CN113364181B - Reverse salient pole less rare earth permanent magnet synchronous motor rotor and motor thereof - Google Patents
Reverse salient pole less rare earth permanent magnet synchronous motor rotor and motor thereof Download PDFInfo
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- CN113364181B CN113364181B CN202110732301.3A CN202110732301A CN113364181B CN 113364181 B CN113364181 B CN 113364181B CN 202110732301 A CN202110732301 A CN 202110732301A CN 113364181 B CN113364181 B CN 113364181B
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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
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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
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
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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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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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
Abstract
The invention relates to the technical field of motor rotor structures, in particular to a reverse salient pole less rare earth permanent magnet synchronous motor rotor and a motor thereof, wherein the rotor comprises a plurality of permanent magnet groups and air groove groups, and the permanent magnet groups and the air groove groups are alternately arranged on the rotor in a spoke shape; the permanent magnet group is including locating the outer first permanent magnet group of rotor with locate the second permanent magnet group of rotor inlayer, the direction of magnetizing of first permanent magnet group is followed the radial extension of rotor, the direction of magnetizing of second permanent magnet group all is parallel with the circumference tangential of rotor. The invention can improve or keep the electromagnetic performance of the motor and simultaneously relieve the dependence of the permanent magnet motor on rare earth materials; and the occurrence of demagnetization of non-rare earth permanent magnet materials in the rare earth permanent magnet motor can be avoided under a weak magnetic control strategy.
Description
Technical Field
The invention relates to the technical field of motor rotor structures, in particular to a reverse salient pole less rare earth permanent magnet synchronous motor rotor and a motor thereof.
Background
The development of new energy industry is a strategic measure for coping with energy crisis and promoting green development. The rare earth permanent magnet synchronous motor is widely concerned because of the advantages of high efficiency, energy conservation, compact structure and the like. However, due to the high price of the rare earth permanent magnet material and the short supply of the rare earth material, uncertain factors are added for large-scale popularization and application of the rare earth permanent magnet synchronous motor. The rare earth-less hybrid permanent magnet synchronous motor can relieve the dependence of the permanent magnet motor on rare earth materials, and greatly reduces the manufacturing cost of the motor.
However, the non-rare earth ferrite material in the current rare earth-less hybrid permanent magnet synchronous motor is easily affected by armature reaction, and particularly when the motor is in a high-speed weak-magnetic running state, the non-rare earth permanent magnet material ferrite is easy to generate irreversible demagnetization, so that the safety and reliability of the motor are reduced. In addition, the rare earth-less permanent magnet synchronous motor has the problem of a narrow inherent speed regulation range as the rare earth permanent magnet synchronous motor; the larger quadrature axis inductance leads the magnetic circuit saturation degree of the motor to be larger, and the cross coupling magnetization phenomenon of the quadrature axis and the direct axis to be serious.
Chinese patent publication No. CN108777518B discloses a rotor structure of an asymmetric hybrid rare earth-less permanent magnet motor, which reduces the material cost of the permanent magnet motor, improves the torque characteristics, reduces the iron core and eddy current loss, and improves the efficiency of the motor.
However, the additional excitation winding on the rotor of the above scheme increases the copper loss of the rotor, reduces the efficiency, increases the manufacturing cost of the motor, and makes the control relatively complicated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a rotor of a reverse salient pole less rare earth permanent magnet synchronous motor and a motor thereof, which improve or keep the electromagnetic performance of the motor and simultaneously relieve the dependence of the permanent magnet motor on rare earth materials; and the occurrence of demagnetization of non-rare earth permanent magnet materials in the rare earth permanent magnet motor can be avoided under a weak magnetic control strategy.
In order to solve the technical problems, the invention adopts the technical scheme that:
the rotor comprises a rotor, wherein a plurality of permanent magnet groups and air slot groups are arranged on the rotor, and the permanent magnet groups and the air slot groups are alternately arranged on the rotor in a spoke shape; the permanent magnet group is including locating the outer first permanent magnet group of rotor with locate the second permanent magnet group of rotor inlayer, the direction of magnetizing of first permanent magnet group is followed the radial extension of rotor, the direction of magnetizing of second permanent magnet group all is parallel with the circumference tangential of rotor.
Preferably, the air groove group comprises a first air groove arranged on the outer layer of the rotor and a second air groove arranged on the inner layer of the rotor, and the first air groove is communicated with the outside. The arrangement of the first air groove and the second air groove can reduce the quadrature axis inductance of the motor, the iron core saturation degree of the rotor can be reduced, and the loss of the rotor iron core is reduced. The reduction of the quadrature axis inductance can also play a role in reducing the quadrature-direct axis cross coupling.
Preferably, the first air groove and the second air groove both extend in a strip shape, and the first air groove and the second air groove are tangentially parallel to the circumference of the rotor.
Preferably, a magnetic tape is arranged between the first air slot and the second air slot. The arrangement of the magnetic flux strip can reduce the demagnetization influence of the armature reaction magnetomotive force on the permanent magnet, and reduce the irreversible demagnetization risk of the permanent magnet.
Preferably, the first permanent magnet group and the second permanent magnet group are connected through a magnetic conduction bridge. The arrangement of the magnetic conduction bridge can limit the magnetic leakage of the permanent magnet and improve the utilization rate of the permanent magnet; when the armature reaction is stronger, the magnetic conduction bridge can also provide a path for the armature magnetomotive force, and the adverse effect of the armature reaction on the permanent magnet is avoided.
Preferably, the rotor is provided with a first rectangular groove for placing the first permanent magnet group and a second rectangular groove for placing the second permanent magnet group; the length direction of the first rectangular groove is parallel to the circumferential tangent of the rotor, and the length direction of the second rectangular groove extends along the radial direction of the rotor.
Preferably, the first permanent magnet group comprises at least two first permanent magnets, the first rectangular groove is divided into at least two sections of first magnetic grooves along the length direction of the first rectangular groove, the first permanent magnets are embedded into the first magnetic grooves in a one-to-one correspondence manner, and the adjacent first magnetic grooves are connected through a magnetic conduction bridge. The setting of a plurality of first permanent magnets can effectively reduce the magnetic resistance on the motor direct axis magnetic circuit, improves the direct axis inductance of motor.
Preferably, the second permanent magnet group comprises at least two second permanent magnets, the second rectangular groove is divided into at least two sections of second magnetic grooves along the direction perpendicular to the length direction of the second rectangular groove, the second permanent magnets are embedded into the second magnetic grooves in a one-to-one correspondence manner, and the adjacent second magnetic grooves are connected through a magnetic conduction bridge. The arrangement of a plurality of second permanent magnets can effectively reduce the magnetic resistance on the direct-axis magnetic circuit of the motor and increase the direct-axis inductance of the motor.
Preferably, a magnetism isolating groove is arranged at one end, close to the circle center of the rotor, of the second rectangular groove, and the magnetism isolating groove is communicated with the second rectangular groove.
The invention also provides a motor which comprises the rotor of the reverse salient pole less rare earth permanent magnet synchronous motor.
Compared with the prior art, the invention has the beneficial effects that:
(1) the dependence of the permanent magnet motor on rare earth materials is relieved while the electromagnetic performance of the motor is improved or maintained;
(2) the flux-weakening speed regulation capability of the motor can be improved, and the requirement of wide-speed running range of electric vehicles, hybrid electric vehicles and other applications is met;
(3) the occurrence of demagnetization of non-rare earth permanent magnet materials in the rare earth permanent magnet motor can be avoided under a weak magnetic control strategy.
Drawings
FIG. 1 is a schematic structural diagram of a rotor of a reverse salient pole rare earth-less permanent magnet synchronous motor according to the present invention;
FIG. 2 is a schematic structural view of a permanent magnet assembly of the present invention;
FIG. 3 is a schematic view of the magnetization direction of the permanent magnet assembly of the present invention;
FIG. 4 is a schematic view of the construction of the air slot set of the present invention;
FIG. 5 is a voltage vector diagram of a motor of the present invention;
fig. 6 is a comparison diagram of the quadrature-axis inductance and the direct-axis inductance of a motor according to the present invention.
The graphic symbols are illustrated as follows:
1-rotor, 2-first permanent magnet group, 3-second permanent magnet group, 4-first air groove, 5-second air groove, 6-magnetic strip, 7-magnetic bridge, 8-first rectangular groove, 9-second rectangular groove and 10-magnetic isolation groove.
Arrows in fig. 3 indicate the magnetizing directions of the first and second permanent magnets.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the showings are for the purpose of illustration only and are shown by way of illustration only and not in actual form, and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Example 1
As shown in fig. 1 to 6, a first embodiment of a rotor of a reverse-salient less rare-earth permanent magnet synchronous motor according to the present invention includes a rotor 1, wherein the rotor 1 is provided with a plurality of permanent magnet groups and a plurality of air slot groups, and the permanent magnet groups and the air slot groups are arranged on the rotor 1 in a spoke-like alternating manner; permanent magnet group is including locating the first permanent magnet group 2 on 1 inlayer of rotor and locating the second permanent magnet group 3 on 1 inlayer of rotor, and the direction of magnetizing of first permanent magnet group 2 extends along rotor 1's radial, and the direction of magnetizing of second permanent magnet group 3 all is parallel with rotor 1's circumference tangential.
As shown in fig. 1, the first permanent magnet group 2 and the second permanent magnet group 3 are both rectangular; specifically, the first permanent magnet group 2 is of a first rectangular structure, and the length direction of the first rectangular structure is tangentially parallel to the circumference of the rotor 1; the second permanent magnet group 3 is a second rectangular structure, and the length direction of the second rectangular structure extends along the radial direction of the rotor 1. As shown in fig. 1, the first permanent magnet group 2 is a rare earth neodymium iron boron magnet or a ferrite magnet, and the second permanent magnet group 3 is a rare earth neodymium iron boron magnet or a ferrite magnet; specifically, in this embodiment, the first permanent magnet group 2 is a neodymium iron boron magnet, and the second permanent magnet group 3 is a ferrite magnet. The second permanent magnet group 3 located in the inner layer is set as a ferrite magnet, so that the field weakening and speed expansion characteristics can be improved, and the demagnetization influence caused by armature reaction can be avoided.
In addition, the first permanent magnet group 2 and the second permanent magnet group 3 are connected through a magnetic conduction bridge 7. In the present embodiment, the magnetic circuits of the first permanent magnet group 2 and the second permanent magnet group 3 are connected in parallel. In this embodiment, the magnetic bridge 7 is made of a ferromagnetic material, specifically, silicon steel or iron-nickel alloy, and can also be made of other materials capable of realizing magnetic conduction, as shown in fig. 2.
In addition, a first rectangular groove 8 for placing the first permanent magnet group 2 and a second rectangular groove 9 for placing the second permanent magnet group 3 are arranged on the rotor 1; the first rectangular slot 8 has a length direction parallel to the tangential direction of the circumference of the rotor 1, and the second rectangular slot 9 has a length direction extending in the radial direction of the rotor 1, as shown in fig. 1. In the present embodiment, the number of the first rectangular grooves 8 is 4P, and the number of the second rectangular grooves 9 is 4P.
And a magnetism isolating groove 10 is arranged at one end of the second rectangular groove 9 close to the circle center of the rotor 1, and the magnetism isolating groove 10 is communicated with the second rectangular groove 9. Preferably, the magnetic shield grooves 10 are symmetrical about a straight axis, and the cross section of the magnetic shield grooves 10 is a trapezoidal structure, specifically, as shown in fig. 1 and 2, the short side of the trapezoidal structure is close to the center of the rotor 1, and the long side of the trapezoidal structure is close to the second rectangular groove 9.
In addition, the air groove group comprises a first air groove 4 arranged on the outer layer of the rotor 1 and a second air groove 5 arranged on the inner layer of the rotor 1, and the first air groove 4 is communicated with the outside. The first air grooves 4 and the second air grooves 5 extend in a strip shape, and the first air grooves 4 and the second air grooves 5 are tangentially parallel to the circumference of the rotor 1. In this embodiment, the first air slot 4 and the second air slot 5 have the same length, and both ends of the first air slot 4 and the second air slot 5 are arc-shaped.
As shown in fig. 4, the first air groove 4 and the second air groove 5 are symmetrical about a quadrature axis, and the span of the first air groove 4 and the second air groove 5 is 22-24 °; preferably, the first air groove 4 and the second air groove 5 have a span of 22 °. The width of the first air groove 4 is 6-8 mm, and the width of the second air groove 5 is 6-8 mm; preferably, the width of the first air groove 4 is 6.6mm, and the width of the second air groove 5 is 7 mm.
A flux belt 6 is provided between the first air groove 4 and the second air groove 5, and both sides of the flux belt 6 are in contact with the groove walls of the first air groove 4 and the second air groove 5, respectively. The arrangement of the magnetic tape 6 can reduce the demagnetization influence of the armature reaction magnetomotive force on the permanent magnet, and reduce the irreversible demagnetization risk of the permanent magnet. In the present embodiment, the magnetic strip is made of ferromagnetic material, specifically, silicon steel or iron-nickel alloy, and can also be made of other materials capable of realizing magnetic flux. In the embodiment, the width of the magnetic tape 6 is 3-5 mm; preferably, the width of the magnetic flux strip 6 is 3.8 mm. The width direction of the flux band 6 is a direction that coincides with the radial direction of the rotor 1.
According to the rotor of the reverse salient pole less rare earth permanent magnet synchronous motor, two materials of the rare earth neodymium iron boron permanent magnet and the non-rare earth ferrite magnet are adopted, the usage amount of the ferrite magnet accounts for more than 50% of the total amount of the magnet, the dependence of the permanent magnet motor on the rare earth material can be reduced on the basis of maintaining high efficiency, high power density and high torque density of the motor, and the manufacturing cost of the motor is greatly reduced; and in addition, the ferrite and the neodymium iron boron magnet are used for providing excitation magnetomotive force together, the temperature rise coefficients of the ferrite and the neodymium iron boron magnet are opposite, and a part of permanent magnet is still reserved for providing excitation when the temperature is too high or too low, so that the failure probability caused by the loss of magnetism or demagnetization of the permanent magnet of the motor in an extreme environment can be reduced. Because first permanent magnet group 2 is the neodymium iron boron magnetism body, as shown in fig. 1, the neodymium iron boron magnetism body is close to the air gap, can provide higher air gap magnetic density, maintains the torque density of motor, and its higher magnetic energy product also can bear the demagnetization influence that armature reaction brought better.
In addition, a first air groove 4 and a second air groove 5 are introduced into the rotor, so that the anti-salient pole characteristic is realized, and the problems that the permanent magnet of the rare earth-less hybrid excitation permanent magnet synchronous motor is easy to demagnetize and the speed regulation range is not wide are solved. And through increasing first air groove 4, second air groove 5 and adopting inhomogeneous air gap structure on rotor 1, can greatly increase quadrature axis magnetic resistance, reduce quadrature axis inductance, can effectively reduce the magnetic circuit saturation degree of motor and reduce the alternately saturation degree of quadrature-direct axis magnetic circuit.
Due to the fact that the anti-salient pole characteristic is achieved, when the motor operates in a base speed constant torque area, positive magnetism-increasing direct-axis current is introduced for obtaining positive magnetic resistance torque, the armature winding plays a role in increasing magnetism of the permanent magnet, and the anti-demagnetization capacity of the permanent magnet can be enhanced; meanwhile, the larger direct-axis inductor can reduce the needed weak magnetic direct-axis current and effectively improve the easy demagnetization characteristic of the permanent magnet. Moreover, the larger direct-axis inductance is beneficial to widening the constant-power speed regulation range of the motor and improving the maximum rotating speed of the motor; the reverse salient pole characteristic can enhance the no-load back electromotive force of the motor, and is beneficial to improving the overload multiple and the power factor of the motor.
Example 2
The present embodiment is similar to embodiment 1, except that, in the present embodiment, the first permanent magnet group 2 includes at least two first permanent magnets, the first rectangular groove 8 is divided into at least two first magnetic grooves along the length direction thereof, the first permanent magnets are embedded into the first magnetic grooves in a one-to-one correspondence, and the adjacent first magnetic grooves are connected by the magnetic conductive bridge 7. In this embodiment, the first permanent magnet group 2 includes two ndfeb magnets, and it should be noted that the thicknesses and lengths of the two ndfeb magnets may be the same or different. In this embodiment, the first rectangular slot 8 is divided into two sections along the length direction thereof to obtain two first magnetic slots, as shown in fig. 2, the two first magnetic slots are symmetrically arranged about a straight axis, and the two first magnetic slots are connected by the magnetic bridge 7. As shown in fig. 3, in this embodiment, the length a of the magnetic bridge 7 between the two first magnetic grooves is consistent with the width of the ndfeb magnet, the width b thereof is 0.4 to 1mm, and the thickness thereof is consistent with the thickness of the ndfeb magnet; preferably, the width b of the magnetic bridge 7 between the first magnetic grooves is 0.66 mm.
And the second permanent magnet group 3 comprises at least two second permanent magnets, the second rectangular groove 9 is divided into at least two sections of second magnetic grooves along the direction perpendicular to the length direction of the second rectangular groove, the second permanent magnets are embedded into the second magnetic grooves in a one-to-one correspondence manner, and the adjacent second magnetic grooves are connected through the magnetic guiding bridge 7. In the present embodiment, the second permanent magnet group 3 includes two ferrite magnets, and it should be noted that the lengths of the two ferrite magnets are the same, but the thicknesses of the two ferrite magnets may be the same or different. In this embodiment, the second rectangular slot 9 is divided into two sections in a direction perpendicular to the length direction thereof, so as to obtain two second magnetic slots, as shown in fig. 2, the two second magnetic slots are symmetrically arranged about the straight axis, and the two second magnetic slots are connected by the magnetic bridge 7. As shown in fig. 3, in the present embodiment, the length c of the magnetic bridge 7 between the two second magnetic slots is equal to the length of the ferrite magnet, the width d thereof is 0.7-1.5 mm, and the thickness thereof is equal to the thickness of the ferrite magnet; preferably, the width b of the magnetic bridge 7 between the second magnetic grooves is 1.1 mm.
In addition, the thickness of the ndfeb magnet in this embodiment is less than or equal to the thickness of the ferrite magnet, and the length of the first permanent magnet group 2 is greater than the length of the second permanent magnet group 3. Specifically, the first permanent magnet group 2 to the second permanent magnet group 3 has a length ratio of 1.6:1 and a width ratio of 0.51: 1.
In the present embodiment, the first air groove 4 and the second air groove 5 are provided, so that the anti-salient pole characteristic in which the direct-axis inductance is larger than the quadrature-axis inductance is realized. The unique characteristic of the ferrite can increase the magnetic density level of the permanent magnet and improve the demagnetization resistance of the permanent magnet, particularly the non-rare earth material ferrite with lower coercive force; the higher direct-axis inductance can improve the highest rotating speed and the constant power operating range of the motor, a deep weak magnetic control strategy is easier to adopt, and the higher direct-axis inductance can reduce the required weak magnetic direct-axis current at the same rotating speed, reduce the required inverter capacity and reduce the system cost; the low quadrature axis inductance reduces the magnetic circuit saturation degree and the quadrature-direct axis cross coupling magnetization degree of the rotor, and simultaneously reduces the torque reduction influence brought by the rotor.
Example 3
This embodiment is an electric machine comprising the rotor of the reverse-salient rare-earth-less permanent magnet synchronous machine of embodiment 1 or embodiment 2. As shown in fig. 5, due to the anti-salient pole characteristic of Ld > Lq, in order to obtain a positive reluctance torque in a constant torque region, the current angle needs to be adjusted to a positive angle range, the direct-axis current of the current is a positive magnetizing current, and the magnetic flux of the permanent magnet and the direct-axis current are in the same direction, so that the armature reaction has a magnetic flux enhancement effect and has an effect of enhancing the demagnetization resistance of the permanent magnet; when the motor runs at a high speed, the larger direct-axis inductor needs smaller direct-axis weak magnetic current, and the effect of enhancing the demagnetization resistance of the permanent magnet is achieved, so that the demagnetization resistance of the permanent magnet is effectively increased, and the running safety and reliability of the motor are improved. Meanwhile, as can be seen from fig. 5, the positive direct-axis current increases the amplitude of the no-load back electromotive force, which is helpful for improving the power factor and the overload multiple of the motor.
Furthermore, because of the segmentation treatment of the first permanent magnet group 2 and the splitting treatment of the second permanent magnet group 3, the direct axis inductance of the motor is increased, and because of the increase of the magnetic conduction bridge 7, the direct axis reluctance is further reduced, so that the direct axis inductance of the motor is improved, and the maximum operation rotating speed of the motor is favorably improved and the constant power speed regulation range is widened.
As shown in fig. 6, the direct-axis inductance of the motor of the present invention is always greater than the quadrature-axis inductance in the full current angle range, and especially, this characteristic is more prominent in the positive current angle range; meanwhile, the inductance is less influenced by armature reaction, and the quadrature axis inductance is reduced, so that the saturation degree of a magnetic circuit is reduced. The formula for calculating the maximum rotational speed of the motor is as follows:
in the formula, n max At the theoretical maximum speed, V lim Rated voltage for inverter, i lim Is the limit current of the inverter, p is the pole pair number psi f Is a permanent magnet flux linkage, L d Is a direct axis inductor. The method has the advantages that the larger direct-axis inductance is beneficial to improving the maximum rotating speed of the motor and widening the speed range of the motor.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A reverse salient pole less rare earth permanent magnet synchronous motor rotor comprises a rotor (1), and is characterized in that a plurality of permanent magnet groups and air groove groups are arranged on the rotor (1), and the permanent magnet groups and the air groove groups are alternately arranged on the rotor (1) in a spoke shape; the permanent magnet group comprises a first permanent magnet group (2) arranged on the outer layer of the rotor (1) and a second permanent magnet group (3) arranged on the inner layer of the rotor (1), the magnetizing direction of the first permanent magnet group (2) extends along the radial direction of the rotor (1), and the magnetizing directions of the second permanent magnet group (3) are all parallel to the circumferential tangential direction of the rotor (1); a first rectangular groove (8) for placing the first permanent magnet group (2) and a second rectangular groove (9) for placing the second permanent magnet group (3) are formed in the rotor (1); the length direction of the first rectangular groove (8) is tangentially parallel to the circumference of the rotor (1), and the length direction of the second rectangular groove (9) extends along the radial direction of the rotor (1); the first permanent magnet group (2) comprises at least two first permanent magnets, the first rectangular groove (8) is divided into at least two sections of first magnetic grooves along the length direction of the first rectangular groove, the first permanent magnets are embedded into the first magnetic grooves in a one-to-one correspondence mode, and the adjacent first magnetic grooves are connected through a magnetic conduction bridge (7); the second permanent magnet group (3) comprises at least two second permanent magnets, the second rectangular groove (9) is divided into at least two sections of second magnetic grooves along the direction perpendicular to the length direction of the second rectangular groove, the second permanent magnets are embedded into the second magnetic grooves in a one-to-one correspondence mode, and the adjacent second magnetic grooves are connected through a magnetic conduction bridge (7); the first permanent magnet group (2) is a neodymium iron boron magnet, and the second permanent magnet group (3) is a ferrite magnet.
2. The rotor of a reverse-salient rare-earth-less permanent magnet synchronous motor according to claim 1, wherein the air slot group comprises a first air slot (4) arranged at the outer layer of the rotor (1) and a second air slot (5) arranged at the inner layer of the rotor (1), and the first air slot (4) is communicated with the outside.
3. The rotor of a reverse-salient rare-earth-less permanent magnet synchronous motor according to claim 2, wherein the first air slot (4) and the second air slot (5) extend in a strip shape, and the first air slot (4) and the second air slot (5) are tangentially parallel to the circumference of the rotor (1).
4. A rotor according to claim 2, characterised in that a flux path (6) is provided between the first air slot (4) and the second air slot (5).
5. Rotor according to claim 1, characterised in that said first (2) and second (3) groups are connected by a magnetically conducting bridge (7).
6. The rotor of the reverse salient pole rare earth-less permanent magnet synchronous motor as claimed in claim 1, wherein a magnetism isolating groove (10) is arranged at one end of the second rectangular groove (9) close to the center of the rotor (1), and the magnetism isolating groove (10) is communicated with the second rectangular groove (9).
7. An electrical machine comprising a reverse-salient rare-earth-less permanent-magnet synchronous machine rotor according to any of claims 1 to 6.
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| CN202110732301.3A CN113364181B (en) | 2021-06-29 | 2021-06-29 | Reverse salient pole less rare earth permanent magnet synchronous motor rotor and motor thereof |
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| CN202110732301.3A CN113364181B (en) | 2021-06-29 | 2021-06-29 | Reverse salient pole less rare earth permanent magnet synchronous motor rotor and motor thereof |
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| CN109067037B (en) * | 2018-08-17 | 2020-06-26 | 江苏大学 | High-torque-density hybrid permanent magnet motor rotor structure |
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| CN111082560B (en) * | 2019-11-28 | 2021-10-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and motor |
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2021
- 2021-06-29 CN CN202110732301.3A patent/CN113364181B/en active Active
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