CN107276353B - Tangential motor, tangential motor rotor and rotor core thereof - Google Patents
Tangential motor, tangential motor rotor and rotor core thereof Download PDFInfo
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- CN107276353B CN107276353B CN201710675596.9A CN201710675596A CN107276353B CN 107276353 B CN107276353 B CN 107276353B CN 201710675596 A CN201710675596 A CN 201710675596A CN 107276353 B CN107276353 B CN 107276353B
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- 230000005389 magnetism Effects 0.000 claims abstract description 42
- 239000007787 solid Substances 0.000 claims abstract description 9
- 238000004080 punching Methods 0.000 claims abstract description 5
- 238000002955 isolation Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims 2
- 239000011162 core material Substances 0.000 description 41
- 230000004907 flux Effects 0.000 description 36
- 230000000694 effects Effects 0.000 description 7
- 230000010349 pulsation Effects 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement 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
- 230000003014 reinforcing 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
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
- H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a tangential motor, a tangential motor rotor and a rotor core thereof, wherein the rotor core comprises a rotor body (1) and permanent magnet grooves (2) arranged on the rotor body (1), a fixing hole (11) for fixing a rotor punching sheet, 2N magnetism isolating holes (12) and 2M auxiliary holes (13) are arranged on a rotor magnetic pole between two adjacent permanent magnet grooves (2), the 2N magnetism isolating holes (12) and the 2M auxiliary holes (13) are symmetrically arranged on two sides of a magnetic pole central line of a rotor magnetic pole, the magnetism isolating holes (12) are positioned on the outer side of the fixing hole (11), and the auxiliary holes (13) are communicated with the permanent magnet grooves (2); the widths of the magnetism isolating hole (12) and the auxiliary hole (13) are increased along the direction from the center of the circle of the rotor body (1) to the outer side of the rotor body; the width of the solid part of the magnetic pole between the two magnetism isolating holes (12) near the center line of the magnetic pole increases along the outer side of the rotor body (1) towards the center direction of the rotor body. The rotor core reduces motor vibration noise.
Description
Technical Field
The invention relates to the technical field of motor equipment, in particular to a tangential motor, a tangential motor rotor and a rotor core thereof.
Background
Because the tangential permanent magnet synchronous motor has the effect of 'magnetism gathering', compared with the radial permanent magnet synchronous motor, the tangential permanent magnet synchronous motor can generate higher air gap magnetic density, so that the motor has the advantages of small volume, light weight, large torque, large 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.
At present, the air gap flux density and the counter potential of the tangential permanent magnet synchronous motor contain various space harmonics, and the stator of the tangential permanent magnet synchronous motor is provided with grooves, so that the magnetic path flux guide is uneven, the air gap flux density and the counter potential contain various space harmonics, the ratio of the harmonics is large, and various harmonics interact to generate low-order force waves, so that the vibration noise of the motor is increased. The waveform sine degree 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 affected, 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 by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides a rotor core to reduce vibration noise of a motor. The invention also provides a tangential motor rotor with the rotor core and a tangential motor.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the rotor iron core comprises a rotor body and permanent magnet grooves arranged on the rotor body, wherein a fixing hole for fixing a rotor punching sheet, 2N magnetism isolating holes and 2M auxiliary holes are formed in a rotor magnetic pole between two adjacent permanent magnet grooves, the 2N magnetism isolating holes and the 2M auxiliary holes are symmetrically arranged on two sides of a magnetic pole central line of the rotor magnetic pole respectively, the magnetism isolating holes are positioned on the outer sides of the fixing holes, and the auxiliary holes are communicated with the permanent magnet grooves;
the width of the magnetism isolating hole and the auxiliary hole is increased along the direction from the center of the circle of the rotor body to the outer side of the rotor body; and the width of the solid part of the magnetic pole between the two magnetic isolation holes near the center line of the magnetic pole increases along the outer side of the rotor body towards the center direction of the rotor body.
Preferably, in the rotor core, a first magnetic isolation bridge is formed between an outer side hole surface of the auxiliary hole, which is close to the outer side of the rotor body, and the outer wall of the rotor body, wherein the width of the first magnetic isolation bridge is a, and the length of an air gap of the rotor core, which is matched with a stator, is D;
1.6≥A/D≥1.1。
preferably, in the rotor core, the auxiliary hole has a length J, and the permanent magnet slot has a magnetic steel length G;
0.35≥J/G≥0.1。
preferably, in the rotor core, a width of an outer hole surface of the auxiliary hole facing the outer side of the rotor body is K, and an air gap length of the rotor core for matching with the stator is D;
5≥K/D≥1.5。
preferably, in the rotor core, one end of the auxiliary hole facing the center of the rotor body is communicated with the permanent magnet slot;
and a second magnetism isolating bridge is arranged between the side wall of the auxiliary hole facing the permanent magnet groove and the permanent magnet groove.
Preferably, in the rotor core, the width of the communication part between the auxiliary hole and the permanent magnet slot is P, and the length of an air gap between the rotor core and the stator is D;
2≥P/D≥0.5。
preferably, in the rotor core, the width of the second magnetic shielding bridge increases in a direction from the center of the rotor body to the outside thereof.
Preferably, in the rotor core, a distance between two end points of the second magnetic isolation bridge, which are close to the outer side of the rotor body, is T, and an air gap length of the rotor core for being matched with a stator is D;
4.5≥T/D≥2.5。
preferably, in the rotor core, the number of pairs of magnetic poles of the motor is P, the width of an outer hole surface of the auxiliary hole facing the outer side of the rotor body is H, the maximum included angle between the auxiliary hole and the central line of the permanent magnet slot communicated with the auxiliary hole is θ2, the permanent magnet slot is provided with an opening facing the outer side of the rotor body, the width of the opening is L, the opening is symmetrically arranged relative to the central line of the permanent magnet slot, and the included angle between one side edge of the opening and the central line of the permanent magnet slot is θ1;
the invention also provides a tangential motor rotor, which comprises a rotor core and tangential magnetization permanent magnets arranged in the permanent magnet slots of the rotor core, wherein the rotor core is the rotor core according to any one of the above.
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.
According to the technical scheme, the widths of the magnetic isolation holes of the rotor core are increased along the direction from the center of the rotor body to the outer side of the rotor core, and the widths of the solid magnetic pole parts between the two magnetic isolation holes close to the center line of the magnetic pole are increased along the direction from the outer side of the rotor body to the center of the rotor core, so that the solid magnetic pole parts between the two magnetic isolation holes are widened from the outer side of the rotor body to the direction of the fixing holes, the positions of the fixing holes are effectively ensured to avoid the magnetic isolation holes, and the mechanical strength of the rotor core after the fixing holes and the magnetic isolation holes are formed on the rotor magnetic pole of the rotor body is ensured; and, because the magnetism isolating hole and the auxiliary hole are filled with air, the magnetic permeability of the air is smaller than that of the rotor core material (the solid part of the rotor body). The magnetic flux trend in the rotor magnetic pole can be changed by arranging the magnetism isolating holes and the auxiliary holes, the auxiliary holes are communicated with the permanent magnet grooves, the arrangement of the fixing holes, the magnetism isolating holes and the auxiliary holes is facilitated, the trend of the magnetic flux is further limited by the positions and the shapes of the auxiliary holes, the distribution of an air gap magnetic field is improved, the waveform sine degree of the air gap magnetic density is better, the harmonic duty ratio of the air gap magnetic density and counter potential is reduced, and the vibration noise of the motor is effectively reduced.
The invention also provides a motor with the tangential motor rotor. Since the tangential motor rotor has the above technical effects, the motor having the tangential motor rotor and the motor should have the same technical effects, and will not be described in detail herein.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a tangential motor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a tangential motor rotor according to an embodiment of the present invention;
fig. 3 is a schematic view of a second structure of a tangential motor rotor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a stator according to an embodiment of the present invention;
FIG. 5 is a graph of torque ripple coefficient versus A/D for a tangential motor according to an embodiment of the present invention;
FIG. 6 is a graph of the counter-potential harmonic duty cycle and the relationship between the no-load flux linkage and J/G of the tangential motor according to the embodiment of the invention;
fig. 7 is a torque ripple comparison chart 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 rotor core for reducing vibration noise of a motor. The invention also provides a tangential motor rotor with the rotor core and a tangential motor.
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.
Referring to fig. 1, an embodiment of the present invention provides a rotor core, which includes a rotor body 1 and permanent magnet slots 2 disposed on the rotor body 1, wherein a fixing hole 11, 2N magnetic isolation holes 12, 2M auxiliary holes 13,2N magnetic isolation holes 12 and 2M auxiliary holes 13 for fixing a rotor punching are disposed on a rotor magnetic pole between two adjacent permanent magnet slots 2, and are symmetrically disposed on two sides of a magnetic pole center line of the rotor magnetic pole respectively. That is, 2N magnetic isolation holes 12 are symmetrically disposed on both sides of the magnetic pole center line of the rotor magnetic pole, and 2M auxiliary holes 13 are symmetrically disposed on both sides of the magnetic pole center line of the rotor magnetic pole. The magnetism isolating hole 12 is positioned at the outer side of the fixed hole 11, and the auxiliary hole 13 is communicated with the permanent magnet groove 2; the widths of the magnetism isolating hole 12 and the auxiliary hole 13 increase in the direction of the outside of the rotor body 1 along the center of the circle. And, the width of the solid part of the magnetic pole between the two magnetism isolating holes 12 near the center line of the magnetic pole increases along the outside of the rotor body 1 toward the center direction thereof.
According to the rotor core provided by the embodiment of the invention, the width of the magnetism isolating holes 12 is increased along the direction from the center of the rotor body 1 to the outer side of the rotor body, and the width of the magnetic pole entity part between the two magnetism isolating holes 12 close to the center line of the magnetic pole is increased along the direction from the outer side of the rotor body 1 to the center of the rotor body, so that the magnetic pole entity part between the two magnetism isolating holes 12 is widened from the outer side of the rotor body 1 to the direction of the fixed hole 11, the position of the fixed hole 11 is effectively ensured to avoid the magnetism isolating holes 12, and the mechanical strength of the rotor magnetic pole of the rotor body 1 after the fixed hole 11 and the magnetism isolating holes 12 are formed is ensured; in addition, since the inside of the magnetism isolating hole 12 and the auxiliary hole 13 is air, the magnetic permeability of the air is smaller than that of the rotor core material (solid portion of the rotor body 1). Through seting up magnetism isolating hole 12 and auxiliary hole 13, can change the magnetic flux trend in the rotor magnetic pole, auxiliary hole 13 and permanent magnet groove 2 intercommunication have made things convenient for the arrangement of fixed hole 11, magnetism isolating hole 12 and auxiliary hole 13 to, position and shape that auxiliary hole 13 was setted up further restrict the trend of magnetic flux, and then improve the distribution of air gap magnetic field, make the wave form sine degree of air gap magnetic density better, reduce the harmonic duty ratio of air gap magnetic density, back electromotive force, effectively reduced the vibration noise of motor.
It will be appreciated that the width of the solid portion of the magnetic pole between the two magnetically isolated holes 12 is the distance between its two sides in a direction perpendicular to the radial direction of the rotor body 1. The width of the magnetism isolating hole 12 is the distance between the wall of the hole at both ends thereof in the direction perpendicular to the radial direction of the rotor body 1. Wherein, the fixing hole 11 is provided therein with a fixing member. When the fixing hole 11 is a rivet hole, the fixing piece is a rivet; when the fixing hole 11 is a screw hole, a structural reinforcing rod for connecting the rotor punching sheet is inserted into the screw hole. The fixing holes 11 may also be provided as other types of holes, such as screw holes, prismatic holes, elliptical holes, or the like.
Further, a first magnetism isolating bridge is formed between the outer side hole surface of the auxiliary hole 13, which is close to the outer side of the rotor body 1, and the outer wall of the rotor body 1, the width of the first magnetism isolating bridge is A, and the length of an air gap of the rotor core, which is matched with the stator, is D. Simulation studies show that the existence and thickness of the auxiliary holes 13 have a large influence on counter potential harmonics. If there is no first magnetism isolating bridge, that is, the auxiliary hole 13 penetrates through the outer side wall of the rotor body 1 and contacts with the air gap, so that the length of the air gap at the position is lengthened, the flux guide of the air gap is reduced, the distribution of the magnetic field of the air gap is uneven, the waveform of the magnetic density of the air gap is distorted, the magnetic density of the air gap and the counter potential harmonic wave ratio are increased, and the vibration noise of the motor is increased. When the first magnetic isolation bridge is arranged, the first magnetic isolation bridge is close to the outer side of the rotor body 1 and close to the air gap, so that the air gap magnetic field distribution can be effectively improved. As shown in FIG. 5, when A/D is more than or equal to 1, a small part of magnetic flux is allowed to be transmitted through the first magnetism isolating bridge, so that the trend of magnetic flux in magnetic poles is better improved, the distribution of an air gap field of the motor is improved, the harmonic wave duty ratio is reduced, the torque pulsation is reduced, and the vibration noise of the motor is reduced. However, when the A/D is more than 1.6, the width of the first magnetic isolation bridge is too large, most magnetic flux can still be transmitted to the air gap through the first magnetic isolation bridge, the influence on the improvement of the air gap magnetic field distribution is small, the harmonic ratio is still large, and the vibration noise of the motor is not reduced. Thus, preferably, 1.6. Gtoreq.A/D. Gtoreq.1.
Further, the length of the auxiliary hole 13 is J, and the length of the magnetic steel of the permanent magnet slot 2 is G. It has been found that the auxiliary holes 13 extend in the radial direction of the rotor, and that the longer the length J of the auxiliary holes 13, the greater the influence on the magnetic flux transmission path of the permanent magnets, since the auxiliary holes 13 are close to the permanent magnet slots 2. As shown in FIG. 6, when J/G is more than or equal to 0.1, air is arranged in the auxiliary hole 13, and the magnetic flux is small, so that the magnetic flux of the permanent magnet, which is close to the outer circle direction of the rotor, is transmitted along the middle part of the magnetic pole, and through the arrangement, the trend of the magnetic flux in the rotor can be better limited, the distribution of an air gap magnetic field is optimized, and the harmonic wave duty ratio and the torque pulsation are reduced, so that the vibration noise of the motor is reduced. However, when J/G > 0.35, the length J of the auxiliary hole 13 is too long, the auxiliary hole 13 blocks too much magnetic flux of the permanent magnet, the flux linkage of the motor is reduced, the output of the motor is reduced, and the motor efficiency is reduced. Thus, 0.35.gtoreq.J/G.gtoreq.0.1.
The length J of the auxiliary hole 13 is the distance between the nearest point of the auxiliary hole 13 from the outer side of the rotor body 1 and the nearest point of the auxiliary hole 13 from the center of the rotor body 1.
Preferably, the width of the outer hole surface of the auxiliary hole 13 facing the outer side of the rotor body 1 is K, and the air gap length of the rotor core for matching with the stator is D. Through simulation researches, the width K of the auxiliary hole 13 has a larger influence on motor vibration, and because the width K of the auxiliary hole 13 can change the air-gap magnetic field distribution along the circumferential direction of the outer surface of the rotor body 1, when K/D is more than or equal to 1.5, the air is in the auxiliary hole 13, so that the magnetic flux is small, less magnetic flux is transmitted along the auxiliary hole 13, and the number of the magnetic flux transmitted along the iron core part between the auxiliary hole 13 and the magnetism isolating hole 12 is increased, so that the trend of the magnetic flux of a magnetic circuit is improved, the air-gap magnetic field distribution is improved, and the torque pulsation and the motor vibration noise are reduced. However, when K/D > 5, the core portion between the auxiliary hole 13 and the magnetism isolating hole 12 is too small, and the magnetic flux is concentrated at this position, so that the air gap density at this position is increased, the torque pulsation is increased, and the motor vibration noise is increased. Thus, preferably, 5.gtoreq.K/D.gtoreq.1.5.
Preferably, the outer side of the auxiliary hole 13 extends in the rotor circumferential direction, and the width of the outer side of the auxiliary hole 13 is wider as the outer side of the auxiliary hole 13 extends toward the magnetic pole center line in the rotor circumferential direction closer to the magnetic pole center line.
Preferably, one end of the auxiliary hole 13 facing the center of the rotor body 1 is communicated with the permanent magnet slot 2; the side wall of the auxiliary hole 13 facing the permanent magnet slot 2 and the permanent magnet slot 2 are provided with a second magnetism isolating bridge. Through the arrangement, air is arranged in the auxiliary hole 13, and the magnetic flux is small, so that the magnetic flux on the second magnetism isolating bridge is small, the air gap flux uniformity of the magnetic circuit is further optimized, the air gap magnetic field distribution is further optimized, the air gap flux density, the counter-potential harmonic wave occupation ratio and the harmonic loss are reduced, the vibration noise is reduced, and the motor efficiency is improved.
In the present embodiment, the auxiliary hole 13 is thick at the outside and thin at the inside, that is, the auxiliary hole 13 has a larger outer width than inner width in the circumferential direction of the rotor body 1.
In this embodiment, the width of the communication part between the auxiliary hole 13 and the permanent magnet slot 2 is P, and the length of the air gap between the rotor core and the stator is D. Through researches, the auxiliary holes 13 are communicated with the permanent magnet grooves 2, so that the magnetic flux transmitted by the permanent magnets through the communication parts is reduced, and when the P/D is more than or equal to 0.5, the magnetic flux paths in the magnetic poles of the rotor are changed, so that the air gap magnetic field distribution is improved, and the harmonic wave duty ratio and the motor vibration noise are reduced. However, when P/D > 2, the width P of the portion where the auxiliary hole 13 communicates with the permanent magnet slot 2 is excessively large, the reluctance of the communicating portion increases, the utilization of the magnetic flux of the permanent magnet is restricted, the utilization rate of the permanent magnet decreases, and the flux linkage of the motor decreases, thereby causing the motor efficiency to decrease. Thus, preferably, 2. Gtoreq.P/D. Gtoreq.0.5.
The width of the second magnetism isolating bridge increases along the center of the rotor body 1 toward the outside thereof. Further reducing the vibration noise of the motor.
Preferably, the distance between two end points of the second magnetism isolating bridge, which are close to the outer side of the rotor body 1, is T, and the length of an air gap of the rotor core for being matched with the stator is D;4.5 The T/D is more than or equal to 2.5. Through the arrangement, part of magnetic flux of the permanent magnet is transmitted through the second magnetism isolating bridge, so that air gap magnetic field distribution is further improved, counter potential harmonic duty ratio is reduced, and motor vibration noise is reduced.
As shown in fig. 7, in the present embodiment, the pole pair number of the motor is P, the width of the outer hole surface of the auxiliary hole 13 facing the outer side of the rotor body 1 is H, the maximum included angle between the auxiliary hole 13 and the center line of the permanent magnet slot 2 communicated with the auxiliary hole is θ2, the permanent magnet slot 2 has an opening facing the outer side of the rotor body 1, the width of the opening is L, the opening is symmetrically arranged with respect to the center line of the permanent magnet slot 2, and the included angle between one side edge of the opening and the center line of the permanent magnet slot 2 is θ1. Simulation researches show that the width H of the auxiliary hole 13 and the width L of the opening of the permanent magnet slot 2 have a large influence on the counter potential harmonic ratio. The permanent magnet slots 2 open toward the air gap, increasing the air gap length there, and the auxiliary holes 13 extend in the circumferential direction of the rotor whenWhen the rotor is in use, the air gap flux guide in the circumferential direction of the rotor is enabled to be in uniform transition, so that the uniformity of the air gap flux guide of the magnetic circuit is improved, the magnetic flux transmission of the motor is in uniform transition, the waveform sine degree of the air gap flux density is improved, and the rotation of the motor is reducedMoment pulsation and motor vibration noise effectively improve motor efficiency. Therefore, preferably, a->
The embodiment of the invention also provides a tangential motor rotor, which comprises a rotor core and tangential magnetization permanent magnets arranged in the permanent magnet grooves of the rotor core, wherein the rotor core is any one of the rotor cores. Since the rotor core has the above technical effects, the tangential motor rotor having the rotor core should have the same technical effects, and will not be described in detail herein.
The embodiment of the invention also provides a tangential motor, which comprises a tangential motor rotor and a stator, and is characterized in that the tangential motor rotor is the tangential motor rotor. Since the above-mentioned tangential motor rotor has the above-mentioned technical effects, the tangential motor having the above-mentioned tangential motor rotor should have the same technical effects, and will not be described in detail herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer 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 (9)
1. The rotor core comprises a rotor body (1) and permanent magnet grooves (2) arranged on the rotor body (1), and is characterized in that a fixing hole (11), 2N magnetism isolating holes (12) and 2M auxiliary holes (13) for fixing rotor punching sheets are formed in a rotor magnetic pole between two adjacent permanent magnet grooves (2), 2N magnetism isolating holes (12) and 2M auxiliary holes (13) are symmetrically arranged on two sides of a magnetic pole central line of the rotor magnetic pole respectively, the magnetism isolating holes (12) are positioned on the outer side of the fixing hole (11), and the auxiliary holes (13) are communicated with the permanent magnet grooves (2); n and M are integers greater than 1;
the width of the magnetism isolating hole (12) and the auxiliary hole (13) are increased along the direction from the center of the circle of the rotor body (1) to the outer side of the center of the circle; the width of the solid part of the magnetic pole between the two magnetic isolation holes (12) close to the central line of the magnetic pole increases along the outer side of the rotor body (1) towards the center direction of the circle;
one end of the auxiliary hole (13) facing the center of the rotor body (1) is communicated with the permanent magnet groove (2); a second magnetism isolating bridge is arranged between the side wall, facing the permanent magnet groove (2), of the auxiliary hole (13) and the permanent magnet groove (2);
the number of the magnetic pole pairs of the motor is P, the width of an outer hole surface of the auxiliary hole (13) facing the outer side of the rotor body (1) is H, the maximum included angle between the auxiliary hole (13) and the central line of the permanent magnet groove (2) communicated with the auxiliary hole is theta 2, the permanent magnet groove (2) is provided with an opening facing the outer side of the rotor body (1), the width of the opening is L, the opening is symmetrically arranged relative to the central line of the permanent magnet groove (2), and the included angle between one side edge of the opening and the central line of the permanent magnet groove (2) is theta 1;
2. a rotor core according to claim 1, characterized in that the auxiliary hole (13) forms a first magnetic barrier between the outer hole surface near the outer side of the rotor body (1) and the outer wall of the rotor body (1), the width of the first magnetic barrier is a, and the length of the air gap for the rotor core to be matched with the stator is D;
1.6≥A/D≥1。
3. a rotor core according to claim 1, characterized in that the auxiliary hole (13) has a length J and the permanent magnet slots (2) have a magnetic steel length G;
0.35≥J/G≥0.1。
4. a rotor core according to claim 1, characterized in that the width of the outer hole surface of the auxiliary hole (13) towards the outer side of the rotor body (1) is K, and the length of the air gap of the rotor core for cooperation with the stator is D;
5≥K/D≥1.5。
5. a rotor core according to claim 1, characterized in that the width of the communication part of the auxiliary hole (13) and the permanent magnet slot (2) is P, and the length of the air gap for the rotor core to cooperate with the stator is D;
2≥P/D≥0.5。
6. a rotor core according to claim 1, characterized in that the width of the second magnetically isolated bridge increases in the direction of the centre of the rotor body (1) towards the outside thereof.
7. A rotor core according to claim 6, characterized in that the distance between the two end points of the second magnetically isolated bridge near the outer side of the rotor body (1) is T, and the length of the air gap for the rotor core to cooperate with the stator is D;
4.5≥T/D≥2.5。
8. a tangential motor rotor comprising a rotor core and tangentially magnetized permanent magnets disposed in permanent magnet slots thereof, wherein the rotor core is a rotor core according to any one of claims 1-7.
9. A tangential motor comprising a tangential motor rotor and a stator, wherein the tangential motor rotor is the tangential motor rotor of claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710675596.9A CN107276353B (en) | 2017-08-09 | 2017-08-09 | Tangential motor, tangential motor rotor and rotor core thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN109412300B (en) * | 2018-12-20 | 2024-09-27 | 珠海格力节能环保制冷技术研究中心有限公司 | Tangential motor, motor rotor and rotor core |
| CN110932433A (en) * | 2019-11-21 | 2020-03-27 | 常州鋐汇动力科技有限公司 | Built-in permanent magnet motor rotor structure |
| CN112994295B (en) * | 2021-04-06 | 2022-07-15 | 珠海格力电器股份有限公司 | Motor rotor and permanent magnet synchronous motor |
| EP4318884A4 (en) * | 2021-05-10 | 2024-10-16 | Midea Welling Motor Tech Shanghai Co Ltd | Rotor structure, motor structure, and laundry treatment device |
Citations (4)
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|---|---|---|---|---|
| FR2636480A1 (en) * | 1988-08-01 | 1990-03-16 | Alsthom Gec | Synchronous motor with permanent magnets |
| CN103872819A (en) * | 2012-12-10 | 2014-06-18 | 艾默生环境优化技术(苏州)有限公司 | Rotor assembly and permanent magnet motor including the same |
| CN105958689A (en) * | 2016-06-08 | 2016-09-21 | 珠海格力节能环保制冷技术研究中心有限公司 | Iron core structure, rotor component and permanent magnet motor |
| CN207234554U (en) * | 2017-08-09 | 2018-04-13 | 珠海格力节能环保制冷技术研究中心有限公司 | Tangential motor, tangential rotor and its rotor core |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2636480A1 (en) * | 1988-08-01 | 1990-03-16 | Alsthom Gec | Synchronous motor with permanent magnets |
| CN103872819A (en) * | 2012-12-10 | 2014-06-18 | 艾默生环境优化技术(苏州)有限公司 | Rotor assembly and permanent magnet motor including the same |
| CN105958689A (en) * | 2016-06-08 | 2016-09-21 | 珠海格力节能环保制冷技术研究中心有限公司 | Iron core structure, rotor component and permanent magnet motor |
| CN207234554U (en) * | 2017-08-09 | 2018-04-13 | 珠海格力节能环保制冷技术研究中心有限公司 | Tangential motor, tangential rotor and its rotor core |
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