CN115347753A - Double-stator motor based on excitation source synchronous and asynchronous double modulation - Google Patents

Double-stator motor based on excitation source synchronous and asynchronous double modulation Download PDF

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CN115347753A
CN115347753A CN202210835173.XA CN202210835173A CN115347753A CN 115347753 A CN115347753 A CN 115347753A CN 202210835173 A CN202210835173 A CN 202210835173A CN 115347753 A CN115347753 A CN 115347753A
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stator
double
modulation
motor
inner stator
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王宇
陈凯
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Nanjing University of Aeronautics and Astronautics
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Nanjing University of Aeronautics and Astronautics
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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
    • 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
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • 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
    • H02K1/27—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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/02—Details
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Power Engineering (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

The invention discloses a double-stator motor based on excitation source synchronous and asynchronous double modulation.A outer stator is uniformly provided with 12 teeth along the circumferential direction, and a discharge armature winding is embedded in an outer stator slot; the rotor is formed by connecting 10 magnetic conduction blocks and 10 permanent magnetic blocks which are magnetized outwards and radially in a staggered mode along the circumferential direction; the inner stator is provided with 12 teeth along the circumferential direction, tangential magnetizing permanent magnets are embedded between the notches of the inner stator, and the magnetizing directions of two adjacent notch permanent magnets are opposite; the tooth part of the inner stator is wound with a direct current centralized excitation winding, the excitation winding and the permanent magnet in the rotor are jointly used as an excitation source of the motor, no relative motion exists between the magnetic conduction block and the rotor permanent magnet, synchronous modulation is introduced, the magnetic conduction block and the direct current excitation winding of the inner stator have relative motion, and asynchronous modulation is introduced. The invention has the characteristics of large output power, wide magnetic field regulating range, high space utilization rate of the motor, high power density and the like, does not increase the axial length of the motor and the volume of the motor, and has the coexistence of synchronous modulation and asynchronous modulation in the same two-dimensional plane.

Description

Double-stator motor based on excitation source synchronous and asynchronous double modulation
Technical Field
The invention belongs to the technical field of motor body design, and particularly relates to a double-stator motor based on excitation source synchronous and asynchronous double modulation, which is suitable for the fields of automobile power generation, wind power generation and the like.
Background
The traditional permanent magnet generator has no excitation loss under the condition of eliminating an electric brush and a slip ring, and has the advantages of simple structure, high reliability, small volume and high efficiency, but the permanent magnet generator has the difficulty in keeping constant output voltage due to the fact that a permanent magnet field is fixed and difficult to adjust when the load, the rotating speed, the temperature and the like change. The electric excitation synchronous generator can adjust the air gap magnetic field by adjusting the current of the excitation winding, thereby being convenient to adjust the output voltage. The hybrid excitation generator introduces an electric excitation winding on the basis of the permanent magnet motor, so that the advantages of the permanent magnet motor are kept, and the effects of smoothness and adjustability of an air gap magnetic field of the motor and convenience for maintaining stable output voltage can be achieved.
The traditional rotor permanent magnet type hybrid excitation motor has the advantages that as the excitation winding is placed on the side of the rotor, an electric brush, a slip ring or an electronic rectifier device and the like are introduced, so that the reliability is reduced; in the traditional stator permanent magnet type hybrid excitation motor, because the phenomena of serious space conflict, winding cross coupling and the like can be caused when an excitation winding, an armature winding and a permanent magnet are simultaneously placed ON a stator, Z.Q.Zhu (all self-strength) teaches and the like that in 2015, in a paper "Novel electric coils having separated PM excitation state" of the IEEE TRANSACTIONMAGNETICS in No. 51 and No. 5, a stator permanent magnet motor structure adopting stator partitions is provided, wherein the armature winding is positioned ON an outer region stator, and the permanent magnet is positioned ON an inner region stator, so that the space conflict between the armature winding and the permanent magnet is solved, the temperature rise of the stator is relieved, and the working stability of the permanent magnet is improved.
However, the magnetic adjusting block added to the middle rotor in the above-mentioned partitioned stator motor model is composed of a magnetic conducting block and a non-magnetic conducting block, and the main modulation mode is asynchronous modulation, so that it is difficult to achieve ideal output power when the motor operates in a power generation state and a low-voltage large current is output, and thus a hybrid excitation claw pole motor structure is proposed. Document 202220864655.3 (application number 5363) based on a stator full-slot structure adopts a parallel structure, so that the output power of the hybrid excitation motor is improved. This configuration, however, requires an increase in the axial length of the motor to increase synchronous modulation and does not take full advantage of motor space.
Disclosure of Invention
In order to solve the above mentioned drawbacks in the background art, the present invention aims to provide a double-stator motor based on excitation source synchronous and asynchronous double modulation, which not only solves the problems of low space utilization rate, low power density when operating as power generation, difficulty in wide-range magnetic modulation and low reliability of the traditional rotor permanent-magnet hybrid excitation motor, but also further introduces synchronous modulation on the basis of asynchronous modulation with respect to the general double-stator motor, further improves the power density of the motor, and improves the motor efficiency.
The purpose of the invention can be realized by the following technical scheme: a double-stator motor based on excitation source synchronous asynchronous double modulation comprises an outer stator, a middle rotor and an inner stator which are coaxially arranged from outside to inside, wherein the outer stator and the inner stator are fixedly connected with a motor shell, and the middle rotor is connected with a motor rotating shaft through a rotor bracket; the intermediate rotor comprises magnetic conduction blocks and permanent magnetic blocks which are sequentially staggered along the circumference, and the permanent magnetic blocks are all magnetized outwards in the radial direction.
Furthermore, the side surfaces of the magnetic conduction block and the permanent magnet block are tightly attached, and the thicknesses of the magnetic conduction block and the permanent magnet block are the same; the width of the magnetic conduction block is consistent with that of the outer stator tooth shoe.
Furthermore, the magnetic conduction block selects silicon steel sheet materials, and the permanent magnet selects neodymium iron boron materials.
Furthermore, the magnetic conduction block and the intermediate rotor permanent magnet block do not move relatively, synchronous modulation is introduced, the magnetic conduction block and the inner stator direct current excitation winding move relatively, and asynchronous modulation is introduced.
Furthermore, an air gap is formed between the outer stator and the middle rotor, and an air gap is also formed between the inner stator and the middle rotor; the outer stator comprises an outer stator iron core and an armature winding embedded in an outer stator slot; the inner stator comprises an inner stator iron core, a permanent magnet embedded between the stator notches and a direct current excitation winding wound on the inner stator teeth.
Furthermore, the outer stator core comprises an outer stator yoke and outer stator teeth which are uniformly arranged along the circumferential direction, each outer stator tooth comprises a tooth neck and a tooth shoe, and an outer stator slot is formed between every two adjacent outer stator teeth; the armature winding is placed in the outer stator slot at intervals of one outer stator tooth and wound on the outer stator tooth.
Furthermore, the inner stator core comprises an inner stator yoke and inner stator teeth which are uniformly distributed along the circumferential direction, each inner stator tooth comprises an inner stator tooth neck and an inner stator tooth shoe, a tangential excitation notch permanent magnet is embedded between the inner stator tooth shoes, the notch permanent magnets are tightly attached to the side surfaces of the inner stator tooth shoes and have the same thickness, the magnetizing directions of two adjacent notch permanent magnets are opposite, and neodymium iron boron materials are selected; and concentrated direct-current excitation windings are wound on the tooth necks of the inner stator, and the winding directions of the adjacent excitation windings are opposite.
Furthermore, the number of the magnetic conduction blocks and the number of the permanent magnets are respectively 10, and the number of the outer stator teeth and the number of the inner stator teeth are respectively 12.
Furthermore, the armature winding comprises 6 sets of windings A1, A2, B1, B2, C1 and C2, wherein the windings A1 and A2 are sequentially connected in series to form a phase A winding, the windings B1 and B2 are sequentially connected in series to form a phase B winding, and the windings C1 and C2 are sequentially connected in series to form a phase C winding.
Furthermore, direct current with adjustable size and direction is introduced into the direct current excitation winding of the inner stator, positive direct current is continuously introduced to increase the magnetism of the motor, and negative direct current is continuously introduced to weaken the magnetism of the motor or extinguish the magnetism when faults occur.
Further, in general terms, let the number of outer stator teeth be N s The number of pole pairs of the armature winding is P a The number of the intermediate rotor magnetic conduction blocks and the intermediate rotor permanent magnets is N r The angular velocity of the intermediate rotor rotating machine is omega r The number of pole pairs of the excitation winding of the inner stator is P w (ii) a The magnetic conduction blocks and the direct-current excitation winding of the inner stator move relatively to introduce asynchronous modulation, wherein the magnetic conduction blocks are alternately distributed along the circumferential direction to cause the space air gap magnetic conductance to periodically change along the circumferential direction, the direct-current excitation magnetomotive force acts with the alternating magnetic conductance to generate a series of space harmonic magnetic fields in the space, and the number of pole pairs P of the space harmonic magnetic fields ij And the pole pair number P of the DC excitation winding w And the number N of the magnetic conduction blocks of the intermediate rotor r Satisfy the relation of P ij ＝|iP w ±jN r I is a positive odd number, j is 0 or a positive integer, and the rotation speed corresponding to the harmonic is
Figure BDA0003747599670000031
Pole pair number P of DC exciting winding w In the generated magnetic potential, P w The amplitude of the antipodal magnetic potential is highest, i =1, and P is modulated w ±jN r Magnetic field of opposite poles
Figure BDA0003747599670000032
Is rotated at a speed of (1), generates a rotating back electromotive force and performs work, j cannot be 0, namely P w The antipole magnetic field does not do work, and P generated in the air gap and consistent with the pole pair number of the outer stator armature a The opposite harmonic will be in contact with the armature P a The counter-pole fundamental wave interaction is adopted, so that the induced electromotive force of the motor is improved, the power density of the motor is improved, and asynchronous modulation is adopted.
The magnetic conductive blocks and the intermediate rotor permanent magnetic blocks do not move relatively, synchronous modulation is introduced, and under the modulation action, a series of harmonic magnetic fields with the pole pair number P are generated in the air gap magnetic field mn Number of pole pairs N with permanent magnet of middle rotor r And number of outer stator teeth N s Satisfy the relationship of P mn ＝|mN r ±nN s I, m is a positive odd number, n is 0 or a positive integer, and the rotation speed corresponding to the harmonic is
Figure BDA0003747599670000033
Among the magnetic potentials generated by the permanent magnets of the intermediate rotor, N r When the amplitude of the antipodal magnetic potential is the highest, and m =1, N after modulation r ±nN s Magnetic field of opposite poles
Figure BDA0003747599670000034
When N is 0, the modulated N r The antipode magnetic field does work and is synchronously modulated. The number of the middle rotor magnetic conduction blocks and the number of the permanent magnets of the motor are respectively 10, 10 antipodal fundamental wave magnetic fields generated by the permanent magnets synchronously rotating with the magnetic conduction blocks do work and interact with 10 antipodal harmonic waves in an armature winding wound on the outer stator teeth, so that the induced electromotive force of the motor is improved, and the power output capacity of the motor is further improved.
By adopting the technical scheme of the invention, the beneficial effects can be realized as follows:
(1) The rotor consists of the magnetic conduction blocks and the permanent magnet blocks which are tightly attached along the circumferential direction, wherein the permanent magnet blocks are magnetized outwards, and the permanent magnet magnetic potential and the electric excitation magnetic potential can play a mutual superposition effect, so that the output power of the motor during the power generation operation can be improved; in addition, aiming at the existing double-stator motor modulation ring which is the combination of a magnetic conduction block and a non-magnetic conduction block, the invention adopts the intermediate rotor modulation ring which consists of a permanent magnet block and a magnetic conduction block, and the permanent magnet block and the magnetic conduction block do not have relative motion, and the synchronous modulation is introduced by utilizing the permanent magnet block which is one of excitation sources on the basis of the main utilization of asynchronous modulation of the existing double-stator motor, thereby further increasing the power density of the motor.
(2) The concentrated direct-current excitation winding is placed in the inner stator slot, and the flexible control of the motor on the air gap magnetic field can be realized by adjusting the size and the direction of the excitation current, so that the wide-range magnetic adjustment can be realized when the motor generates electricity, the wide-range power change is obtained, and the adjustment of the output voltage when the motor generates electricity is convenient; the concentrated direct current excitation winding is used as another excitation source and moves relative to the magnetic conduction block, so that asynchronous modulation is introduced, the output torque capacity of the motor is enhanced, and the output power of the motor during power generation operation is improved.
(3) The permanent magnet and the armature winding are separately arranged, heat generated by the armature winding arranged in the outer stator slot during power generation can be dissipated through the shell, the armature winding is easy to cool, and meanwhile, the loss of an outer stator core is reduced, and the running efficiency of the motor is improved; the heat generated by the permanent magnets can be transferred outwards through the connecting rotating shaft, and the risk of irreversible demagnetization of the permanent magnets of the motor can be avoided.
(4) The invention improves the power density of the motor, improves the motor efficiency, does not increase the axial length of the motor and the volume of the motor, and allows synchronous modulation and asynchronous modulation to coexist in the same two-dimensional plane.
Drawings
Fig. 1 is a schematic structural diagram of a double-stator motor based on excitation source synchronous and asynchronous double modulation provided by the invention;
FIG. 2 is a schematic view of the structure of the middle rotor of the motor of the present invention;
FIG. 3 is a schematic three-dimensional structure of the motor of the present invention;
fig. 4 is a schematic structural view of a conventional 12-slot 10-pole segmented stator electro-magnetic motor;
FIG. 5 is a schematic view of an uncontrolled rectifier circuit connected to the motor of the present invention when operating as a generator;
FIG. 6 is a graph comparing the output voltage at the load end of the permanent magnet of the interrotor when the motor of the present invention is operating as a generator;
FIG. 7 is a magnetic field distribution diagram of the present invention when the permanent magnets of the intermediate rotor are fully magnetized inward according to finite element simulation of the motor;
FIG. 8 is a magnetic field distribution diagram of the present invention when the permanent magnets of the interrotor simulated by finite element are all magnetized outwardly;
FIG. 9 is a comparison graph of the rectified output no-load voltage of the motor when the motor of the present invention is used as the excitation current of the generator;
in the figure: 1. an outer stator; 2. an inner stator; 3. an intermediate rotor; 4. an armature winding; 5. a direct current excitation winding; 6. a notch permanent magnet; 7. a magnetic conduction block; 8. a permanent magnet block; 9. the outer stator of the traditional partitioned stator motor; 10. traditional zoned stator motor armature windings; 11. a rotor magnetic adjusting block of a traditional partitioned stator motor; 12. an inner stator of a traditional partitioned stator motor; 13. a traditional partitioned stator motor is provided with a field winding.
Detailed Description
In order to make the objects, technical solutions and features of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the double-stator motor based on excitation source synchronous asynchronous double modulation provided by the invention comprises an outer stator 1, a middle rotor 3 and an inner stator 2 which are coaxially arranged; an air gap is formed between the outer stator 1 and the middle rotor 3, and an air gap is also formed between the inner stator 2 and the middle rotor 3; the outer stator 1 comprises an outer stator core and armature windings 4 embedded in the outer stator slots.
As shown in fig. 2, the interrotor 3 includes 10 magnetic conductive blocks 7 and 10 permanent magnets 8 arranged in a staggered manner along the circumference; as shown in fig. 3, the inner stator 2 includes an inner stator core, a permanent magnet 6 embedded between stator slots, and a dc excitation winding 5 wound around the inner stator teeth; the outer stator 1 and the inner stator 2 are fixedly connected with a motor shell, and the middle rotor 3 is connected with a motor rotating shaft through a rotor support.
As shown in fig. 1 and 3, the outer stator core includes an outer stator yoke and 12 outer stator teeth uniformly arranged in a circumferential direction, each outer stator tooth includes a tooth neck and a tooth shoe, an outer stator slot is formed between two adjacent outer stator teeth, and the armature winding 4 is disposed in the outer stator slot at every other outer stator tooth and wound on the outer stator tooth. The armature winding 4 comprises 6 sets of windings including A1, A2, B1, B2, C1 and C2, wherein the A1 and A2 windings are sequentially connected in series to form an A-phase winding, the B1 and B2 windings are sequentially connected in series to form a B-phase winding, and the C1 and C2 windings are sequentially connected in series to form a C-phase winding.
For the general expression, as shown in fig. 1 and 3, the number of teeth of the outer stator is N s The number of pole pairs of the armature winding is P a The number of the intermediate rotor magnetic conduction blocks and the intermediate rotor permanent magnets is N r Angular velocity of the interrotor rotating machine is ω r The number of pole pairs of the excitation winding of the inner stator is P w 。
As shown in fig. 4, a generalized conventional partitioned stator electrically-excited motor structure is provided, which mainly includes an outer stator 9, an armature winding 10 wound on the outer stator, a middle rotor magnetic adjusting block 11, an inner stator 12, and an excitation winding 13 wound on the inner stator. The motor mainly utilizes the fact that a magnetic field generated by an inner stator excitation winding is modulated by a middle rotor magnetic adjusting block to generate a harmonic magnetic field consistent with the pole pair number of an outer stator armature winding, so that the harmonic magnetic field interacts with the middle rotor magnetic adjusting block and an air gap, only the magnetic adjusting block is rotationally modulated, and the modulation property is asynchronous modulation.
As shown in fig. 2, the side surfaces of the magnetic conductive block 7 and the permanent magnet block 8 are tightly attached, the thickness of the magnetic conductive block 7 is the same as that of the outer stator tooth shoe, the width of the magnetic conductive block 7 is consistent with that of the outer stator tooth shoe, the magnetic conductive block 7 is made of a silicon steel sheet material, and the permanent magnet blocks 8 are all magnetized in the outward radial direction and made of neodymium iron boron materials. Compared with the traditional partitioned stator electric excitation motor, the added permanent magnet 8 and the magnetic conductive block 7 rotate synchronously, the permanent magnet 8 serving as one of excitation sources introduces synchronous modulation, and under the modulation action, a series of harmonic magnetic fields are generated in an air gap magnetic field, and the pole pair number P of the harmonic magnetic fields is mn Number of pole pairs N with permanent magnet of middle rotor r And number of outer stator teeth N s Satisfies the relationship of P mn ＝|mN r ±nN s I, m is a positive odd number, n is 0 or a positive integer, and the rotation speed corresponding to the harmonic is
Figure BDA0003747599670000061
Among the magnetic potentials generated by the permanent magnets of the intermediate rotor, N r The amplitude of the antipodal magnetic potential is the highest,n after modulation when m =1 r ±nN s Magnetic field of opposite poles
Figure BDA0003747599670000062
When N is 0, the modulated N r The antipole magnetic field does work to produce synchronous modulation effect. The number of the magnetic blocks 7 and the number of the permanent magnets 8 of the intermediate rotor of the motor are respectively 10, 10 pairs of pole fundamental wave magnetic fields generated by the permanent magnets 8 which synchronously rotate with the magnetic blocks 7 do work and interact with 10 pairs of pole harmonic waves in the armature winding 4 wound on the outer stator teeth, so that the induced electromotive force of the motor is improved, and the power output capacity of the motor is improved.
In order to illustrate the effect of the added permanent magnet of the intermediate rotor, as shown in fig. 5, an uncontrolled rectifying circuit can be connected to the motor during power generation operation, and the magnitude of the output voltage at the load end when the permanent magnet is added under the same load is compared with the magnitude of the output voltage at the load end when the permanent magnet is not added, as shown in fig. 6, the magnitude of the output voltage can be increased under the same load after the permanent magnet of the intermediate rotor is added, so that the output power of the motor can be increased.
In addition, to illustrate that the outward magnetization of the whole permanent magnet 8 helps to make the permanent magnet magnetic potential and the electric excitation magnetic potential have a mutual superposition effect, please refer to fig. 7 and 8, and with the help of finite element simulation software, it can be found that the outward magnetization of the whole permanent magnet 8 is denser than the magnetic force line of the linked armature winding in which the whole permanent magnet 8 is inward magnetized, so that the selected permanent magnet that is outward magnetized can utilize the superposition effect of the magnetic potential to improve the power density of the motor, and improve the output power of the motor during the power generation operation.
As shown in fig. 1 and 3, the inner stator core includes an inner stator yoke and 12 inner stator teeth uniformly distributed along a circumferential direction, the inner stator teeth include an inner stator tooth neck and an inner stator tooth shoe, the inner stator tooth neck is wound with a concentrated dc excitation winding 5, and winding directions of adjacent excitation windings are opposite. The concentrated dc excitation winding 5 acts as another excitation source with relative motion to the magnetic block 7, thereby introducing asynchronous modulation. Wherein the magnetic conduction blocks 7 are alternately distributed along the circumferential direction to cause the space air gap magnetic conduction to periodically change along the circumferential direction, and the direct current excitation magnetomotive force is alternated with the alternating current excitation magnetomotive forceThe variable magnetic conductance effect can generate a series of space harmonic magnetic fields in space, and the pole pair number P of the magnetic fields ij And the pole pair number P of the DC excitation winding w And the number N of the magnetic conduction blocks of the intermediate rotor r Satisfy the relation of P ij ＝|iP w ±jN r I is a positive odd number, j is 0 or a positive integer, and the rotation speed corresponding to the harmonic is
Figure BDA0003747599670000071
Pole pair number P of DC exciting winding w In the generated magnetic potential, P w The amplitude of antipodal magnetic potential is highest, i =1, and P is modulated w ±jN r Magnetic field of opposite poles
Figure BDA0003747599670000072
Is rotated at a speed of (1), generates a rotating back electromotive force and performs work, j cannot be 0, namely P w The antipole magnetic field does not do work, and P generated in the air gap and consistent with the pole pair number of the outer stator armature a The opposite harmonic will be in contact with the armature P a The counter-pole fundamental wave interaction, thereby improving the induced electromotive force of the motor, improving the power density of the motor and generating the asynchronous modulation effect. As shown in fig. 9, when the exciting current changes from-40A to 0A and then to 40A, compared with the magnitude of the no-load voltage output by the external circuit when the motor of the present invention is in power generation operation, it is obvious that the change range of the rectified output voltage is wide when the exciting current changes, and the flexible control of the air gap magnetic field by the motor can be realized by adjusting the magnitude and direction of the exciting current, so that the wide-range magnetic modulation can be realized when the motor is in power generation operation, a wide-range power change can be obtained, and the adjustment of the output voltage when the motor is in power generation operation is convenient.
The above embodiments are only for illustrating the technical idea and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the content of the present invention and implement the present invention, and not to limit the protection scope of the present invention by this means. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. The double-stator motor based on excitation source synchronous and asynchronous double modulation is characterized by comprising an outer stator (1), an inner stator (2) and an intermediate rotor (3) which are coaxially arranged, wherein the intermediate rotor (3) comprises magnetic conductive blocks (7) and permanent magnetic blocks (8) which are sequentially staggered along the circumference, and the permanent magnetic blocks (8) are all magnetized outwards in the radial direction.
2. The double-stator motor based on excitation source synchronous asynchronous double modulation is characterized in that the side surfaces of the magnetic conduction blocks (7) and the permanent magnet blocks (8) are tightly attached and have the same thickness; the widths of the magnetic conduction blocks (7) and the widths of the outer stator tooth shoes are kept consistent.
3. The double-stator motor based on excitation source synchronous asynchronous double modulation is characterized in that the magnetic conductive blocks (7) are made of silicon steel sheets, and the permanent magnet blocks (8) are made of neodymium iron boron.
4. Double stator machine based on excitation source synchronous asynchronous double modulation according to claim 1, characterized in that there is no relative movement between the magnetic blocks (7) and the interrotor permanent magnets (8), introducing synchronous modulation, there is relative movement between the magnetic blocks (7) and the inner stator dc excitation winding (5), introducing asynchronous modulation.
5. Double stator machine based on excitation source synchronous asynchronous double modulation according to claim 1 characterized by that the outer stator (1) and the interrotor (3) are provided with air gap, the inner stator (2) and the interrotor (3) are also provided with air gap; the outer stator (1) comprises an outer stator iron core and an armature winding (4) embedded in an outer stator slot; the inner stator (2) comprises an inner stator iron core, a permanent magnet (6) embedded between stator notches and a direct current excitation winding (5) wound on inner stator teeth.
6. The double stator motor based on excitation source synchronous asynchronous double modulation as claimed in claim 5, wherein said outer stator core comprises an outer stator yoke and outer stator teeth uniformly arranged along a circumferential direction, each outer stator tooth comprises a tooth neck and a tooth shoe, and an outer stator slot is formed between two adjacent outer stator teeth; the armature windings (4) are placed in the outer stator slots at intervals of one outer stator tooth and wound on the outer stator teeth.
7. The double-stator motor based on excitation source synchronous asynchronous double modulation is characterized in that an inner stator core comprises an inner stator yoke and inner stator teeth uniformly distributed along the circumferential direction, the inner stator teeth comprise inner stator tooth necks and inner stator tooth shoes, tangentially excited notch permanent magnets (6) are embedded between the inner stator tooth shoes, the notch permanent magnets (6) are tightly attached to the side surfaces of the inner stator tooth shoes, the thicknesses of the notch permanent magnets are the same, the magnetizing directions of two adjacent notch permanent magnets (6) are opposite, and neodymium iron boron materials are selected; and concentrated direct-current excitation windings (5) are wound on the tooth necks of the inner stator, and the winding directions of the adjacent excitation windings are opposite.
8. Double stator machine based on excitation source synchronous asynchronous double modulation according to claim 7 characterized by 10 magnetic conducting blocks (7) and permanent magnets (8) respectively, 12 outer stator teeth and inner stator teeth respectively.
9. An excitation source synchronous asynchronous double modulation based double stator motor according to claim 8, characterized in that the armature winding (4) comprises 6 sets of windings A1, A2, B1, B2, C1 and C2, wherein the windings A1 and A2 are sequentially connected in series to form a phase winding a, the windings B1 and B2 are sequentially connected in series to form a phase winding B, and the windings C1 and C2 are sequentially connected in series to form a phase winding C.
10. Double stator machine based on excitation source synchronous asynchronous double modulation according to any of claims 1-9, characterized in that the direct current with adjustable size and direction is applied to the direct current excitation winding (5) of the inner stator, the positive direct current is continuously applied to increase the field of the machine, and the negative direct current is continuously applied to weaken the field of the machine or extinguish the field in case of failure.
CN202210835173.XA 2022-07-15 2022-07-15 Double-stator motor based on excitation source synchronous and asynchronous double modulation Pending CN115347753A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115603537A (en) * 2022-12-14 2023-01-13 东南大学（Cn） Double-stator variable magnetic flux double-permanent-magnet magnetic field modulation motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115603537A (en) * 2022-12-14 2023-01-13 东南大学（Cn） Double-stator variable magnetic flux double-permanent-magnet magnetic field modulation motor
CN115603537B (en) * 2022-12-14 2023-03-03 东南大学 Double-stator variable magnetic flux double-permanent-magnet magnetic field modulation motor

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