interior magnet steel, the arrangement of magnet steel etc. by other embodiments all that the modes such as any amendment, equivalent replacement, improvement obtain, all should be considered as in the technology category protected in the present invention.
Claims (12)
1. mix a magnetic steel rotor, it is characterized in that, the magnet steel of described rotor is made up of interior magnet steel and outer steel two parts, and wherein, magnet steel is near machine shaft, and outer steel is away from machine shaft, and the HCJ of described outer steel is greater than the HCJ of interior magnet steel.
2. mixing magnetic steel rotor according to claim 1, is characterized in that, described interior magnet steel and outer steel are Nd-Fe-B magnet steel.
3. mixing magnetic steel rotor according to claim 1, is characterized in that, the residual magnetic flux density of described interior magnet steel is higher than the residual magnetic flux density of outer steel.
4. mixing magnetic steel rotor according to claim 1, is characterized in that, the magnet steel of described rotor is segmentation structure, and every pole magnet steel is made up of interior magnet steel and outer steel two parts.
5. mixing magnetic steel rotor according to claim 1, is characterized in that, described interior magnet steel is identical with the magnetizing direction of outer steel.
6. mixing magnetic steel rotor according to claim 1, is characterized in that, the thickness of described outer steel is less than the thickness of interior magnet steel.
7. one kind has the permagnetic synchronous motor of mixing magnetic steel rotor, comprise stator, rotor, machine shaft, electric machine stand and end cap, described stator comprises stator winding and stator core, described rotor comprises rotor core and magnet steel, it is characterized in that, the magnet steel of described rotor is made up of interior magnet steel and outer steel two parts, and wherein, magnet steel is near machine shaft, outer steel is away from machine shaft, and the HCJ of described outer steel is greater than the HCJ of interior magnet steel.
8. the permagnetic synchronous motor with mixing magnetic steel rotor according to claim 7, it is characterized in that, described interior magnet steel and outer steel are Nd-Fe-B magnet steel.
9. the permagnetic synchronous motor with mixing magnetic steel rotor according to claim 7, it is characterized in that, the residual magnetic flux density of described interior magnet steel is higher than the residual magnetic flux density of outer steel.
10. the permagnetic synchronous motor with mixing magnetic steel rotor according to claim 7, it is characterized in that, the magnet steel of described rotor is segmentation structure, and every pole magnet steel is made up of interior magnet steel and outer steel two parts.
11. permagnetic synchronous motors with mixing magnetic steel rotor according to claim 7, it is characterized in that, described interior magnet steel is identical with the magnetizing direction of outer steel.
12. permagnetic synchronous motors with mixing magnetic steel rotor according to claim 7, it is characterized in that, the thickness of described outer steel is less than the thickness of interior magnet steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310726725.4A CN104753212A (en) | 2013-12-25 | 2013-12-25 | Hybrid magnetic steel rotor and permanent magnet synchronous motor provided with rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310726725.4A CN104753212A (en) | 2013-12-25 | 2013-12-25 | Hybrid magnetic steel rotor and permanent magnet synchronous motor provided with rotor |
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| Publication Number | Publication Date |
|---|---|
| CN104753212A true CN104753212A (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310726725.4A Pending CN104753212A (en) | 2013-12-25 | 2013-12-25 | Hybrid magnetic steel rotor and permanent magnet synchronous motor provided with rotor |
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| CN (1) | CN104753212A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394923A (en) * | 2017-08-30 | 2017-11-24 | 广东威灵电机制造有限公司 | Rotor core and rotor |
| CN110768418A (en) * | 2018-07-25 | 2020-02-07 | 广东美芝制冷设备有限公司 | Motor, compressor and refrigeration plant |
| CN112737172A (en) * | 2019-10-28 | 2021-04-30 | 新疆金风科技股份有限公司 | Motor rotor and motor |
| CN114530960A (en) * | 2020-11-04 | 2022-05-24 | 丰田自动车株式会社 | Motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10271722A (en) * | 1997-03-21 | 1998-10-09 | Matsushita Electric Ind Co Ltd | Permanent magnet buried rotor |
| CN101485064A (en) * | 2006-06-12 | 2009-07-15 | 雷米技术有限公司 | Magnet for a dynamoelectric machine, dynamoelectric machine and method |
| CN102201711A (en) * | 2010-03-23 | 2011-09-28 | 信越化学工业株式会社 | Rotor and permanent magnet rotating machine |
| CN203896066U (en) * | 2013-12-25 | 2014-10-22 | 联合汽车电子有限公司 | Mixed magnetic steel rotor and permanent-magnet synchronous motor therewith |
-
2013
- 2013-12-25 CN CN201310726725.4A patent/CN104753212A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10271722A (en) * | 1997-03-21 | 1998-10-09 | Matsushita Electric Ind Co Ltd | Permanent magnet buried rotor |
| CN101485064A (en) * | 2006-06-12 | 2009-07-15 | 雷米技术有限公司 | Magnet for a dynamoelectric machine, dynamoelectric machine and method |
| CN102201711A (en) * | 2010-03-23 | 2011-09-28 | 信越化学工业株式会社 | Rotor and permanent magnet rotating machine |
| CN203896066U (en) * | 2013-12-25 | 2014-10-22 | 联合汽车电子有限公司 | Mixed magnetic steel rotor and permanent-magnet synchronous motor therewith |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107394923A (en) * | 2017-08-30 | 2017-11-24 | 广东威灵电机制造有限公司 | Rotor core and rotor |
| CN107394923B (en) * | 2017-08-30 | 2020-03-06 | 广东威灵电机制造有限公司 | Rotor core and rotor |
| CN110768418A (en) * | 2018-07-25 | 2020-02-07 | 广东美芝制冷设备有限公司 | Motor, compressor and refrigeration plant |
| CN112737172A (en) * | 2019-10-28 | 2021-04-30 | 新疆金风科技股份有限公司 | Motor rotor and motor |
| CN114530960A (en) * | 2020-11-04 | 2022-05-24 | 丰田自动车株式会社 | Motor |
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Application publication date: 20150701 |