CN110635597A - Magnetic isolation mechanism of low-speed large-torque permanent magnet motor system - Google Patents
Magnetic isolation mechanism of low-speed large-torque permanent magnet motor system Download PDFInfo
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- CN110635597A CN110635597A CN201911010488.5A CN201911010488A CN110635597A CN 110635597 A CN110635597 A CN 110635597A CN 201911010488 A CN201911010488 A CN 201911010488A CN 110635597 A CN110635597 A CN 110635597A
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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
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/30—Reducing waste in manufacturing processes; Calculations of released waste quantities
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a magnetic isolation mechanism of a low-speed large-torque permanent magnet motor system, which comprises a rotor and a stator coaxial with the rotor, wherein the rotor comprises the magnetic isolation mechanism and a plurality of fan-shaped annular rotor punching sheets which are uniformly fixed on the outer side of the magnetic isolation mechanism and are not in contact with each other, magnetic steel position control mechanisms are respectively arranged on two radial side walls of the rotor punching sheets, magnetic steel grooves are formed between the adjacent rotor punching sheets, a plurality of pole shoes close to each other are arranged on the inner side of the stator, and an air gap between each pole shoe and the rotor punching sheet is 0.1 mm-3 mm. The invention has the beneficial effects that: after the rotor system is subjected to magnetic isolation treatment, the utilization rate of magnetic flux is improved by more than 10%, the torque loss is reduced, the material utilization rate is improved, the running reliability of the permanent magnet motor is improved, the magnetic steel consumption is reduced, and the cost is reduced.
Description
Technical Field
The invention belongs to the field of magnetism isolating technology in the technical field of permanent magnet motors, and particularly relates to a magnetism isolating mechanism of a low-speed large-torque permanent magnet motor system, which is applied to a permanent magnet motor.
Background
In permanent magnet motor design, the magnetic leakage becomes an important factor of magnetic energy pole loss, and at present, the main measures of solving embedded tangential magnetic circuit magnetic leakage include: the rotor manufactured by the prior art using the magnetic saturation principle can generate weak points on a rotor core structure, the rotor core cannot bear larger load and has limited capacity of reducing magnetic leakage, while the rotor manufactured by the non-magnetic material is connected with a rotor supporting part by screws, and the structure is not suitable for a low-speed high-torque permanent magnet motor because the screws cannot bear larger tangential load.
Wherein, Chinese utility model patent 201320284911.2 discloses a large permanent-magnet direct-drive wind power generator and a magnetism isolating structure thereof, the magnetism isolating structure comprises pole shoes, magnetism isolating plates and a pressing plate, the pole shoes are fixed on the magnetism isolating plates through the pressing plate, a magnetic steel fixing groove is formed between the pole shoes, the magnetism isolating plates are positioned below the magnetic steel fixing groove, the generator adopts a built-in magnetic pole type rotor, the magnetism isolating plates of the magnetism isolating structure are fixedly connected with a rotor structural member, and a connecting member, namely a bolt and the rotor structural member are separated by a gasket and a sleeve which are made of magnetism isolating materials, the magnetic steel of the rotor is fixed in the magnetic steel fixing groove of the magnetism isolating structure, the patent utilizes the principle of magnetic saturation to generate weak points on a rotor iron core structure, the rotor iron core can not bear larger load and reduce magnetic leakage capacity, and is connected with a wheel hub which is made of a non-magnetic material in a limited, since the screw cannot bear large tangential load, the structure is not suitable for a low-speed large-torque permanent magnet motor.
In summary, in order to improve the utilization rate of the magnetic flux and reduce the magnetic flux leakage caused by the unreasonable structure, the purpose of improving the utilization rate of the magnetic flux is achieved by changing the material and shape combination of the rotor system structure, and a magnetic isolation mechanism of a low-speed large-torque permanent magnet motor system is urgently needed to improve the utilization rate of the magnetic flux of the permanent magnet motor system.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a magnetic isolation mechanism of a low-speed large-torque permanent magnet motor system.
The invention adopts the following specific technical scheme:
the utility model provides a big moment of torsion permanent magnet motor system of low-speed separates magnetic mechanism, includes the rotor and with the coaxial stator of rotor, the rotor includes separates magnetic mechanism and evenly fixes a plurality of fan ring shape rotor punching not contact each other in separating the magnetic mechanism outside, two radial lateral walls of rotor punching are equipped with magnet steel position control mechanism respectively, form the magnetic steel groove between the adjacent rotor punching, the stator inboard is equipped with a plurality of pole shoes that are close to each other, the air gap between pole shoe and the rotor punching is 0.1mm to 3mm, and such design that it adopted is because:
the rotor comprises a magnetism isolating mechanism and a plurality of fan-shaped annular rotor punching sheets which are uniformly fixed on the outer side of the magnetism isolating mechanism and are not in contact with each other, the magnetism isolating mechanism is made of high-strength magnetism isolating materials and embedded with magnetic poles to improve magnetism isolating effect, the structure of the magnetic poles made into the fan-shaped annular rotor punching sheets can be made of amorphous gold materials, the amorphous gold is solidified by super-quenching, atoms are not in time to be orderly arranged and crystallized when the alloy is solidified, the obtained solid alloy is in a long-range disordered structure, crystal grains and crystal boundaries of crystalline alloy do not exist, the amorphous alloy has a plurality of unique performances, as the amorphous alloy has excellent performance and simple process, the iron-based amorphous alloy becomes the research and development key point of the domestic and foreign material science and science communities from 80 years, the iron-based amorphous alloy is composed of 80% of Fe, 20% of Si and B metal elements, and has the characteristics of high saturation magnetic induction intensity (1.54T), magnetic conductivity, excitation current, iron loss and the like, the amorphous alloy is fragile after being stamped and is difficult to form a large-size integral lamination, so that the magnetic pole is designed into a fan-shaped annular rotor punching sheet, the characteristic that amorphous gold is difficult to form a large-size integral lamination is utilized, the small-size lamination is supported, and then the small-size lamination is matched and assembled into a circular structure through a dovetail groove and other related structures and is embedded on the outer cylindrical surface of the magnetism isolating mechanism, so that the amorphous gold is used for replacing the traditional silicon steel sheet, and the advantages of the rotor in the aspects of magnetic conductivity, exciting current, iron loss and the like are further improved;
meanwhile, magnetic steel position control mechanisms are respectively arranged on two radial side walls of the rotor punching sheets, magnetic steel grooves are formed between the adjacent rotor punching sheets, so that the magnetic steels can be embedded in the magnetic steel grooves, and the magnetic steels are fixed in the magnetic steel grooves due to the existence of the magnetic steel limiting mechanisms, and the adjacent magnetic steel limiting mechanisms are not in contact with each other, so that a magnetic isolation magnetic bridge structure in the traditional structure is cancelled, namely the rotor punching sheets are connected into a whole with enough mechanical strength;
in addition, because the width of the main magnetic pole shoe is always smaller than one pole pitch, the air gap under the pole shoe is not uniform, therefore, the magnetic loops passed by each magnetic line of the main magnetic flux are different, the air gap in the magnetic loop near the magnetic pole axis is smaller, the air gap in the magnetic loop near the pole tip is larger, the magnetomotive force dissipated everywhere in the air gap is the excitation magnetomotive force, irrespective of the magnetic pressure drop in the ferromagnetic material, and therefore, the air gap under the pole shoe is small, the magnetic flux of each point on the rotor surface in the air gap is larger, the air gap is increased a lot outside the pole shoe range, the magnetic flux is reduced remarkably until the magnetic flux at the geometric neutral line between the two poles is zero, therefore, a plurality of pole shoes which are close to each other are arranged on the inner side of the stator, the range of the pole shoe is structurally enlarged, so that the magnetic flux in the range of the pole shoe is increased, the corresponding magnetic flux saturation degree is further increased, and the magnetic flux utilization rate is increased;
air gap refers to the gap between the stationary pole and the rotating armature, the size of the air gap, the size of the flux, if the air gap is large, the leakage flux is large, the efficiency of the motor is reduced, if the air gap is too small, the rotor is easy to touch the inner wall of the stator when rotating, wherein, in the small-capacity motor, the air gap is 0.5mm to 3mm, while the volume of the stator and the rotor of the low-speed large-torque permanent magnet motor is much larger than that of the small-capacity motor, therefore, the air gap is larger, the volume of the stator and the rotor is reduced relatively, and because the magnetic flux density at the air gap is relatively reduced, and partial magnetic flux is lost at a non-air gap, namely leakage flux, the magnetic resistance is generated in a magnetic circuit, so that the air gap distance is reduced, the leakage flux can be reduced, the magnetic flux density at the air gap is improved, when the air gap of the low-speed large-torque permanent magnet motor is reduced to 0.1 mm-3 mm, the magnetic flux density at the air gap can be effectively improved.
The magnetic steel position control mechanism is a flange which is close to one side of the inner ring surface of the rotor sheet and is a limiting plane, and most of the magnetic steel on the market is a regular polygon, so that the limiting structure which is close to one side of the inner ring surface of the rotor sheet and is the flange of the limiting plane can realize the cooperation between civilian and the plane, and the limiting effect on the magnetic steel is realized.
As a further improvement of the invention, the distance between the magnetic steel limiting plane of the magnetic steel position control mechanism and the end part of the excircle of the rotor is 1mm to 10mm, and the distance between the magnetic steel limiting plane of the magnetic steel position control mechanism and the end part of the excircle of the rotor is 1mm to 10mm according to different torques, so that the strength of the limiting mechanism is ensured, and the distance between the magnetic steel and the outer circumference of the rotor is ensured to be minimum, thereby improving the magnetic flux density in an air gap between a pole shoe and the rotor.
Preferably, the distance between the magnetic steel position control mechanism and the end part of the excircle of the rotor is 3mm to 8 mm.
As a further improvement of the invention, the magnetism isolating mechanism is a cylindrical magnetism isolating cylinder sleeved on the rotor shaft, and the magnetism isolating cylinder can be made of non-magnetic materials such as nonferrous metals and the like, so that the magnetic flux leakage of the rotor can be reduced.
As a further improvement of the invention, dovetail grooves for fixing the rotor punching sheets are uniformly arranged on the outer cylindrical surface of the magnetism isolating cylinder, dovetail protrusions are arranged on the inner annular surface of the rotor punching sheets, the structural strength of the dovetail grooves is high, and the dovetail grooves can bear large torque.
As a further improvement of the invention, the magnetism isolating cylinder is made of aluminum alloy, the aluminum alloy is a non-ferrous metal which is most widely applied in industrial production, the mechanical processing performance is good, the magnetic leakage of the rotor can be reduced, and the cost is reduced.
As a further improvement of the invention, the pole shoes are of a fan-ring structure, the distance between the adjacent pole shoes is less than or equal to 0.5mm, and the distance between the adjacent pole shoes is reduced, so that the range of the pole shoes can be effectively enlarged structurally, the magnetic flux in the range of the pole shoes is increased, the corresponding magnetic flux saturation degree is further increased, and the magnetic flux utilization rate is increased.
The invention has the positive effects that: after the rotor system is subjected to magnetic isolation treatment, the utilization rate of magnetic flux is improved by more than 10%, the torque loss is reduced, the material utilization rate is improved, the running reliability of the permanent magnet motor is improved, the magnetic steel consumption is reduced, and the cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a stator and rotor air gap portion of a low-speed large-torque permanent magnet motor system magnetic isolation mechanism of the invention;
FIG. 2 is a schematic diagram of a pole piece spacing portion of a flux barrier mechanism of the low-speed large-torque permanent magnet motor system of the present invention shown in FIG. 1;
FIG. 3 is a partial schematic view of a rotor magnetic steel slot retaining magnetic steel structure of the magnetic isolation mechanism of the low-speed large-torque permanent magnet motor system shown in FIG. 2;
FIG. 4 is a cross-sectional view of the magnetic shield mechanism of the low-speed large-torque permanent magnet motor system of the present invention shown in FIG. 3;
illustration of the drawings: the magnetic-isolation-type rotor comprises a stator 1, a rotor punching sheet 2, an air gap 3, a pole shoe gap 4, a magnetic steel position control mechanism 5, magnetic steel 6, a magnetic steel 7, a magnetic isolation cylinder 8, a rotor shaft 9, a pole shoe 10, a magnetic isolation mechanism mounting shaft 11 and a dovetail groove.
Detailed Description
The invention is described in detail below with reference to the following figures and specific embodiments:
the specific embodiment is as follows:
in the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
The first embodiment is as follows:
the utility model provides a big moment of torsion permanent-magnet motor system of low-speed separates magnetic mechanism, including rotor and the stator 1 coaxial with the rotor, wherein the center of rotor is equipped with rotor shaft 8, rotor shaft 8's the outside is fixed with the magnetic separation mechanism installation axle 10 coaxial with rotor shaft 8, the outside of magnetic separation mechanism installation axle 10 is fixed with the magnetic separation barrel 7 of aluminum alloy material through interference fit, dovetail 11 is being equipartited to the outer face of cylinder of magnetism 7, be equipped with the rotor punching 2 group of 2 constitutions of rotor punching sheet that are made by a plurality of amorphous gold materials in every dovetail 11, form the magnet steel groove between the 2 groups of adjacent rotor punching sheet, install magnet steel 6 in the magnet steel groove, wherein magnet steel 6's fixed is fixed through rotor punching sheet 2 two radial lateral walls are equipped with magnet steel position control mechanism 5 respectively, in addition, stator 1 inboard is equipped with a plurality of pole shoes 9 that are close:
the air gap 3 between the pole shoe 9 and the rotor punching sheet 2 is 0.5 mm;
the pole shoe space 4 is 0.4 mm;
the distance between the limiting plane of the magnetic steel 6 of the magnetic steel position control mechanism 5 and the end part of the excircle of the rotor is 3 mm;
the magnetic steel position control mechanism 5 is a flange which is close to one side of the inner ring surface of the rotor punching sheet 2 and is provided with a limit plane.
Example two:
the utility model provides a big moment of torsion permanent-magnet motor system of low-speed separates magnetic mechanism, including rotor and the stator 1 coaxial with the rotor, wherein the center of rotor is equipped with rotor shaft 8, rotor shaft 8's the outside is fixed with the magnetic separation mechanism installation axle 10 coaxial with rotor shaft 8, the outside of magnetic separation mechanism installation axle 10 is fixed with the magnetic separation barrel 7 of aluminum alloy material through interference fit, dovetail 11 is being equipartited to the outer face of cylinder of magnetism 7, rotor punching 2 group of 2 groups of rotor punching of making by a plurality of silicon steel sheets is equipped with in every dovetail 11, form the magnet steel groove between the 2 groups of adjacent rotor punching, install magnet steel 6 in the magnet steel groove, wherein magnet steel 6's fixed is fixed through rotor punching 2 two radial lateral walls are equipped with magnet steel position control mechanism 5 respectively, in addition, stator 1 inboard is equipped with a plurality of pole shoes 9 that are close to each other, wherein:
an air gap 3 between the pole shoe 9 and the rotor punching sheet 2 is 1 mm;
the pole shoe space 4 is 0.2 mm;
the distance between the limiting plane of the magnetic steel 6 of the magnetic steel position control mechanism 5 and the end part of the excircle of the rotor is 6 mm;
the magnetic steel position control mechanism 5 is a flange which is close to one side of the inner ring surface of the rotor punching sheet 2 and is provided with a limit plane.
Example three:
the utility model provides a big moment of torsion permanent-magnet motor system of low-speed separates magnetic mechanism, including rotor and the stator 1 coaxial with the rotor, wherein the center of rotor is equipped with rotor shaft 8, rotor shaft 8's the outside is fixed with the magnetic separation mechanism installation axle 10 coaxial with rotor shaft 8, the outside of magnetic separation mechanism installation axle 10 is fixed with the magnetic separation barrel 7 of aluminum alloy material through interference fit, dovetail 11 is being equipartited to the outer face of cylinder of magnetism 7, rotor punching 2 group of 2 groups of rotor punching of making by a plurality of silicon steel sheets is equipped with in every dovetail 11, form the magnet steel groove between the 2 groups of adjacent rotor punching, install magnet steel 6 in the magnet steel groove, wherein magnet steel 6's fixed is fixed through rotor punching 2 two radial lateral walls are equipped with magnet steel position control mechanism 5 respectively, in addition, stator 1 inboard is equipped with a plurality of pole shoes 9 that are close to each other, wherein:
an air gap 3 between the pole shoe 9 and the rotor punching sheet 2 is 1.5 mm;
the pole shoe space 4 is 0.3 mm;
the distance between the limiting plane of the magnetic steel 6 of the magnetic steel position control mechanism 5 and the end part of the excircle of the rotor is 7 mm;
the magnetic steel position control mechanism 5 is a flange which is close to one side of the inner ring surface of the rotor punching sheet 2 and is provided with a limit plane.
The above examples illustrate the present invention in detail. It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and that various changes, modifications, additions, deletions, and substitutions which may be made by those skilled in the art within the spirit of the present invention are also within the scope of the present invention.
Claims (9)
1. The utility model provides a big moment of torsion permanent magnet motor system of low-speed separates magnetic mechanism, includes the rotor and with the coaxial stator of rotor, its characterized in that, the rotor includes separates magnetic mechanism and evenly fixes a plurality of annular rotor punching of discontiguous each other in separating the magnetic mechanism outside, rotor punching both radial lateral walls are equipped with magnet steel position control mechanism respectively, form the magnetic steel groove between the adjacent rotor punching, the stator inboard is equipped with a plurality of pole shoes that are close to each other, the air gap between pole shoe and the rotor punching is 0.1mm to 3 mm.
2. The low-speed large-torque permanent magnet motor system magnetic shielding mechanism of claim 1, wherein the magnetic steel position control mechanism is a flange which is close to one side of the inner ring surface of the rotor sheet and is provided with a limiting plane.
3. The system flux barrier mechanism of a low-speed high-torque permanent magnet motor according to claim 2, wherein the distance between the magnetic steel limiting plane of the magnetic steel position control mechanism and the end of the outer circle of the rotor is 1mm to 10 mm.
4. The system magnet isolating mechanism of a low-speed large-torque permanent magnet motor according to claim 3, wherein the distance between the magnetic steel position control mechanism and the end part of the outer circle of the rotor is 3mm to 8 mm.
5. The system magnetic isolation mechanism of the low-speed large-torque permanent magnet motor as claimed in any one of claims 1 to 4, wherein the magnetic isolation mechanism is a cylindrical magnetic isolation cylinder sleeved on the rotor shaft.
6. The low-speed high-torque permanent magnet motor system magnetic isolation mechanism is characterized in that dovetail grooves for fixing rotor sheets are uniformly formed in the outer cylindrical surface of the magnetic isolation cylinder, and dovetail protrusions are formed in the inner annular surface of each rotor sheet.
7. The low-speed high-torque permanent magnet motor system magnetic shielding mechanism according to claim 5, wherein the magnetic shielding cylinder is made of aluminum alloy.
8. The magnetic shielding mechanism of a low-speed large-torque permanent magnet motor system according to any one of claims 1 to 4, 6 and 7, wherein the pole shoes are of a fan-ring structure, and the distance between adjacent pole shoes is less than or equal to 0.5 mm.
9. The system flux-barrier mechanism of a low-speed high-torque permanent magnet motor according to claim 5, wherein said pole shoes are of a fan-ring structure, and the distance between adjacent pole shoes is less than or equal to 0.5 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911010488.5A CN110635597A (en) | 2019-10-23 | 2019-10-23 | Magnetic isolation mechanism of low-speed large-torque permanent magnet motor system |
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| CN201911010488.5A CN110635597A (en) | 2019-10-23 | 2019-10-23 | Magnetic isolation mechanism of low-speed large-torque permanent magnet motor system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987827A (en) * | 2020-08-20 | 2020-11-24 | 重庆赛力盟电机有限责任公司 | Low-speed load direct-drive permanent magnet motor |
-
2019
- 2019-10-23 CN CN201911010488.5A patent/CN110635597A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987827A (en) * | 2020-08-20 | 2020-11-24 | 重庆赛力盟电机有限责任公司 | Low-speed load direct-drive permanent magnet motor |
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