CN117097101A - Electric and power generation integrated axial flux permanent magnet motor - Google Patents
Electric and power generation integrated axial flux permanent magnet motor Download PDFInfo
- Publication number
- CN117097101A CN117097101A CN202311082687.3A CN202311082687A CN117097101A CN 117097101 A CN117097101 A CN 117097101A CN 202311082687 A CN202311082687 A CN 202311082687A CN 117097101 A CN117097101 A CN 117097101A
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- Prior art keywords
- power generation
- electric
- stator
- permanent magnet
- winding
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- 238000010248 power generation Methods 0.000 title claims abstract description 110
- 230000004907 flux Effects 0.000 title claims abstract description 32
- 238000004804 winding Methods 0.000 claims description 69
- 230000027311 M phase Effects 0.000 claims description 5
- 239000000696 magnetic material Substances 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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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
- H02K1/16—Stator cores with slots for windings
-
- 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
- H02K1/2793—Rotors axially facing stators
- H02K1/2795—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2796—Rotors axially facing stators the rotor consisting of two or more circumferentially positioned magnets where both axial sides of the rotor face a stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
Abstract
The invention relates to an electric and power generation integrated axial flux permanent magnet motor, which comprises an electric stator, a power generation stator, a permanent magnet rotor, a rotating shaft and a casing, wherein the casing comprises a first casing and a second casing, the electric stator is fixed in the first casing, the power generation stator is fixed in the second casing, the permanent magnet rotor is arranged between the electric stator and the power generation stator, an electric air gap exists between the permanent magnet rotor and the electric stator, a power generation air gap exists between the permanent magnet rotor and the power generation stator, the permanent magnet rotor is fixedly connected with the rotating shaft, bearings are arranged on two sides of the rotating shaft, and the stator is in running fit with the bearings. The invention solves the problems of non-ideal frequency stability and inertia capacity of the existing new energy grid connection, more harmonic content of an inverter and more complex mechanical structure of a synchronous motor to a system, and the motor integrates the functions of electric and power generation, thereby not only having the advantages of high inertia capacity and stable frequency of the synchronous motor, but also having the advantages of small volume and high efficiency.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to an electric and power generation integrated axial flux permanent magnet motor for new energy grid connection.
Background
With the increase of new energy grid-connected capacity, the addition of a large number of nonlinear power electronic devices causes a plurality of low-frequency and high-frequency harmonics to exist in the system, the total harmonic distortion rate is usually more than 5%, and the direct influence on a power grid and electric equipment is generated; secondly, as the volatility and randomness of the new energy system are larger, the system does not have the characteristic of continuous and stable power generation of the traditional thermal power generation field, and brings great difficulty to the dispatching of the power grid in the power utilization peak period; in addition, the power electronic device isolates the power grid from the new energy system, so that the two frequencies are decoupled from the rotation speed, the real inertia of the thermal generator set is not provided, and the frequency stability of the power grid during fault can not be maintained.
In order to improve the inertia and frequency stability of a new energy power grid, a synchronous motor pair is provided (application number CN 202011296820.1), and mainly consists of a synchronous motor and a synchronous generator, wherein the synchronous motor pair is connected between a new energy inverter and the power grid, so that a new energy system has the operation performance of a traditional thermal power unit, the system stability, the inertia capacity and the scheduling capacity are improved, but the addition of the synchronous motor pair in the new energy system increases the system cost, and is unfavorable for large-scale manufacture and application; patent (application number CN 202110352951.5) proposes a method and a system for controlling the operation of an inverter of a virtual synchronous motor, wherein a mathematical model of the virtual synchronous motor is applied to the inverter of a new energy system, and the inverter is controlled by adopting a control strategy of the synchronous motor, so that the inverter has the operation characteristics of a rotating motor, the inertia and the frequency stability of a new energy power generation system are effectively improved, but the dynamic performance of the mode is poor, and the adjustment period is long.
Disclosure of Invention
The invention aims to: the invention provides an electric and power generation integrated axial flux motor, which aims to solve the problems that the frequency stability and the inertia capacity of the existing new energy grid connection are not ideal, the harmonic content of an inverter is more, and the mechanical structure of a synchronous motor to a system is more complex.
The invention is realized by the following technical scheme:
the invention provides an electric and power generation integrated axial flux permanent magnet motor, which comprises an electric stator, a power generation stator, a permanent magnet rotor, a rotating shaft and a casing, wherein the casing comprises a first casing and a second casing, the electric stator is fixed in the first casing, the power generation stator is fixed in the second casing, the permanent magnet rotor is arranged between the electric stator and the power generation stator, an electric air gap exists between the permanent magnet rotor and the electric stator, a power generation air gap exists between the permanent magnet rotor and the power generation stator, the permanent magnet rotor is fixedly connected with the rotating shaft, bearings are arranged on two sides of the rotating shaft, and the stator is in running fit with the bearings.
Further, the magnetic field generated after the electromotive stator is excited by the current can control the amplitude and the frequency of the induced electromotive force generated by the power generation stator.
Further, the electric stator comprises an electric stator iron core and an electric winding, an electric stator slot is formed in the electric stator iron core, and the electric winding is arranged in the electric stator slot; the power generation stator comprises a power generation stator iron core and a power generation winding, a power generation stator groove is formed in the power generation stator iron core, and the power generation winding is arranged in the power generation stator groove; the electric winding is a symmetrical winding with m being more than or equal to 3; the power generation winding is a 3-phase symmetrical winding, and the winding spaces are sequentially different by 120 degrees in electrical angle.
Further, the number of slots of the electric stator and the number of slots of the generating stator are selected according with the principle of matching the number of poles and the number of slots of the corresponding phase motor.
Further, the number of poles of the armature reaction magnetic field generated by the electric winding is the same as that of the armature reaction magnetic field generated by the power generation winding, and the number of poles of the armature reaction magnetic field is the same as that of the rotor.
Furthermore, the power supply type of the input end of the electric winding can be a voltage source or a current source, and the output end of the power generation winding can be connected with an infinite power grid or an independent load.
Further, the electric winding is electrically and mechanically uncoupled from the power generating winding.
Further, the rotor comprises a rotor support and permanent magnets, a plurality of grooves are formed in the rotor support along the circumferential direction in an array mode, a plurality of fixing holes are formed between every two adjacent grooves, the permanent magnets are placed in the grooves of the rotor support, and the permanent magnets are alternately arranged along the circumferential direction N, S.
Further, the rotor support comprises a first rotor support and a second rotor support, the first rotor support and the second rotor support are relatively and fixedly attached to each other, and the rotor support is made of non-magnetic materials.
The invention has the following specific advantages:
1) According to the electric and power generation integrated axial flux permanent magnet motor, through creatively arranging the electric stator and the power generation stator, one motor has the double functions of electric and power generation, and the mechanical structure of the synchronous motor to the system is simplified.
2) According to the electric and power generation integrated axial flux permanent magnet motor, as the rotor diameter of the axial flux motor is large, compared with a virtual synchronous motor, the rotational inertia of the motor is larger, and the disturbance rejection capability of a system and the frequency stability of a power grid are improved.
3) According to the electric and power generation integrated axial flux permanent magnet motor, the output frequency and the phase of the power generation stator can be adjusted by controlling the electric stator, and compared with a synchronous motor pair, a control system of the power generation stator can be omitted, so that the complexity of the system is reduced.
4) Compared with a synchronous motor pair, the electric and power generation integrated axial flux permanent magnet motor has the advantages that the excitation magnetic field is generated by the permanent magnets, and the efficiency of the motor is higher.
5) The electric stator and the power generation stator are not electrically connected, and the system is high in reliability.
Drawings
FIG. 1 is a cross-sectional view of an electric and power generation integrated axial flux permanent magnet motor of the present invention;
FIG. 2 is an exploded view of an electric and power generation integrated axial flux permanent magnet motor of the present invention;
FIG. 3 is a partial magnetic path trend diagram of a two-dimensional model of an electric and power generation integrated axial flux permanent magnet motor of the invention;
FIG. 4 is a block diagram of an electric and power generation integrated axial flux permanent magnet motor rotor of the present invention;
reference numerals illustrate:
1. electric stator, 2, generating stator, 3, permanent magnet rotor, 4, rotating shaft, 5A, first, 5B, second, 6, bearing, 11, electric stator core, 12, electric winding, 13, electric stator slot, 111, electric stator core yoke, 112, electric stator core tooth, 21, generating stator core, 22, generating winding, 23, generating stator slot, 211, generating stator core yoke, 212, generating stator core tooth, 301, first rotor bracket, 302, second rotor bracket, 303, permanent magnet, 3012, fixed hole, 3021, groove, 5A, first, 5B, second, 7A, electric air gap, 7B.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in fig. 1 and 2, an electric and power generation integrated axial flux permanent magnet motor comprises an electric stator 1, a power generation stator 2, a permanent magnet rotor 3, a rotating shaft 4, a casing 5, a bearing 6 and the like, wherein the casing 5 comprises a first casing 5A and a second casing 5B, the electric stator 1 is fixed on the first casing 5A, the power generation stator 2 is fixed on the second casing 5B, the permanent magnet rotor 3 is arranged between the electric stator 1 and the power generation stator 2, an electric air gap 7A exists between the permanent magnet rotor 3 and the electric stator 1, a power generation air gap 7B exists between the permanent magnet rotor 3 and the power generation stator 2, the permanent magnet rotor 3 is fixedly connected with the rotating shaft 4, the bearings 6 are installed on two sides of the rotating shaft 4, the stator 1 is connected with the stator 1 through the bearings 6, and the stator 1 is in running fit with the bearings 6.
The magnetic field generated after the electromotive stator 1 is excited by the current can control the amplitude and the frequency of the induced electromotive force generated by the power generation stator 2. After the electromotive stator 1 is excited by current, the permanent magnet rotor 3 is driven to rotate, the permanent magnet field on the rotating permanent magnet rotor 3 cuts the power generation stator 2 to generate induced electromotive force, and the power generation stator 2 outputs alternating current outwards.
As shown in fig. 2 and 3, the electric stator 1 includes an electric stator core 11 and an electric winding 12, the electric stator core 11 includes an electric stator core yoke 111 and electric stator core teeth 112, a plurality of electric stator core teeth 112 are circumferentially disposed on the electric stator core yoke 111, gaps between adjacent electric stator core teeth 112 are electric stator slots 13, and the electric winding 12 is disposed in the electric stator slots 13; the power generation stator 2 comprises a power generation stator core 21 and a power generation winding 22, wherein the power generation stator core 21 comprises a power generation stator core yoke 211 and power generation stator core teeth 212, a plurality of power generation stator core teeth 212 are arranged on the power generation stator core yoke 211 along the circumferential direction, gaps among the power generation stator core teeth 212 are power generation stator slots 23, and the power generation winding 22 is arranged in the power generation stator slots 23; the electric winding 12 is a m-phase symmetrical winding (m is more than or equal to 3), the symmetrical winding means that m-phase winding spaces are sequentially different by 360 degrees/m electric angle or 180 degrees/m electric angle, the electric winding 12 is arranged to be multi-phase, which is beneficial to the driving of a large-sized motor, the current of each phase winding of the motor can be reduced, and meanwhile, the harmonic wave of the air gap field of the motor and the torque fluctuation of the motor can be reduced; the power generation winding 22 is a 3-phase symmetrical winding, the winding spaces are sequentially different by 120 degrees in electrical angle, and the power generation winding 22 is 3-phase and can be matched with a three-phase power grid.
The relative positions of the electric stator 1 and the power generation stator 2 in the circumferential direction are arbitrary at the time of assembly. In this embodiment, the electric stator 1 and the power generation stator 2 shown in fig. 2 and 3 are three phases, and the two stators are identical, and the electric stator 1 and the power generation stator 2 can be installed in mirror symmetry, or the other stator can be installed after rotating by one angle.
The number and the shape of the slots of the electric stator slots 13 and the generating stator slots 23 can be the same or different, the number of the slots is selected to meet the matching principle of the number of poles and the number of slots of the corresponding phase motor, for example, the number of the electric stator slots 13 of the m-phase electric stator 1 meets the matching rule of the number of poles and the number of slots of the m-phase motor, the number of the generating stator slots 23 of the 3-phase generating stator 2 meets the matching rule of the number of poles and the number of slots of the 3-phase motor, and the number of the slots of the electric stator slots 13 and the generating stator slots 23 in fig. 2 is 36 slots; the insertion of the motor windings 12 and the generator windings 22 should be such that: the number of poles of the armature reaction magnetic field generated by the electric winding 12 and the power generation winding 22 is the same as that of the rotor, and the three poles are the same, so that the armature reaction magnetic field of the electric winding 12 can be ensured to drive the rotor to rotate, and the power generation winding 22 can be ensured to generate alternating current with fixed frequency.
The winding structure and the number of turns in series of each phase of the electric winding 12 and the power generation winding 22 can be the same or different, and the electric winding 12 and the power generation winding 22 are not coupled in electrical and mechanical aspects, so that the reliability of the motor is higher.
The power supply type of the input end of the electric winding 12 can be a voltage source or a current source, and the output end of the power generation winding 22 can be connected with an infinite power grid or an independent load; by adjusting the frequency of the supply current in the motor winding 12, the frequency of the induced voltage and current in the generator winding 22 can be varied; by adjusting the initial phase of the supply current in the electromotive winding 12, the spatial phase and amplitude of the air gap resultant magnetic field can be changed, thereby adjusting the magnitude of the induced electromotive force of the generating winding 22 and the output power of the generating stator 2, as shown in phi in fig. 3 M And phi is equal to P In the opposite direction, the induced electromotive force of the power generation winding 22 can be reduced M And phi is equal to P The induced electromotive force of the power generation winding 22 can be raised in the same direction.
As shown in fig. 4, the rotor 3 includes a rotor support and a permanent magnet 303, the rotor support includes a first rotor support 301 and a second rotor support 302, the first rotor support 301 and the second rotor support 302 are relatively attached and fixedly arranged by bolts, and the rotor support is made of a non-magnetic material, such as austenitic stainless steel or titanium alloy. The rotor support is provided with a plurality of grooves 3021 along the circumferential array, a plurality of fixing holes 3012 are arranged between adjacent grooves 3021, the permanent magnets 303 are placed in the grooves 3021 of the rotor support, and the permanent magnets 303 are alternately arranged along the circumferential direction N, S.
As shown in fig. 3, the electromotive winding 12 generates a magnetic flux Φ M Magnetic flux phi generated by the permanent magnet 303 P ，φ M +φ P Collectively across the power generation winding 22; magnetic flux phi M And phi is equal to P Through the electric stator core yoke 111, the electric stator core teeth 112, the electric air gap 7A, the permanent magnet 303, the generating air gap 7B,The power generation stator core teeth 212, the power generation stator core yoke 211, the other power generation stator core teeth 212, the power generation air gap 7B, the permanent magnet 303, the electric air gap 7A and the electric stator core teeth 112 return to the electric stator core yoke 111 to form a closed path, and the magnetic flux phi is changed M The magnitude and direction of the resultant magnetic flux phi that is linked through the generator winding 22 can be adjusted M +φ P Thereby changing the effective value (or amplitude) of the induced electromotive force output by the power generation winding.
The electric and power generation integrated axial flux permanent magnet motor can simplify the mechanical structure of the synchronous motor to the system, improve the operation efficiency of the motor, and in addition, the electric and power generation integrated axial flux permanent magnet motor has larger moment of inertia, and can improve the disturbance rejection capability of the system and the frequency stability of a power grid.
Claims (9)
1. An electric and power generation integrated axial flux permanent magnet motor is characterized in that: the motor comprises an electric stator (1), a power generation stator (2), a permanent magnet rotor (3), a rotating shaft (4) and a shell (5), wherein the shell (5) comprises a first shell (5A) and a second shell (5B), the electric stator (1) is fixed in the first shell (5A), the power generation stator (2) is fixed in the second shell (5B), the permanent magnet rotor (3) is arranged between the electric stator (1) and the power generation stator (2), an electric air gap (7A) exists between the permanent magnet rotor (3) and the electric stator (1), a power generation air gap (7B) exists between the permanent magnet rotor (3) and the power generation stator (2), the permanent magnet rotor (3) is fixedly connected with the rotating shaft (4), bearings (6) are arranged on two sides of the rotating shaft (4), and the stator (1) is in running fit with the bearings (6).
2. An electric and power generation integrated axial flux permanent magnet machine according to claim 1, wherein: the magnetic field generated after the electromotive stator (1) is excited by the current can control the amplitude and the frequency of the induced electromotive force generated by the power generation stator (2).
3. An electric and power generation integrated axial flux permanent magnet machine according to claim 1, wherein: the electric stator (1) comprises an electric stator core (11) and an electric winding (12), wherein an electric stator groove (13) is formed in the electric stator core (11), and the electric winding (12) is arranged in the electric stator groove (13); the power generation stator (2) comprises a power generation stator core (21) and a power generation winding (22), a power generation stator groove (23) is formed in the power generation stator core (21), and the power generation winding (22) is arranged in the power generation stator groove (23); the electric winding (12) is a m-phase symmetrical winding, and m is more than or equal to 3; the power generation winding (22) is a 3-phase symmetrical winding, and the winding spaces are sequentially different by 120 degrees in electrical angle.
4. An electric and power generation integrated axial flux permanent magnet machine according to claim 3, wherein: the number of the slots of the electric stator slots (13) and the number of the slots of the generating stator slots (23) are selected according with the matching principle of the number of poles and the number of slots of the corresponding phase motor.
5. An electric and power generation integrated axial flux permanent magnet machine according to claim 3, wherein: the number of poles of the armature reaction magnetic field generated by the electric winding (12) is the same as that of the armature reaction magnetic field generated by the power generation winding (22), and the number of poles of the armature reaction magnetic field is the same as that of the rotor (3).
6. An electric and power generation integrated axial flux permanent magnet machine according to claim 3, wherein: the power supply type of the input end of the electric winding (12) can be a voltage source or a current source, and the output end of the power generation winding (22) can be connected with an infinite power grid or an independent load.
7. An electric and power generation integrated axial flux permanent magnet machine according to claim 3, wherein: the motor winding (12) is electrically and mechanically uncoupled from the generator winding (22).
8. An electric and power generation integrated axial flux permanent magnet machine according to claim 1, wherein: the rotor (3) comprises a rotor support and permanent magnets (303), a plurality of grooves (3021) are formed in the rotor support along the circumferential array, a plurality of fixing holes (3012) are formed between every two adjacent grooves (3021), the permanent magnets (303) are placed in the grooves (3021) of the rotor support, and the permanent magnets (303) are alternately arranged along the circumferential direction N, S.
9. An electric and power generation integrated axial flux permanent magnet machine according to claim 8, wherein: the rotor support comprises a first rotor support (301) and a second rotor support (302), the first rotor support (301) and the second rotor support (302) are relatively and fixedly attached to each other, and the rotor support is made of non-magnetic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311082687.3A CN117097101A (en) | 2023-08-25 | 2023-08-25 | Electric and power generation integrated axial flux permanent magnet motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311082687.3A CN117097101A (en) | 2023-08-25 | 2023-08-25 | Electric and power generation integrated axial flux permanent magnet motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117097101A true CN117097101A (en) | 2023-11-21 |
Family
ID=88778775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311082687.3A Pending CN117097101A (en) | 2023-08-25 | 2023-08-25 | Electric and power generation integrated axial flux permanent magnet motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117097101A (en) |
-
2023
- 2023-08-25 CN CN202311082687.3A patent/CN117097101A/en active Pending
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