CN111373639A - Rotor of electric motor, electric motor having the same, supercharger having the electric motor, and method of assembling the electric motor - Google Patents

Rotor of electric motor, electric motor having the same, supercharger having the electric motor, and method of assembling the electric motor Download PDF

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Publication number
CN111373639A
CN111373639A CN201880074876.7A CN201880074876A CN111373639A CN 111373639 A CN111373639 A CN 111373639A CN 201880074876 A CN201880074876 A CN 201880074876A CN 111373639 A CN111373639 A CN 111373639A
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CN
China
Prior art keywords
rotor
rotating shaft
support hub
electric motor
motor according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201880074876.7A
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Chinese (zh)
Other versions
CN111373639B (en
Inventor
洪到琯
金东俊
金志元
安珉爀
禹炳哲
李正旭
郑然镐
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Korea Electrotechnology Research Institute KERI
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Korea Electrotechnology Research Institute KERI
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Publication of CN111373639A publication Critical patent/CN111373639A/en
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Publication of CN111373639B publication Critical patent/CN111373639B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/22—Optical devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

The present invention relates to a motor, and more particularly, to a motor and a method of assembling the same. The invention discloses a rotor of a motor, comprising: a rotating shaft (100) rotatably provided in the motor housing; a rotor part (300) which is formed in a hollow shape, is inserted into and coupled to the rotating shaft (100), and rotates together with the rotating shaft (100); wherein the rotating shaft (100) comprises: a first support hub (110) protruding in a radial direction on an outer circumferential surface of the rotating shaft (100) to support one side of the rotor portion (300) inserted into and coupled to the rotating shaft (100); and a second support hub (120) detachably coupled to the rotating shaft (100), and configured to be in close contact with the other side of the rotor unit (300) supported by the first support hub (110) on one side thereof, with the rotating shaft (100) inserted therein, so as to fix the rotor unit (300) to the rotating shaft (100).

Description

Rotor of electric motor, electric motor having the same, supercharger having the electric motor, and method of assembling the electric motor
Technical Field
The present invention relates to an electric motor, and more particularly, to a rotor of an electric motor, an electric motor having the rotor, a supercharger having the electric motor, and a method of assembling the electric motor.
Background
The motor is composed of a rotor and a stator, and means a device for generating a rotational force by applying electric power to at least one of the rotor and the stator and changing a magnetic force between the rotor and the stator.
As an example, the motor may include a stator disposed inside the housing to apply power to the plurality of coils to form a magnetic field, and a rotor disposed inside the stator, rotatably disposed in the housing, coupled to the permanent magnet, and rotated by a change in the magnetic field formed by the stator.
On the other hand, a rotor including a permanent magnet includes a cylindrical rotor core and a cylindrical permanent magnet provided on the outer periphery of the rotor core, and the cylindrical permanent magnet is usually press-fitted on the outer periphery of the rotor core after the cylindrical rotor core is press-fitted on the outer periphery of the rotating shaft.
However, in the rotor structure of the conventional motor having the above-described structure, even if the rotor is pressed against the rotary shaft or the like, a slit in the axial direction is generated due to an assembly error, and thus, the self weight of the rotor may be unbalanced in the axial direction.
In particular, when the rotor is unbalanced by its own weight, there is a problem that motor vibration occurs.
Disclosure of Invention
(problem to be solved)
In order to solve the above-described object, an object of the present invention is to provide a rotor of an electric motor, an electric motor having the same, a supercharger having the electric motor, and a method of assembling the electric motor, in which a slit is prevented from being formed in the rotor coupled to a rotating shaft and the assembly of the electric motor is facilitated.
(means for solving the problems)
The present invention is made to solve the above-described problems, and discloses a rotor of an electric motor, including: a rotating shaft 100 rotatably provided in the motor housing; a rotor part 300 formed in a hollow shape, inserted into and coupled to the rotary shaft 100, and rotated together with the rotary shaft 100; wherein the rotating shaft 100 includes: a first support hub 110 protruding in a radial direction on an outer circumferential surface of the rotary shaft 100 to support one side of the rotor part 300 inserted into and coupled to the rotary shaft 100; and a second support hub 120 detachably coupled to the rotary shaft 100, and configured to fix the rotor unit 300 to the rotary shaft 100 by closely contacting the other side of the rotor unit 300, which is supported by the first support hub 110, to the first support hub 110 side in a state where the rotary shaft 100 is inserted.
The rotor portion 300 may include: a rotor core 310 inserted to an outer peripheral side of the rotating shaft 100; one or more permanent magnets 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 one or more permanent magnets 320 may have a circular shape in a vertical cross section perpendicular to the longitudinal direction of the rotating shaft 100.
The one or more permanent magnets 320 may have a pair of semicircular shapes divided into two parts from the center of the rotation shaft 100 with reference to a longitudinal section perpendicular to the longitudinal direction of the rotation shaft 100.
The present invention may further include a pair of buffer members 341, the pair of buffer members 341 being respectively disposed between one side of the rotor portion 300 and the first support hub 110 and between the other side of the rotor portion 300 and the second support hub 120, extending from both ends of the rotor portion 300 in the longitudinal direction of the rotary shaft 100 to form a cylindrical outer circumferential surface of the one or more permanent magnets 320, and being elastically deformable in the longitudinal direction of the rotary shaft 100.
The pair of buffer members 341 may be stepped to prevent the fixing part 330 from moving in the longitudinal direction of the rotary shaft 100, wherein the fixing part 330 is provided on the outer circumferential surface of the cylinder shape in which the one or more permanent magnets 320 are formed.
The pair of buffer members 341 may have a material of engineering plastic.
The first support hub 110 is screwed to an external thread portion 132 formed on the outer circumferential surface of the rotary shaft 100, and can support the other side of the rotor portion 300 pressed by the second support hub 120.
The fixing part 330 may be a thin film member wound around the outer circumferential surface of the one or more permanent magnets 320 at least once.
The thin film component may include a carbon sheet.
The rotary shaft 100 can rotate the motor housing by providing bearings on both sides around the rotor 300.
The outer diameter of the portion of the rotating shaft 100 where the bearing is formed may be smaller than the outer diameter of the portion where the rotating shaft 300 is disposed.
The rotary shaft 100 is provided at one end with an encoder 200 for controlling the rotation of the motor, and the other end may constitute a driving shaft.
The second support hub 120 may be formed of a nut member screw-coupled with an external thread portion 131 formed at the rotation shaft 100.
The first support hub 110 and the second support hub 120 may be partially removed by a machining mechanism to reduce vibration generated when the rotor portion 300 is rotated in a state of being coupled thereto.
The present invention also discloses a motor, comprising: a motor case 20; a stator 26 provided on an inner circumferential surface of the motor case 20; the rotor 10 is provided as the rotor 10 rotatably provided in the motor case 20 inside the stator 26, and has the above-described structure.
The invention also discloses an electric supercharger, comprising: an impeller housing 30 forming an air passage that sucks air in an axial direction and discharges air in a radial direction; an impeller 31 which rotates in the impeller housing 30 and discharges high-pressure air through the air passage formed in the impeller housing 30; and a motor that is coupled to the drive shaft and rotationally drives the impeller 31, and has the above-described structure.
The present invention discloses an assembling method of a motor, as a method for assembling a motor including a motor rotor having the above-described structure, including: a rotating shaft inserting step of inserting and coupling the rotating shaft 100 into the hollow of the rotor portion 300 such that the rotor portion 300 is supported by a first support hub 110 radially protruding from the outer circumferential surface of the rotating shaft 100; and a second support hub coupling step of detachably coupling the second support hub 120 to the rotary shaft 100, and closely contacting the other side of the rotor portion 300, which is supported by the first support hub 110, to the first support hub 110 side in a state where the rotary shaft 100 is inserted.
A buffer member 341 may be provided between one side of the rotor portion 300 and the first support hub 110, the buffer member 341 extending from one end of the rotor portion 300 in a longitudinal direction of the rotary shaft 100 to form a cylinder-shaped outer circumferential surface of the one or more permanent magnets 320, and being elastically deformable in the longitudinal direction of the rotary shaft 100; in the second support boss coupling step, a buffer member 341 may be provided between the other side of the rotor portion 300 and the second support boss 120, and the buffer member 341 may extend from the other end of the rotor portion 300 in the longitudinal direction of the rotary shaft 100 to form a cylinder-shaped outer circumferential surface of the one or more permanent magnets 320 and may be elastically deformed in the longitudinal direction of the rotary shaft 100.
The fixing part 330 may be formed of a thin film member wound around the outer circumferential surface of the one or more permanent magnets 320 one or more times.
A balancing step of measuring a vibration mode by rotating the rotor in a state where the rotor part 300 is coupled thereto, and removing a portion of the first support hub 110 and the second support hub 120 using a machining mechanism to reduce vibration of the rotor may be performed after the second support hub coupling step.
(Effect of the invention)
The rotor of the motor, the motor with the rotor, the supercharger with the motor and the assembling method of the motor have the following advantages: the rotor portion is fixed by the first support hub and the second support hub, and the rotor portion is prevented from being slit and is easily assembled.
Further, the rotor of the electric motor, the electric motor having the same, the supercharger having the electric motor, and the method of assembling the electric motor according to the present invention have the following advantages: in order to compensate for machining errors, assembly errors, and the like between a rotor portion having a metal material and first and second support hubs supporting both sides of the rotor portion, respectively, elastically deformable engineering plastics such as PEEK are interposed, and a more precise motor can be manufactured.
The rotor of the electric motor, the electric motor having the rotor, the supercharger having the electric motor, and the method of assembling the electric motor according to the present invention have the following advantages: the first and second support hubs are firmly fixed to the rotor, and the permanent magnets are further fixed to the rotor by CFRP, so that the rotor can be balanced easily, and the rotor can be rotated at high speed in a supercharger or the like which is required to rotate at high speed with a strong structure and an optimum balance, and can be miniaturized.
Drawings
Fig. 1 is a perspective view of a motor according to a first embodiment of the present invention.
Fig. 2 is a cut perspective view of a portion of the motor of fig. 1.
Fig. 3 is a longitudinal sectional view of fig. 1.
Fig. 4 is an enlarged view of the rotor portion of fig. 3.
FIG. 5 is a cross-sectional view taken along line IV-IV of FIG. 3.
Fig. 6 is an exploded view showing an assembled structure of the motor of fig. 1.
Fig. 7 is a cut perspective view of a part of a motor of a second embodiment of the present invention.
Fig. 8 is a longitudinal sectional view of fig. 7.
Fig. 9 shows an exploded view of an assembled structure of the motor of fig. 7.
Fig. 10 is a cross-sectional view showing a schematic example of a supercharger to which the electric motor of fig. 1 is applied.
Detailed Description
Hereinafter, a rotor of an electric motor, an electric motor having the rotor, a supercharger having the electric motor, and a method of assembling the electric motor according to the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 10, the electric motor of the present invention includes, as an electric motor having a rotor 10 provided with a permanent magnet 320: a motor case 20; a stator 26 provided on the inner peripheral surface of the motor case 20; a rotor 10 rotatably provided in the motor case 20 and provided with a permanent magnet 320.
The motor housing 20 may have various structures according to the use of the motor as a structure for installing the stator 26 and the rotor 10.
As an example, the motor housing 20 may combine a hollow cylinder 21 opened at both sides and cover members 22, 23, and the cover members 22, 23 rotatably support the rotation shaft 100 of the rotor 10 at both ends of the hollow cylinder 21.
On the other hand, one side of the motor housing 20 is protruded to the outside to allow the rotation shaft 100, which is rotationally driven, to be used as a driving shaft according to the use purpose of the motor, and the other side may be combined with a control housing 24 provided with a control portion 25, the control portion 25 being for controlling the rotational driving of the rotation shaft 100.
Then, an impeller or the like may be coupled to the driving shaft portion in the rotating shaft 100 according to the use of the motor.
The stator 26 may be configured to rotate the rotor 10 by a magnetic force acting on the rotor 10 having the permanent magnets 320, and may include a plurality of coil windings 27.
The rotor 10 may have various structures as a structure rotatably provided in the motor housing 20 and having the permanent magnet 320.
In particular, the rotor 10 is a structure of the present invention, and as shown in fig. 1 to 6, the rotor 10 of the motor of the present invention includes: a rotary shaft 100 rotatably provided in the motor housing 20; a hollow rotor part 300 inserted into and coupled to the rotation shaft 100 and rotating together with the rotation shaft 100.
The rotary shaft 100 may have various structures as a structure rotatably provided in a motor housing and generating a rotational driving force.
As an example, it is preferable that the rotation shaft 100 includes: a first support hub 110 radially extending from an outer circumferential surface of the rotary shaft 100 to support a side of the rotor 300 inserted into the rotary shaft 100; the second support hub 120 is detachably coupled to the rotary shaft 100, and in a state where the rotary shaft 100 is inserted, the second support hub is brought into close contact with the other side of the rotor portion 300, which is supported by the first support hub 110 on one side, toward the first support hub 110, thereby fixing the rotor portion 300 to the rotary shaft 100.
The first support hub 110 may have various configurations as a configuration for supporting the rotor portion 300 inserted into the rotary shaft 100 in a radial direction from the outer circumferential surface of the rotary shaft 100 and a configuration for fixing the rotor portion 300 together with the second support hub 120 described later.
As an example, as shown in fig. 2, 3 and 6, the first support hub 110 may be integrally formed to protrude from an outer circumferential surface of the rotating shaft 100 in a radial direction.
In particular, the first support hub 110 is preferably formed in a disc shape having an outer diameter larger than that of the rotary shaft 100 when viewed in the direction of the rotary shaft 100, as a structure integrally protruding in the radial direction from the outer peripheral surface of the rotary shaft 100 to support the rotor portion 300 in the axial direction.
Then, the first support hub 110 may be partially removed by a machining device such as a milling machine to maintain axial balance, that is, balance of rotational inertia after the rotor portion 300 is coupled.
On the other hand, as shown in fig. 7 to 9, the first support hub 110 may be detachably integrated with the rotary shaft 100, similar to a second support hub 120 described later, instead of being protruded from the outer circumferential surface of the rotary shaft 100.
Then, the structure in which the first support hub 110 is detachable with respect to the rotation shaft 100 may be coupled to the rotation shaft 100 by screw coupling, or the like, in various ways, similar to the second support hub 120 described later.
That is, the first support hub 110 is configured such that the female screw 112 is formed on the inner peripheral surface thereof and is screwed with the male screw 132 formed on the outer peripheral surface of the rotary shaft 100, and can support the other side of the rotor 300 pressed by the second support hub 120.
In particular, it is preferable that the first support hub 110 is formed to be asymmetrical with the second support hub 120 in a state that the first support hub 110 is detachably provided to the rotary shaft 100.
On the other hand, as the material of the rotating shaft 100, a inconel material having excellent heat resistance or the like can be used.
The remaining structure other than the rotary shaft 100, the first support hub 110, and the second support hub 120 may be a shaft rotatably provided in the motor housing, and may have various structures, such as a coupling structure with the rotor portion 300 and the bearing, and a coupling structure of a rotation driving object rotationally driven by rotation of the rotor.
The second support hub 120 may have various configurations as a configuration detachably coupled to the rotary shaft 100 so as to be closely attached to the other side of the rotor portion 300 supported by the first support hub 110 on one side toward the first support hub 110 in a state where the rotary shaft 100 is inserted.
As an example, the second support hub 100 and the rotation shaft 100 may be coupled by various means, such as a screw coupling, etc.
That is, the second support hub 120 may be formed of a nut member having an internal thread portion 122 formed on an inner circumferential surface thereof to be screwed to an external thread portion 131 formed on the rotary shaft 100.
On the other hand, the first support hub 110 and the second support hub 120 may be partially removed by a machining mechanism to reduce vibration generated when the rotor portion 300 is coupled to rotate.
That is, similar to the first support hub 110 described above, the second support hub 120 may be partially removed by a machining device such as a milling machine to maintain axial balance, that is, balance of rotational inertia after the rotor portion 300 is coupled.
Then, a metal material such as brass may be used for the material of the second support hub 120.
On the other hand, it is preferable that a pair of buffer members 341 are further provided between one side of the rotor portion 300 and the first support hub 110 and between the other side of the rotor portion 300 and the second support hub 120, respectively, and the pair of buffer members 341 are capable of being elastically deformed in the longitudinal direction of the rotary shaft 100 while extending the outer circumferential surface of the cylinder shape in which the one or more permanent magnets 320 are formed in the longitudinal direction of the rotary shaft 100 from both ends of the rotor portion 300.
The pair of buffer members 341 have various configurations, and are disposed between one side of the rotor portion 300 and the first support hub 110 and between the other side of the rotor portion 300 and the second support hub 120, respectively, so as to extend in the longitudinal direction of the rotary shaft 100 from both ends of the rotor portion 300 to form a cylindrical outer circumferential surface of one or more permanent magnets 320, and to be elastically deformable in the longitudinal direction of the rotary shaft 100.
As an example, the pair of buffer members 341 may have various structures such that the pair of buffer members 341 are respectively positioned between one side of the rotor portion 300 and the first support hub 110 and between the other side of the rotor portion 300 and the second support hub 120, and the pair of buffer members 341 form a circular ring or the like inserted into the rotating shaft 100.
On the other hand, the pair of buffer members 341 are preferably formed in a stepped manner so as to prevent the fixing portion 330 provided on the outer circumferential surface of the cylinder shape on which the one or more permanent magnets 320 are formed from moving in the longitudinal direction of the rotary shaft 100.
Specifically, when the fixing portion 330 described later is provided on the outer peripheral surface of the permanent magnet 320, a gap can be formed in the axial direction, and in order to prevent this, the first step 342 is formed as shown in fig. 2 and 3.
In this case, the height of the first step 342 is preferably set to a height corresponding to the thickness of the fixing portion 330 so as to form a gentle surface together with the outer circumferential surface of the fixing portion 330, which will be described later.
Preferably, the pair of buffer members 341 have an outer diameter larger than the outer diameters of the first support hub 110 and the second support hub 120.
Preferably, the pair of buffer members 341 form a second step 343 at a position corresponding to the first support hub 110 and the second support hub 120, and further recess the first support hub 110 and the second support hub 120 in the axial direction, respectively.
By forming the second step 343 as described above, the first support hub 110 and the second support hub 120 have a sufficient thickness in the axial direction, and the total length of the rotor portion 300 in the direction of the rotation shaft 100 can be minimized.
Then, it is preferable that the pair of buffer parts 341 have a material of engineering plastic elastically deformable, such as PEEK or the like.
On the other hand, it is preferable that the rotary shaft 100 is provided with bearings (not shown) on both sides centering on the rotor portion 300 so as to be rotatable with respect to the motor housing.
Then, it is preferable that the outer diameter of the portion 130 of the rotating shaft 100 where the bearing is provided is smaller than the outer diameter of the portion where the rotating shaft 300 is provided.
In addition, the rotary shaft 100 may be provided at one end with an encoder 200 for controlling the rotation of the motor, and the other end may be constituted by a driving shaft.
At this time, the rotary shaft 100 may form a recess 150 in an axial direction to set the encoder 200.
Here, for convenience, the positions of the drive shaft and the encoder 200 may be interchanged at both ends of the rotary shaft 100.
The rotor portion 300 may have various structures as a hollow type structure inserted into and coupled to the rotation shaft 100 and rotated together with the rotation shaft 100.
As an example, the rotor portion 300 may include: a rotor core 310 inserted to the outer circumferential side of the rotating shaft 100; one or more permanent magnets 320 coupled to the outer circumferential surface of rotor core 310; a fixing portion 330 for fixing the permanent magnet 320 coupled to the rotor core 310 to the rotating shaft 100.
The rotor core 310 is inserted to the outer peripheral side of the rotating shaft 100, and a plurality of cores are stacked to form a rotor core of the motor.
Here, the rotor core 310 has a through hole 311 formed in the center thereof so as to be press-fitted into the rotary shaft 100.
The permanent magnet 320 may have various structures as a structure coupled to the outer circumferential surface of the rotor core 310.
As an example, the permanent magnet 320 may have a circular shape in a longitudinal section perpendicular to the length direction of the rotating shaft 100.
The one or more permanent magnets 320 may have a pair of semicircular shapes divided into two parts from the center of the rotation shaft 100 with respect to a longitudinal section perpendicular to the longitudinal direction of the rotation shaft 100.
As described above, if the one or more permanent magnets 320 have a pair of semicircular shapes divided into two parts from the center of the rotation shaft 100 with respect to the longitudinal section perpendicular to the longitudinal direction of the rotation shaft 100, there is an advantage in that permanent magnets having relatively weak rigidity can be easily coupled.
Specifically, although the conventional permanent magnet is formed in a shape similar to the rotor core 310 and pressed into the outer peripheral surface of the rotor core 310, and thus has a problem such as damage due to rigidity, if the permanent magnet is formed in a pair of semicircular shapes divided into two from the center of the rotary shaft 100, there is an advantage in that the permanent magnet having relatively weak rigidity can be easily coupled.
The fixing portion 330 may have various structures such as epoxy, film, etc. as a structure for fixing the permanent magnet 320 coupled to the rotor core 310 to the rotating shaft 100.
As an example, the fixing part 330 may be formed of a thin film member provided to wind the outer circumferential surface of the one or more permanent magnets 320 one or more times.
More specifically, the thin film component may include a carbon sheet.
On the other hand, the motor having the above-described structure, particularly the rotating shaft and the rotor, can be assembled and completed by the following method.
First, the rotary shaft 100 is inserted into the rotor core 310. Here, in the case of interposing the buffer member 341, in order that the buffer member 341 may be positioned between the first support hub 110 and the rotor core 310 before being inserted into the rotor core 310, the buffer member 341 is inserted into the rotary shaft 100 in preference to the rotor core 310.
After the rotor core 310 is inserted, the rotor core 210 is moved toward the first support hub 110 side by screwing the second support hub 120, thereby fixing the rotor core 210.
At this time, in the case where the buffer member 341 is interposed, the buffer member 341 is preferably inserted into the rotary shaft 100 through the second support hub 120 so that the buffer member 341 is positioned between the rotor core 310 and the second support hub 120.
On the other hand, when the permanent magnets 320 are provided in a pair in a state of being coupled to the rotor core 310 or in a semicircular shape in a vertical cross section according to the structure thereof, the permanent magnets are coupled to the rotor core 310 in a direction perpendicular to the rotation axis 100 (i.e., in a radial direction).
Here, regarding the order of arrangement of the permanent magnets 320, in the case where the permanent magnets are integrated, the permanent magnets 320 are first arranged before the second support hub 120 is coupled.
When the permanent magnets 320 are formed in a pair by forming a semicircle in the vertical cross section, they are preferably provided on the outer peripheral surface of the rotor core 310 after first joining the second support hub 120.
On the other hand, a fixing portion 330 is provided after the permanent magnet 320 is provided to protect the permanent magnet 320.
Specifically, the fixing portion 330 may be wound around the outer circumferential surface of the permanent magnet 320 as a thin film member such as CFRP (carbon fiber reinforced plastic).
More specifically, the fixing portion 330 may be formed by winding a thin film of CFRP material around the outer circumferential surface of the permanent magnet 320.
The fixing part 330 may be formed by winding a carbon sheet around the outer circumferential surface of the permanent magnet 320 and impregnating and curing a resin.
In this case, the fixing portion 330 is preferably provided on both the outer peripheral surface of the permanent magnet 320 and the outer peripheral surface of the cushioning member 341.
Then, in order to prevent slipping in the axial direction after the fixing portion 330 is provided, the fixing portion 330 may be wound to the inside of the first step 342 formed at the buffer member 341.
On the other hand, the motor including the motor rotor having the above-described structure can be assembled by a motor assembling method according to the present invention, as shown in fig. 6 and 9, which includes: a rotating shaft inserting step of inserting the rotating shaft 100 into a hollow of the rotor portion 300 such that the rotor portion 300 side is supported by a first support hub 110 protruding in a radial direction from an outer circumferential surface of the rotating shaft 100; and a second support hub coupling step of detachably coupling the second support hub 120 to the rotary shaft 100, and fixing the rotor portion 300 to the rotary shaft 100 by closely contacting the other side of the rotor portion 300, which is supported by the first support hub 110 on one side, to the first support hub 110 side in a state where the rotary shaft 100 is inserted.
The rotating shaft inserting step may be performed by various methods as a step of inserting the rotating shaft 100 in the hollow of the rotor portion 300 such that the rotor portion 300 side is supported by the first support hub 110 protruding in a radial direction from the outer circumferential surface of the rotating shaft 100.
Here, in the case where the first support hub 110 is detachably coupled to the rotary shaft 100 as a separate member from the rotary shaft 100, it may be coupled to the rotary shaft 100 before or after the rotor portion 300 is coupled.
The second support hub coupling step may be performed by various methods as a step of detachably coupling the second support hub 120 to the rotary shaft 100, and fixing the rotor portion 300 to the rotary shaft 100 by closely contacting the other side of the rotor portion 300, which is supported by the first support hub 110 on one side, to the first support hub 110 side in a state where the rotary shaft 100 is inserted.
Here, in the case where the first support hub 110 is detachably coupled to the rotary shaft 100 as a separate member from the rotary shaft 100, the rotor portion 300 positioned between the first support hub 110 and the second support hub 120 may be fixed together with the second support hub 120, or the rotor portion 300 may be fixed by screwing the remaining one after the first support hub 110 and the second support hub 120 are first set to the reference position.
The order of coupling the first support hub 110 and the second support hub 120 to the rotary shaft 100 is selected for convenience, and it is needless to say that the rotor portion 300 may be inserted and the first support hub 110 may be coupled after the second support hub 120 is coupled to the rotary shaft 100.
On the other hand, in the rotating shaft inserting step, a buffer member 341 may be provided between one side of the rotor portion 300 and the first support hub 110, and the buffer member 341 may be elastically deformed in the longitudinal direction of the rotating shaft 100, and may extend from one end of the rotor portion 300 in the longitudinal direction of the rotating shaft 100 to form a cylinder-shaped outer circumferential surface of the one or more permanent magnets 320.
In the second support hub coupling step, a buffer member 341 may be provided between the other side of the rotor portion 300 and the second support hub 120, and the buffer member 341 may be elastically deformed in the longitudinal direction of the rotary shaft 100 and may extend from the other end of the rotor portion 300 in the longitudinal direction of the rotary shaft 100 to form a cylindrical outer circumferential surface on which the one or more permanent magnets 320 are formed.
On the other hand, in the structure of the rotor portion 100, the fixing portion 330 for fixing the permanent magnet 320 may be formed by a thin film member provided to wind the outer circumferential surface of one or more permanent magnets 320 one or more times.
Then, after the second support hub coupling step, the rotor in the state of being coupled to the rotor part 300 is rotated to measure a vibration mode, and a balancing step of removing a portion of the first support hub 110 and the second support hub 120 by a machining mechanism may be performed in order to reduce the vibration of the rotor.
On the other hand, the motor of the present invention having the above-described structure can be miniaturized, has a robust structure suitable for high-speed rotation, and is suitable for use in a high-speed rotation environment.
The electric motor of the present invention may be adapted to rotationally drive the impeller 31 of the supercharger to apply pressure to intake air in the engine by high-speed rotational drive of the electric motor.
Specifically, as shown in fig. 10, an electric supercharger to which the electric motor of the present invention is applied includes: an impeller housing 30 forming an air passage that sucks air in an axial direction and discharges air in a radial direction; an impeller 31 which rotates in the impeller housing 30 and discharges high-pressure air through an air passage formed in the impeller housing 30; the motor has the above-described configuration, and the impeller 31 is coupled to the drive shaft to rotationally drive the impeller 31.
The impeller housing 30 may have various structures as a structure forming an air passage for sucking air in an axial direction and discharging air in a radial direction.
As an example, the impeller housing 30 has an axial intake port and an exhaust port formed in a direction in contact with the circumferential direction of the impeller 31, and any configuration may be used as long as it has the intake port and the exhaust port and forms an air passage to have a compression ratio required as a supercharger.
The impeller 31 may have various structures according to a compression ratio required as a supercharger as a structure coupled to a drive shaft (i.e., the rotary shaft 100) of the motor as described above.
Since the above description is only a part of the preferred embodiments that can be realized by the present invention, it is well known that the scope of the present invention should not be construed as being limited to the above-described embodiments, but the technical ideas of the present invention and the fundamental technical ideas thereof described above are all included in the scope of the present invention.

Claims (21)

1. A rotor of an electric motor comprising:
a rotating shaft (100) rotatably provided in the motor housing;
a rotor part (300) which is formed in a hollow shape, is inserted into and coupled to the rotating shaft (100), and rotates together with the rotating shaft (100);
wherein the rotating shaft (100) comprises:
a first support hub (110) protruding in a radial direction on an outer circumferential surface of the rotating shaft (100) to support one side of the rotor portion (300) inserted into and coupled to the rotating shaft (100);
and a second support hub (120) detachably coupled to the rotating shaft (100), and configured to be in close contact with the other side of the rotor unit (300) supported by the first support hub (110) on one side thereof, with the rotating shaft (100) inserted therein, so as to fix the rotor unit (300) to the rotating shaft (100).
2. The rotor of an electric motor according to claim 1,
the rotor portion (300) includes:
a rotor core (310) inserted to the outer peripheral side of the rotating shaft (100);
one or more permanent magnets (320) coupled to an outer peripheral surface of the rotor core (310);
and a fixing unit (330) that fixes the permanent magnet (320) coupled to the rotor core (310) to the rotating shaft (100).
3. The rotor of an electric motor according to claim 2,
the shape of a longitudinal section of the one or more permanent magnets (320) perpendicular to the longitudinal direction of the rotating shaft (100) is a circular shape.
4. The rotor of an electric motor according to claim 3,
the one or more permanent magnets (320) have a pair of semicircular shapes that are divided into two parts from the center of the rotating shaft (100) with respect to a longitudinal section perpendicular to the longitudinal direction of the rotating shaft (100).
5. The rotor of an electric motor according to claim 3, further comprising:
and a pair of buffer members (341) that are provided between one side of the rotor unit (300) and the first support hub (110) and between the other side of the rotor unit (300) and the second support hub (120), that extend from both ends of the rotor unit (300) in the longitudinal direction of the rotating shaft (100) to form a cylinder-shaped outer circumferential surface of the one or more permanent magnets (320), and that are elastically deformable in the longitudinal direction of the rotating shaft (100).
6. The rotor of an electric motor according to claim 5,
the pair of buffer members (341) form steps for preventing a fixed part (330) from moving in the longitudinal direction of the rotating shaft (100), wherein the fixed part (330) is provided on the outer circumferential surface of the cylinder shape on which the one or more permanent magnets (320) are formed.
7. The rotor of an electric motor according to claim 5,
the pair of cushioning members (341) is made of an engineering plastic material.
8. The rotor of an electric motor according to claim 1,
the first support hub (110) is screwed to an external thread portion (132) formed on the outer peripheral surface of the rotating shaft (100) to support the other side of the rotor portion (300) pressed by the second support hub (120).
9. The rotor of an electric motor according to any one of claims 2 to 8,
the fixing part (330) is a thin film member that is wound around the outer peripheral surface of the one or more permanent magnets (320) at least once.
10. The rotor of an electric motor according to claim 9,
the thin film component includes a carbon sheet.
11. The rotor of an electric motor according to any one of claims 1 to 8,
the rotating shaft (100) rotates a motor housing by providing bearings on both sides of the rotor unit (300).
12. The rotor of an electric motor according to claim 11,
the rotating shaft (100) is formed such that the outer diameter of a portion where the bearing is provided is smaller than the outer diameter of a portion where the rotating shaft portion (300) is provided.
13. The rotor of an electric motor according to any one of claims 1 to 8,
the rotary shaft (100) is provided at one end with an encoder (200) for controlling the rotation of the motor, and the other end constitutes a drive shaft.
14. The rotor of an electric motor according to any one of claims 1 to 8,
the second support hub (120) is formed of a nut member that is screwed to an external thread portion (131) formed on the rotating shaft (100).
15. The rotor of an electric motor according to any one of claims 1 to 8,
the first support hub (110) and the second support hub (120) are partially removed by a machining mechanism to reduce vibration generated when the rotor portion (300) is rotated in a state of being coupled thereto.
16. An electric motor, comprising:
a motor housing (20);
a stator (26) provided on an inner peripheral surface of the motor housing (20);
a rotor (10) provided rotatably in the motor case (20) inside the stator (26) and having the structure of any one of claims 1 to 8.
17. An electric supercharger comprising:
an impeller housing (30) forming an air passage that sucks air in an axial direction and discharges air in a radial direction;
an impeller (31) that rotates in the impeller housing (30) and discharges air at a high pressure through the air passage formed in the impeller housing (30);
a motor, wherein the impeller (31) is coupled to a drive shaft to rotationally drive the impeller (31), and the motor has the structure of claim 16.
18. An assembling method of an electric motor including a motor rotor having the structure of any one of claims 1 to 5, as a method for assembling an electric motor, comprising:
a rotating shaft insertion step of inserting and coupling the rotating shaft (100) into the hollow of the rotor unit (300) such that the rotor unit (300) is supported by a first support hub (110) that protrudes in the radial direction from the outer peripheral surface of the rotating shaft (100);
and a second support hub coupling step of detachably coupling the second support hub (120) to the rotary shaft (100) and further closely attaching the second support hub to the first support hub (110) side while inserting the rotary shaft (100), and the other side of the rotor section (300) supported by the first support hub (110).
19. The method of assembling an electric motor according to claim 18,
the rotating shaft inserting step of inserting the rotating shaft,
a buffer member (341) is provided between one side of the rotor portion (300) and the first support hub (110), the buffer member (341) extending from one end of the rotor portion (300) in the longitudinal direction of the rotating shaft (100) to form a cylinder-shaped outer peripheral surface of the one or more permanent magnets (320), and being elastically deformable in the longitudinal direction of the rotating shaft (100);
the second support hub coupling step of coupling the second support hub,
a buffer member (341) is provided between the other side of the rotor portion (300) and the second support hub (120), and the buffer member (341) extends from the other end of the rotor portion (300) in the longitudinal direction of the rotating shaft (100) to form a cylinder-shaped outer peripheral surface of the one or more permanent magnets (320) and is elastically deformable in the longitudinal direction of the rotating shaft (100).
20. The method of assembling an electric motor according to claim 18,
the fixing part (330) is formed by a thin film member which is wound more than once around the outer peripheral surface of the one or more permanent magnets (320).
21. The method of assembling an electric motor according to claim 18,
a balancing step is carried out after said second support hub coupling step,
the balancing step is to rotate the rotor in a state of being coupled to the rotor portion (300) to measure a vibration mode, and remove a part of the first support hub (110) and the second support hub (120) by using a machining mechanism to reduce the vibration of the rotor.
CN201880074876.7A 2017-11-20 2018-11-20 Rotor of motor, motor with rotor, supercharger with motor and assembling method of motor Active CN111373639B (en)

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KR20170154698 2017-11-20
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PCT/KR2018/014265 WO2019098809A1 (en) 2017-11-20 2018-11-20 Rotor for electric motor, electric motor comprising same, supercharger comprising same, and assembly method for electric motor

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