CN111181271A - Double-stator staggered rotor tooth magnetic flux switching type permanent magnet motor and electromagnetic equipment - Google Patents
Double-stator staggered rotor tooth magnetic flux switching type permanent magnet motor and electromagnetic equipment Download PDFInfo
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- CN111181271A CN111181271A CN202010116355.2A CN202010116355A CN111181271A CN 111181271 A CN111181271 A CN 111181271A CN 202010116355 A CN202010116355 A CN 202010116355A CN 111181271 A CN111181271 A CN 111181271A
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- 230000005389 magnetism Effects 0.000 claims description 5
- 239000012071 phase Substances 0.000 claims 4
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- 238000004519 manufacturing process Methods 0.000 abstract description 4
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- 229910052742 iron Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
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- 230000004323 axial length Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
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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
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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
- H02K1/14—Stator cores with salient poles
- H02K1/141—Stator cores with salient poles consisting of C-shaped cores
- H02K1/143—Stator cores with salient poles consisting of C-shaped cores of the horse-shoe type
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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
- H02K1/17—Stator cores with permanent magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- 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
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/18—Windings for salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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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
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
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Abstract
The invention belongs to the field of motor design and manufacture, and provides a double-stator staggered rotor tooth flux switching type permanent magnet motor and electromagnetic equipment, which solve the problem that the existing flux switching type permanent magnet motor is inconsistent in torque density improvement and torque ripple inhibition, and have the effects of high power density, strong overload capacity, low tooth space torque, low torque ripple and suitability for modular manufacture. Wherein the motor comprises an inner stator arranged inside the rotor; an outer stator disposed outside the rotor; the inner side and the outer side of the rotor are respectively and uniformly provided with a plurality of inner rotor teeth and outer rotor teeth which are arranged in a staggered mode, permanent magnetic flux is alternately polymerized on inner and outer air gaps of the rotor to improve torque density, and torque pulsation is inhibited by superposition of torque components generated by the inner and outer air gaps of the rotor.
Description
Technical Field
The invention belongs to the field of motor design and manufacture, and particularly relates to a double-stator staggered rotor tooth magnetic flux switching type permanent magnet motor and electromagnetic equipment.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Permanent magnet motors can be classified into permanent magnet stator type motors and permanent magnet rotor type motors according to the difference in the placement positions of the permanent magnets of the permanent magnet motors. Permanent magnets are placed on a motor stator by the permanent magnet stator type motor finger, and permanent magnets are placed on a rotor by the permanent magnet rotor type motor finger. In current industrial applications, permanent magnet rotor type machines dominate. The permanent magnet rotor type motor can be divided into a surface-mounted type and a built-in type according to different placement forms of the permanent magnets on the rotor. However, for a surface-mounted permanent magnet motor, magnetic lines of force of an armature reaction magnetic field directly and radially pass through a permanent magnet vertically when the permanent magnet is loaded, and under the load condition of low speed and large torque, the armature current is large when the permanent magnet is loaded, the armature reaction is strong, and the permanent magnet often faces a great irreversible demagnetization risk. For a built-in permanent magnet motor, the permanent magnet is arranged in the rotor and rotates along with the rotor, so that heat dissipation is difficult, and temperature rise of the rotor is a main factor for limiting the overload capacity of the motor. On the contrary, the armature reaction magnetic line of force of the permanent magnet stator type motor does not directly and vertically pass through the permanent magnet, and the permanent magnet is arranged on the static stator, so that the working temperature of the permanent magnet can be effectively reduced only by installing a proper forced heat dissipation cooling system at the stator.
The common permanent magnet stator type motor is mainly a magnetic flux switching type permanent magnet motor, and the working principle of the motor is based on the magnetic flux switching principle and the minimum reluctance principle. The traditional magnetic flux switching type permanent magnet motor is formed by sequentially and closely assembling a plurality of U-shaped iron cores and a plurality of permanent magnets. The permanent magnet is placed between two adjacent U-shaped iron cores, and the rotor is formed by only silicon steel sheets in an overlying mode. The winding is usually centralized, and the winding coil is wound on a sandwich structure formed by U-shaped iron core teeth-permanent magnets-U-shaped iron core teeth. Because the concentrated windings on the flux-switching permanent magnet motor have consistency and complementarity, the counter-electromotive force in each coil and the even harmonic components of the permanent magnet flux linkage can be completely cancelled, so that the flux linkage and the counter-electromotive force with low harmonic distortion rate can be obtained. In addition, the magnetizing directions of the adjacent permanent magnets of the motor are opposite, so that the function of focusing magnetic flux can be generated, the air gap magnetic flux density is improved, and higher torque density can be generated. Nevertheless, since this type of motor is a doubly salient structure, the motor has disadvantages of high cogging torque and torque ripple, and vibration and noise are inevitably generated.
The inventors found that although cogging torque and torque ripple can be reduced to some extent by cutting permanent magnets, slanting pole skewed slots, optimizing tooth shapes, or using a complicated driving algorithm, a drop in output torque cannot be avoided and manufacturing difficulty increases, and thus, the conventional flux switching type permanent magnet motor has a problem in that both torque density increase and torque ripple suppression are incompatible.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides a double-stator staggered rotor tooth flux switching type permanent magnet motor, which adopts a staggered arrangement structure of inner rotor teeth and outer rotor teeth to realize alternate aggregation of permanent magnet flux on inner and outer air gaps, improves torque density, and effectively suppresses torque ripple through superposition of torque components generated by the double air gaps.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-stator dislocation rotor tooth flux switching type permanent magnet motor comprises:
an inner stator disposed inside the rotor;
an outer stator disposed outside the rotor;
the inner side and the outer side of the rotor are respectively and uniformly provided with a plurality of inner rotor teeth and outer rotor teeth which are arranged in a staggered mode, permanent magnetic flux is alternately polymerized on inner and outer air gaps of the rotor to improve torque density, and torque pulsation is inhibited by superposition of torque components generated by the inner and outer air gaps of the rotor.
As an embodiment, the inner stator comprises a plurality of inner stator U-shaped iron core units, inner stator permanent magnets and inner stator windings; the inner stator permanent magnet is arranged between two adjacent inner stator U-shaped iron core units; the outer stator winding adopts a multi-coil-phase centralized winding and can be independently controlled.
The technical scheme has the advantages that the winding coefficient is improved and the end windings are reduced by adopting the multi-coil-phase centralized winding, so that the torque density is obviously improved and the realization of modular design is facilitated.
As an embodiment, the inner stator U-shaped core unit includes an inner stator inter-phase U-shaped core unit and an inner stator in-phase U-shaped core unit, and one inner stator inter-phase U-shaped core unit is disposed at every several inner stator in-phase U-shaped core units arranged at intervals in a circumferential direction of the inner stator to implement a stator modular design.
In one embodiment, the magnetizing direction of the permanent magnet of the inner stator is circumferential tangential, and the magnetizing directions of two adjacent permanent magnets on the inner stator are opposite, so that a magnetism gathering effect is generated, and the air gap flux density is increased.
The technical scheme has the advantages that the direction of the armature reaction magnetic field generated when the inner stator winding is electrified is vertical to the magnetizing direction of the inner stator permanent magnet, and the motor has high bearing capacity on irreversible demagnetization of the permanent magnet under heavy load, so that the motor has high overload capacity.
In one embodiment, the permanent magnet of the inner stator has a cylindrical structure with a fan-shaped bottom surface or a rectangular bottom surface and is arranged in a spoke shape.
As an embodiment, the outer stator comprises a plurality of outer stator U-shaped iron core units, outer stator permanent magnets and outer stator windings; the outer stator permanent magnet is arranged between two adjacent inner stator U-shaped iron core units; the outer stator winding adopts a multi-coil-phase centralized winding and can be independently controlled.
The technical scheme has the advantages that the winding coefficient is improved and the end windings are reduced by adopting the multi-coil-phase centralized winding, so that the torque density is obviously improved and the realization of modular design is facilitated.
As an embodiment, the outer stator U-shaped core unit comprises an outer stator inter-phase U-shaped core unit and an outer stator inter-phase U-shaped core unit, and one outer stator inter-phase U-shaped core unit is arranged at intervals in the circumferential direction of the outer stator for realizing the stator modular design.
In one embodiment, the magnetizing direction of the outer stator permanent magnet is circumferential tangential, and the magnetizing directions of two adjacent permanent magnets on the outer stator are opposite, so that a magnetism gathering effect is generated, and the air gap flux density is increased.
The technical scheme has the advantages that when the direction of a magnetic field generated by electrifying the outer stator winding is vertical to the magnetizing direction of the outer stator permanent magnet, the motor has high bearing capacity on irreversible demagnetization of the permanent magnet under heavy load, and therefore the motor has high overload capacity.
In one embodiment, the number and width of the inner rotor teeth and the outer rotor teeth are equal, and the inner rotor teeth and the outer rotor teeth are staggered by one rotor tooth width in the circumferential direction.
In order to solve the above problems, a second aspect of the present invention provides an electromagnetic apparatus including a double-stator offset rotor tooth flux switching type permanent magnet motor, in which an inner rotor tooth and an outer rotor tooth are offset arranged to alternately converge a permanent magnet flux on inner and outer air gaps, thereby increasing torque density, and effectively suppressing torque ripple by superimposing torque components generated by the double air gaps.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electromagnetic device comprises the double-stator staggered rotor tooth flux switching type permanent magnet motor.
The invention has the beneficial effects that:
(1) the structure that the inner rotor teeth and the outer rotor teeth are arranged in a staggered mode is adopted, permanent magnetic flux is alternately converged on the inner air gaps and the outer air gaps of the rotor to improve torque density, and torque pulsation is suppressed by superposing torque components generated by the inner air gaps and the outer air gaps of the rotor.
(2) The inner stator winding and the outer stator winding both adopt multi-coil-phase centralized windings, so that the winding coefficient is improved, end windings are reduced, the torque density is obviously improved, and the realization of modular design is facilitated.
(3) The inner stator winding and the outer stator winding can be independently controlled and respectively and independently operated, so that higher fault tolerance capability is obtained.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic two-dimensional structure diagram of a double-stator staggered rotor tooth flux switching type permanent magnet motor according to an embodiment of the invention.
Fig. 2 is a schematic view of a rotor structure according to an embodiment of the present invention.
Fig. 3 is a schematic circumferential development view of a double-stator staggered rotor tooth flux switching type permanent magnet motor according to an embodiment of the present invention.
Fig. 4(a) is a schematic structural diagram of an outer stator interphase U-shaped core unit according to an embodiment of the present invention.
Fig. 4(b) is a schematic structural view of the U-shaped core unit in the outer stator phase according to the embodiment of the present invention.
Fig. 4(c) is a schematic structural diagram of an inter-stator U-shaped core unit according to an embodiment of the present invention.
Fig. 4(d) is a schematic structural view of a U-shaped core unit in the inner stator phase according to the embodiment of the present invention.
Fig. 5(a) is a schematic magnetic circuit diagram of the inner rotor teeth and the inner stator teeth of the embodiment of the present invention.
Fig. 5(b) is a schematic view of a magnetic circuit of the rotor of the embodiment of the present invention rotated through 90 electrical degrees.
Fig. 5(c) is a schematic view of a magnetic circuit of a rotor of an embodiment of the present invention rotated through 180 electrical degrees.
Fig. 6 is a structural assembly schematic diagram of a double-stator staggered rotor tooth flux switching type permanent magnet motor according to an embodiment of the invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
Example one
As shown in fig. 1, the double-stator staggered rotor tooth flux switching permanent magnet motor of the present embodiment includes an inner stator, an outer stator, and a rotor.
Wherein the inner stator is arranged inside the rotor 3; the inner stator comprises an inner stator U-shaped iron core unit 2, an inner stator permanent magnet and an inner stator winding 6; the outer stator is arranged outside the rotor 3; the outer stator comprises an outer stator U-shaped iron core unit 1, an outer stator permanent magnet 4 and an outer stator winding 5. The outer stator winding 5 and the inner stator winding 6 both adopt multi-coil-phase centralized windings and can be independently controlled; the inner stator permanent magnet is arranged between two adjacent inner stator U-shaped iron core units and is closely attached; the stator permanent magnet is arranged between two adjacent stator U-shaped iron core units and is closely attached. The inner stator and the outer stator are both provided with axial holes 7.
And the rotor 3 is formed by laminating silicon steel sheets and is positioned between the inner stator and the outer stator.
Dislocation structure: as shown in fig. 2, a plurality of inner rotor teeth and outer rotor teeth are uniformly distributed on the inner side and the outer side of the rotor, and the inner rotor teeth and the outer rotor teeth are arranged in a staggered manner. The number and the width of the inner rotor teeth and the outer rotor teeth are equal, and the inner rotor teeth and the outer rotor teeth are staggered by one rotor tooth width in the circumferential direction. Width theta of rotor slot1And rotor tooth width θ2Satisfies the relation theta1＝3θ2。
As shown in fig. 3, the motor is spread out in the circumferential direction in order to specifically explain the size constraints and winding arrangement of the present embodiment. The magnetizing directions of two adjacent permanent magnets on the same side are opposite, so that the magnetism gathering effect is realized. The outer stator U-shaped iron core unit 1 comprises an outer stator interphase U-shaped iron core unit 1.1 and an outer stator interphase U-shaped iron core unit 1.2. The inner stator U-shaped iron core unit 2 comprises an inner stator interphase U-shaped iron core unit 2.1 and an inner stator interphase U-shaped iron core unit 2.2. The circumferential sizes of the outer stator interphase U-shaped iron core unit 1.1 and the inner stator interphase U-shaped iron core unit 2.1 are completely the same; the circumferential sizes of the outer stator phase inner U-shaped iron core unit 1.2 and the inner stator phase inner U-shaped iron core unit 2.2 are completely the same; rotor tooth width theta1Tooth width w of stator1Groove width w of U-shaped iron core unit of phase-locked stator2Width w of permanent magnet3Inter-phase stator U-shaped iron core unit groove width w4Satisfies the relation theta1＝w1＝w2＝w3＝3/5w4。
The outer stator winding 5 and the inner stator winding 6 are respectively and correspondingly arranged in the outer stator slot and the inner stator slot; the outer stator winding 5 and the inner stator winding 6 adopt multi-coil-phase centralized windings; the multi-coil phase group centralized winding comprises a plurality of phase groups, each coil of each phase group is respectively wound on a sandwich structure formed by the stator teeth, the permanent magnets and the stator teeth, and the coils of the plurality of phase groups are all connected in series on a circuit. In this example, 2 phase groups are used, each containing 6 coils. 6 coils of a first phase group of the A phase are sequentially wound on 6 sandwich structures, 6 coils of a second phase group of the A phase are sequentially wound on 6 sandwich structures on the opposite side of the circumference of the first phase group, and 12 coils of all the A phase groups are connected in series, so that flux linkages in the 12 coils are identical in phase, even-numbered harmonics of the flux linkages are mutually offset, and a modular structure is realized. In a similar way, the phase B winding and the phase C winding are respectively arranged on a sandwich structure after 1 phase of the phase A winding is separated from the U-shaped iron core unit slot of the phase stator, so that the phase A, B, C windings are sequentially different by a phase angle of 120 degrees.
Referring to fig. 4(a) and 4(b), the outer stator phase U-shaped core unit 1.1 is the same size in the radial and axial directions as the outer stator phase inner U-shaped core unit 1.2, except for the difference in the slot width within the unit. In the radial direction, the yoke width h of the U-shaped iron core unit between the outer stator phases1Groove depth h2Unit radial length h3Satisfies the relation h3＝h1+h2. Radial length h of outer stator interphase U-shaped iron core unit3And the axial length l is a non-critical parameter and is determined according to a motor power size equation. Yoke width h of the unit1And selecting properly according to designed working conditions.
Referring to fig. 4(c) and 4(d), the inner stator inter-phase U-shaped core unit 2.1 is the same size in the radial and axial directions as the inner stator inter-phase U-shaped core unit 2.2, except for the difference in the slot width within the unit. In the radial direction, the width h of the yoke of the U-shaped iron core unit between the inner stator phases4Groove depth h5And the radial length h of the U-shaped iron core unit between the inner stator and the outer stator6Satisfies the relation h6＝h4+h6. Radial length h of inter-stator U-shaped iron core unit6And the axial length l is a non-critical parameter and is determined according to a motor power size equation. Yoke width h of inter-stator U-shaped iron core unit4And selecting properly according to designed working conditions.
The operation principle of the double-stator staggered rotor tooth flux switching type permanent magnet motor is based on a flux switching principle and a reluctance minimum principle; the principle of torque density improvement and cogging torque weakening of the double-stator staggered rotor tooth flux switching type permanent magnet motor of the embodiment is as follows:
when only one phase is considered, when the outer rotor teeth are aligned with the outer stator U-shaped core unit teeth, the two permanent magnets adjacent to the outer stator U-shaped core unit teeth focus all magnetic fluxes in an outer air gap through a magnetic convergence effect, so that the outer air gap magnetic flux density is enhanced. After the rotor rotates by 90 degrees of electric angle (namely, one rotor tooth width), the inner rotor tooth part is aligned with the inner stator U-shaped iron core unit tooth part, and the two permanent magnets adjacent to the inner stator U-shaped iron core unit tooth part focus all magnetic flux in the inner air gap through the magnetic concentration effect, so that the inner air gap magnetic flux density is enhanced. Therefore, compared with a traditional single-air-gap flux switching type permanent magnet motor, the double-stator design can fully utilize the inner space of the motor, so that the torque density is improved.
Due to the staggered design of the inner and outer teeth of the rotor, under the condition of no load, the phase of the wave function of the magnetic flux density of the outer air gap and the phase of the wave function of the magnetic flux density of the inner air gap always ensure opposite phases. Therefore, when the rotor continuously moves, the cogging torque received by the outer rotor teeth is opposite to the cogging torque received by the inner rotor teeth all the time, the wave crests of the two cogging torques are offset with the wave troughs, the cogging torque received by the whole rotor is greatly weakened, and the torque pulsation is reduced.
The specific operation principle is as follows:
referring to fig. 5(a), the first inner rotor teeth 12 are now facing the first inner stator teeth 11. The magnetic flux generated by the first inner stator permanent magnet 8 is focused on the first inner stator teeth 11 together with the magnetic flux generated by the second inner stator permanent magnet 9 through the inner stator iron yoke 10. This collective magnetic flux passes through the first inner stator tooth 11-inner air gap-first inner rotor tooth 12-rotor iron yoke 13-second inner rotor tooth 14-inner air gap-second inner stator tooth 15, and a final portion of the magnetic flux returns to the first inner stator permanent magnet 8. The permanent magnet flux in the inner stator coil 16 is now at a positive maximum.
Referring to fig. 5(b), the rotor has rotated one tooth width (90 electrical degrees) with the first outer rotor teeth 17 facing the first outer stator teeth 18. The magnetic flux generated by the second outer stator permanent magnet 20 passes through the outer stator iron yoke 21 to be focused on the first outer stator teeth 18 together with the magnetic flux generated by the first outer stator permanent magnet 19. This collective magnetic flux passes through the first outer stator tooth 18-the outer air gap-the first outer rotor tooth 17-the rotor iron yoke 13-the second outer rotor tooth 22-the outer air gap-the second outer stator tooth 23, and finally a portion back to the second outer stator permanent magnet 20. The permanent magnet flux in the inner stator coil 16 is now 0 and the permanent magnet flux in the outer stator coil 24 reaches a positive maximum.
Referring to fig. 5(c), the rotor has rotated two tooth widths (180 electrical degrees) with the first inner rotor tooth 12 facing the third inner stator tooth 25. The magnetic flux generated by the second inner stator permanent magnet 9 passes through the inner stator iron yoke 10 to be focused on the second inner stator teeth 25 together with the magnetic flux generated by the first inner stator permanent magnet 8. This collective magnetic flux passes through the third inner stator tooth 25-the inner air gap-the first inner rotor tooth 12-the rotor iron yoke 13-the third inner rotor tooth 26-the fourth inner stator tooth 27, and finally a part returns to the second inner stator permanent magnet 9. At this time the permanent magnet flux in the inner stator coil 16 reaches a negative maximum and the permanent magnet flux in the outer stator coil 24 is 0. The rotor continues to rotate, and the permanent magnet magnetic flux alternately switches among the three loops repeatedly, so that the magnetic flux switching process is realized. According to such a flux switching principle, three-phase back electromotive forces of low harmonic distortion rates that are 90 ° out of phase in electrical angle are induced in the inner stator winding and the outer stator winding, respectively.
The embodiment adopts a double-stator structure, the outer side teeth and the inner side teeth of the rotor are staggered by one tooth width (90 degrees of electric angle), and the special structure of the interphase iron core unit and the relationship among the reasonable constraint iron core unit size, the permanent magnet size and the rotor size are introduced, so that when the rotor moves, the permanent magnet flux is only alternately interlinked with the stator winding on one side, the air gap flux density is increased, and the torque density is improved.
The outer stator winding and the inner stator winding adopt multi-coil-phase centralized windings, the copper consumption of the end part can be obviously reduced, the winding coefficient is improved, and the modularized design is realized by combining a double-stator structure and a rotor staggered tooth structure. Furthermore, the ingenious staggered tooth design and size constraint relation ensures that the wave functions of the air gap flux density at the inner side and the outer side always ensure the opposite phase, so that the cogging torque of the outer rotor teeth and the cogging torque of the inner rotor teeth are mutually offset when the rotor is in no-load, the integral cogging torque of the rotor can be greatly weakened, and the torque pulsation is reduced. Because the dislocation tooth structure causes the three-phase back electromotive force of the inner stator winding and the outer stator winding to have a 90-degree electrical angle difference, the inner stator winding and the outer stator winding can be connected to two inverters with the 90-degree electrical angle difference in phase, and therefore fault tolerance is improved.
Example two
The present embodiment provides an electromagnetic apparatus as described in the first embodiment, where the electromagnetic apparatus includes a double-stator staggered rotor tooth flux switching type permanent magnet motor, and the staggered arrangement structure of the inner rotor teeth and the outer rotor teeth is adopted to achieve the alternating aggregation of the permanent magnet flux on the inner and outer air gaps, so as to improve the torque density, and effectively suppress the torque ripple by superimposing the torque components generated by the double air gaps.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a two stator dislocation rotor tooth magnetic flux switching type permanent-magnet machine which characterized in that includes:
an inner stator disposed inside the rotor;
an outer stator disposed outside the rotor;
the inner side and the outer side of the rotor are respectively and uniformly provided with a plurality of inner rotor teeth and outer rotor teeth which are arranged in a staggered mode, permanent magnetic flux is alternately polymerized on inner and outer air gaps of the rotor to improve torque density, and torque pulsation is inhibited by superposition of torque components generated by the inner and outer air gaps of the rotor.
2. The double stator offset rotor tooth flux switching type permanent magnet motor according to claim 1, wherein the inner stator comprises a plurality of inner stator U-shaped core units, inner stator permanent magnets and inner stator windings; the inner stator permanent magnet is arranged between two adjacent inner stator U-shaped iron core units; the inner stator winding adopts a multi-coil-phase centralized winding and can be independently controlled.
3. The double-stator offset rotor tooth flux switching type permanent magnet motor according to claim 2, wherein the inner stator U-shaped core unit comprises an inner stator inter-phase U-shaped core unit and an inner stator phase U-shaped core unit, and one inner stator inter-phase U-shaped core unit is disposed at every several inner phase U-shaped core units arranged at intervals in a circumferential direction of the inner stator to realize a stator modular design.
4. The double-stator staggered rotor tooth flux switching type permanent magnet motor according to claim 2, wherein the magnetizing direction of the permanent magnets of the inner stator is circumferential tangential, and the magnetizing directions of two adjacent permanent magnets on the inner stator are opposite, so that a magnetism gathering effect is generated, and the air gap flux density is increased.
5. The double-stator offset rotor tooth flux switching type permanent magnet motor according to claim 2, wherein the inner stator permanent magnets are in a cylindrical structure with a fan-shaped bottom surface or a rectangular bottom surface and arranged in a spoke shape.
6. The double-stator offset rotor tooth flux switching type permanent magnet motor according to any one of claims 1 to 5, wherein the outer stator comprises a plurality of outer stator U-shaped core units, outer stator permanent magnets and outer stator windings; the outer stator permanent magnet is arranged between two adjacent outer stator U-shaped iron core units; the outer stator winding adopts a multi-coil-phase centralized winding and can be independently controlled.
7. The double-stator offset rotor tooth flux switching type permanent magnet motor according to claim 6, wherein the outer stator U-shaped core unit comprises an outer stator inter-phase U-shaped core unit and an outer stator phase inner U-shaped core unit, and one outer stator inter-phase U-shaped core unit is arranged at intervals in the circumferential direction of the outer stator for realizing stator modular design.
8. The double-stator staggered rotor tooth flux switching type permanent magnet motor according to claim 6, wherein the magnetizing directions of the outer stator permanent magnets are circumferential tangential, and the magnetizing directions of two adjacent permanent magnets on the outer stator are opposite, so that a magnetism gathering effect is generated, and the air gap flux density is increased.
9. The double-stator offset rotor tooth flux switching type permanent magnet motor according to claim 1, wherein the number and width of the inner rotor teeth and the outer rotor teeth are equal, and the inner rotor teeth and the outer rotor teeth are offset from each other by one rotor tooth width in the circumferential direction.
10. Electromagnetic apparatus, comprising a double stator offset rotor teeth flux switching type permanent magnet machine according to any of claims 1-9.
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| CN202010116355.2A CN111181271B (en) | 2020-02-25 | 2020-02-25 | Double-stator misplaced rotor tooth magnetic flux switching type permanent magnet motor and electromagnetic equipment |
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Citations (5)
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|---|---|---|---|---|
| CN103647382A (en) * | 2013-12-27 | 2014-03-19 | 南京航空航天大学 | Double-stator high-power-density flux switching permanent magnet motor |
| JP2014176137A (en) * | 2013-03-06 | 2014-09-22 | Ihi Corp | Double stator type switched reluctance rotating machine |
| CN110165852A (en) * | 2019-06-19 | 2019-08-23 | 山东大学 | A kind of bimorph transducer phase group concentration coiling magneticfocusing permanent-magnetism linear motor |
| CN110429778A (en) * | 2019-08-31 | 2019-11-08 | 郑州大学 | A kind of electronic automobile-used U-shaped double-stator structure switched reluctance machines |
| CN110504811A (en) * | 2019-09-12 | 2019-11-26 | 山东大学 | A kind of dislocation birotor Magneticflux-switching type magneto and generating equipment |
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2020
- 2020-02-25 CN CN202010116355.2A patent/CN111181271B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014176137A (en) * | 2013-03-06 | 2014-09-22 | Ihi Corp | Double stator type switched reluctance rotating machine |
| CN103647382A (en) * | 2013-12-27 | 2014-03-19 | 南京航空航天大学 | Double-stator high-power-density flux switching permanent magnet motor |
| CN110165852A (en) * | 2019-06-19 | 2019-08-23 | 山东大学 | A kind of bimorph transducer phase group concentration coiling magneticfocusing permanent-magnetism linear motor |
| CN110429778A (en) * | 2019-08-31 | 2019-11-08 | 郑州大学 | A kind of electronic automobile-used U-shaped double-stator structure switched reluctance machines |
| CN110504811A (en) * | 2019-09-12 | 2019-11-26 | 山东大学 | A kind of dislocation birotor Magneticflux-switching type magneto and generating equipment |
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| CN111181271B (en) | 2023-12-19 |
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