KR102734760B1 - Rotor for motor - Google Patents

Abstract

The present invention relates to a motor rotor capable of blocking electrical gaps, leakage, and fringing flux to increase output performance and output density, and comprises: a rotor body rotatably received in an inner space of a stator of a motor, having a through hole formed in the center, and a plurality of magnet installation portions formed radially around the through hole; a rotating shaft coupled to the rotating body by penetrating the through hole; a plurality of magnets installed in the rotating body by penetrating the magnet installation portions and generating rotational force in the rotating body through interaction with the stator; and a pair of end rings penetrating one end and the other end of the rotating shaft and respectively arranged on one side and the other side of the rotating body; and a pair of end plates penetrating one end and the other end of the rotating shaft and respectively arranged on outer surfaces of the pair of end rings.

Description

ROTOR FOR MOTOR

The present invention relates to a rotor for a motor, and more particularly, to a rotor for a motor capable of increasing output performance and output density by blocking electrical gaps, leakage, and fringing magnetic flux.

A general motor includes a stator (STATOR) with coils wound around it that generate magnetism by electricity, and a rotor (ROTOR) that rotates by mutual electromagnetic force with the stator, and the rotor is equipped with a permanent magnet.

These motors are classified into surface mounted permanent magnet (SPM) motors and interior permanent magnet (IPM) motors depending on the structure of the rotor, that is, the location of the permanent magnets in the rotor.

That is, in a surface-mounted permanent magnet motor, the permanent magnets are placed on the surface of the rotor, and in a recessed permanent magnet motor, the permanent magnets are placed inside the rotor.

At this time, the embedded permanent magnet motor is capable of high torque and high efficiency due to its features such as easy fixation of permanent magnets during high-speed rotation compared to surface-mounted permanent magnets, combined use of magnetic torque and reluctance torque, and reduced eddy current loss on the rotor surface.

These embedded permanent magnet motors are composed of a cylindrical stator having a plurality of slots formed along the circumference for embedding bar-shaped conductors, and a rotor rotatably installed on the inner surface of the stator.

And, the rotor has a through hole formed in the center through which the rotation axis passes, and a plurality of barriers are formed at regular intervals between the through holes and the slots, and a permanent magnet is embedded in each of the barriers.

Meanwhile, when current is applied to the coil, the rotor rotates due to the interaction between the rotating magnetic field generated by the structure of the stator and the induced current generated in the conductor, and when the rotor reaches synchronous speed, torque due to the permanent magnet and reluctance torque due to the structure of the rotor are generated, causing the rotor to rotate and generate torque.

At this time, when the rotor rotates at high speed, the permanent magnet embedded in the barrier is shaken by centrifugal force, and to prevent the permanent magnet from being separated from the barrier or the laminated core from being lifted, rotor plates are mounted on the front and rear ends, which are the axial ends of the rotor.

These rotor plates are usually made of non-magnetic material.

The rotor plate made of a non-magnetic material is electromagnetically like a gap, which causes axial leakage and fringing flux at the ends of the motor, resulting in a somewhat reduced output performance.

In particular, the effects of leakage and fringing increase depending on the length of the gap and the axial length of the motor, resulting in a problem of reduced power density.

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Publication number 10-2005-0102251 (2005.10.26.)

The present invention has been proposed in consideration of the above circumstances, and its purpose is to provide a rotor for a motor capable of increasing output performance and output density by blocking electrical gaps, leakage, and fringing flux.

A rotor for a motor according to a first embodiment of the present invention comprises: a rotating body rotatably received in an inner space of a stator of a motor, a through hole formed in the center, and a plurality of magnet installation portions formed radially around the through hole; a rotating shaft coupled to the rotating body by penetrating the through hole; a plurality of magnets installed in the rotating body by penetrating the magnet installation portions and generating a rotational force in the rotating body through interaction with the stator; and a pair of end rings respectively penetrating one end and the other end of the rotating shaft and arranged on one side and the other side of the rotating body; and a pair of end plates respectively penetrating one end and the other end of the rotating shaft and arranged on outer surfaces of the pair of end rings.

The above end ring is made of a magnetic material.

The cross-section of the above magnet is formed in a shape corresponding to the magnet installation portion.

The above-described rotating shaft includes a shaft body portion that is longer than the rotating main body; and a support portion that extends radially along the outer circumference of the shaft body portion in one direction of the shaft body portion and supports the outer surface of the end plate.

The thicknesses of the above pair of end rings are mutually identical.

The inner diameter of the above end ring is the same as the inner diameter of the above through hole, and the outer diameter is the same as the outer diameter of the above rotating body.

The above end ring is formed in a number equal to the number of poles of the magnet.

The above end ring is magnetized in the axial direction.

The above end plate is made of a non-magnetic material.

According to the second embodiment of the present invention, the inner diameter of the end ring is larger than the inner diameter of the through hole, and the outer diameter is smaller than the outer diameter of the rotating main body.

A pair of the above end plates are formed with a shape corresponding to the end rings on the surfaces facing each other, and each has an end ring mounting groove formed therein, into which a pair of the above end rings are respectively mounted.

The depth of the above end ring mounting groove is the same as the thickness of the above end ring.

The end ring according to the third embodiment of the present invention is formed in a fan shape and is spaced apart from each other at a distance along the circumferential direction centered on the rotation axis.

The end ring according to the fourth embodiment of the present invention is formed in a rectangular shape and is spaced apart from each other in a circumferential direction with the rotation axis as the center.

As described above, the rotor for a motor according to the present invention has an outer diameter of a support portion that is larger than the outer diameter of a shaft body portion and smaller than the outer diameter of an end plate, so that an inner surface of the support portion is in contact with an outer surface of the end plate, thereby effectively preventing a rotating body, an end ring, and an end plate coupled to a shaft body portion from being detached outward, and enabling the rotating body, the end ring, and the end plate to be easily coupled to each other.

In addition, since the end ring is made of a magnetic material, the end ring can improve output by increasing the maximum magnetic flux in the effective gap, and can further improve output by preventing output performance from deteriorating due to axial leakage and fringing magnetic flux in the rotating body.

Accordingly, since the end ring made of a magnetic material increases the output performance compared to when using a conventional end ring made of a non-magnetic material, the number of laminated electrical steel plates forming the rotor body can be reduced, while maintaining the same output performance as when using a non-magnetic end ring, thereby reducing the weight of the motor rotor.

In addition, since the end ring made of a magnetic body is axially magnetized, the end ring has the effect of preventing the electrical steel plate of the laminated rotor body from being lifted and preventing the magnet from being detached from the magnet installation part to the outside.

In addition, since the end plate is made of a non-magnetic material, it has the effect of preventing the magnetic flux generated from the magnet from leaking.

In addition, since the end ring is mounted in the end ring mounting groove, the amount of magnets can be reduced, and the end ring and end plate can be assembled more stably.

In addition, since the end ring is formed in a fan-shaped enhancement and is formed in a shape spaced apart from each other along the circumferential direction centered on the rotation axis, the end ring and the end plate have the effect of easily allowing the position of the end ring to be combined at a fixed position when manufacturing a rotor assembly.

In addition, since the end ring and end plate are formed in a rectangular shape, there is an effect in which the position of the end ring can be easily combined at a fixed position when manufacturing a rotor assembly.

FIG. 1 is a perspective view showing a rotor for a motor according to a first embodiment of the present invention.
Figure 2 is an exploded perspective view showing an exploded state of a rotor for a motor according to the first embodiment of the present invention.
Fig. 3 is a cross-sectional view taken along line A-A' shown in Fig. 1.
Figure 4 is a partially exploded perspective view showing a partially exploded state of a rotor for a motor according to a second embodiment of the present invention.
FIG. 5 is a partially exploded perspective view showing a partially exploded state of a rotor for a motor according to a third embodiment of the present invention.
Figure 6 is a partially exploded perspective view showing a partially exploded state of a rotor for a motor according to a fourth embodiment of the present invention.

The advantages and features of the present invention, and the methods for achieving them, will become clear with reference to the embodiments described in detail below together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only these embodiments are provided to make the disclosure of the present invention complete, and to fully inform a person having ordinary skill in the art to which the present invention pertains of the scope of the invention, and the present invention is defined by the description of the claims. Meanwhile, the terminology used in this specification is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated in the phrase. The terms "comprises" or "comprising" as used in the specification do not exclude the presence or addition of one or more other components, steps, operations, and/or elements other than the mentioned components, steps, operations, and/or elements.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

Referring to FIGS. 1 to 6, a rotor for a motor according to the present embodiment includes a rotating body (100), a rotating shaft (200), a magnet (300), an end ring (400), and an end plate (500).

The rotating body (100) is rotatably accommodated in the inner space of an IPM (INTERIOR PERMANENT MAGNET) type motor stator, and is preferably formed by vertically stacking a plurality of electrical steel plates face to face.

And, the rotating body (100) is formed in a cylindrical shape with a through hole (110) formed in the center, and a plurality of magnet installation parts (120) (120) are formed radially around the through hole (110).

Meanwhile, the rotating body (100) is formed in a cylindrical shape, and thus can rotate stably inside the stator due to the characteristics of its shape.

In addition, the rotating body (100) is described as being applied to an IPM type motor as an example, but can be applied to all electric drive devices, motors, starter generators, etc. that are used for eco-friendly automobiles and must generate large torque.

The through hole (110) is formed longitudinally from the center of the rotating body (100), and a rotating shaft (200) fixed to the stator passes through it.

That is, the through hole (110) is formed at the center of the rotating body (100), and the rotating shaft (200) passes through it, thereby allowing the rotating body (100) to rotate smoothly with respect to the stator around the rotating shaft (200).

The magnet installation part (120)(120) is formed in a number of pieces spaced apart from each other while maintaining equal spacing along the circumference centered on the through hole (110), and penetrates in the longitudinal direction of the rotating main body (100).

And, since the magnet installation part (120)(120) is formed in the rotating main body (100), the magnet (300) can be easily embedded in the rotating main body (100).

Accordingly, the magnet installation part (120)(120) is filled with air inside to reduce leakage of magnetic flux generated from the magnet (300).

The rotation shaft (200) is connected to the rotation body (100) by passing through a through hole (110) formed at the center of the rotation body (100).

Due to this, the rotating shaft (200) rotates together with the rotating main body (100) through interaction with the stator.

In addition, one end and the other end of the rotation shaft (200) are each fixed inside the stator, so that the rotation body (100) can be easily fixed inside the stator via the rotation shaft (200).

This rotation axis (200) includes a shaft body (210) and a support part (220).

The shaft body (210) is the body of the rotating shaft (200) and is formed longer than the rotating main body (100).

Due to this, the shaft body (210) penetrates the rotating body (100), and the end ring (400) and the end plate (500) can be easily coupled to one end and the other end of the shaft body (210).

The support member (220) extends radially along the outer circumference of the shaft body member (210) in one direction or the other direction to support the outer surface of the end plate (500).

That is, the support member (220) has an outer diameter larger than the outer diameter of the shaft body (210) and smaller than the outer diameter of the end plate (500), and the inner surface of the support member (220) is in contact with the outer surface of the end plate (500).

Due to this, the support member (220) can effectively prevent the rotating main body (100), end ring (400), and end plate (500) coupled to the shaft body (210) from being separated outwardly, and the rotating main body (100), end ring (400), and end plate (500) can be easily coupled to each other.

The magnet (300) is composed of a plurality of magnets corresponding to the magnet installation parts (120)(120), and is installed in the rotating main body (100) by penetrating each of the magnet installation parts (120)(120).

And, the magnet (300) generates a rotational force in the rotating body (100) through interaction with the stator.

These magnets (300) may also be made of magnets (300) depending on the specifications and usage environment of the product.

Additionally, the magnet (300) can generate a stable magnetic field without being supplied with electric energy from the outside, thereby allowing the rotor to rotate stably.

Meanwhile, the magnets (300) are installed in each of the magnet installation parts (120)(120), and for this purpose, the cross-sectional shape of the magnets (300) is formed in a shape corresponding to that of the magnet installation parts (120)(120).

Due to this, the magnet (300) can be easily installed in the magnet installation part (120)(120).

The end ring (400) is formed as a pair and is shaped like a donut, penetrating one end and the other end of the rotation shaft (200).

These end rings (400) penetrate one end and the other end of the rotating shaft (200), respectively, and are placed on one end and the other end of the rotating main body (100), respectively.

And, the end ring (400) is made up of the same number of poles as the magnet (300).

For example, when the number of magnets (300) is 12, the end ring (400) is composed of 6 each, and one end ring (400) is in contact with two magnets (300).

In addition, the end ring (400) is composed of four when the number of magnets (300) is eight, and one end ring (400) is in contact with two magnets (300).

Due to this, when manufacturing a rotor for a motor, it is possible to attach the end ring (400) at a certain position that matches the number of rotor poles.

In addition, the inner diameter of the end ring (400) is the same as the inner diameter of the through hole (110), and the outer diameter is the same size as the outer diameter of the rotating main body (100).

These end rings (400) are made of a magnetic material.

This allows the end ring (400) to increase the maximum magnetic flux in the effective gap, thereby improving output.

In particular, the end ring (400) can improve output by preventing output performance from deteriorating due to axial leakage and fringing magnetic flux in the rotating body (100).

Due to this, the end ring (400) made of a magnetic material has increased output performance compared to when a conventional end ring (400) made of a non-magnetic material is used, so that even if the number of laminated electrical steel plates forming the rotating body (100) is reduced, the weight of the motor rotor can be reduced while maintaining the same output performance as when a non-magnetic end ring (400) is used.

Meanwhile, the end ring (400) made of a magnetic material is magnetized in the axial direction.

Due to this, the end ring (400) can prevent the electrical steel plate of the laminated rotating body (100) from being lifted and the magnet (300) can be prevented from being detached from the magnet installation part (120)(120) to the outside.

Additionally, the power density and mechanical rigidity can be increased.

Additionally, it is preferable that the pair of end rings (400) have the same thickness.

Due to this, the end ring (400) can further improve the performance of the rotor.

The end plates (500) are formed as a pair and are respectively positioned on the outer surfaces of a pair of end rings (400) by penetrating one end and the other end of the rotation shaft (200).

These end plates (500) maintain the rotational balance of the rotating main body (100) at a constant level, thereby preventing vibration caused by weight deviation during high-speed rotation of the rotating main body (100).

And, the end plate (500) is made of a non-magnetic material such as plastic.

Since the end plate (500) is made of a non-magnetic material, leakage of magnetic flux generated from the magnet (300) can be prevented.

Meanwhile, in the first embodiment of the present invention, the end ring (400) and the end plate (500) are described as having the same inner and outer diameters and the end plate (500) contacting the outer surface of the end ring (400), but in the second embodiment of the present invention, as shown in FIG. 4, the end ring (401) is configured to be mounted in the end ring mounting groove (501) of the end plate (500).

Specifically, in the second embodiment of the end ring (401) and the end plate (500), the inner diameter of the end ring (401) is larger than the inner diameter of the through hole (110), and the outer diameter is smaller than the outer diameter of the rotating body (100).

Additionally, an end ring mounting groove (501) is formed in the end plate (500).

The end ring mounting home (501) is formed in a shape corresponding to the end ring (401) on the mutually facing surface, and a pair of end rings (401) are mounted on each.

Additionally, the depth of the end ring mounting groove (501) is the same as the thickness of the end ring (401).

That is, since the end ring (401) is covered by the end ring mounting groove (501), the end ring (401) is prevented from being exposed to the outside by the end ring mounting groove (501).

In addition, since the end ring (401) is mounted in the end ring mounting groove (501), the amount of magnets can be reduced compared to the end ring (401) and end plate (500) according to the first embodiment of the present invention, and since the end ring mounting groove (501) is formed in the conventional end plate (500) and used, the end ring (401) and end plate (500) can be assembled more stably.

Meanwhile, in the first and second embodiments of the present invention, the end ring (400, 401) was described as having a donut shape, but the end ring (402) according to the third embodiment of the present invention is formed as a fan-shaped enhancement as shown in FIG. 5, and is formed in a shape spaced apart from each other along the circumferential direction with the rotation axis (200) as the center.

Accordingly, the end ring mounting groove (502) of the end plate (500) according to the third embodiment of the present invention is formed in a shape corresponding to the end ring (402) according to the third embodiment of the present invention, so that a partition (502') is formed between a plurality of end rings (402).

Due to this, the end ring (402) and the end plate (500) according to the third embodiment of the present invention can easily be combined at a fixed position when manufacturing a rotor assembly.

Meanwhile, in the third embodiment of the present invention, the end ring (402) was described as being formed by a body-shaped enhancement, but the end ring (403) according to the fourth embodiment of the present invention is formed in a rectangular shape as shown in FIG. 6, and is formed in a shape spaced apart from each other along the circumference centered on the rotation axis (200).

Accordingly, the end ring mounting groove (503) of the end plate (500) according to the fourth embodiment of the present invention is formed in a shape corresponding to the end ring (403) according to the fourth embodiment of the present invention, so that a partition (503') is formed between a plurality of end rings (403).

Due to this, the end ring (403) and end plate (503) according to the fourth embodiment of the present invention do not have curved surfaces like those of the first to third embodiments, so that when manufacturing a rotor assembly, the end ring (403) can be more easily combined at a fixed position compared to the first to third embodiments.

As described above, the rotor for the motor of the present invention has an outer diameter of the support (220) that is larger than the outer diameter of the shaft body (210) and smaller than the outer diameter of the end plate (500), so that the inner surface of the support (220) is in contact with the outer surface of the end plate (500), thereby effectively preventing the rotating body (100), the end ring (400, 401, 402, 403), and the end plate (500) coupled to the shaft body (210) from being detached outward, and the rotating body (100), the end ring (400, 401, 402, 403), and the end plate (500) can be easily coupled to each other.

And, since the end rings (400, 401, 402, 403) are made of a magnetic material, the end rings (400, 401, 402, 403) can increase the maximum magnetic flux in the effective gap, thereby improving the output, and can further improve the output by preventing the output performance from deteriorating due to axial leakage and fringing magnetic flux in the rotating body (100).

Accordingly, the end ring (400, 401, 402, 403) made of a magnetic material increases the output performance compared to when a conventional end ring made of a non-magnetic material is used, so that even if the number of electrical steel plates forming the rotating body (100) is reduced, the same output performance as when a non-magnetic end ring is used can be maintained, and the weight of the motor rotor can be reduced.

In addition, since the end rings (400, 401, 402, 403) made of a magnetic body are axially magnetized, the end rings (400, 401, 402, 403) can prevent the electrical steel plate of the laminated rotating body (100) from being lifted and prevent the magnet (120) from being detached from the magnet installation part (120) to the outside.

In addition, since the end plate (500) is made of a non-magnetic material, leakage of magnetic flux generated from the magnet (300) can be prevented.

And, since the end rings (401, 402, 403) are mounted in the end ring mounting grooves (501, 502, 503), the amount of magnets can be reduced, and the end rings (401, 402, 403) and the end plate (500) can be assembled more stably.

In addition, since the end ring (402) is formed in a fan-shaped enhancement and is formed in a shape spaced apart from each other along the circumferential direction centered on the rotation axis (200), the end ring (402) and the end plate (500) can be easily combined at a fixed position when manufacturing the rotor assembly.

In addition, since the end ring (403) and the end ring mounting groove (503) are formed in a rectangular shape, the position of the end ring (403) can be easily combined at a certain position when manufacturing the rotor assembly.

The present invention is not limited to the above-described embodiments, and can be implemented by making various modifications within the scope permitted by the technical idea of the present invention.

100: Rotating body 110: Through hole
120: Magnet installation part 200: Rotating shaft
210: Axial body 220: Supporting part
300: Magnet 400, 401, 402, 403: End ring
500: End plate 501, 502, 503: End ring mounting groove

Claims (14)

A rotating main body that is rotatably accommodated in the inner space of a motor stator, has a through hole formed in the center, and has a plurality of magnet installation sections formed radially around the through hole;
A rotating shaft coupled to the rotating main body by penetrating the above through hole;
A plurality of magnets installed in the rotating main body through the magnet installation section and generating rotational force in the rotating main body through interaction with the stator; and
A pair of end rings each penetrating one end and the other end of the above-mentioned rotary shaft and each positioned on one side and the other side of the above-mentioned rotary body;
A pair of end plates each penetrating one end and the other end of the above-mentioned rotation shaft and each disposed on the outer surface of a pair of the above-mentioned end rings;
A pair of the above end plates,
An end ring mounting groove is formed on each side facing each other, and a pair of end rings are mounted thereon, each having a shape corresponding to the end ring.
The above end ring mounting groove is formed on a surface of the end plate in the direction in which the rotating main body is arranged, so that when the end ring is mounted in the end ring mounting groove, the end ring and the rotating main body come into surface contact with each other.
The above end ring is,
They are spaced apart from each other along the circumference with the above rotation axis as the center,
In the above end ring mounting home,
A partition is formed between a plurality of said end rings spaced apart from each other.
Rotor for in-motor.
In the first paragraph,
The above end ring is made of a magnetic material.
Rotor for in-motor.
In the second paragraph,
The cross-section of the above magnet is formed in a shape corresponding to the magnet installation portion.
Rotor for in-motor.
In the second paragraph, the rotation axis is,
A shaft body longer than the above rotating main body; and
A support member that extends radially along the outer circumference of the shaft body in one direction of the shaft body and supports the outer surface of the end plate;
Rotor for in-motor.
In the second paragraph,
The thickness of the above pair of end rings shall be mutually identical.
Rotor for in-motor.
In the second paragraph,
The inner diameter of the above end ring is the same as the inner diameter of the above through hole, and the outer diameter is the same as the outer diameter of the above rotating body.
Rotor for in-motor.
In the second paragraph,
The above end ring is made up of the same number of poles as the magnet.
Rotor for in-motor.
In the second paragraph,
The above end ring is axially magnetized.
Rotor for in-motor.
In the second paragraph,
The above end plate is made of a non-magnetic material.
Rotor for in-motor.
In the second paragraph,
The inner diameter of the above end ring is larger than the inner diameter of the above through hole, and the outer diameter is smaller than the outer diameter of the above rotating body.
Rotor for in-motor.
delete In Article 10,
The depth of the above end ring mounting groove is the same as the thickness of the above end ring.
Rotor for in-motor.
In the 12th paragraph, the end ring,
Fan-shaped
Rotor for in-motor.
In the 12th paragraph, the end ring,
Consisting of a rectangular shape
Rotor for in-motor.

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