CN212992065U - Composite rotor of permanent magnet motor of electric vehicle - Google Patents
Composite rotor of permanent magnet motor of electric vehicle Download PDFInfo
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- CN212992065U CN212992065U CN202021708310.6U CN202021708310U CN212992065U CN 212992065 U CN212992065 U CN 212992065U CN 202021708310 U CN202021708310 U CN 202021708310U CN 212992065 U CN212992065 U CN 212992065U
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Abstract
The utility model discloses an electric motor car permanent magnet motor composite rotor, its characterized in that, this composite rotor comprises magnetic resistance section rotor and permanent magnet section rotor, specifically includes hollow rotor core and central pivot, rotor core center department is provided with the central pivot hole that is used for through the central pivot, and it tightly overlaps in motor center pivot, rotor core includes outer wall and inner wall, be provided with N group on rotor core's the terminal surface and be used for inserting the magnet steel groove of permanent magnet monomer, N is the even number, the symmetry inlays in the single group magnet steel groove and is equipped with two permanent magnet monomers; permanent magnet monomers with the same polarity are inserted into the same group of magnetic steel grooves, and permanent magnet monomers with opposite polarities are inserted into adjacent groups of magnetic steel grooves. The utility model discloses a synchronous improvement structure reduces material cost and makes performance such as torque density keep higher level, and motor torque density and power density are high, and anti irreversible demagnetization can the reinforce.
Description
Technical Field
The utility model relates to a permanent-magnet machine technical field for the new forms of energy electric motor car, concretely relates to electric motor car permanent-magnet machine composite rotor.
Background
The motor is a device for converting mechanical energy and electric energy, comprises a motor and a generator, is widely applied to a plurality of fields of industry, agriculture, aerospace, traffic, communication, computers, scientific research, office equipment, household appliances, medical equipment, environmental protection machinery and the like, particularly aims at overcoming the shortage of fuel resources and the damage of automobile exhaust emission to the natural environment, and actively strives to research and develop various new energy automobiles in various countries in the world; as a new energy pollution-free zero-emission automobile, the motor becomes a core power driving part and can be used as a generator to recover energy when the automobile is towed backwards.
Based on the characteristics of the electric automobile, the adopted motor has higher requirements, and in order to improve the highest speed, the motor should have higher instantaneous power and power density (W/kg); in order to increase the charging travel distance, the motor should have higher efficiency; moreover, the electric automobile works in a speed-changing way, so that the motor has higher high and low speed comprehensive efficiency; in addition, the device has strong overload capacity, large starting torque and quick torque response. The speed is low when the electric vehicle is started and climbs a slope, but the required moment is large; the torque required for normal operation is small and the speed is high.
At present, the motor of the electric automobile is mainly of three types:
the alternating current motor has the advantages of low efficiency, large volume and weight and poor speed responsiveness.
Secondly, the permanent magnet motor and the permanent magnet synchronous motor have own defects, and the permanent magnet material on the rotor can generate the phenomenon of magnetic decline under the conditions of high temperature, vibration and overcurrent, so that the motor is easy to damage under the relatively complicated working condition; and the price of the permanent magnet material is higher, so the cost of the whole motor and the control system thereof is higher. Permanent magnet synchronous motors are widely used in electric vehicles.
At present, the switched reluctance motor seems to be more consistent with the use requirement of the electric vehicle in various technical characteristics from the mature motor technology, but the vibration and noise problem of the switched reluctance motor is that the electric vehicle, particularly a small passenger vehicle, cannot bear the vibration and noise problem, so the switched reluctance motor is not popularized yet and is only in the test stage on a goods transport vehicle.
Among the prior art, chinese utility model patent that patent number is 201710676131.5 discloses a table pastes formula motor, table pastes formula electric motor rotor and stator, and table pastes formula electric motor rotor's magnet steel has the lateral surface towards the stator, the both sides of lateral surface have the side cut structure that sets up along its central line symmetry. The utility model provides a surface-mounted electric motor rotor has the side cut structure that sets up along its central line symmetry through the both sides at the lateral surface, can change the air gap length of the motor along each position of round surface in the stator, and then improves air gap magnetic field for air gap magnetic density and back electromotive force waveform sine degree improve, have reduced the harmonic and have accounted for than, and then have reduced torque pulsation, have effectively reduced motor vibration noise.
However, the prior art still has certain defects, the rare earth in the rare earth permanent magnet brushless motor is large in usage amount, the rare earth material is expensive, and the material cost of the rare earth permanent magnet material is more than half of the total cost of the whole motor material under normal conditions. Moreover, the price fluctuation of the rare earth permanent magnetic material is large, which is not beneficial to the long-term stable cost control of manufacturers. In order to reduce the material cost of the motor, if the using amount of the rare earth permanent magnet is directly reduced, the torque density of the motor can hardly reach the level of the existing permanent magnet brushless direct current motor, and the performance of the motor is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to prior art's the aforesaid is not enough, the utility model provides an electric motor car permanent-magnet machine composite rotor is through improving structural design to the realization reduces rare earth material's quantity, reduction material cost under the prerequisite of keeping motor torque density, and makes performance such as torque density keep higher level, thereby solves above-mentioned technical problem. The utility model discloses a compound rotor and embedding structure, its tombarthite permanent magnetic material that adopts reduce more than half for the permanent magnetic rotor of traditional electric motor car motor table structure relatively, can effectively reduce the environmental pollution because of exploiting the tombarthite ore deposit and bring, and its motor torque density and power density are high in addition, and anti-irreversible demagnetization ability is strong, and material cost has obtained reducing substantially.
In order to achieve the above object, the utility model provides a following technical scheme:
the composite rotor of the permanent magnet motor of the electric vehicle is characterized by comprising a reluctance section rotor and a permanent magnet section rotor, and specifically comprises a hollow rotor core and a central rotating shaft, wherein the center of the rotor core is provided with a central rotating shaft hole for passing through the central rotating shaft, the central rotating shaft hole is tightly sleeved on the central rotating shaft of the motor, the rotor core comprises an outer wall and an inner wall, the end surface of the rotor core is provided with N groups of magnetic steel grooves for inserting permanent magnet monomers, N is an even number, and two permanent magnet monomers are symmetrically embedded in the single group of magnetic steel grooves; permanent magnet monomers with the same polarity are inserted into the same group of magnetic steel grooves, and permanent magnet monomers with opposite polarities are inserted into adjacent groups of magnetic steel grooves.
The rotor core structure is provided with a plurality of rotor weight reduction grooves; the rotor lightening slots are arranged between the central rotating shaft and the magnetic steel slots, surround the center of a circle of the rotor iron core and are distributed in central symmetry.
The back electromotive force modification radius of the rotor core is 66.16 mm; the number of poles of the rotor electrode of the rotor core is 8, the included angle between the direct axis of the rotor motor and the quadrature axis of the rotor motor is 22.5 degrees, and the back electromotive force modification center offset distance is 26.13 mm.
The hollow rotor core is formed by laminating rotor punching sheets.
The length of the magnetic steel groove is 9mm, the width of the permanent magnet monomer inserted into the magnetic steel groove is 2.5mm, and the permanent magnet monomers are symmetrically inserted into the magnetic steel groove at an angle of 20 degrees; the included angle of the outer edge of the permanent magnet monomer is 27.3 degrees, and the included angle width of the magnetic bridge is 35.44 degrees.
The permanent magnet monomer is a rare earth permanent magnet monomer or a ferrite permanent magnet monomer.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model provides an electric motor car permanent-magnet machine composite rotor through improving the structure, when reducing the tombarthite material quantity, reducing material cost, makes the performance such as torque density of motor keep higher level. The utility model provides a composite rotor structure through the improvement design, makes its tombarthite permanent magnet material that adopts reduce more than half compared with traditional electric motor car motor table and paste the form permanent magnet rotor, and the material cost has obtained the reduction by a wide margin, can effectively reduce the environmental pollution because of exploiting the tombarthite ore and bring; meanwhile, the motor after improved design has high torque density and power density, strong irreversible demagnetization resistance and excellent comprehensive performance, and can meet the requirements of high-efficiency driving, flexible speed regulation and the like of a new energy electric vehicle.
(2) The back electromotive force modification radius of the rotor core structure of the composite rotor of the permanent magnet motor of the electric vehicle is set to be 66.16 mm; in the running process of the motor, the rotor core structure shapes the stator teeth to enable the counter electromotive force of the motor to be sine wave voltage, so that the torque pulsation and the motor noise output by the motor can be effectively reduced, and the output efficiency of the motor is improved.
In order to more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to specific embodiments.
Drawings
Fig. 1 is a schematic view of a top-down cross-sectional structure of a composite rotor of a permanent magnet motor of an electric vehicle according to an embodiment of the present invention;
fig. 2 is the utility model discloses electric motor car permanent-magnet machine composite rotor's structural design principle sketch map.
The attached drawings are as follows: 1. a rotor core; 2. a central rotating shaft; 3. a magnetic steel groove; 4. a rotor weight reduction groove; 5. a rotor motor straight shaft; 6. and (4) intersecting the shaft of the rotor motor.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, the composite rotor of the permanent magnet motor of the electric vehicle provided by the embodiment is composed of a reluctance section rotor and a permanent magnet section rotor, and specifically includes a hollow rotor core 1 and a central rotating shaft 2, the center of the rotor core 1 is provided with a central rotating shaft hole for passing through the central rotating shaft 2, the central rotating shaft hole is tightly sleeved on the central rotating shaft 2 of the motor, the rotor core 1 includes an outer wall and an inner wall, the end surface of the rotor core 1 is provided with N groups of magnetic steel slots 3 for inserting permanent magnet monomers, N is an even number, and two permanent magnet monomers are symmetrically embedded in the single group of magnetic steel slots 3; rare earth permanent magnet monomers or ferrite permanent magnet monomers with the same polarity are inserted into the same group of magnetic steel grooves 3, and rare earth permanent magnet monomers or ferrite permanent magnet monomers with opposite polarities are inserted into the adjacent group of magnetic steel grooves 3.
In the composite rotor of the permanent magnet motor of the electric vehicle in the embodiment, the rotor core 1 is structurally provided with a plurality of rotor weight reduction grooves 4; the rotor lightening slots 4 are arranged between the central rotating shaft 2 and the magnetic steel slots 3, surround the circle center of the rotor iron core 1 and are distributed in a centrosymmetric manner.
In the composite rotor of the permanent magnet motor of the electric vehicle in the embodiment, the back electromotive force modification radius of the rotor core 1 is set to be 66.16 mm; when the number of poles of the rotor electrode of the rotor core is 8, the included angle between the direct axis of the rotor motor and the quadrature axis of the rotor motor is 22.5 degrees, and the back electromotive force modification center offset distance is 26.13 mm.
The hollow rotor core is formed by laminating rotor punching sheets.
The length of the magnetic steel groove is 9mm, the width of the permanent magnet monomer inserted into the magnetic steel groove is 2.5mm, and the axial lead of each permanent magnet monomer and a horizontal line (or a tangent line) are symmetrically inserted into the magnetic steel groove at an angle of 20 degrees; the included angle of the outer edge of the permanent magnet monomer is 27.3 degrees, and the included angle width of the magnetic bridge is 35.44 degrees.
In the composite rotor of the permanent magnet motor of the electric vehicle in the embodiment, the hollow rotor core 1 is formed by laminating rotor punching sheets.
In the composite rotor of the permanent magnet motor of the electric vehicle in the embodiment, the length of the magnetic steel slot 3 is 9mm, the width of the permanent magnet monomer inserted into the magnetic steel slot 3 is 2.5mm, and the permanent magnet monomer is symmetrically inserted into the magnetic steel slot 3 at an angle of 20 degrees (the included angle between the axis line and the horizontal line or the tangent line); when the pole number of the permanent magnet composite rotor of the electric vehicle is 8, the included angle between the direct axis of the rotor motor and the quadrature axis of the rotor motor is 22.5 degrees, the back electromotive force modification center offset distance is 26.13mm, the included angle of the outer edge of the permanent magnet monomer is 27.3 degrees, and the width of the included angle of the magnetic bridge is 35.44 degrees.
The preparation method of the composite rotor of the permanent magnet motor of the electric vehicle comprises the following steps:
step one, preparing a rotor core 1 of the composite rotor, wherein the rotor core 1 is of a hollow structure and comprises an outer wall and an inner wall, a central rotating shaft hole for passing through a central rotating shaft 2 is formed in the center of the rotor core 1, and the rotor core 1 is tightly sleeved on the central rotating shaft 2;
setting the back electromotive force modification radius of the rotor core 1 structure to be 66.16 mm; when the motor runs, the rotor core 1 structure shapes the stator teeth to make the counter electromotive force of the motor be sine wave voltage;
the rotor core 1 is structurally provided with a plurality of rotor weight reduction grooves 4; the rotor weight reduction slots 4 are arranged between the central rotating shaft 2 and the magnetic steel slots 3 and are distributed around the center of the rotor iron core 1 in a central symmetry manner;
step two, arranging N groups of magnetic steel grooves 3 on the inner wall of the rotor core 1, wherein N is an even number, every two adjacent magnetic steel grooves 3 form a group of magnetic groove pairs, the two magnetic steel grooves 3 in each group of magnetic groove pairs are arranged in a V shape, the opening direction of the magnetic steel grooves faces the outer side of the rotor core 1, the magnetic groove pairs surround the rotor core 1 and are distributed in a central symmetry manner, and the two magnetic steel grooves 3 in the same group of magnetic groove pairs are symmetrically arranged on the basis of a straight line passing through the center of the rotor core 1;
setting the number of pole slots in a rotor core 1 of the motor according to needs, and calculating according to motors with different numbers of pole slots so as to obtain the insertion angle of the permanent magnet monomer in the rotor core 1, the outer edge included angle of the permanent magnet monomer and the included angle of the width of the magnetic bridge;
inserting a rare earth permanent magnet monomer or a ferrite permanent magnet monomer into the magnetic steel groove 3; rare earth permanent magnet monomers or ferrite permanent magnet monomers with the same polarity are inserted into the same group of the magnetic steel grooves 3, and rare earth permanent magnet monomers or ferrite permanent magnet monomers with opposite polarities are inserted into the adjacent group of the magnetic steel grooves 3, so that the composite rotor of the permanent magnet motor of the electric vehicle is manufactured.
The composite rotor of the permanent magnet motor of the electric vehicle in the embodiment is mainly designed by the following steps:
(1) the composite rotor of the permanent magnet motor of the electric vehicle in the embodiment can greatly reduce the use amount of rare earth materials and improve the performance of the motor by improving the structure of the composite rotor, thereby achieving the purposes of cost reduction and efficiency improvement. The utility model provides a composite rotor structure, through improving the design, the tombarthite permanent magnetic material that makes its adoption has reduced more than half for traditional electric motor car motor table pastes form permanent magnetic rotor relatively, and material cost has obtained reducing substantially, can effectively reduce the environmental pollution because of exploiting the tombarthite ore deposit and bring, and its motor torque density and power density are high in addition, and anti irreversible demagnetization ability is strong, can satisfy the high-efficient drive and the speed governing control demand of new forms of energy electric motor car.
(2) The compound rotor of electric motor car permanent-magnet machine in this embodiment sets up to 66.16mm through the back electromotive force modification radius with rotor core structure, at the motor operation in-process, rotor core structure carry out the modification to the stator tooth and make motor back electromotive force be sine wave voltage, can effectively reduce the torque ripple and the motor noise of motor output, improve motor output efficiency.
According to the utility model discloses the record of above-mentioned embodiment, and the electric motor car permanent magnet motor composite rotor who obtains to have similar such as other pole slots numbers all is within the protection scope of the utility model.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The composite rotor of the permanent magnet motor of the electric vehicle is characterized by comprising a reluctance section rotor and a permanent magnet section rotor, and specifically comprises a hollow rotor core and a central rotating shaft, wherein a central rotating shaft hole for passing through the central rotating shaft is formed in the center of the rotor core and is tightly sleeved on the central rotating shaft of the motor; permanent magnet monomers with the same polarity are inserted into the same group of magnetic steel grooves, and permanent magnet monomers with opposite polarities are inserted into adjacent groups of magnetic steel grooves.
2. The electric vehicle permanent magnet motor composite rotor of claim 1, wherein the rotor core structure is further provided with a plurality of rotor weight reduction slots; the rotor lightening slots are arranged between the central rotating shaft and the magnetic steel slots, surround the center of a circle of the rotor iron core and are distributed in central symmetry.
3. The electric vehicle permanent magnet motor composite rotor of claim 1, wherein the back emf shaping radius of the rotor core is 66.16 mm; the number of poles of the rotor electrode is 8, the included angle between the direct axis of the rotor motor and the quadrature axis of the rotor motor is 22.5 degrees, and the back electromotive force modification center offset distance is 26.13 mm.
4. The composite rotor of the permanent magnet motor of the electric vehicle as claimed in claim 1, wherein the hollow rotor core is formed by laminating rotor sheets.
5. The composite rotor of the permanent magnet motor of the electric vehicle as claimed in claim 1, wherein the length of the magnetic steel slot is 9mm, the width of the permanent magnet monomer inserted into the magnetic steel slot is 2.5mm, and each permanent magnet monomer is symmetrically inserted into the magnetic steel slot at an angle of 20 degrees; the included angle of the outer edge of the permanent magnet monomer is 27.3 degrees, and the included angle width of the magnetic bridge is 35.44 degrees.
6. The composite rotor of the permanent magnet motor of the electric vehicle as claimed in claim 1, wherein the permanent magnet monomers are rare earth permanent magnet monomers or ferrite permanent magnet monomers.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021708310.6U CN212992065U (en) | 2020-08-17 | 2020-08-17 | Composite rotor of permanent magnet motor of electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021708310.6U CN212992065U (en) | 2020-08-17 | 2020-08-17 | Composite rotor of permanent magnet motor of electric vehicle |
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| CN212992065U true CN212992065U (en) | 2021-04-16 |
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| CN202021708310.6U Active CN212992065U (en) | 2020-08-17 | 2020-08-17 | Composite rotor of permanent magnet motor of electric vehicle |
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