CN116914957A - Magnetic-adjustable bearingless magnetic flux reversing permanent magnet motor and control method - Google Patents
Magnetic-adjustable bearingless magnetic flux reversing permanent magnet motor and control method Download PDFInfo
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- CN116914957A CN116914957A CN202310942515.2A CN202310942515A CN116914957A CN 116914957 A CN116914957 A CN 116914957A CN 202310942515 A CN202310942515 A CN 202310942515A CN 116914957 A CN116914957 A CN 116914957A
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- 230000004907 flux Effects 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000004804 winding Methods 0.000 claims abstract description 91
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 75
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910000828 alnico Inorganic materials 0.000 claims abstract description 54
- 239000000725 suspension Substances 0.000 claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000005389 magnetism Effects 0.000 claims abstract description 14
- 230000005415 magnetization Effects 0.000 claims description 27
- 230000001276 controlling effect Effects 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000005347 demagnetization Effects 0.000 claims description 8
- 230000033228 biological regulation Effects 0.000 claims description 6
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 238000010030 laminating Methods 0.000 claims description 3
- 238000005339 levitation Methods 0.000 description 17
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- -1 aluminum-nickel-cobalt Chemical compound 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
Classifications
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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
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- 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
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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
-
- 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
-
- 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
- H02K3/20—Windings for salient poles for auxiliary purposes, e.g. damping or commutating
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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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
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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
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention discloses a bearingless magnetic flux reversing permanent magnet motor with adjustable magnetism and a control method, wherein the motor comprises a stator iron core, a rotor iron core, a suspension winding, a torque winding and a permanent magnet, wherein stator teeth facing the rotor iron core are arranged on the stator iron core, and a winding is wound on the stator teeth; the left side and the right side of the tooth top end of each stator tooth are respectively surface-pasted with a neodymium-iron-boron permanent magnet, the magnetizing directions of the neodymium-iron-boron permanent magnets on the same stator tooth are the same, and the magnetizing directions of the neodymium-iron-boron permanent magnets on adjacent stator tooth are opposite; an alnico permanent magnet is arranged at the tail end of the yoke part of each stator tooth, neodymium-iron-boron permanent magnets are arranged at the two sides of each alnico permanent magnet, the magnetizing direction of the alnico permanent magnets is radial magnetizing, and a closed magnetic circuit can be formed between the neodymium-iron-boron permanent magnets embedded on the adjacent stator teeth and the surface-mounted neodymium-iron-boron permanent magnets. The permanent magnet position in the motor body is skillfully distributed, and the on-line adjustment of the magnetic field is realized by controlling the zero sequence current in the winding.
Description
Technical Field
The invention belongs to the technical field of bearingless motors, and particularly relates to a bearingless flux reversing permanent magnet motor with adjustable magnetism and a control method.
Background
Along with the high-speed development of technology, the high-speed and ultra-high-speed motor has wide application in equipment such as high-speed machine tools, turbo molecular pumps, compressors and the like due to the advantages of high power density, small volume, high reliability, high efficiency and the like. However, the rotor core of the traditional high-speed motor is supported by a mechanical bearing, so that the motor is affected by huge impact when running at high speed or ultra-high speed, the bearing wear is aggravated, the air gap is uneven, the winding heats, the motor efficiency is reduced, and the service lives of the motor and the bearing are shortened.
The magnetic suspension bearing technology solves the abrasion problem of the mechanical bearing to a great extent, and compared with the traditional mechanical bearing, the magnetic suspension bearing has the advantages of long service life, no need of lubrication, high precision and the like. The bearingless permanent magnet synchronous motor is a novel motor which is characterized in that a magnetic suspension bearing is applied to a traditional permanent magnet synchronous motor, the novel motor is a novel motor integrating the functions of rotary driving and magnetic bearing, a coil generating radial suspension force in the magnetic bearing is arranged on a stator core slot of the motor, and is generally called a suspension winding, and an air gap magnetic field generated by a motor primary winding is broken through controlling the magnitude and the direction of current which is fed into the suspension winding, so that the magnitude of the suspension force is controllable, and a rotor core can be stably suspended.
However, most bearingless permanent magnet synchronous motors are rotor core permanent magnets, and permanent magnets are attached to the surface of a rotor core or embedded in the rotor core, so that the integrity of the rotor core is damaged, and the rotor core can be unstable in structure due to high-speed rotation. In addition, the permanent magnet is positioned on the rotor core, so that the cooling condition is poor, the heat dissipation is difficult, the problem of demagnetization of the permanent magnet can be caused by high-speed rotation of the rotor core, the further improvement of the motor performance is restricted, and the application occasions of the permanent magnet type bearingless motor with the rotor core are limited.
At present, no-bearing motors all adopt neodymium-iron-boron permanent magnets, but because of the characteristics of the neodymium-iron-boron permanent magnets, the air-gap magnetic field of the motor cannot be adjusted, the speed regulation range is greatly limited, and the application of the motor in wide speed regulation occasions is limited to a certain extent. Recently, some researchers propose a memory permanent magnet (such as alnico), and the magnetization state of the permanent magnet is changed by applying a direct current pulse, so that magnetization and demagnetization are realized, and further, the air-gap magnetic field is regulated. However, a set of magnetic regulating windings is additionally arranged in the stator core winding, so that winding space is occupied, and the motor structure is more complex.
Disclosure of Invention
The invention provides a bearingless magnetic flux reversing permanent magnet motor with adjustable magnetism and a control method, which aim to solve the technical problems that in the prior art, an air gap field of a bearingless motor adopting neodymium-iron-boron permanent magnets cannot be adjusted and a bearingless motor adopting a memory permanent magnet needs to be additionally provided with a set of magnetism adjusting windings when the air gap field is adjusted. The positions and magnetizing directions of the neodymium-iron-boron permanent magnets and the aluminum-nickel-cobalt permanent magnets are ingeniously arranged, so that a closed magnetic circuit can be formed between the neodymium-iron-boron permanent magnets embedded on adjacent stator teeth and the surface-mounted neodymium-iron-boron permanent magnets; and then based on radial magnetization of the alnico permanent magnet (controlling the magnetization direction to be radial inward or radial outward), the air-gap field adjustment of the bearingless magnetic flux reversing permanent magnet motor is realized.
Therefore, the technical scheme of the invention provides a bearingless magnetic flux reversing permanent magnet motor with adjustable magnetism, which at least comprises a stator iron core, a rotor iron core, a winding, a NdFeB permanent magnet and an AlNiCo permanent magnet; an air gap is arranged between the stator core and the rotor core, the stator core is of a salient pole structure, stator teeth facing the rotor core are arranged on the stator core, and the windings are wound on the stator teeth;
the left side and the right side of the tooth top end of each stator tooth are respectively surface-attached with a neodymium-iron-boron permanent magnet, the magnetizing directions of the neodymium-iron-boron permanent magnets on the same stator tooth are the same, and the magnetizing directions of the neodymium-iron-boron permanent magnets on adjacent stator tooth are opposite; an alnico permanent magnet is arranged at the tail end of the yoke part of each stator tooth, neodymium iron boron permanent magnets are arranged at the two sides of each alnico permanent magnet, the magnetizing direction of the alnico permanent magnets is radial magnetizing, and a closed magnetic circuit can be formed between the neodymium iron boron permanent magnets embedded at the tail end of the upper yoke part of each adjacent stator tooth and the neodymium iron boron permanent magnets attached to the top end surface of the tooth part.
Further alternatively, the neodymium-iron-boron permanent magnet at the tail end of the yoke part and the alnico permanent magnet are arranged at an included angle.
Further alternatively, the included angle between the neodymium-iron-boron permanent magnet and the alnico permanent magnet embedded at the tail end of the yoke part is 120 degrees.
Further alternatively, the magnetizing direction of the neodymium-iron-boron permanent magnet embedded at the tail end of the yoke part is parallel to the lower edge line of the stator slot, and the magnetizing direction of the neodymium-iron-boron permanent magnet embedded at the tail end of the yoke part on the adjacent stator teeth is relatively inward and outwards away from each other.
Further alternatively, the stator core is provided with two sets of windings, which are respectively used as a torque winding and a suspension winding, and the two sets of windings are wound separately; six sets of coils in a set of windings embedded on the stator iron core are sequentially wound on stator teeth according to the sequence of A1-C2-B1-A2-C1-B2 to form a torque winding, the A1-A2 coils are connected in series to form an A-phase torque winding, the B1-B2 coils are connected in series to form a B-phase torque winding, the C1-C2 coils are connected in series to form a C-phase torque winding, and alternating current is injected into the A, B, C three-phase torque winding to generate electromagnetic torque;
six coils in another set of windings embedded on the stator iron core are arranged anticlockwise along the circumference of the stator iron core and are a1-c2-b1-a2-c1-b2 respectively, wherein the a1 coil and the a2 coil are reversely connected to form an a-phase suspension winding, the b1 coil and the b2 coil are reversely connected to form a b-phase suspension winding, the c1 coil and the c2 coil are reversely connected to form a c-phase suspension winding, and suspension current is injected into the a, b and c-phase suspension windings.
In the technical scheme of the invention, the torque winding and the levitation winding are preferably controlled independently, so that natural decoupling of levitation force and torque is realized, and the control of levitation force and torque is simpler and more convenient. The current which is introduced into the a, b and c three-phase suspension windings can be reasonably controlled according to the required suspension force, so that the stable suspension of the rotor core is realized.
Further alternatively, the stator core is of a 6-slot structure, the rotor core is of a 10-pole structure, 10 modulation slots on the rotor core are uniformly distributed along the circumference, the central angle corresponding to the circular arc of each modulation slot is 18 degrees, and the central angle corresponding to the circular arc of each salient pole big tooth on the stator core is 50 degrees.
Further alternatively, the central angle corresponding to the neodymium-iron-boron permanent magnet attached to the top end of the tooth part of the stator tooth is 19 degrees.
Further alternatively, the stator core and the rotor core are each formed by laminating silicon steel sheets.
In two aspects, the technical scheme of the invention provides a control method based on the bearingless flux reversing permanent magnet motor, which comprises the following steps:
the magnetization direction of the alnico permanent magnet is regulated to be radial inward or radial outward by controlling zero sequence current pulse in the winding, so that the magnetization and demagnetization regulation of the air gap field is realized;
the magnetic flux generated by the alnico permanent magnet and the magnetic flux generated by the neodymium-iron-boron permanent magnet are in the same direction, are mutually overlapped and are in a magnetism increasing state; otherwise, in a demagnetized state.
Further optionally, if a positive zero sequence current pulse is applied, the magnetization direction of the alnico permanent magnet is radial inward, so that when the magnetic flux generated by the alnico permanent magnet is the same as the magnetic flux generated by the closed magnetic circuit of the neodymium-iron-boron permanent magnet, the bearingless magnetic flux reversing permanent magnet motor is in a magnetization state;
and if negative zero-sequence current pulse is applied, the magnetization direction of the AlNiCo permanent magnet is radial outwards, so that when the magnetic flux generated by the AlNiCo permanent magnet deviates from the magnetic flux direction generated by the closed magnetic circuit of the NdFeB permanent magnet, the bearingless magnetic flux reversing permanent magnet motor is in a demagnetizing state.
Advantageous effects
The technical obstacle that the air-gap field of the bearingless motor adopting the neodymium-iron-boron permanent magnet cannot be adjusted and the bearingless motor adopting the memory permanent magnet needs to be additionally provided with a set of magnetic adjusting windings in the prior art is overcome by the bearingless magnetic flux reversing permanent magnet motor with adjustable magnetism. According to the technical scheme, the neodymium-iron-boron permanent magnet and the alnico permanent magnet are simultaneously distributed on the stator iron core, and the positions and the magnetizing directions of the neodymium-iron-boron permanent magnet and the alnico permanent magnet are skillfully set, so that the motor can realize air gap magnetic field regulation even if a magnetic regulating winding is not additionally arranged, namely, the magnetizing direction of the alnico permanent magnet is controlled to be radial inward or radial outward by controlling zero sequence current in the existing winding, thereby regulating the direction relation between magnetic flux generated by the alnico permanent magnet and magnetic flux generated by a closed magnetic circuit of the neodymium-iron-boron permanent magnet, realizing magnetism increasing or demagnetization, omitting the magnetic regulating winding, maximally utilizing a slot space and improving the performance of the motor.
Drawings
FIG. 1 is a three-dimensional block diagram of an adjustable magnetic bearingless flux reversing stator permanent magnet motor of the present invention;
FIG. 2 is a two-dimensional plan view of the adjustable magnetic bearingless flux reversing stator permanent magnet motor of the present invention;
FIG. 3 is a magnetic flux diagram of the motor in the state of magnetization of the alnico permanent magnet according to the present invention;
FIG. 4 is a magnetic flux diagram of an AlNiCo permanent magnet demagnetizing state motor according to the present invention;
fig. 5 is a suspension schematic of the present invention.
Wherein, the reference numerals are as follows:
1 is a stator core, 2 is a rotor core, 3 is a winding, 4 is a neodymium-iron-boron permanent magnet, and 5 is an alnico permanent magnet.
Detailed Description
The invention aims to solve the technical problems that in the prior art, an air gap field of a bearingless motor adopting a neodymium-iron-boron permanent magnet cannot be adjusted, and a bearingless motor adopting a memory permanent magnet needs to be additionally provided with a set of magnetic regulating windings when the air gap field is adjusted, and the respective advantages of the neodymium-iron-boron permanent magnet and an alnico permanent magnet are fully utilized, and creatively provides a bearingless magnetic flux reversing permanent magnet motor adopting the neodymium-iron-boron permanent magnet and the alnico permanent magnet at the same time, and solves the technical problems by improving the structure of a motor body. Specifically, the position and magnetizing direction of the neodymium-iron-boron permanent magnet and the aluminum-nickel-cobalt permanent magnet on the stator iron core are skillfully distributed, the magnetizing direction of the aluminum-nickel-cobalt permanent magnet is controlled by controlling the zero sequence current in the existing torque winding, a magnetism regulating winding is omitted, the slot space is utilized to the greatest extent, and the performance of the motor is improved. The invention will be further illustrated with reference to examples.
Fig. 1 is a three-dimensional structure diagram of a bearingless magnetic flux reversing stator permanent magnet motor of the invention, which adopts a stator core 6 slot/rotor core 10 pole and comprises a stator core 1, a rotor core 2, a winding 3, a neodymium-iron-boron permanent magnet 4 and an alnico permanent magnet 5. The stator core 1 is of a salient pole structure and is provided with 6 salient pole big teeth, and the central angle corresponding to the circular arc of each salient pole big tooth is 50 degrees; the rotor core 2 is of a salient pole structure, 10 modulation teeth are all distributed uniformly along the circumference of the rotor core, the central angle corresponding to the circular arc of each modulation tooth is 18 degrees, the rotor core 2 is free of permanent magnets, and the whole rotor core is formed by laminating silicon steel sheets; each big tooth of the stator core is adhered with two neodymium-iron-boron permanent magnets, the corresponding central angle of each neodymium-iron-boron permanent magnet is 19 degrees, the magnetizing directions of the neodymium-iron-boron permanent magnets are radial magnetizing, the magnetizing directions of the neodymium-iron-boron permanent magnets on the same big tooth are the same, and the magnetizing directions of the neodymium-iron-boron permanent magnets on adjacent big teeth are opposite. The yoke part of the stator core 1 is provided with a neodymium-iron-boron permanent magnet 4 and an alnico permanent magnet 5, the arrangement modes of the two permanent magnets are shown in fig. 2, the magnetizing direction of the neodymium-iron-boron permanent magnet 4 is parallel to the lower edge line of the stator slot, the angle between the neodymium-iron-boron permanent magnet 4 and the alnico permanent magnet 5 is 120 degrees, the magnetizing direction of the alnico permanent magnet 5 is radial magnetizing, and a closed magnetic circuit can be formed between the neodymium-iron-boron permanent magnet embedded on the adjacent stator teeth and the neodymium-iron-boron permanent magnet attached to the surface. The air gap between the stator core 1 and the rotor core 2 is 2mm. As shown in fig. 2.
It should be appreciated that the central angle and the air gap size described above are preferred parameters for this embodiment, and in other possible embodiments, may be adapted according to accuracy.
The technical scheme of the invention preferably adopts a double-winding structure, namely, the stator core is provided with two sets of windings which are respectively used as a torque winding and a suspension winding, and the two sets of windings are wound separately. As shown in FIG. 2, the A1 coil and the A2 coil are connected in series in the forward direction to form an A-phase torque winding, the B1 coil and the B2 coil are connected in series in the forward direction to form a B-phase torque winding, the C1 coil and the C2 coil are connected in series in the forward direction to form a C-phase torque winding, and the current introduced into the A-phase torque end is as followsThe phase of the B phase and the phase of the C phase are sequentially behind the phase of the A phase by 120 degrees, wherein I t For the torque current amplitude, ω is the electrical frequency of the torque current, θ r Is the phase of the torque current. The three phases of A phase, B phase and C phase are controlled independently and do not affect each other.
Similarly, a set of suspension windings are also wound on the stator core, six sets of coils are respectively arranged anticlockwise along the circumference of the stator core, namely a1-c2-b1-a2-c1-b2, wherein the a1 coil and the a2 coil are reversely connected to form an a-phase suspension winding, the b1 coil and the b2 coil are reversely connected to form a b-phase suspension winding, the c1 coil and the c2 coil are reversely connected to form a c-phase suspension winding, the a, b and c three-phase suspension windings are independently controlled, and the current fed into the a, b and c three-phase suspension windings can be reasonably controlled according to the required suspension force, so that the stable suspension of the rotor core is realized, and the stable suspension force is generated.
Therefore, based on the double-winding structure, the stable rotation operation of the motor rotor core can be realized by controlling the current in the torque winding of the stator core; by controlling the levitation current in the levitation winding of the stator core, levitation of the motor rotor core in both directions XY can be achieved. The levitation winding and the torque winding are wound on the stator core separately, so that natural decoupling of levitation force and torque is realized, and the control method is simpler and more convenient. It should be understood that, on the basis of satisfying the core technical thought of the invention (meanwhile, arranging the neodymium-iron-boron permanent magnet and the alnico permanent magnet on the stator core, and skillfully arranging the positions and magnetizing directions of the neodymium-iron-boron permanent magnet and the alnico permanent magnet, so that the motor can realize air gap magnetic field adjustment even without adding a magnetic adjustment winding), the arrangement modes of the suspension winding and the torque winding in other feasible modes are also satisfying the requirements of the invention, and fall into the protection scope of the invention.
In the magnetizing direction of the bearingless flux reversing permanent magnet motor shown in fig. 3, the bearingless flux reversing permanent magnet motor in fig. 3 is in an overall magnetizing state, the magnetizing direction of the neodymium-iron-boron permanent magnet pasted on the large tooth surface of the No. 1 stator tooth is radial inward, the magnetizing direction of the corresponding neodymium-iron-boron permanent magnet in the No. 1 stator core is from right to left and parallel to the bottom line of the stator slot, the magnetizing direction of the permanent magnet pasted on the large tooth surface of the No. 2 stator core is radial outward, and the magnetizing direction of the corresponding neodymium-iron-boron permanent magnet in the No. 2 stator core is parallel to the bottom line of the stator slot. At this time, the zero sequence current pulse in the torque winding makes the magnetization direction of the alnico permanent magnet under the stator tooth No. 1 be radial inward, and makes the magnetization direction of the alnico permanent magnet under the stator tooth No. 2 be radial outward; the magnetic flux generated by the alnico permanent magnet and the magnetic flux generated by the neodymium-iron-boron permanent magnet have the same direction, are mutually overlapped and are in a magnetism increasing state.
In the magnetizing direction of the bearingless flux reversing permanent magnet motor shown in fig. 4, fig. 4 is in an overall demagnetizing state, the magnetizing direction of the neodymium-iron-boron permanent magnet pasted on the large tooth surface of the No. 1 stator tooth is radial inward, and the magnetizing direction of the corresponding neodymium-iron-boron permanent magnet in the No. 1 stator core is magnetized along the inner part of the stator core and is parallel to the bottom line of the stator slot; the magnetization direction of the permanent magnet pasted on the large tooth surface of the No. 2 stator core is radial outwards, and the magnetization direction of the corresponding NdFeB permanent magnet in the No. 2 stator core is parallel to the bottom line of the stator slot outwards; at this time, the zero sequence current pulse in the torque winding makes the magnetization direction of the AlNi-Co permanent magnet under the No. 1 stator tooth be radial outward, and the magnetization direction of the AlFe-B permanent magnet under the No. 2 stator tooth be radial inward. At this time, the magnetic flux generated by the alnico permanent magnet and the magnetic flux generated by the neodymium-iron-boron permanent magnet form a short circuit loop at the yoke part of the stator core, so that the magnetic flux in the stator core is reduced, and the whole stator core is in a demagnetized state.
Fig. 3 and 4 are schematic illustrations for explaining the magnetization and demagnetization states. Wherein, the identification of magnetization or demagnetization is determined by the increase or decrease of the magnetic flux inside the stator core. The corresponding control method comprises the following steps:
the magnetization direction of the alnico permanent magnet is regulated to be radial inward or radial outward by controlling zero sequence current pulse in the winding, so that the magnetization and demagnetization regulation of the air gap field is realized; the magnetic flux generated by the alnico permanent magnet and the magnetic flux generated by the neodymium-iron-boron permanent magnet are in the same direction, are mutually overlapped and are in a magnetism increasing state; otherwise, in a demagnetized state.
If positive zero-sequence current pulse is applied, the magnetization direction of the alnico permanent magnet is radial inward, so that when the magnetic flux generated by the alnico permanent magnet is the same as the magnetic flux generated by the closed magnetic circuit of the neodymium-iron-boron permanent magnet, the bearingless magnetic flux reversing permanent magnet motor is in a magnetization state; and if negative zero-sequence current pulse is applied, the magnetization direction of the AlNiCo permanent magnet is radial outwards, so that when the magnetic flux generated by the AlNiCo permanent magnet deviates from the magnetic flux direction generated by the closed magnetic circuit of the NdFeB permanent magnet, the bearingless magnetic flux reversing permanent magnet motor is in a demagnetizing state.
It should be further noted that, in the technical solution of the present invention, a levitation winding is provided, and stable levitation is achieved by controlling a levitation current injected into the levitation winding, and it should be understood that levitation control is a conventional means in the art by controlling a levitation current, and thus, a specific description thereof will not be given. As shown in fig. 5, for example, the levitation control is illustrated, in fig. 5, the direction of magnetic flux generated by the permanent magnets on the stator teeth where the A1 winding and the A2 winding are located is from right to left, and when levitation current is introduced into the levitation end of the A1 winding, the generated magnetic flux is the same as the direction of magnetic flux generated by the permanent magnets on the A1 stator teeth, so that the magnetic flux is increased from right to left; when a2 winding suspension end is supplied with suspension current, the generated magnetic flux is opposite to the magnetic flux generated by the permanent magnet on the a2 stator tooth, and the magnetic flux is demagnetized from left to right, so that radial force along the X-axis negative direction is generated, and the rotor core is displaced towards the X-axis negative direction. In the same principle, radial force along the Y-axis direction can be generated, so that the rotor core can be displaced along the Y-axis direction.
It should be emphasized that the examples described herein are illustrative rather than limiting, and that this invention is not limited to the examples described in the specific embodiments, but is capable of other embodiments in accordance with the teachings of the present invention, as long as they do not depart from the spirit and scope of the invention, whether modified or substituted, and still fall within the scope of the invention.
Claims (10)
1. The utility model provides a bearingless magnetic flux reverse permanent magnet machine of adjustable magnetism which characterized in that: the permanent magnet at least comprises a stator core, a rotor core, a winding, a neodymium-iron-boron permanent magnet and an alnico permanent magnet; an air gap is arranged between the stator core and the rotor core; the stator core is of a salient pole structure, stator teeth facing the rotor core are arranged on the stator core, and the windings are wound on the stator teeth;
the left side and the right side of the tooth top end of each stator tooth are respectively surface-attached with a neodymium-iron-boron permanent magnet, the magnetizing directions of the neodymium-iron-boron permanent magnets on the same stator tooth are the same, and the magnetizing directions of the neodymium-iron-boron permanent magnets on adjacent stator tooth are opposite; an alnico permanent magnet is arranged at the tail end of the yoke part of each stator tooth, neodymium iron boron permanent magnets are arranged at the two sides of each alnico permanent magnet, the magnetizing direction of the alnico permanent magnets is radial magnetizing, and a closed magnetic circuit can be formed between the neodymium iron boron permanent magnets embedded at the tail end of the upper yoke part of each adjacent stator tooth and the neodymium iron boron permanent magnets attached to the top end surface of the tooth part.
2. The bearingless flux reversing permanent magnet machine of claim 1, wherein: the neodymium-iron-boron permanent magnet at the tail end of the yoke part and the alnico permanent magnet are arranged at an included angle.
3. The bearingless flux reversing permanent magnet machine of claim 2, wherein: the included angle between the neodymium-iron-boron permanent magnet and the alnico permanent magnet embedded at the tail end of the yoke part is 120 degrees.
4. The bearingless flux reversing permanent magnet machine of claim 1, wherein: the magnetizing direction of the neodymium-iron-boron permanent magnet embedded at the tail end of the yoke part is parallel to the lower edge line of the stator groove, and the magnetizing direction of the neodymium-iron-boron permanent magnet embedded at the tail end of the yoke part on the adjacent stator teeth is relatively inward and outward in a deviating way.
5. The bearingless flux reversing permanent magnet machine of claim 1, wherein: two sets of windings are arranged on the stator core and are respectively used as a torque winding and a suspension winding, and the two sets of windings are wound separately; six sets of coils in a set of windings embedded on the stator iron core are sequentially wound on stator teeth according to the sequence of A1-C2-B1-A2-C1-B2 to form a torque winding, the A1-A2 coils are connected in series to form an A-phase torque winding, the B1-B2 coils are connected in series to form a B-phase torque winding, the C1-C2 coils are connected in series to form a C-phase torque winding, and alternating current is injected into the A, B, C three-phase torque winding to generate electromagnetic torque;
six coils in another set of windings embedded on the stator iron core are arranged anticlockwise along the circumference of the stator iron core and are a1-c2-b1-a2-c1-b2 respectively, wherein the a1 coil and the a2 coil are reversely connected to form an a-phase suspension winding, the b1 coil and the b2 coil are reversely connected to form a b-phase suspension winding, the c1 coil and the c2 coil are reversely connected to form a c-phase suspension winding, and suspension current is injected into the a, b and c-phase suspension windings.
6. The bearingless flux reversing permanent magnet machine of claim 1, wherein: the stator iron core is of a 6-slot structure, the rotor iron core is of a 10-pole structure, 10 modulation slots on the rotor iron core are uniformly distributed along the circumference, the central angle corresponding to the circular arc of each modulation slot is 18 degrees, and the central angle corresponding to the circular arc of each salient pole big tooth on the stator iron core is 50 degrees.
7. The bearingless flux reversing permanent magnet machine of claim 1, wherein: the central angle corresponding to the neodymium-iron-boron permanent magnet attached to the top end of the tooth part of the stator tooth is 19 degrees.
8. The bearingless flux reversing permanent magnet machine of claim 1, wherein: the stator core and the rotor core are formed by laminating silicon steel sheets.
9. A control method based on the bearingless flux reversing permanent magnet motor according to any one of claims 1 to 8, characterized in that: comprising the following steps: the magnetization direction of the alnico permanent magnet is regulated to be radial inward or radial outward by controlling zero sequence current pulse in the winding, so that the magnetization and demagnetization regulation of the air gap field is realized;
the magnetic flux generated by the alnico permanent magnet and the magnetic flux generated by the neodymium-iron-boron permanent magnet are in the same direction, are mutually overlapped and are in a magnetism increasing state; otherwise, in a demagnetized state.
10. The control method according to claim 9, characterized in that: if positive zero sequence current pulse is applied, the magnetization direction of the alnico permanent magnet is radial inward, so that when the magnetic flux generated by the alnico permanent magnet is the same as the magnetic flux generated by the closed magnetic circuit of the neodymium-iron-boron permanent magnet, the bearingless magnetic flux reversing permanent magnet motor is in a magnetism increasing state;
and if negative zero-sequence current pulse is applied, the magnetization direction of the AlNiCo permanent magnet is radial outwards, so that when the magnetic flux generated by the AlNiCo permanent magnet deviates from the magnetic flux direction generated by the closed magnetic circuit of the NdFeB permanent magnet, the bearingless magnetic flux reversing permanent magnet motor is in a demagnetizing state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310942515.2A CN116914957A (en) | 2023-07-30 | 2023-07-30 | Magnetic-adjustable bearingless magnetic flux reversing permanent magnet motor and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310942515.2A CN116914957A (en) | 2023-07-30 | 2023-07-30 | Magnetic-adjustable bearingless magnetic flux reversing permanent magnet motor and control method |
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| CN202310942515.2A Pending CN116914957A (en) | 2023-07-30 | 2023-07-30 | Magnetic-adjustable bearingless magnetic flux reversing permanent magnet motor and control method |
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| Country | Link |
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| CN (1) | CN116914957A (en) |
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- 2023-07-30 CN CN202310942515.2A patent/CN116914957A/en active Pending
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