CN107222046A - Tangential motor and tangential rotor - Google Patents
Tangential motor and tangential rotor Download PDFInfo
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- CN107222046A CN107222046A CN201710676598.XA CN201710676598A CN107222046A CN 107222046 A CN107222046 A CN 107222046A CN 201710676598 A CN201710676598 A CN 201710676598A CN 107222046 A CN107222046 A CN 107222046A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000009966 trimming Methods 0.000 claims abstract description 16
- 230000007704 transition Effects 0.000 claims description 7
- 230000004907 flux Effects 0.000 abstract description 18
- 230000008859 change Effects 0.000 abstract description 6
- 230000010349 pulsation Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000750 progressive effect Effects 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
- H02K1/22—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]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
-
- 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)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a kind of tangential motor and tangential rotor, tangential motor includes tangential rotor and stator (4), the tangential rotor has the outer surface towards the stator (4), and the tooth boots of the stator (4) have the medial surface towards the tangential rotor；The outer surface has the trimming structure being correspondingly arranged with the magnet steel (2) in the tangential rotor；Or, the both sides of the medial surface have along the symmetrically arranged trimming structure of its center line.The tangential motor that the present invention is provided, can change the gas length of motor tangentially each position of internal circular surfaces, and then improve air-gap field, so that air gap flux density and counter potential waveform sine degree are improved, harmonic wave accounting is reduced, and then reduces torque pulsation, motor oscillating noise is effectively reduced.
Description
Technical Field
The invention relates to the technical field of motor equipment, in particular to a tangential motor and a tangential motor rotor.
Background
Because the tangential permanent magnet synchronous motor has the effect of gathering magnetism, compared with a radial permanent magnet synchronous motor, the tangential permanent magnet synchronous motor can generate higher air gap flux density, so that the motor has the advantages of small volume, light weight, large torque, high power density, high motor efficiency, good dynamic performance and the like, and is increasingly applied to the industrial fields of servo systems, electric traction and the like and the household appliance industry.
As shown in fig. 1, the tangential motor includes a tangential motor rotor and a stator 04, and the tangential motor rotor includes a rotating shaft 03, a rotor core 01, and a magnetic steel 02 disposed in the rotor core 01.
At present, the air gap flux density and the back electromotive force of the tangential permanent magnet synchronous motor contain various space harmonics, and the stator 04 of the tangential permanent magnet synchronous motor is provided with a slot, so that the magnetic conductance of a magnetic circuit is uneven, the air gap flux density and the back electromotive force contain various space harmonics, the harmonic ratio is large, and the various harmonics interact to generate low-order force waves to increase the vibration noise of the motor. The sine degree of the waveform is poor, the waveform distortion rate is high, so that the vibration and noise of the motor are large, the use health of a user is influenced, and the application and popularization of the motor are limited.
Therefore, how to reduce the vibration noise of the motor is a problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a tangential motor rotor to reduce vibration noise of the motor. The invention also provides a tangential motor.
In order to achieve the purpose, the invention provides the following technical scheme:
a tangential motor rotor has an outer surface facing a stator, the outer surface having a trimming structure disposed in correspondence with magnetic steel in the tangential motor rotor.
Preferably, in the tangential motor rotor, the trimming structure of the outer surface is an eccentric arc surface connected with the entire arc surface of the outer surface, and the eccentric arc surface is bent toward the inner side of the tangential motor rotor;
the eccentric cambered surface and the integral cambered surface are in smooth transition.
Preferably, in the tangential motor rotor, the closer to the magnetic pole boundary line of the magnetic steel, the greater the radian of the eccentric arc surface.
Preferably, in the tangential motor rotor, the radian of the eccentric arc surface is a, and the angle occupied by a single magnetic pole of the tangential motor rotor is F;
0.95≥A/F≥0.7。
preferably, in the tangential motor rotor, the number of pole pairs of the motor is P, the radian of the eccentric arc surface is a, an included angle between a connecting line of an eccentric arbitrary point and a connecting line of an eccentric connection point is θ 1, the connecting line of the eccentric arbitrary point is a connecting line between any point on the eccentric arc surface and the center of the surface-mounted motor rotor, the connecting line of the eccentric connection point is a connecting line between a connection point E and the center of the surface-mounted motor rotor, and the connection point E is a connection point between the intermediate arc surface and the eccentric arc surface; the distance between any point on the eccentric cambered surface and the center of the tangential motor rotor is an eccentric diameter R2, and the eccentric diameter R2 and the radius R1 of the whole cambered surface satisfy the following relation:wherein,
preferably, in the tangential motor rotor, the magnetic steel slot of the tangential motor rotor has an opening arranged toward the outer side of the tangential motor rotor, and the width L of the opening is smaller than the width M of the magnetic steel slot.
Preferably, in the tangential motor rotor, the openings are symmetrically arranged with respect to a center line of the magnetic steel slot.
Preferably, in the tangential motor rotor, the L/M is more than or equal to 0.6 and more than or equal to 0.5.
Preferably, in the tangential motor rotor, a theoretical thickness of the opening corresponding to a center line of the magnetic steel slot is U, and thicknesses of two sides of the opening are V;
1.2≥U/V≥1.1。
the invention also provides a tangential motor which comprises a tangential motor rotor and a stator, wherein the tangential motor rotor is the tangential motor rotor as described in any one of the above items.
Preferably, in the tangential motor, the tooth shoe of the stator has an inner side surface facing the rotor of the surface-mount motor, and both sides of the inner side surface have cut edge structures symmetrically arranged along a central line of the inner side surface.
Preferably, in the tangential motor, the edge cutting structure of the inner side surface is a curved cut surface disposed on both sides of a middle surface of the inner side surface, and the curved cut surface is curved toward the inner side of the stator.
Preferably, in the tangential motor, the radian of the curved tangent plane is G/2, and the angle occupied by a single tooth shoe of the stator is H;
0.7≥G/H≥0.4。
preferably, in the tangential motor, the number of slots on the stator is Q, and the radian of the curved section is G/2; an included angle between a connecting line of any point of a curve and a connecting line of a connecting point of the curve is set to be theta 2, the connecting line of any point of the curve is a connecting line of any point on the curve section and the circle center of the stator, the connecting line of the connecting point of the curve is a connecting line of a T connecting point and the circle center of the stator, and the T connecting point is a connecting point of the middle surface and the curve section; the distance between any point on the curve tangent plane and the center of the stator is a stator trimming diameter R4, and the stator trimming diameter R4 and the inner circle radius R3 of the stator satisfy the following relation:wherein,
according to the technical scheme, the outer surface of the tangential motor rotor provided by the invention is provided with the trimming structure which is arranged corresponding to the magnetic steel in the tangential motor rotor. Through setting up above-mentioned side cut structure, can change the air gap length of the round surface's in the tangential each position of motor, and then improve the air gap magnetic field for air gap magnetic density and back electromotive force wave form sine degree improve, have reduced the harmonic and have accounted for the ratio, and then have reduced torque pulsation, have effectively reduced motor vibration noise.
The invention also provides a tangential motor with the tangential motor rotor. Since the tangential motor rotor has the technical effects, the tangential motor with the tangential motor rotor also has the same technical effects, and the description is not repeated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a motor in the prior art;
fig. 2 is a schematic structural diagram of a first tangential motor according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a stator of a first tangential motor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a rotor of a first tangential motor according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a second tangential motor according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a rotor of a second tangential motor according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a third tangential motor according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a stator of a third tangential motor according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a third tangential motor rotor according to an embodiment of the present invention;
fig. 10 is a comparison graph of torque ripple of a tangential motor according to an embodiment of the present invention and a tangential motor according to the prior art.
Detailed Description
The invention discloses a tangential motor rotor, which aims to improve the heating effect and the heating efficiency. The invention also provides a motor with the tangential motor rotor.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 2-6, an embodiment of the present invention provides a tangential motor rotor, which has an outer surface facing a stator 4, and the outer surface has a trimming structure corresponding to a magnetic steel 2 in the tangential motor rotor.
The tangential motor rotor provided by the embodiment of the invention has the edge cutting structure on the outer surface, wherein the edge cutting structure is arranged corresponding to the magnetic steel 2 in the tangential motor rotor. Through setting up above-mentioned side cut structure, can change the air gap length of the round surface's in the tangential each position of motor, and then improve the air gap magnetic field for air gap magnetic density and back electromotive force wave form sine degree improve, have reduced the harmonic and have accounted for the ratio, and then have reduced torque pulsation, have effectively reduced motor vibration noise.
It can be understood that the trimming structure correspondingly arranged on the magnetic steel 2 is aligned with the magnetic steel 2 along the radial direction of the tangential motor rotor. The edge cutting structure is an edge structure formed by cutting off a part of the existing solid structure. The tangential motor rotor comprises a rotating shaft 3, a rotor iron core 1 and magnetic steel 2. The stator 4 is provided with stator slots 41, the stator slots 41 having openings 42 arranged towards the rotor of the tangential motor. The width of the opening 42 is K.
In the embodiment, the tangential motor rotor comprises a plurality of tangentially magnetized permanent magnets, and two adjacent permanent magnets are oppositely arranged with the same polarity.
Preferably, the trimming structure of the outer surface is an eccentric arc surface 12 connected with the whole arc surface 11 of the outer surface, and the eccentric arc surface 12 is bent towards the inner side of the tangential motor rotor; the eccentric arc surface 12 and the integral arc surface 11 are in smooth transition. In the present embodiment, the outer surface of the rotor core 1 of the tangential motor rotor is cut, and the structure of the stator 4 may be the same as that of the stator 4 in the related art. The eccentric arc surface 12 is an arc surface structure with a circle center not coincident with the circle center of the tangential motor rotor.
Of course, the edge cutting structure of the outer side face can be arranged in other structures, such as a plane and the like.
The closer the eccentric arc surface 12 is to the magnetic pole boundary line of the magnetic steel 2, the larger the radian of the eccentric arc surface 12 is. Wherein, the connection point of the eccentric arc surface and the whole arc surface 11 is point E, the eccentric arc surface 12 changes along a curve function from the point E to the direction of the boundary of the magnetic pole, and the eccentric arc surface 12 of the rotor core 1 extends along the circumferential direction. Through the arrangement, the air gap permeance of the magnetic circuit is more uniform.
Preferably, the arc of the eccentric arc surface 12 is a, and the angle occupied by a single magnetic pole of the tangential motor rotor is F. Through setting up eccentric cambered surface 12 for rotor core 1 is equipped with the side cut, and the rotor outer wall between two magnetic pole central lines of rotor comprises one section whole cambered surface 11, one section eccentric cambered surface 12 and one section whole cambered surface 11, and eccentric cambered surface 12 is located the intermediate position, and eccentric cambered surface 12 is produced after current complete arc surface (all are whole cambered surface 11) cuts. The radius of the whole arc surface 11 is set to be R1, the periphery of the rotor is trimmed through the arrangement of the eccentric arc surface 12, the radian of the eccentric arc surface 12 is smaller than that of the whole arc surface 11, the eccentric arc surface 12 is symmetrical about the center line of the magnetic steel groove, the eccentric arc surface 12 is a curved surface, the curve is in smooth transition, and the eccentric arc surface 12 changes from the E point to the center line direction of the permanent magnet groove along a curve function. The eccentric arc surface 12 extends along the circumferential direction, and the closer the eccentric arc surface 12 is to the center line of the magnetic pole. Simulation research shows that the ratio of the radian of the eccentric arc surface 12 to the radian of the whole arc surface 11 has great influence on the air gap flux density harmonic ratio. The eccentric cambered surface 12 is arranged on the rotor, the shape of the magnetic pole of the rotor is changed, and the magnetic pole is in a salient pole shape, so that the lengths of air gaps at all positions on the surface of the rotor are different. When A/F is larger than or equal to 0.7, the length of the air gaps on two sides of the magnetic pole is increased, the air gap flux guide on two sides of the magnetic pole and the air gap flux density on two sides of the magnetic pole are reduced, the change of the flux guide is more uniform, the waveform of the air gap flux density is closer to a sine wave, the air gap flux density and counter potential harmonic ratio are reduced, and the vibration noise is further reduced. However, when the a/F is greater than 0.95, the radian of the cut edges at two sides of the magnetic pole is too large, which results in that the length of each air gap on the surface of the rotor is increased, the magnetic conductance of each air gap on the surface of the rotor is reduced, the magnetic density of the air gap on the surface of the rotor is reduced, the waveform of the magnetic density of the air gap is not improved, the waveform distortion rate is still high, the vibration noise of the motor is still large, and meanwhile, the length of the air gap is too long, the flux linkage of the motor and the torque of the motor. Therefore, preferably, 0.95. gtoreq.A/F. gtoreq.0.7.
As shown in fig. 10, in this embodiment, the number of pole pairs of the motor is P, the radian of the eccentric arc surface 12 is a, the included angle between the eccentric arbitrary point connecting line and the eccentric connecting point connecting line is θ 1, the eccentric arbitrary point connecting line is a connecting line between an arbitrary point on the eccentric arc surface and the center of the surface-mounted motor rotor, the eccentric connecting point connecting line is a connecting line between the E connecting point and the center of the surface-mounted motor rotor, and the E connecting point is a connecting point between the intermediate arc surface and the eccentric arc surface. That is, A/2 > θ 1 >0 degree, the eccentric cambered surface 12 gradually increases in the process of changing along the curve theta 1 until the point E changes to the central line of the magnetic steel. The distance between any point on the eccentric arc surface 12 and the center of the tangential motor rotor is the eccentric diameter R2. It will be appreciated that the eccentric diameter R2 tapers as it changes from point E along the curve. The eccentric diameter R2 and the radius R1 of the cambered surface 11 satisfy the following relation:wherein,through the arrangement, the mutability of the length of the air gap can be effectively reduced, the air gap magnetic conductance of a magnetic circuit is more uniform, the sine degree of the air gap flux density waveform on the surface of the rotor is improved, the harmonic ratio and the torque ripple are reduced, the vibration noise and the harmonic loss of the motor are reduced, and the efficiency of the motor is improved.
As shown in fig. 5 and 6, in the second embodiment, the magnetic steel slots of the tangential motor rotor have openings 13 disposed toward the outer side of the tangential motor rotor, and the width L of the openings is smaller than the width M of the magnetic steel slots. Through the arrangement, the magnetic steel 2 is not easy to fly out of the magnetic steel groove when running at high speed, and the mechanical strength of the rotor structure is ensured.
Preferably, the opening side of the opening 13 is a plane.
Further, the openings 13 are symmetrically arranged with respect to the center line of the magnetic steel slot. Through the arrangement, the two sides of the opening are provided with solid parts for preventing the magnetic steel 2 from flying out of the magnetic steel groove.
Preferably, 0.6. gtoreq.L/M.gtoreq.0.5. In the range, the opening 13 increases the length of the air gap at the position on the surface of the rotor, so that the air gap magnetic conductance transition of a magnetic circuit of the motor is more uniform, the sine degree of the air gap magnetic density waveform is improved, the harmonic ratio, the torque pulsation, the vibration noise and the harmonic loss are reduced, and the efficiency of the motor is improved.
In this embodiment, since the bottom surface of the opening 13 of the rotor permanent magnet slot is flat and symmetrical about the center line of the permanent magnet slot, the opening-type center line is thick and both sides are thin. The theoretical thickness of the opening 13 corresponding to the center line of the magnetic steel slot is set as U, that is, when the opening 13 is not provided, the distance from the eccentric arc surface 12 corresponding to the center line of the magnetic steel slot to the bottom surface of the opening 13 is set as the theoretical thickness U, and the thickness of the two sides of the opening 13 is set as V; at this time, U/V is 1.2. gtoreq.1.1. Through the arrangement, the air gap length is increased, and meanwhile, the sudden change of the air gap length is reduced, so that the uniformity of air gap magnetic conductance transition of a motor magnetic circuit is improved, the air gap magnetic density waveform sine degree is improved, and the harmonic ratio and the vibration noise are reduced.
It can be understood that, at the position where neither the stator 4 nor the magnetic steel 2 is trimmed, the air gap is the smallest, and the length of the air gap is D, and moving clockwise or counterclockwise along the surface of the magnetic steel 2 of the rotor from the position where the air gap is the smallest, the length of the air gap gradually increases.
The embodiment of the invention also provides a tangential motor with the tangential motor rotor. The tangential motor provided by the embodiment of the invention has the same technical effects as the tangential motor rotor, and the technical effects are not described in detail herein.
Preferably, in the tangential motor rotor provided by the embodiment of the invention, the tooth shoe of the stator has an inner side surface facing the surface-mounted motor rotor, and both sides of the inner side surface are provided with trimming structures symmetrically arranged along the central line of the inner side surface.
According to the stator provided by the embodiment of the invention, the cutting edge structures symmetrically arranged along the central line of the stator are arranged on the two sides of the inner side surface, so that the length of the air gap of the motor at each position along the inner circle surface of the stator 1 can be changed, the air gap magnetic field is further improved, the air gap magnetic density and the counter electromotive force waveform sine degree are improved, the harmonic ratio is reduced, the torque pulsation is further reduced, and the vibration noise of the motor is effectively reduced.
It will be appreciated that the trim structure is an edge structure from which a portion of an existing solid structure has been cut.
Preferably, the cutting edge structure of the inner side surface is a curved cut surface 43 disposed at both sides of the middle surface of the inner side surface, and the curved cut surface 43 is curved toward the inner side of the stator. In this embodiment, the inner surface of the tooth shoe of the stator 4 is cut away, and the structure of the rotor may be the same as that of the prior art.
Of course, the edge cutting structure of the inner side face can be arranged in other structures, such as a plane and the like.
Wherein, the radian of the curve section 43 is G/2, and the angle occupied by a single tooth shoe of the stator is H; as shown in fig. 8, the connection point of the middle plane and the curved section 43 is a point T, and the cutting position (curved section 43) of the tooth shoe of the stator 4 is close to the portion of the air gap between the stator and the rotor. Simulation research shows that the ratio of the radian occupied by the curve section 43 (the cutting position of the tooth shoe of the stator 4) to the angle occupied by a single tooth shoe is H, so that the air gap flux density harmonic has a large influence. When G/H is larger than or equal to 0.4, the radian of the curve section 43 is larger, so that the air gap length transition of the inner surface of the stator 4 is more uniform, the uniformity of the magnetic conductance of the air gap of the magnetic circuit is improved, the air gap flux density and counter potential waveform are improved, the harmonic ratio is reduced, and the vibration noise of the motor is reduced. However, when G/H is greater than 0.7, the arc angle of the curve section 43 is too large, and the magnetic flux is excessively concentrated at the center line of the tooth shoe of the stator 4, so that the air gap flux density at the position is too high, the air gap flux density waveform is seriously distorted, the harmonic ratio is increased, and the vibration noise of the motor is increased. Therefore, preferably, 0.7. gtoreq.G/H. gtoreq.0.4.
Further, in this embodiment, the number of slots on the stator is Q, the radian of the curve section 43 is G/2, the included angle between the connecting line of any point of the curve and the connecting line of the connecting point of the curve is θ 2, and the connecting line of any point of the curve is the connecting line between any point of the curve section and the center of the circle of the stator 4; the connecting line of the curve connecting points is a connecting line of the T connecting point and the circle center of the stator 1, the T connecting point is a connecting point of the middle surface and the curve tangent plane, namely G/2 is larger than theta 2 and larger than 0 degree, wherein the stator 4 is concentric with the rotor, the theta 2 is gradually increased in the process that the trimming edge of the stator 4 changes along the curve, and the curve tangent plane 43 changes along the curve from the point T until the curve coincides with the edge line of the tooth shoe of the stator 4. The distance between any point on the curved tangent plane 43 and the center of the stator 4 is the cutting edge diameter R4 of the stator 4. I.e. the course of the cutting edge R4 of the stator 4 changing from point T along a curveThe cutting edge diameter R4 of the stator 4 and the inner circle radius (namely the radius of the middle surface) R3 of the stator 4 satisfy the following relationship:whereinThe change of the air gap magnetic conductance of the motor is more uniform, the sine degree of the air gap magnetic flux density waveform is improved, the harmonic wave occupation ratio and the torque ripple are reduced, the vibration noise and the harmonic wave loss of the motor are also reduced, and the motor efficiency is improved.
Wherein Q is more than or equal to 4. In this embodiment, Q is 12.
It can be understood that, at the position where neither the stator 4 nor the magnetic steel 2 is trimmed, the air gap is the smallest, and the length of the air gap is D, and moving clockwise or counterclockwise along the surface of the magnetic steel 2 of the rotor from the position where the air gap is the smallest, the length of the air gap gradually increases.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. The tangential motor rotor is characterized in that the tangential motor rotor is provided with an outer surface facing the stator (4), and the outer surface is provided with a trimming structure correspondingly arranged with magnetic steel (2) in the tangential motor rotor.
2. -tangential electric machine rotor according to claim 1, characterised in that the trimming structure of the outer surface is an eccentric arc surface (12) connected to the full arc surface (11) of the outer surface, the eccentric arc surface (12) being curved towards the inside of the tangential electric machine rotor;
the eccentric arc surface (12) and the integral arc surface (11) are in smooth transition.
3. A tangential motor rotor as claimed in claim 2, characterised in that the curvature of the eccentric curved surface (12) is greater the closer it is to the polar boundary of the magnetic steel (2).
4. The tangential motor rotor as claimed in claim 2, characterized in that the arc of said eccentric arc surface (12) is a, the angle occupied by a single magnetic pole of said tangential motor rotor is F;
0.95≥A/F≥0.7。
5. the tangential motor rotor as claimed in claim 2, wherein the number of pole pairs of the motor is P, the radian of the eccentric arc surface (12) is a, the included angle between the connecting line of any eccentric point and the connecting line of the eccentric connecting point is θ 1, the connecting line of any eccentric point is the connecting line of any point on the eccentric arc surface and the center of the surface-mounted motor rotor, the connecting line of the eccentric connecting point is the connecting line of the connecting point E and the center of the surface-mounted motor rotor, and the connecting point E is the connecting point of the intermediate arc surface and the eccentric arc surface; the distance between any point on the eccentric cambered surface (12) and the center of the tangential motor rotor is an eccentric diameter R2, and the radius R1 of the eccentric diameter R2 and the whole cambered surface (11) meets the following relation:wherein
6. A tangential motor rotor as claimed in claim 2, characterised in that the magnetic steel slots of the tangential motor rotor have an opening (13) arranged towards the outside of the tangential motor rotor, the width L of said opening being smaller than the width M of the magnetic steel slots.
7. A tangential motor rotor as claimed in claim 6, characterised in that said openings (13) are arranged symmetrically with respect to the centre line of the magnetic steel slot.
8. A tangential motor rotor as claimed in claim 6 or 7, characterized in that 0.6. gtoreq.L/M.gtoreq.0.5.
9. The tangential electric machine rotor according to claim 6, characterised in that the theoretical thickness of the opening (13) corresponding to the centre line of the magnetic steel slot is set as U, and the thickness of the two sides of the opening (13) is set as V;
1.2≥U/V≥1.1。
10. a tangential electric machine comprising a tangential electric machine rotor and a stator, characterized in that the tangential electric machine rotor is a tangential electric machine rotor according to any of claims 1-9.
11. The tangential motor of claim 10, wherein the tooth shoes of the stator have an inner side facing the rotor of the surface-mounted motor, and both sides of the inner side have cut-edge structures symmetrically disposed along a center line thereof.
12. The tangential motor according to claim 11, wherein said cut edge structure of said inner side surface is a curved cut surface (43) provided on both sides of a middle surface of said inner side surface, said curved cut surface (43) being curved toward an inner side of said stator.
13. The tangential electric machine according to claim 11, wherein the curvature of said curved section (43) is G/2, the angle occupied by the single tooth shoes of said stator being H;
0.7≥G/H≥0.4。
14. a tangential electric machine as claimed in any one of claims 11 to 13, characterized in that the number of slots on the stator is Q, the curvature of the curved section (43) is G/2; an included angle between a connecting line of any point of a curve and a connecting line of connecting points of the curve is set to be theta 2, the connecting line of any point of the curve is a connecting line of any point on a section of the curve and the circle center of the stator (1), the connecting line of the connecting points of the curve is a connecting line of a T connecting point and the circle center of the stator (1), and the T connecting point is a connecting point of the middle surface and the section of the curve; the distance between any point on the curve tangent plane (43) and the center of the stator is a stator trimming diameter R4, and the stator trimming diameter R4 and the inner circle radius R3 of the stator satisfy the following relation:wherein
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| WO2019114396A1 (en) * | 2017-12-11 | 2019-06-20 | 珠海格力节能环保制冷技术研究中心有限公司 | Motor rotor and motor |
| CN112421924A (en) * | 2020-11-09 | 2021-02-26 | 广东威灵电机制造有限公司 | Motor and household appliance |
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| CN107222046B (en) | 2023-07-07 |
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