CN113691041A - Rotor core - Google Patents
Rotor core Download PDFInfo
- Publication number
- CN113691041A CN113691041A CN202110900296.2A CN202110900296A CN113691041A CN 113691041 A CN113691041 A CN 113691041A CN 202110900296 A CN202110900296 A CN 202110900296A CN 113691041 A CN113691041 A CN 113691041A
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- Prior art keywords
- permanent magnet
- punching sheet
- groove
- rotor
- rotor punching
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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
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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
- 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
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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 present invention relates to a rotor core, comprising: the closed rotor punching sheet group comprises a plurality of closed rotor punching sheets which are sequentially stacked along the axial direction, each closed rotor punching sheet comprises a closed punching sheet body, a first inner magnetism isolating groove is formed at the inner end of a first permanent magnet groove, and an inner abutting end protruding outwards along the radial direction is formed on the radial end face of the first inner magnetism isolating groove; the closed rotor punching sheet group and the open rotor punching sheet group are alternately stacked in the axial direction, the open rotor punching sheet group comprises a plurality of open rotor punching sheets which are sequentially stacked in the axial direction, the open rotor punching sheet comprises an open punching sheet body, a second inner magnetic isolation groove is formed at the inner end of the second permanent magnet groove, and a groove which is recessed inwards in the radial direction is formed on the radial end face of the second inner magnetic isolation groove. The rotor core can improve the output capacity of the rotor and further enhance the structural stability of the rotor.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor core.
Background
The motor is an electromagnetic device for realizing electric energy conversion or transmission according to the electromagnetic induction law, and mainly has the function of generating driving torque as a power source of electric appliances or various machines. Motors can be classified into dc motors, asynchronous motors, and synchronous motors according to their structures and operating principles, and the synchronous motors generally include permanent magnet synchronous motors, reluctance synchronous motors, and tape synchronous motors. At present, the radial outer side of a permanent magnet groove of an embedded permanent magnet in the market has two structures, one is open, and the other is totally closed or closed. Generally, an open rotor has a high maximum output under the same conditions, but has a low strength, an iron core is easily deformed during transportation, and the rotor has poor structural stability during high-speed operation and generates a large noise; the closed rotor structure has good stability and low noise, but has poor output capability.
Disclosure of Invention
Based on the structure, the rotor core provided by the invention can improve the output capacity of the rotor, can further enhance the structural stability of the rotor, gives consideration to the advantages of the open rotor and the closed rotor, and avoids the respective defects of the two rotors.
A rotor core comprising:
the closed type rotor punching sheet comprises a closed type punching sheet body, a plurality of first permanent magnet grooves are formed in the closed type punching sheet body, the first permanent magnet grooves are radially arranged in the circumferential direction of the closed type punching sheet body, a first inner magnetism isolating groove is formed in the inner end of each first permanent magnet groove, and an inner abutting end protruding outwards in the radial direction is formed on the radial end face of each first inner magnetism isolating groove;
the closed rotor punching sheet group and the open rotor punching sheet group are alternately stacked along the axial direction, the open rotor punching sheet group comprises a plurality of open rotor punching sheets which are sequentially stacked along the axial direction, the open rotor punching sheet comprises an open punching sheet body, a plurality of second permanent magnet grooves are formed in the open punching sheet body, the second permanent magnet grooves are radially arranged on the periphery of the open punching sheet body, second inner magnet separating grooves are formed in the inner ends of the second permanent magnet grooves, grooves which are recessed along the radial inner side are formed in the radial end face of each second inner magnet separating groove, and the first permanent magnet grooves and the second permanent magnet grooves are mutually communicated to form permanent magnet mounting grooves for mounting permanent magnets.
In one embodiment, a first through hole is formed in the rotation center of the closed type stamped steel body, a first magnetic pole between two adjacent first permanent magnet grooves is limited, a first inner magnetic isolation bridge is formed between the inner end of each first permanent magnet groove and the corresponding first through hole, an outer magnetic isolation bridge is formed between the outer end of each first permanent magnet groove and the outer periphery of the closed type stamped steel body, and a plurality of closed type rotor stamped steel are combined into a rigid whole.
In one embodiment, a second through hole is formed in the rotation center of the open type punching sheet body, a second magnetic pole between two adjacent second permanent magnet slots is defined, a second inner magnetic isolation bridge is formed between the inner end of each second permanent magnet slot and the corresponding second through hole, the outer end of each second permanent magnet slot is communicated with a magnetic isolation passage leading to the outside, and a plurality of open type rotor punching sheets are combined into a rigid whole.
In one embodiment, the first permanent magnet slot and the second permanent magnet slot are arranged in a trapezoidal structure, and the width dimension of the first permanent magnet slot in the circumferential direction and the width dimension of the second permanent magnet slot in the circumferential direction are gradually reduced while the radii of the first permanent magnet slot and the second permanent magnet slot are increased.
In one embodiment, the ratio of the circumferential width of the inner end of the first permanent magnet slot to the circumferential width of the outer end of the first permanent magnet slot is 1: 0.85.
In one embodiment, the number of groups of the closed rotor punching sheet groups is a, the number of groups of the open rotor punching sheet groups is b, the number of closed rotor punching sheets in each group of the closed rotor punching sheet groups is x, the number of open rotor punching sheets in each group of the open rotor punching sheet groups is y, and then a is greater than or equal to 1, b is greater than or equal to 1, x is 1, and y is 4.
In one embodiment, the rotor core clamps one closed rotor punching sheet group among a plurality of open rotor punching sheet groups.
In one embodiment, a width dimension of the first inner magnetism partition groove in the circumferential direction is larger than a width dimension of the first permanent magnet groove in the circumferential direction, and a width dimension of the second inner magnetism partition groove in the circumferential direction is larger than a width dimension of the second permanent magnet groove in the circumferential direction.
In one embodiment, at least one first shoulder is formed on a circumferential end surface of the first permanent magnet slot; and at least one second shoulder is formed on the circumferential end surface of the second permanent magnet slot.
In one embodiment, the first shoulder part protrudes along the inner side of the first permanent magnet groove to form a right angle, so that a first outer magnetism isolating groove is formed at the outer end of the first permanent magnet groove; the second shoulder part protrudes along the inner side of the second permanent magnet groove to form a right angle, so that a second outer magnetism isolating groove is formed at the outer end of the second permanent magnet groove.
The rotor core is communicated with the second permanent magnet groove through the first permanent magnet groove to form a permanent magnet mounting groove, and the permanent magnet mounting groove can circumferentially hold the permanent magnet mounted in the permanent magnet mounting groove tightly to limit the displacement of the permanent magnet in the permanent magnet mounting groove; meanwhile, the inner side end face of the permanent magnet arranged in the permanent magnet mounting groove is tightly jacked through the inner jacking end in the closed rotor punching sheet, so that the permanent magnet is further limited, the structural stability of the rotor is enhanced, and the noise generated when the rotor runs at a high speed is small. The arrangement of the first inner magnetic isolation groove and the second inner magnetic isolation groove can be used as inner magnetic flux barriers, the leakage of magnetic flux on the radial inner end can be reduced, and the energy conversion efficiency and the output capacity of the rotor are improved; meanwhile, a groove which is sunken along the radial inner side is formed in the radial end face of the second inner magnetic isolation groove of the open type punching sheet body, and the volume of the second inner magnetic isolation groove can be enlarged by arranging the groove, so that the magnetic isolation capacity is improved, the magnetic flux leakage is further reduced, and the rotor output capacity is improved. Therefore, the advantages of the open type rotor and the closed type rotor can be taken into consideration, and the respective defects of the two rotors can be avoided.
Drawings
Fig. 1 is a perspective view of a rotor core according to an embodiment of the present invention;
FIG. 2 is a top plan view of a closed rotor plate of the rotor core of FIG. 1;
fig. 3 is a plan view of an open-type rotor segment of the rotor core of fig. 1.
Reference numerals:
a rotor core 11;
the closed rotor punching sheet 11, a first through hole 111, a first permanent magnet groove 112, a first shoulder 1121, a first inner magnetic isolation bridge 113, a first magnetic pole 114, an outer magnetic isolation bridge 115, a first outer magnetic isolation groove 116, a first inner magnetic isolation groove 117, an inner abutting end 1171 and a closed punching sheet body 118;
the open-type rotor punching sheet 12, the second through hole 121, the second permanent magnet groove 122, the second shoulder 1221, the second inner magnetic isolation bridge 123, the second magnetic pole 124, the magnetic isolation passage 125, the second outer magnetic isolation groove 126, the second inner magnetic isolation groove 127, the groove 1271 and the open-type punching sheet body 128;
and a magnetism isolating through hole 13.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1 to 3, fig. 1 is a perspective view of a rotor core according to an embodiment of the present invention, fig. 2 is a top view of a closed rotor sheet of the rotor core shown in fig. 1, and fig. 3 is a top view of an open rotor sheet of the rotor core shown in fig. 1. The rotor core provided by one embodiment of the invention comprises at least one closed rotor punching sheet group and at least one open rotor punching sheet group, wherein the closed rotor punching sheet groups and the open rotor punching sheet groups are alternately stacked along the axial direction, and the axial direction refers to the axial direction of the rotor rotating shaft. The closed type rotor punching sheet group comprises a plurality of closed type rotor punching sheets 11 which are sequentially stacked along the axial direction, each closed type rotor punching sheet 11 comprises a closed type punching sheet body 118, a plurality of first permanent magnet grooves 112 are formed in the closed type punching sheet body 118, the plurality of first permanent magnet grooves 112 are radially arranged on the circumference of the closed type punching sheet body 118, and namely the plurality of first permanent magnet grooves 112 are arranged along the circumferential direction of the closed type punching sheet body 118. The inner end of each first permanent magnet slot 112 is formed with a first inner magnetism-isolating slot 117, and an inner tip 1171 that protrudes radially outward is formed on a radial end surface of the first inner magnetism-isolating slot 117, that is, the inner tip 1171 protrudes from the radial end surface of the first inner magnetism-isolating slot 117 toward the direction of the first permanent magnet slot 112. Similarly, the open type rotor punching sheet group comprises a plurality of open type rotor punching sheets 12 which are sequentially stacked along the axial direction, each open type rotor punching sheet 12 comprises an open type punching sheet body 128, a plurality of second permanent magnet grooves 122 are formed in the open type punching sheet body 128, the plurality of second permanent magnet grooves 122 are radially arranged in the circumferential direction of the open type punching sheet body 128, namely the plurality of second permanent magnet grooves 122 are arranged in the circumferential direction of the open type punching sheet body 128. The inner end of each second permanent magnet slot 122 is formed with a second inner magnetism-isolating slot 127, and a groove 1271 that is recessed inward in the radial direction is formed on the radial end face of the second inner magnetism-isolating slot 127. After the closed rotor punching sheet group and the open rotor punching sheet group are assembled, the first permanent magnet groove 112 and the second permanent magnet groove 122 are communicated with each other to form a permanent magnet mounting groove for mounting permanent magnets.
In the rotor core in this embodiment, the first permanent magnet slot 112 is communicated with the second permanent magnet slot 122 to form a permanent magnet mounting slot, and the slot wall of the permanent magnet mounting slot can circumferentially hold the permanent magnet mounted therein tightly, so as to limit the displacement of the permanent magnet in the permanent magnet mounting slot. Meanwhile, in the embodiment, an inner abutting end 1171 protruding radially outwards is formed on the radial end face of the first inner magnetism isolating groove 117 on the closed type stamping sheet body 118, a groove 1271 recessed radially inwards is formed on the radial end face of the second inner magnetism isolating groove 127 of the open type stamping sheet body 128, and a structure similar to the inner abutting end 1171 is not provided, so that only part of the stamped sheets in the finally assembled rotor core have the inner abutting end 1171, and part of the stamped sheets do not exist, and thus, the arrangement can ensure that a sufficient space is provided for the inner abutting end 1171 to deform. This interior tight end 1171 in top can push up tightly the radial medial surface of the permanent magnet of installing in the permanent magnet mounting groove for the permanent magnet can obtain abundant support in the inner of permanent magnet mounting groove, interior tight end 1171 in top carries out further spacingly with the cell wall of permanent magnet mounting groove to the permanent magnet jointly, thereby strengthens the structural stability of rotor, makes the rotor difficult the taking place to rock in the permanent magnet mounting groove when high-speed operation, thereby noise reduction. In addition, the first inner magnetic isolation groove 117 and the second inner magnetic isolation groove 127 are arranged to form inner magnetic flux barriers, so that leakage of magnetic flux on the radial inner end can be reduced, and energy conversion efficiency and rotor output capacity are improved; meanwhile, a groove 1271 which is recessed towards the radial inner side is formed on the radial end face of the second inner magnetism isolation groove 127 of the open type punching sheet body 128, and the volume of the second inner magnetism isolation groove 127 can be enlarged by arranging the groove 1271, so that the magnetism isolation capability is improved, the magnetic flux leakage is further reduced, and the rotor output capability is improved. In summary, in the rotor core in this embodiment, the open-type rotor punching sheet and the closed-type rotor punching sheet are combined, so that magnetic flux leakage can be reduced as much as possible on the premise of ensuring good structural stability, the advantages of the open-type rotor and the closed-type rotor are taken into consideration, and the respective defects of the two rotors are avoided as much as possible.
In some embodiments, the open rotor lamination 12 and the closed rotor lamination 11 are generally made of silicon steel sheets or silicon steel sheets.
In some embodiments, a first through hole 111 is provided at the rotation center of the closed punching sheet body 118, and a first inner magnetic isolation bridge 113 is formed between the inner end of the first permanent magnet slot 112 and the first through hole 111. The first inner magnetic isolation bridge 113 is annular, and the plurality of first permanent magnet slots 112 are uniformly distributed on the periphery of the first inner magnetic isolation bridge 113. An outer magnetic isolation bridge 115 is formed between the outer end of the first permanent magnet groove 112 and the outer periphery of the closed punching sheet body 118. Two adjacent first permanent magnet slots 112 define a first magnetic pole 114 located between the two first permanent magnet slots, the first magnetic pole 114 is in a fan shape, the plurality of first magnetic poles 114 are uniformly distributed on the periphery of the first inner magnetic isolation bridge 113, and the plurality of first magnetic poles 114 are connected with the first inner magnetic isolation bridge 113 into a whole. The closed rotor punching sheets 11 are combined into a rigid whole. As can be seen from the figure, the radial inside end surface of the first permanent magnet slot 112 is the radial outside end surface of the first inner magnetic isolation bridge 113, and the inner fastening end 1171 protrudes outward from the radial outside end surface of the first inner magnetic isolation bridge 113.
In some embodiments, a second through hole 121 is disposed at a rotation center of the open punching sheet body 128, and a second inner magnetic isolation bridge 123 is formed between an inner end of the second permanent magnet slot 122 and the second through hole 121. The second inner magnetic isolation bridge 123 is annular, and the plurality of second permanent magnet slots 122 are uniformly distributed on the periphery of the second inner magnetic isolation bridge 123. The outer end of the second permanent magnet slot 122 is communicated with a magnetic isolation passage 125 leading to the outside. Two adjacent second permanent magnet grooves 122 define a second magnetic pole 124 located therebetween, the second magnetic pole 124 is fan-shaped, the plurality of second magnetic poles 124 are uniformly distributed on the periphery of the second inner magnetic isolation bridge 123, and the plurality of second magnetic poles 124 are connected with the second inner magnetic isolation bridge 123 into a whole. A plurality of open rotor sheets 12 are combined into a rigid whole. As can be seen from the figure, the radially inner end surface of the second permanent magnet slot 122 is the radially outer end surface of the second inner magnetic isolation bridge 123, and the groove 1271 is recessed inward from the radially outer end surface of the second inner magnetic isolation bridge 123.
The closed rotor punching sheet groups and the open rotor punching sheet groups are alternately combined into a rigid whole in the axial direction, so that the first through hole 111 and the second through hole 121 are communicated with each other to form a rotating shaft through hole for mounting a rotating shaft. Rotor core is at the pivoting in-process, and first interior magnetic bridge 113, second interior magnetic bridge 123 and interior top tight end 1171 can restrict the permanent magnet to the inside drunkenness of footpath, and outer magnetic bridge 115 can restrict the permanent magnet to the play of footpath outside to reinforcing rotor core's structural stability makes it more stable when rotating, and the noise of production is littleer. And the magnetic isolation path 125 at the outer end of the second permanent magnet slot 122 becomes a magnetic flux barrier between the permanent magnet and the outside, which can prevent the leakage of magnetic flux, thereby improving the maximum output power, i.e. the output capacity of the rotor. To sum up, the inner top fastening end 1171, the first inner magnetic isolation bridge 113, the second inner magnetic isolation bridge 123, the outer magnetic isolation bridge 115 and the groove walls of the permanent magnet installation groove jointly fasten and fix the permanent magnet, so that the structural stability of the rotor is improved; meanwhile, the output capacity of the rotor is improved through the magnetism isolating passage 125, so that the advantages of the two rotors are taken into consideration, and the defects of the two rotors are avoided as much as possible.
Preferably, the number of the first permanent magnet slots 112 and the number of the second permanent magnet slots 122 are respectively and uniformly set in the circumferential direction to 8, and accordingly, the number of the first magnetic poles 114 and the number of the second magnetic poles 124 are respectively and uniformly set in the circumferential direction to 8.
Typically, the permanent magnet slots are arranged in a radially extending rectangular configuration, and correspondingly, the permanent magnets are also arranged in a rectangular configuration to accommodate them. Preferably, in some embodiments, the first permanent magnet slot 112 and the second permanent magnet slot 122 are arranged in a trapezoidal structure, and the size of the two permanent magnet slots is the same, and the permanent magnet mounting slot formed by the two permanent magnet slots communicating with each other is also in a trapezoidal structure, and accordingly, the permanent magnet is also arranged in a trapezoidal structure corresponding to the trapezoidal structure. The width of the first permanent magnet groove 112 in the circumferential direction and the width of the second permanent magnet groove 122 in the circumferential direction are gradually reduced while increasing in radius. The design that the inner tightening end 1171 is tightly matched with the trapezoidal permanent magnet mounting groove enables the permanent magnet to be fully supported in the permanent magnet mounting groove, and the inner tightening end 1171 can be guaranteed to have good fixing and limiting effects even if only part of the rotor punching sheets (the closed type rotor punching sheets 11) are provided with the inner tightening end 1171. When the rotor rotates, the permanent magnet is gradually held tightly by the circumferential end face of the trapezoidal permanent magnet mounting groove under the action of centrifugal force, so that the inner and outer radial play of the permanent magnet is prevented, and the rotational stability of a rotor iron core is further ensured.
It can be understood that, the ratio of the circumferential width of the inner end of the first permanent magnet slot 112 to the circumferential width of the outer end of the first permanent magnet slot 112 is too small, i.e. close to the conventional rectangular structure, the holding degree may not satisfy the expected effect; if this ratio setting is too big, outer end circumference width is as little as possible promptly, and inner circumference width is as big as possible, probably leads to the regional space utilization in outer end lower to inner magnetic leakage is more. Therefore, preferably, in some embodiments, the ratio of the inner end circumferential width of the first permanent magnet slot 112 to the outer end circumferential width of the first permanent magnet slot 112 is 1: 0.85.
In some embodiments, the width dimension of the first inner magnetism-insulating groove 117 in the circumferential direction is larger than the width dimension of the first permanent magnet groove 112 in the circumferential direction, and the width dimension of the second inner magnetism-insulating groove 127 in the circumferential direction is larger than the width dimension of the second permanent magnet groove 122 in the circumferential direction. The distance between the two adjacent permanent magnets at the inner end can be increased by the arrangement, so that the mutual influence and interference of magnetic fluxes generated by the two adjacent permanent magnets at the position near the inner end are reduced, and the output power of the rotor core is improved. Preferably, non-magnetic conductive injection molding bodies are injected into the first inner magnetism isolating groove 117 and the second inner magnetism isolating groove 127 to reinforce the magnets in the permanent magnet installation grooves. Similarly, a non-magnetic conductive injection molded body is injected into the first outer magnetism isolating groove 116 to reinforce the magnet in the permanent magnet installation groove.
In some embodiments, at least one first shoulder 1121 is formed on a circumferential end surface of the first permanent magnet slot 112; and at least one second shoulder 1221 is formed on the circumferential end surface of the second permanent magnet slot 122. Preferably, there are two first shoulders 1121 and 1221. When the permanent magnet is installed in the permanent magnet installation groove, the radial inner end of the permanent magnet is tightly jacked by the inner jacking end 1171, and the radial outer end of the permanent magnet is tightly jacked by the first shoulder 1121 and the second shoulder 1221, so that the installation stability of the permanent magnet in the permanent magnet installation groove is improved, and the shaking of the permanent magnet in the permanent magnet installation groove when the rotor rotates is reduced. Further, the first shoulder 1121 protrudes along the inner side of the first permanent magnet slot 112 to form a right angle, so that the outer end of the first permanent magnet slot 112 is formed with a first outer magnetism isolating slot 116; the second shoulder 1221 protrudes along the inner side of the second permanent magnet slot 122 to form a right angle, so that the outer end of the second permanent magnet slot 122 is formed with a second outer magnetism isolating slot 126. The first outer flux barrier 116 and the second outer flux barrier 126 serve as outer magnetic flux barriers, and leakage of magnetic flux at the radial outer end can be further prevented, so that the energy conversion efficiency and the maximum output power are further improved.
If the number of groups of closed rotor punching sheet groups is a, the number of groups of open rotor punching sheet groups is b, the number of closed rotor punching sheets in each group of closed rotor punching sheet groups is x, and the number of open rotor punching sheets in each group of open rotor punching sheet groups is y, a is more than or equal to 1, b is more than or equal to 1, x is more than or equal to 1, and y is more than or equal to 1. In some embodiments, a, b, y, and 1, the closed rotor sheet assembly is disposed above the open rotor sheet assembly, and the magnetic isolation passages 125 on the single open rotor sheet form 8 magnetic isolation through holes 13 on the outer end surface of the rotor core 1. Preferably, in some embodiments, a ≧ 1, b ≧ 1, x ═ 1, and y ═ 4. Specifically, the rotor core 1 is arranged in the following structure in order from top to bottom: first group of open type rotor punching sheet group, first group of closed type rotor punching sheet group, second group of open type rotor punching sheet group, third group of open type rotor punching sheet group, second group of closed type rotor punching sheet group, fourth group of open type rotor punching sheet group, fifth group of open type rotor punching sheet group, third group of closed type rotor punching sheet group, sixth group of open type rotor punching sheet group, seventh group of open type rotor punching sheet group, fourth group of closed type rotor punching sheet group, eighth group of open type rotor punching sheet group, ninth group of open type rotor punching sheet group, fifth group of closed type rotor punching sheet group, tenth group of open type rotor punching sheet group, eleventh group of open type rotor punching sheet group, sixth group of closed type rotor punching sheet group, twelfth group of open type rotor punching sheet group, thirteenth group of open type rotor punching sheet group, seventh group of closed type rotor punching sheet group, fourteenth group of open type rotor punching sheet group, sixth group of open type rotor punching sheet group, and sixth group of open type rotor punching sheet group A punching sheet set of a rotor is provided.
Preferably, in some embodiments, rotor core 1 clamps one closed rotor punch segment group between a plurality of open rotor punch segment groups. The closed rotor punching sheet group is provided with the outer magnetic isolation bridge 115, so that the closed rotor punching sheet group has higher structural strength and stability, and can play a role of connecting bridges when being connected with the open rotor punching sheet group, so that a plurality of open rotor punching sheet groups are connected, and the structural strength and stability of the whole rotor core are improved. In addition, if the open rotor punching sheet groups are connected through the closed rotor punching sheet groups to improve the strength, only the two ends of each closed rotor punching sheet group are required to be connected with at least one open rotor punching sheet group, and at the moment, the two ends of each closed rotor punching sheet group along the axial direction are utilized and are used as the maximum function of a 'connecting bridge'. If both ends of each closed rotor punching sheet group are the open rotor punching sheet groups, the end part of the assembled whole rotor core is determined to be the open rotor punching sheet group, and the closed rotor punching sheet group can be used as a 'connecting bridge' to play a larger role as far as possible by the arrangement.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. Rotor core (1), characterized by comprising:
the closed type rotor punching sheet set comprises a plurality of closed type rotor punching sheets (11) which are sequentially stacked along the axial direction, each closed type rotor punching sheet (11) comprises a closed type punching sheet body (118), a plurality of first permanent magnet grooves (112) are formed in each closed type punching sheet body (118), the first permanent magnet grooves (112) are radially arranged in the circumferential direction of each closed type punching sheet body (118), a first inner magnetism isolating groove (117) is formed in the inner end of each first permanent magnet groove (112), and an inner abutting end (1171) protruding outwards along the radial direction is formed on the radial end face of each first inner magnetism isolating groove (117);
at least one group of open type rotor punching sheet groups, wherein the closed type rotor punching sheet groups and the open type rotor punching sheet groups are alternately stacked along the axial direction, the open type rotor punching sheet group comprises a plurality of open type rotor punching sheets (12) which are sequentially stacked along the axial direction, the open type rotor punching sheet (12) comprises an open type punching sheet body (128), a plurality of second permanent magnet grooves (122) are formed in the open type punching sheet body (128), the second permanent magnet grooves (122) are radially arranged in the circumferential direction of the open type punching sheet body (128), a second inner magnetism isolation groove (127) is formed at the inner end of the second permanent magnet groove (122), a radial end surface of the second inner magnetism isolating groove (127) is provided with a groove (1271) which is concave along the radial inner side, the first permanent magnet groove (112) and the second permanent magnet groove (122) are communicated with each other to form a permanent magnet mounting groove for mounting a permanent magnet.
2. The rotor core (1) of claim 1, wherein a first through hole (111) is formed in a rotation center of the closed type punching sheet body (118), two adjacent first permanent magnet slots (112) define a first magnetic pole (114) located therebetween, a first inner magnetic isolation bridge (113) is formed between an inner end of each first permanent magnet slot (112) and the first through hole (111), an outer magnetic isolation bridge (115) is formed between an outer end of each first permanent magnet slot (112) and an outer periphery of the closed type punching sheet body (118), and a plurality of closed type rotor punching sheets (11) are combined into a rigid whole.
3. The rotor core (1) of claim 1, wherein a second through hole (121) is formed in a rotation center of the open punching sheet body (128), two adjacent second permanent magnet slots (122) define a second magnetic pole (124) therebetween, a second inner magnetic isolation bridge (123) is formed between an inner end of each second permanent magnet slot (122) and the second through hole (121), an outer end of each second permanent magnet slot (122) is communicated with a magnetic isolation passage (125) leading to the outside, and a plurality of open punching sheets (12) are combined into a rigid whole.
4. The rotor core (1) according to claim 1, wherein the first permanent magnet slot (112) and the second permanent magnet slot (122) are arranged in a trapezoidal structure, and a width dimension of the first permanent magnet slot (112) in a circumferential direction and a width dimension of the second permanent magnet slot (122) in the circumferential direction are gradually reduced while being enlarged with a radius.
5. The rotor core (1) according to claim 4, wherein the ratio of the inner end circumferential width of the first permanent magnet slot (112) to the outer end circumferential width of the first permanent magnet slot (112) is 1: 0.85.
6. The rotor core (1) according to claim 1, wherein the number of the closed rotor punching sheet groups is a, the number of the open rotor punching sheet groups is b, the number of the closed rotor punching sheets in each closed rotor punching sheet group is x, the number of the open rotor punching sheets in each open rotor punching sheet group is y, and if a is greater than or equal to 1, b is greater than or equal to 1, x is 1, and y is 4.
7. The rotor core (1) according to claim 1, wherein said rotor core (1) clamps one said closed rotor punching sheet group between a plurality of said open rotor punching sheet groups.
8. The rotor core (1) according to claim 1, wherein a width dimension of the first inner flux barrier groove (117) in a circumferential direction is larger than a width dimension of the first permanent magnet groove (112) in the circumferential direction, and a width dimension of the second inner flux barrier groove (127) in the circumferential direction is larger than a width dimension of the second permanent magnet groove (122) in the circumferential direction.
9. The rotor core (1) according to claim 1, wherein at least one first shoulder (1121) is formed on a circumferential end surface of the first permanent magnet slot (112); and at least one second shoulder (1221) is formed on a circumferential end surface of the second permanent magnet slot (122).
10. The rotor core (1) according to claim 9, wherein the first shoulder (1121) protrudes at a right angle along the inside of the first permanent magnet slot (112) such that the outer end of the first permanent magnet slot (112) is formed with a first outer flux barrier slot (116); the second shoulder (1221) protrudes along the inner side of the second permanent magnet groove (122) to form a right angle, so that a second outer magnetism isolating groove (126) is formed at the outer end of the second permanent magnet groove (122).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110900296.2A CN113691041A (en) | 2017-11-01 | 2017-11-01 | Rotor core |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711060148.4A CN107733111A (en) | 2017-11-01 | 2017-11-01 | A kind of rotor core |
| CN202110900296.2A CN113691041A (en) | 2017-11-01 | 2017-11-01 | Rotor core |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711060148.4A Division CN107733111A (en) | 2017-11-01 | 2017-11-01 | A kind of rotor core |
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| Publication Number | Publication Date |
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| CN113691041A true CN113691041A (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110900296.2A Pending CN113691041A (en) | 2017-11-01 | 2017-11-01 | Rotor core |
| CN201711060148.4A Pending CN107733111A (en) | 2017-11-01 | 2017-11-01 | A kind of rotor core |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711060148.4A Pending CN107733111A (en) | 2017-11-01 | 2017-11-01 | A kind of rotor core |
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| Country | Link |
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| CN (2) | CN113691041A (en) |
| WO (1) | WO2019085499A1 (en) |
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| CN113691041A (en) * | 2017-11-01 | 2021-11-23 | 莱克电气股份有限公司 | Rotor core |
| JP7195752B2 (en) * | 2018-03-30 | 2022-12-26 | 株式会社マキタ | Electric tool |
| CN108808922B (en) * | 2018-05-31 | 2020-06-30 | 广东威灵电机制造有限公司 | Rotor core and motor |
| CN109067035A (en) * | 2018-07-27 | 2018-12-21 | 迈科国际控股（香港）有限公司 | Motor core, rotor and brushless motor |
| CN110971029B (en) * | 2018-09-28 | 2022-03-01 | 佛山市威灵洗涤电机制造有限公司 | Rotor punching sheet, rotor and motor |
| EP3657639A1 (en) * | 2018-11-26 | 2020-05-27 | LG Electronics Inc. | Motor |
| CN112600371B (en) * | 2020-12-18 | 2022-06-21 | 山东理工大学 | Production method of locking ring type modular double-excitation driving motor rotor |
| CN112821615A (en) * | 2021-02-24 | 2021-05-18 | 上海电机学院 | Rotor structure for flux weakening and speed increasing of permanent magnet synchronous motor for tangential magnetization |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107733111A (en) | 2018-02-23 |
| WO2019085499A1 (en) | 2019-05-09 |
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