TW202017277A - Rotor device and reluctance motor having the rotor device - Google Patents

Abstract

A rotor device includes a body and multiple obstructions. The body comprises a rotator core and an axle passing through the rotator core. The obstructions are uniformly positioned around the rotator core and each comprises at least two magnetic flux barriers and at least one magnetic flux channel, the magnetic flux barriers pass through the rotator core, each magnetic flux channel is positioned between any two adjacent magnetic flux barriers, and the intermediate thickness of the magnetic flux barrier closest to the center of the rotator core is greater than the periphery thickness thereof.

Description

Rotor device and magnetic resistance with the rotor device motor

The invention relates to a rotor device, in particular to a rotor device and a reluctance motor with the rotor device.

With the increasing demand for automated production equipment, motors play a key role as the main driving device of production equipment. Among the several motor architectures, the most common are induction motors, while permanent magnet motors and reluctance motors have The advantages of simple structure and high efficiency have gradually attracted attention, and they are also gradually moving towards improving energy efficiency.

Because the rotor of the permanent magnet motor is a magnetic material, the rotor has no induced current. Although the efficiency is high, the production of good magnetic materials using rare earth is scarce and expensive, making it difficult for the permanent magnet motor to be widely used by industry.

In contrast, reluctance motors are different from induction motors and permanent magnet motors that use Lorentz force. Reluctance motors use magnetic resistance to operate, that is, when a closed loop is formed in the space with magnetic lines, the magnetic lines will choose to go away. The path with the lowest resistance, so when the rotor is placed in the stator magnetic field, the magnetic force lines will drive the rotor to its lowest reluctance position. As the rotating magnetic field of the rotor and stator rotates synchronously, there is no induced current and no secondary copper loss, so the energy conversion efficiency is high. In the environmental issues brought by the double rise of oil and electricity and the greenhouse effect, energy saving has become an urgent issue worldwide. Therefore, the reluctance motor replaces the application of industrial induction motor and rare earth permanent magnet motor.

The prior art reluctance motor is used to increase torque Rate, the d-axis inductance needs to be larger and the q-axis inductance smaller. In order to increase the magnetic resistance difference, the q-axis magnetic flux needs to be effectively blocked to reduce the q-axis inductance. However, the number of barriers provided in the rotor is small or the barrier If the space is small, the magnetic resistance of the barrier will be reduced, which will reduce the torque of the rotor; if the number or space of the barrier is increased, the structural strength of the rotor will be deteriorated, and the rotor will be easily deformed when rotating at high speed. Need to be improved.

The above-mentioned shortcomings all show the various problems arising from the use of conventional reluctance motors. Over a long period of time, they often result in the lack of efficiency and structural strength of objects. Therefore, the prior art does need to propose a better solution.

In view of this, the object of the present invention is to provide a rotor device including a body unit and four barrier units.

The body unit includes a rotor core, and a main shaft penetrating the rotor core. The four barrier units are evenly spaced and spaced on the rotor core. Each barrier unit includes at least two intervals and penetrates the The magnetic flux barrier groove of the rotor core and at least one magnetic flux channel between 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 greater than the thickness at both ends.

Another technical means of the present invention is that the above-mentioned barrier unit defines a d-axis located between two adjacent barrier units, and a q-axis passing through the center position of the magnetic flux barrier slot, the center of the rotor core The diameter of the circumscribed circle along the q axis of the four magnetic flux barrier grooves closest to the center circle along the outermost edge is Rd1, and the diameter of the rotor core is Rd2. Rd1 and Rd2 satisfy 0.35≦Rd1/Rd2≦0.55 Relationship.

Another technical means of the present invention is that the number of the above-mentioned magnetic flux barrier grooves is 2 to 5. When the number of the magnetic flux barrier grooves is 2, the sum of the thicknesses of the middle portions of the two magnetic flux barrier grooves is defined as F', the flux path distance between two adjacent flux barrier grooves is I', and I'and F'satisfy 0.8≦I′/F′≦1.15; when the number of flux barrier grooves is 3~5, define the sum of the thickness of the middle part of all flux barrier grooves as F, the The sum of the distances of all magnetic flux channels is I, and I and F satisfy the relationship of 0.8≦I/F≦1.15.

Another technical means of the present invention is that the middle thickness of the flux barrier grooves closest to the center of the rotor core is greater than the middle thickness of the flux barrier grooves farthest from the center of the rotor core, and each is located The distance between the magnetic flux channels between the two magnetic flux barrier grooves is the same.

Another technical means of the present invention is that the shape of the two ends of each of the magnetic flux barrier grooves described above is generally arc-shaped, and each barrier unit further includes a plurality of magnetic flux barrier grooves connected on the q axis The connecting rib is used to increase the structural strength of the rotor core.

Another technical means of the present invention is that when the diameter of the rotor core is greater than 60 mm, the width of the two ends of the magnetic flux barrier groove and the outer edge of the rotor core is not less than 0.3 mm.

Another technical means of the present invention is that when the diameter of the rotor core is greater than 100 mm, the width of the two ends of the magnetic 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 greater than 130 mm, the width of the two ends of the magnetic flux barrier groove and the outer edge of the rotor core is not less than 0.5 mm.

Another technical means of the present invention is that when the diameter of the rotor core is greater than 160 mm, the width of the two ends of the magnetic 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, which includes a stator device having a stator core and distributed windings wound on the stator core, and a rotor device installed inside the stator device .

The beneficial effect of the present invention is that The center thickness of the flux barrier wall slot of the center of the daughter core is greater than the thickness of both ends, and the center thickness of the flux barrier wall slot closest to the center of the rotor core is greater than that of the flux barrier wall slot farthest from the center of the rotor core The middle thickness reduces the torque ripple of the motor, thereby suppressing the vibration noise. In addition, the width of the two ends of the magnetic flux barrier groove and the outer edge of the rotor core is shortened to obtain the maximum motor characteristics without Improve the torque ripple of the motor, so that the efficiency of the motor reaches the highest level, and then achieve the purpose of cost saving and mass production.

21‧‧‧Diameter

22‧‧‧Diameter

23‧‧‧thickness

24‧‧‧Distance

3‧‧‧Body unit

31‧‧‧Rotor core

32‧‧‧spindle

5‧‧‧ Barrier unit

51‧‧‧flux barrier groove

52‧‧‧flux channel

53‧‧‧ connection rib

7‧‧‧ Stator device

71‧‧‧ Stator core

72‧‧‧ distributed winding

FIG. 1 is a schematic front view illustrating a preferred embodiment of the rotor device of the present invention and a reluctance motor having the rotor device; FIG. 2 is a partially enlarged view illustrating the arrangement of a barrier unit in the preferred embodiment; FIG. 3 is a schematic front view illustrating the combination of a stator device and a rotor device in the preferred embodiment; FIG. 4 is a schematic view illustrating the diameter of the circumscribed circle and the diameter of the rotor core in the preferred embodiment Torque simulation results; Figure 5 is a schematic diagram illustrating the simulation results of the torque ripple of the diameter of the circumscribed circle and the rotor core in the preferred embodiment; Figure 6 is a schematic diagram illustrating the preferred embodiment In the example, the sum of the distances of all the magnetic flux channels between two adjacent magnetic flux barrier grooves and the total thickness of the intermediate portions of all magnetic flux barrier grooves simulates the torque; and FIG. 7 is a schematic diagram illustrating the preferred embodiment. The result of the simulation of torque ripple is the sum of the distances of all the magnetic flux channels between the two adjacent flux barrier grooves and the thickness of the middle of all the flux barrier grooves.

Relevant patent application features and technical content of the present invention, in the following detailed description of preferred embodiments in conjunction with reference drawings, will Can be clearly presented.

Referring to FIGS. 1 and 2, it is a preferred embodiment of the rotor device and the reluctance motor having the rotor device of the present invention. The rotor device includes a body unit 3 and a plurality of barrier units 5.

Here, it is first explained that the method of generating torque of the reluctance motor mainly generates the reluctance torque through the reluctance difference of the dq axis of the rotor device. Here, the barrier unit 5 is defined as having two adjacent barrier units 5 The d-axis between them, and a q-axis passing from the central position of the flux barrier groove 51, further, the d-axis is the direction in which the salient pole magnetic field of the rotor device extends, and the q-axis is the connection between the adjacent salient pole and the salient pole The direction in which the magnetic field between poles extends. The torque equation of the reluctance motor can be expressed as:

In the above equation, T is the electromagnetic torque of the reluctance motor, P is the number of rotor poles, Ld and Lq are the inductances of the d and q axes, and id and iq are the components of the stator current in the space vector in the direction of the d and q axes. It can be seen from the formula that the reluctance motor has the characteristic of relying on the maximum inductance difference (Ld-Lq). Increasing the d-axis inductance or reducing the q-axis inductance can increase the output torque of the motor. Therefore, the inductance difference is one of the most important parameters that affect the running performance of the reluctance motor.

The body unit 3 includes a rotor core 31 and a main shaft 32 disposed on the rotor core 31. The rotor core 31 is made of steel plates, silicon steel sheets, soft magnetic composites (SMC) or other magnetically conductive materials, which are assembled by welding, fixing or automatically riveting and other press-fitting components through a plurality of magnetically conductive silicon steel sheets, or It is an integrally formed component. In this way, a method for quickly achieving maximum torque utilization and lower torque ripple to improve the efficiency of the reluctance motor is provided.

The plurality of barrier units 5 are evenly surrounded and spaced apart on the rotor core 31. Each barrier unit 5 includes at least two magnetic flux barrier grooves 51 spaced apart and penetrating the rotor core 31, and at least one located adjacent to each other The magnetic flux channel 52 between the two magnetic flux barrier grooves 51.

Among them, the middle thickness 23 of the magnetic flux barrier groove 51 closest to the center of the rotor core 31 is greater than the thickness at both ends, that is, the magnetic flux barrier groove 51 closest to the center of the rotor core 31 passes through the magnetic field from the q axis The center position of the through-barrier groove 51 to the left and right ends of the magnetic-flux barrier groove 51 is getting smaller and smaller, which is used to reduce the motor torque ripple, thereby suppressing the vibration noise of the operation.

Further, the intermediate thickness 23 of the magnetic flux barrier groove 51 closest to the center of the rotor core 31 is greater than the intermediate thickness 23 of the magnetic flux barrier groove 51 farthest from the center of the rotor core 31, and when there are a plurality of magnetic fluxes The barrier groove 51 is a progressive thickness design from thick to thin. Through this design, the motor torque ripple can be reduced to suppress vibration noise, and each of the magnetic flux channels 52 between the two magnetic flux barrier grooves 51 The spacing is the same.

Furthermore, the shapes of the ends of each side of each magnetic flux barrier groove 51 are generally arc-shaped, which can not only improve the manufacturing quality, but also extend the life of the mold, thereby achieving the purpose of mass production.

Here, the diameter 21 of the rotor core 31 is defined as an circumscribed circle along the outermost circumferential direction with the q-axis of the four magnetic flux barrier grooves 51 closest to the circle center as Rd1, and the diameter 22 of the rotor core is 22 It is Rd2. In the preferred embodiment, the number of the barrier units 5 is four, and Rd1 and Rd2 satisfy the relationship of 0.35≦Rd1/Rd2≦0.55.

Further, the number of the magnetic flux barrier grooves 51 is 2 to 5, as shown in FIGS. 1 to 3, the number of the magnetic flux barrier grooves 51 is 3, and the number of the magnetic flux channels 52 is 2. When the number of the magnetic flux barrier grooves 51 is two and the magnetic flux channel 52 is one, the sum of the thickness 23 of the middle part of the two magnetic flux barrier grooves 51 is defined as F′, and the two adjacent magnetic flux barrier grooves 51 The distance 24 between the magnetic flux channels 52 is I′, which satisfies the relationship of 0.8≦I′/F′≦1.15. When the number of the magnetic flux barrier grooves 51 is three, the thickness of the middle part of all the magnetic flux barrier grooves 51 is defined. The sum of 23 is F, two adjacent magnetic flux barrier grooves 51 The sum of the distances 24 of all the magnetic flux channels 52 between them is I, and I and F also satisfy the relationship of 0.8≦I/F≦1.15.

Wherein, when the diameter 22 of the rotor core 31 is greater than 60 mm, the width of the two ends of the magnetic 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 greater than 100 mm, the width of the two ends of the magnetic 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 greater than 130 mm, the width of the ends of both sides of the magnetic 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 greater than 160 mm, the width of the two ends of the magnetic 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 width of the ends of both sides of the magnetic flux barrier groove 51 and the outer edge of the rotor core 31 are as described above, the manufacturing accuracy and structural strength during rotor operation can be avoided And other issues.

When the widths of both ends of the magnetic flux barrier groove 51 and the outer edge of the rotor core 31 are thinner, the maximum motor characteristics can be obtained.

Preferably, each barrier unit 5 further includes a connecting rib 53 connected to the plurality of magnetic flux barriers 51 and located on the q-axis to increase the structural strength of the rotor core 31. In addition, the magnetic flux barrier groove 51 may be filled with a thermoplastic or thermosetting non-magnetic medium to maintain the dynamic balance of operation.

Referring to FIG. 3, it is a reluctance motor having the above-mentioned rotor device. The reluctance motor includes a stator device 7 having a stator core 71 and a distributed winding 72 wound on the stator core 71, wherein the stator device 7 Set at intervals with the rotor device to run synchronously.

According to the above structure description, the simulation software is used to verify the results. With reference to FIGS. 4 and 5, the simulation waveforms of the torque 21 and the torque ripple of the diameter 21 of the circumscribed circle and the diameter 22 of the rotor core are respectively shown. Here, FIGS. 4 to 6 are simulations of the barrier unit 5 using four magnetic flux barrier grooves 51 and three magnetic flux channels 52. According to the present invention, by adjusting the ratio of Rd1 and Rd2, the motor can 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 must also be operated with low noise, and the torque ripple of the synchronous motor is closely related to the vibration noise of the motor. As can be seen from Figure 5, the optimal area of torque ripple (%) is Between 0.35~0.55. In order to make the motor have maximum output power and minimum vibration noise, 0.35~0.55 is the best value, and the relationship of 0.35≦Rd1/Rd2≦0.55 is satisfied.

Referring to FIGS. 6 and 7, the simulated waveforms of torque for the sum of the distance 24 of all the magnetic flux channels 52 between two adjacent flux barrier grooves 51 and the sum of the thickness 23 of the intermediate portions of all the flux barrier grooves 51. It can be seen from Figure 6 that the maximum torque range is between 0.8 and 1.3, and from Figure 7 that the optimal region of torque ripple is between 0.7 and 1.15, considering the maximum output power of the motor and the minimum vibration noise, so , 0.8~1.15 is the best value, and meet the relationship of 0.8≦I/F≦1.15.

The use of different numbers of rotor units of the barrier unit 5 has a great influence on the output torque and output power of the motor. In this preferred embodiment, four barrier units 5 are used, which can be used at high speeds above 1800 RPM to obtain higher output Power and efficiency, in particular, the above description of the speed at 1800 RPM is for illustration only and should not limit the scope of the present invention.

In summary, the rotor device and the reluctance motor having the rotor device of the present invention, through which the body unit 3 and the plurality of barrier units 5 are mutually arranged, pass through the magnetic flux barrier groove closest to the center of the rotor core 31 The middle thickness 23 of 51 is greater than the thickness of both ends, and is closest to the rotor iron The intermediate thickness 23 of the magnetic flux barrier groove 51 of the center of the core 31 is greater than the intermediate thickness 23 of the magnetic flux barrier groove 51 that is farthest from the center of the rotor core 31 to reduce the motor torque ripple and thereby suppress the vibration noise. Furthermore, shortening the width of the ends of both sides of the magnetic flux barrier groove 51 and the outer edge of the rotor core 31 can thereby obtain the maximum motor characteristics without increasing the optimal design of the motor torque ripple, The efficiency of the motor reaches the highest level, thereby achieving the purpose of cost saving and mass production, so it can indeed achieve the purpose of cost invention.

However, the above are only the preferred embodiments of the present invention, which should not be used to limit the scope of the implementation of the present invention, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the description of the invention, All of them are still covered by the patent of the present invention.

21‧‧‧Diameter

22‧‧‧Diameter

3‧‧‧Body unit

31‧‧‧Rotor core

32‧‧‧spindle

51‧‧‧flux barrier groove

52‧‧‧flux channel

Claims (10)

A rotor device includes: a body unit, including a rotor core, and a main shaft passing through the rotor core; and four barrier units that are evenly spaced and spaced on the rotor core, each barrier The unit includes at least two magnetic flux barrier grooves spaced apart and penetrating the rotor core, and at least one magnetic flux channel between two adjacent magnetic flux barrier grooves, wherein the magnetic flux barrier groove closest to the center of the rotor core The middle thickness is greater than the thickness at both ends. According to the rotor device described in item 1 of the patent application scope, wherein the barrier unit defines a d-axis between two adjacent barrier units and a q-axis passing through the center of the magnetic flux barrier slot, the rotor The diameter of the center of the iron core along the outermost circumference and the q axis of the four magnetic flux barrier grooves closest to the center is Rd1. The diameter of the rotor core is Rd2. Rd1 and Rd2 satisfy 0.35≦Rd1 /Rd2≦0.55 relationship. According to the rotor device described in item 2 of the patent application scope, wherein the number of the magnetic flux barrier grooves is 2 to 5, when the number of the magnetic flux barrier grooves is 2, the middle part of the two magnetic flux barrier grooves is defined The sum of the thickness is F', the distance of the magnetic flux channel between two adjacent flux barrier grooves is I', and I'and F'satisfy the relationship of 0.8≦I′/F′≦1.15; when the number of the flux barrier grooves 3~5, define the sum of the thickness of the middle part of all flux barrier grooves as F, The sum of the distances of all magnetic flux channels between two adjacent magnetic flux barrier grooves is I, and I and F satisfy the relationship of 0.8≦I/F≦1.15. The rotor device according to item 3 of the patent application scope, wherein the intermediate thickness of the magnetic flux barrier groove closest to the center of the rotor core is greater than the intermediate thickness of the magnetic flux barrier groove farthest from the center of the rotor core, and Each magnetic flux channel between the two magnetic flux barrier grooves has the same pitch. According to the rotor device described in item 4 of the patent application scope, the shape of the ends of each side of each flux barrier groove is generally arc-shaped, and each barrier unit further includes a plurality of flux barrier grooves connected to The connecting ribs on the q-axis are used to increase the structural strength of the rotor core. According to the rotor device described in item 5 of the patent application scope, when the diameter of the rotor core is greater than 60 mm, the width of the two ends of the flux barrier groove and the outer edge of the rotor core is not less than 0.3 mm. According to the rotor device described in item 6 of the patent application scope, when the diameter of the rotor core is greater than 100 mm, the width of the ends of both sides of the flux barrier groove and the outer edge of the rotor core is not less than 0.4 mm. According to the rotor device described in item 7 of the scope of the patent application, when the diameter of the rotor core is greater than 130 mm, the width of the two ends of the magnetic flux barrier groove and the outer edge of the rotor core is not less than 0.5 mm. According to the rotor device described in item 8 of the scope of the patent application, when the diameter of the rotor core is greater than 160 mm, the width of the two ends of the magnetic flux barrier groove and the outer edge of the rotor core is not less than 0.6 mm. A reluctance motor includes a stator device having a stator core and distributed windings wound on the stator core, and a patent scope according to the application The rotor device described in any one of items 1 to 9 and installed inside the stator device.

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