CN115296501A - Double-stator single-rotor permanent magnet synchronous motor - Google Patents
Double-stator single-rotor permanent magnet synchronous motor Download PDFInfo
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- CN115296501A CN115296501A CN202211052263.8A CN202211052263A CN115296501A CN 115296501 A CN115296501 A CN 115296501A CN 202211052263 A CN202211052263 A CN 202211052263A CN 115296501 A CN115296501 A CN 115296501A
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
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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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
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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
-
- 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
- H02K1/06—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]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/279—Magnets embedded in the magnetic core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a double-stator single-rotor permanent magnet synchronous motor, relates to the technical field of motors, and aims to optimize the structure of the motor to a certain extent, fully utilize the internal cavity of the motor and improve the torque density of the motor. The invention provides a double-stator single-rotor permanent magnet synchronous motor which comprises an outer motor, a rotor assembly and an inner motor; the rotor assembly comprises a plurality of outer rotor pole shoes and a plurality of inner rotor pole shoes, a cavity is formed inside the outer motor, the inner motor and the rotor assembly are both arranged in the cavity, and the rotor assembly is positioned between the inner motor and the outer motor; a plurality of outer rotor pole shoes are evenly arranged along the circumference of the outer motor, a plurality of inner rotor pole shoes are evenly arranged along the circumference of the inner motor, and gaps are formed between the outer rotor pole shoes and the outer motor and between the inner rotor pole shoes and the inner motor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a double-stator single-rotor permanent magnet synchronous motor.
Background
The belt conveyor is widely applied to coal mining working conditions as efficient conveying equipment, and the working conditions put high requirements on a driving motor of a belt conveyor. Traditional belt feeder adopts this kind of drive mode of asynchronous machine plus speed reducer more, and although this kind of drive technique is comparatively ripe, nevertheless has shortcomings such as the energy consumption is high, the maintenance volume is big and bulky. Therefore, the driving mode can not meet the requirement of greatly improving the performance of the belt conveyor in industrial and mining enterprises, and therefore the low-speed direct drive of the belt conveyor is realized by adopting the rare earth permanent magnet motor with high torque density and high efficiency.
However, most permanent magnet motors have larger diameters, and a larger inner cavity space is reserved in the motors. Therefore, if the torque density of the motor needs to be increased, the volume of the motor is increased, which is not favorable for the miniaturization of the motor, and the service environment of the motor is limited.
Therefore, it is urgently needed to provide a double-stator single-rotor permanent magnet synchronous motor to solve the problems in the prior art to a certain extent.
Disclosure of Invention
The invention aims to provide a double-stator single-rotor permanent magnet synchronous motor, which aims to optimize the structure of the motor to a certain extent, fully utilize an internal cavity of the motor and improve the torque density of the motor.
The invention provides a double-stator single-rotor permanent magnet synchronous motor which comprises an outer motor, a rotor assembly and an inner motor, wherein the outer motor is connected with the rotor assembly; the rotor assembly comprises a plurality of outer rotor pole shoes and a plurality of inner rotor pole shoes, a cavity is formed inside the outer motor, the inner motor and the rotor assembly are both arranged in the cavity, and the rotor assembly is positioned between the inner motor and the outer motor; the outer rotor pole shoes are uniformly distributed along the circumferential direction of the outer motor, the inner rotor pole shoes are uniformly distributed along the circumferential direction of the inner motor, and gaps are formed between the outer rotor pole shoes and the outer motor and between the inner rotor pole shoes and the inner motor.
The rotor assembly further comprises a magnetism isolating ring, and the magnetism isolating ring is located between the outer rotor pole shoe and the inner rotor pole shoe.
Specifically, a plurality of first embedding parts are formed on one side, facing the outer rotor pole shoe, of the magnetism isolating ring, and the first embedding parts are uniformly distributed along the circumferential direction of the magnetism isolating ring; the outer rotor pole shoe is provided with a first matching part corresponding to the first embedding part, and the first matching part is matched with the first embedding part so as to connect the outer rotor pole shoe with the magnetism isolating ring.
Furthermore, a plurality of second embedded parts are formed on one side of the magnetism isolating ring facing the inner rotor pole shoe, and the second embedded parts are uniformly distributed along the circumferential direction of the magnetism isolating ring; and a second matching part is formed at the position of the inner rotor pole shoe corresponding to the second embedding part, and the second matching part is matched with the second embedding part so as to connect the inner rotor pole shoe with the magnetism isolating ring.
More closely, first cooperation portion with second cooperation portion all is the dovetail tongue structure, first inlay establish the portion with the second inlays and establishes the portion and all is the dovetail groove structure.
More closely, first portion of establishing of inlaying with the second portion of establishing quantity is the same, and adjacent first portion of establishing of inlaying the axis with the axis of second portion of establishing is the angle setting.
A plurality of first air magnetic barriers are formed on the outer rotor pole shoe, and are symmetrically arranged along the axis of the outer rotor pole shoe; a plurality of second air magnetic barriers are formed on the inner rotor pole shoe and are symmetrically arranged along the axis of the inner rotor pole shoe; resin materials are poured into the first air magnetic barriers and the second air magnetic barriers.
Specifically, the outer rotor pole shoe and the inner rotor pole shoe are formed by sequentially stacking a plurality of silicon steel sheets, the first air magnetic barrier and the second air magnetic barrier are formed by cutting, and the ratio of the thickness of the first air magnetic barrier to the thickness of the outer rotor pole shoe and the ratio of the thickness of the second air magnetic barrier to the thickness of the inner rotor pole shoe are both 1.
Further, permanent magnets are arranged between the adjacent outer rotor pole shoes and the adjacent inner rotor pole shoes.
Further, the outer motor comprises an outer stator core and a first winding, and the inner motor comprises an inner stator core and a second winding; a plurality of first bearing grooves are formed in the inner ring wall surface of the outer stator core, the first bearing grooves are distributed at equal intervals along the circumferential direction of the inner ring wall surface of the outer stator core, the axis of each first bearing groove extends along the radial direction of the outer stator core, and two long sides of each first winding are respectively arranged in two adjacent first bearing grooves; the inner stator core comprises an outer ring wall surface, a plurality of first bearing grooves are formed in the outer ring wall surface of the inner stator core, the first bearing grooves are distributed at equal intervals along the circumferential direction of the outer ring wall surface of the inner stator core, the axis of each first bearing groove extends along the radial direction of the inner stator core, and two long edges of each first winding are arranged in two different first bearing grooves respectively.
Compared with the prior art, the double-stator single-rotor permanent magnet synchronous motor provided by the invention has the following advantages:
the invention provides a double-stator single-rotor permanent magnet synchronous motor which comprises an outer motor, a rotor assembly and an inner motor; the rotor assembly comprises a plurality of outer rotor pole shoes and a plurality of inner rotor pole shoes, a cavity is formed inside the outer motor, the inner motor and the rotor assembly are both arranged in the cavity, and the rotor assembly is positioned between the inner motor and the outer motor; a plurality of outer rotor pole shoes are evenly distributed along the circumferential direction of the outer motor, a plurality of inner rotor pole shoes are evenly distributed along the circumferential direction of the inner motor, and gaps are formed between the outer rotor pole shoes and the outer motor and between the inner rotor pole shoes and the inner motor.
From this analysis can know, through motor and rotor subassembly in setting up in the cavity that outer motor formed, make the rotor subassembly be located between interior motor and the outer motor to abundant utilization the cavity that outer motor formed, and then on the basis that does not change the overall dimension and the volume of motor, can improve the torque density of motor to a certain extent, and improve the wholeness ability of motor.
And, because rotor assembly includes inner rotor pole shoe and outer rotor pole shoe in this application, and all be formed with between inner rotor pole shoe and the interior motor and between outer rotor pole shoe and the outer motor and set up the clearance, consequently, rotor assembly in this application both can independently cooperate with interior motor, also can independently cooperate with outer motor to can make the two stator single rotor permanent-magnet synchronous motors that this application provided have the output of three kinds of motionless modes.
When the vehicle is in a light load working condition, the power output can be realized only by supplying power to the inner motor; when the working condition is between light load and heavy load, the power output can be realized only by supplying power to the external motor; when the motor is under heavy load, the inner motor and the outer motor are connected in series and supply power, so that the inner motor and the outer motor act together, the maximum power output is achieved, and the motor is suitable for heavy load conditions.
Because the inside space of the abundant utilization of outer motor of the motor that this application provided, consequently, on the unchangeable basis of assurance volume, can improve the torque density of motor, improve motor efficiency. And, through three kinds of different power output, not only can be better the different operating modes of adaptation, moreover, when one of them trouble of interior motor and outer motor, still can carry out the power supply of certain time through another structure to can improve the fault-tolerant operating capability of motor to a certain extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a double-stator single-rotor permanent magnet synchronous motor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an isolation magnetic ring in a double-stator single-rotor permanent magnet synchronous motor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of relative positions of outer rotor pole shoes and inner rotor pole shoes in a double-stator single-rotor permanent magnet synchronous motor according to an embodiment of the present invention.
In the figure: 1-an external motor; 101-an outer stator core; 102-a first winding; 2-an internal motor; 201-inner stator iron core; 202-a second winding; 3-outer rotor pole shoe; 301-a first air magnetic barrier; 302-a first mating portion; 4-inner rotor pole shoe; 401-a second air magnetic barrier; 402-a second mating portion; 5-a permanent magnet; 6-isolating magnetic ring; 601-a first embedded part; 602-second embedded part.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As used herein, the term "and/or" includes any one of the associated listed items and any combination of any two or more of the items.
For ease of description, spatial relationship terms such as "above 8230; …," upper "," above 8230; \8230;, "below" and "lower" may be used herein to describe the relationship of one element to another element as illustrated in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.
The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.
Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.
The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
As shown in fig. 1, the present invention provides a double-stator single-rotor permanent magnet synchronous motor, which comprises an outer motor 1, a rotor assembly and an inner motor 2; the rotor assembly comprises a plurality of outer rotor pole shoes 3 and a plurality of inner rotor pole shoes 4, a cavity is formed inside the outer motor 1, the inner motor 2 and the rotor assembly are both arranged in the cavity, and the rotor assembly is positioned between the inner motor 2 and the outer motor 1; a plurality of outer rotor pole shoes 3 are evenly arranged along the circumference of the outer motor 1, a plurality of inner rotor pole shoes 4 are evenly arranged along the circumference of the inner motor 2, and gaps are formed between the outer rotor pole shoes 3 and the outer motor 1 and between the inner rotor pole shoes 4 and the inner motor 2.
Compared with the prior art, the double-stator single-rotor permanent magnet synchronous motor provided by the invention has the following advantages:
according to the double-stator single-rotor permanent magnet synchronous motor provided by the invention, the inner motor 2 and the rotor assembly are arranged in the cavity formed by the outer motor 1, so that the rotor assembly is positioned between the inner motor 2 and the outer motor 1, the cavity formed by the outer motor 1 is fully utilized, the torque density of the motor can be improved to a certain extent on the basis of not changing the overall size and volume of the motor, and the overall performance of the motor is improved.
And, because rotor assembly includes inner rotor pole shoe 4 and outer rotor pole shoe 3 among this application, and all be formed with between inner rotor pole shoe 4 and the interior motor 2 and between outer rotor pole shoe 3 and the outer motor 1 and set up the clearance, consequently, rotor assembly in this application both can cooperate with interior motor 2 alone, also can cooperate with outer motor 1 alone to can make the double-stator single-rotor permanent magnet synchronous machine that this application provided have the output of three kinds of motionless modes.
When the vehicle is in a light load working condition, the power output can be realized only by supplying power to the inner motor 2; when the working condition is between light load and heavy load, the power output can be realized only by supplying power to the outer motor 1; when the heavy-load working condition is adopted, the inner motor 2 and the outer motor 1 are required to be connected in series and supply power, so that the common action of the inner motor 2 and the outer motor 1 is realized, the maximum power output is achieved, and the heavy-load working condition is adapted.
Because the motor that this application provided is abundant has utilized 1 inner space of outer motor, consequently, on the unchangeable basis of assurance volume, can improve the torque density of motor, improve motor efficiency. And, through three kinds of different power output, not only can be better the different operating modes of adaptation, moreover, when one of two in interior motor 2 and outer motor 1 breaks down, still can carry out the power supply of certain time through another structure to can improve the fault-tolerant operating capability of motor to a certain extent.
As shown in fig. 1 and fig. 2, the rotor assembly of the present application further includes a magnetism isolating ring 6, and the magnetism isolating ring 6 is located between the outer rotor pole shoe 3 and the inner rotor pole shoe 4.
The magnetism isolating ring 6 in the application is formed by an aluminum material, the magnetism isolating ring 6 is arranged between the inner rotor pole shoe 4 and the outer rotor pole shoe 3, and the magnetism isolating ring 6 in the application is not magnetic conductive, so that the magnetic circuit decoupling between the inner motor 2 and the outer motor 1 can be realized, and the problem that two magnetic fields of the inner motor 2 and the outer motor 1 influence each other when the inner motor 2 and the outer motor 1 operate simultaneously can be reduced to a certain degree.
In order to further enhance the connection strength between the magnetism isolating ring 6 and the inner rotor pole shoe 4 and the outer rotor pole shoe 3, preferably, as shown in fig. 1 to fig. 3, a plurality of first embedding portions 601 are formed on one side of the magnetism isolating ring 6 facing the outer rotor pole shoe 3, and the plurality of first embedding portions 601 are uniformly distributed along the circumferential direction of the magnetism isolating ring 6; a first matching portion 302 is formed at a position of the outer rotor pole shoe 3 corresponding to the first embedding portion 601, and the first matching portion 302 is matched with the first embedding portion 601 so as to connect the outer rotor pole shoe 3 with the magnetism isolating ring 6.
The first embedding part 601 and the first matching part 302 are arranged in a one-to-one correspondence mode in the application, and when the magnetic shield ring is assembled, the first matching part 302 formed by the outer rotor pole shoe 3 towards one side of the magnetic shield ring 6 is embedded into the first embedding part 601 formed by the magnetic shield ring 6 in the application, so that stable connection between the outer rotor pole shoe 3 and the magnetic shield ring 6 can be achieved.
Because the rotor subassembly can produce centrifugal force when moving, consequently, first cooperation portion 302 in this application is for being the dovetail tongue structure, and first portion 601 of establishing of inlaying is the dovetail groove structure to can make outer rotor pole shoe 3 and separate magnetic ring 6 looks joint, and, when the rotor subassembly rotates and produces centrifugal force, can make outer rotor pole shoe 3 and separate the connection between the magnetic ring 6 inseparabler through the structure that this application provided.
Further preferably, as shown in fig. 1 to fig. 3, a plurality of second embedding portions 602 are formed on one side of the magnetism isolating ring 6 facing the inner rotor pole shoe 4, and the plurality of second embedding portions 602 are uniformly distributed along the circumferential direction of the magnetism isolating ring 6; a second matching part 402 is formed at the position of the inner rotor pole shoe 4 corresponding to the second embedded part 602, and the second matching part 402 is matched with the second embedded part 602, so that the inner rotor pole shoe 4 is connected with the magnetism isolating ring 6.
The second embedded part 602 and the second matching part 402 are arranged in a one-to-one correspondence manner, and when the rotor pole shoe 4 is assembled, the second matching part 402 formed by one side of the magnetism isolating ring 6 towards the inner rotor pole shoe 4 is embedded into the second embedded part 602 formed by the magnetism isolating ring 6, so that the stable connection between the inner rotor pole shoe 4 and the magnetism isolating ring 6 can be realized.
Because the rotor subassembly produces centrifugal force when rotating, consequently, through making second cooperation portion 402 be dovetail tongue structure, the second inlays establishes portion 602 and is dovetail groove structure in this application to can make inner rotor pole shoe 4 and separate between the magnetic ring 6 joint mutually, and, when the rotor subassembly rotates and produces centrifugal force, can make outer rotor pole shoe 3 and separate the connection between the magnetic ring 6 inseparabler through the structure that this application provided.
It should be added that, as shown in fig. 2, in the present application, the number of the first embedding portions 601 is the same as that of the second embedding portions 602, and the axes of the adjacent first embedding portions 601 are disposed at an angle to the axis of the second embedding portion 602.
The axis of the first embedded part 601 and the axis of the second embedded part 602 are arranged at an angle, namely the first embedded part 601 and the second embedded part 602 are arranged in a staggered manner, so that the cogging torque of the motor can be weakened, the torque pulsation of the motor can be reduced, the running stability of the motor is improved, and the problem of shaking is solved to a certain extent when the load is reduced.
As shown in fig. 1 and fig. 3, in the present application, a plurality of first air magnetic barriers 301 are formed on the outer rotor pole shoe 3, and the plurality of first air magnetic barriers 301 are symmetrically arranged along the axis of the outer rotor pole shoe 3; a plurality of second air magnetic barriers 401 are formed on the inner rotor pole shoe 4, and the plurality of second air magnetic barriers 401 are symmetrically arranged along the axis of the inner rotor pole shoe 4; the plurality of first air barriers 301 and the plurality of second air barriers 401 are each impregnated with a resin material.
As shown in fig. 3, in the present application, the number of the first air magnetic barriers 301 formed on the outer rotor pole shoe 3 is the same as the number of the second air magnetic barriers 401 formed on the inner rotor pole shoe 4, the first air magnetic barriers 301 on the outer rotor pole shoe 3 are symmetrically arranged along the axis of the outer rotor pole shoe 3, and the second air magnetic barriers 401 on the inner rotor pole shoe 4 are symmetrically arranged along the axis of the inner rotor pole shoe 4, so that the salient pole ratio of the motor can be improved.
It can be understood that the salient pole ratio is the ratio between the q-axis inductance Lq of the motor and the d-axis inductance Ld of the motor, and the ratio between Lq and Ld can be increased by the first air barrier 301 formed on the outer rotor pole shoe 3 and the second air barrier 401 formed on the inner rotor pole shoe 4, so that the content of the reluctance torque in the output torque of the motor can be increased, and the torque density of the motor can be improved.
Because the inside air coefficient of heat conductivity of first air magnetic barrier 301 and second air magnetic barrier 401 is lower, be unfavorable for the rotor subassembly heat dissipation, lead to the inside local temperature rise's of rotor subassembly the higher condition easily, consequently, preferentially, all pour into resin material in first air magnetic barrier 301 and the second air magnetic barrier 401 in this application to can promote the heat conductivility of first air magnetic barrier 301 and second air magnetic barrier 401 to a certain extent, prevent the higher problem of the local temperature rise of rotor subassembly.
It should be added that, in the present application, the outer rotor pole shoe 3 and the inner rotor pole shoe 4 are both formed by sequentially stacking a plurality of silicon steel sheets, the first air magnetic barrier 301 and the second air magnetic barrier 401 are both formed by cutting, and a ratio of a thickness of the first air magnetic barrier 301 to a thickness of the outer rotor pole shoe 3 and a ratio of a thickness of the second air magnetic barrier 401 to a thickness of the inner rotor pole shoe 4 are both 1.
It should be added that, since the inner rotor pole shoe 4 and the outer rotor pole shoe 3 are both formed by stacking a plurality of silicon steel sheets in this application, the thickness of the inner rotor pole shoe 4 and the thickness of the outer rotor pole shoe 3 in this application refer to the thickness of the magnetic conduction layer of the silicon steel sheets.
Further, as shown in fig. 1, permanent magnets 5 are provided between adjacent outer rotor pole pieces 3 and adjacent inner rotor pole pieces 4 in the present application.
Preferably, the permanent magnet 5 in this application is made of neodymium iron boron, and the permanent magnet 5 in this application is magnetized along the tangential direction of the rotor assembly.
Further, as shown in fig. 1, the outer motor 1 of the present application includes an outer stator core 101 and a first winding 102, and the inner motor 2 includes an inner stator core 201 and a second winding 202; a plurality of first bearing grooves are formed in the inner ring wall surface of the outer stator core 101, the first bearing grooves are distributed at equal intervals along the circumferential direction of the inner ring wall surface of the outer stator core 101, the axes of the first bearing grooves extend along the radial direction of the outer stator core 101, and two long sides of each first winding 102 are respectively arranged in two adjacent first bearing grooves; a plurality of second bearing grooves are formed in the outer ring wall surface of the inner stator core 201, the plurality of second bearing grooves are distributed at equal intervals along the circumferential direction of the outer ring wall surface of the inner stator core 201, the axis of each second bearing groove extends along the radial direction of the outer stator core 101, and two long sides of the second winding 202 are respectively arranged in two different second bearing grooves.
Through a plurality of first bearing grooves that this application outer stator core 101 formed, can be stable bear first winding 102, bear the weight of the groove through a plurality of second that inner stator core 201 formed, can be stable bear second winding 202, and, because a plurality of first bearing grooves in this application along outer stator core 101's circumference evenly distributed, a plurality of second bearing grooves along inner stator core 201's circumference evenly distributed, consequently, can make rotor core's relative rotation process more stable and even, stability when improving motor output.
It is understood that the first bearing groove has a rectangular groove structure and the second bearing groove has an approximately rectangular groove structure, and thus, has three axes, the above-mentioned axes extending in the radial direction are the axes of the first and second bearing grooves in the width direction, and the axes of the first and second bearing grooves in the length direction extend in the axial direction of the outer stator core 101 and the inner stator core 201.
It should be added here that both long sides of the first winding 102 and both long sides of the second winding 202 are coil sides on both sides of the winding in the present application.
Preferably, the first winding 102 in this application is a formed winding, the second winding 202 in this application is a loose wire winding, and the open end of the second carrying slot in this application is a furled structure, i.e. a half-closed slot structure, so that the tooth harmonic content can be reduced to some extent, and the low tooth harmonic content can further reduce the torque ripple and the harmonic loss of the motor. And because the shaping winding can't imbed in the half closed slot type structure, consequently, first bearing groove need match the rectangular channel structure and use in this application.
And compared with the traditional scattered wire winding, the formed winding has the advantages of firmness, durability and convenience in wire embedding, so that the formed winding is widely applied to a low-speed direct-drive motor. Because the diameter of the outer motor 1 of the double-stator single-rotor permanent magnet synchronous motor provided by the application is large, the tooth width is wide, and therefore when concentrated windings are adopted, the distance between the left coil side and the right coil side of each formed winding is wide, and the winding machine can be adopted to directly wind out.
And because interior motor 2 arranges the cavity of outer motor 1 in, consequently, interior motor 2's external diameter is less, and the tooth width is also less, and this means if adopt the shaping winding, the distance of two coil sides is very narrow about the shaping winding, and the distance of two coil sides can seriously restrict the bending of shaping winding tip position flat type copper wire about narrower for this kind of shaping winding can't be processed out, consequently, second winding 202 in this application adopts traditional scattered line winding, can realize the assembly forming of whole motor.
It is understood that the first winding 102 and the second winding 202 in this application are three-phase windings, the tail ends of the a phase, the B phase, and the C phase of the first winding 102 are X, Y, and Z, and the tail ends of the a phase, the B phase, and the C phase of the second winding 202 are X, Y, and Z.
Because the motor has torque pulsation in the rotating process, when the torque pulsation is large, the stability of the motor is poor, and the process of dragging the load action is easy to shake, so that the stability of the speed of the motor is influenced, and the energy consumption of the motor is increased. Therefore, to suppress torque ripple in the present application, it is preferable that the first winding 102 be sequentially down-lined in the clockwise direction in the order of A-Z-B-X-C-Y, and the second winding 202 be sequentially down-lined in the clockwise direction in the order of a-Z-B-X-C-Y.
When the motor drives a heavy load, the first winding 102 of the outer motor 1 and the second winding 202 of the inner motor 2 are connected in series, and at this time, the tail end of the phase a of the first winding 102 is X and is connected with the tail end of the phase a of the second winding 202 is X, so that the phase a of the first winding 102 and the phase a of the second winding 202 are connected in series. The same applies to the series connection of the B-phase of the first winding 102 and the B-phase of the second winding 202 and the C-phase of the first winding 102 and the C-phase of the second winding 202. The tail ends of the three phases after being connected in series are connected in a star connection mode, the output three-phase power of the frequency converter is respectively connected to the three phases A, B and C, and the inner motor 1 and the outer motor 1 work simultaneously to drive heavy loads.
When the load torque is smaller than 1/4 rated torque, the tail ends x, y and z of the three-phase winding of the second winding 202 are connected in a star connection mode, the head ends a, b and c are supplied with power by independent frequency converters, and the inner motor 2 works independently.
When the load torque is larger than 1/4 rated torque and smaller than 3/4 rated torque, the tail ends X, Y and Z of the three-phase winding of the first winding 102 are connected in a star connection mode, the head ends A, B and C are supplied with power by independent frequency converters, and the external motor 1 works independently.
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, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A double-stator single-rotor permanent magnet synchronous motor is characterized by comprising an outer motor, a rotor assembly and an inner motor;
the rotor assembly comprises a plurality of outer rotor pole shoes and a plurality of inner rotor pole shoes, a cavity is formed inside the outer motor, the inner motor and the rotor assembly are both arranged in the cavity, and the rotor assembly is positioned between the inner motor and the outer motor;
the outer rotor pole shoes are uniformly distributed along the circumferential direction of the outer motor, the inner rotor pole shoes are uniformly distributed along the circumferential direction of the inner motor, and gaps are formed between the outer rotor pole shoes and the outer motor and between the inner rotor pole shoes and the inner motor.
2. The double-stator single-rotor permanent magnet synchronous motor of claim 1, wherein the rotor assembly further comprises a magnetic isolation ring positioned between the outer rotor pole piece and the inner rotor pole piece.
3. The double-stator single-rotor permanent magnet synchronous motor as claimed in claim 2, wherein a plurality of first embedding portions are formed on one side of the magnetism isolating ring facing the outer rotor pole shoe, and are uniformly distributed along the circumferential direction of the magnetism isolating ring;
a first matching part is formed at the position of the outer rotor pole shoe corresponding to the first embedding part, and the first matching part is matched with the first embedding part so as to connect the outer rotor pole shoe with the magnetism isolating ring.
4. The double-stator single-rotor permanent magnet synchronous motor according to claim 3, wherein a plurality of second embedded portions are formed on one side of the magnetism isolating ring facing the inner rotor pole shoe, and are uniformly distributed along the circumferential direction of the magnetism isolating ring;
and a second matching part is formed at the position of the inner rotor pole shoe corresponding to the second embedding part, and the second matching part is matched with the second embedding part so as to ensure that the inner rotor pole shoe is connected with the magnetism isolating ring.
5. The double-stator single-rotor permanent magnet synchronous motor according to claim 4, wherein the first matching portion and the second matching portion are both in a dovetail type convex groove structure, and the first embedding portion and the second embedding portion are both in a dovetail type concave groove structure.
6. The double-stator single-rotor permanent magnet synchronous motor according to claim 4, wherein the number of the first embedded parts is the same as that of the second embedded parts, and the axes of the adjacent first embedded parts and the axes of the adjacent second embedded parts are arranged at an angle.
7. The double-stator single-rotor permanent magnet synchronous motor according to claim 1, wherein a plurality of first air magnetic barriers are formed on the outer rotor pole shoe, and are symmetrically arranged along the axis of the outer rotor pole shoe;
a plurality of second air magnetic barriers are formed on the inner rotor pole shoe and are symmetrically arranged along the axis of the inner rotor pole shoe;
and resin materials are poured into the first air magnetic barriers and the second air magnetic barriers.
8. The double-stator single-rotor permanent magnet synchronous motor according to claim 7, wherein the outer rotor pole shoe and the inner rotor pole shoe are both formed by sequentially stacking a plurality of silicon steel sheets, the first air magnetic barrier and the second air magnetic barrier are both formed by cutting, and the ratio of the thickness of the first air magnetic barrier to the thickness of the outer rotor pole shoe and the ratio of the thickness of the second air magnetic barrier to the thickness of the inner rotor pole shoe are both 1.
9. A double stator single rotor permanent magnet synchronous machine according to claim 7, wherein permanent magnets are provided between adjacent outer rotor pole pieces and adjacent inner rotor pole pieces.
10. A double stator single rotor permanent magnet synchronous machine according to claim 1, wherein said outer machine comprises an outer stator core and a first winding, and said inner machine comprises an inner stator core and a second winding;
a plurality of first bearing grooves are formed in the inner ring wall surface of the outer stator core, the first bearing grooves are distributed at equal intervals along the circumferential direction of the inner ring wall surface of the outer stator core, the axis of each first bearing groove extends along the radial direction of the outer stator core, and two long sides of each first winding are respectively arranged in two adjacent first bearing grooves;
the inner stator core comprises an outer ring wall surface, a plurality of first bearing grooves are formed in the outer ring wall surface of the inner stator core, the first bearing grooves are distributed at equal intervals along the circumferential direction of the outer ring wall surface of the inner stator core, the axis of each first bearing groove extends along the radial direction of the inner stator core, and two long edges of each first winding are arranged in two different first bearing grooves respectively.
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| CN202211052263.8A CN115296501A (en) | 2022-08-30 | 2022-08-30 | Double-stator single-rotor permanent magnet synchronous motor |
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| CN202211052263.8A CN115296501A (en) | 2022-08-30 | 2022-08-30 | Double-stator single-rotor permanent magnet synchronous motor |
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| CN104734440A (en) * | 2015-03-19 | 2015-06-24 | 江门职业技术学院 | Double-stator magnetic resistance type angle sensor |
| CN208986796U (en) * | 2018-09-21 | 2019-06-14 | 沈阳工业大学 | A kind of composite fabricated rotor double-stator synchronous machine |
| CN209435081U (en) * | 2018-09-21 | 2019-09-24 | 沈阳工业大学 | Double-stator permanent magnet assists cage barrier rotors synchronous motor |
| CN212086040U (en) * | 2020-05-14 | 2020-12-04 | 齐鲁工业大学 | Double-stator switched reluctance motor |
| CN215528727U (en) * | 2021-09-23 | 2022-01-14 | 河北新四达电机股份有限公司 | Mounting structure of permanent magnet in double-stator permanent magnet motor and motor |
| CN216959629U (en) * | 2021-12-28 | 2022-07-12 | 淮阴工学院 | Double-stator flux reversing motor with Halbach permanent magnet array |
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2022
- 2022-08-30 CN CN202211052263.8A patent/CN115296501A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734440A (en) * | 2015-03-19 | 2015-06-24 | 江门职业技术学院 | Double-stator magnetic resistance type angle sensor |
| CN208986796U (en) * | 2018-09-21 | 2019-06-14 | 沈阳工业大学 | A kind of composite fabricated rotor double-stator synchronous machine |
| CN209435081U (en) * | 2018-09-21 | 2019-09-24 | 沈阳工业大学 | Double-stator permanent magnet assists cage barrier rotors synchronous motor |
| CN212086040U (en) * | 2020-05-14 | 2020-12-04 | 齐鲁工业大学 | Double-stator switched reluctance motor |
| CN215528727U (en) * | 2021-09-23 | 2022-01-14 | 河北新四达电机股份有限公司 | Mounting structure of permanent magnet in double-stator permanent magnet motor and motor |
| CN216959629U (en) * | 2021-12-28 | 2022-07-12 | 淮阴工学院 | Double-stator flux reversing motor with Halbach permanent magnet array |
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