WO2019098809A1

WO2019098809A1 - Rotor for electric motor, electric motor comprising same, supercharger comprising same, and assembly method for electric motor

Info

Publication number: WO2019098809A1
Application number: PCT/KR2018/014265
Authority: WO
Inventors: 홍도관; 김동준; 김지원; 안민혁; 우병철; 이정욱; 정연호
Original assignee: 한국전기연구원
Priority date: 2017-11-20
Filing date: 2018-11-20
Publication date: 2019-05-23
Also published as: KR102632406B1; CN111373639A; CN111373639B; KR20190058339A

Abstract

The present invention relates to an electric motor and, more particularly, to an electric motor and an assembly method therefor. The present invention provides a rotor for an electric motor, the rotor comprising: a rotary shaft (100) which is rotatably installed in a motor housing; and a hollow rotor portion (300) into which the rotary shaft (100) is fitted and which is rotated together with the rotary shaft (100), wherein the rotary shaft (100) comprises: a first support hub (110) which protrudes radially from the outer circumferential surface of the rotary shaft (100) so as to support one side of the rotor portion (300) into which the rotary shaft (100) is fitted; and a second support hub (120) which is detachably coupled to the rotary shaft (100) so as to fix the rotor portion (300) to the rotary shaft (100) by tightly pressing, toward the first support hub (110), the other side of the rotor portion (300) which is supported on one side thereof by the first support hub (110) while the rotary shaft (100) is fitted into the rotor portion (300).

Description

Method for assembling a rotor of an electric motor, an electric motor having the electric motor, a supercharger having the same, and an electric motor

The present invention relates to an electric motor, and more particularly, to a rotor of an electric motor, an electric motor having the electric motor, a supercharger having the electric motor, and a method of assembling the electric motor.

An electric motor is a device composed of a rotor and a stator and is a device that generates power by applying a power to at least one of a rotor and a stator to change a magnetic force between the stator and the rotor.

For example, an electric motor includes a stator installed on an inner circumferential side of a motor housing to apply power to a plurality of coils to form a magnetic field, a permanent magnet installed inside the stator and rotatably mounted to the motor housing, And a rotor rotated by a change in the magnetic field formed by the stator.

On the other hand, the rotor including the permanent magnet includes a cylindrical rotor iron core core and a cylindrical permanent magnet provided on the outer circumferential side of the rotor iron core core. After the cylindrical rotor iron core core is press-fitted into the outer peripheral side of the rotation shaft A cylindrical permanent magnet is generally press-fitted into the outer peripheral side of the rotor core.

However, in the rotor structure of the conventional motor having the above-described configuration, axial slippage occurs due to an assembly error or the like despite the press-fitting of the rotary shaft, and an unbalance may occur in the weight of the rotor in the axial direction.

In particular, when an unbalance is generated in the self weight of the rotor, vibration of the motor is generated.

It is an object of the present invention to provide a method of assembling a rotor of an electric motor, an electric motor having the electric motor, a supercharger having the electric motor, and an electric motor, There is.

The present invention has been made in order to achieve the above-mentioned object of the present invention, and it is an object of the present invention to provide an electric motor comprising: a rotary shaft rotatably installed in a motor housing; The rotary shaft 100 includes a hollow rotor 300 coupled to the rotary shaft 100 and rotatable together with the rotary shaft 100. The rotary shaft 100 is rotatably coupled to the rotary shaft 300, A first support hub 110 protruding radially from an outer circumferential surface of the rotary shaft 100 to support one side of the rotary shaft 100; The other end of the rotor 300 supported by the first support hub 110 is brought into close contact with the first support hub 110 while the rotary shaft 100 is inserted, And a second support hub (120) detachably coupled to the rotary shaft (100) so as to be fixed to the rotary shaft (100).

The rotor 300 includes a rotor core 310 inserted into the outer periphery of the rotating shaft 100; At least one permanent magnet (320) coupled to an outer circumferential surface of the rotor core (310); And a fixing part 330 for fixing the permanent magnet 320 coupled to the rotor core 310 to the rotary shaft 100.

The one or more permanent magnets 320 may have a circular shape perpendicular to the longitudinal direction of the rotary shaft 100.

The one or more permanent magnets 320 may have a pair of semicircular phases divided in half from the center of the rotary shaft 100 on the basis of a vertical plane perpendicular to the longitudinal direction of the rotary shaft 100.

The first and

second support hubs

120 and 120 may be installed between one side of the rotor 300 and the first support hub 110 and between the other side of the rotor 300 and the

second support hub

120, 320 are formed at both ends of the rotor 300 in the longitudinal direction of the rotary shaft 100 and are elastically deformable in the longitudinal direction of the rotary shaft 100. A pair of cushioning members 341 ). &Lt; / RTI >

The pair of cushioning members 341 may be formed so as to prevent the fixing portion 330 provided on the cylindrical outer circumferential surface of the at least one permanent magnet 320 from moving in the longitudinal direction of the rotary shaft 100, Can be formed.

The pair of buffer members 341 may have an engineering plastic material.

The first supporting hub 110 is screwed to the male screw portion 132 formed on the outer circumferential surface of the rotating shaft 100 to support the other side of the rotor 300 pressed by the second supporting hub 120 can do.

The fixing portion 330 may be formed of a film member that is installed to surround the outer circumferential surface of the at least one permanent magnet 320 at least once.

The film member may include a carbon sheet.

The rotary shaft 100 may be provided with bearings on both sides of the rotor 300 so as to be rotatable with respect to the motor housing.

The outer diameter of the rotary shaft 100 may be smaller than the outer diameter of the portion where the rotary shaft 300 is installed.

The rotary shaft 100 is provided at one end with an encoder 200 for controlling the rotation of the motor, and the other end can constitute a driving shaft.

The second support hub 120 may be a nut member screwed to the male screw portion 131 formed on the rotary shaft 100.

The first support hub 110 and the second support hub 120 may be partially removed by a processing mechanism to reduce the vibration when the rotor 300 is coupled.

The present invention also relates to a motor vehicle comprising: a motor housing (20); A stator 26 installed on the inner circumferential surface of the motor housing 20; A motor (10) rotatably installed in the motor housing (20) inside the stator (26) includes a rotor (10) having the above configuration.

The present invention also includes: an impeller housing (30) forming an air flow path that sucks in the axial direction and discharges in a radial direction; An impeller (31) rotated in the impeller housing (30) to discharge high - pressure air through the air passage formed in the impeller housing (30); And an electric motor having the above-described structure, wherein the impeller (31) is coupled to a drive shaft to rotate the impeller (31).

The present invention also relates to an electric motor assembling method for assembling an electric motor including a rotor of an electric motor having the above-described configuration, wherein a first supporting hub (110) protruding in a radial direction from an outer circumferential surface of the rotating shaft (100) A rotating shaft inserting step of inserting the rotating shaft 100 into the hollow of the rotor 300 so as to be supported; The other end of the rotor 300 supported by the first support hub 110 is brought into close contact with the first support hub 110 while the rotary shaft 100 is inserted, And a second support hub coupling step of coupling the second support hub (120) to the rotation shaft (100) in a detachable manner to fix the second support hub (120) to the rotation shaft (100).

The step of inserting the rotating shaft may include the step of inserting a cylindrical outer circumferential surface in which the at least one permanent magnet 320 is formed between one side of the rotor 300 and the first supporting hub 110, A cushioning member 341 extending from one end of the rotor 300 and elastically deformable in the longitudinal direction of the rotary shaft 100 is installed on the rotor 300, A cylindrical outer circumferential surface in which the at least one permanent magnet 320 is formed between the other side and the second support hub 120 is extended from the other end of the rotor 300 in the longitudinal direction of the rotary shaft 100, A cushioning member 341 capable of elastically deforming in the longitudinal direction of the rotary shaft 100 can be provided.

The fixing part 330 may be formed by a film member that is installed to surround the at least one permanent magnet 320 at least once on the outer circumferential surface thereof.

After the second support hub coupling step, the rotor in the state where the rotor 300 is engaged is rotated to measure the vibration pattern, and the vibration of the rotor is measured by using a processing mechanism to reduce the vibration of the rotor. A balancing step of removing the hub 110 and a portion of the second support hub 120 may be performed.

According to the present invention, there is provided a rotor of an electric motor, an electric motor having the electric motor, a supercharger having the electric motor, and an electric motor, comprising a rotary shaft integrally formed with a first support hub for supporting one side of the rotor, By securing the second supporting hub to the rotating shaft by screwing the rotating part in the state of being supported by the supporting hub by the first supporting hub and the second supporting hub, it is possible to prevent slipping of the rotor coupled to the rotating shaft, There is one advantage.

A method of assembling a rotor of an electric motor, an electric motor having the electric motor, a supercharger having the same, and an electric motor according to the present invention is characterized by including a rotor having a metallic material and a first supporting hub for supporting both sides of the rotor, An engineering plastic capable of elastic deformation such as PEEK is interposed to compensate for machining errors and assembling errors of the motor, thereby making it possible to manufacture a more precise motor.

The method of assembling a rotor of an electric motor, an electric motor having the electric motor, a supercharger having the same, and an electric motor according to the present invention is characterized by a rigid rotor fixing structure using a first supporting hub and a second supporting hub, And the final balancing process is advantageous in that it is suitable for high-speed rotation and can be downsized in a supercharger requiring a high-speed rotation due to a solid structure and optimized balancing.

1 is a perspective view of a motor according to a first embodiment of the present invention.

Fig. 2 is an exploded perspective view of a portion of the motor shown in Fig. 1; Fig.

Fig. 3 is a longitudinal sectional view of Fig. 1. Fig.

Fig. 4 is an enlarged view of the rotor portion in Fig. 3; Fig.

5 is a cross-sectional view taken along the line IV-IV in Fig.

6 is an exploded view showing an assembling structure of the electric motor of Fig.

7 is an exploded perspective view of a portion of an electric motor according to a second embodiment of the present invention.

Fig. 8 is a longitudinal sectional view of Fig. 7. Fig.

9 is an exploded view showing an assembling structure of the motor of Fig.

FIG. 10 is a cross-sectional view showing a schematic example of a supercharger to which the electric motor shown in FIG. 1 is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of assembling a motor, a motor having the motor, a supercharger having the motor, and a motor according to the present invention will be described with reference to the accompanying drawings.

The electric motor according to the present invention is an electric motor having a rotor 10 having permanent magnets 320 as shown in Fig. 10, and is provided with a motor housing 20, a motor housing 20, And a rotor 10 rotatably installed in the motor housing 20 and having permanent magnets 320. The permanent magnets 320 are rotatably mounted on the motor housing 20,

The motor housing 20 has a structure for installing the stator 26 and the rotor 10, and may have various structures depending on applications in which the electric motor is used.

For example, the motor housing 20 includes a hollow cylinder 21 having both sides open, a cover member 20 for rotatably supporting the rotary shaft 100 of the rotor 10 at both ends of the hollow cylinder 21, (22, 23) can be coupled.

One side of the motor housing 20 protrudes to the outside so that the rotary shaft 100 rotatably driven according to the use of the motor is used as a driving shaft and the other side is connected to a control unit 25 can be coupled to the control housing 24.

An impeller or the like may be coupled to the drive shaft portion of the rotary shaft 100 according to the use of the motor.

The stator 26 is configured to rotate the rotor 10 by a magnetic force acting on the rotor 10 having the permanent magnets 320 and may be composed of a plurality of coil windings 27 .

The rotor 10 has a permanent magnet 320 installed in the motor housing 20 so as to be rotatable.

1 to 6, the rotor 10 of the electric motor according to the present invention is rotatably mounted on the motor housing 20, A rotary shaft 100 installed to be rotatable; And a hollow rotor 300 coupled to the rotating shaft 100 and coupled therewith and rotated together with the rotating shaft 100.

The rotary shaft 100 is rotatably installed in the motor housing to generate a rotational driving force, and can have various constructions.

For example, the rotary shaft 100 includes a first support hub 110 protruding radially from the outer circumferential surface of the rotary shaft 100 to support one side of the rotor 300 having the rotary shaft 100 inserted therein; The other end of the rotor 300 supported by the first support hub 110 is brought into close contact with the first support hub 110 side while the rotary shaft 100 is inserted and the rotor 300 is coupled to the rotary shaft 100 And a second support hub 120 detachably coupled to the rotary shaft 100 so as to be fixed.

The first support hub 110 is configured to protrude in the radial direction from the outer circumferential surface of the rotary shaft 100 to support one side of the rotor 300 having the rotary shaft 100 inserted therein. And the rotor 300 may be fixed together with the rotor.

For example, the first support portion 110 may be formed integrally protruding radially from the outer circumferential surface of the rotary shaft 100, as shown in FIGS. 2, 3, and 6.

Particularly, the first supporting hub 110 is formed integrally with the outer peripheral surface of the rotary shaft 100 in the radial direction so as to support one side of the rotor 300 in the axial direction. When viewed in the direction of the rotary shaft 100, It is preferable to have a disc shape larger than the outer diameter of the rotary shaft 100. [

The first support hub 110 may be partially removed by a machining apparatus such as a milling machine to balance the axial balancing, that is, the rotational moment of inertia after the rotor 300 is engaged.

7 to 9, the first support hub 110 may be integrally formed with the second support hub 120 in a similar manner to the second support hub 120 described later, instead of integrally protruding from the outer circumferential surface of the rotation shaft 100. [ (Not shown).

The detachable structure of the first supporting hub 110 with respect to the rotating shaft 100 may be formed by various methods such as being coupled to the rotating shaft 100 for screw coupling, Can be combined.

That is, the first support hub 110 includes a nut member formed on an inner circumferential surface thereof, and a female screw portion 112 screwed to the male screw portion 132 formed on the outer circumferential surface of the rotary shaft 100, To support the other side of the rotor 300 that is pressurized.

In particular, when the first support hub 110 is detachably mounted on the rotary shaft 100, the second support hub 120 may be symmetrical with the second support hub 120.

On the other hand, the material of the rotating shaft 100 can be used as an inconel material having good heat resistance.

The rotating shaft 100 is a shaft rotatably installed in the motor housing except for the first supporting hub 110 and the second supporting hub 120. The rotating shaft 100 includes a rotor 300, And a coupling structure of the object to be rotational-driven which is rotationally driven by the rotation of the rotor.

The second support hub 120 has a structure in which the other side of the rotor 300 supported by the first support hub 110 is closely contacted to the first support hub 110 in a state where the rotary shaft 100 is fitted, And can be variously configured as a structure detachably coupled to the rotary shaft 100 so as to fix the female part 300 to the rotary shaft 100.

For example, the second support hub 100 may be coupled to the rotary shaft 100 in a variety of ways, such as being coupled for threaded engagement.

That is, the second support hub 120 may include a nut member formed on the inner circumferential surface thereof with a female screw portion 122 screwed to the male screw portion 131 formed on the rotary shaft 100.

Meanwhile, the first and

second support hubs

110 and 120 may be partially removed by a processing mechanism in order to reduce the vibration during rotation when the rotor 300 is engaged.

That is, the second support hub 120 is formed by machining, such as a milling machine, in order to balance the axial balancing, that is, the rotational moment of inertia after the rotor 300 is coupled, similar to the first support hub 110 described above The part can be removed by the device.

As the material of the second support hub 120, a metal such as brass may be used.

One or more permanent magnets 320 are formed on one side of the rotor 300 and between the first support hubs 110 and on the other side of the rotor 300 and between the second support hubs 120 A pair of cushioning members 341 extending from both ends of the rotary part 300 in the longitudinal direction of the rotary shaft 100 and capable of being elastically deformed in the longitudinal direction of the rotary shaft 100 are further preferably provided Do.

The pair of cushioning members 341 are installed on one side of the rotor 300 and between the first support hubs 110 and on the other side of the rotor 300 and between the second support hubs 120 The outer circumferential surface of the cylinder in which at least one permanent magnet 320 is formed is extended from both ends of the rotor 300 in the longitudinal direction of the rotary shaft 100 and can be elastically deformed in the longitudinal direction of the rotary shaft 100 This is possible.

The rotary shaft 100 is inserted so as to be positioned between one side of the rotor 300 and the first support hub 110 and between the other side of the rotor 300 and the second support hub 120 And may have various shapes such as being formed by a circular ring.

Meanwhile, the pair of buffer members 341 may have a step for preventing the fixing portion 330 provided on the cylindrical outer circumferential surface on which the at least one permanent magnet 320 is formed from moving in the longitudinal direction of the rotary shaft 100 .

Specifically, when the fixing portion 330, which will be described later, is installed on the outer circumferential surface of the permanent magnet 320, a slip may be generated in the axial direction. To prevent this, A step 342 is formed.

At this time, the height of the first step 342 preferably has a height corresponding to the thickness of the fixing part 330 in order to form a gentle surface together with the outer peripheral surface of the fixing part 330 described later.

It is preferable that the pair of buffer members 341 have an outer diameter larger than the outer diameters of the first and

second support hubs

110 and 120 described above.

The pair of cushioning members 341 may include a first support hub 110 and a second support hub 120 so that the first support hub 110 and the second support hub 120 may be axially recessed, The second step 343 is formed at a position corresponding to the second step 343.

The first support hub 110 and the second support hub 120 are formed to have a sufficient thickness in the axial direction and to prevent the rotation of the rotor 300 in the direction of the rotation axis 100 The overall length can be minimized.

It is preferable that the pair of buffer members 341 have an engineering plastic material such as PEEK that can be elastically deformed.

Meanwhile, the rotary shaft 100 may be provided with bearings (not shown) on both sides of the rotor 300 so as to be rotatable relative to the motor housing.

The outer diameter of the portion 130 where the bearing is installed is preferably smaller than the outer diameter of the portion where the rotary shaft portion 300 is installed.

In addition, an encoder 200 for controlling the rotation of the motor may be provided at one end of the rotary shaft 100, and the other end may constitute a drive shaft.

At this time, the rotary shaft 100 may be formed with an axial insertion part 150 for installation of the encoder 200.

Of course, the mounting positions of the drive shaft and the encoder 200 at both ends of the rotary shaft 100 can be reversed for convenience.

The rotor 300 may have various configurations as a hollow configuration in which the rotary shaft 100 is fitted and coupled and rotated together with the rotary shaft 100.

For example, the rotor 300 includes a rotor core 310 inserted into the outer periphery of the rotating shaft 100; At least one permanent magnet (320) coupled to an outer circumferential surface of the rotor core (310); And a fixing portion 330 for fixing the permanent magnet 320 coupled to the rotor core 310 to the rotary shaft 100.

The rotor core 310 is inserted into the outer peripheral side of the rotating shaft 100, and a plurality of iron cores are laminated to constitute a rotor core of the electric motor.

Here, the rotor core 310 has a through hole 311 formed at a central portion thereof so that the rotating shaft 100 is press-fitted.

The permanent magnets 320 are coupled to the outer circumferential surface of the rotor core 310 and may have various configurations.

For example, the permanent magnet 320 may have a circular shape in a longitudinal direction perpendicular to the longitudinal direction of the rotating shaft 100.

As described above, when the one or more permanent magnets 320 have a pair of semicircular phases divided in half from the center of the rotary shaft 100 on the basis of the vertical plane perpendicular to the longitudinal direction of the rotary shaft 100, There is an advantage that the permanent magnets having rigidity can be easily coupled.

Particularly, conventionally, there is a problem that the permanent magnet is press-fitted into the outer circumferential surface of the rotor core 310 in a shape similar to that of the rotor core 310. However, If a pair of semicircular phases are provided, there is an advantage that the permanent magnets having relatively weak stiffness can be easily coupled.

The fixing part 330 may be configured to fix the permanent magnet 320 coupled to the rotor core 310 to the rotary shaft 100 and may have various configurations such as an epoxy and a film.

For example, the fixing part 330 may be formed of a film member that is installed to surround the at least one permanent magnet 320 at least once on the outer circumferential surface thereof.

More specifically, the film member may include a carbon sheet.

On the other hand, the electric motor having the above-described structure, particularly the rotary shaft and the rotor, can be assembled and completed by the following method.

First, the rotating shaft 100 is inserted into the rotor core 310. The cushioning member 341 may be positioned between the first support hub 110 and the rotor core 310 prior to insertion of the rotor core 310 when the cushioning member 341 is interposed therebetween, Is inserted into the rotary shaft (100) before the rotor core (310).

After the rotor core 310 is inserted, the second support hub 120 is fixed to the rotor core 210 by moving the rotor core 210 toward the first support hub 110 by screwing.

When the buffer member 341 is interposed between the rotor core 310 and the second support hub 120, a cushioning member 341 is disposed between the second support hub 120 and the cushioning member 341, Is inserted into the rotating shaft (100) beforehand.

Meanwhile, the permanent magnets 320 may be installed in a state of being coupled with the rotor core 310 according to their structure, or may be arranged in a direction perpendicular to the rotation axis 100, that is, in a radial direction To the rotor core (310).

In this case, when the permanent magnets are integrated, the permanent magnets 320 are installed before the second supporting hub 120 is coupled.

When the permanent magnets 320 have a pair of semicircular vertical sections, the second support hub 120 may be coupled to the outer circumferential surface of the rotor core 310.

After the permanent magnets 320 are installed, a fixing part 330 is provided to protect the permanent magnets 320.

Specifically, the fixing portion 330 can be wound around the outer circumferential surface of the permanent magnet 320 as a film member such as CFRP (carbon fiber reinforced plastic).

More specifically, the fixing portion 330 may be formed by winding a film of CFRP material on the outer peripheral surface of the permanent magnet 320.

The fixing portion 330 may be formed by winding a carbon sheet around the outer circumferential surface of the permanent magnet 320 and impregnating and hardening the resin.

In this case, the fixing portion 330 is preferably provided on the outer circumferential surface of the permanent magnet 320 and the outer circumferential surface of the buffer member 341.

The fixing portion 330 is wound inside the first step 342 formed in the buffer member 341 to prevent the fixing portion 330 from slipping in the axial direction after the fixing portion 330 is installed.

6 and 9, the motor including the rotor of the motor having the above-described configuration is a method of assembling the motor in the radial direction A rotating shaft inserting step of inserting the rotating shaft 100 into the hollow of the rotor 300 so that one side is supported by the first supporting hub 110; The other end of the rotor 300 supported by the first support hub 110 is brought into close contact with the first support hub 110 side while the rotary shaft 100 is inserted and the rotor 300 is coupled to the rotary shaft 100 And a second support hub coupling step of coupling the second support hub (120) to the rotary shaft (100) so as to fix the second support hub (120).

The step of inserting the rotating shaft 100 is a step of inserting the rotating shaft 100 into the hollow of the rotor 300 so that one side is supported by the first supporting hub 110 protruding in the radial direction from the outer circumferential surface of the rotating shaft 100, .

The first support hub 110 may be coupled to the rotary shaft 100 before or after the coupling of the rotor 300 when the first support hub 110 is detachably coupled to the rotary shaft 100 as a separate member from the rotary shaft 100 .

The second support hub coupling step may be performed such that the other side of the rotor 300 supported by the first support hub 110 is closely contacted to the first support hub 110 side in a state where the rotary shaft 100 is fitted, The second support hub 120 is detachably coupled to the rotary shaft 100 to fix the first support shaft 300 to the rotary shaft 100 and may be performed by various methods.

When the first support hub 110 is detachably coupled to the rotary shaft 100 as a separate member from the rotary shaft 100, the first support hub 110 and the second support hub 110, After the support hub 120 first catches the reference position, the other one of the first and

second support hubs

110 and 120 can fix the rotor portion 300 positioned between the first and

second support hubs

120 and 120.

The coupling order of the first and

second support hubs

110 and 120 with respect to the rotation axis 100 is selected for convenience and the second support hub 120 is coupled to the rotation axis 100, 300 and the first support hub 110 can be engaged with each other.

Meanwhile, in the step of inserting the rotating shaft, the outer circumferential surface of the cylinder, in which the one or more permanent magnets 320 are formed between one side of the rotor 300 and the first supporting hub 110, A cushioning member 341 extending from one end of the rotor 300 and capable of elastically deforming in the longitudinal direction of the rotary shaft 100 may be provided.

The second support hub coupling step may be performed by connecting a cylindrical outer circumferential surface on which the at least one permanent magnet 320 is formed between the other side of the rotor 300 and the second support hub 120, A cushioning member 341 extending from the other end of the rotor 300 in the longitudinal direction of the rotary shaft 100 and elastically deformable in the longitudinal direction of the rotary shaft 100 may be provided.

The fixing part 330 for fixing the permanent magnet 320 is formed by a film member which is installed to surround the outer peripheral surface of the at least one permanent magnet 320 at least once, .

After the second supporting hub coupling step, the rotor in the state in which the rotor 300 is engaged is rotated to measure the vibration pattern. In order to reduce the vibration of the rotor, A balancing step of removing the support hub 110 and a portion of the second support hub 120 may be performed.

On the other hand, the motor according to the present invention having the above-described structure can be downsized and has a rigid structure suitable for high-speed rotation, and is suitable for use in a high-speed rotation environment.

The electric motor according to the present invention can be applied to rotationally drive the impeller (31) of the supercharger for applying pressure to the intake air in the engine by driving the electric motor at a high speed.

10, the electric driving supercharger to which the electric motor according to the present invention is applied includes an impeller housing 30 that forms an air flow path that is sucked in the axial direction and discharges in a radial direction, The impeller 31 is coupled to the drive shaft to rotate the impeller 31 and to rotate the impeller 31. The impeller 31 rotates within the impeller housing 30 and discharges high- &Lt; / RTI >

The impeller housing 30 is configured to form an air flow path which is sucked in the axial direction and discharged in the radial direction.

For example, the impeller housing 30 has an inlet port in the axial direction and a discharge port formed in a direction in contact with the circumferential direction of the impeller 31. The inlet port and the outlet port are formed, and the air flow path is formed so as to have a compression ratio required as a supercharger Any configuration is possible as long as it is formed.

The impeller 31 may have various structures depending on a compression ratio required as a supercharger, such as a structure in which the impeller 31 is coupled to the drive shaft of the electric motor, that is, the rotary shaft 100 described above.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

Claims

A rotary shaft (100) rotatably installed in the motor housing;

And a hollow rotor 300 coupled with the rotation shaft 100 and rotated together with the rotation shaft 100,

The rotation shaft (100)

A first support hub 110 protruding in a radial direction from an outer circumferential surface of the rotary shaft 100 to support one side of the rotor 300 in which the rotary shaft 100 is inserted;

The other end of the rotor 300 supported by the first support hub 110 is brought into close contact with the first support hub 110 while the rotary shaft 100 is inserted, And a second support hub (120) detachably coupled to the rotary shaft (100) so as to be fixed to the rotary shaft (100).
The method according to claim 1,

The rotor 300 includes:

A rotor core (310) inserted into the outer periphery of the rotary shaft (100);

At least one permanent magnet (320) coupled to an outer circumferential surface of the rotor core (310);

And a fixing part (330) for fixing the permanent magnet (320) coupled to the rotor core (310) to the rotating shaft (100).
The method of claim 2,

Wherein the one or more permanent magnets (320) have a shape of a vertical section perpendicular to the longitudinal direction of the rotary shaft (100).
The method of claim 3,

Wherein the at least one permanent magnet (320) has a pair of semicircular phases divided in half at a center of the rotary shaft (100) with respect to a vertical plane perpendicular to the longitudinal direction of the rotary shaft (100) Of the rotor.
The method of claim 3,

The first and second support hubs 120 and 120 may be installed between one side of the rotor 300 and the first support hub 110 and between the other side of the rotor 300 and the second support hub 120, 320 are formed at both ends of the rotor 300 in the longitudinal direction of the rotary shaft 100 and are elastically deformable in the longitudinal direction of the rotary shaft 100. A pair of cushioning members 341 &Lt; / RTI > further comprising:
The method of claim 5,

The pair of cushioning members 341 may be formed so as to prevent the fixing portion 330 provided on the cylindrical outer circumferential surface of the at least one permanent magnet 320 from moving in the longitudinal direction of the rotary shaft 100, Is formed on the outer circumferential surface of the rotor.
The method of claim 5,

Wherein the pair of buffer members (341) has an engineering plastic material.
The method according to claim 1,

The first supporting hub 110 is screwed to the male screw portion 132 formed on the outer circumferential surface of the rotating shaft 100 to support the other side of the rotor 300 pressed by the second supporting hub 120 And the rotor is rotated.
The method according to any one of claims 2 to 8,

Wherein the fixing part (330) is a film member that is installed to surround the one or more permanent magnets (320) at least once on the outer circumferential surface thereof.
The method of claim 9,

Wherein the film member comprises a carbon sheet.
The method according to any one of claims 1 to 8,

Wherein the rotary shaft (100) is provided with bearings on both sides of the rotor (300) so as to be rotatably mounted on the motor housing.
The method of claim 11,

Wherein an outer diameter of a portion of the rotary shaft (100) where the bearing is installed is formed to be smaller than an outer diameter of a portion where the rotary shaft portion (300) is installed.
The method according to any one of claims 1 to 8,

Wherein the rotary shaft (100) is provided at one end with an encoder (200) for controlling the rotation of the motor, and the other end forms a driving shaft.
The method according to any one of claims 1 to 8,

Wherein the second support hub (120) is a nut member screwed to the male screw portion (131) formed on the rotary shaft (100).
The method according to any one of claims 1 to 8,

The first support hub (110) and the second support hub (120) are partly removed by a processing mechanism to reduce vibration during rotation when the rotor (300) is engaged. Of the rotor.
A motor housing (20);

A stator 26 installed on the inner circumferential surface of the motor housing 20;

The rotor 10 rotatably installed in the motor housing 20 inside the stator 26 includes the rotor 10 according to any one of claims 1 to 8. An electric motor.
An impeller housing (30) which forms an air flow path which is sucked in the axial direction and discharged in a radial direction;

An impeller (31) rotated in the impeller housing (30) to discharge high - pressure air through the air passage formed in the impeller housing (30);

Wherein the impeller (31) is coupled to a drive shaft to rotate the impeller (31), and the motor according to Claim 16.
A motor assembling method for assembling an electric motor including a rotor of an electric motor according to any one of claims 1 to 5,

A rotation axis inserting step of inserting the rotation axis 100 into the hollow of the rotor 300 so that one side is supported by a first support hub 110 protruding in a radial direction from the outer circumference of the rotation axis 100;

The other end of the rotor 300 supported by the first support hub 110 is brought into close contact with the first support hub 110 while the rotary shaft 100 is inserted, And a second support hub coupling step of coupling the second support hub (120) to the rotation shaft (100) in a detachable manner to fix the second support hub (120) to the rotation shaft (100).
19. The method of claim 18,

In the rotating shaft inserting step,

The outer circumferential surface of the cylinder in which the at least one permanent magnet 320 is formed between one side of the rotor 300 and the first support hub 110 is formed in the longitudinal direction of the rotor 100, And a cushioning member 341 which is elastically deformable in the longitudinal direction of the rotary shaft 100 is provided,

The second support hub coupling step includes:

The outer circumferential surface of the cylinder in which the at least one permanent magnet 320 is formed between the other side of the rotor 300 and the second support hub 120 is formed in the longitudinal direction of the rotor 100, And a cushioning member (341) extending from the other end of the rotating shaft (100) and capable of being elastically deformed in the longitudinal direction of the rotating shaft (100).
19. The method of claim 18,

Wherein the fixing part (330) is formed by a film member that is installed to surround the at least one permanent magnet (320) at least once.
19. The method of claim 18,

After the second support hub coupling step,

The first and second support hubs 110 and 120 are rotated by rotating the rotor in a state where the rotor 300 is coupled to measure a vibration pattern and to reduce vibration of the rotor, And a balancing step of removing a part of the motor (120) is performed.