KR101231101B1 - Separated motor - Google Patents

Abstract

PURPOSE: A separable motor is provided to prevent a rotor shaft from being bent due to a rotation force by supporting the middle part of the rotor shaft through a bearing in a partition. CONSTITUTION: A housing(100) forms an outer appearance of a separable motor and is divided into a first part, a second part(120), and a third part(130) by a partition(150). A rotor(300) is serially connected to a rotor shaft(400). The rotor includes a first rotor(310a), a second rotor(320a), and a third rotor(330a). A stator(200) is arranged in the housing to face the rotor. The stator includes a first stator(210a), a second stator(220a), and a third stator(230a).

Description

Separate motor

The present invention relates to a motor, and more particularly to a separate motor.

In general, vehicles such as automobiles are driven using gasoline engines, diesel engines or motors. Among them, a motor-driven vehicle is a driving system of a vehicle that uses electricity as a power source, and uses a method in which power of a motor mounted inside a wheel is directly transmitted to a wheel, and additionally, an engine in a gasoline or diesel vehicle -The hybrid drive method is used in which the wheel is driven to rotate by transmission of power through the mission-drive shaft.

Conventional automotive drive systems rely on a single motor, which results in the performance of each motor being vehicle performance. For this reason, the control performance and efficiency of each motor represent the performance and efficiency values of the vehicle.

The motor driving the motor is operated while the rotor and the stator constituting the motor are always at regular intervals. In particular, the motor is composed of a narrow gap between the rotor and the stator to increase torque efficiency.

However, such a conventional motor has a problem in that torque ripple occurs due to the control of electromotive force, distribution characteristics of back electromotive force, and inductance during driving, thereby increasing noise and vibration.

The present invention has been made to solve various problems including the above problems, and an object thereof is to provide a separate motor that realizes low noise and low vibration. However, these problems are exemplary and do not limit the scope of the present invention.

According to one aspect of the invention, the rotor shaft is penetrated, disposed in the housing separated into at least two parts, and in the separated part so as to be connected in series with the rotor shaft, the polarities thereof are sequentially staggered at a predetermined angle. A separate motor is provided that includes misplaced rotors and stators disposed in the separated part so as to face the rotors, and sequentially controlled to have a predetermined phase difference between their polarities.

The predetermined angle and the predetermined phase difference,

-

부터

-

from

+

까지 일 수 있다.

+

Can be up to

The housing is divided into a first part, a second part, and a third part sequentially in the rotor axial direction, and the rotors include a first rotor in the first part, a second rotor in the second part, and the third part. And a third rotor in the stator, wherein the stators may include a first stator in the first part, a second stator in the second part, and a third stator in the third part.

The polarity of the second rotor is staggered at the predetermined angle in one direction from the polarity of the first rotor, and the polarity of the third rotor is staggered at the predetermined angle in the one direction from the polarity of the second rotor. Can lose.

The predetermined angle may be 7.5 ° to 22.5 ° in each direction.

The first stator, the second stator, and the third stator may have the same polarity.

The first stator, the second stator, and the third stator may be sequentially controlled such that the phase difference is 7.5 ° to 22.5 °, respectively.

The rotors may each include permanent magnets having at least two polarities, and the stators may each include at least two slots wound.

The rotors may each have the same number of polarities, and the stators may each have the same number of polarities.

Installed in the housing, may further include a bearing for supporting the rotor shaft.

The housing may further include at least one partition wall separating the at least two parts.

The rotor shaft may further include a bearing installed on the at least one partition wall.

It may further include a control unit for sequentially applying a current so that the polarity of the stator phase difference.

On the other hand, according to another aspect of the invention, the housing is divided into at least three parts, the rotor is arranged in series on the at least three parts, respectively, the polarities are arranged in a staggered angle at a predetermined angle, and A separate motor is provided, each of which is disposed in a separate part, and includes a stator having polarity and a controller for sequentially applying current so that the polarities of the stators are out of phase.

According to one embodiment of the present invention made as described above, it is possible to implement a separate motor for realizing low noise and low vibration. Of course, the scope of the present invention is not limited by these effects.

1 is a side cross-sectional view schematically showing a separate motor according to an embodiment of the present invention.
FIG. 2 is a front sectional view schematically showing the separate motor of FIG. 1. FIG.
3 is a graph showing current waveforms of stators of the separate motor of FIG. 1.
4 is a side cross-sectional view schematically showing a separate motor according to another embodiment of the present invention.
FIG. 5 is a front sectional view schematically showing the separate motor of FIG. 4. FIG.
FIG. 6 is a graph showing current waveforms of stators of the separate motor of FIG. 4.
7 is a graph illustrating torque ripple of the separate motor of FIG. 4.
8 is a front sectional view schematically showing a separate motor according to another embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Also, for convenience of explanation, the components may be exaggerated or reduced in size.

1 is a side cross-sectional view schematically showing a detachable motor according to an embodiment of the present invention, and FIG. 2 is a schematic front cross-sectional view showing respective stators 200 and rotors 300 of the detachable motor of FIG. 1. to be. 3 is a graph showing current waveforms of the stators 200 of the separate motor of FIG. 1.

Referring to FIG. 1, the detachable motor may include a housing 100, stators 200, rotors 300, and a rotor shaft 400.

The housing 100 may form an appearance of a separate motor. For example, the housing 100 may have a cylindrical shape, and stators 200, rotors 300, and rotor shafts 400 may be disposed therein. Here, the rotor shaft 400 may pass through the housing 100. In addition, the housing 100 may be a bearing 510 is installed. The bearing 510 supports the rotor shaft 400 to minimize the frictional force generated when the rotor shaft 400 rotates.

The housing 100 may be separated into at least two parts. For example, the housing 100 may be separated from the stator and the rotor by being divided into the housing 100. Alternatively, the space in the housing 100 may be separated by at least one partition wall 150 and separated into at least two parts. For example, as shown in FIG. 1, the housing 100 may be separated into two parts by one partition wall 150. The partition wall 150 may be installed perpendicularly to the rotor shaft 400. In the following description, at least two parts are divided into a first part 110 and a second part 120.

Meanwhile, a bearing 520 may be installed on the partition wall 150 to support the rotor shaft 400. The bearing 520 installed on the partition wall 150 supports the middle portion of the rotor shaft 400, thereby preventing the rotor shaft 400 from being bent by the rotational force, and the stators 200 and the rotors 300. The interval of can be kept constant.

The rotors 300 may be coupled to the rotor shaft 400 in series and disposed on separate parts, respectively. These rotors 300 may be staggered at predetermined angles 315 in order of their polarities. For example, the rotors 300 may include a first rotor 310 disposed in the first part 110 and a second rotor 320 disposed in the second part 120. Since the first rotor 310 and the second rotor 320 are disposed in the first part 110 and the second part 120, respectively, the first rotor 310 and the second rotor 320 may be sequentially arranged in series in the direction of the rotor axis 400. Hereinafter, the rotors 300 will be divided into a first rotor 310 and a second rotor 320, and a predetermined angle 315 will be described later.

In addition, the first rotor 310 and the second rotor 320 may have polarity. For example, the first rotor 310 and the second rotor 320 may include permanent magnets having at least two polarities. In addition, the first rotor 310 and the second rotor 320 may have the same number of polarities. For example, in the case of a 2-pole 6-slot embedded permanent magnet synchronous motor (IPMSM), the first rotor 310 and the second rotor 320 each have a permanent magnet having one NS pole. It may include. As another example, in the case of an 8-pole 6-slot embedded permanent magnet motor, the first rotor 310 and the second rotor 320 may each include permanent magnets having four NS poles.

On the other hand, the first rotor 310 and the second rotor 320 may be disposed in the first part 110 and the second part 120 so that the polarity is staggered at a predetermined angle (315). For example, referring to FIG. 2, in the case of a two-pole six-slot embedded permanent magnet motor, the NS pole of the first rotor 310 and the NS pole of the second rotor 320 are staggered from each other at a predetermined angle 315. Can be achieved. In this way, a predetermined angle 315 may be achieved to offset the torque ripple.

부터This predetermined angle 315 is

from

까지 일 수 있다.

Can be up to

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For example, in the case of a two-pole six-slot motor, the number of polarities of the first stator 210 may be six, and the number of polarities of the first rotor 310 may be two. The number of separated parts may be two. Therefore, when the large value 6 and the number 2 of the motors are substituted, it can be seen that a predetermined angle 315 in which the same polarities of the first rotor 310 and the second rotor 320 cross each other is 15 ° to 45 °. .

Here, the predetermined angle 315 in which the polarities of the first rotor 310 and the second rotor 320 are staggered may be formed in one direction. For example, N of the second rotor 320 may be inclined in either a clockwise or counterclockwise direction with respect to the rotor shaft 400.

The stators 200 may be disposed inside the housing 100 and separated parts in more detail so as to face the rotors 300. For example, the stators 200 may include a first stator 210 facing the first rotor 310 and a second stator 220 facing the second rotor 320. As another example, the stators 200 may be rotatably positioned inside the rotors 300 to be rotatable.

The first stator 210 may be disposed in the first part 110, and the second stator 220 may be disposed in the second part 120. Since the first stator 210 and the second stator 220 are disposed in the first part 110 and the second part 120, respectively, the first stator 210 and the second stator 220 may be sequentially arranged in series in the direction of the rotor axis 400.

Hereinafter, the stator 200 is divided into a first stator 210 and a second stator 220.

The first stator 210 and the second stator 220 may have polarity. In addition, the first stator 210 and the second stator 220 may have the same number of polarities. For example, the first stator 210 and the second stator 220 may include at least two wound slots. As another example, the first stator 210 and the second stator 220 may have polarities of three phases (six slots), respectively.

The first stator 210 and the second stator 220 may have the same polarity. For example, referring to FIG. 2, if the polarity is arranged in the direction from the first stator 210 to the ground, the polarity of the second stator 220 may be arranged in the direction of the ground. Of course, the same applies to the case where the polarity is arranged in the direction from the first stator 210 to the ground.

Meanwhile, polarities of the first stator 210 and the second stator 220 may be sequentially controlled to have a predetermined phase difference. A description with reference to FIG. 3 is as follows.

3 is a graph showing the current waveform of the separate motor of FIG. For example, when AC power is applied to a motor of a two-pole six-slot (three phase), three current waveforms appear in one stator, but one current waveform is shown for ease of explanation, respectively.

Referring to FIG. 3, currents may be sequentially applied to polarities of the first stator 210 and the second stator 220 so that a predetermined phase difference occurs. For example, the first stator 210 may receive current, and the second stator 220 may receive current. As another example, the second stator 220 may receive a current, and the first stator 210 may receive a current. The order of application may vary depending on one direction in which the polarities of the rotors 300 are arranged. Therefore, the current waveforms of the polarity of the first stator 210 and the second stator 220 are the same, but there is a predetermined phase difference with time, thereby canceling the torque ripple.

Meanwhile, a predetermined phase difference will be described with reference to FIG. 2. The phase difference between the polarity of the first stator 210 and the second stator 220 is

부터

from

가 되도록, 순차적으로 전류를 인가받을 수 있다.

In order to be, the current may be sequentially applied.

For example, in the case of a two-pole six-slot motor, the number of polarities of the first stator 210 may be six, and the number of polarities of the first rotor 310 may be two. The number of separated parts may be two. Therefore, if a large value of 6 and the number of motors 2 are substituted, the polarities of the first stator 210 and the second stator 220 may have a phase difference of 15 ° to 45 °.

In this way, the polarities of the first rotor 310 and the second rotor 320 are arranged to form a predetermined angle 315, and the current is applied so that the polarities of the first stator 210 and the second stator 220 are out of phase. Upon application, the torque ripple of the first part 110 and the torque ripple of the second part 120 may be canceled in the rotor shaft 400.

4 is a schematic side cross-sectional view of a separate motor according to another embodiment of the present invention, and FIG. 5 is a schematic front cross-sectional view showing each stator and rotor of the separate motor of FIG. 4. 6 is a graph showing current waveforms of the stators 200 of the separate motor of FIG. 4, and FIG. 7 is a graph showing torque ripple of the separate motor of FIG. 4.

The motor according to this embodiment further separates the housing 100 from the detachable motor of FIG. 1 described above, and thus, redundant description of the two embodiments will be omitted.

Referring to FIG. 4, the detachable motor may include a housing 100, stators 200, rotors 300, and a rotor shaft 400.

The housing 100 may be separated into the first part 110, the second part 120, and the third part 130 in the direction of the rotor shaft 400. For example, a partition wall may be installed in the housing 100 to partition and separate the inside of the housing 100.

The stators 200 and the rotors 300 may be disposed in the parts 110, 120, and 130, respectively. For example, the first part 110 has a first stator 210a and a first rotor 310a, and the second part 120 has a second stator 220a and a second rotor 320a, and a third part. The third stator 230a and the third rotor 330a may be disposed in the part 130, respectively.

The rotors 300 may include a first rotor 310a, a second rotor 320a, and a third rotor 330a. Referring to FIG. 4, the first rotor 310a, the second rotor 320a, and the third rotor 330a are sequentially arranged in the direction of the rotor axis 400, and the polarities of the first rotor 310a, the third rotor 330a are alternately twisted, and the predetermined angle ( 315 and 325 may be achieved respectively. Here, the first rotor 310a, the second rotor 320a and the third rotor 330a may include permanent magnets having at least two polarities. In addition, the first rotor 310a, the second rotor 320a, and the third rotor 330a may each include the same number of polarities. Meanwhile, the predetermined angles 315 and 325 will be described later.

For example, in the case of a two-pole six-slot embedded permanent magnet motor, the first rotor 310a, the second rotor 320a, and the third rotor 330a may each include a permanent magnet having one NS pole. Can be. As another example, in the case of an 8-pole 6-slot motor, the first rotor 310a, the second rotor 320a, and the third rotor 330a may each include permanent magnets having four NS poles.

On the other hand, the first rotor (310a), the second rotor (320a) and the third rotor (330a) the first part 110, the second part 120 so that the polarity is staggered at a predetermined angle (315, 325) And third parts 130, respectively. For example, referring to Figure 5, in the case of a motor of a two-pole six-slot, the first rotor 310a NS pole. The NS pole of the second rotor 320a and the NS pole of the third rotor 330a may cross each other to form a predetermined angle.

Here, the predetermined angles 315 and 325 can be known in the range using the above-described equation. For example, in the case of a 2-pole 6-slot motor, since the number of separated parts is 3 and the number of slots of the stator is 6, the predetermined angles 315 and 325 may be 7.5 ° to 22.5 °. Therefore, the polarity of the first rotor 310a and the polarity of the second rotor 320a, the polarity of the second rotor 320a and the polarity of the third rotor 330a may be staggered to achieve 7.5 ° to 22.5 °, respectively. .

On the other hand, the polarity of the second rotor 320a is staggered at a predetermined angle 315 in one direction from the polarity of the rotor of the first rotor 310a, and the polarity of the third rotor 330a is the second rotor 320a. It can be staggered at a predetermined angle 325 in the one direction from the polarity of. For example, referring to FIG. 5, the polarities of the first rotor 310a, the second rotor 320a, and the third rotor 330a are 7.5 ° to ˜counterclockwise with respect to the rotor shaft 400. May be arranged to achieve 22.5 °.

The stators 200 may include a first stator 210a, a second stator 220a, and a third stator 230a. The first stator 210a, the second stator 220a, and the third stator 230a may have polarities, and the number of the above polarities may be the same. For example, the first stator 210a, the second stator 220a, and the third stator 230a may include at least two wound slots. As another example, the first stator 210a, the second stator 220a, and the third stator 230a may each have a polarity of three phases (six slots).

Referring to FIG. 4, the first stator 210a, the second stator 220a, and the third stator 230a may be sequentially arranged in the rotor axis 400 direction. In addition, the polarities of the first stator 210a, the second stator 220a, and the third stator 230a may be sequentially controlled to be out of phase with each other. This control is described in detail later.

Meanwhile, referring to FIG. 4, the first stator 210a, the second stator 220a, and the third stator 230a may be disposed at the same polarity. For example, if the polarity is arranged in the direction entering the ground in the first stator 210a, the second stator 220a and the third stator 230a may be arranged in the same direction entering the ground. Of course, the same applies to the case where the polarity is arranged in the direction coming out of the ground in the first stator 210a.

6 is a graph illustrating a current waveform of the separate motor of FIG. 1. For example, when AC power is applied to a motor of two-pole six slots (three phases), three current waveforms appear in one stator, but one current waveform is shown for ease of explanation, respectively.

Referring to FIG. 6, the polarities of the first stator 210a, the second stator 220a, and the third stator 230a may be sequentially applied with current so that a predetermined phase difference occurs. For example, the first stator 210a, the second stator 220a, and the third stator 230a may receive current. Alternatively, the current may be applied in the order of the third stator 230a, the second stator 220a, and the first stator 210a. The order of application may vary depending on one direction in which the polarities of the rotors 300 are arranged.

As described above, the polarities of the first stator 210a, the second stator 220a, and the third stator 230a have the same current waveform, and there is a predetermined phase difference with time, thereby canceling the torque ripple.

Meanwhile, referring to FIG. 4, a predetermined phase difference can be described by calculating the phase difference between the polarities of the first stator 210a and the second stator 220a by the above-described equation. For example, in the case of a two-pole six-slot motor, the number of polarities of the first stator 210a is 6, the number of polarities of the first rotor 310a is 2, and the number of separated parts is 3, so that the predetermined phase difference is It may be 7.5 ° ~ 22.5 °. Therefore, if current is sequentially applied from the first stator 210a, the phase difference between the polarities of the first stator 210a and the second stator 220a becomes 7.5 ° to 22.5 °, and the second stator 220a and the third The phase difference of the polarity of the stator 230a will be 7.5 ° ~ 22.5 °.

Referring to FIG. 7, torque ripples of the first part 110, the second part 120, and the third part 130 are illustrated. The polarities of the first rotor 310a, the second rotor 320a, and the third rotor 330a are arranged to have a predetermined angle, and the first stator 210a, the second stator 220a, and the third stator 230a are disposed. ), The torque ripple of the first part 110, the torque ripple of the second part 120, and the torque ripple of the third part 130 are canceled in the rotor shaft 400. Can be.

8 shows another embodiment of the present invention. The motor according to this embodiment is a control unit 500 is added to the separate motor of FIG. 4 described above, and thus duplicated description is omitted in both embodiments.

The controller may sequentially apply current such that the polarities of the first stator 210a, the second stator 220a, and the third stator 230a are in phase difference. Herein, the controller 500 may determine the number corresponding to the number of stators 200. For example, if the stator 200 is three, the control unit 500 may also be configured as three. However, in this embodiment, since the control process is simplified by sequentially controlling the stators 200, one controller 500 may sequentially apply current to the stators 200.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100: housing 200:
300: rotor 400: rotor shaft
500: control unit 510, 520: bearing

Claims (14)

A housing through which the rotor shaft penetrates and separated into at least two parts;
Rotors each disposed in the separated part so as to be connected in series with the rotor shaft, and the polarities thereof are sequentially staggered at a predetermined angle; And
Stators disposed in the separated parts so as to face the rotors and sequentially controlled so as to have a predetermined phase difference between the polarities;
Including, removable motor. The method of claim 1,
The predetermined angle and the predetermined phase difference,

from

Detachable motor, which is up to. The method of claim 1,
The housing is divided into a first part, a second part and a third part sequentially in the rotor axial direction,
The rotors include a first rotor in the first part, a second rotor in the second part and a third rotor in the third part,
The stator includes a first stator in the first part, a second stator in the second part, and a third stator in the third part. The method of claim 3,
The polarity of the second rotor is staggered at the predetermined angle in one direction from the polarity of the first rotor, and the polarity of the third rotor is staggered at the predetermined angle in the one direction from the polarity of the second rotor. False, detachable motor. 5. The method of claim 4,
The predetermined angles are 7.5 ° to 22.5 ° each in either direction. The method of claim 3,
The first stator, the second stator and the third stator are disposed in the same polarity, the separate motor. The method of claim 3,
The first stator, the second stator and the third stator are sequentially controlled so that the phase difference is 7.5 ° ~ 22.5 ° respectively. The method of claim 1,
The rotors each include a permanent magnet having at least two polarities,
The stator includes at least two slots each wound. The method of claim 1,
The rotors each have the same number of polarities,
And said stators each have the same number of polarities. The method of claim 1,
And a bearing installed in the housing, the bearing supporting the rotor shaft. The method of claim 1,
The housing further comprises at least one partition wall separating the at least two parts. The method of claim 11,
And a bearing supporting the rotor shaft and installed in the at least one partition. The method of claim 1,
And a control unit for sequentially applying current to the stators such that the polarities of the stators are out of phase. A housing separated into at least three parts;
Rotors each disposed in series with the at least three parts, the polarities of which are sequentially staggered at a predetermined angle;
Stators disposed on the separated parts and having polarities; And
A controller for sequentially applying current so that the polarities of the stators are in phase difference;
Including, removable motor.

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