CN116191803A - Magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation - Google Patents

Magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation Download PDF

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Publication number
CN116191803A
CN116191803A CN202310150014.0A CN202310150014A CN116191803A CN 116191803 A CN116191803 A CN 116191803A CN 202310150014 A CN202310150014 A CN 202310150014A CN 116191803 A CN116191803 A CN 116191803A
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CN
China
Prior art keywords
permanent magnet
magnetic field
axis
generating
axis magnetic
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Pending
Application number
CN202310150014.0A
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Chinese (zh)
Inventor
王明峤
梁晓宇
郑萍
苑子航
董鑫宇
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN202310150014.0A priority Critical patent/CN116191803A/en
Publication of CN116191803A publication Critical patent/CN116191803A/en
Pending legal-status Critical Current

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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
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • 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]
    • 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
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Synchronous Machinery (AREA)

Abstract

The invention discloses a combined permanent magnet excitation-based magnetic axis offset permanent magnet synchronous motor, belongs to the field of permanent magnet motors, and aims to solve the problem that current angles corresponding to respective peaks of existing permanent magnet torque and reluctance torque in a conventional built-in permanent magnet synchronous motor differ by 45 degrees. An armature winding is arranged on a stator iron core, and an inner rotor iron core of the armature winding is fixed on a rotating shaft; the permanent magnet generating the d-axis magnetic field, the permanent magnet groove and the permanent magnet generating the q-axis magnetic field are also included; a series of permanent magnet grooves are formed in the central area of each pole of the rotor core, each permanent magnet groove is symmetrical about the axis of the d-axis, and the permanent magnet grooves are sequentially arranged at intervals; the permanent magnets generating the q-axis magnetic field are symmetrically embedded in the rotor surface by taking the q-axis as the center, the permanent magnets are correspondingly arranged at the ends of the permanent magnet grooves, the permanent magnet grooves penetrate through the whole motor along the axial direction, the permanent magnets generating the d-axis magnetic field are arranged in the permanent magnet grooves, and the permanent magnets generating the q-axis magnetic field are embedded in the rotor surface corresponding to the ends of the permanent magnet grooves.

Description

Magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation
Technical Field
The invention relates to a high-performance design technology of a permanent magnet motor, and belongs to the field of permanent magnet motors.
Background
By virtue of the advantages of high power density, high power factor, high efficiency and the like, the permanent magnet synchronous motor is widely applied to the fields of new energy transportation equipment, driving devices and the like, and the built-in permanent magnet synchronous motor is widely applied to the core power devices in the fields because of high mechanical strength, wide speed regulation range and high torque density. Compared with a surface-mounted permanent magnet synchronous motor, the built-in permanent magnet synchronous motor can fully utilize reluctance torque and permanent magnet torque of the motor through reasonably designing stator and rotor magnetic circuits so as to further improve torque density of the motor; meanwhile, the peak rotating speed of the motor can be improved by carrying out field weakening control on the motor by utilizing higher inductance, so that the power density of the motor is further improved. The corresponding current angles of the permanent magnet torque and the reluctance torque reach respective peak values in the conventional built-in permanent magnet synchronous motor are different by 45 degrees, and the torque output potential of the motor cannot be fully utilized. Through the special design of the motor permanent magnet and the iron core structure, the angle offset between the inductance of the motor and the permanent magnet flux linkage can be realized by utilizing the magnetic axis offset principle, so that the effect of reducing the difference between the corresponding current angles of the peak points of the permanent magnet torque and the reluctance torque of the motor is achieved; this can further improve the torque output capability of the motor. Some scholars design a built-in permanent magnet synchronous motor adopting an asymmetric rotor structure based on a magnetic axis deviation principle, so that the difference value of corresponding current angles of a permanent magnet torque peak point and a reluctance torque peak point is reduced, and the problems of complex processing and assembly, increased magnetic circuit reluctance of the motor and the like of the corresponding motor still exist. Therefore, designing a magnetic axis offset motor with a more reasonable structure to further improve the torque density and the power density of the motor is a key for researching a performance improvement method of the built-in permanent magnet synchronous motor.
Disclosure of Invention
Aiming at the problem that the current angles corresponding to the respective peak values of the existing permanent magnet torque and reluctance torque in the conventional built-in permanent magnet synchronous motor are different by 45 degrees, the invention provides a magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation. The permanent magnet generating q-axis magnetic field is embedded at the end part of a corresponding permanent magnet groove under each pole of the rotor surface of a conventional built-in permanent magnet synchronous motor, and a permanent magnet magnetic field with a specific angle is synthesized through two permanent magnet groups with orthogonal direction magnetic fields; the maximum value of the output torque of the motor is raised to be the sum of the design maximum values of the permanent magnet torque and the reluctance torque.
The invention discloses a magnetic axis offset permanent magnet synchronous motor based on combined permanent magnet excitation, which comprises a stator core 1, a stator winding 2, a rotor core 3 and a rotating shaft 8; inside the stator core 1, a rotor core 3 is fixed on a rotating shaft 8, and an armature winding 2 is arranged on the stator core 1;
n layers of permanent magnet slots 4 are arranged below each pole of the rotor core 3, each slot penetrates through the whole motor along the axial direction, a permanent magnet 5 generating a d-axis magnetic field is arranged in each slot, n permanent magnets 5 generating the d-axis magnetic field below each pole form a permanent magnet group 9 generating the d-axis magnetic field, permanent magnets 6 generating a q-axis magnetic field are embedded on two sides of the end part of each permanent magnet slot 4 corresponding to the surface of the rotor core 3, and 2*n permanent magnets 6 generating the q-axis magnetic field below each pole form a permanent magnet group 10 generating the q-axis magnetic field;
the magnetic field direction of each permanent magnet in the permanent magnet group 9 generating the d-axis magnetic field and the permanent magnet group 10 generating the q-axis magnetic field is along the radial direction of the rotor; under the same pole, taking the axis of the d axis as a reference, the magnetizing directions of the permanent magnets 5 generating the d axis magnetic field under each pole are the same, the magnetizing directions of the permanent magnets 6 generating the q axis magnetic field on two sides 2*n are different, the magnetizing directions of the n permanent magnets 6 generating the q axis magnetic field on one side are the same as those of the permanent magnets 5 generating the d axis magnetic field under the same pole, and the magnetizing directions of the n permanent magnets 6 generating the q axis magnetic field on the other side are opposite to those of the permanent magnets 5 generating the d axis magnetic field under the same pole; the magnetizing directions of the permanent magnets 5 in the d-axis directions of the adjacent poles are opposite;
a magnetic bridge 7 is arranged between the permanent magnet 6 which is embedded on the surface and generates the q-axis magnetic field and the permanent magnet slot 4, and the magnetic field generated by the permanent magnet group 9 which generates the d-axis magnetic field directly enters the stator through the air gap by the rotor together with the magnetic field generated by the permanent magnet group 7 which generates the q-axis magnetic field and the permanent magnet group 10 which generates the q-axis magnetic field.
Preferably, the permanent magnets 6 of the q-axis magnetic field embedded in the surface of the rotor core 3 are arranged in the circumferential direction along the ends of the permanent magnet slots 4.
Preferably, n is a positive integer, n is between 2 and 5.
The invention has the beneficial effects that: the combined permanent magnet excitation-based magnetic axis offset permanent magnet synchronous motor constructs two magnetic fields with orthogonal directions on the motor rotor by embedding the permanent magnets which generate the q-axis magnetic field at the positions of the rotor surface corresponding to the ends of the permanent magnet grooves, and can realize the offset of the motor magnetic axis through the structural design of the motor, so that the current angles corresponding to the respective peak values of the permanent magnet torque and the reluctance torque of the motor are the same. The maximum value of the original reluctance torque and the permanent magnet torque of the motor is achieved under the condition that the original reluctance torque and the permanent magnet torque of the motor are not affected, and the torque density and the power density of the motor are improved.
Drawings
Fig. 1 is a magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation according to the present invention.
Fig. 2 is a schematic diagram of the permanent magnet magnetization direction of the combined permanent magnet excitation-based magnetic axis offset permanent magnet synchronous motor according to the present invention.
Fig. 3 is a graph of magnetic field distribution and synthesis effect of the combined permanent magnet excitation-based magnetic axis offset permanent magnet synchronous motor of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The first embodiment is as follows: the following describes the present embodiment with reference to fig. 1 to 3, and the magnetic axis offset permanent magnet synchronous motor based on combined permanent magnet excitation according to the present embodiment includes a stator core 1, a stator winding 2, a rotor core 3, and a rotating shaft 8; inside the stator core 1, a rotor core 3 is fixed on a rotating shaft 8, and an armature winding 2 is arranged on the stator core 1;
n layers of permanent magnet slots 4 are arranged below each pole of the rotor core 3, each slot penetrates through the whole motor along the axial direction, a permanent magnet 5 generating a d-axis magnetic field is arranged in each slot, n permanent magnets 5 generating the d-axis magnetic field below each pole form a permanent magnet group 9 generating the d-axis magnetic field, permanent magnets 6 generating a q-axis magnetic field are embedded on two sides of the end part of each permanent magnet slot 4 corresponding to the surface of the rotor core 3, and 2*n permanent magnets 6 generating the q-axis magnetic field below each pole form a permanent magnet group 10 generating the q-axis magnetic field;
the magnetic field direction of each permanent magnet in the permanent magnet group 9 generating the d-axis magnetic field and the permanent magnet group 10 generating the q-axis magnetic field is along the radial direction of the rotor; under the same pole, taking the axis of the d axis as a reference, the magnetizing directions of the permanent magnets 5 generating the d axis magnetic field under each pole are the same, the magnetizing directions of the permanent magnets 6 generating the q axis magnetic field on two sides 2*n are different, the magnetizing directions of the n permanent magnets 6 generating the q axis magnetic field on one side are the same as those of the permanent magnets 5 generating the d axis magnetic field under the same pole, and the magnetizing directions of the n permanent magnets 6 generating the q axis magnetic field on the other side are opposite to those of the permanent magnets 5 generating the d axis magnetic field under the same pole; the magnetizing directions of the permanent magnets 5 in the d-axis directions of the adjacent poles are opposite;
a magnetic bridge 7 is arranged between the permanent magnet 6 which is embedded on the surface and generates the q-axis magnetic field and the permanent magnet slot 4, and the magnetic field generated by the permanent magnet group 9 which generates the d-axis magnetic field directly enters the stator through the air gap by the rotor together with the magnetic field generated by the permanent magnet group 7 which generates the q-axis magnetic field and the permanent magnet group 10 which generates the q-axis magnetic field.
The permanent magnets 6 of the q-axis magnetic field embedded in the surface of the rotor core 3 are arranged along the end parts of the permanent magnet slots 4 in the circumferential direction, and the structure of the rotor core 3 between the two permanent magnet slots 4 is not affected.
n is a positive integer, the larger n is, the more complex the structure is, but the magnetic axis offset is easier to realize, the specific number can be determined according to the actual situation, and the number is generally between 2 and 5.
Examples: as shown in fig. 1, the magnetic axis offset permanent magnet synchronous motor based on combined permanent magnet excitation consists of a stator core 1, a stator winding 2, a rotor core 3, a permanent magnet slot 4, a permanent magnet 5 for generating a d-axis magnetic field, a permanent magnet 6 for generating a q-axis magnetic field, a magnetic bridge 7 and a rotating shaft 8, wherein n permanent magnets 5 for generating the d-axis magnetic field under each pole form a permanent magnet group 9 for generating the d-axis magnetic field, and 2 x n permanent magnets 6 for generating the q-axis magnetic field form a permanent magnet group 10 for generating the q-axis magnetic field; inside the stator core 1, a rotor core 3 is fixed on a rotating shaft 8, and an armature winding 2 is wound on the stator core 1; each pole of the rotor core 3 is provided with n permanent magnet slots 4, each slot penetrates through the whole motor along the axial direction, corresponding to the end part of each permanent magnet slot 4, 2*n permanent magnets 6 generating a q-axis magnetic field are embedded in the surface of the rotor core 3, and magnetic bridges 7 are arranged between the permanent magnets 6 generating the q-axis magnetic field and the permanent magnet slots 4, and 2*n permanent magnets are arranged under each pole; and n permanent magnets 5 generating a d-axis magnetic field are placed in n permanent magnet slots 4 under each pole, respectively. As shown in fig. 1, n is 3, each pole of the motor is provided with 3 permanent magnet slots 4,6 magnetic bridges 7,3 permanent magnets 5 generating d-axis magnetic fields form a permanent magnet group 9 generating d-axis magnetic fields, and 6 permanent magnets 6 generating q-axis magnetic fields form a permanent magnet group 10 generating q-axis magnetic fields.
When the motor works, the permanent magnet group which is arranged in the central area of each pole of the rotor core and generates the d-axis magnetic field and the permanent magnet group which is embedded in the end part of the corresponding permanent magnet slot on the surface of the rotor and generates the q-axis magnetic field form combined magnetic poles, so that permanent magnet excitation is provided for the motor together. The motor realizes the magnetic axis offset effect through the design of two groups of permanent magnets with combined excitation. Compared with a conventional built-in permanent magnet synchronous motor, the current angles corresponding to the peak points of the permanent magnet torque and the reluctance torque are equal, and the torque density and the power density of the motor are improved. The magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation naturally realizes magnetic axis offset through the combination of two groups of permanent magnets, and the permanent magnet groups which are embedded on the surface of a rotor and generate q-axis magnetic fields do not influence the armature magnetic flux path of the motor. The rotor permanent magnetic field can be jointly generated by the combined magnetic poles formed by the two groups of permanent magnets, the combined magnetic field is relatively flexible, and the requirements of different types of motors can be met. Compared with the conventional asymmetric magnetic axis offset permanent magnet synchronous motor, the motor has the advantages that the motor is simple in structure, and the problems that dynamic balance of a rotor is difficult to guarantee, machining and assembling are complex and the like are solved.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.

Claims (3)

1. The magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation is characterized by comprising a stator core (1), a stator winding (2), a rotor core (3) and a rotating shaft (8); inside the stator core (1), a rotor core (3) is fixed on a rotating shaft (8), and an armature winding (2) is arranged on the stator core (1);
n layers of permanent magnet slots (4) are arranged under each pole of the rotor iron core (3), each slot axially penetrates through the whole motor, a permanent magnet (5) generating a d-axis magnetic field is arranged in each slot, n permanent magnets (5) generating the d-axis magnetic field under each pole form a permanent magnet group (9) generating the d-axis magnetic field, permanent magnets (6) generating a q-axis magnetic field are embedded in the surface of the rotor iron core (3) at two sides of the end part of each permanent magnet slot (4), and 2*n permanent magnets (6) generating the q-axis magnetic field under each pole form a permanent magnet group (10) generating the q-axis magnetic field;
the magnetic field direction of each permanent magnet in the permanent magnet group (9) for generating the d-axis magnetic field and the permanent magnet group (10) for generating the q-axis magnetic field is along the radial direction of the rotor; under the same pole, taking a d-axis as a reference, the magnetizing directions of the permanent magnets (5) generating a d-axis magnetic field under each pole are the same, the magnetizing directions of the permanent magnets (6) generating a q-axis magnetic field on two sides 2*n are different, the magnetizing directions of the permanent magnets (6) generating the q-axis magnetic field on one side are the same as those of the permanent magnets (5) generating the d-axis magnetic field under the same pole, and the magnetizing directions of the permanent magnets (6) generating the q-axis magnetic field on the other side are opposite to those of the permanent magnets (5) generating the d-axis magnetic field under the same pole; the magnetizing directions of the permanent magnets (5) in the d-axis directions of the adjacent poles are opposite;
a magnetic bridge (7) is arranged between the permanent magnet (6) which is embedded on the surface and generates the q-axis magnetic field and the permanent magnet groove (4), and the magnetic field generated by the permanent magnet group (9) which generates the d-axis magnetic field directly enters the stator from the rotor through an air gap together with the magnetic field generated by the permanent magnet group (7) which generates the q-axis magnetic field and the permanent magnet group (10) which generates the q-axis magnetic field.
2. The permanent magnet synchronous motor with offset magnetic axis based on combined permanent magnet excitation according to claim 1, characterized in that the permanent magnets (6) of q-axis magnetic field embedded in the surface of the rotor core (3) are arranged along the ends of the permanent magnet slots (4) in the circumferential direction.
3. The combined permanent magnet excitation-based magnetic axis offset permanent magnet synchronous motor according to claim 1, wherein n is a positive integer, and n is 2-5.
CN202310150014.0A 2023-02-22 2023-02-22 Magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation Pending CN116191803A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310150014.0A CN116191803A (en) 2023-02-22 2023-02-22 Magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310150014.0A CN116191803A (en) 2023-02-22 2023-02-22 Magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation

Publications (1)

Publication Number Publication Date
CN116191803A true CN116191803A (en) 2023-05-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310150014.0A Pending CN116191803A (en) 2023-02-22 2023-02-22 Magnetic axis offset type permanent magnet synchronous motor based on combined permanent magnet excitation

Country Status (1)

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CN (1) CN116191803A (en)

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