CN113346652A - Permanent magnet motor - Google Patents
Permanent magnet motor Download PDFInfo
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- CN113346652A CN113346652A CN202110809037.9A CN202110809037A CN113346652A CN 113346652 A CN113346652 A CN 113346652A CN 202110809037 A CN202110809037 A CN 202110809037A CN 113346652 A CN113346652 A CN 113346652A
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- bridge
- permanent magnet
- lamination
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- tooth
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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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew
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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)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention relates to the field of permanent magnet motors, and discloses a permanent magnet motor which comprises a shell, a stator core, a rotor core and a permanent magnet, wherein the stator core is arranged on the shell; the rotor core comprises at least two full bridge type lamination groups and at least one half bridge type lamination group, wherein the lamination in the full bridge type lamination group comprises a plurality of full bridge type lamination sheets which are connected with a first center connecting bridge and distributed along the circumferential direction, the lamination in the half bridge type lamination group comprises at least one separating lamination sheet which is connected with a second center and distributed along the circumferential direction, the full bridge type lamination group and the half bridge type lamination group are stacked into each along the axial direction, the half bridge type lamination group is positioned between the two full bridge type lamination groups, adjacent sectors in the same stacked lamination layer of the full bridge type lamination group are asymmetrical, and the permanent magnet is placed in a groove between the adjacent sectors. The invention can simplify the production process of the motor and improve the structural strength of the motor.
Description
The application is a divisional application with the application date of '2018.11.30', the application number of '201811459944. X' and the application name of 'an interior permanent magnet motor'.
Technical Field
The invention relates to the field of permanent magnet motors, in particular to a permanent magnet motor.
Background
The traditional brushless direct current motor adopts a surface-mounted magnetic shoe or a built-in radial magnetizing magnetic steel structure, has low power density and is limited to cost factors, and the magnetic flux of each pole of the motor is improved by a tangential magnetizing parallel magnetic circuit structure. The existing tangential magnetizing structure still has the problem of large magnetic flux leakage, and the performance improvement of the motor is limited.
Existing rotor cores have at least one tooth sector disconnected from the rotor collar while at least one tooth sector is connected to the sleeve. Thereby suppressing leakage flux at the paraxial region. The rotor iron core shaft sleeve is externally provided with a positioning convex part for positioning and supporting the permanent magnet. Through the analysis, because tooth portion sector axial of this scheme rotor disconnection does not have fixed support component, axial structure intensity is relatively poor, is unfavorable for large-scale production, and simultaneously, foretell location arch for supporting and fixing a position the permanent magnet will produce from the interlinkage magnetic leakage, reduces motor power density, is unfavorable for promoting the performance.
On the other hand, the built-in tangential magnetizing motor has the advantages that due to the improvement of power density, a stator core is easy to saturate to generate higher core loss, and the motor efficiency is reduced. While the electromagnetic wave enhancement results in an increase in vibration noise. In the prior art, vibration noise is inhibited by methods such as a skewed pole chute, the difficulty of a manufacturing process is increased and the production time is increased by a corresponding method, for example, if a stator core with a strip-shaped curved circle is designed, tooth parts are inwards extended from an annular yoke part of a stator, and a slot inserting groove is formed between two adjacent stator tooth parts. The stator has balanced magnetic circuit, moderate and average magnetic density, reduced local saturation, simple process and high production efficiency. However, the above patent only depends on parameters such as stator slot width, tooth width and yoke width to perform average processing on magnetic density, and fails to consider the influence of stator shape and structure on motor magnetic field, loss and the like, and is not applicable to high power density motor structure, and does not provide a structure capable of comprehensively considering power density and suppressing vibration and reducing noise in order to consider reducing motor vibration noise by a combination method between a stator core and a casing.
Therefore, there is a need for a permanent magnet brushless dc motor with simple process, reliable structure, high power density and low vibration noise, which is suitable for mass production and manufacturing.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a permanent magnet motor which can simplify the production process and improve the structural strength and the power density.
In order to solve the technical problem, the invention provides a permanent magnet motor, which comprises a casing, a stator core, a rotor core and a permanent magnet, wherein the stator core is arranged on the casing; the stator iron cores are distributed along the circumferential direction of the inner wall of the shell, and the rotor iron cores are arranged in a space surrounded by the stator iron cores; the rotor core comprises at least two full bridge type lamination groups and at least one half bridge type lamination group, wherein the lamination in the full bridge type lamination group comprises a first central connecting bridge and a plurality of full bridge type lamination sheets which are connected with the first central connecting bridge and distributed along the circumferential direction, the lamination in the half bridge type lamination group comprises a second central connecting bridge and at least one separating lamination sheet which is disconnected with the second central connecting bridge and distributed along the circumferential direction, and the full bridge type lamination group and the half bridge type lamination group are stacked along the axial direction, so that each half bridge type lamination group is positioned between the two full bridge type lamination groups, adjacent sectors in the same lamination layer of the full bridge type lamination group are asymmetric, and the permanent magnet is placed in a groove between the adjacent sectors; the contact point of the stator core and the shell forms a contact area, and the gap of the stator core and the shell which is not in contact forms a filling area by injecting filling materials.
Preferably, the fully-bridged lamination set comprises a plurality of fully-bridged laminations, and adjacent fully-bridged laminations are overlapped and stacked; the half-bridge type lamination group comprises a plurality of half-bridge type laminations, and the adjacent half-bridge type laminations are overlapped and stacked.
Preferably, the stator core includes a plurality of T-tooth yokes, each of which is enclosed along an inner wall of the casing.
Preferably, the number of the T-shaped tooth connecting yokes is two, so that the outer boundary of the stator core is in a regular dodecagon shape; the outer surface of each T-shaped tooth connecting yoke is parallel to the bottom of the stator slot, the tooth parts of the T-shaped tooth connecting yokes are perpendicular to the boundary surface of the yoke parts, and the number of the T-shaped tooth connecting yokes is equal to the number of the motor slots.
Preferably, each T-shaped tooth connecting yoke is provided with an inner riveting point and an outer riveting point which are different in size, and the diameter of the outer riveting point is larger than that of the inner riveting point; the outer riveting point is arranged at the center of the yoke part, and the inner riveting point is arranged in the middle of a tooth crown of the tooth part; the tooth crown of the tooth part is in an inclined shoulder type, and an included angle between an inner inclined plane of an inclined shoulder type tooth crown groove and the radial boundary of the tooth part is an obtuse angle.
Preferably, the full bridge type lamination comprises a plurality of full bridge stamped sheets, and a supporting bridge is arranged between every two adjacent full bridge stamped sheets; in two adjacent full bridge punching sheets, one of the two full bridge punching sheets protrudes outwards along the radial direction to form a wide magnetic bridge, the other one protrudes outwards along the radial direction to form a narrow magnetic bridge, and the width of the wide magnetic bridge is larger than that of the narrow magnetic bridge.
Preferably, the half-bridge type lamination comprises a plurality of half-bridge stamped sheets and a plurality of separated stamped sheets, one separated stamped sheet is arranged between every two adjacent half-bridge stamped sheets, and the separated stamped sheets are not in contact with the half-bridge stamped sheets; an isolating support bridge is arranged between the adjacent semi-bridge stamped sheets; the semi-bridge punching sheet is provided with a narrow magnetic bridge, the second center connecting bridge is provided with an isolating type wide magnetic bridge, and the width of the isolating type wide magnetic bridge is larger than that of the narrow magnetic bridge.
Preferably, the second central connecting bridge extends radially outwardly to form the narrow magnetic bridge within at least one of the laminations of the half-bridged lamination stack.
Preferably, the polarities of two adjacent permanent magnets are different.
Preferably, adjacent sectors in the same lamination layer of the half-bridge type lamination stack are asymmetric, the permanent magnets are placed in the grooves between the adjacent sectors, the polarities of the permanent magnets in the adjacent two grooves are different, and the corresponding second central connecting bridge in each groove extends outwards in the radial direction to form a radial groove bottom bulge; the support bridge is in contact with the permanent magnet and is axially overlapped with the radial groove bottom protrusion; the support bridge and the radial groove bottom bulge are equal in width on the side of the shaft sleeve; the radial groove bottom protrusion is separated from the permanent magnet, and the distance between the outermost side of the radial groove bottom protrusion and the permanent magnet is larger than 0.5 mm.
Preferably, the outer arc surface of each full bridge sheet comprises a plurality of sections of splines for reducing torque fluctuation;
the splines at least comprise main splines of the circular arc section and straight-line splines which are respectively arranged on two sides of the main splines of the circular arc section.
Preferably, the splines comprise a main spline of a circular arc segment, splines of circular arc segments respectively arranged at two sides of the main spline of the circular arc segment, and straight-line splines respectively arranged at the outer sides of the two splines of the circular arc segment.
Preferably, the outer circular arc surface of each half-bridge stamped piece and each separating stamped piece comprises a plurality of sections of splines for reducing torque fluctuation;
the splines at least comprise main splines of the circular arc section and straight-line splines which are respectively arranged on two sides of the main splines of the circular arc section.
Preferably, the splines comprise a main spline of a circular arc segment, splines of circular arc segments respectively arranged at two sides of the main spline of the circular arc segment, and straight-line splines respectively arranged at the outer sides of the two splines of the circular arc segment.
Preferably, the ratio of the number of full-bridge laminations in one of the full-bridge lamination sets to the number of half-bridge laminations in one of the half-bridge lamination sets is less than 0.5.
Preferably, the number of segments x of the spline satisfies:
if LCM (2P, S)/2P is odd, then x ═ LCM (2P, S)/2P ];
if LCM (2P, S)/2P is an even number, then x ═ LCM (2P, S)/2P ] -1;
wherein, x, LCM, P and S are the number of spline segments, the least common multiple, the pole pair number and the number of grooves respectively.
Preferably, if the circle center degree of the main spline of the arc segment is α, and the circle center angles of the remaining spline segments are β i, the following are satisfied:
the invention can simplify the production process of the motor and improve the structural strength of the motor. Through designing partition type supporting bridge and partition type wide magnetic bridge, the structural strength of the motor rotor is greatly improved. Meanwhile, the semi-bridge type lamination ensures that at least half of sectors of one lamination of the rotor core can be connected with the shaft sleeve, and the positioning is easy in the large-scale production process.
The invention can greatly reduce the self-interlinkage magnetic leakage at the bottom of the rotor slot, thereby improving the air gap magnetic flux, and can reduce the saturation degree of the motor and maximize the magnetic flux of each pole through the T-shaped tooth connecting yoke stator structure. Compared with the counter electromotive force coefficient of the traditional motor structure in full-bridge connection, the counter electromotive force coefficient of the motor adopting the structure is obviously improved, and when the motor runs under heavy load, the torque-current curve linearity of the motor is good, and the saturation phenomenon does not occur, so that the motor performance is improved.
Through the rotor five-segment spline structure, the counter potential harmonic distortion rate of the motor is low, and the sine degree of an air gap magnetic field is good, so that the tangential torque pulsation and radial vibration of the motor are reduced. Meanwhile, a T-shaped tooth yoke structure is adopted, and a filling area is arranged between the stator and the machine shell, so that the transmission of vibration between the stator and the machine shell is weakened, and the vibration reduction and noise reduction of the motor are realized.
The rotor slot bottom self-crosslinking magnetic leakage is reduced, so that the power density is improved, the high sine of an air gap magnetic field can be ensured, and the counter potential coefficient is greatly improved.
Drawings
FIG. 1 is a schematic block diagram of one embodiment of the present invention;
FIG. 2 is a schematic view of a rotor core according to an embodiment of the present invention;
FIG. 3 is a schematic view of a T-tooth yoke according to an embodiment of the present invention;
FIG. 4 is a schematic view of a stator assembly according to an embodiment of the present invention;
FIG. 5 is a schematic structural view of a half-bridge laminate in accordance with an embodiment of the present invention;
FIG. 6 is a schematic structural view of a fully bridged lamination in accordance with an embodiment of the present invention;
FIG. 7(a) is a prior art full-bridge connected rotor slot bottom self-crosslinking magnetic flux leakage distribution;
FIG. 7(b) is an enlarged partial view of the circled portion of the block in FIG. 7 (a);
FIG. 8(a) is the distribution of the self-interlinking leakage flux at the bottom of the bridge rotor slot without the partition support in the prior art;
FIG. 8(b) is an enlarged partial view of the circled portion of the block in FIG. 8 (a);
FIG. 9(a) is the self-interlinking leakage distribution of the bottom of the isolated support bridge rotor slot of the present invention;
FIG. 9(b) is an enlarged partial view of the circled portion of the block in FIG. 9 (a);
FIG. 10 is a comparison curve of the leakage coefficients of the self-interlinking slot bottoms at the paraxial positions of three motors with different structures;
FIG. 11 is a schematic view of the space within the regular polygon T-shaped tooth yoke stator slots in accordance with an embodiment of the present invention;
FIG. 12 is a schematic view of the space within a stator slot of a conventional construction;
FIG. 13 is a schematic view of the distribution of the splines of a five-spline rotor segment in accordance with an embodiment of the present invention;
FIG. 14 is the no-load back emf harmonic content of one embodiment of the present invention;
FIG. 15 is an exploded view of a rotor core according to an embodiment of the present invention;
figure 16 is a schematic view of a half-bridged lamination stack in accordance with an embodiment of the present invention.
Description of the reference numerals
A housing 1;
a stator core 2; a contact field 22; a fill field 23;
a T-shaped tooth yoke 21; a yoke portion 211; stator slot bottom 2111; a bending point 2112; a tooth portion 212; a sloping shoulder crown groove 2121; outer rivet points 213; inner rivet points 214;
a rotor core 3;
a full bridge lamination stack 31; a full bridge sheet 311; outer arcuate surface 3111; plastic-coated through holes 3112; rivet point 3113; a first central connecting bridge H1; a support bridge 312; a wide magnetic bridge 313; a narrow magnetic bridge 314;
half-bridge lamination stack 32; a half-bridge punch 321; an outer circular arc surface 3211 of the half-bridge stamped piece; a plastic-coated through hole 3212 of the half-bridge punching sheet; a riveting point 3213 of the half-bridge stamped piece; a separation punch 322; an outer arc surface 3221 of the separation punch; a plastic-coated through hole 3222 of the punching sheet is separated; rivet points 3223 of the punching sheets are separated; a second central connecting bridge H2; a partitioned support bridge 323; a partitioned wide magnetic bridge 324; a narrow magnetic bridge 325;
a permanent magnet 4; a shaft 5; a winding 6; an insulating frame 7.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
It should be mentioned in advance that in the description of the present application, "axial direction" generally refers to the axial direction of the electric machine, i.e. the direction of extension along the axis of rotation of the electric machine.
As shown in fig. 1, 5 and 6, one embodiment of the present invention is a permanent magnet brushless dc motor including a housing 1, a stator core 2, a rotor core 3, a permanent magnet 4, a shaft 5, a winding 6 and an insulating frame 7. The stator iron core 2 is arranged along the circumferential direction of the inner wall of the shell 1, and the rotor iron core 3 is arranged in a space surrounded by the stator iron core 2; the rotor core 3 includes at least two full-bridge type lamination groups 31 and at least one half-bridge type lamination group 32, wherein the lamination in the full-bridge type lamination group 31 includes a plurality of full-bridge lamination sheets 311 which are connected with the first central connecting bridge H1 and distributed along the circumferential direction, the lamination in the half-bridge type lamination group 32 includes at least one separation lamination sheet 322 which is disconnected with the second central connecting bridge H2 and distributed along the circumferential direction, and the full-bridge type lamination group 31 and the half-bridge type lamination group 32 are stacked axially such that each half-bridge type lamination group 32 is located between two full-bridge type lamination groups 31, so that adjacent sectors in the same lamination layer of the full-bridge type lamination group 31 are asymmetric, permanent magnets 4 are placed in slots between the adjacent sectors, and the polarities of the adjacent two permanent magnets 4 are different, thereby forming the interior permanent magnet motor. Adjacent sectors in the same laminated layer of the half-bridge type lamination group 32 are asymmetric, permanent magnets 4 are placed in the grooves between the adjacent sectors, the polarities of the permanent magnets 4 in the adjacent two grooves are different, corresponding half-bridge stamped sheets 321 in the grooves extend outwards along the radial direction to form radial groove bottom protrusions, the radial groove bottom protrusions are separated from the permanent magnets 4, and the distance between the outermost side of each radial groove bottom protrusion and each permanent magnet 4 is larger than 0.5 mm.
As shown in fig. 15 and 16, the fully bridged lamination stack 31 includes a plurality of fully bridged laminations, and adjacent fully bridged laminations are overlapped; half-bridge lamination stack 32 includes a plurality of half-bridge laminations, with adjacent half-bridge laminations being stacked in registration.
As shown in fig. 3 and 4, the stator core 2 is formed by enclosing 12T-shaped tooth connecting yokes 21, the stator core 2 and the casing 1 are in contact through the connecting points between the adjacent T-shaped tooth connecting yokes 21, the contact portion forms a contact area 22, the outer surface or the top surface of the yoke portion 211 of each T-shaped tooth connecting yoke 21 is a plane, a gap between the yoke portion and the inner wall of the circular casing 1 forms a filling area 23, and the filling area 23 can be filled with a plurality of materials. The winding 6 adopts flying fork winding, and the designed stator slot type can effectively avoid the interference of flying fork winding and improve the mass production efficiency.
As shown in fig. 3, the outer surface of the yoke portion 211 of the T-shaped tooth yoke 21 is parallel to the stator slot bottom 2111, the T-shaped tooth yoke 21 is provided with two riveting points with different sizes, the outer riveting point 213 is larger than the inner riveting point 214 in size, in this embodiment, the diameter of the outer riveting point 213 is 1.2mm, and the diameter of the inner riveting point 214 is 1.0 mm; the outer riveting point 213 is arranged at the center of the yoke 211, and the inner riveting point 214 is arranged in the middle of the tooth crown of the tooth part 212; in the present embodiment, as shown in fig. 11, the theoretical winding slot area of the stator core 2 is increased by 8.5% compared with the winding slot area of the conventional circular stator core stamped piece shown in fig. 12, in comparison with the winding slot area of the conventional circular stator core stamped piece shown in fig. 12, in which the crown shape of the tooth portion 212 is a sloping surface, an included angle between an inner slope of the sloping-shoulder crown slot 2121 and a radial boundary of the tooth portion 212 is an obtuse angle, preferably 120 °, the tooth portion 212 is perpendicular to an outer surface of the yoke portion 211 or a stator slot bottom 2111, a slope of a straight line segment of the sloping-shoulder crown slot 2121 is 30 °, a width of a narrowest point of the tooth portion 212 is 5.2mm, and a height of the yoke portion 211 is 3.5 mm. The bending point 2112 mainly functions to release stress for the stator core 2 to perform rounding.
As shown in fig. 2, 15 and 16, in the present embodiment, the rotor core 3 includes two full-bridge type lamination sets 31 and one half-bridge type lamination set 32, and the half-bridge type lamination set 32 is located between the two full-bridge type lamination sets 31 in the axial stacking manner, that is, the two full-bridge type lamination sets 31 are respectively located at two ends of the rotor core 3, and the half-bridge type lamination set 32 is located in the middle of the rotor core 3, so that the structure of the rotor core can make adjacent sectors asymmetrical, thereby greatly reducing the self-interlinkage magnetic leakage of the permanent magnet slot bottom at the near axis to improve the power density.
The half-bridge type lamination group 32 is formed by stacking a plurality of half-bridge type laminations as shown in fig. 5, each half-bridge type lamination comprises a plurality of half-bridge punching sheets 321 and a plurality of separation punching sheets 322, a separation punching sheet 322 is arranged between every two adjacent half-bridge punching sheets 321, and the separation punching sheets 322 are not in contact with the half-bridge punching sheets 321; a partition type supporting bridge 323 is arranged between every two half-bridge punching sheets 321; the half-bridge punching sheet 321 is provided with a narrow magnetic bridge 325, the first central connecting bridge H1 is provided with an isolating wide magnetic bridge 324, and the width of the isolating wide magnetic bridge 324 is greater than that of the narrow magnetic bridge 325.
The full bridge type lamination stack 31 is formed by stacking full bridge type laminations as shown in fig. 6, and the full bridge type laminations comprise a plurality of full bridge stamped sheets 311 with supporting bridges 312 between adjacent sheets; one of two adjacent full bridge stamped sheets 311 protrudes outwards in the radial direction to form a wide magnetic bridge 313, the other protrudes outwards in the radial direction to form a narrow magnetic bridge 314, the width of the wide magnetic bridge 313 is greater than that of the narrow magnetic bridge 314, the full bridge laminated sheets are provided with plastic-coated through holes 3112 in the axial direction, the half bridge laminated sheets are provided with plastic-coated through holes 3212 in the axial direction, the rotor core 3 is wrapped and reinforced by plastic materials through the plastic-coated through holes 3112 and 3212 and are positioned and connected through riveting points 3113, 3213 and 3223, the distance between the edge of the through hole of the stamped sheet and the boundary of the adjacent permanent magnet slot is 2.6mm, the axial stacking structure is A + B + A, the ratio of the number of the full bridge laminated sheets in the full bridge laminated sheet group 31 to the number of the half bridge laminated sheets in one half bridge laminated sheet group 32 is less than 0.5, if one group of the full bridge laminated sheets 31 comprises 10 full bridge laminated sheets, and one group of the half bridge laminated sheets 32 comprises 30 half bridge laminated sheets, the back emf coefficient of the motor of this embodiment is improved by 34.4% compared to a motor in which the rotor is formed entirely of half-bridge laminations.
As shown in fig. 6, the full bridge type lamination is a full bridge type structure, wherein 10 full bridge stampings 311 included therein are connected into a whole through a first central connecting bridge H1, the first central connecting bridge H1 includes a plurality of supporting bridges 312, a plurality of wide magnetic bridges 313 and a plurality of narrow magnetic bridges 314, and the first central connecting bridge H1 is a continuous whole. The thickness of the permanent magnet 4 selected in the embodiment is 5mm, the width of the narrow magnetic bridge 314 is 0.8mm, the width of the wide magnetic bridge 313 is 1.5mm, the length of the magnetic bridge is 2.8mm, and the width of the supporting bridge 312 is 1.2 mm. The support bridge 312 is contacted with the permanent magnet 4, the support bridge 312 is overlapped with the radial groove bottom protrusion along the axial direction, and the widths of the support bridge 312 and the radial groove bottom protrusion on the side of the shaft sleeve are equal.
As shown in fig. 5, the half-bridge type lamination is a half-bridge type structure, wherein the included 5 separation punching sheets 322 are all disconnected from the second central connection bridge H2, that is, the 5 separation punching sheets 322 are not connected to the second central connection bridge H2, and are in a separated state from the second central connection bridge H2, the second central connection bridge H2 includes a plurality of partitioned support bridges 323, a plurality of partitioned wide magnetic bridges 324, and a plurality of narrow magnetic bridges 325, and the second central connection bridge H2 is a continuous whole. Of course, the number of the separating sheets 322 is not limited to 5, and may be 1 to 4, or may be other numbers. The width of the narrow magnetic bridge 325 is 0.8mm, the distance between the partition type supporting bridge 323 and the permanent magnet 4 is 2.5mm, through optimization of the parameters, the magnetic leakage of the bottom of the permanent magnet groove at the position close to the axis of the rotor core 3 is greatly reduced, other parameters are guaranteed to be unchanged, the bottom of the groove of the motor with the three structures of the full-bridge connection type rotor structure, the non-partition supporting bridge type structure and the magnetic field distribution of the embodiment are respectively compared, and the magnetic leakage coefficient of the self-cross-link groove is calculated, and referring to fig. 10, the bottom of the groove of the motor with the three structures of the full-bridge connection type A, the non-partition supporting bridge type B and the mixed bridge type C can be respectively 0.207, 0.065 and 0.018, and the bottom of the groove of the motor can be greatly reduced, so that the power density of the motor is greatly improved.
As shown in fig. 5, 6 and 13, the outer arc surfaces of the full-bridge lamination and the half-bridge lamination both adopt five-segment spline structures to reduce torque fluctuation and improve motor vibration noise, and each rotor sector adopts the structure, namely, a central angle α of an arc segment main spline D concentric with the stator in the middle, two eccentric arc line splines E with central angles β 1 left and right adjacent to the arc segment main spline D and a straight-line segment spline F with central angles β 2 in the two edge segments should satisfy α +2 β 1+2 β 2 being 36 °.
By comparing and analyzing the rotor with the full-circle structure, the rotor with the traditional three-segment arc structure and the 5-segment spline rotor in the embodiment, the optimized no-load back electromotive force distortion rate is only 1.18%, and corresponding harmonic components are shown in fig. 14. In the embodiment, bulk molding compound is adopted to perform plastic coating and shaping on the rotor surface, and the maximum structural failure rotating speed of the motor is 19000rpm which is more than 6 times of the actual operating rotating speed of the motor, so that the rotor surface structural design of the embodiment can ensure the high sine property and the sufficient structural strength of the air gap magnetic field.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (18)
1. A permanent magnet motor comprises a shell, a stator core, a rotor core and a permanent magnet; the rotor core is arranged in a space surrounded by the stator core; it is characterized in that the preparation method is characterized in that,
the rotor core comprises at least two full bridge type lamination groups and at least one half bridge type lamination group, wherein the lamination in the full bridge type lamination group comprises a first central connecting bridge and a plurality of full bridge type lamination sheets which are connected with the first central connecting bridge and distributed along the circumferential direction, the first central connecting bridge is provided with a supporting bridge, and the supporting bridge is positioned between the adjacent full bridge type lamination sheets; the lamination in half bridge formula lamination group includes that the second center connects the bridge, connects the bridge with the second center and all is connected and along a plurality of half bridge punching pieces that circumference distributes to and be connected the bridge disconnection with the second center and follow a plurality of separation punching pieces that circumference distributes, adjacent two be equipped with one between the half bridge punching piece the separation punching piece, the second center is connected the bridge and is had the wall formula supporting bridge, the wall formula supporting bridge is located adjacently half bridge punching piece with between the separation punching piece, the wall formula supporting bridge with the permanent magnet separates, the supporting bridge with the permanent magnet contact.
2. The permanent magnet electric machine of claim 1 wherein the fully bridged lamination stack and the semi-bridged lamination stack are stacked axially with each semi-bridged lamination stack between two of the fully bridged lamination stacks such that adjacent sectors in the same lamination stack of the fully bridged lamination stack are asymmetric, adjacent sectors in the same lamination stack of the semi-bridged lamination stack are asymmetric, and the permanent magnets are disposed in slots between adjacent sectors.
3. The permanent magnet electric machine of claim 2 wherein the support bridge is partially axially coincident with the partitioned support bridge; the width of the support bridge and the width of the partition type support bridge on the side of the shaft sleeve are equal.
4. The permanent magnet electric machine of claim 2, wherein the full bridge laminations have a first narrow magnetic bridge having a width less than a width of the support bridge.
5. The permanent magnet motor according to claim 2, wherein a distance between the partitioned support bridge and the permanent magnet is smaller than a length of a magnetic bridge of the full bridge punching sheet.
6. The permanent magnet machine of claim 2 wherein the distance between the outermost side of the partitioned support bridge and the permanent magnet is greater than 0.5 mm.
7. The permanent magnet electric machine of claim 1 wherein the ratio of the number of fully-bridged laminations in one fully-bridged lamination stack to the number of half-bridged laminations in one half-bridged lamination stack is less than 0.5.
8. The permanent magnet motor according to claim 1, wherein one of two adjacent full bridge laminations protrudes outward in the radial direction to form a wide magnetic bridge, and the other protrudes outward in the radial direction to form a first narrow magnetic bridge, and the width of the wide magnetic bridge is greater than that of the first narrow magnetic bridge.
9. The permanent magnet motor of claim 1, wherein the separator laminations are not in contact with the half-bridge laminations; the half-bridge punching sheet is provided with a second narrow magnetic bridge, an isolating type wide magnetic bridge is arranged on the second center connecting bridge, and the width of the isolating type wide magnetic bridge is larger than that of the second narrow magnetic bridge.
10. The permanent magnet electric machine of claim 1 wherein the second central connecting bridge extends radially outward to form a second narrow magnetic bridge within at least one lamination layer of the half-bridged lamination stack.
11. The permanent magnet motor of claim 1, wherein the contact point of the stator core and the casing forms a contact area, and the gap where the stator core and the casing are not in contact forms a filling area by injecting a filling material.
12. The permanent magnet electric machine of claim 1 wherein said stator core includes a plurality of T-tooth yokes, each said T-tooth yoke being enclosed along an inner wall of said housing.
13. The permanent magnet motor according to claim 12, wherein the number of the T-shaped tooth connecting yokes is 12, so that the outer boundary of the stator core is in a regular dodecagon shape;
the outer surface of each T-shaped tooth connecting yoke is parallel to the bottom of the stator slot, the tooth parts of the T-shaped tooth connecting yokes are perpendicular to the boundary surface of the yoke parts, and the number of the T-shaped tooth connecting yokes is equal to the number of the motor slots.
14. The permanent magnet motor according to claim 13, wherein each T-shaped tooth yoke is provided with two riveting points having different sizes, an outer one having a diameter larger than that of an inner one; the outer riveting point is arranged at the center of the yoke, and the inner riveting point is arranged in the middle of a tooth crown of the tooth part.
15. The permanent magnet electric machine of claim 13 wherein said tooth crown is shaped as a shoulder and forms a shoulder crown slot, the inner slope of said shoulder crown slot being at an obtuse angle to the radial boundary of said tooth.
16. The permanent magnet motor of claim 1, wherein the outer arc surfaces of each of the half-bridge laminations and each of the split laminations comprise a plurality of sections of splines;
the splines at least comprise main splines of the circular arc section and straight-line splines which are respectively arranged on two sides of the main splines of the circular arc section.
17. The permanent magnet electric machine of claim 16 wherein the number of segments x of the spline satisfies:
if LCM (2P, S)/2P is odd, then x ═ LCM (2P, S)/2P ];
if LCM (2P, S)/2P is an even number, then x ═ LCM (2P, S)/2P ] -1;
wherein, x, LCM, P and S are the number of spline segments, the least common multiple, the pole pair number and the number of grooves respectively.
18. The permanent magnet motor according to claim 17, wherein if the circle center degree of the main spline of the circular arc segment is α, and the circle center angles of the remaining spline segments are β i, then the following conditions are satisfied:
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018105919928 | 2018-05-31 | ||
| CN201810591992.8A CN108923560A (en) | 2018-05-31 | 2018-05-31 | A kind of interior permanent magnet machines |
| CN201811459944.XA CN110556947A (en) | 2018-05-31 | 2018-11-30 | Built-in permanent magnet motor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811459944.XA Division CN110556947A (en) | 2018-05-31 | 2018-11-30 | Built-in permanent magnet motor |
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| Publication Number | Publication Date |
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| CN113346652A true CN113346652A (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810591992.8A Pending CN108923560A (en) | 2018-05-31 | 2018-05-31 | A kind of interior permanent magnet machines |
| CN202110807671.9A Pending CN113364183A (en) | 2018-05-31 | 2018-11-30 | Permanent magnet motor |
| CN201811459944.XA Pending CN110556947A (en) | 2018-05-31 | 2018-11-30 | Built-in permanent magnet motor |
| CN202110809037.9A Pending CN113346652A (en) | 2018-05-31 | 2018-11-30 | Permanent magnet motor |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810591992.8A Pending CN108923560A (en) | 2018-05-31 | 2018-05-31 | A kind of interior permanent magnet machines |
| CN202110807671.9A Pending CN113364183A (en) | 2018-05-31 | 2018-11-30 | Permanent magnet motor |
| CN201811459944.XA Pending CN110556947A (en) | 2018-05-31 | 2018-11-30 | Built-in permanent magnet motor |
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| Country | Link |
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| CN (4) | CN108923560A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112564344B (en) * | 2019-09-26 | 2022-05-17 | 广东威灵电机制造有限公司 | Rotor and motor |
| CN112564350B (en) * | 2019-09-26 | 2022-04-01 | 广东威灵电机制造有限公司 | Motor, household appliance and manufacturing method of motor |
| CN111725923B (en) * | 2020-07-27 | 2021-07-02 | 威灵（芜湖）电机制造有限公司 | Motor and household appliance |
| CN112421924B (en) * | 2020-11-09 | 2021-09-10 | 广东威灵电机制造有限公司 | Motor and household appliance |
| CN112421905B (en) * | 2020-12-18 | 2022-06-21 | 山东理工大学 | Production method of radial-crossed block-type salient pole rotor for driving motor |
| CN114465381A (en) * | 2022-01-21 | 2022-05-10 | 华为数字能源技术有限公司 | Rotor and electric excitation synchronous motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20130027417A (en) * | 2011-09-07 | 2013-03-15 | 삼성전자주식회사 | Motor and washing machine having the same |
| CN105024469A (en) * | 2015-08-19 | 2015-11-04 | 广东威灵电机制造有限公司 | Rotor iron core, rotor and motor |
| CN105099012A (en) * | 2015-09-17 | 2015-11-25 | 上海电机系统节能工程技术研究中心有限公司 | High-performance permanent magnet servo motor |
| CN205377492U (en) * | 2015-12-31 | 2016-07-06 | 卧龙电气集团股份有限公司 | Direct current permanent -magnet machine rotor core |
| US10389196B2 (en) * | 2016-03-31 | 2019-08-20 | Nidec Motor Corporation | Spoked rotor with tapered pole segments and tapered ear recesses |
| CN106712348A (en) * | 2016-12-27 | 2017-05-24 | 威灵（芜湖）电机制造有限公司 | Rotor core, rotor and motor with same |
| CN113691041A (en) * | 2017-11-01 | 2021-11-23 | 莱克电气股份有限公司 | Rotor core |
| CN107834730A (en) * | 2017-11-01 | 2018-03-23 | 莱克电气股份有限公司 | Embedded permanent magnet synchronous motor rotor core |
| CN108923553A (en) * | 2018-05-31 | 2018-11-30 | 广东威灵电机制造有限公司 | A kind of high power density permanent magnet motor |
-
2018
- 2018-05-31 CN CN201810591992.8A patent/CN108923560A/en active Pending
- 2018-11-30 CN CN202110807671.9A patent/CN113364183A/en active Pending
- 2018-11-30 CN CN201811459944.XA patent/CN110556947A/en active Pending
- 2018-11-30 CN CN202110809037.9A patent/CN113346652A/en active Pending
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|---|---|
| CN110556947A (en) | 2019-12-10 |
| CN108923560A (en) | 2018-11-30 |
| CN113364183A (en) | 2021-09-07 |
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