CN112542910A - Motor rotor and motor - Google Patents
Motor rotor and motor Download PDFInfo
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- CN112542910A CN112542910A CN201910895250.9A CN201910895250A CN112542910A CN 112542910 A CN112542910 A CN 112542910A CN 201910895250 A CN201910895250 A CN 201910895250A CN 112542910 A CN112542910 A CN 112542910A
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- rotor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
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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
-
- 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
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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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 embodiment of the invention provides a motor rotor and a motor, wherein the motor rotor comprises a plurality of rotor punching sheets and supporting ribs, wherein: each rotor punching sheet is provided with a magnetic barrier through hole in a preset shape; the rotor punching sheets are stacked, and the magnetic barrier through holes on the rotor punching sheets are arranged oppositely; the supporting ribs penetrate through magnetic barrier through holes between the rotor punching sheets, the side edges of the supporting ribs are fixedly connected with each rotor punching sheet respectively, and the supporting ribs do not conduct magnetism. The motor rotor and the motor provided by the embodiment of the invention can improve the mechanical strength of the rotor on the premise of not arranging the magnetic isolation bridge, thereby solving the problem that the mechanical strength of the rotor is reduced due to thinning of the magnetic isolation bridge in the prior art and achieving better effect.
Description
Technical Field
The embodiment of the invention relates to the technical field of electromagnetic equipment, in particular to a motor rotor and a motor.
Background
An electric machine is an electromagnetic device that converts or transmits electric energy according to the law of electromagnetic induction, and generally includes a rotor and a stator. The motor mainly converts mechanical energy into electric energy, so that the efficiency of converting the mechanical energy into the electric energy reflects the working efficiency of the motor.
The motor types mainly include permanent magnet motors and reluctance motors. In a permanent magnet motor, a magnetic isolation bridge is usually arranged, magnetic flux at the magnetic bridge reaches saturation to play a role in limiting magnetic leakage, and the working efficiency of the motor is improved, so that the smaller the width of the magnetic isolation bridge is, the better the magnetic isolation effect is from the perspective of preventing magnetic leakage. However, when the width of the magnetic isolation bridge is too low, the centrifugal force generated by the high-speed rotation of the motor rotor can damage the rotor structure. In a reluctance motor, the salient pole ratio can be improved by thinning a magnetic isolation bridge, so that the motor performance is improved, but the rotor structure is damaged when a motor rotor rotates at a high speed due to the thinning of the magnetic isolation bridge.
Therefore, a motor structure is needed to solve the problem that the mechanical strength of the rotor is reduced due to the thinning of the magnetic isolation bridge when the performance of the motor is improved in the prior art.
Disclosure of Invention
The embodiment of the invention provides a motor rotor and a motor, and aims to solve the problem that the mechanical strength of the rotor is reduced due to the fact that a magnetic isolation bridge is thinned when the performance of the motor is provided in the existing motor structure.
In a first aspect, an embodiment of the present invention provides a motor rotor, including a plurality of rotor sheets and support ribs, where:
each rotor punching sheet is provided with a magnetic barrier through hole in a preset shape;
the rotor punching sheets are stacked, and the magnetic barrier through holes on the rotor punching sheets are arranged oppositely;
the supporting ribs penetrate through magnetic barrier through holes between the rotor punching sheets, the side edges of the supporting ribs are fixedly connected with each rotor punching sheet respectively, and the supporting ribs do not conduct magnetism.
In one possible implementation, the mechanical strength of the support rib is higher than a preset strength.
In a possible implementation manner, for each magnetic barrier through hole, a plurality of support ribs are arranged in each magnetic barrier through hole in a penetrating manner.
In a possible implementation manner, the rotor punching sheet comprises a plurality of ventilation holes, and the ventilation holes are used for reducing the weight of the motor rotor and reducing the temperature of the motor rotor during rotation.
In a possible implementation manner, the motor rotor further includes a rotating shaft, the rotating shaft is disposed in the center of the motor rotor, and the motor rotor rotates around the rotating shaft.
In one possible implementation manner, the rotor sheet further includes a permanent magnet slot and a permanent magnet, wherein:
the permanent magnet groove is connected with the magnetic barrier through hole and used for placing the permanent magnet.
In a second aspect, an embodiment of the present invention provides an electric machine, including an electric machine stator and an electric machine rotor as described in any one of the first aspect.
In one possible implementation, the motor further comprises a motor rotor pressure plate, wherein:
the motor rotor pressing plates are arranged at two ends of the motor rotor and used for fixing the motor rotor.
In one possible implementation, the apparatus further includes a permanent magnet baffle, where the permanent magnet baffle is configured to:
when the permanent magnet is placed in the permanent magnet groove of the rotor punching sheet, the permanent magnet is arranged at two ends of the permanent magnet and used for fixing the permanent magnet.
The motor rotor and the motor provided by the embodiment of the invention comprise a plurality of rotor punching sheets and supporting ribs, wherein each rotor punching sheet is provided with a magnetic barrier through hole in a preset shape, the rotor punching sheets are stacked, the magnetic barrier through holes on the rotor punching sheets are arranged oppositely, the supporting ribs are arranged in the magnetic barrier through holes of the rotor punching sheets in a penetrating mode, the side edges of the supporting ribs are fixedly connected with the rotor punching sheets respectively, and the supporting ribs are not magnetic. According to the scheme provided by the embodiment of the invention, no magnetic isolation bridge is required to be additionally arranged for the permanent magnet motor or the reluctance motor. For the permanent magnet motor, the no-load magnetic leakage coefficient can be adjusted by arranging the magnetic barrier through holes, so that the performance of the permanent magnet motor is improved, meanwhile, the support ribs are arranged in the magnetic barrier through holes of each rotor punching sheet in a penetrating manner, so that the mechanical strength of a motor rotor is improved, and meanwhile, the support ribs are made of materials which are not magnetic and have certain strength, so that the no-load magnetic leakage coefficient of the permanent magnet motor cannot be influenced, and the contradiction between the no-load magnetic leakage coefficient of the permanent magnet motor and the mechanical strength of the rotor is solved; for the corresponding reluctance motor, the mechanical strength of the motor rotor can be improved by arranging the support ribs, so that the problem that the salient pole ratio of the reluctance motor is reduced by arranging a wider magnetic isolation bridge is avoided, and the contradiction between the salient pole ratio and the mechanical strength of the rotor in the reluctance motor is solved. Therefore, the scheme provided by the embodiment of the invention can improve the mechanical strength of the rotor on the premise of not arranging the magnetic isolation bridge, thereby solving the problem that the mechanical strength of the rotor is reduced due to thinning the magnetic isolation bridge in the prior art and achieving better effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a rotor of an electric machine according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a motor rotor punching provided in the prior art;
fig. 3 is a schematic structural diagram of a motor according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a motor rotor according to an embodiment of the present invention, as shown in fig. 1, including a plurality of rotor sheets 10 and support ribs 11, where:
each rotor punching sheet 10 is provided with a magnetic barrier through hole 12 with a preset shape;
the rotor sheets 10 are stacked, and the magnetic barrier through holes 12 on the rotor sheets 10 are arranged opposite to each other;
the supporting ribs 11 penetrate through magnetic barrier through holes 12 between the rotor punching sheets 10, the side edges of the supporting ribs 11 are fixedly connected with each rotor punching sheet 10, and the supporting ribs 11 do not conduct magnetism.
As shown in fig. 1, a motor rotor includes a plurality of rotor sheets 10, and the positions of the plurality of rotor sheets 10 are opposite, that is, the magnetic barrier through hole 12 of each rotor sheet 10 is opposite. The motor rotor is a part of the motor, and the motor rotor needs to rotate when the motor is in a working state. In the motor rotor, a rotating shaft 13 is further included, wherein the rotating shaft 13 is arranged in the center of the motor rotor, and the motor rotor rotates around the rotating shaft 13.
In the rotor punching sheet 10 of the motor, the magnetic barrier through hole 12 is arranged, so that the no-load magnetic leakage coefficient of the motor can be adjusted. The leakage coefficient reflects the ratio of the total magnetic flux provided by the permanent magnet to the external magnetic circuit to the main magnetic flux of the external magnetic circuit, and changes with the saturation degree of the external magnetic circuit of the main magnetic circuit. The magnetic leakage coefficient comprises a no-load magnetic leakage coefficient and a load magnetic leakage coefficient, wherein the no-load magnetic leakage coefficient reflects the effective utilization degree of the magnetic flux provided by the permanent magnet outwards.
The calculation formula of the no-load magnetic leakage coefficient is as follows:
wherein, σ is no-load magnetic leakage coefficient, phimTotal flux, phi, provided to the external magnetic circuit by the permanent magnetσThe main flux in the outer magnetic path is generally the flux at the position of the magnetic path after passing through the magnetic barrier through hole 12.
The no-load leakage coefficient plays an important role in the key performance of the motor, and the no-load leakage coefficient can be adjusted through the arrangement of the magnetic barrier through holes 12, so that the performance of the motor is in a higher level. However, after more magnetic barrier through holes 12 are provided, the mechanical strength of the motor rotor punching sheet 10 is lower, and therefore, a magnetic isolation bridge can be arranged to improve the mechanical strength of the motor rotor punching sheet 10.
The principle of the magnetic isolation bridge is that the magnetic flux at the magnetic bridge part is saturated to play a role in limiting magnetic leakage, so that the smaller the width of the magnetic isolation bridge is, the better the magnetic isolation effect is from the perspective of preventing magnetic leakage. If the damage of the rotor structure by the centrifugal force generated by the high-speed rotation of the rotor is considered, the width of the magnetic isolation bridge should be considered while satisfying the mechanical strength of the rotor.
Therefore, the different requirements of the motor application occasions on the magnitude of the magnetic leakage coefficient are different, and the proper magnetic isolation measure is selected in the motor design according to the specific requirements on the magnitude of the magnetic leakage coefficient, so that the size of the magnetic isolation magnetic bridge can meet the no-load magnetic leakage coefficient requirement, the magnetic bridge has enough strength, the mechanical strength of the motor is improved, and the manufacturing cost of the motor is reduced.
Fig. 2 is a schematic structural diagram of a motor rotor punching sheet provided in the prior art, and as shown in fig. 2, the motor rotor punching sheet includes a magnetic barrier through hole 21 and a magnetic isolation bridge 22, where the magnetic isolation bridge 22 is connected with the motor rotor punching sheet, and the material of the magnetic isolation bridge 22 is the same as that of the motor rotor punching sheet. When the motor is in a working state, the motor rotor punching sheet rotates at a high speed.
If the magnetic isolation bridge 22 does not exist, the magnetic barrier through hole 21 needs to be formed to adjust the no-load leakage coefficient, and meanwhile, the permanent magnet 23 can be embedded into the magnetic barrier through hole 21, so that the performance of the motor is improved. When the magnetic barrier through holes 21 are large and the magnetic barrier through holes 21 on the rotor punching sheet are large, the gaps among the magnetic barrier through holes 21 are small.
When the motor rotor normally runs, the motor rotor is in a high-speed rotating state, and at the moment, the motor rotor punching sheet and the permanent magnet 23 are under the action of centrifugal force. The higher the rotating speed is, centrifugal force is bigger, and under the effect of great centrifugal force, the mechanical strength of the fragile part of the punching sheet body of the motor rotor punching sheet may be insufficient, that is, the mechanical strength of the motor rotor punching sheet is lower, and under the effect of centrifugal force, the structure damage is easily generated.
Even if the electronic rotor punching sheet is not broken, the electronic rotor punching sheet can also generate larger deformation, so that the normal work of the rotor punching sheet is influenced. Therefore, the magnetic isolation bridge 22 is arranged, and can play a certain protection role in mechanical strength of the motor rotor punching sheet.
However, after the magnetism isolating bridge 22 is added, the motor rotor punching sheet can generate magnetic leakage, so that the no-load magnetic leakage coefficient of the motor is reduced, and the structure, shape and size of the magnetic barrier through hole 21 also need to be comprehensively adjusted at the moment, so that the no-load magnetic leakage coefficient of the motor meets the requirement.
Further, although the magnetic isolation bridge 22 is arranged to enhance the mechanical strength of the motor rotor punching sheet, when the motor is in a working state, the rotating speed is very fast and the centrifugal force is large many times, and if the width of the magnetic isolation bridge 22 is narrow, the situation that the structure of the motor rotor punching sheet is damaged is likely to occur. Under the condition that the motor rotates at a high speed, part of the motor rotor punching sheet is separated from the motor rotor under the action of centrifugal force.
To avoid this, the prior art needs to increase the width of the magnetic bridge 22. After the width of magnetic isolation bridge 22 improves, the magnetic leakage phenomenon of motor rotor punching is more serious, and no-load magnetic leakage coefficient reduces, needs to continue to adjust magnetic barrier through-hole 21 this moment.
In actual production, in order to balance the contradiction between the no-load leakage coefficient and the mechanical strength of the motor rotor, testing needs to be performed back and forth under various conditions, a relatively proper magnetic barrier through hole 21 and a magnetic isolation bridge 22 with a proper width are selected, electromagnetic simulation and mechanical simulation are repeated to meet expected requirements, and the operation is complicated.
The working principle of the permanent magnet motor is that the rotation of the motor is realized by the stress of an electrified lead in a magnetic field, and the motor comprises the permanent magnet motor and another motor, namely a reluctance motor.
A reluctance motor is also a type of motor, and unlike a permanent magnet motor, the reluctance motor does not generate torque by an interaction of magnetic fields generated by stator and rotor winding currents to generate an action of force forming torque to rotate, but generates torque by a "reluctance minimum principle" to realize rotation.
The rotor of the reluctance motor is not provided with a coil, and the rotation of the motor cannot be realized by depending on the stress of an electrified lead in a magnetic field. In reluctance motors, the rotor is pulled to rotate by the attractive force between the teeth using the principle of minimum reluctance, i.e. the flux is always closed along the path of minimum reluctance.
The motor rotor of the reluctance motor does not or basically does not need a permanent magnet, and the difference of d-axis reluctance and q-axis reluctance is generated by punching a plurality of magnetic barrier through holes in a silicon steel sheet of the motor rotor. An important parameter for measuring the performance of the reluctance motor is the salient pole ratio of the motor, and if the salient pole ratio is high, the performance of the reluctance motor is high, otherwise, if the salient pole ratio is low, the performance of the reluctance motor is low.
In the reluctance motor, in order to guarantee the mechanical strength of the motor rotor, a magnetic isolation bridge is usually arranged, the strength of the motor rotor can be improved by increasing the width of the magnetic isolation bridge, but the salient pole ratio of the reluctance motor is reduced, so that the performance of the motor is reduced. And reducing the width of the magnetic isolation bridge, the salient pole ratio of the reluctance motor can be increased, but the mechanical strength of the motor rotor is reduced at the same time. During the process of high-speed rotation of the motor rotor, the mechanical strength of the motor rotor may be insufficient, and the motor rotor structure may be damaged.
The key for improving the performance of the permanent magnet reluctance motor is to improve the salient pole ratio. The salient pole ratio is improved by adopting a multi-layer structure and a magnetic bridge thinning method. As described above, the method of thinning the magnetic bridge by the multilayer structure brings about the same problem, that is, the mechanical strength of the motor rotor is rapidly limited, and therefore, the permanent magnet reluctance motor cannot be used for a motor with a high rotation speed. The contradiction between salient pole ratio and mechanical strength is solved, namely the magnetic bridge part is not magnetic, and the magnetic bridge does not need to be thinned.
One of the existing technical schemes is to adopt a dual-phase silicon steel method, i.e. one silicon steel sheet has two crystal phase structures, one is a common magnetic material, and the other is a non-magnetic material. However, this method requires a complicated process to implement, and is costly to implement. The other technical scheme is that the synchronous reluctance motor adopts a method of pre-saturating a magnetic bridge without thinning the magnetic bridge, and the salient pole ratio is improved by adding a permanent magnet in the magnetic bridge, so that the torque in a full speed range is improved to a certain extent. However, the mechanical structure cannot be strengthened, so that the mechanical structure can only be applied to the field with low rotating speed and good operating condition.
Therefore, the existing dual-phase silicon steel method needs a complex process to realize, and the method of increasing the salient pole ratio by adding the permanent magnet in the magnetic bridge still cannot achieve the expected mechanical structural strength and cannot meet the actual requirement. In order to solve the contradiction between the no-load leakage coefficient and the mechanical strength of the motor rotor in the permanent magnet motor and the contradiction between the salient pole ratio of the motor and the mechanical strength of the motor rotor in the reluctance motor, the embodiment of the invention realizes the purpose of fixing the motor rotor punching sheet by arranging the support ribs.
Specifically, as shown in fig. 1, each rotor sheet 10 is provided with a magnetic barrier through hole 12 in a preset shape, where the magnetic barrier through hole 12 is used for adjusting a no-load leakage coefficient, the magnetic barrier through hole 12 can be adjusted according to actual needs, the shape and size of the magnetic barrier through hole 12 are adjusted, and finally, the magnetic barrier through hole 12 in the preset shape meeting the no-load leakage coefficient is obtained.
After the magnetic barrier through hole 12 with the preset shape on the motor rotor punching sheet 10 is obtained, the embodiment of the invention does not arrange a magnetic isolation bridge on the motor rotor, thereby reducing the occurrence of magnetic leakage to the maximum extent and having no influence on the no-load magnetic leakage coefficient of the motor.
At this time, the mechanical strength of the motor rotor sheet 10 is not sufficient, and the problem that the mechanical structure of the electronic sheet is easily damaged when the motor rotates at a high speed is easily caused. Therefore, to solve this problem, the embodiment of the present invention provides the support ribs 11 on each of the plurality of magnetic barrier through holes 12 of a predetermined shape.
As shown in fig. 1, the support rib 11 is a non-magnetic material. When a plurality of rotor sheets 10 are stacked to form a rotor core, the supporting ribs 11 penetrate through the magnetic barrier through holes 12 between the rotor sheets 10, and the side edges of the supporting ribs 11 are respectively fixedly connected with each rotor sheet 10. The supporting ribs 11 can penetrate through the magnetic barrier through holes between each rotor punching sheet 10, when the mechanical strength of the supporting ribs 11 is high, the supporting ribs 11 can be arranged at intervals, namely the supporting ribs 11 penetrate through part of the rotor punching sheets 10, the supporting ribs 11 are not arranged in part of the rotor punching sheets 10, and through the arrangement, the supporting ribs 11 connect the rotor punching sheets 10 on two sides of the magnetic barrier through holes 12 to play a role in fixing.
It is understood that, for each of the magnetic barrier through holes 12, there are a plurality of support ribs 11 provided through each of the magnetic barrier through holes 12. The supporting ribs 11 penetrating through each magnetic barrier through hole 12 include at least one, so that the rotor sheets 10 on two sides of each magnetic barrier through hole 12 can be fixed.
When the motor is in a working state, if the rotating speed of the motor rotor is high, the generated centrifugal force is high, the requirement on the mechanical strength of the motor rotor is high, and under the condition, a plurality of support ribs 11 can be properly arranged aiming at each magnetic barrier through hole 12, so that a better fixing effect is achieved.
Further, the mechanical strength of the support rib 11 penetrating through the magnetic barrier through hole 12 of each rotor punching sheet 10 is higher than the preset strength. Since the support rib 11 is used for fixing, the support rib 11 needs to have a certain mechanical strength and can be kept unchanged under the action of force. The mechanical strength of each support rib 11 may be the same or different, but is higher than the preset strength. The preset strength may be determined according to actual requirements, for example, may be determined by assistance according to a centrifugal force generated when the motor rotates, or may be determined according to an empirical value, which is not particularly limited in the embodiment of the present invention.
When the rotor punching sheet does not comprise or basically does not comprise the permanent magnet grooves and the permanent magnets, the motor formed by the motor rotor is one of reluctance motors, and the d-axis reluctance and the q-axis reluctance are different by a plurality of magnetic barrier through holes punched in the silicon steel sheet of the motor rotor, so that the motor rotates.
Different from the above, when the rotor sheet includes the permanent magnet slots and the permanent magnets, the motor formed by the motor rotor is a kind of permanent magnet motor, and at this time, the permanent magnets provide magnetic flux, and torque is generated under the interaction of the magnetic field generated by the winding current of the motor stator and the motor rotor, so as to realize the rotation of the motor.
In a possible implementation manner, as shown in fig. 1, the rotor punching sheet 10 further includes permanent magnet slots and permanent magnets 14, where:
permanent magnet slots are connected to the magnetic barrier through holes 12, and the permanent magnet slots are used for placing permanent magnets 14.
The permanent magnet 14 is placed in the permanent magnet groove and then fixed on the motor rotor punching sheet 10. When the motor rotor punching sheet 10 rotates, the permanent magnet 14 rotates along with the motor rotor punching sheet 10. The permanent magnet 14 is an object capable of providing magnetic flux, and the permanent magnet 14 is arranged on the motor rotor punching sheet 10, so that the magnetic flux of the motor can be improved, and the working performance of the motor can be improved.
In actual production, one or more permanent magnets 14 may be disposed on each flux barrier through hole 12, or the permanent magnets 14 may not be disposed, and the number and size of the permanent magnets 14 on each flux barrier through hole 12 may be set according to actual needs, which is not particularly limited in the embodiment of the present invention.
Further, each rotor sheet 10 further includes a plurality of ventilation holes 15, wherein the ventilation holes 15 on each rotor sheet 10 may or may not be aligned to each other. The number of the vent holes 15 on each rotor punching sheet 10 is one or more, and the number of the vent holes 15 on each rotor punching sheet 10 can be equal or unequal. For a plurality of ventilation holes 15 on one motor rotor punching sheet 10, the size and the shape of each ventilation hole 15 may be the same or different, and so on.
The ventilation holes 15 are provided on the one hand to reduce the weight of the rotor of the electric machine. Because the motor is in normal work, the motor rotor is in high-speed rotation, so the weight of the motor rotor is reduced, the load of the motor rotor can be reduced, the force of the motor rotor rotation cost is smaller, partial energy can be saved, and the influence on the mechanical structure of the motor rotor can be reduced.
Furthermore, the ventilation holes 15 are arranged to dissipate heat from the motor rotor rotating at high speed, so as to reduce the temperature of the motor rotor during rotation. Motor rotor is at the during operation, because continuous rotation, the production heat energy that can not stop to make motor rotor's temperature rise, and the high temperature also can produce adverse effect to the performance of motor, consequently, through setting up one or more ventilation hole 15, make giving out that heat energy that motor rotor produced can be timely, do benefit to the performance that improves the motor and alleviate motor rotor's load. When the cooling structure is used for heat dissipation, the ventilation holes 15 in each rotor punching sheet 10 can be arranged just opposite to each other, so that one or more ventilation paths are formed, the motor rotor is cooled, and a better heat dissipation effect is achieved.
The motor rotor provided by the embodiment of the invention comprises a plurality of rotor punching sheets and supporting ribs, wherein each rotor punching sheet is provided with a magnetic barrier through hole in a preset shape, the rotor punching sheets are stacked, the magnetic barrier through holes on the rotor punching sheets are arranged oppositely, the supporting ribs are arranged in the magnetic barrier through holes of the rotor punching sheets in a penetrating mode, the side edges of the supporting ribs are fixedly connected with the rotor punching sheets respectively, and the supporting ribs are not magnetic conductive. According to the scheme provided by the embodiment of the invention, no magnetic isolation bridge is required to be additionally arranged for the permanent magnet motor or the reluctance motor. For the permanent magnet motor, the no-load magnetic leakage coefficient can be adjusted by arranging the magnetic barrier through holes, so that the performance of the permanent magnet motor is improved, meanwhile, the support ribs are arranged in the magnetic barrier through holes of each rotor punching sheet in a penetrating manner, so that the mechanical strength of a motor rotor is improved, and meanwhile, the support ribs are made of materials which are not magnetic and have certain strength, so that the no-load magnetic leakage coefficient of the permanent magnet motor cannot be influenced, and the contradiction between the no-load magnetic leakage coefficient of the permanent magnet motor and the mechanical strength of the rotor is solved; for the corresponding reluctance motor, the mechanical strength of the motor rotor can be improved by arranging the support ribs, so that the problem that the salient pole ratio of the reluctance motor is reduced by arranging a wider magnetic isolation bridge is avoided, and the contradiction between the salient pole ratio and the mechanical strength of the rotor in the reluctance motor is solved. Therefore, the scheme provided by the embodiment of the invention can improve the mechanical strength of the rotor on the premise of not arranging the magnetic isolation bridge, thereby solving the problem that the mechanical strength of the rotor is reduced due to thinning the magnetic isolation bridge in the prior art and achieving better effect.
The motor rotor is a part of the motor, and a complete motor not only comprises the motor rotor, but also comprises the motor stator, wherein the motor rotor is a part which rotates at a high speed when the motor is in a working state, and correspondingly, the motor stator is a part which does not rotate at all when the motor is in the working state. The structure of the motor will be described with reference to fig. 3.
Fig. 3 is a schematic structural diagram of a motor according to an embodiment of the present invention, as shown in fig. 3, including a motor stator and a motor rotor as described above, where:
the motor rotor comprises a plurality of punched rotor punching sheets 10, each rotor punching sheet 10 is provided with one or more magnetic barrier through holes 12 in a preset shape, and the magnetic barrier through holes 12 on the plurality of rotor punching sheets 10 are arranged oppositely;
further, still include brace rod 11 among the electric motor rotor, brace rod 11 wears to establish in the magnetic barrier through-hole 12 between rotor punching 10, and the side of brace rod 11 respectively with every rotor punching 10 fixed connection, brace rod 11 is the material of a non-magnetic conduction and makes, and brace rod 11 possesses certain mechanical strength and hardness.
In practice, the manner and position of insertion of the support rib 11 into the magnetic barrier through hole 12 are arbitrary, and the structure of the support rib 11 is arbitrary. After the plurality of rotor punching sheets 10 are punched to form the motor core, the support ribs 11 are inserted into the motor core in any structure, any mode and any position to enhance the strength of the motor rotor.
As shown in fig. 3, the motor further includes a rotating shaft 13, a motor rotor pressing plate 31 and a permanent magnet baffle 32, and a permanent magnet baffle pressing ring 33 is disposed on the outer side of the permanent magnet baffle 32, where the motor rotor pressing plate is disposed at two ends of the motor rotor for fixing the motor rotor, and the permanent magnet baffle is disposed at two ends of the permanent magnet 14 for fixing the permanent magnet 14 when the permanent magnet 14 is placed on the permanent magnet slot of the motor rotor punching sheet 10.
Through the fixation of the motor rotor pressing plate to the motor rotor and the fixation of the permanent magnet baffle plate to the permanent magnet 14, when the motor rotor rotates at a high speed, the motor rotor and the permanent magnet 14 can not move as much as possible, and the normal rotation of the motor rotor and the normal work of the motor are ensured.
The motor provided by the embodiment of the invention comprises a motor rotor and a motor stator, wherein the motor rotor comprises a plurality of rotor punching sheets and supporting ribs, each rotor punching sheet is provided with a magnetic barrier through hole in a preset shape, the plurality of rotor punching sheets are stacked, the magnetic barrier through holes in the plurality of rotor punching sheets are arranged oppositely, the supporting ribs are arranged in the magnetic barrier through holes of each rotor punching sheet in a penetrating mode, the side edges of the supporting ribs are respectively fixedly connected with each rotor punching sheet, and the supporting ribs are not magnetic. According to the scheme provided by the embodiment of the invention, no magnetic isolation bridge is required to be additionally arranged for the permanent magnet motor or the reluctance motor. For the permanent magnet motor, the no-load magnetic leakage coefficient can be adjusted by arranging the magnetic barrier through holes, so that the performance of the permanent magnet motor is improved, meanwhile, the support ribs are arranged in the magnetic barrier through holes of each rotor punching sheet in a penetrating manner, so that the mechanical strength of a motor rotor is improved, and meanwhile, the support ribs are made of materials which are not magnetic and have certain strength, so that the no-load magnetic leakage coefficient of the permanent magnet motor cannot be influenced, and the contradiction between the no-load magnetic leakage coefficient of the permanent magnet motor and the mechanical strength of the rotor is solved; for the corresponding reluctance motor, the mechanical strength of the motor rotor can be improved by arranging the support ribs, so that the problem that the salient pole ratio of the reluctance motor is reduced by arranging a wider magnetic isolation bridge is avoided, and the contradiction between the salient pole ratio and the mechanical strength of the rotor in the reluctance motor is solved. Therefore, the scheme provided by the embodiment of the invention can improve the mechanical strength of the rotor on the premise of not arranging the magnetic isolation bridge, thereby solving the problem that the mechanical strength of the rotor is reduced due to thinning the magnetic isolation bridge in the prior art and achieving better effect.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides an electric motor rotor which characterized in that includes a plurality of rotor punching and brace rod, wherein:
each rotor punching sheet is provided with a magnetic barrier through hole in a preset shape;
the rotor punching sheets are stacked, and the magnetic barrier through holes on the rotor punching sheets are arranged oppositely;
the supporting ribs penetrate through magnetic barrier through holes between the rotor punching sheets, the side edges of the supporting ribs are fixedly connected with each rotor punching sheet respectively, and the supporting ribs do not conduct magnetism.
2. An electric machine rotor as claimed in claim 1, characterized in that the mechanical strength of the support ribs is higher than a preset strength.
3. The electric machine rotor as recited in claim 1, wherein, for each of the flux barrier through-holes, the support rib provided through each of the flux barrier through-holes is plural.
4. The motor rotor as recited in claim 1, wherein the rotor sheet includes a plurality of ventilation holes therein, the ventilation holes being configured to reduce a weight of the motor rotor and reduce a temperature of the motor rotor during rotation.
5. The electric machine rotor as recited in claim 1, further comprising a shaft centrally disposed on the electric machine rotor about which the electric machine rotor rotates.
6. The electric machine rotor of any of claims 1-5, further comprising permanent magnet slots and permanent magnets on the rotor blades, wherein:
the permanent magnet groove is connected with the magnetic barrier through hole and used for placing the permanent magnet.
7. An electric machine comprising a machine stator and a machine rotor according to any of claims 1-6.
8. The electric machine of claim 7, further comprising a machine rotor platen, wherein:
the motor rotor pressing plates are arranged at two ends of the motor rotor and used for fixing the motor rotor.
9. The electric machine of claim 7, further comprising a permanent magnet shield for:
when the permanent magnet is placed in the permanent magnet groove of the rotor punching sheet, the permanent magnet is arranged at two ends of the permanent magnet and used for fixing the permanent magnet.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895250.9A CN112542910A (en) | 2019-09-20 | 2019-09-20 | Motor rotor and motor |
| PCT/CN2019/109222 WO2021051451A1 (en) | 2019-09-20 | 2019-09-29 | Motor rotor and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895250.9A CN112542910A (en) | 2019-09-20 | 2019-09-20 | Motor rotor and motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112542910A true CN112542910A (en) | 2021-03-23 |
Family
ID=74884400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910895250.9A Pending CN112542910A (en) | 2019-09-20 | 2019-09-20 | Motor rotor and motor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN112542910A (en) |
| WO (1) | WO2021051451A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696495A (en) * | 2022-05-07 | 2022-07-01 | 南京晓庄学院 | Mixed laminated rotor structure for improving stability of working point of permanent magnet |
| US11863109B2 (en) | 2020-03-13 | 2024-01-02 | Crrc Yongji Electric Co., Ltd. | Method and device for adjusting permanent magnet motor, equipment, and storage medium |
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| CN114696495B (en) * | 2022-05-07 | 2023-06-30 | 南京晓庄学院 | Mixed lamination type rotor structure for improving stability of permanent magnet working point |
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|---|---|
| WO2021051451A1 (en) | 2021-03-25 |
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