CN111092501A - Rotor device and reluctance motor having the same - Google Patents

Rotor device and reluctance motor having the same Download PDF

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Publication number
CN111092501A
CN111092501A CN201811475004.XA CN201811475004A CN111092501A CN 111092501 A CN111092501 A CN 111092501A CN 201811475004 A CN201811475004 A CN 201811475004A CN 111092501 A CN111092501 A CN 111092501A
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rotor core
flux barrier
rotor
barrier
flux
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CN111092501B (en
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林永祥
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Lidashi Industry Co ltd
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Taiwan Electric Manufacturing Technology Co ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2706Inner rotors
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

A rotor device includes a body unit, and a plurality of barrier units. The body unit comprises a rotor core and a main shaft penetrating through the rotor core, the barrier units are evenly arranged on the rotor core in a surrounding mode and are arranged at intervals, each barrier unit comprises at least two magnetic flux barrier grooves arranged at intervals and penetrating through the rotor core and at least one magnetic flux channel located between every two adjacent magnetic flux barrier grooves, and the middle thickness of the magnetic flux barrier groove closest to the center of the rotor core is larger than the thicknesses of the two ends of the magnetic flux barrier groove.

Description

Rotor device and reluctance motor having the same
Technical Field
The present invention relates to a rotor device, and more particularly, to a rotor device and a reluctance motor having the same.
Background
With the increasing demand of automated manufacturing equipment, the electric motor plays a critical role as the main driving device of the manufacturing equipment, and among several motor structures, the most common is the induction motor, and the permanent magnet motor and the reluctance motor have the advantages of simple structure, high efficiency, and the like, so that they are gradually paid attention and gradually develop towards improving energy efficiency.
Since the rotor of the permanent magnet motor is made of magnetic material, the rotor has no induced current, and although the efficiency is high, the yield of the used good magnetic material (such as rare earth) is rare and the price is high, so that the permanent magnet motor is not easy to be used in large quantities in the industry.
The anti-magnetic reluctance motor is different from an induction motor and a permanent magnet motor which operate by adopting Lorentz force, the magnetic reluctance motor operates by utilizing magnetic reluctance force, namely, when magnetic lines of force form a closed loop in space, the magnetic lines of force select a path with the lowest magnetic reluctance, so when a rotor is arranged in a stator magnetic field, the magnetic lines of force drive the rotor to move to a position with the lowest magnetic reluctance, the maximum and minimum magnetic reluctance difference is generated through the magnetic reluctance of a d-q axis of the rotor, so as to generate magnetic reluctance torque, and because the rotating magnetic fields of the rotor and the stator rotate synchronously, no induction current exists, no secondary copper loss exists, so that the energy conversion efficiency is high, the environmental issues caused by oil-electricity double expansion and greenhouse effect are solved, the energy conservation becomes a global urgent issue, and the application of the industrial induction motor and the rare earth permanent magnet motor is replaced by the magnetic reluctance motor.
In order to improve the torque utilization rate of the reluctance motor in the prior art, the larger the d-axis inductance is, the smaller the q-axis inductance is, and in order to increase the reluctance difference, the q-axis magnetic flux needs to be effectively blocked so as to reduce the q-axis inductance, however, the smaller the number of barriers arranged in the rotor or the smaller the space of the barriers, the smaller the reluctance of the barriers is, and the torque of the rotor is further reduced; if the number of barriers or spaces is increased, the structural strength of the rotor is deteriorated, and the rotor is easily deformed at high-speed rotation, which needs to be improved.
The above-mentioned disadvantages all show the problems of the conventional reluctance motor in use, which often results in the disadvantages of not improving the use efficiency and structural strength of the object for a long time, so the prior art really needs to provide a better solution.
Disclosure of Invention
Accordingly, the present invention is directed to a rotor apparatus including a body unit and four barrier units.
The body unit comprises a rotor core and a main shaft penetrating through the rotor core, the four barrier units are evenly arranged on the rotor core in a surrounding mode and are arranged at intervals, each barrier unit comprises at least two magnetic flux barrier grooves arranged at intervals and penetrating through the rotor core and at least one magnetic flux channel located between every two adjacent magnetic flux barrier grooves, and the middle thickness of the magnetic flux barrier groove closest to the center of the rotor core is larger than the thicknesses of the two ends of the magnetic flux barrier groove.
Another technical means of the present invention is that the barrier units define a d-axis located between two adjacent barrier units and a q-axis passing through the center of the flux barrier groove, the diameter of a circle circumscribed by the circle center of the rotor core and the q-axes of the four flux barrier grooves closest to the circle center along the outermost edge circumferential direction is Rd1, the diameter of the rotor core is Rd2, and Rd1 and Rd2 satisfy the relation of 0.35 ≦ Rd1/Rd2 ≦ 0.55.
Another technical means of the present invention is that the number of the flux barrier grooves is 2 to 5, and when the number of the flux barrier grooves is 2, the sum of the thicknesses of the middle portions of the two flux barrier grooves is defined as F ', the distance between the flux paths between two adjacent flux barrier grooves is I', and F 'satisfy the relation of 0.8 ≦ I'/F ≦ 1.15; when the number of the flux barrier grooves is 3-5, the sum of the thicknesses of the middle parts of all the flux barrier grooves is defined as F, the sum of the distances of all the flux channels between two adjacent flux barrier grooves is I, and I, F satisfies the relation that I/F is less than or equal to 0.8 and less than or equal to 1.15.
The present invention has another technical means that the middle thickness of the magnetic flux barrier groove closest to the center of the rotor core is greater than the middle thickness of the magnetic flux barrier groove farthest from the center of the rotor core, and the distance between the magnetic flux channels in the two magnetic flux barrier grooves is the same.
Another technical means of the present invention is that the two ends of each flux barrier groove are substantially arc-shaped, and each barrier unit further includes a connecting rib connecting the plurality of flux barrier grooves and located on the q-axis for increasing the structural strength of the rotor core.
In another aspect of the present invention, when the diameter of the rotor core is greater than 60mm, the width between the ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.3 mm.
The present invention further provides a technical means that when the diameter of the rotor core is greater than 100mm, the width between the two ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.4 mm.
Another technical means of the present invention is that when the diameter of the rotor core is larger than 130mm, the width between the two ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.5 mm.
In another aspect of the present invention, when the diameter of the rotor core is larger than 160mm, the width between the ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.6 mm.
Still another technical means of the present invention is to provide a reluctance motor including a stator device having a stator core and distributed windings wound around the stator core, and a rotor device installed inside the stator device.
The present invention has the beneficial effects that the middle thickness of the magnetic flux barrier groove closest to the center of the rotor core is larger than the thicknesses of the two ends, and the middle thickness of the magnetic flux barrier groove closest to the center of the rotor core is larger than the middle thickness of the magnetic flux barrier groove farthest from the center of the rotor core, so as to reduce the torque ripple of the motor, further suppress the vibration noise, and shorten the widths of the two ends of the magnetic flux barrier groove and the outer edge of the rotor core, thereby obtaining the maximum motor characteristic, and simultaneously not increasing the torque ripple of the motor, so that the efficiency of the motor reaches the highest level, further achieving the purpose of saving cost and realizing mass production.
Drawings
FIG. 1 is a front view schematically illustrating a preferred embodiment of a rotor apparatus and a reluctance motor having the rotor apparatus according to the present invention;
FIG. 2 is a partially enlarged view illustrating an arrangement of barrier rib units in the present preferred embodiment;
FIG. 3 is a front view schematically illustrating the combination of the stator assembly and the rotor assembly in the preferred embodiment;
FIG. 4 is a schematic view illustrating the simulation result of the diameter of the circumscribed circle and the diameter of the rotor core against the torque in the present preferred embodiment;
FIG. 5 is a diagram illustrating the simulation results of the diameter of the circumscribed circle and the diameter of the rotor core against torque ripple in the preferred embodiment;
FIG. 6 is a diagram illustrating the torque simulation results of the sum of all the flux path distances between two adjacent flux barrier grooves and the sum of the thicknesses of the middle portions of all the flux barrier grooves in the preferred embodiment; and
fig. 7 is a diagram illustrating a simulation result of the sum of all the flux path distances between two adjacent flux barrier grooves and the sum of the thicknesses of the middle portions of all the flux barrier grooves on the torque ripple in the present preferred embodiment.
Detailed Description
The features and technical content of the related applications of the present invention will become apparent from the following detailed description of the preferred embodiments, which is to be read in connection with the accompanying drawings.
Referring to fig. 1 and 2, a rotor device and a reluctance motor having the same according to the present invention includes a body unit 3 and a plurality of barrier units 5.
It is noted that reluctance motor torque is generated mainly by reluctance difference between d-q axes of the rotor device, and herein, the barrier unit 5 is defined to have a d axis between two adjacent barrier units 5 and a q axis passing through the center of the flux barrier groove 51, the d axis is a direction in which a salient magnetic field of the rotor device extends, and the q axis is a direction in which a magnetic field connecting between adjacent salient poles and salient poles extends. The torque equation of the reluctance motor in synchronous rotation coordinates can be expressed as:
Figure BDA0001891955720000051
in the above equation, T is the electromagnetic torque of the reluctance motor, P is the number of rotor poles, Ld and Lq are d and q axis inductances, and id and iq are the components of the stator current in the space vector in the d and q axis directions. As can be seen from the formula, the reluctance motor has a characteristic that the inductance-dependent difference (Ld-Lq) is the largest. The output torque of the motor can be increased by increasing the d-axis inductance or decreasing the q-axis inductance. Therefore, the inductance difference is one of the most important parameters affecting the operation performance of the reluctance motor.
The main body unit 3 includes a rotor core 31 and a main shaft 32 passing through the rotor core 31. The rotor core 31 is formed by stacking, welding, fixing, automatically riveting, and pressure-fitting a plurality of magnetic silicon steel sheets, or is an integrally formed member, made of steel plates, silicon steel sheets, Soft Magnetic Composites (SMC), or other magnetic materials. Thus, a method for improving the efficiency of reluctance motor by quickly achieving the maximum utilization of torque and lower torque ripple is provided.
The plurality of barrier rib units 5 are evenly arranged on the rotor core 31 in a surrounding and spaced manner, each barrier rib unit 5 includes at least two flux barrier grooves 51 arranged in a spaced manner and penetrating through the rotor core 31, and at least one flux channel 52 located between two adjacent flux barrier grooves 51.
Wherein, the middle thickness 23 of the magnetic flux barrier groove 51 closest to the center of the rotor core 31 is larger than the thicknesses of the two ends, that is, the magnetic flux barrier groove 51 closest to the center of the rotor core 31 passes through the center of the magnetic flux barrier groove 51 from the q-axis to the left and right ends of the magnetic flux barrier groove 51, and presents a smaller state for reducing the motor torque ripple, thereby suppressing the vibration noise of the operation.
Further, the middle thickness 23 of the flux barrier groove 51 closest to the center of the rotor core 31 is greater than the middle thickness 23 of the flux barrier groove 51 farthest from the center of the rotor core 31, and when there are a plurality of flux barrier grooves 51, the design is a gradual thickness from thick to thin, through which the motor torque ripple can be reduced to suppress the vibration noise, and the distance between each flux channel 52 between two flux barrier grooves 51 is the same.
Furthermore, the two ends of each magnetic barrier groove 51 are generally arc-shaped, which not only improves the manufacturing quality, but also prolongs the service life of the mold, thereby achieving the purpose of mass production.
Herein, a diameter 21 of a circle circumscribed by a circle center of the rotor core 31 along a circumferential direction of an outermost edge and q axes of the four flux barrier grooves 51 closest to the circle center is defined as Rd1, a diameter 22 of the rotor core is defined as Rd2, in the preferred embodiment, the number of the barrier units 5 is four, and Rd1 and Rd2 satisfy a relation of 0.35 ≦ Rd1/Rd2 ≦ 0.55.
Further, the number of the flux barrier grooves 51 is 2 to 5, and as shown in fig. 1 to 3, the number of the flux barrier grooves 51 is 3, and the number of the flux paths 52 is 2. When the number of the flux barrier grooves 51 is 2 and the number of the flux paths 52 is 1, the sum of the thicknesses 23 of the middle portions of the two flux barrier grooves 51 is defined as F ', the distance 24 of the flux path 52 between the two adjacent flux barrier grooves 51 is defined as I', and the relation of 0.8 ≦ I '/F' ≦ 1.15 is satisfied, and when the number of the flux barrier grooves 51 is 3, the sum of the thicknesses 23 of the middle portions of all the flux barrier grooves 51 is defined as F, the sum of the distances 24 of all the flux paths 52 between the two adjacent flux barrier grooves 51 is defined as I, and I, F also satisfies the relation of 0.8 ≦ I/F ≦ 1.15.
Wherein, when the diameter 22 of the rotor core 31 is larger than 60mm, the width of the two side ends of the flux barrier groove 51 and the outer edge of the rotor core 31 is not less than 0.3 mm.
Wherein, when the diameter 22 of the rotor core 31 is larger than 100mm, the width of the two side ends of the flux barrier groove 51 and the outer edge of the rotor core 31 is not less than 0.4 mm.
Wherein, when the diameter 22 of the rotor core 31 is larger than 130mm, the width of the two side ends of the flux barrier groove 51 and the outer edge of the rotor core 31 is not less than 0.5 mm.
Wherein, when the diameter 22 of the rotor core 31 is larger than 160mm, the width of the two side ends of the flux barrier groove 51 and the outer edge of the rotor core 31 is not less than 0.6 mm.
When the diameter 22 of the rotor core 31, and the widths of both side ends of the flux barrier groove 51 and the outer edge of the rotor core 31 are the same as the above, problems of manufacturing accuracy and structural strength during rotor operation can be avoided.
The thinner the width of the end of the magnetic flux barrier groove 51 on both sides and the outer edge of the rotor core 31 is, the maximum motor characteristics can be obtained.
Preferably, each barrier rib unit 5 further includes a connection rib 53 connecting the plurality of flux barriers 51 and located on the q-axis for increasing the structural strength of the rotor core 31. In addition, the magnetic barrier groove 51 can be filled with a non-magnetic medium of thermoplastic or thermosetting for maintaining the dynamic balance of operation.
Referring to fig. 3, a reluctance motor having the above-mentioned rotor assembly includes a stator assembly 7 having a stator core 71 and distributed windings 72 wound on the stator core 71, wherein the stator assembly 7 and the rotor assembly are spaced apart to operate synchronously.
Based on the above structural description, simulation software is used to perform result verification, and referring to fig. 4 and 5, simulation waveforms of the diameter 21 of the circumscribed circle and the diameter 22 of the rotor core with respect to torque and torque ripple are shown, respectively. Here, fig. 4 to 6 are simulations using barrier cells 5 of 4 flux barrier grooves 51 and 3 flux channels 52. By adjusting the ratio of Rd1 to Rd2, the present invention enables the motor to generate the maximum output power (torque N-m), as can be seen from FIG. 4, the maximum torque range is between 0.2 and 0.55. In addition to selecting the maximum output power, the motor needs to have low noise when operating, and the torque ripple of the synchronous motor is closely related to the vibration noise of the motor, as can be seen from fig. 5, the optimal region of the torque ripple (%) is between 0.35 and 0.55. In order to maximize the output power and minimize the vibration noise of the motor, 0.35-0.55 is the optimum value and satisfies the relation 0.35 ≦ Rd1/Rd2 ≦ 0.55.
Referring to fig. 6 and 7, the simulated waveforms of the sum of the distances 24 of all the flux paths 52 between two adjacent flux barrier grooves 51 and the sum of the thicknesses 23 of the middle portions of all the flux barrier grooves 51 versus the torque are shown, respectively. As can be seen from fig. 6, the maximum torque range is between 0.8 and 1.3, and as can be seen from fig. 7, the torque ripple optimum range is between 0.7 and 1.15, considering the maximum output power and the minimum vibration noise of the motor, therefore, 0.8 to 1.15 are the optimum values and satisfy the relation of 0.8 ≦ I/F ≦ 1.15.
The rotor device with different numbers of barrier rib units 5 has great influence on the output torque and output power of the motor, in the preferred embodiment, four barrier rib units 5 are used to obtain higher output power and efficiency when applied to the rotation speed above 1800RPM, and it should be noted that the above description of the rotation speed above 1800RPM is only for illustration and should not be taken as a limitation to the scope of the present invention.
In summary, the rotor apparatus and the reluctance motor having the same according to the present invention are configured such that the body unit 3 and the barrier units 5 are mutually arranged, the thickness 23 of the middle of the magnetic flux barrier groove 51 closest to the center of the rotor core 31 is larger than the thickness of the two ends, and the middle thickness 23 of the flux barrier groove 51 closest to the center of the rotor core 31 is larger than the middle thickness 23 of the flux barrier groove 51 farthest from the center of the rotor core 31 for reducing the motor torque ripple, further, vibration noise is suppressed, and the width of the end portions on both sides of the magnetic flux barrier groove 51 and the outer edge of the rotor core 31 is shortened, thereby obtaining the maximum motor characteristics, at the same time, the optimum design of torque ripple of the motor will not be increased, so that the efficiency of the motor reaches the highest level, thereby achieving the purpose of saving cost and mass production, and thus the purpose of the present invention can be achieved.
However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the description of the present invention are still within the scope of the present invention.
Description of the symbols
21 diameter
22 diameter
23 thickness
24 distance
3 body unit
31 rotor core
32 spindle
5 barrier rib unit
51 flux barrier groove
52 magnetic flux path
53 connecting rib
7 stator device
71 stator core
72 distributed winding

Claims (10)

1. A rotor device, comprising
The body unit comprises a rotor core and a main shaft penetrating through the rotor core; and
the magnetic barrier unit comprises four barrier units which are evenly arranged on the rotor core in a surrounding and spaced mode, each barrier unit comprises at least two magnetic flux barrier grooves which are arranged in a spaced mode and penetrate through the rotor core, and at least one magnetic flux channel located between every two adjacent magnetic flux barrier grooves, wherein the middle thickness of the magnetic flux barrier groove closest to the center of the rotor core is larger than the thicknesses of the two ends of the magnetic flux barrier groove.
2. The rotor apparatus of claim 1, wherein the barrier units define a d-axis between two adjacent barrier units and a q-axis passing through the center of the flux barrier groove, the center of the rotor core is circumscribed with the q-axes of the four flux barrier grooves closest to the center along the circumferential direction of the outermost edge, and the diameter of the rotor core is Rd1, the diameter of the rotor core is Rd2, and Rd1 and Rd2 satisfy the relation of 0.35 ≦ Rd1/Rd2 ≦ 0.55.
3. The rotor apparatus of claim 2, wherein the number of the flux barrier grooves is 2 to 5, and when the number of the flux barrier grooves is 2, the sum of the thicknesses of the middle portions of the two flux barrier grooves is defined as F ', and the distance between the flux paths between two adjacent flux barrier grooves is I ', I ' and F ' satisfy the relation of 0.8 ≦ I '/F ≦ 1.15; when the number of the flux barrier grooves is 3-5, the sum of the thicknesses of the middle parts of all the flux barrier grooves is defined as F, the sum of the distances of all the flux channels between two adjacent flux barrier grooves is I, and I, F satisfies the relation that I/F is less than or equal to 0.8 and less than or equal to 1.15.
4. The rotor apparatus according to claim 3, wherein a middle thickness of the flux barrier groove closest to the center of the rotor core is larger than a middle thickness of the flux barrier groove farthest from the center of the rotor core, and a pitch of each flux path between two flux barrier grooves is the same.
5. The rotor apparatus as claimed in claim 4, wherein the end of each of the flux barrier slots is substantially circular arc-shaped, and each of the barrier units further includes a connecting rib connecting the plurality of flux barrier slots and located on the q-axis for increasing the structural strength of the rotor core.
6. The rotor apparatus of claim 5, wherein when the diameter of the rotor core is greater than 60mm, the width of both side ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.3 mm.
7. The rotor apparatus of claim 6, wherein when the diameter of the rotor core is greater than 100mm, the width of both side ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.4 mm.
8. The rotor apparatus of claim 7, wherein when the diameter of the rotor core is larger than 130mm, the width of both side ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.5 mm.
9. The rotor apparatus of claim 8, wherein when the diameter of the rotor core is greater than 160mm, the width of both side ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.6 mm.
10. A reluctance motor comprising a stator means having a stator core and distributed windings wound around said stator core, and a rotor means according to any one of claims 1 to 9 and disposed inside said stator means.
CN201811475004.XA 2018-10-24 2018-12-04 Rotor device and reluctance motor having the same Active CN111092501B (en)

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CN112510869A (en) * 2020-11-25 2021-03-16 中车永济电机有限公司 Novel synchronous reluctance motor rotor

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Publication number Priority date Publication date Assignee Title
CN1728505A (en) * 2004-07-26 2006-02-01 乐金电子(天津)电器有限公司 Combination of rotor in synchronous inductive reluctance motor
CN106104970A (en) * 2014-01-31 2016-11-09 西门子公司 There is the reluctance rotor lamination of depressed part for reducing stress
EP3082225A1 (en) * 2015-04-14 2016-10-19 Ge Avio S.r.l. Method for designing a rotor structure of a synchronous reluctance electric machine, and corresponding rotor for a synchronous reluctance electric machine
CN204615530U (en) * 2015-05-12 2015-09-02 河北工业大学 A kind of ALA rotor structure of synchronous magnetic resistance motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112510869A (en) * 2020-11-25 2021-03-16 中车永济电机有限公司 Novel synchronous reluctance motor rotor

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