KR102195046B1 - Motor having Two Inputs and Outputs - Google Patents

Abstract

According to an embodiment of the present invention, provided is a dual input and output motor with high efficiency in both a low speed high torque range and a high speed low torque range. The dual input and output motor comprises: a first machine including a first stator and a first rotor rotating with respect to the first stator; a second machine disposed on one side of the first machine and including a second stator and a second rotor rotating with respect to the second stator and rotating at a higher speed than the first rotor; a first inverter applying a current to the first machine; and a second inverter applying the current to the second machine independently of the first inverter.

Description

Dual input/output motor {Motor having Two Inputs and Outputs}

The present invention relates to a dual input/output motor, and more specifically, to a dual input/output motor capable of dual mode driving through two independent inputs and two outputs.

There has been a continuing demand for motors that provide low speed high torque and high speed low torque.

To this end, as shown in Fig. 1(a), a method of using a single input/output terminal, a method of using a double input terminal, as shown in Fig. 1(b), as shown in Fig. 1(c), A method of driving two output stages with a single input stage was being developed.

However, these conventional methods are restricted to driving each other even if there are two output stages by the dependent electromagnetic region. That is, the conventional method has a limitation in that the efficiency at low speed and high speed is lowered because one dependent electromagnetic region is used. In addition, the conventional device has disadvantages such as efficiency lost in the process of crossing the low-speed high torque and high-speed low torque regions, and required additional inverter functions.

Accordingly, the present inventors have invented a dual input/output motor having high efficiency in both a low speed high torque region and a high speed low torque region.

Korean Patent Application Publication No. 10-2019-0069303 (2019.06.19)

One technical problem to be solved by the present invention is to provide a dual input/output motor having high efficiency in both a low speed high torque region and a high speed low torque region.

The technical problem to be solved by the present invention is not limited to the above.

The dual input/output motor according to an embodiment of the present invention includes: a first machine including a first stator and a first rotor rotating with respect to the first stator; A second machine disposed on one side of the first machine and including a second rotor and a second rotor rotating with respect to the second stator and rotating at a higher speed than the first rotor; A first inverter for applying current to the first machine; And a second inverter that applies current to the second machine independently from the first inverter.

According to an embodiment, a first shaft that rotates in conjunction with the first rotor and a first shaft that rotates in conjunction with the second rotor, but rotates independently of the first shaft, and is coaxial with the first shaft. It further includes two shafts, the second rotor, the second stator, the first stator, and the first rotor are sequentially disposed outward in the radial direction of the first and second shafts, and the second stator and A barrier shielding a magnetic field may be disposed between the first stators.

According to an embodiment, the radial distance of the barrier from the first and second axes may be determined by putting a weight on the efficiency of the first machine rather than the efficiency of the second machine.

According to an embodiment, a first winding and a first magnet may be disposed in the first machine so as to conform to relational expression (1).

Relation (1):-Za = Zm-Nr

(Za is the number of poles of the first winding, Zm is the number of poles of the first magnet, and Nr is the number of poles of the first rotor)

According to an embodiment, in the first stator, a first stator tooth on which a first winding is disposed is provided along a circumferential direction of the first stator, and a surface of the first stator tooth faces the first rotor. A first magnet is provided in the direction, the second stator is provided with a second stator tooth in which a second winding is disposed along a circumferential direction of the second stator, and the second rotor is on one surface of the second stator tooth. A second magnet is provided in a direction facing the first magnet, and the first magnet is made of magnets having the same magnetization direction toward the first rotor, and the second magnet is alternately magnetized toward the second rotor. It can be made of magnets having a direction.

The dual input/output motor according to an embodiment of the present invention includes: a first machine including a first stator and a first rotor rotating with respect to the first stator; A second machine disposed on one side of the first machine and including a second rotor and a second rotor rotating with respect to the second stator and rotating at a higher speed than the first rotor; A first inverter for applying current to the first machine; And a second inverter that applies current to the second machine independently from the first inverter.

Accordingly, since the first machine and the second machine have electromagnetic regions independent from each other, high efficiency can be provided.

Since the first machine according to an exemplary embodiment may be driven in a vernier mode, it may be possible to omit a reduction gear.

According to an embodiment, since the magnet is provided on one side of the stator teeth, the configuration of the rotor can be simplified and durability of the rotor can be improved.

The effects of the present invention are not limited to the above-described effects, and may be more clearly defined by the following description.

1 is a view for explaining a motor according to the prior art.
2 to 4 are diagrams for explaining a dual input/output motor according to an embodiment of the present invention.
5 is a diagram illustrating excellence in terms of efficiency of a dual input/output motor according to an embodiment of the present invention.
6 is a diagram for describing an effect of a barrier according to an embodiment of the present invention.
7 and 8 are diagrams for explaining a geometric design of a barrier according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical idea of the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed content may be thorough and complete, and the spirit of the present invention may be sufficiently conveyed to those skilled in the art.

In the present specification, when a component is referred to as being on another component, it means that it may be formed directly on the other component or that a third component may be interposed between them. In addition, in the drawings, the shape and size are exaggerated for effective description of technical content.

In addition, in various embodiments of the present specification, terms such as first, second, and third are used to describe various components, but these components should not be limited by these terms. These terms are only used to distinguish one component from another component. Accordingly, what is referred to as a first component in one embodiment may be referred to as a second component in another embodiment. Each embodiment described and illustrated herein also includes its complementary embodiment. In addition, in the present specification,'and/or' is used to mean including at least one of the elements listed before and after.

In the specification, expressions in the singular include plural expressions unless the context clearly indicates otherwise. In addition, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, elements, or a combination of the features described in the specification, and one or more other features, numbers, steps, and configurations It is not to be understood as excluding the possibility of the presence or addition of elements or combinations thereof. In addition, in the present specification, "connection" is used to include both indirectly connecting a plurality of constituent elements and direct connecting.

Further, in the following description of the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

2 to 4 are views for explaining a dual input/output motor according to an embodiment of the present invention.

2 to 4, the dual input/output motor 100 according to an embodiment of the present invention may include a first machine 110 and a second machine 150.

The first machine 110 may perform low-speed high-torque start-up, and the second machine 150 may perform high-speed low-torque start-up. If the double input/output motor 100 according to an embodiment is applied to a washing machine, the first machine 110 may be driven in the washing mode, and the second machine 150 may be driven in the spin-drying mode.

The first machine 110 may include a first stator 120 and a first rotor 130.

The first stator 120 may include first stator teeth arranged along the circumferential direction of the first stator 120 and first stator slots disposed between adjacent first stator teeth. That is, the first stator teeth and the first stator slot may be alternately disposed along the circumferential direction of the first stator 120.

A first winding (not shown) may be provided on the first stator tooth.

According to an example, a first magnet 122 may be provided on one surface of the first stator tooth, for example, in a direction facing the first rotor 130. For a more specific example, two magnets may be provided on one first stator tooth. In this case, the two magnets provided on one first stator tooth may be spaced apart a predetermined distance along the circumferential direction of the first stator 120. In addition, the first magnet 122 may have the same magnetization direction toward the first rotor 130.

For reference, in this specification, the term magnet may mean a permanent magnet.

The first rotor 130 may have a first rotor tooth 132 and a first rotor slot 134 along the circumferential direction of the first rotor 130. In this case, the first rotor teeth 132 and the first rotor slot 134 may be alternately positioned along the circumferential direction of the first rotor 130.

The first rotor 130 may rotate about a predetermined axis with respect to the first stator 120. The first rotor 130 may rotate by the first winding disposed on the first stator 120 and the first magnet 122. For example, the first rotor 130 may rotate by a reluctance torque.

In this case, the first rotor 130 may rotate in a vernier mode to generate a low-speed high torque. To this end, the first stator 120 and the first rotor 130 may conform to the following relational equation (1).

Relation (1): -Za = Zm-Nr

(Za is the number of poles of the first winding, Zm is the number of poles of the first magnet, and Nr is the number of poles of the first rotor)

According to an example, Za may be 24, Nr may be 26, and Za may be 2.

When the first machine 110 is started in the vernier mode, there is an advantage in that it not only can provide low-speed high torque, but also can omit the reduction gear.

The second machine 150 may include a second stator 160 and a second rotor 170.

The second stator 160 may also include second stator teeth arranged along the circumferential direction of the second stator 160 and second stator slots disposed between adjacent second stator teeth. The second stator teeth and the second stator slot may be alternately disposed along the circumferential direction of the second stator 160.

A second winding (not shown) may be provided on the second stator tooth.

According to an example, a second magnet 162 may be provided on one side of the second stator tooth, for example, in a direction facing the second rotor 170. For a more specific example, two magnets are provided on one second stator tooth, but their magnetization directions may be opposite to each other. In addition, the two magnets provided in one second stator tooth may be disposed so that side surfaces of the second stator 160 are in contact with each other along the circumferential direction.

The second rotor 170 may rotate about a predetermined axis with respect to the second stator 160. In this case, a rotation axis of the second rotor 170 and a rotation axis of the first rotor 130 may form co-axial with each other.

The second rotor 170 may rotate by the second winding disposed on the second stator 160 and the second magnet 162. For example, the second rotor 170 may rotate by reluctance torque.

In this case, the components of the second machine 150 may be arranged to correspond to a higher speed and lower torque start than the first machine 110. That is, the components of the second machine 150 may be arranged in a mode other than the vernier mode.

Referring to FIG. 3 showing a cross section of the dual input/output motor 100 shown in FIG. 2, the dual input/output motor 100 according to an embodiment comprises a first shaft 192 and a coaxial with the first shaft. The second rotor 170, the second stator 160, the barrier 180, the first stator 120, and the first rotor 130 are disposed in a radial direction around the second axis 190. I can. The first rotor 130 may be coupled to rotate the first shaft 192, and the second rotor 170 may be coupled to rotate the second shaft 190. That is, the second machine 150 for rotating the second shaft 190 at high speed and low torque around the rotation axis is disposed, and the first machine 110 for rotating the first shaft 192 at low speed and high torque is disposed. will be.

Since the first machine 110 for low-speed high-torque start-up is located radially outward about the axial center as compared to the second machine 150 for high-speed low-torque start-up, it may be advantageous to provide a greater torque.

The barrier 180 is sandwiched between the first machine 110 and the second machine 150, so that the magnetic field provided from the first machine 110 to the second machine 150 and the second The magnetic field provided from the machine 150 to the first machine 110 may be shielded. That is, the barrier 180 may separate the electromagnetic region between the first machine 110 and the second machine 150.

To this end, the barrier 180 may be formed of a non-magnetic material. In addition, as shown in FIG. 3, the barrier 180 may have a thickness thicker than the second rotor 170, the second stator 160, the first stator 120, and the first rotor 130. have. Accordingly, the barrier 180 may more independently separate the electromagnetic region between the first machine 110 and the second machine 150.

The dual input/output motor 100 according to an embodiment includes a first inverter 210 that applies a driving current to the first machine 110 and a second inverter 250 that applies a driving current to the second machine 150. ) Can be included. The first inverter 210 and the second inverter 250 may independently apply a driving current to the windings of each machine.

For reference, the first inverter 210 is connected to the first DC/DC converter 220, the second inverter 250 is connected to the second DC/DC converter 260, and the first DC The /DC converter 220 and the second DC/DC converter 260 may be connected in parallel to the power supply 270.

That is, according to an embodiment of the present invention, since the driving current can be independently applied to each of the low speed high torque mode of the first machine 110 and the high speed low torque mode of the second machine 150, one driving mode Because it can be designed to focus only on, it can provide high efficiency and high performance.

For a more detailed description, reference will be made to FIG. 5.

5 is a diagram illustrating excellence in terms of efficiency of a dual input/output motor according to an embodiment of the present invention.

5(a) shows a speed vs. torque graph according to the prior art, and FIG. 5(b) shows a speed vs. torque graph of the dual input/output motor 100 according to an embodiment of the present invention.

Referring to Fig. 5(a), the weak magnetic flux control is used to widen the speed range after driving to the possible speed in the positive output section. The conventional device has high efficiency only in a constant speed torque region due to the dependent electromagnetic region, and thus, driving other speed torque regions has low efficiency. The high-efficiency region mainly appears in the high torque region immediately after the weak magnetic flux control is used. The other areas have relatively low efficiency, and in particular, in the low-speed high-torque area, the efficiency is low due to low output due to low speed. Accordingly, it is designed to focus on one of the two efficiencies in application cases where the use of the low-speed high-torque region and the high-speed low-torque region are forced. Therefore, the performance of the conventional device is limited in the application cases where the use of the low-speed high-torque region and the high-speed low-torque region are forced.

On the other hand, referring to FIG. 5(b), the dual input/output motor 100 according to an exemplary embodiment can drive a low speed and high speed dual mode by using a dual input terminal and a dual output terminal. In this case, since each mode is driven independently, it is possible to solve a conventional issue in which the electromagnetic region is dependent. Accordingly, each device is designed to have the highest efficiency in the assigned speed torque range without the disadvantages of the required weak magnetic flux control function and the efficiency lost in the process of crossing the speed torque range. Accordingly, the dual input/output motor 100 according to an exemplary embodiment may provide high efficiency in both a low speed high torque region and a high speed low torque region. In other words, it is possible to provide high-efficiency performance in both the speed torque regions to be driven without being focused only on the speed torque region. In addition, the difference in speed torque in low speed and high speed modes can be significantly increased.

Meanwhile, the effect of the dual input/output motor 100 according to an embodiment of the present invention can also be confirmed in the table below.

Items Units Machine I Machine II Rated speed RPM 50 1400 Rated torque Nm 17 4.1

Referring to Table 1, a low-speed high torque region provided by the first machine 110 of the dual input/output motor 100 according to an embodiment may provide a speed of 50 RPM and a torque of 17 Nm, and the second machine 150 The high-speed low-torque range provided by) can provide a speed of 1400RPM significantly greater than 50RPM and a torque of 4.1Nm significantly less than 17Nm.

Parameters Values Machine type Conventional device An embodiment of the invention Driving mode Low speed high torque High speed low torque Low speed high torque High speed low torque Speed (RPM) 50 1400 50 1400 Input current (A) 4.9 2.0 4.15 1.5 Average torque (Nm) 17.0 4.1 17.0 4.1 Iron loss (W) 3 131 3.5 30.7 Dongson (W) 18.4 3.0 7.7 24.3 Output (W) 89.5 601.1 89.5 601.1 efficiency (%) 80.6 82.0 88.8 91.6

Referring to Table 2, it can be seen that when the prior art and the embodiment 100 of the present invention provide the same speed and torque to each other, the input current can be reduced and greater efficiency can be obtained.

The effects described with reference to Tables 1 and 2 are interpreted to be effects that appear in that the first and second machines 110 and 150 can utilize electromagnetic regions independent from each other.

In summary, in the embodiment of the present invention described above, the first machine 110 and the second machine 150 provide different driving modes, but the first machine 110 and the second machine 150 are independent. By having an electromagnetic field, high efficiency can be provided.

In addition, since the first machine 110 and the second machine 150 are electrically independent from each other, even if one fails, the other can still operate normally. For example, even if a problem occurs in the input terminal supplying the driving current to the first machine 110, the second machine 150 can be normally driven.

In addition, since the first machine 110 utilizes the vernier effect, it can have high torque and high efficiency characteristics compared to the input.

In addition, the first stator 120 and the second stator 160 are magnets 122 and 162 are disposed, and the first rotor 130 and the second rotor 170 have a stator magnet type in which magnets are omitted. By doing so, it is possible to simplify the configuration of the rotor that starts to rotate. Thereby, the rotor can have high reliability.

Hereinafter, a barrier according to an embodiment of the present invention will be described in more detail with reference to FIGS. 6 to 8.

6 is a diagram for describing an effect of a barrier according to an embodiment of the present invention.

FIG. 6(a) is a motor that is the same as an embodiment, but the barrier 180 is omitted, and FIG. 6(b) shows a magnetic coupling of the dual input/output motor 100 according to an embodiment. .

In the case of FIG. 6(a), it was confirmed that magnetic coupling occurred in the portion marked in red. This leads to distortion of the back emf and unintended torque where it is not intended. In contrast, in the case of FIG. 6B, it can be seen that magnetic coupling between the first machine 110 and the second machine 150 is suppressed.

The barrier 180 according to an embodiment may be designed in consideration of both the efficiency of the first machine 110 and the efficiency of the second machine 150.

The efficiency of the dual input/output motor 100 according to an embodiment may be defined by Equation 1 below.

[Equation 1]

는 각각 효율, 출력 토크, 회전 속도(rad/s), 동손(copper loss), 철손(iron loss)를 의미)(

Means efficiency, output torque, rotational speed (rad/s), copper loss, iron loss, respectively)

At this time, the efficiency of the first machine 110 and the second machine 150 is affected by the radial distance at which the barrier 180 is located from the center of the axis.

Referring to FIG. 7(a), the efficiency of the first machine 110 increases as the radial distance of the barrier 180 increases, whereas referring to FIG. 7(b), the efficiency of the second machine 150 Silver decreases as the radius distance of the barrier 180 increases. That is, the efficiencies of the first machine 110 and the second machine 150 are in a trade-off relationship with each other.

Accordingly, in designing the radial distance of the barrier 180, where to use the dual input/output motor 100 according to an embodiment may be considered. For example, when the dual input/output motor 100 according to an embodiment is applied to a washing machine, the time in the washing mode is typically longer than the time in the spin-drying mode. Accordingly, the radius of the barrier 180 may be determined by putting a weight on the efficiency of the first machine 110 rather than the efficiency of the second machine 150. More specifically, the radial distance of the barrier 180 may be determined by putting a weight as shown in Equation 2 below.

[Equation 2]

는 각각 평균 효율, 제1 머신(110) 효율, 제2 머신(150) 효율)(

Is the average efficiency, the first machine 110 efficiency, the second machine 150 efficiency)

Accordingly, when considering Equation 2 above, the radial distance from the axial center of the barrier 180 may be determined to be 83.5 mm, as illustrated in FIG. 8.

Depending on the specific design of the first machine 110 and the second machine 150, the radial distance of the barrier 180 may vary, but it goes without saying that the above-described first and second equations may still be considered.

In the above, the present invention has been described in detail using preferred embodiments, but the scope of the present invention is not limited to specific embodiments, and should be interpreted by the appended claims. In addition, those who have acquired ordinary knowledge in this technical field should understand that many modifications and variations can be made without departing from the scope of the present invention.

100: dual input/output motor
110: first machine
120: first stator
130: first rotor
150: second machine
160: second stator
170: second rotor
180: barrier

Claims (5)

A first machine comprising a first stator and a first rotor rotating about the first stator;
A second machine disposed on one side of the first machine and including a second rotor rotating with respect to the second stator and the second stator, and rotating at a higher speed than the first rotor;
A first inverter for applying current to the first machine; And
Including a second inverter for applying a current to the second machine independently from the first inverter,
The first stator is provided with a first stator tooth in which a first winding is disposed along a circumferential direction of the first stator,
A first magnet is provided on one side of the first stator tooth in a direction facing the first rotor,
The second stator is provided with a second stator tooth in which a second winding is disposed along a circumferential direction of the second stator,
A second magnet is provided on one side of the second stator tooth in a direction facing the second rotor,
The first magnet is made of magnets having the same magnetization direction toward the first rotor,
The second magnet is made of magnets having an alternating magnetization direction toward the second rotor, a dual input/output motor. The method of claim 1,
A first shaft that rotates in conjunction with the first rotor and a second shaft that rotates in connection with the second rotor, and rotates independently of the first shaft, further comprising a second shaft coaxial with the first shaft,
Outward in the radial direction of the first and second axes, the second rotor, the second stator, the first stator and the first rotor are sequentially arranged,
A double input/output motor, wherein a barrier for shielding a magnetic field is disposed between the second stator and the first stator. The method of claim 2,
The dual input/output motor, wherein the radial distance of the barrier from the first and second axes is determined by giving the efficiency of the first machine more weight than the efficiency of the second machine. The method of claim 1,
The first winding and the first magnet are arranged to conform to the relational equation (1).
Relation (1):-Za = Zm-Nr
(Za is the number of poles of the first winding, Zm is the number of poles of the first magnet, and Nr is the number of poles of the first rotor) delete

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