CN107222045B - 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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- CN107222045B CN107222045B CN201710675641.0A CN201710675641A CN107222045B CN 107222045 B CN107222045 B CN 107222045B CN 201710675641 A CN201710675641 A CN 201710675641A CN 107222045 B CN107222045 B CN 107222045B
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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
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- 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
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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
- 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 tangential motor, a tangential motor rotor and a rotor core thereof, wherein the rotor core comprises a rotor body (1) and magnetic steel grooves (3) arranged on the rotor body (1), 2N magnetism isolating holes (2) are arranged on a rotor magnetic pole between two adjacent magnetic steel grooves (3), the 2N magnetism isolating holes (2) are symmetrically arranged on two sides of a magnetic pole central line of the rotor magnetic pole, and N is a positive integer; the magnetism isolating holes (2) are bar-shaped holes which are concentrically arranged with the rotor body (1), and the outer side wall and the inner side wall of the magnetism isolating holes are arc-shaped surfaces which are concentrically arranged with the rotor body (1). The rotor core provided by the invention enables the widths of the magnetism isolating holes in the radial direction of the rotor body to be consistent. By arranging the magnetism isolating holes on the rotor magnetic pole, an air gap magnetic field can be effectively achieved, the air gap magnetic density and the sine degree of counter potential waveforms are improved, the harmonic duty ratio is reduced, and then vibration noise of the motor is reduced.
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 core comprises a rotor body and magnetic steel grooves arranged on the rotor body, 2N magnetism isolating holes are formed in rotor magnetic poles between two adjacent magnetic steel grooves, 2N magnetism isolating holes are symmetrically formed in two sides of a magnetic pole center line of the rotor magnetic poles, and N is a positive integer;
the magnetism isolating holes are bar-shaped holes which are concentrically arranged with the rotor body, and the outer side wall and the inner side wall of the magnetism isolating holes are arc-shaped surfaces which are concentrically arranged with the rotor body.
Preferably, in the rotor core, the same positions of the plurality of magnetic isolation holes have the same distance from the center of the rotor body.
Preferably, in the rotor core, a first magnetic isolation bridge is formed between an outer side hole wall of the magnetic isolation hole and an outer wall of the rotor body, the width of the first magnetic isolation bridge is a, and the length of an air gap of the rotor core, which is used for being matched with a stator, is D;
2.5≥A/D≥1.3。
preferably, in the rotor core, an angle between a hole end wall of the magnetism isolating hole, which is close to the magnetic steel groove, and a magnetic steel center line of the magnetic steel groove is B, and an angle occupied by a single magnetic pole of the rotor core is C;
0.35≥B/C≥0.25。
preferably, in the rotor core, B/C is more than or equal to 0.32 and more than or equal to 0.3.
Preferably, in the rotor core, a hole end wall of the magnetism isolating hole is disposed along a radial direction of the rotor body.
Preferably, in the rotor core, the radian of the magnetic isolation hole in the circumferential direction is E, and the angle occupied by a single magnetic pole of the rotor core is C;
0.2≥E/C≥0.1。
preferably, in the rotor core, a width between an outer side hole wall of the magnetic isolation hole and an inner side hole wall of the magnetic isolation hole is F, a first magnetic isolation bridge is formed between the outer side hole wall of the magnetic isolation hole and the outer wall of the rotor body, and the width of the first magnetic isolation bridge is a;
1.3≥F/A≥0.6。
preferably, the rotor core further comprises an auxiliary hole arranged in a solid core part between the magnetism isolating hole and the outer wall of the rotor body;
the auxiliary holes are the same as the magnetic isolation holes in number and are symmetrically arranged on two sides of the magnetic pole center line of the rotor magnetic pole;
the auxiliary holes and the magnetic isolation holes corresponding to the auxiliary holes are arranged in a laminated mode, and a second magnetic isolation bridge is formed between the auxiliary holes and the magnetic isolation holes.
Preferably, in the rotor core, the auxiliary hole is a bar hole concentrically arranged with the rotor body, and the outer side wall and the inner side wall of the auxiliary hole are arc surfaces concentrically arranged with the rotor body.
Preferably, in the rotor core, a third magnetic isolation bridge is formed between the outer side hole wall of the auxiliary hole and the outer wall of the rotor body, the width of the third magnetic isolation bridge is H, and the length of an air gap of the rotor core, which is used for being matched with the stator, is D;
1.1≥H/D≥0.7。
preferably, in the rotor core, a width between an outer side hole wall and an inner side hole wall of the auxiliary hole is K, and a width between an outer side hole wall and an inner side hole wall of the magnetism isolating hole is F;
0.5≥K/F≥0.3。
preferably, in the above rotor core, the thickness of the auxiliary hole in the radial direction of the rotor body is smaller than the thickness of the magnetism isolating hole in the radial direction of the rotor body.
Preferably, in the rotor core, an angle between a hole end wall of the auxiliary hole, which is close to the magnetic steel groove, and a magnetic steel center line of the magnetic steel groove is I, and an angle occupied by a single magnetic pole of the rotor core is C;
0.4≥I/C≥0.35。
preferably, in the rotor core, a hole end wall of the auxiliary hole is provided along a radial direction of the rotor body.
Preferably, in the rotor core, the arc in the circumferential direction of the auxiliary hole is J, and the arc in the circumferential direction of the magnetism isolating hole is E;
0.6≥J/E≥0.3。
preferably, in the rotor core, an angle between a hole end wall of the auxiliary hole, which is close to the magnetic steel groove, and a magnetic steel center line of the magnetic steel groove is I, and an angle between a side hole wall of the magnetic isolation hole, which is close to the magnetic steel groove, and a magnetic steel center line of the magnetic steel groove is B; the included angle between the tail end of the magnetism isolating hole and the central line of the permanent magnet is B; i is greater than B.
Preferably, in the above rotor core, a minimum distance between the two auxiliary holes symmetrically arranged with each other in the rotor magnetic pole is smaller than a minimum distance between the two magnetism isolating holes symmetrically arranged.
The invention also provides a tangential motor rotor, which comprises a rotor core and tangential magnetization permanent magnets arranged in the magnetic steel grooves 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, 2N magnetism isolating holes are formed in the rotor magnetic pole between two adjacent magnetic steel grooves, so that the 2N magnetism isolating holes are symmetrically formed in two sides of the magnetic pole center line of the rotor magnetic pole; the magnetic isolation holes are bar-shaped holes which are arranged concentrically with the rotor body, and the outer side wall and the inner side wall of the magnetic isolation holes are arc-shaped surfaces which are arranged concentrically with the rotor body. So that the width of the magnetism isolating hole in the radial direction of the rotor body is consistent. By arranging the magnetism isolating holes on the rotor magnetic pole, an air gap magnetic field can be effectively achieved, the air gap magnetic density and the sine degree of counter potential waveforms are improved, the harmonic duty ratio is reduced, and then vibration noise of the motor is reduced.
The invention also provides a tangential motor rotor with the rotor core and a tangential motor. Since the rotor core has the above technical effects, the tangential motor rotor having the rotor core, the motor 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 view of a rotor core according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second structure of a rotor core according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a motor according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the relationship between the counter potential harmonic duty ratio and B/C provided by the embodiment of the invention;
FIG. 5 is a graph of the counter-potential harmonic duty cycle and E/C relationship of the no-load flux linkage of the tangential motor according to an embodiment of the present invention;
FIG. 6 is a graph of total content of breath magnetic field harmonics versus J/E for a tangential motor according to an embodiment of the present invention.
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, 2 and 3, an embodiment of the present invention provides a rotor core, which includes a rotor body 1, a magnetism isolating hole 2 and a magnetic steel groove 3. The magnetic steel grooves 3 are arranged on the rotor body 1, the magnetism isolating holes 2 are arranged on the rotor magnetic poles between two adjacent magnetic steel grooves 3, and the number of the magnetism isolating holes 2 is 2N, wherein N is a positive integer; the 2N magnetism isolating holes 2 are symmetrically arranged on two sides of the magnetic pole center line of the rotor magnetic pole. The magnetism isolating holes 2 are bar-shaped holes which are arranged concentrically with the rotor body 1, and the outer side wall and the inner side wall of the magnetism isolating holes are arc-shaped surfaces which are arranged concentrically with the rotor body 1.
According to the rotor core provided by the embodiment of the invention, 2N magnetism isolating holes 2 are arranged on the rotor magnetic pole between two adjacent magnetic steel grooves 3, so that the 2N magnetism isolating holes 2 are symmetrically arranged on two sides of the magnetic pole central line of the rotor magnetic pole; the magnetism isolating holes 2 are bar-shaped holes which are arranged concentrically with the rotor body 1, and the outer side wall and the inner side wall of the magnetism isolating holes are arc-shaped surfaces which are arranged concentrically with the rotor body 1. So that the width of the magnetism isolating hole 2 in the radial direction of the rotor body 1 is uniform. By arranging the magnetism isolating holes 2 on the rotor magnetic pole, an air gap magnetic field can be effectively achieved, the air gap magnetic density and the sine degree of counter potential waveforms are improved, the harmonic duty ratio is reduced, and then the vibration noise of the motor is reduced.
It will be appreciated that in this embodiment, the number of the magnetic steel grooves 3 is an even number greater than or equal to 4, the permanent magnets are located in the magnetic steel grooves 3, and two adjacent permanent magnets have the same polarity and are oppositely disposed. The outer side hole wall of the magnetism isolating hole 2 is a hole wall of the strip-shaped hole close to the outer side of the rotor body 1; the inner side hole wall of the magnetism isolating hole 2 is a hole wall of the strip-shaped hole close to the circle center of the rotor body 1.
In this embodiment, N is 1, that is, each rotor magnetic pole has two magnetic isolation holes 2, and the two magnetic isolation holes 2 are symmetrically disposed on two sides of the magnetic pole center line of the rotor magnetic pole.
Further, the same positions of the plurality of magnetism isolating holes 2 have the same distance from the center of the rotor body 1. That is, the outer side hole walls of the plurality of magnetism isolating holes 2 are positioned on the same concentric circle, and the circle center of the concentric circle coincides with the circle center of the rotor body 1; the inner side hole walls of the plurality of magnetism isolating holes 2 are positioned on the same concentric circle, and the circle center of the concentric circle coincides with the circle center of the rotor body 1. Other structures can be adopted, for example, the same distance between the same part of the separation magnetic hole 2 and the center of the rotor body 1 is the same, and the distance is L1; the other part of the magnetic hole 2 is separated from the same part of the magnetic hole by the same distance from the circle center of the rotor body 1, the distance is L2, and L1 is not equal to L2.
Preferably, a first magnetism isolating bridge is formed between the outer side hole wall of the magnetism isolating hole 2 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 for being matched with the stator 5 is D. Simulation researches show that the ratio of the distance from the magnetism isolating hole 2 to the outer wall of the rotor body 1 to the length of the air gap has a larger influence on the counter potential harmonic wave. When A/D is more than or equal to 1.3, a distance is reserved between the magnetism isolating hole 2 and the outer wall of the rotor body 1, namely, a first magnetism isolating bridge is reserved at the outer wall of the rotor body 1, and a small part of magnetism is transmitted to the stator 5 through the magnetism isolating bridge, so that an air gap magnetic field is improved, the waveform sine degree of the air gap magnetic density is improved, the air gap magnetic density and counter potential harmonic ratio are reduced, and further the vibration noise of the motor is reduced; however, when the A/D is more than 2.5, the width of the first magnetic isolation bridge is too large, so that excessive magnetic flux is transmitted to the stator 5 through the first magnetic isolation bridge, the air gap flux density at the tooth position of the stator 5 is excessively concentrated, the waveform of the air gap flux density is distorted, the harmonic duty ratio is increased, the harmonic loss is increased, and the motor efficiency is reduced. Thus, preferably, 2.5. Gtoreq.A/D. Gtoreq.1.3.
As shown in fig. 1, 2 and 4, the angle between the end wall of the magnetism isolating hole 2, which is close to the magnetic steel groove 3, and the magnetic steel center line of the magnetic steel groove 3 is B, and the angle occupied by a single magnetic pole of the rotor core is C; simulation researches show that the ratio of the angle B between the end wall of the magnetism isolating hole 2, which is close to the magnetic steel groove 3, and the magnetic steel center line of the magnetic steel groove 3 to the angle C occupied by a single magnetic pole has larger influence on the counter potential harmonic wave. Namely, the position of the magnetism isolating hole 2 away from the magnetic steel groove 3 has a large influence on the harmonic duty ratio. When B/C is more than or equal to 0.25, a certain gap is reserved between the magnetism isolating hole 2 and the magnetic steel groove 3, so that a part of magnetic flux is transmitted along the gap, because the magnetism isolating hole 2 is filled with air, the magnetic conductance of the magnetism isolating hole 2 is small, the magnetic flux transmitted from the position of the magnetism isolating hole 2 is small, the trend of the magnetic flux in the magnetic pole is changed, and therefore the waveform shape of the air gap flux density along the surface of the stator is changed, the waveform shape is more similar to a sine wave, the air gap flux density and the counter-potential harmonic ratio are reduced, and the vibration noise of the motor is reduced. However, when B/C is more than 0.35, the gap between the magnetism isolating hole 2 and the magnetic steel groove 3 is overlarge, and the magnetic flux transmitted along the gap is too much, so that the magnetic pole surface at the position is overlarge in magnetic density, the waveform distortion of the magnetic density of the air gap is serious, the harmonic duty ratio is increased, the harmonic loss is increased, the motor efficiency is reduced, and the motor vibration noise is increased. Thus, preferably, 0.35.gtoreq.B/C.gtoreq.0.25.
The hole end wall of the magnetism isolating hole 2 is a hole wall connecting the outer hole wall of the magnetism isolating hole 2 and the inner hole wall of the magnetism isolating hole 2. To further reduce the harmonic duty cycle, 0.32 is greater than or equal to B/C is greater than or equal to 0.3. Simulation researches show that when the ratio of B/C is set between 0.3 and 0.32, the magnetic flux transmitted from the gap between the magnetism isolating hole and the magnetic steel groove is optimal, the magnetic flux of magnetism isolating Kong Zuge is optimal, the uniformity of the air gap flux guide of the magnetic circuit is optimal, the waveform distortion rate of the air gap flux density is minimum, the harmonic wave duty ratio is minimum, and the vibration noise of the motor is minimum. As shown in fig. 4, under this condition, the harmonic ratio of the motor provided by the present embodiment is less than 10%.
In order to facilitate processing and further ensure that the widths of the positions of the magnetism isolating holes 2 in the radial direction of the rotor body 1 are consistent, the hole end walls of the magnetism isolating holes 2 are arranged along the radial direction of the rotor body 1.
Preferably, the radian of the magnetic isolation hole 2 in the circumferential direction is E, and the angle occupied by a single magnetic pole of the rotor core is C; through researches, the ratio of the radian of the magnetism isolating hole 2 in the circumferential direction to the angle occupied by the single magnetic pole has a great influence on the harmonic duty ratio. As shown in FIG. 5, when E/C is more than or equal to 0.1, the radian of the magnetic isolation hole 2 is larger, and air is arranged in the magnetic isolation hole 2, so that the magnetic resistance of the magnetic isolation hole 2 is larger, and the trend of magnetic flux in the magnetic pole is changed; in addition, the magnetism isolating holes are close to an air gap (a gap between the rotor and the stator), so that air gap magnetic field distribution is improved, waveforms of air gap magnetic density are further improved, harmonic duty ratio is reduced, counter potential harmonic duty ratio is reduced, harmonic loss is reduced, motor efficiency is further effectively improved, and motor vibration noise is reduced. However, when E/C is greater than 0.2, the length of the magnetism isolating holes 2 is too long, so that the number of the magnetism conducting solid parts between the two magnetism isolating holes 2 is small, the difficulty that magnetic force lines generated by an inner permanent magnet enter a stator is easy to become large, no-load flux linkage of the motor is reduced, and the efficiency of the motor is reduced. Thus, preferably, 0.2. Gtoreq.E/C. Gtoreq.0.1.
As shown in fig. 1, the width between the outer side hole wall of the magnetism isolating hole 2 and the inner side hole wall is F, and a first magnetism isolating bridge is formed between the outer side hole wall of the magnetism isolating hole 2 and the outer wall of the rotor body 1, and the width of the first magnetism isolating bridge is a. Through researches, the width of the magnetism isolating hole 2 is the ratio of F to the width A of the first magnetism isolating bridge (the distance from the magnetism isolating hole 2 to the outer wall of the rotor body 1) and has larger influence on the harmonic duty ratio, the larger the width F of the magnetism isolating hole 2 is, the larger the magnetic resistance of the magnetism isolating hole 2 is, when F/A is more than or equal to 0.6, the larger the magnetic resistance of the magnetism isolating hole 2 is, the magnetic flux passing through the magnetism isolating hole 2 is reduced, the distribution of an air gap magnetic field is improved, the sine degree of the waveform of the air gap magnetic density is improved, the harmonic duty ratio is reduced, the counter potential harmonic duty ratio is reduced, and the vibration noise of a motor is reduced. However, when F/A > 1.3, the magnetic resistance of the position of the magnetism isolating hole 2 is too large, the magnetic flux passing through the magnetism isolating hole 2 is too small, the waveform distortion rate of the air gap magnetic density is improved, the air gap magnetic density and counter potential harmonic ratio are increased, the vibration noise is increased, meanwhile, the width F of the magnetism isolating hole 2 is too large, the magnetic conduction area of the magnetic pole is reduced, the output torque of the motor is reduced, and the mechanical strength of the position is not high. Thus, preferably, 1.3. Gtoreq.F/A. Gtoreq.0.6.
The rotor core provided by the embodiment of the invention further comprises an auxiliary hole 4 arranged at the solid part of the core between the magnetism isolating hole 2 and the outer wall of the rotor body 1; the auxiliary holes 4 are the same as the magnetic isolation holes 2 in number and are symmetrically arranged on two sides of the magnetic pole center line of the rotor magnetic pole; the auxiliary holes 4 and the corresponding magnetism isolating holes 2 are arranged in a lamination mode, and a second magnetism isolating bridge is formed between the auxiliary holes 4 and the magnetism isolating holes 2. Through the arrangement, the magnetic flux trend in the magnetic pole is further guided, the air gap flux density waveform is optimized, the air gap flux density and the counter potential harmonic duty ratio are reduced, the motor vibration noise is reduced, the harmonic loss is reduced, and the motor efficiency is improved.
Preferably, the auxiliary holes 4 are bar-shaped holes concentrically arranged with the rotor body 1, and the outer side walls and the inner side walls thereof are arc-shaped surfaces concentrically arranged with the rotor body 1.
In this embodiment, a third magnetic bridge is formed between the outer wall of the auxiliary hole 4 and the outer wall of the rotor body 1, the width of the third magnetic bridge is H, and the length of the air gap between the rotor core and the stator 5 is D. Simulation researches show that the ratio of the width of the third magnetic isolation bridge to the length D of the air gap of the rotor core, which is used for being matched with the stator 5, has a larger influence on the harmonic ratio, when H/D is more than or equal to 0.7, the third magnetic isolation bridge is reserved between the auxiliary hole 4 and the outer wall of the rotor body 1, a small part of magnetic flux is allowed to pass through the third magnetic isolation bridge, and the auxiliary hole 4 further limits the magnetic flux to pass through the middle part of the magnetic pole, so that the magnetic density waveform of the air gap on the surface of the rotor is improved, and the harmonic ratio is reduced; however, when H/D is more than 1.1, the magnetic flux passing through the third magnetism isolating bridge is increased, the air gap flux density corresponding to the middle surface of the magnetic pole is too dense, the waveform distortion rate of the air gap flux density is improved, the harmonic wave duty ratio is increased, and the vibration noise of the motor is increased. Thus, preferably, 1.1.gtoreq.H/D.gtoreq.0.7.
Preferably, the width between the outer side hole wall and the inner side hole wall of the auxiliary hole 4 is K, and the width between the outer side hole wall and the inner side hole wall of the magnetism isolating hole 2 is F; simulation researches show that the ratio of the width of the auxiliary hole 4 to the width of the magnetism isolating hole 2 has a larger influence on the harmonic duty ratio. When K/F is more than or equal to 0.3, the outer side of the magnetism isolating hole 2 is perforated (auxiliary hole 4), the width of the auxiliary hole 4 is increased, the transmission of magnetic flux along the middle part of the magnetic pole is further limited, the waveform of the air gap flux density of the surface of the rotor is further improved, the harmonic wave occupation ratio is reduced, and the vibration noise is reduced; however, when K/F > 0.5, the width of the auxiliary hole 4 is too wide, the air gap density of the rotor magnetic pole surface corresponding to the auxiliary hole 4 is too low, waveform distortion is serious, harmonic duty ratio is increased, harmonic loss is increased, iron loss is increased, motor efficiency is reduced, and motor vibration noise is increased. Therefore, in the rotor core of this embodiment, 0.5.gtoreq.K/F.gtoreq.0.3.
Because the auxiliary hole 4 and the magnetism isolating hole 2 are bar-shaped holes, and the outer side hole wall and the inner side hole wall of the bar-shaped holes are arc surfaces which are concentric with the rotor body 1, the thickness of the auxiliary hole 4 in the radial direction of the rotor body 1 and the thickness of the magnetism isolating hole 2 in the radial direction of the rotor body 1 are constant values. Preferably, the thickness of the auxiliary hole 4 in the radial direction of the rotor body 1 is smaller than the thickness of the magnetism isolating hole 2 in the radial direction of the rotor body 1.
Preferably, the angle between the end wall of the auxiliary hole 4, which is close to the magnetic steel groove 3, and the magnetic steel center line of the magnetic steel groove 3 is I, and the angle occupied by a single magnetic pole of the rotor core is C; simulation researches show that the ratio of the angle between the end wall of the auxiliary hole 4 and the center line of the magnetic steel to the angle occupied by a single magnetic pole is C has a great influence on the harmonic duty ratio. When the I/C is more than or equal to 0.35, a gap is reserved between the auxiliary hole 4 and the magnetic steel groove 3, so that the trend of magnetic flux is further limited, more magnetic flux is transmitted along the two sides of the magnetic pole, less magnetic flux is transmitted along the middle part of the magnetic pole, the waveform of the air gap flux density is improved, and the harmonic wave occupation ratio is reduced. However, when the I/C is more than 0.4, the gap between the auxiliary hole 4 and the magnetic steel groove 3 is overlarge, the air gap density corresponding to the two sides of the magnetic pole is high, the air gap density corresponding to the middle part of the magnetic pole is low, the air gap density is suddenly changed, the waveform distortion of the air gap density is serious, the harmonic wave ratio is increased, the torque pulsation is increased, and the vibration noise of the motor is increased. Thus, in this embodiment, 0.4. Gtoreq.I/C. Gtoreq.0.35.
Preferably, the hole end wall of the auxiliary hole 4 is disposed in the radial direction of the rotor body 1. Through the arrangement, the auxiliary hole 4 is convenient to process; further, the width of each position of the magnetism isolating hole 2 in the radial direction of the rotor body 1 is further ensured to be uniform.
The radian of the auxiliary hole 4 in the circumferential direction is J, and the radian of the magnetism isolating hole 2 in the circumferential direction is E; simulation researches show that the ratio of the radian of the auxiliary hole 4 to the radian of the magnetism isolating hole 2 has a large influence on the harmonic duty ratio. The radian of the auxiliary hole 4 influences the trend of magnetic flux at the two sides of the magnetic pole in the magnetic pole and the middle part of the magnetic pole, and further influences the size of the air gap flux density at all positions of the surface of the rotor. As shown in FIG. 6, when the J/E is more than or equal to 0.6 and more than or equal to 0.3, the air gap magnetic field distribution is optimal, the waveform sine degree of the air gap magnetic density is best, the air gap magnetic density and counter potential harmonic wave ratio are lowest, the vibration noise is lowest, the iron loss of the motor is lowest, and the motor efficiency is highest.
In order to obtain better improved air-gap magnetic field distribution effect, the angle between the end wall of the auxiliary hole 4, which is close to the magnetic steel groove 3, and the magnetic steel center line of the magnetic steel groove 3 is I, and the angle between the side hole wall of the magnetism isolating hole 2, which is close to the magnetic steel groove 3, and the magnetic steel center line of the magnetic steel groove 3 is B; the included angle between the tail end of the magnetism isolating hole 2 and the center line of the permanent magnet is B; i is greater than B.
And, the minimum distance between two auxiliary holes 4 symmetrically arranged with each other in the rotor magnetic pole is smaller than the minimum distance between two magnetism isolating holes 2 symmetrically arranged. In this embodiment, the number of the auxiliary holes 4 and the magnetic isolation holes 2 on each rotor magnetic pole is two, and the auxiliary holes are symmetrically arranged on two sides of the magnetic pole center line of the rotor magnetic pole.
Because I is greater than B, the minimum distance between two auxiliary holes 4 that mutually symmetry set up in the rotor magnetic pole is less than the minimum distance between two magnetism isolating holes 2 that symmetry set up, and the thickness of auxiliary hole 4 in rotor body 1 radial direction is less than magnetism isolating holes 2 in rotor body 1 radial direction, make magnetism isolating holes 2 and auxiliary hole 4 on every rotor magnetic pole constitute and form a big trapezoidal magnetism isolating hole integrated configuration that narrow down is wide, and the magnetic force line inside the permanent magnet can be comparatively easy through magnetism isolating holes 2 and auxiliary holes 4, produce bigger permanent magnet magnetic chain.
The embodiment of the invention also provides a tangential motor rotor, which comprises a rotor core and tangential magnetization permanent magnets arranged in the magnetic steel 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 6 and a stator 5, wherein the tangential motor rotor 6 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 (16)
1. The rotor core comprises a rotor body (1) and magnetic steel grooves (3) arranged on the rotor body (1), and is characterized in that 2N magnetism isolating holes (2) are formed in rotor magnetic poles between two adjacent magnetic steel grooves (3), the 2N magnetism isolating holes (2) are symmetrically arranged on two sides of a magnetic pole center line of the rotor magnetic pole, and N is a positive integer;
the magnetism isolating holes (2) are strip-shaped holes which are concentrically arranged with the rotor body (1), and the outer side wall and the inner side wall of the magnetism isolating holes are arc-shaped surfaces which are concentrically arranged with the rotor body (1);
a first magnetism isolating bridge is formed between the outer side hole wall of the magnetism isolating hole (2) 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 used for being matched with the stator (5), is D;2.5 The A/D is more than or equal to 1.3;
the angle between the side hole wall of the magnetism isolating hole (2) close to the magnetic steel groove (3) and the magnetic steel center line of the magnetic steel groove (3) is B, and the angle occupied by a single magnetic pole of the rotor core is C;0.35 More than or equal to 0.25 of B/C;
the radian of the magnetic isolation hole (2) in the circumferential direction is E, and the angle occupied by a single magnetic pole of the rotor core is C;0.2 E/C is more than or equal to 0.1;
the width between the outer side hole wall of the magnetism isolating hole (2) and the inner side hole wall of the magnetism isolating hole is F, a first magnetism isolating bridge is formed between the outer side hole wall of the magnetism isolating hole (2) and the outer wall of the rotor body (1), and the width of the first magnetism isolating bridge is A;1.3 F/A is more than or equal to 0.6.
2. A rotor core according to claim 1, characterized in that the same parts of the plurality of magnetic shield holes (2) are at the same distance from the center of the rotor body (1).
3. The rotor core according to claim 1, wherein 0.32. Gtoreq.b/C. Gtoreq.0.3.
4. Rotor core according to claim 1, characterized in that the bore end walls of the magnetic barrier bores (2) are arranged in the radial direction of the rotor body (1).
5. The rotor core according to any one of claims 1-4, further comprising an auxiliary hole (4) provided in a solid portion of the core between the magnetism isolating hole (2) and the outer wall of the rotor body (1);
the auxiliary holes (4) are the same as the magnetic isolation holes (2) in number and are symmetrically arranged on two sides of the magnetic pole center line of the magnetic pole of the rotor;
the auxiliary holes (4) and the corresponding magnetism isolating holes (2) are arranged in a layering mode, and a second magnetism isolating bridge is formed between the auxiliary holes (4) and the magnetism isolating holes (2).
6. A rotor core according to claim 5, characterized in that the auxiliary holes (4) are bar-shaped holes arranged concentrically with the rotor body (1), and the outer side walls and the inner side walls thereof are arc-shaped surfaces arranged concentrically with the rotor body (1).
7. A rotor core according to claim 6, characterized in that a third magnetic barrier bridge is formed between the outer side hole wall of the auxiliary hole (4) and the outer wall of the rotor body (1), the width of the third magnetic barrier bridge is H, and the length of the air gap of the rotor core for being matched with the stator (5) is D;
1.1≥H/D≥0.7。
8. a rotor core according to claim 6, characterized in that the width between the outer side hole wall and the inner side hole wall of the auxiliary hole (4) is K, and the width between the outer side hole wall and the inner side hole wall of the magnetism isolating hole (2) is F;
0.5≥K/F≥0.3。
9. a rotor core according to claim 6, characterized in that the thickness of the auxiliary hole (4) in the radial direction of the rotor body (1) is smaller than the thickness of the magnetism isolating hole (2) in the radial direction of the rotor body (1).
10. A rotor core according to claim 5, characterized in that the angle between the end wall of the auxiliary hole (4) close to the magnetic steel groove (3) and the magnetic steel center line of the magnetic steel groove (3) is I, and the angle occupied by the single magnetic pole of the rotor core is C;
0.4≥I/C≥0.35。
11. a rotor core according to claim 5, characterized in that the bore end wall of the auxiliary bore (4) is arranged in the radial direction of the rotor body (1).
12. The rotor core according to claim 5, wherein the arc in the circumferential direction of the auxiliary hole (4) is J, and the arc in the circumferential direction of the magnetism isolating hole (2) is E;
0.6≥J/E≥0.3。
13. the rotor core according to claim 5, characterized in that an angle between a hole end wall of the auxiliary hole (4) close to the magnetic steel groove (3) and a magnetic steel center line of the magnetic steel groove (3) is I, and an angle between a side hole wall of the magnetism isolating hole (2) close to the magnetic steel groove (3) and a magnetic steel center line of the magnetic steel groove (3) is B; the included angle between the tail end of the magnetism isolating hole (2) and the central line of the permanent magnet is B; i is greater than B.
14. A rotor core according to claim 5, characterized in that the minimum distance between two of the auxiliary holes (4) of the rotor poles, which are symmetrically arranged with respect to each other, is smaller than the minimum distance between two of the magnetically isolated holes (2), which are symmetrically arranged.
15. A tangential motor rotor comprising a rotor core and tangentially magnetized permanent magnets disposed in a magnetic steel groove thereof, wherein the rotor core is a rotor core as claimed in any one of claims 1 to 14.
16. A tangential motor comprising a tangential motor rotor (6) and a stator (5), characterized in that the tangential motor rotor (6) is a tangential motor rotor according to claim 15.
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| CN201710675641.0A CN107222045B (en) | 2017-08-09 | 2017-08-09 | Tangential motor, tangential motor rotor and rotor core thereof |
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| CN107800205A (en) * | 2017-11-28 | 2018-03-13 | 深圳市优必选科技有限公司 | chip and motor in motor |
| CN109412300A (en) * | 2018-12-20 | 2019-03-01 | 珠海格力节能环保制冷技术研究中心有限公司 | Tangential motor, rotor and rotor core |
| CN112421924B (en) * | 2020-11-09 | 2021-09-10 | 广东威灵电机制造有限公司 | Motor and household appliance |
| CN117811299B (en) * | 2024-02-28 | 2024-05-10 | 苏州拓氪科技有限公司 | Harmonic modulation permanent magnet synchronous motor |
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