CN114744796A - Rotor structure and motor - Google Patents
Rotor structure and motor Download PDFInfo
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- CN114744796A CN114744796A CN202210503815.6A CN202210503815A CN114744796A CN 114744796 A CN114744796 A CN 114744796A CN 202210503815 A CN202210503815 A CN 202210503815A CN 114744796 A CN114744796 A CN 114744796A
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 239000010703 silicon Substances 0.000 claims description 6
- 229910000976 Electrical steel Inorganic materials 0.000 abstract description 16
- 239000000725 suspension Substances 0.000 abstract description 12
- 239000007787 solid Substances 0.000 abstract description 10
- 238000005516 engineering process Methods 0.000 abstract description 8
- 238000010030 laminating Methods 0.000 abstract description 6
- 230000035699 permeability Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 235000012431 wafers Nutrition 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
-
- 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
- H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
- H02K1/2733—Annular magnets
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention belongs to the technical field of motors and discloses a rotor structure and a motor. The invention replaces the middle and short shaft in the related technology with the rotor core, the rotor core is formed by laminating the high-permeability silicon steel sheets, on one hand, the middle and short shaft has high permeability, on the other hand, the rotor core is formed by laminating the silicon steel sheets, and the magnetic resistance between the silicon steel sheets is greatly reduced compared with a solid structure, so that the eddy current loss generated by forming a magnetic circuit on the surface of the rotor core is greatly reduced, the efficiency of the motor can be effectively improved, the eddy current loss is reduced, the temperature rise of the surface of the sheath, the permanent magnet and the rotor core is effectively reduced, and the suspension precision and the stability of the rotor are improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a rotor structure and a motor.
Background
The magnetic suspension motor is a motor with low loss and high performance, wherein a rotor is suspended in the air, so that the rotor of the motor is not in mechanical contact with or mechanical friction with a stator of the motor; the magnetic suspension motor has the advantages of low noise, long service life, no need of lubrication, no need of sealing, no oil pollution and the like besides the advantages of no mechanical friction and low energy consumption when the motor rotates at a high speed, and the rotating speed of the magnetic suspension motor rotor is only limited by the tensile strength of a rotor material, so that the peripheral speed of the magnetic suspension motor rotor can be very high, and the application in high-speed equipment is more and more extensive.
The traditional high-speed motor rotor structure of the side-weight speed type non-salient pole type consists of a rotor, a permanent magnet and a sheath, because the permanent magnet is subjected to very large circumferential tension in the operation process of the high-speed motor, the permanent magnet has the characteristics of compression resistance and no tension resistance, and in order to prevent the permanent magnet from being damaged in a normal working state, the strength protection must be carried out on the permanent magnet through the sheath; the existing high-speed motor rotor adopts a three-section structure and consists of a front short shaft, a middle short shaft, a rear short shaft, a permanent magnet and a sheath, wherein the permanent magnet is sleeved on the middle short shaft, the middle short shaft adopts a solid structure, the material is magnetic conductive, the magnetic resistance of the solid structure is large, the eddy current loss on the surface of the middle short shaft is large, and the permanent magnet and the sheath can generate a large amount of heat to cause temperature rise and cause magnetic performance reduction and influence the motor efficiency under long-time operation; meanwhile, the temperature is too high, the deformation of the outer circle of the sheath is too large, the rotor is eccentric, the suspension precision is poor, the vibration is abnormal, and the stable operation of the rotor is influenced.
Disclosure of Invention
In view of this, the invention provides a rotor structure and a motor, in which a rotor core formed by stacking rigid silicon wafers is used to replace a middle short shaft of a traditional solid structure, so that the temperature rise of a rotor can be effectively reduced, and the suspension precision and stability of the rotor can be improved.
In order to solve the above problem, according to an aspect of the present application, an embodiment of the present invention provides a rotor structure, where the rotor structure includes a rotor core, a permanent magnet, a first short shaft, a second short shaft, and a sheath, the rotor core is formed by stacking a plurality of rigid silicon wafers, one end of the rotor core is connected to the first short shaft, and the other end of the rotor core is connected to the second short shaft, the permanent magnet is sleeved on the rotor core, and the sheath is sleeved on the permanent magnet.
In some embodiments, a first assembling groove is formed in one end, close to the rotor core, of the first short shaft, a second assembling groove is formed in one end, close to the rotor core, of the second short shaft, one end of the rotor core is clamped in the first assembling groove, and the other end of the rotor core is clamped in the second assembling groove.
In some embodiments, the rotor structure further comprises a limiting assembly, wherein the limiting assembly enables the permanent magnet to be fixedly connected with the rotor core and is used for avoiding circumferential deviation of the permanent magnet.
In some embodiments, spacing subassembly is including seting up the constant head tank on the rotor core outer peripheral face, and spacing subassembly still includes the reference column that sets up on the permanent magnet inner peripheral face, and the reference column can the joint in the constant head tank.
In some embodiments, the number of the positioning grooves is at least two, and the positioning grooves are uniformly distributed along the peripheral surface of the rotor core, and the number of the positioning columns is the same as that of the positioning grooves and is arranged in a one-to-one correspondence manner.
In some embodiments, the permanent magnets are interference fit with the rotor core.
In some embodiments, the permanent magnet is an interference fit with the sheath.
In some embodiments, each rigid silicon wafer is provided with a rivet hole, and a plurality of rigid silicon wafers are stacked and fixed together through the rivet holes to form the rotor core.
In some embodiments, the rotor core and the first assembly groove, and the rotor core and the second assembly groove are assembled by hot-assembling.
In some embodiments, the permanent magnets are assembled with the rotor core by shrink fitting.
According to another aspect of the present application, an embodiment of the present invention provides an electric machine including the rotor structure described above.
Compared with the prior art, the rotor structure of the invention has at least the following beneficial effects:
in the related technology, a solid magnetic conductive material is adopted as the middle short shaft, the eddy current loss on the surface of the middle short shaft is large due to the large magnetic resistance of a solid structure, and a permanent magnet and a sheath can generate a large amount of heat under long-time operation, so that the temperature is too high, the magnetic performance is reduced due to the too high temperature, and the motor efficiency is influenced; meanwhile, the temperature is too high, the deformation of the outer circle of the sheath is too large, the rotor is eccentric, the suspension precision is poor, the vibration is abnormal, and the stable operation of the rotor is influenced; the rotor core replaces a middle and short shaft in the related technology, and is formed by laminating high-permeability silicon steel sheets, so that the middle and short shaft has high permeability on one hand, and the rotor core adopts the silicon steel sheets, and the magnetic resistance between the silicon steel sheets is greatly reduced compared with a solid structure, therefore, the eddy current loss generated by forming a magnetic circuit on the surface of the rotor core is greatly reduced, the motor efficiency can be effectively improved, the eddy current loss is reduced, the temperature rise of the surface of the sheath, the permanent magnet and the rotor core is effectively reduced, and the suspension precision and the stability of the rotor are improved.
On the other hand, the motor provided by the present invention is designed based on the above rotor structure, and the beneficial effects thereof are referred to the beneficial effects of the above rotor structure, which are not described herein again.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a rotor structure provided by an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a rotor structure provided by an embodiment of the present invention;
FIG. 3a is a cross-sectional view of a first stub shaft in a rotor structure provided by an embodiment of the present invention;
FIG. 3b is a cross-sectional view of a second stub shaft in a rotor structure provided by an embodiment of the present invention;
fig. 4a is a cross-sectional view of a rotor structure in which permanent magnets and a rotor core are engaged according to an embodiment of the present invention;
fig. 4b is another cross-sectional view of a rotor structure with permanent magnets and a rotor core engaged in accordance with an embodiment of the present invention;
FIG. 5a is a cross-sectional view of a rotor core in a rotor structure according to an embodiment of the present invention;
FIG. 5b is another cross-sectional view of a rotor core in a rotor structure according to an embodiment of the present invention;
FIG. 6a is a cross-sectional view of a permanent magnet in a rotor structure provided by an embodiment of the present invention;
FIG. 6b is another cross-sectional view of a permanent magnet in a rotor structure provided by an embodiment of the present invention;
fig. 7 is a cross-sectional view of a rotor structure provided by an embodiment of the present invention after a rotor core, permanent magnets, and a sheath are engaged;
fig. 8a is another cross-sectional view of a rotor structure in which permanent magnets and a rotor core are engaged in accordance with an embodiment of the present invention;
fig. 8b is another cross-sectional view of a rotor structure with permanent magnets and a rotor core engaged in accordance with an embodiment of the present invention;
fig. 9 is a cross-sectional view of a rotor core, permanent magnets, a first stub shaft, and a second stub shaft of a rotor structure according to an embodiment of the present invention.
Wherein:
1. a rotor core; 2. a permanent magnet; 3. a first minor axis; 4. a second minor axis; 5. a sheath; 11. positioning a groove; 12. rivet holes; 21. a positioning column; 31. a first fitting groove; 41. a second fitting groove.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the description of the present invention, it is to be understood that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention, and do not mean that the device or member to which the present invention is directed must have a specific orientation or position, and thus, cannot be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
The embodiment provides a rotor structure, as shown in fig. 1 and 2, the rotor structure includes rotor core 1, permanent magnet 2, first minor axis 3, second minor axis 4 and sheath 5, rotor core 1 is formed by stacking a plurality of silicon chips, one end of rotor core 1 is connected with first minor axis 3, the other end is connected with second minor axis 4, permanent magnet 2 is sleeved on rotor core 1, and sheath 5 is sleeved on permanent magnet 2.
Specifically, in this embodiment, one end of rotor core 1 is connected to first minor axis 3, and the other end is connected to second minor axis 4, that is to say, rotor core 1 is located between first minor axis 3 and second minor axis 4, and is fixed through first minor axis 3 and second minor axis 4, and, rotor core 1, first minor axis 3 and second minor axis 4 are fixed back, and first minor axis 3 and second minor axis 4 can wrap rotor core 1, and simultaneously, the part that first minor axis 3 and second minor axis 4 are higher than rotor core 1 is provided with permanent magnet 2, and sheath 5 overlaps on permanent magnet 2 and both ends extend to first minor axis 3 and second minor axis 4 respectively.
More specifically, as shown in fig. 6a and 6b, the rotor core 1 is formed by laminating conventional silicon steel sheets, and a rivet hole 12 is formed in each 90 ° of the silicon steel sheets in the circumferential direction, so that the rotor core 1 is locked by a rivet.
In the related technology, a solid magnetic conductive material is adopted as a middle short shaft, the eddy current loss on the surface of the middle short shaft is large due to the large magnetic resistance of a solid structure, and a permanent magnet and a sheath can generate a large amount of heat under the long-time operation, so that the temperature is too high, the magnetic performance is reduced due to the too high temperature, and the motor efficiency is influenced; meanwhile, the temperature is too high, the deformation of the outer circle of the sheath is too large, the rotor is eccentric, the suspension precision is poor, the vibration is abnormal, and the stable operation of the rotor is influenced; the rotor core 1 is used for replacing a middle and short shaft in the related technology, the rotor core 1 is formed by laminating high-permeability silicon steel sheets, on one hand, the middle and short shaft has high permeability, on the other hand, the rotor core is formed by laminating the silicon steel sheets, and the magnetic resistance between the silicon steel sheets is greatly reduced compared with a solid structure, so that the eddy current loss generated by the formation of a magnetic circuit on the surface of the rotor core 1 is greatly reduced, the motor efficiency can be effectively improved, the eddy current loss is reduced, the temperature rise of the surface of a sheath, a permanent magnet and the rotor core is effectively reduced, and the suspension precision and the stability of a rotor are improved.
In a specific embodiment:
as shown in fig. 3a, a first assembling groove 31 is formed at one end of the first stub shaft 3 close to the rotor core 1, and as shown in fig. 3b, a second assembling groove 41 is formed at one end of the second stub shaft 4 close to the rotor core 1, one end of the rotor core 1 is clamped in the first assembling groove 31, and the other end of the rotor core 1 is clamped in the second assembling groove 41.
Specifically, in the related art, in order to mutually match the first short shaft, the second short shaft and the middle short shaft, shaft shoulders need to be formed on the first short shaft and the second short shaft, while in the present embodiment, a groove is dug at the center of the first short shaft 3, that is, the first assembly groove 31, and a groove is dug at the center of the second short shaft 4, that is, the second assembly groove 41, and the first assembly groove 31 and the second assembly groove 41 are used for fixing the rotor core 1;
meanwhile, the first stub shaft 3, the second stub shaft 4 and the rotor core 1 are also used for assembling the permanent magnet 2, specifically: the first assembly groove 31 is formed to enable the upper end and the lower end of the first short shaft 3 to extend outwards to form a first extension section, the second assembly groove 41 is formed to enable the upper end and the lower end of the second short shaft 4 to extend outwards to form a second extension section, and the permanent magnet 2 is clamped between the first extension section and the second extension section and sleeved on the rotor core 1.
In a specific embodiment:
the rotor structure further comprises a limiting assembly, wherein the limiting assembly enables the permanent magnet 2 and the rotor core 1 to be fixedly connected and is used for avoiding circumferential deviation of the permanent magnet 2.
Specifically, as shown in fig. 4a, 4b, 5a and 5b, the limiting assembly includes a positioning groove 11 formed on the outer peripheral surface of the rotor core 1, and further includes a positioning post 21 disposed on the inner peripheral surface of the permanent magnet 2, and the positioning post 21 can be clamped in the positioning groove 11.
In the related technology, the permanent magnet is glued on the rotor shaft, the rotating shaft is matched with the permanent magnet through the sheath to complete the connection effect, but when the sheath is assembled into the shaft, the permanent magnet may move along the circumferential direction to generate theta angle deviation, correspondingly, the magnetizing direction also generates theta angle, so that the magnetizing performance is reduced, the current correction cannot be carried out, the performance is reduced, and the efficient and stable operation of the motor cannot be ensured; in the embodiment, the positioning groove 11 is milled on the outer circle of the rotor core 1, the positioning column 21 is machined on the inner circle of the permanent magnet 2, and when the permanent magnet 2 is sleeved on the rotor core 1 and the positioning column 21 is clamped in the positioning groove 11, the permanent magnet 2 and the rotor core 1 are proved to be assembled; and, through the cooperation of reference column 21 and constant head tank 11 for rotor core 1 possesses spacing ability, avoids permanent magnet 2 to take place axial skew in inside, and then can guarantee to magnetize stable and reliable.
In a specific embodiment:
in order to better avoid the circumferential upward offset of the permanent magnet 2, the positioning grooves 11 are at least two and uniformly distributed along the outer circumferential surface of the rotor core 1, and the positioning columns 21 are arranged in the same number as the positioning grooves 11 and in one-to-one correspondence with the positioning grooves 11.
The number of the positioning grooves 11 is preferably two, the positioning grooves 11 are milled at every 180 degrees of the outer circle of the rotor core 1 along the circumferential direction, the permanent magnet 2 is similar to the rotor core 1, and positioning columns 21 are machined at 180 degrees of the inner circle along the circumferential direction and are matched with the positioning grooves 11 on the rotor core 1 for use; two constant head tanks 11 can play better location effect, can also avoid the too much destruction to permanent magnet 2 and rotor core 1's structure simultaneously.
In a specific embodiment:
the permanent magnet 2 is in interference fit with the rotor iron core 1;
during the mechanical installation process, many parts need to be tightly matched to prevent connection from falling off or transfer large torque, so that interference fit is generated; the interference fit is that the hole is expanded and deformed by the elasticity of the material to be sleeved on the shaft, and when the hole is restored, the clamping force to the shaft is generated, so that the two parts are connected. Specifically, in this embodiment: the permanent magnet 2 is of an annular structure, the center hole of the permanent magnet is expanded and deformed by the elasticity of the permanent magnet, the permanent magnet is sleeved on the rotor core 1, and then the center hole of the permanent magnet 2 is restored to generate a clamping force on the rotor core 1, so that the rotor core 1 is connected with the permanent magnet 2, and the permanent magnet 2 is prevented from falling off or transmitting large torque in this way.
In a specific embodiment:
the permanent magnet 2 is in interference fit with the sheath 5.
Specifically, the elasticity of the sheath 5 is utilized to expand and deform the central hole of the sheath 5, and then the central hole is sleeved on the permanent magnet 2, and then when the central hole of the sheath 5 is restored, the clamping force to the permanent magnet 2 is generated, so that the sheath 5 is connected with the permanent magnet 2, and the sheath 5 is prevented from falling off or transmitting large torque.
In the related technology, the middle short shaft is in clearance fit with the first short shaft and the second short shaft and is also in clearance fit with the permanent magnet, when the motor rotates at a high speed, the centrifugal force is large, and great equivalent stress is generated on the outer circle side, so that the deformation is serious, and once the motor runs in an overload state, the middle short shaft can have the problem of super yield strength, thereby affecting the product quality and the stable running of the rotor; in yet another embodiment, as shown in fig. 7, the interference fit of the permanent magnet 2 with the rotor core 1 and the interference fit of the permanent magnet 2 with the sheath 5 are satisfied at the same time; according to the thick-wall cylinder theory and the Lame formula, the two objects are in interference fit, when the rotor core 1 is in a static state, the contact surface of the rotor core 1 has compressive stress, and when the rotor core 1 rotates at a high speed, the rotor core 1 has tensile stress (the interference compressive stress is used for offsetting a part of the rotating tensile stress, the total Von Mileiss stress is reduced, which means that the deformation caused by the stress is reduced); the double-layer interference means that the permanent magnet 2 is in interference with the rotor core 1, the permanent magnet 2 causes compressive stress to the rotor core 1, the sheath 5 is in interference with the permanent magnet 2, and the sheath 5 causes compressive stress to the permanent magnet 2 and finally directly influences the compressive stress to the surface of the rotor core 1 on the bottom layer; by means of the method, pressure early warning is provided in advance, equivalent stress during high-speed operation is dispersed, deformation of a rotor core is reduced, and stable operation of the rotor is guaranteed.
In a specific embodiment:
each silicon steel sheet is provided with a rivet hole 12, a plurality of silicon steel sheets are overlapped and fixed together through the rivet holes 12 to form the rotor core 1, specifically, the rivet holes are formed in the circumferential direction of the silicon steel sheets at every 90 degrees, and the rotor core 1 is locked through rivets.
In a specific embodiment:
Specifically, the hot-fitting mode is mainly used for matching parts which are tight, inconvenient to press or easy to damage, and the principle of expansion with heat and contraction with cold is mainly utilized; specifically, in this embodiment, the inner diameters of the first assembling groove 31 and the second assembling groove 41 are expanded by heating, and then the rotor core 1 can be easily placed in the first assembling groove 31 and the second assembling groove 41, after the assembly is completed, when the first assembling groove 31 and the second assembling groove 41 are restored to room temperature, the size of the inner diameter is restored to the original size, and the effect of matching the first assembling groove 31, the second assembling groove 41 and the rotor core 1 is achieved by this way.
In a specific embodiment:
as shown in fig. 8a and 8b, permanent magnet 2 is assembled with rotor core 1 by shrink fitting.
Specifically, the inner diameter of the permanent magnet 2 is expanded in a heating mode, then the permanent magnet 2 can be easily sleeved on the rotor core 1, after assembly is completed, when the permanent magnet 2 is recovered to the room temperature, the size of the inner diameter is recovered to the original size, and the effect of matching the permanent magnet 2 and the rotor core 1 is achieved in the mode.
The assembly process of the rotor structure provided by the embodiment is as follows:
stacking a plurality of silicon steel sheets together, forming rivet holes at every 90 degrees in the circumferential direction of the silicon steel sheets, locking the iron core by using 4 rivets in the circumferential direction, and simultaneously processing two positioning grooves 11 on the outer circle side to form a rotor iron core 1;
two positioning columns 21 are processed on the inner circumferential surface of the permanent magnet 2; machining a first fitting groove 31 in the first stub shaft 3; machining a second fitting groove 41 in the second stub shaft 4;
heating the first stub shaft 3, fixing the first stub shaft after the heating is finished, and then thermally sleeving the rotor core 1 into the first assembling groove 31 of the first stub shaft 3;
fixing a rotor iron core 1, heating a permanent magnet 2, and thermally sleeving the permanent magnet 2 into the rotor iron core 1 by utilizing the matching of a positioning groove 11 and a positioning column 21, wherein the end face of the permanent magnet 2 is attached to the end faces of a first short shaft 3 and a second short shaft 4;
heating the second short shaft 4, sleeving the second short shaft 4 into the rotor core 1, matching the rotor core 1 with the second assembling groove 41 of the second short shaft 4, and attaching the end face to the end face of the second short shaft 4, as shown in fig. 9, so as to complete the assembly of the rotor core 1, the permanent magnet 2, the first short shaft 3 and the second short shaft 4;
and heating the sheath 5, fixing the first short shaft 3 and the second short shaft 4 by using a tool, and sleeving the sheath 5 on the permanent magnet 2 in a hot manner to complete the assembly of the rotor structure.
According to the rotor structure provided by the embodiment, the rotor iron core is used for replacing a middle-short shaft in the related technology, so that the magnetic resistance is reduced, the eddy current loss is reduced, the motor efficiency is improved, the rotor temperature rise is effectively reduced, and the suspension precision and stability of the rotor are improved; meanwhile, the positioning groove on the rotor core is matched with the positioning column on the permanent magnet, so that the effect of limiting the permanent magnet can be achieved; in addition, the rotor core is in double-layer interference fit, early warning pressure is provided in advance, equivalent stress during high-speed operation is dispersed, deformation of the rotor core is reduced, and stable operation of the rotor is guaranteed.
Example 2
The present embodiment provides a motor including the rotor structure of embodiment 1.
In summary, it is easily understood by those skilled in the art that the advantageous technical features described above can be freely combined and superimposed without conflict.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (11)
1. The utility model provides a rotor structure, its characterized in that, rotor structure includes rotor core (1), permanent magnet (2), first minor axis (3), second minor axis (4) and sheath (5), rotor core (1) is formed by a plurality of silicon chips that have just overlapped, the one end of rotor core (1) with first minor axis (3) are connected, the other end with second minor axis (4) are connected, permanent magnet (2) cover is established rotor core (1) is last, sheath (5) cover is established on permanent magnet (2).
2. The rotor structure according to claim 1, characterized in that one end of the first stub shaft (3) close to the rotor core (1) is provided with a first assembly groove (31), one end of the second stub shaft (4) close to the rotor core (1) is provided with a second assembly groove (41), one end of the rotor core (1) is clamped in the first assembly groove (31), and the other end of the rotor core (1) is clamped in the second assembly groove (41).
3. The rotor structure according to claim 1 or 2, characterized in that it further comprises a limiting assembly, which fixedly connects the permanent magnets (2) with the rotor core (1) for avoiding circumferential offset of the permanent magnets (2).
4. The rotor structure according to claim 3, characterized in that the limiting component comprises a positioning groove (11) formed on the outer circumferential surface of the rotor core (1), and the limiting component further comprises a positioning column (21) arranged on the inner circumferential surface of the permanent magnet (2), wherein the positioning column (21) can be clamped in the positioning groove (11).
5. The rotor structure according to claim 4, wherein at least two positioning slots (11) are provided and are uniformly distributed along the outer circumferential surface of the rotor core (1), and the positioning posts (21) are provided in the same number as the positioning slots (11) and are in one-to-one correspondence.
6. A rotor structure according to claim 1 or 2, characterised in that the permanent magnets (2) are interference fitted with the rotor core (1).
7. The rotor structure according to claim 6, characterized in that the permanent magnets (2) are interference fitted with the sheath (5).
8. The rotor structure according to claim 1 or 2, wherein each of the rigid silicon pieces is provided with a rivet hole (12), and a plurality of the rigid silicon pieces are stacked and fixed together through the rivet holes (12) to form the rotor core (1).
9. A rotor structure according to claim 2, characterized in that the rotor core (1) and the first assembly slot (31), and the rotor core (1) and the second assembly slot (41) are assembled by shrink fitting.
10. Rotor structure according to claim 1 or 2, characterised in that the permanent magnets (2) are assembled with the rotor core (1) by shrink fitting.
11. An electrical machine, characterized in that the electrical machine comprises a rotor structure according to any of claims 1-10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210503815.6A CN114744796A (en) | 2022-05-10 | 2022-05-10 | Rotor structure and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210503815.6A CN114744796A (en) | 2022-05-10 | 2022-05-10 | Rotor structure and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114744796A true CN114744796A (en) | 2022-07-12 |
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ID=82286276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210503815.6A Pending CN114744796A (en) | 2022-05-10 | 2022-05-10 | Rotor structure and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114744796A (en) |
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2022
- 2022-05-10 CN CN202210503815.6A patent/CN114744796A/en active Pending
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