CN114094738B - Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor - Google Patents
Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor Download PDFInfo
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- CN114094738B CN114094738B CN202111356909.7A CN202111356909A CN114094738B CN 114094738 B CN114094738 B CN 114094738B CN 202111356909 A CN202111356909 A CN 202111356909A CN 114094738 B CN114094738 B CN 114094738B
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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
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned 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
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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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
- H02K1/27—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
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
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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
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
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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
- H02K21/46—Motors having additional short-circuited winding for starting as an asynchronous motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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Abstract
The invention provides a self-starting permanent magnet auxiliary synchronous reluctance motor rotor and a motor, wherein the self-starting permanent magnet auxiliary synchronous reluctance motor rotor comprises a plurality of rotor punching sheets, the plurality of rotor punching sheets are laminated to form a rotor core, and permanent magnets are arranged on the rotor punching sheets; the permanent magnet includes the relative outer permanent magnet that is located radial outside and the relative inlayer permanent magnet that is located radial inboard, outer permanent magnet includes outer ferrite, the inlayer permanent magnet includes inlayer ferrite and neodymium iron boron, neodymium iron boron is located electric motor rotor's d is epaxial just neodymium iron boron is located outer ferrite with between the inlayer ferrite. According to the invention, the magnetic density of the middle position of the inner ferrite layer can be enhanced, so that the demagnetization resistance of the motor is improved, the permanent magnet flux linkage of the motor can be effectively increased, the permanent magnet torque of the motor is improved, the torque output capability of the motor is improved, and the running reliability of the motor is enhanced.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a self-starting permanent magnet auxiliary synchronous reluctance motor rotor and a motor.
Background
The self-starting permanent magnet auxiliary synchronous reluctance motor combines the advantages of an asynchronous motor on the basis of the permanent magnet auxiliary synchronous reluctance motor, has self-starting capability and can efficiently run at a synchronous rotating speed. Compared with a permanent magnet auxiliary synchronous reluctance motor, the motor can realize self-starting without a controller, so that the cost of the motor system is reduced, various losses generated by the controller are avoided, and the efficiency of the motor system is improved. Compared with a self-starting permanent magnet synchronous motor, the permanent magnet material of the motor mainly uses non-rare earth permanent magnet materials with low price, such as ferrite and the like, so that the cost of the permanent magnet material of the motor is greatly reduced, and the motor has great market economic advantages. Compared with a self-starting synchronous reluctance motor, the excitation magnetic field of the motor is generated by the permanent magnet, the power factor is obviously improved, and the burden of a power grid system is reduced. Compared with an asynchronous motor, the motor operates at a synchronous rotating speed, the slip loss of a rotor is eliminated, and the overall operating efficiency of the motor is higher. However, since the permanent magnet of the self-starting permanent magnet auxiliary synchronous reluctance motor is mainly ferrite, compared with neodymium iron boron, the residual magnetism and coercive force of a ferrite material are much weaker at the present stage, the residual magnetism of the ferrite is low, so that the permanent magnet torque of the motor is smaller, the torque output capacity is possibly insufficient, the coercive force of the ferrite is small, so that the anti-demagnetization energy of the motor is poor, and the permanent magnet is subjected to the action of a strong armature reaction magnetic field at the starting stage, so that the permanent magnet has a great demagnetization risk. The mixed permanent magnet rotor structure solves the problem that the permanent magnet torque of the self-starting permanent magnet auxiliary synchronous reluctance motor is small, improves the demagnetization resistance of the ferrite, and enhances the economical efficiency and the reliability of the operation of the motor.
The self-starting permanent magnet auxiliary synchronous reluctance motor in the prior art has the defects that the permanent magnet torque is small, so that the torque output capacity is possibly insufficient; the coercive force of the ferrite is small, so that the anti-demagnetization capability of the motor is poor, and the permanent magnet has great demagnetization risk and other technical problems under the action of a strong armature reaction magnetic field in the starting stage, so that the self-starting permanent magnet auxiliary synchronous reluctance motor rotor and the motor are researched and designed.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the self-starting permanent magnet auxiliary synchronous reluctance motor in the prior art has low coercive force of ferrite, so that the anti-demagnetization energy of the motor is poor, and the permanent magnet has great demagnetization risk under the action of a strong armature reaction magnetic field in the starting stage, thereby providing the self-starting permanent magnet auxiliary synchronous reluctance motor rotor and the motor.
In order to solve the problems, the invention provides a self-starting permanent magnet auxiliary synchronous reluctance motor rotor which comprises a plurality of rotor punching sheets, wherein the rotor punching sheets are laminated to form a rotor core, and permanent magnets are arranged on the rotor punching sheets; the permanent magnet includes the relative outer permanent magnet that is located radial outside and the relative inlayer permanent magnet that is located radial inboard, outer permanent magnet includes outer ferrite, the inlayer permanent magnet includes inlayer ferrite and neodymium iron boron, neodymium iron boron is located electric motor rotor's d is epaxial just neodymium iron boron is located outer ferrite with between the inlayer ferrite.
In some embodiments, the neodymium iron boron is disposed relatively close to or contiguous with the inner layer ferrite.
In some embodiments, the permanent magnets under one pole are radially arranged in at least 2 layers; and/or the motor rotor has 4 poles, 6 poles or 8 poles.
In some embodiments, an included angle between a connecting line from the center of the rotor to the edge of the permanent magnet is a pole arc angle of the permanent magnet, and then the range of the neodymium iron boron pole arc angle α 1 is 0.15 α 2-0.4 α 2, where α 2 is a pole arc angle of the inner layer ferrite on the same layer as the neodymium iron boron.
In some embodiments, the included angle between connecting lines from the center of the rotor to the edge of the ferrite is the polar arc angle of the ferrite, the ferrite comprises an outer layer ferrite and an inner layer ferrite, and the polar arc angles of the ferrites between different layers are gradually reduced along the direction outward along the radial direction of the d axis; the radial thicknesses of the multiple layers of ferrite are not equal, and the thickness of the ferrite between different layers increases in a radially outward direction along the d-axis.
In some embodiments, the pole arc coefficient of the motor is α 2/(360/2 p), which ranges from 0.7 to 0.9, where p is the pole pair number of the motor, and α 2 is the pole arc angle of the ferrite in the same layer as the neodymium iron boron.
In some embodiments, the thickness d of the neodymium iron boron along the magnetizing direction ranges from 5 sigma to 7 sigma, and sigma is the width of the motor air gap.
In some embodiments, the outer layer ferrite and/or the inner layer ferrite are in a fan-shaped ring structure, and the center of the fan-shaped ring structure faces to one side away from the center of the rotor; or the outer layer ferrite and/or the inner layer ferrite are in a multi-section structure, a bend is formed between two adjacent sections, and the multi-section structure is spliced into a U-shaped structure, a V-shaped structure or a W-shaped structure.
In some embodiments, the permanent magnet rotor further comprises a filling groove located radially outside the permanent magnet, the filling groove being filled with an electrically and magnetically conductive structure; one pole has at least 2 of said filled slots, at least 1 of said filled slots being located radially outward of one end of said outer ferrite, and at least 1 of said filled slots being located radially outward of the other end of said outer ferrite; and a first interval is formed between the filling groove and the outer layer ferrite, a second interval is formed between the filling groove and the inner layer ferrite, the first interval and the second interval are both the solid structure of the rotor punching sheet, and no magnetism isolating groove is arranged.
The invention also provides a motor comprising the self-starting permanent magnet auxiliary synchronous reluctance motor rotor.
The self-starting permanent magnet auxiliary synchronous reluctance motor rotor and the motor provided by the invention have the following beneficial effects:
1. according to the invention, the inner permanent magnet and the outer permanent magnet are arranged, the outer permanent magnet comprises the outer ferrite, the inner permanent magnet comprises the inner ferrite and the neodymium iron boron, the neodymium iron boron is positioned on the d shaft of the motor rotor, and the neodymium iron boron is positioned between the outer ferrite and the inner ferrite, so that the magnetic density of the middle position of the inner ferrite can be enhanced, the demagnetization resistance of the motor can be improved, the permanent magnetic flux linkage of the motor can be effectively increased, the permanent magnetic torque of the motor is improved, and the torque output capability of the motor is improved; the invention provides a mixed permanent magnet rotor structure of a self-starting permanent magnet auxiliary synchronous reluctance motor, which can improve the demagnetization resistance of ferrite and enhance the running reliability of the motor.
2. The invention provides a self-starting permanent magnet auxiliary synchronous reluctance motor hybrid permanent magnet rotor structure, wherein a rotor punching sheet is provided with a filling groove, a permanent magnet and a shaft hole, wherein the permanent magnet comprises two types of ferrite and neodymium iron boron or other materials with permanent magnet characteristics; the filling grooves are radially distributed along the circumference of the rotor and are arranged on the same layer with the ferrite, the filling grooves are filled with conductive and non-magnetic materials such as aluminum or aluminum alloy, and the like, and the motor can realize self-starting through the combined design of the filling grooves and the permanent magnets, so that the torque output capacity of the motor is improved, the loss of a controller is saved, the efficiency of the motor is improved, and the running economy of the motor is enhanced;
3. in the invention, no magnetism isolating groove is arranged between the filling groove and the ferrite which are arranged on the same layer, and the filling groove and the ferrite are only isolated by the reinforcing rib with a certain width, so that the structural strength of the rotor can be ensured; the squirrel-cage asynchronous magnetic field generated by the filling groove plays a role in shielding an armature reaction magnetic field, namely the squirrel-cage magnetic field has a protection effect on the permanent magnet, and the magnetic isolation groove is not arranged between the filling groove and the ferrite to reduce the obstruction to the squirrel-cage magnetic field, so that the squirrel-cage magnetic field can directly act on the ferrite, and the demagnetization resistance of the motor is improved;
drawings
Fig. 1 is a structural diagram of a rotor sheet of a self-starting permanent magnet auxiliary synchronous reluctance motor according to a first embodiment of the present invention;
fig. 1a is a structural diagram of a self-starting permanent magnet auxiliary synchronous reluctance motor rotor sheet according to a first embodiment of the present invention in one pole;
fig. 2 is an axial view of a self-starting permanent magnet assisted synchronous reluctance motor rotor according to a first embodiment of the present invention;
FIG. 3 is a graph comparing the magnetic flux density of permanent magnets of the present invention and the prior art;
fig. 4 is a structural diagram of a rotor sheet of a self-starting permanent magnet assisted synchronous reluctance motor according to a second embodiment of the present invention.
The reference numbers are given as:
1. rotor punching sheets; 2. filling the groove; 30. a permanent magnet; 31. an outer permanent magnet; 32. an inner permanent magnet; 3. a ferrite; 3a, outer ferrite; 3b, inner ferrite; 4. neodymium iron boron; 5. a shaft hole; 6. and an end ring.
Detailed Description
As shown in fig. 1-4, the invention provides a self-starting permanent magnet auxiliary synchronous reluctance motor rotor, which comprises a plurality of rotor laminations 1, wherein the rotor laminations 1 are laminated to form a rotor core, and the rotor laminations 1 are provided with filling grooves 2, permanent magnets 30 and a shaft hole 5; permanent magnet 30 is including the relative outer permanent magnet 31 that is located radial outside and the relative inner permanent magnet 32 that is located radial inboard, outer permanent magnet 31 includes outer ferrite 3a, inner permanent magnet 32 includes inlayer ferrite 3b and neodymium iron boron 4, neodymium iron boron 4 is located electric motor rotor's d is epaxial just neodymium iron boron 4 is located outer ferrite 3a with between the inlayer ferrite 3 b. The neodymium iron boron adopts parallel magnetization, and the magnetization direction is along the radial direction of the rotor.
According to the invention, the inner permanent magnet and the outer permanent magnet are arranged, the outer permanent magnet comprises the outer ferrite, the inner permanent magnet comprises the inner ferrite and the neodymium iron boron, the neodymium iron boron is positioned on the d shaft of the motor rotor, and the neodymium iron boron is positioned between the outer ferrite and the inner ferrite, so that the magnetic density of the middle position of the inner ferrite can be enhanced, the demagnetization resistance of the motor can be improved, the permanent magnetic flux linkage of the motor can be effectively increased, the permanent magnetic torque of the motor is improved, and the torque output capability of the motor is improved; the invention provides a mixed permanent magnet rotor structure of a self-starting permanent magnet auxiliary synchronous reluctance motor, which can improve the demagnetization resistance of ferrite and enhance the running reliability of the motor.
The invention provides a mixed permanent magnet rotor structure of a self-starting permanent magnet auxiliary synchronous reluctance motor.A rotor is provided with a filling groove, conductive and non-magnetic materials are filled in the groove, and the two ends of the filling groove are connected by end rings to form a rotor squirrel cage structure, so that the self-starting of the motor is realized; the neodymium iron boron is arranged between the ferrite layers, so that the magnetic density of the middle position of the ferrite of the inner layer is improved, and the permanent magnetic linkage of the motor is increased, so that the output of the motor is increased, and the efficiency of the motor is improved; through the structural design of the filling grooves and the permanent magnets, the protection effect of the squirrel-cage asynchronous magnetic field on the permanent magnets is maximized, so that the demagnetization resistance of the motor is enhanced, and the running reliability of the motor is improved.
Fig. 1 is a structural diagram of a rotor sheet according to a first embodiment of the present invention, in which a rotor is composed of a rotor sheet 1 having a specific structure and end rings 6 at two ends of a rotor core, and a filling groove 2, ferrite 3, neodymium iron boron 4, and a shaft hole 5 are formed in the rotor sheet 1. The filling groove 2 and the ferrite 3 jointly form a multilayer permanent magnetic barrier structure of the rotor. And a magnetic isolation groove is not arranged between the filling groove in each layer of permanent magnetic barrier and the permanent magnet, and only a reinforcing rib with certain width is used for isolation.
In some embodiments, the neodymium iron boron 4 is disposed relatively close to the inner ferrite 3b or contiguous with the inner ferrite 3 b. The neodymium iron boron is a further preferable arrangement position and arrangement form of the neodymium iron boron, is close to the inner layer ferrite or is connected with the inner layer ferrite, can effectively further increase the magnetic density strength of the middle position of the inner layer ferrite, further improves the demagnetization resistance of the motor, further increases the permanent magnet flux linkage of the motor, further improves the permanent magnet torque of the motor, and improves the torque output capacity of the motor.
In some embodiments, the permanent magnets 30 are arranged in at least 2 layers in the radial direction under one pole; and/or the motor rotor has 4 poles, 6 poles or 8 poles. The invention further prefers that the permanent magnet under one pole is more than 2 layers, which can further increase the magnetic density strength and improve the anti-demagnetization capability, and the motor rotor of the invention prefers a structure of 4 poles, 6 poles or 8 poles which are uniformly arranged along the circumferential direction, which further improves the magnetic field strength and improves the torque output capability.
In some embodiments, if an included angle between a connection line from the center of the rotor to the edge of the permanent magnet is a pole arc angle of the permanent magnet, the range of the arc angle α 1 of the ndfeb pole is 0.15 α 2 to 0.4 α 2, where α 2 is a pole arc angle of the inner layer ferrite on the same layer as the ndfeb pole. A connecting line from the center of the rotor to the edge of the neodymium iron boron is used as a polar arc angle alpha 1 of the neodymium iron boron, the range of the alpha 1 is 0.15 alpha 2-0.4 alpha 2, and the alpha 2 is used as a polar arc angle of the inner layer ferrite; the purpose that sets up like this can not cause the permanent magnet utilization ratio to descend because of the neodymium iron boron utmost point arc angle is too big, and the motor saturation increases, also can not be because of the neodymium iron boron utmost point arc angle undersize for there is the demagnetization risk in the middle part of inlayer ferrite.
In some embodiments, the polar arc angle of the ferrite is represented by the angle between the line connecting the center of the rotor to the edge of the ferrite, the ferrite comprises an outer layer ferrite 3a and an inner layer ferrite 3a, and the polar arc angle of the ferrite between different layers is gradually reduced along the radial direction of the d axis; the radial thicknesses of the multiple layers of ferrite are not equal, and the thickness of the ferrite between different layers increases in a radially outward direction along the d-axis.
The pole arc angle alpha 1 of the neodymium iron boron and the thickness of the magnetizing direction are controlled within the range, the anti-demagnetization capacity of the motor is improved, meanwhile, the magnetic performance of the neodymium iron boron is fully utilized, and the efficiency of the motor is improved.
In some embodiments, the pole arc coefficient of the motor is α 2/(360/2 p), which ranges from 0.7 to 0.9, where p is the pole pair number of the motor, and α 2 is the pole arc angle of the ferrite in the same layer as the neodymium iron boron. Further, the ferrites are radially arranged at 2 layers or more under one pole, an included angle between a connecting line from the center of the rotor to the edge of the inner layer ferrite is used for representing a polar arc angle alpha 2 of the permanent magnet, alpha 2/(360/2 p) is a polar arc coefficient of the motor, the value range of the polar arc coefficient is 0.7-0.9, and p is the number of pole pairs of the motor, so that the polar arc coefficient of the motor is set to be in a reasonable range, the air gap magnetic field and the no-load counter electromotive force of the motor are enabled to be as large as possible, and the efficiency of the motor is improved.
In some embodiments, the thickness d of the neodymium iron boron 4 along the magnetizing direction ranges from 5 σ to 7 σ, and σ is the motor air gap width. Neodymium iron boron is d along the thickness of the direction of magnetizing, and the value range of d is 5 sigma 7 sigma, and sigma is motor air gap width, and the aim at that sets up like this can not cause the permanent magnet utilization ratio to descend because of neodymium iron boron thickness is too big, also can not make neodymium iron boron self face the demagnetization risk because of neodymium iron boron thickness undersize.
In some embodiments, the outer layer ferrite 3a and/or the inner layer ferrite 3b are in a fan-ring structure, the center of the fan-ring structure faces to the side far away from the center of the rotor (as shown in fig. 1-2, the first embodiment); or the outer layer ferrite 3a and/or the inner layer ferrite 3b are in a multi-section structure, a bend is formed between two adjacent sections, and the multi-section structure is spliced into a U-shaped structure, a V-shaped structure or a W-shaped structure. The outer layer ferrite 3a and/or the inner layer ferrite 3b are preferably composed of a plurality of rectangular magnetic steels.
Fig. 4 is a structural view of a rotor sheet according to a second embodiment of the present invention. As shown in the figure, the ferrite 3 is rectangular magnetic steel, the ferrite is designed into a multi-layer U shape and can be arranged in a segmented mode, the rectangular magnetic steel is easy to machine and form, and magnetizing and mounting are simple. The rotor structure can also be used for 2-pole motors or other pole number motors. The technical effect same as that of the first embodiment can be achieved by adopting the technical scheme.
Further, the filling groove and the ferrite are arranged in the same layer, and the filling groove extends to the d axis along the direction perpendicular to the d axis. The filling groove is filled with conductive and non-magnetic materials such as aluminum or aluminum alloy and the like, and the two ends of the rotor in the axial direction are connected through end rings to form a squirrel cage structure, and the end ring materials are the same as those in the filling groove; the aluminum or aluminum alloy has good conductivity and low price, is widely used in the field of industrial motors, and is suitable for being used as a material for filling the slots.
The invention provides a self-starting permanent magnet auxiliary synchronous reluctance motor mixed permanent magnet rotor structure.A rotor punching sheet is provided with a filling groove, a permanent magnet and a shaft hole, wherein the permanent magnet comprises two materials of ferrite and neodymium iron boron or other materials with permanent magnet characteristics; the filling grooves are radially distributed along the circumference of the rotor and are arranged on the same layer with the ferrite, the filling grooves are filled with conductive and non-magnetic materials such as aluminum or aluminum alloy, and the like, and the motor can realize self-starting through the combined design of the filling grooves and the permanent magnets, so that the torque output capacity of the motor is improved, the loss of a controller is saved, the efficiency of the motor is improved, and the running economy of the motor is enhanced;
in some embodiments, the filling groove 2 is located radially outside the permanent magnet 30, and the filling groove 2 is filled with an electrically conductive and magnetically non-conductive structure; one pole has at least 2 of said filled slots 2, at least 1 of said filled slots 2 being located radially outward of one end of said outer ferrite 3a, at least 1 of said filled slots 2 being located radially outward of the other end of said outer ferrite 3 a; and a first interval is formed between the filling groove and the outer layer ferrite 3a, a second interval is formed between the filling groove and the inner layer ferrite 3b, the first interval and the second interval are both the solid structure of the rotor punching sheet 1, no magnetism isolating groove is arranged, and only a reinforcing rib with a certain width is reserved.
In the invention, no magnetism isolating groove is arranged between the filling groove and the ferrite which are arranged on the same layer, and the filling groove and the ferrite are only isolated by the reinforcing rib with certain width, so that the structural strength of the rotor can be ensured; the squirrel-cage asynchronous magnetic field generated by the filling groove plays a role in shielding an armature reaction magnetic field, namely the squirrel-cage magnetic field has a protection effect on the permanent magnet, and the magnetic isolation groove is not arranged between the filling groove and the ferrite to reduce the obstruction to the squirrel-cage magnetic field, so that the squirrel-cage magnetic field can directly act on the ferrite, and the demagnetization resistance of the motor is improved.
In the multilayer permanent magnetic barrier structure formed by the filling grooves and the ferrite, no magnetism isolating groove is arranged and only reinforcing ribs are used for separating, so that the design aims to ensure the mechanical structural strength of the rotor and fully utilize the protection effect of a squirrel cage asynchronous magnetic field on the permanent magnet; as current is induced on the squirrel cage bars in the starting stage of the motor, the squirrel cage asynchronous magnetic field generated by the current can shield part of the armature reaction demagnetization magnetic field, thereby protecting the permanent magnet on the rotor; the magnetic isolation groove is not arranged, so that the protection effect can be utilized to the maximum extent.
Furthermore, the filling groove is a closed groove, and the process of casting aluminum in the closed groove is mature at the present stage, so that the large-scale production is facilitated.
Furthermore, the thickness of the filling groove arranged on the same layer as the ferrite is the same as that of the position, close to the q axis, of the ferrite, so that the purpose of ensuring the smoothness of a q axis magnetic flux path is achieved, and the local saturation of a rotor magnetic circuit is avoided.
The invention also provides a self-starting permanent magnet auxiliary synchronous reluctance motor which comprises the self-starting permanent magnet auxiliary synchronous reluctance motor rotor.
The invention provides a hybrid permanent magnet rotor structure of a self-starting permanent magnet auxiliary synchronous reluctance motor, which realizes the self-starting of the motor through the combined design of a filling groove and a permanent magnet, improves the torque output capability of the motor and enhances the economical efficiency of the operation of the motor.
The invention provides a mixed permanent magnet rotor structure of a self-starting permanent magnet auxiliary synchronous reluctance motor, which can improve the demagnetization resistance of ferrite and enhance the running reliability of the motor.
Through the combined design of the filling groove and the permanent magnet, the motor can realize self-starting, the loss of a controller is saved, and the motor efficiency is improved.
Through the structural design of the filling groove and the permanent magnet, the demagnetization resistance of the motor is improved.
Through the structural design of the permanent magnet, the torque output capacity of the motor is improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention. The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. The utility model provides a self-starting permanent magnetism assists synchronous reluctance motor rotor which characterized in that:
the rotor punching sheet structure comprises a plurality of rotor punching sheets (1), a rotor core is formed by laminating the plurality of rotor punching sheets (1), and permanent magnets (30) are arranged on the rotor punching sheets (1); the permanent magnet (30) comprises an outer permanent magnet (31) and an inner permanent magnet (32), wherein the outer permanent magnet (31) is located on the radial outer side relatively, the inner permanent magnet (32) is located on the radial inner side relatively, the outer permanent magnet (31) comprises an outer ferrite (3 a), the inner permanent magnet (32) comprises an inner ferrite (3 b) and neodymium iron boron (4), the neodymium iron boron (4) is located on a d shaft of the motor rotor, and the neodymium iron boron (4) is located between the outer ferrite (3 a) and the inner ferrite (3 b);
the neodymium iron boron (4) is relatively close to the inner layer ferrite (3 b) or is connected with the inner layer ferrite (3 b); and taking an included angle between connecting lines from the center of the rotor to the edge of the permanent magnet as a pole arc angle of the permanent magnet, wherein the range of the neodymium iron boron pole arc angle alpha 1 is 0.15 alpha 2-0.4 alpha 2, and alpha 2 is the pole arc angle of the inner layer ferrite on the same layer with the neodymium iron boron.
2. The self-starting permanent magnet assisted synchronous reluctance machine rotor of claim 1, wherein:
-said permanent magnets (30) under one pole are arranged in radial direction in at least 2 layers; and/or the motor rotor has 4 poles, 6 poles or 8 poles.
3. The self-starting permanent magnet assisted synchronous reluctance machine rotor of claim 1, wherein:
an included angle between connecting lines from the center of the rotor to the edge of the ferrite is taken as a polar arc angle of the ferrite (3), the ferrite comprises an outer layer ferrite (3 a) and an inner layer ferrite (3 b), and the polar arc angles of the ferrites between different layers are gradually reduced along the radial outward direction of a d axis; the radial thicknesses of the multiple layers of ferrite are not equal, and the thickness of the ferrite between different layers increases in a radially outward direction along the d-axis.
4. The self-starting permanent magnet assisted synchronous reluctance machine rotor of claim 1, wherein:
the pole arc coefficient of the motor is alpha 2/(360/2 p), the value range of the pole arc coefficient is 0.7-0.9, wherein p is the pole pair number of the motor, and alpha 2 is the pole arc angle of the ferrite on the same layer as the neodymium iron boron.
5. The self-starting permanent magnet assisted synchronous reluctance machine rotor of claim 1, wherein:
the range of the thickness d of the neodymium iron boron (4) along the magnetizing direction is 5 sigma-7 sigma, and sigma is the width of the air gap of the motor.
6. The self-starting permanent magnet assisted synchronous reluctance machine rotor according to any one of claims 1 to 5, wherein:
the outer layer ferrite (3 a) and/or the inner layer ferrite (3 b) are in a fan-shaped ring structure, and the circle center of the fan-shaped ring structure faces to one side far away from the center of the rotor; or the outer layer ferrite (3 a) and/or the inner layer ferrite (3 b) are in a multi-section structure, a bend is formed between two adjacent sections, and the multi-section structure is spliced into a U-shaped structure, a V-shaped structure or a W-shaped structure.
7. The self-starting permanent magnet assisted synchronous reluctance machine rotor according to any one of claims 1 to 5, wherein:
further comprising a filling slot (2), said filling slot (2) being located radially outside said permanent magnet (30), the filling groove (2) is filled with a conductive and non-conductive magnetic structure; one pole has at least 2 of said filled slots (2), at least 1 of said filled slots (2) being located radially outside one end of said outer ferrite (3 a), at least 1 of said filled slots (2) being located radially outside the other end of said outer ferrite (3 a); and a first interval is formed between the filling groove and the outer layer ferrite (3 a), a second interval is formed between the filling groove and the inner layer ferrite (3 b), the first interval and the second interval are both the solid structure of the rotor punching sheet (1), and no magnetism isolating groove is arranged.
8. An electric machine characterized by: comprising a self-starting permanent magnet assisted synchronous reluctance machine rotor according to any of the claims 1-7.
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| CN202111356909.7A CN114094738B (en) | 2021-11-16 | 2021-11-16 | Self-starting permanent magnet auxiliary synchronous reluctance motor rotor and motor |
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| JPH10309050A (en) * | 1996-05-16 | 1998-11-17 | Matsushita Electric Ind Co Ltd | Compressor |
| CN208479309U (en) * | 2018-08-10 | 2019-02-05 | 中车株洲电力机车研究所有限公司 | A kind of permanent magnetism assist in synchronization magnetic resistance motor rotor |
| CN111614181A (en) * | 2020-06-24 | 2020-09-01 | 珠海格力电器股份有限公司 | Rotor structure of self-starting hybrid excitation permanent magnet auxiliary reluctance motor and motor |
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