CN112737172B - Motor rotor and motor - Google Patents
Motor rotor and motor Download PDFInfo
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- CN112737172B CN112737172B CN201911029113.3A CN201911029113A CN112737172B CN 112737172 B CN112737172 B CN 112737172B CN 201911029113 A CN201911029113 A CN 201911029113A CN 112737172 B CN112737172 B CN 112737172B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention provides a motor rotor and a motor, wherein the motor rotor comprises a rotor magnetic yoke and a magnetic pole arranged on the rotor magnetic yoke, the magnetic pole comprises a plurality of magnetic steel units, each magnetic steel unit comprises at least two pieces of magnetic steel which are stacked in the radial direction of the rotor magnetic yoke, and the magnetic energy product of the magnetic steel closest to the rotor magnetic yoke in the at least two pieces of magnetic steel is larger than the magnetic energy product of the magnetic steel farthest to the rotor magnetic yoke. According to the motor rotor, each magnetic steel unit comprises at least two pieces of magnetic steel which are stacked in the radial direction of the rotor magnetic yoke, and the magnetic energy product of the magnetic steel closest to the rotor magnetic yoke is larger than that of the magnetic steel farthest from the rotor magnetic yoke, so that the rare earth consumption of the magnetic steel and the cost of the motor can be reduced on the premise of ensuring that the motor rotor does not generate demagnetization.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a motor rotor and a motor capable of reducing the consumption of rare earth.
Background
The permanent magnet generator becomes a main technical model in the field of wind generating sets due to the characteristics of high torque density, high generating efficiency and no need of additional excitation equipment. The rotor permanent magnets that provide air gap flux in permanent magnet generators are typically neodymium iron boron permanent magnets.
The neodymium iron boron permanent magnet can be divided into M material, H material, SH material, UH material, EH material, AH material and the like according to the sequence of the intrinsic coercive force from low to high, wherein the intrinsic coercive force is a physical quantity for measuring the demagnetization resistance of the magnet, the magnitude of the intrinsic coercive force is closely related to the temperature stability of the neodymium iron boron permanent magnet, and the higher the intrinsic coercive force is, the better the temperature stability is. The ndfeb permanent magnet can be divided into N38, N40, N42, N45, N48, N50, N52, etc. according to the sequence of the remanence and the magnetic energy product from low to high, wherein, remanence (i.e. remanence) means that the magnet can still keep a certain magnetization intensity in the original external magnetic field direction after the external magnetic field is removed after being magnetized to saturation, and the magnetic energy product is the product of the remanence and the magnetic field intensity of any point on the demagnetization curve and is one of important parameters for measuring the magnitude of the energy stored in the magnet.
In the operation process of the permanent magnet generator, the stability of the permanent magnet is a key factor for ensuring the reliability of the permanent magnet generator. Therefore, in order to ensure stability, an ndfeb permanent magnet having a large intrinsic coercive force and a large maximum energy product is generally used. In this case, however, the larger the amount of rare earth element used in the permanent magnet, the higher the cost of the permanent magnet. According to incomplete statistics, the cost of the permanent magnet accounts for about 30% of that of the permanent magnet generator. At present, the nation provides an index of wind and fire equivalent for a wind driven generator, and simultaneously provides a new development mode for rare earth elements serving as strategic materials of the nation, so that how to reduce the cost of the wind driven generator and the use amount of rare earth becomes the key point of the development of a permanent magnet generator.
Disclosure of Invention
Therefore, an object of the present invention is to provide a motor rotor with a novel structure to solve the problem of high cost of a wind turbine caused by an existing electronic rotor.
According to an aspect of the present invention, there is provided an electric motor rotor including a rotor yoke and a magnetic pole mounted on the rotor yoke, the magnetic pole including a plurality of magnetic steel units, each magnetic steel unit including at least two magnetic steels stacked in a radial direction of the rotor yoke, wherein a magnetic energy product of a magnetic steel closest to the rotor yoke of the at least two magnetic steels is larger than a magnetic energy product of a magnetic steel farthest from the rotor yoke.
Preferably, the magnetic energy product of the magnetic steel may be larger the closer to the rotor yoke.
Preferably, the closer to the rotor yoke, the smaller the intrinsic coercivity of the magnetic steel may be.
Preferably, the closer to the rotor yoke, the smaller the temperature coefficient of remanence and/or the temperature coefficient of intrinsic coercivity of the magnetic steel may be.
Preferably, the at least two magnetic steel surfaces can be attached to the rotor yoke.
Preferably, the at least two pieces of magnetic steel may have the same size.
Preferably, the thicknesses of the at least two pieces of magnetic steel may be different, wherein the thickness of the magnetic steel closer to the rotor yoke may be larger.
Preferably, at least two blocks of magnet steel can include first magnet steel, second magnet steel and third magnet steel, and first magnet steel mountable is on the rotor yoke to second magnet steel and third magnet steel can range upon range of on first magnet steel in proper order, and wherein, first magnet steel can be N42M number neodymium iron boron magnetic steel, and second magnet steel can be N42H number neodymium iron boron magnetic steel, and the third magnet steel can be N38SH number or N38UH number neodymium iron boron magnetic steel.
Preferably, two piece at least magnet steels can include first magnet steel and second magnet steel, and first magnet steel mountable is on the rotor yoke to the second magnet steel can range upon range of on first magnet steel, and wherein, first magnet steel can be N42M number neodymium iron boron magnetic steel and second magnet steel can be N38SH number neodymium iron boron magnetic steel, perhaps first magnet steel can be N42H number neodymium iron boron magnetic steel and second magnet steel can be N38SH number neodymium iron boron magnetic steel.
According to another aspect of the invention, there is provided an electric machine comprising an electric machine rotor as described above.
According to the motor rotor, each magnetic steel unit comprises at least two pieces of magnetic steel which are stacked in the radial direction of the rotor magnetic yoke, and the magnetic energy product of the magnetic steel closest to the rotor magnetic yoke is larger than that of the magnetic steel farthest from the rotor magnetic yoke, so that the rare earth consumption of the magnetic steel and the cost of the motor can be reduced on the premise of ensuring that the motor rotor does not generate demagnetization.
According to the motor rotor, a novel magnetic pole structure with preset demagnetization resistance and large magnetic energy product is formed by adopting a mode of combining multiple layers of magnetic steel with different magnetic energy products, demagnetization resistance, residual magnetic temperature coefficients and intrinsic coercive force temperature coefficients in the radial direction of a rotor magnetic yoke, and high air gap magnetic flux density and enough demagnetization resistance are provided on the premise of reducing the cost of a magnetic pole of the motor rotor.
Drawings
The above and other objects and features of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:
fig. 1 is a sectional view taken in a radial direction showing a partial structure of a motor according to an embodiment of the present invention.
Fig. 2 is a sectional view taken in an axial direction showing a partial structure of a motor according to an embodiment of the present invention.
Fig. 3 is a schematic view showing a partial structure of a magnetic pole of the rotor of the motor shown in fig. 1 and 2.
Fig. 4 is a graph showing the variation of the demagnetizing field strength of the magnetic poles of the motor rotor shown in fig. 1 and 2 as the distance from the air gap varies.
Fig. 5 to 7 are schematic views illustrating partial structures of magnetic poles of a rotor of an electric machine according to other embodiments of the present invention.
The reference numbers illustrate:
10: a motor rotor; 11: a rotor yoke; 12: a magnetic pole; 13: a rotor support; 20: a motor stator; 21: a stator core; 22: a winding; 23: a stator support; 30: an air gap; 121. 121', 124': a first magnetic steel; 122. 122', 125': a second magnetic steel; 123. 123': and a third magnetic steel.
Detailed Description
Embodiments in accordance with the present invention will now be described in detail with reference to the drawings, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In the following embodiments, the motor rotor and the motor of the present invention are described by taking an inner stator and outer rotor motor as an example, and the description is also applicable to an outer stator and inner rotor motor.
As shown in fig. 1 and 2, the motor includes a motor rotor 10 and a motor stator 20, an air gap 30 is formed between the motor rotor 10 and the motor stator 20, and the motor may be in the form of an outer rotor and an inner stator, or in the form of an inner rotor and an outer stator. The present application describes the embodiments of the present application with reference to an outer rotor motor as an example, but the present application is not limited to an outer rotor motor, and the present application may be implemented in an inner rotor motor by way of conversion. Specifically, the motor stator 20 includes a stator core 21, windings 22 embedded in slots formed in the stator core 21, and a stator bracket 23 supporting the stator core 21. The motor rotor 10 includes a rotor yoke 11, a plurality of magnetic poles 12 mounted on an inner wall of the rotor yoke 11, and a rotor support 13 supporting the rotor yoke 11. The magnetic pole 12 comprises a plurality of magnetic steel units. According to an embodiment of the present invention, each magnetic steel unit includes at least two magnetic steels stacked in a radial direction of the rotor yoke 11, and a magnetic energy product of the magnetic steel closest to the rotor yoke 11 is larger than a magnetic energy product of the magnetic steel farthest from the rotor yoke 11.
Specifically, as shown in fig. 1 to 3, each magnetic steel unit may include a first magnetic steel 121, a second magnetic steel 122, and a third magnetic steel 123 stacked in a radial direction of the rotor yoke 11, and each of the first magnetic steel 121, the second magnetic steel 122, and the third magnetic steel 123 is a neodymium-iron-boron permanent magnet. First magnetic steel 121 may be directly mounted on rotor yoke 11, and second magnetic steel 122 and third magnetic steel 123 may be sequentially stacked on first magnetic steel 121. The magnetic energy product of first magnetic steel 121 may be greater than the magnetic energy product of third magnetic steel 123.
As known from the magnetic characteristic parameters of the neodymium iron boron permanent magnet, the relative magnetic permeability of the permanent magnets of different grades is basically the same and is about 1.032 times of the vacuum magnetic permeability. In the operation process of the motor, when the motor is short-circuited and a transient short-circuit current peak value appears in the winding 22, a maximum demagnetizing field intensity exists near the maximum value of the short-circuit current, the maximum demagnetizing field intensity is provided at the air gap 30 close to the outer diameter of the motor stator 20, then as the distance between the motor rotor 10 and the outer diameter of the motor stator 20 increases, the demagnetizing magnetic potential generated by the winding short-circuit current generates a magnetic potential drop on the air gap 30 and the magnetic steel unit, so that the demagnetizing field intensity of the magnetic steel which is farther away from the motor stator 20 is smaller. Taking the motor in the embodiment as an example, when a three-phase short circuit occurs in the load, the demagnetizing field intensity shown in fig. 3 is shown in fig. 4 along a curve from the stator side of the motor to the rotor side of the motor, and the demagnetizing field intensity is reduced from 1050kA/m at the maximum to 970kA/m. Therefore, the magnetic steel is arranged at different positions, and the magnetic field intensity of the magnetic steel is different.
In this embodiment, the strength of the demagnetizing field applied to first magnetic steel 121 closest to rotor yoke 11 is less than that of third magnetic steel 123 farthest from rotor yoke 11, and thus the degree of demagnetization of first magnetic steel 121 closest to rotor yoke 11 is less than that of third magnetic steel 123 farthest from rotor yoke 11. Since the magnetic energy product of first magnetic steel 121 is greater than the magnetic energy product of third magnetic steel 123 in this embodiment, compared with the case where the magnetic energy product of first magnetic steel 121 is less than the magnetic energy product of third magnetic steel 123, the loss of the magnetic energy product can be reduced to a certain extent to ensure that the magnetic pole is not demagnetized. Optionally, considering that the intensity of the demagnetizing field received by the second magnetic steel 122 is less than the intensity of the demagnetizing field received by the third magnetic steel 123 and greater than the intensity of the demagnetizing field received by the first magnetic steel 121, the magnetic energy product of the second magnetic steel 122 may be within the range of the magnetic energy product of the first magnetic steel 121 and the magnetic energy product of the third magnetic steel 123, so that the loss of the magnetic energy product may be further reduced to ensure that the magnetic poles are not demagnetized. Preferably, the magnetic energy product of first magnetic steel 121, second magnetic steel 122 and third magnetic steel 123 may be gradually reduced.
In addition, in the present embodiment, first magnetic steel 121, second magnetic steel 122, and third magnetic steel 123 of each magnetic steel unit are laminated in the radial direction of rotor yoke 11, so that magnetic flux leakage between magnetic steel units adjacent in the circumferential direction of rotor yoke 11 can be prevented, and thus the magnetic flux utilization rate can be improved. Alternatively, the first magnetic steel 121 may be surface-mounted on the rotor yoke 11, and the rotor yoke 11 may be formed using a metal (such as iron) having good thermal conductivity, so that heat generated from the first magnetic steel 121, the second magnetic steel 122, and the third magnetic steel 123 during operation of the motor may be directly transferred to the rotor yoke 11 through the first magnetic steel 121, thereby facilitating heat dissipation.
As shown in fig. 2, the arrows in fig. 2 show the flow direction of the outside wind. When the motor operates, external wind can directly blow over from the outer surface of rotor yoke 11, and the heat generated on magnetic pole 12 that constitutes by first magnet steel 121, second magnet steel 122 and third magnet steel 123 can directly be transmitted to rotor yoke 11 via first magnet steel 121, then is taken away by external wind through the outer surface of rotor yoke 11, consequently is favorable to the heat dissipation.
In addition, during operation of the motor, the temperature of first magnetic steel 121 near rotor yoke 11 is relatively low, and the temperature of third magnetic steel 123 near air gap 30 is relatively high. According to the magnetic properties of the ndfeb permanent magnet, the intrinsic coercive force and the residual magnetism of the ndfeb permanent magnet are affected by the temperature, so that the demagnetization resistance and the magnetic energy product of the ndfeb permanent magnet are affected. The influence degree of the intrinsic coercivity by the temperature can be represented by an intrinsic coercivity temperature coefficient, and the influence degree of the remanence by the temperature can be represented by a remanence temperature coefficient. The intrinsic coercive force temperature coefficient and the residual magnetism temperature coefficient of the neodymium iron boron permanent magnet are negative numbers, and the larger the intrinsic coercive force temperature coefficient and the residual magnetism temperature coefficient are, the smaller the influence of the intrinsic coercive force and the residual magnetism on the temperature is.
Therefore, under the condition that the influence of the temperature on the magnetic properties of first magnetic steel 121 to first magnetic steel 123 is considered, because the strength of the demagnetizing field received by first magnetic steel 121 is less than the strength of the demagnetizing field received by second magnetic steel 122 and the strength of the demagnetizing field received by second magnetic steel 122 is less than the strength of the demagnetizing field received by third magnetic steel 123, in order to improve the demagnetization resistance of magnetic pole 12, the demagnetization resistance of third magnetic steel 123 may be greater than the demagnetization resistance of second magnetic steel 122, and the demagnetization resistance of second magnetic steel 122 may be greater than the demagnetization resistance of first magnetic steel 121. That is, the intrinsic coercive force of third magnetic steel 123 may be greater than the intrinsic coercive force of second magnetic steel 122, and the intrinsic coercive force of second magnetic steel 122 may be greater than the intrinsic coercive force of first magnetic steel 121.
In addition, according to the relation between the intrinsic coercivity and the intrinsic coercivity temperature coefficient: [ Hcj ] of] t ＝[Hcj] 20 (1+β t ) Wherein [ Hcj] t Is intrinsic coercive force at t ℃, [ Hcj ]] 20 Intrinsic coercive force, beta, at 20 deg.C t Is the intrinsic coercive force temperature coefficient. The smaller the absolute value of the intrinsic coercive force temperature coefficient beta is, the better the demagnetization resistance and the temperature stability of the magnet are. Therefore, considering the influence of temperature on first to third magnetic steels 121 to 123, the intrinsic coercive force temperature coefficient of third magnetic steel 123 may be larger than that of second magnetic steel 122, and the intrinsic coercive force temperature coefficient of second magnetic steel 122 may be larger than that of first magnetic steel 121.
Similarly, according to the relationship between the remanence and the remanence temperature coefficient: [ Br] t ＝[Br] 20 (1+α t ) Wherein [ Br ]] t Is remanence at t ℃, [ Br ]] 20 The remanence at 20 ℃ and alpha is the remanence temperature coefficient. The smaller the absolute value of the temperature coefficient of remanence alpha, the remanence of the magnetThe greater the induction strength and thus the greater the magnetic energy product at a predetermined magnetic field strength. Therefore, in consideration of the influence of temperature on first to third magnetic steels 121 to 123, the remanence temperature coefficient of third magnetic steel 123 may be larger than that of second magnetic steel 122, and the remanence temperature coefficient of second magnetic steel 122 may be larger than that of first magnetic steel 121.
Therefore, in the case of comprehensively considering the magnetic energy and the demagnetization resistance, in the embodiment of fig. 3, the magnetic energy product of the first magnetic steel 121 may be equal to the magnetic energy product of the second magnetic steel 122 and greater than the magnetic energy product of the third magnetic steel 123, and the intrinsic coercive force, the intrinsic coercive force coefficient, and the remanence temperature coefficient of the first, second, and third magnetic steels 121, 122, and 123 may be gradually increased. As an example, first magnetic steel 121 may be N42M nd fe-b magnetic steel, second magnetic steel 122 may be N42H nd fe-b magnetic steel, and third magnetic steel 123 may be N38SH nd fe-b magnetic steel.
Further, in fig. 3, the sectional shapes of first magnetic steel 121, second magnetic steel 122, and third magnetic steel 123 are shown as rectangular shapes, but the sectional shapes of first magnetic steel 121, second magnetic steel 122, and third magnetic steel 123 are not limited thereto, and the sectional shapes thereof may also be other shapes such as a trapezoid. Optionally, the sizes of the first magnetic steel 121, the second magnetic steel 122 and the third magnetic steel 123 are completely the same, so that the first magnetic steel 121, the second magnetic steel 122 and the third magnetic steel 123 of different brands can adopt the same production mold, and therefore, the production efficiency can be improved.
Specific steel numbers and shapes of first to third magnetic steels 121 to 123 included in the magnetic steel unit are described above with reference to the embodiment in fig. 3, but the present invention is not limited thereto. Next, a magnetic steel unit according to another embodiment of the present invention will be described with reference to fig. 5.
As shown in fig. 5, each magnetic steel unit may include a first magnetic steel 121', a second magnetic steel 122', and a third magnetic steel 123' stacked in a radial direction of the rotor yoke 11. First magnetic steel 121' may be N42M number neodymium iron boron magnetic steel, second magnetic steel 122' may be N42H number neodymium iron boron magnetic steel, and third magnetic steel 123' may be N38UH number neodymium iron boron magnetic steel or higher brands N40UH, etc.
Furthermore, first magnetic steel 121', second magnetic steel 122', and third magnetic steel 123' may have different heights. For example, the height h1 'of the first magnetic steel 121' may be greater than the height h2 'of the second magnetic steel 122', and the height h2 'of the second magnetic steel 122' may be greater than the height h3 'of the third magnetic steel 123', but is not limited thereto. In the case where height h1 'of first magnetic steel 121' is greater than height h2 'of second magnetic steel 122' and is also greater than height h3 'of third magnetic steel 123', a sufficient magnetic energy product can be further ensured.
Although the embodiment in which each magnetic steel unit includes three pieces of magnetic steel stacked in the radial direction of the rotor yoke 11 is described above with reference to fig. 3 and 5, the present invention is not limited thereto. In the example shown in fig. 6 and 7, each magnetic steel unit may further include two magnetic steels laminated in the radial direction of the rotor yoke 11. Next, the structure of the magnetic steel unit will be described in detail with reference to fig. 6 and 7.
In fig. 6, each magnetic steel unit may include a first magnetic steel 124 and a second magnetic steel 125 stacked in a radial direction of the rotor yoke 11, the first magnetic steel 124 being surface-mounted on the rotor yoke 11, the second magnetic steel 125 being stacked on the first magnetic steel 124. The magnetic energy product of first magnetic steel 124 may be greater than the magnetic energy product of second magnetic steel 125. The intrinsic coercivity of the first magnetic steel 124 may be smaller than the intrinsic coercivity of the second magnetic steel 125. The remanence temperature coefficient and the intrinsic coercivity temperature coefficient of the first magnetic steel 124 can be smaller than the remanence temperature coefficient and the intrinsic coercivity temperature coefficient of the second magnetic steel 125, respectively. By way of example, first magnetic steel 124 may be N42M nd fe-b magnetic steel, and second magnetic steel 125 may be N38SH nd fe-b magnetic steel, but is not limited thereto. Furthermore, the height h4 of the first magnetic steel 124 may be greater than the height h5 of the second magnetic steel 125.
In fig. 7, each magnetic steel unit may include a first magnetic steel 124' and a second magnetic steel 125' stacked in a radial direction of the rotor yoke 11, the first magnetic steel 124' being surface-mounted on the rotor yoke 11, and the second magnetic steel 125' being stacked on the first magnetic steel 124 '. The magnetic energy product of the first magnetic steel 124 'may be greater than the magnetic energy product of the second magnetic steel 125'. The intrinsic coercivity of first magnetic steel 124 'may be less than the intrinsic coercivity of second magnetic steel 125'. The remanence temperature coefficient and the intrinsic coercivity temperature coefficient of the first magnetic steel 124 'can be smaller than the remanence temperature coefficient and the intrinsic coercivity temperature coefficient of the second magnetic steel 125', respectively. By way of example, first magnet 124 'may be N42H nd fe-b magnet, and second magnet 125' may be N38SH nd fe-b magnet, but is not limited thereto. In addition, the height h4 'of the first magnetic steel 124' may be greater than the height h5 'of the second magnetic steel 125'.
Although the example in which each magnetic steel unit includes three magnetic steels or two magnetic steels stacked in the radial direction of the rotor yoke 11 is described above with reference to fig. 3, 5, 6, and 7, respectively, the present invention is not limited thereto. The number of the stacked magnetic steels in the radial direction of the rotor yoke 11 can be designed based on actual requirements, and only the steel grade needs to be reasonably designed to meet the performance requirements of the motor. Of course, the magnetic steel is not limited to the neodymium iron boron permanent magnet, but a ferrite permanent magnet may also be used, and the specific brand and layout of the ferrite permanent magnet are designed according to the performance and the influence of the temperature.
In addition, according to another embodiment of the present invention, a motor including the motor rotor may be provided, and the advantageous effects of the motor rotor are the same as those of the motor rotor, and are not described herein again.
According to the motor rotor, each magnetic steel unit comprises at least two pieces of magnetic steel which are stacked in the radial direction of the rotor magnetic yoke, and the magnetic energy product of the magnetic steel closest to the rotor magnetic yoke is larger than that of the magnetic steel farthest from the rotor magnetic yoke, so that the rare earth consumption of the magnetic steel and the cost of the motor can be reduced on the premise of ensuring that the motor rotor does not generate demagnetization.
According to the motor rotor, a novel magnetic pole structure with preset demagnetization resistance and large magnetic energy product is formed by adopting a mode of combining multiple layers of magnetic steel with different magnetic energy products, demagnetization resistance, residual magnetic temperature coefficients and intrinsic coercive force temperature coefficients in the radial direction of a rotor magnetic yoke, and high air gap magnetic flux density and enough demagnetization resistance are provided on the premise of reducing the cost of a magnetic pole of the motor rotor.
Although the embodiments of the present invention have been described in detail above, those skilled in the art may make various modifications and alterations to the embodiments of the present invention without departing from the spirit and scope of the present invention. It will be understood that modifications and variations may occur to those skilled in the art, which modifications and variations may be within the spirit and scope of the embodiments of the invention as defined by the appended claims.
Claims (9)
1. A motor rotor is used in a wind generating set and comprises a rotor magnetic yoke (11) and a magnetic pole (12) arranged on the rotor magnetic yoke (11), the magnetic pole (12) comprises a plurality of magnetic steel units, each magnetic steel unit comprises at least two pieces of magnetic steel which are stacked in the radial direction of the rotor magnetic yoke (11),
the magnetic pole is characterized in that the magnetic pole (12) is mounted on the inner side wall of the rotor magnetic yoke (11), the magnetic energy product of the magnetic steel closest to the rotor magnetic yoke (11) in the at least two magnetic steels is larger than the magnetic energy product of the magnetic steel farthest from the rotor magnetic yoke (11), the temperature coefficient of remanence and the temperature coefficient of intrinsic coercive force of the magnetic steel closer to the rotor magnetic yoke (11) are smaller, the at least two magnetic steels include a first magnetic steel (121, 121 '), a second magnetic steel (122, 122 ') and a third magnetic steel (123, 123 '), the first magnetic steel (121, 121 ') is mounted on the rotor magnetic yoke (11), and the second magnetic steel (122, 122 ') and the third magnetic steel (123, 123 ') are sequentially stacked on the first magnetic steel (121, 121 ').
2. An electric machine rotor according to claim 1, characterised in that the magnetic energy product of the magnetic steel is larger the closer to the rotor yoke (11).
3. An electric machine rotor according to claim 1 or 2, characterised in that the intrinsic coercivity of the magnetic steel is smaller the closer to the rotor yoke (11).
4. An electric machine rotor, according to claim 1, characterized in that said at least two magnetic steel surfaces are attached to said rotor yoke (11).
5. The electric machine rotor of claim 1, wherein the at least two magnetic steels are the same size.
6. An electric machine rotor, according to claim 1, characterized in that the thickness of said at least two magnetic steels is different, wherein the thickness of the magnetic steel is larger the closer to the rotor yoke (11).
7. The electric machine rotor according to claim 1, characterized in that the first magnetic steel (121, 121 ') is N42M-grade ndfeb magnetic steel, the second magnetic steel (122, 122 ') is N42H-grade ndfeb magnetic steel, and the third magnetic steel (123, 123 ') is N38 SH-grade or N38 UH-grade ndfeb magnetic steel.
8. An electric machine rotor, according to claim 1, characterized in that said at least two magnetic steels comprise a first magnetic steel (124, 124 ') and a second magnetic steel (125, 125 '), said first magnetic steel (124, 124 ') being mounted on said rotor yoke (11) and said second magnetic steel (125, 125 ') being laminated on said first magnetic steel (124, 124 '),
wherein, first magnet steel (124) is N42M number neodymium iron boron magnetic steel just second magnet steel (125) is N38SH number neodymium iron boron magnetic steel, perhaps first magnet steel (124 ') is N42H number neodymium iron boron magnetic steel just second magnet steel (125') is N38SH number neodymium iron boron magnetic steel.
9. An electric machine, characterized in that the electric machine comprises a machine rotor according to any one of claims 1-8.
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| CN201911029113.3A CN112737172B (en) | 2019-10-28 | 2019-10-28 | Motor rotor and motor |
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| CN201911029113.3A CN112737172B (en) | 2019-10-28 | 2019-10-28 | Motor rotor and motor |
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| CN112737172B true CN112737172B (en) | 2023-04-18 |
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| CN109787439A (en) * | 2019-03-19 | 2019-05-21 | 上海电气风电集团有限公司 | Manufacturing method, rotor and the motor of rotor |
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| DE112007001339T5 (en) * | 2006-06-12 | 2009-05-20 | REMY TECHNOLOGIES LLC., Pendleton | Magnet for a dynamoelectric machine, dynamoelectric machine and process |
| US7847461B2 (en) * | 2007-06-06 | 2010-12-07 | Gm Global Technology Operations, Inc. | Multi-layer magnet arrangement in a permanent magnet machine for a motorized vehicle |
| US9147524B2 (en) * | 2011-08-30 | 2015-09-29 | General Electric Company | High resistivity magnetic materials |
| CN104753212A (en) * | 2013-12-25 | 2015-07-01 | 联合汽车电子有限公司 | Hybrid magnetic steel rotor and permanent magnet synchronous motor provided with rotor |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105811614A (en) * | 2016-03-17 | 2016-07-27 | 重庆大学 | Rotor structure for high speed permanent magnet synchronous machine |
| CN109787439A (en) * | 2019-03-19 | 2019-05-21 | 上海电气风电集团有限公司 | Manufacturing method, rotor and the motor of rotor |
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| CN112737172A (en) | 2021-04-30 |
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