CN116154989A - Natural electromagnetic magnetic suspension three-phase permanent magnet motor - Google Patents

Natural electromagnetic magnetic suspension three-phase permanent magnet motor Download PDF

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Publication number
CN116154989A
CN116154989A CN202310255510.2A CN202310255510A CN116154989A CN 116154989 A CN116154989 A CN 116154989A CN 202310255510 A CN202310255510 A CN 202310255510A CN 116154989 A CN116154989 A CN 116154989A
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CN
China
Prior art keywords
permanent magnet
winding
phase
stator
stator core
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Pending
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CN202310255510.2A
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Chinese (zh)
Inventor
赵辉
杨贵杰
苏健勇
李铁才
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN202310255510.2A priority Critical patent/CN116154989A/en
Publication of CN116154989A publication Critical patent/CN116154989A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/16—Stator cores with slots for windings
    • H02K1/165—Shape, form or location of the slots
    • 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
    • H02K1/2791—Surface mounted magnets; Inset magnets
    • 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
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

The invention discloses a natural electromagnetic magnetic suspension three-phase permanent magnet motor, and relates to a motor. The magnetic suspension motor aims to solve the problems of complex control structure and high motor loss of a magnetic suspension bearing in the existing magnetic suspension motor, and comprises a stator iron core, a stator winding and a rotor permanent magnet; the stator winding is wound on the teeth of the stator core; the rotor permanent magnet is coaxially sleeved outside the stator iron core and the stator winding, and an electromagnetic air gap exists between the rotor permanent magnet and the stator iron core; the stator winding is a three-phase winding, and each phase winding comprises 2 branch windings; the 6 branch windings are uniformly distributed along the circumferential direction of the stator core; the 2 branch windings in each phase winding are arranged in a central symmetry way by taking the center of the stator core as a symmetry center; and 2 branch windings in each phase winding are connected in parallel.

Description

Natural electromagnetic magnetic suspension three-phase permanent magnet motor
Technical Field
The present invention relates to an electric motor.
Background
Existing motors all have bearings. However, in special cases, the friction is not allowed or is desired to be as low as possible, in which case a magnetic levitation motor is required. In a general magnetic suspension motor, the volume of the magnetic suspension bearing occupies about 60 percent, so that larger space and weight are occupied, and the motor loss is overlarge in the running process. And the magnetic suspension bearing needs to be provided with a corresponding sensor and a corresponding controller, so that the control structure of the magnetic suspension bearing is complex.
Disclosure of Invention
The invention aims to solve the problems of complex control structure and high motor loss of a magnetic suspension bearing in the existing magnetic suspension motor, and provides a natural electromagnetic magnetic suspension three-phase permanent magnet motor.
The invention provides a natural electromagnetic magnetic suspension three-phase permanent magnet motor, which comprises a stator core, a stator winding and a rotor permanent magnet;
the stator winding is wound on the teeth of the stator core;
the rotor permanent magnet is coaxially sleeved outside the stator iron core and the stator winding, and an electromagnetic air gap exists between the rotor permanent magnet and the stator iron core;
the stator winding is a three-phase winding, and each phase winding comprises 2 branch windings; the 6 branch windings are uniformly distributed along the circumferential direction of the stator core; the 2 branch windings in each phase winding are arranged in a central symmetry way by taking the center of the stator core as a symmetry center;
and 2 branch windings in each phase winding are connected in parallel.
The invention also provides a natural electromagnetic magnetic suspension three-phase permanent magnet motor, which comprises a stator core, a stator winding and a rotor permanent magnet;
the stator winding is wound on the teeth of the stator core;
the rotor permanent magnet is coaxially sleeved outside the stator iron core and the stator winding, and an electromagnetic air gap exists between the rotor permanent magnet and the stator iron core;
the stator winding is a three-phase winding which is uniformly distributed along the circumferential direction of the stator core;
each phase winding comprises 56 pairs of branch windings, and each pair of branch windings is arranged in a central symmetry way by taking the center of the stator core as a symmetry center;
and, 56 pairs of head ends of the branch windings in each phase winding are connected in parallel to form a synthetic port of the corresponding phase winding; each phase 56 is connected in parallel with the tail ends of the leg windings to form a composite midpoint for the corresponding phase winding.
Further, the natural electromagnetic magnetic suspension three-phase permanent magnet motor is a fractional slot concentrated winding motor, the slot number Z=336 of the stator core, and the ratio of the slot number Z to the phase number m of the stator winding is even.
Further, when the pole pair number P is even, 2 branch windings in each phase winding are electrically connected in parallel in a manner of synonym end electrical connection;
when the pole pair number P is odd, 2 branch windings in each phase winding are connected in parallel in an electric connection mode of the same name end.
Further, each branch winding comprises 28 adjacent sub-windings, and the 28 adjacent sub-windings are sequentially connected in series.
Further, the stator core is divided into at least k sections along the axial direction; the rotor permanent magnet is divided into k sections along the axial direction; and each section of the stator core corresponds to each section of the rotor permanent magnet; k is a positive integer of 3 or more.
Further, the stator core has a segment gap lambda d = (1-2) delta, the segment gap of the rotor permanent magnet is lambda r ＝λ d Where δ is the electromagnetic air gap.
Further, the stator core has a segment gap lambda d = (1-2) delta, the clearance between each of two sections at the axial two ends of the rotor permanent magnet and the adjacent section is lambda rd ＝(1.5～2)λ d The method comprises the steps of carrying out a first treatment on the surface of the Other segment gaps of the rotor permanent magnet are lambda r ＝λ d The method comprises the steps of carrying out a first treatment on the surface of the Where δ is the electromagnetic air gap.
Further, the power supply also comprises a variable frequency power supply;
and the variable frequency power supply is used for supplying power to the stator winding.
Further, the conductive layer is also included;
the conductive layer is of a squirrel cage structure and is sleeved on the outer side wall of the rotor permanent magnet;
and the conductive layer is made of non-magnetic metal.
The beneficial effects of the invention are as follows:
on the premise of not adding any sensor and controller, the invention can realize radial natural dynamic electromagnetic magnetic suspension and axial passive magnetic suspension by combining the motor windings in series-parallel connection and matching with the iron core segment, can realize the self-weight unloading of the motor with the bearing, prolongs the service life of the bearing, reduces the noise and reduces the motor loss so as to save energy.
Drawings
FIG. 1 is a schematic diagram of a cross-sectional structure of a natural electromagnetic maglev three-phase permanent magnet motor of the present invention;
FIG. 2 is a schematic structural diagram of a first winding connection method in the natural electromagnetic maglev three-phase permanent magnet motor of the present invention;
fig. 3 is a schematic structural diagram of a second winding connection method in the natural electromagnetic magnetic suspension three-phase permanent magnet motor of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Detailed description of the preferred embodiments
The natural electromagnetic magnetic suspension three-phase permanent magnet motor of the embodiment comprises a stator core 1, a stator winding 2 and a rotor permanent magnet 3;
the stator winding 2 is wound on the teeth of the stator core 1;
the rotor permanent magnet 3 is coaxially sleeved outside the stator core 1 and the stator winding 2, and an electromagnetic air gap exists between the rotor permanent magnet 3 and the stator core 1;
the stator winding 2 is a three-phase winding, and each phase winding comprises 2 branch windings; the 6 branch windings are uniformly distributed along the circumferential direction of the stator core 1; the 2 branch windings in each phase winding are arranged in a central symmetry way by taking the center of the stator core 1 as a symmetry center;
and 2 branch windings in each phase winding are connected in parallel.
Detailed description of the preferred embodiments
The natural electromagnetic magnetic suspension three-phase permanent magnet motor of the embodiment comprises a stator core 1, a stator winding 2 and a rotor permanent magnet 3;
the stator winding 2 is wound on the teeth of the stator core 1;
the rotor permanent magnet 3 is coaxially sleeved outside the stator core 1 and the stator winding 2, and an electromagnetic air gap exists between the rotor permanent magnet 3 and the stator core 1;
the stator winding 2 is a three-phase winding which is uniformly distributed along the circumferential direction of the stator core 1;
each phase winding comprises 56 pairs of branch windings, and each pair of branch windings is arranged in a central symmetry way by taking the center of the stator core 1 as a symmetry center;
and, 56 pairs of head ends of the branch windings in each phase winding are connected in parallel to form a synthetic port of the corresponding phase winding; each phase 56 is connected in parallel with the tail ends of the leg windings to form a composite midpoint for the corresponding phase winding.
Detailed description of the preferred embodiments
In this embodiment, the natural electromagnetic levitation three-phase permanent magnet motor is a fractional-slot concentrated winding motor, the slot number z=336 of the stator core 1, and the ratio of the slot number Z to the phase number m of the stator winding 2 is an even number.
Other technical features of this embodiment are the same as those of embodiment one=completely.
Detailed description of the preferred embodiments
In this embodiment, when the pole pair number P is even, 2 branch windings in each phase winding are electrically connected in parallel by the synonym end;
when the pole pair number P is odd, 2 branch windings in each phase winding are connected in parallel in an electric connection mode of the same name end.
Other technical features of the present embodiment are exactly the same as those of the first or third embodiments.
Detailed description of the preferred embodiments
In this embodiment, each of the branch windings includes 28 adjacent sub-windings, and the 28 adjacent sub-windings are sequentially connected in series.
Other technical features of the present embodiment are exactly the same as those of the fourth embodiment.
Detailed description of the preferred embodiments six
This embodiment is a further explanation of the first or second embodiment, in which the stator core 1 is divided into at least k segments in the axial direction; the rotor permanent magnet 3 is divided into k sections along the axial direction; and each segment position of the stator core 1 corresponds to each segment position of the rotor permanent magnet 3; k is a positive integer of 3 or more.
Other technical features of the present embodiment are exactly the same as those of the first or second embodiment.
Detailed description of the preferred embodiments
In this embodiment, the step gap of the stator core 1 is λ, which is a further explanation of the sixth embodiment d = (1-2) delta, the segment gap of the rotor permanent magnet 3 is lambda r ＝λ d Where δ is the electromagnetic air gap.
Other technical features of the present embodiment are exactly the same as those of the sixth embodiment.
Detailed description of the preferred embodiments
In this embodiment, the step gap of the stator core 1 is λ, which is a further explanation of the sixth embodiment d = (1-2) delta, the clearance between each of two sections at the two axial ends of the rotor permanent magnet 3 and the adjacent section is lambda rd ＝(1.5～2)λ d The method comprises the steps of carrying out a first treatment on the surface of the The other segment gap of the rotor permanent magnet 3 is lambda r ＝λ d The method comprises the steps of carrying out a first treatment on the surface of the Wherein delta is electromagnetic gasA gap.
Other technical features of the present embodiment are exactly the same as those of the sixth embodiment.
Detailed description of the preferred embodiments nine
The present embodiment is further described with respect to embodiments one to three, five, seven and eight, and in the present embodiment, a variable frequency power supply is further included;
the variable frequency power supply is used for supplying power to the stator winding 2.
Other technical features of the present embodiment are exactly the same as those of the first to third embodiments, the fifth embodiment, the seventh embodiment, and the eighth embodiment.
Detailed description of the preferred embodiments
This embodiment is a further explanation of embodiments one to three, five, seven, and eight, and further includes the conductive layer 4;
the conductive layer 4 is of a squirrel cage structure, and the conductive layer 4 is sleeved on the outer side wall of the rotor permanent magnet 3;
and the conductive layer 4 is made of non-magnetic metal.
Other technical features of the present embodiment are exactly the same as those of the first to third embodiments, the fifth embodiment, the seventh embodiment, and the eighth embodiment.
Examples
The invention provides a novel motor scheme, which only needs to adopt proper pole slot matching, and can realize radial natural dynamic electromagnetic magnetic suspension and axial passive magnetic suspension by combining motor windings in series and parallel and matching with iron core segments on the premise of not adding any sensor or controller. The device can be applied to energy storage flywheel, magnetic suspension train, all-electric aircraft turbine engine, ship hydraulic propeller, ultra-low noise submarine drive, ocean tide power generation, nuclear power, space and ultra-high speed application occasions.
The self-weight unloading device can realize self-weight unloading of any motor with a bearing, so that the service life of the bearing is prolonged, the noise is reduced, and the loss of the motor is reduced to save energy. Most typically: wind power generators, turbine or hydroelectric generators, compressor motors, vacuum cleaner motors, high-speed pulverizers, and the like.
There are many applications and demands for magnetically levitated precision rotating platforms. For example, simulating a vacuum revolution environment, and establishing a precise speed and acceleration environment for satellites, missiles and aircrafts. Various precision centrifuges and atmosphere centrifuges for military, industrial, biological, food and chemical industries.
The magnetic suspension can ensure the mechanical isolation of the stator body and the rotor body, and no moment transmission under mechanical friction exists. Natural electromagnetic magnetic levitation can enable a motor rotor to rotate in a state that energy loss tends to be minimum, vibration and noise are minimum at the moment, and the motor rotor can naturally rotate in space like the earth and the sun.
The motor is a fractional slot concentrated winding motor, the ratio Z/m of the slot number and the phase number is even, therefore, each phase winding of the motor can form windings which are symmetrically distributed along the circumference by 180 degrees, and can generate couple moment which is symmetrical by 180 degrees, the slot number Z=336, the pole pair number P=166 and the phase number m=3 of the motor are formed by a stator iron core 1, a stator winding 2 and a rotor permanent magnet 3, and the motor is characterized in that: the motor stator core 1 is divided into three or more sections so as to obtain larger passive magnetic levitation capacity in the axial direction, and the invention adopts 5 sections; the stator winding 2 does not have to be segmented with stator core segments.
In the first winding connection method, each phase of the stator winding 2 is divided into Kpm =z/3m=4 groups of windings symmetrically distributed along the circumference 180 degrees, each group has adjacent 28 windings, the winding tails are connected in series, the adjacent 28 windings are connected in series to form a branch, and the other three groups of windings of the phase are similarly connected in the same way: then connecting the winding tails of each group of adjacent 28 windings in series, and connecting the adjacent 28 windings in series to form a branch; then connecting two symmetrical branches formed by two groups of windings symmetrically distributed at 180 degrees into parallel branch windings; the parallel principle is as follows: when the pole pair number P is even, the two parallel branch windings are connected in parallel according to the head-tail different name ends, when P is odd, the two parallel branch windings are connected in parallel according to the head-head and tail-tail same name ends, and one end of the two parallel branch windings is used as the midpoint of the phase winding; the invention has even number of P, and two parallel branch windings are connected in parallel according to the different name ends of the head end and the tail end.
The U-phase winding of the invention has two orthogonal parallel branches, a midpoint and a U-phase winding port; similarly, three-phase windings of the motor are respectively formed into 180-degree symmetrical parallel branches according to the method; and U, V, W three-phase ports constituting three-phase windings and a midpoint of one three-phase winding. Namely, the special parallel branch three-phase windings which are symmetrically connected in parallel at 180 degrees are finally formed. The invention has two pairs of 180 DEG symmetrical parallel branches for each phase winding, and the currents in the 180 DEG symmetrical parallel branches are the same in principle when the stator and rotor air gaps are not deviated.
The attractive force exists between the stator core 1 and the rotor permanent magnet 3, the air gap between the stator and the rotor is kept equal due to the effect of the bearing, the attractive force is equal everywhere along the circumference, and the radial attractive force in the air gap of the motor is equal everywhere and counteracts each other through the bearing. However, if the motor rotates and the bearing fails, the air gaps at the two sides of 180 degrees are inevitably deviated, at the moment, the permanent magnet rotor body is sucked to the side with small air gap, the counter potential of the parallel branch at the side with small air gap is inevitably increased, and the current is reduced; conversely, the counter potential of the parallel branch on the side with the large air gap becomes smaller, the current becomes larger, the radial tension on the side with the large air gap becomes larger, and the radial tension on the side with the small air gap becomes smaller, which inevitably leads to the change of the air gap in the direction of smaller deviation, and stabilizes the deviation of the air gap. Therefore, after the motor rotates, the invention has the capability of radial natural magnetic suspension recovery centering. The slot number Z=336, the pole pair number P=166 and the phase number m=3, each phase is provided with two pairs of 180-degree symmetrical parallel branch windings, the three phases are provided with 6 pairs of 180-degree symmetrical parallel branch windings, and obviously, the motor rotor pair can be actively recovered from 12 directions; since the permanent magnet rotor is randomly attracted to the side with small air gap due to no counter potential and no radial natural magnetic suspension restoring force when the motor is not started and not rotated in an initial state, the permanent magnet rotor body is radially unstable when the motor is not started and rotated, and therefore, the starting protection bearing is needed to be used. Under the condition of no additional sensor or controller, the invention adopts the existing motor driving method to have perfect dynamic radial natural electromagnetic magnetic suspension and passive axial magnetic suspension functions.
In order to enable the motor rotor to have static electromagnetic magnetic levitation capability when not rotating, a variable frequency power supply can be used for driving the motor, at the moment, although the motor does not rotate and has no e=NBLV counter potential, a motor winding has dψ/dt induction potential, and the motor is enabled to have the static electromagnetic magnetic levitation capability based on the same principle.
The outer circumference of the motor rotor is sleeved with a layer of conducting layer, the conducting layer is similar to a squirrel cage winding, and the conducting layer can be made of the following materials: the invention changes the non-magnetic metallic materials such as aluminum, copper, stainless steel, etc. into a synchronous motor which can be started asynchronously by induction, the motor can be started asynchronously, and after reaching the vicinity of synchronous rotating speed, the motor automatically enters the synchronous motor to operate, and the motor really has: static and dynamic natural electromagnetic magnetic suspension motor.
The motor can be an outer rotor or an inner rotor motor, can be an existing permanent magnet motor or an asynchronous starting synchronous motor, and the tooth slot matching of the motor can be as follows: fractional slot concentrated winding motors, but also distributed winding motors, must be in accordance with claim 1: each phase winding of the motor can form windings which are symmetrically distributed along the circumference by 180 degrees, and can generate 180-degree symmetrical couple moment.
The motor stator core 1 is divided into five segments, the stator core segment gap λd=1 to 2 δ, where δ is the electromagnetic air gap of the motor, and the rotor core segment gap λr=λd.
The rotor core section gaps at the two ends of the rotor axial direction are slightly larger, and the rotor core section gaps are: λrd=1.5 to 2λr=1.5 to 2λd.
In the second winding connection method, the motor is a fractional slot concentrated winding motor, the ratio Z/m of the slot number to the phase number is even, therefore, each phase winding of the motor can form windings symmetrically distributed along the circumference of 180 degrees, and can generate a couple moment symmetrically distributed along the circumference of 180 degrees. The method is applicable to radial motors as well as axial motors; the method is complex in connection, but the natural magnetic suspension restoring force is the largest, and can be called as: full radial natural magnetic suspension motor.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other embodiments.

Claims (10)

1. The natural electromagnetic magnetic suspension three-phase permanent magnet motor comprises a stator core (1), a stator winding (2) and a rotor permanent magnet (3);
the stator winding (2) is wound on teeth of the stator core (1);
the rotor permanent magnet (3) is coaxially sleeved outside the stator core (1) and the stator winding (2), and an electromagnetic air gap exists between the rotor permanent magnet (3) and the stator core (1);
the stator winding (2) is a three-phase winding, and each phase winding comprises 2 branch windings; the 6 branch windings are uniformly distributed along the circumferential direction of the stator core (1); 2 branch windings in each phase winding are arranged in a central symmetry way by taking the center of the stator core (1) as a symmetry center;
and 2 branch windings in each phase winding are connected in parallel.
2. The natural electromagnetic magnetic suspension three-phase permanent magnet motor comprises a stator core (1), a stator winding (2) and a rotor permanent magnet (3);
the stator winding (2) is wound on teeth of the stator core (1);
the rotor permanent magnet (3) is coaxially sleeved outside the stator core (1) and the stator winding (2), and an electromagnetic air gap exists between the rotor permanent magnet (3) and the stator core (1);
the stator is characterized in that the stator winding (2) is a three-phase winding which is uniformly distributed along the circumferential direction of the stator core (1);
each phase winding comprises 56 pairs of branch windings, and each pair of branch windings is arranged in a central symmetry way by taking the center of the stator core (1) as a symmetry center;
and, 56 pairs of head ends of the branch windings in each phase winding are connected in parallel to form a synthetic port of the corresponding phase winding; each phase 56 is connected in parallel with the tail ends of the leg windings to form a composite midpoint for the corresponding phase winding.
3. A natural electromagnetic levitation three-phase permanent magnet motor according to claim 1, characterized in that the natural electromagnetic levitation three-phase permanent magnet motor is a fractional-slot concentrated winding motor, the number of slots z=336 of the stator core (1), and the ratio of the number of slots Z to the number of phases m of the stator winding (2) is even.
4. A natural electromagnetic levitation three-phase permanent magnet motor according to claim 1 or 3, wherein when the pole pair number P is even, 2 branch windings in each phase winding are electrically connected in parallel in a manner of being connected by a synonym;
when the pole pair number P is odd, 2 branch windings in each phase winding are connected in parallel in an electric connection mode of the same name end.
5. A natural electromagnetic levitation three-phase permanent-magnet machine according to claim 4 wherein each branch winding comprises 28 adjacent sub-windings, and the 28 adjacent sub-windings are connected in series in sequence.
6. A natural electromagnetic levitation three-phase permanent-magnet machine according to claim 1 or 2, characterized in that the stator core (1) is divided into at least k segments in axial direction; the rotor permanent magnet (3) is divided into k sections along the axial direction; and each section of the stator core (1) corresponds to each section of the rotor permanent magnet (3); k is a positive integer of 3 or more.
7. A natural electromagnetic maglev three-phase permanent magnet motor according to claim 6, characterized in that the stator core (1) has a segment gap λ d = (1-2) delta, the segment gap of the rotor permanent magnet (3) is lambda r ＝λ d Where δ is the electromagnetic air gap.
8. A natural electromagnetic maglev three-phase permanent magnet motor according to claim 6, characterized in that the stator core (1) has a segment gap λ d = (1-2) delta, the clearance between each of two sections at the two axial ends of the rotor permanent magnet (3) and the adjacent sections is lambda rd ＝(1.5～2)λ d The method comprises the steps of carrying out a first treatment on the surface of the The other segment gap of the rotor permanent magnet (3) is lambda r ＝λ d The method comprises the steps of carrying out a first treatment on the surface of the Where δ is the electromagnetic air gap.
9. The natural electromagnetic levitation three-phase permanent magnet motor of any of claims 1-3, 5, 7, 8, further comprising a variable frequency power supply;
the variable frequency power supply is used for supplying power to the stator winding (2).
10. A natural electromagnetic levitation three-phase permanent-magnet machine according to one of claims 1-3, 5, 7, 8, further comprising an electrically conductive layer (4);
the conductive layer (4) is of a squirrel cage structure, and the conductive layer (4) is sleeved on the outer side wall of the rotor permanent magnet (3);
and the conducting layer (4) is made of non-magnetic metal.
CN202310255510.2A 2023-03-16 2023-03-16 Natural electromagnetic magnetic suspension three-phase permanent magnet motor Pending CN116154989A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310255510.2A CN116154989A (en) 2023-03-16 2023-03-16 Natural electromagnetic magnetic suspension three-phase permanent magnet motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310255510.2A CN116154989A (en) 2023-03-16 2023-03-16 Natural electromagnetic magnetic suspension three-phase permanent magnet motor

Publications (1)

Publication Number Publication Date
CN116154989A true CN116154989A (en) 2023-05-23

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ID=86361933

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310255510.2A Pending CN116154989A (en) 2023-03-16 2023-03-16 Natural electromagnetic magnetic suspension three-phase permanent magnet motor

Country Status (1)

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CN (1) CN116154989A (en)

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