KR20070099891A - Motor of electric power steering - Google Patents

Motor of electric power steering Download PDF

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Publication number
KR20070099891A
KR20070099891A KR1020060031231A KR20060031231A KR20070099891A KR 20070099891 A KR20070099891 A KR 20070099891A KR 1020060031231 A KR1020060031231 A KR 1020060031231A KR 20060031231 A KR20060031231 A KR 20060031231A KR 20070099891 A KR20070099891 A KR 20070099891A
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KR
South Korea
Prior art keywords
housing
magnet
bracket
fixed
core
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KR1020060031231A
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Korean (ko)
Inventor
이창환
Original Assignee
엘지이노텍 주식회사
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Priority to KR1020060031231A priority Critical patent/KR20070099891A/en
Publication of KR20070099891A publication Critical patent/KR20070099891A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D5/00—Power-assisted or power-driven steering
    • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
    • B62D5/0409—Electric motor acting on the steering column
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Steering Mechanism (AREA)

Abstract

An electric power steering motor is provided to prevent the deterioration of a coil and the reduction of magnetization of a magnet by radiating a heat from the inside of a housing. An electric power steering motor includes a housing(110), a rotation axis(130), a core(141), a first magnet(145), a coil(150), a bracket(120), a back-yoke(161), a second magnet(165), and a heat radiation unit. A top plane of the housing(110) is opened. The rotation axis(130) is rotatably installed on the inside of the housing(110), and is connected to a steering axis. The core(141) is fixed on an outer plane of the rotation axis(130). The first magnet(145) is fixed on an outer plane of the core(141). The first magnet(145) is fixed on an outer plane of the core(141). The coil(150) is fixed on the housing(110) to wrap the first magnet(145). The bracket(120) is coupled to the top plane of the housing(110). The back-yoke(161) is fixed on the rotation axis(130) of the inside of the bracket (120), and rotates in the same direction with the rotation axis (130). The second magnet(165) is coupled to a bottom plane of the back-yoke(161), and transmits a rotation angle of the rotation axis to an ECU(Electronic Control Unit) of a vehicle. The heat radiation unit is formed on the bracket(120) and the- back yoke(161), and radiates the heat form the inside of the housing(110).

Description

전동 파워 스티어링용 모터 {MOTOR OF ELECTRIC POWER STEERING}Motor for Electric Power Steering {MOTOR OF ELECTRIC POWER STEERING}

도 1은 종래의 전동 파워 스티어링용 모터의 일부 절개 사시도.1 is a partial cutaway perspective view of a conventional electric power steering motor.

도 2는 본 발명의 일 실시예에 따른 전동 파워 스티어링용 모터의 일부 절개 사시도.Figure 2 is a partially cutaway perspective view of the motor for electric power steering according to an embodiment of the present invention.

도 3은 도 2에 도시된 백요크와 브라켓의 분해 사시도.Figure 3 is an exploded perspective view of the back yoke and the bracket shown in FIG.

*도면의 주요부분에 대한 부호의 설명** Description of the symbols for the main parts of the drawings *

110 : 하우징 120 : 브라켓110 housing 120 bracket

130 : 회전축 141 : 코어130: rotation axis 141: core

145 : 제 1 마그네트 150 : 코일145: first magnet 150: coil

161 : 백요크 165 : 제 2 마그네트161: Back York 165: the second magnet

본 발명은 전동 파워 스티어링(Electric Power Steering ; 이하, 'EPS'라 함)용 모터에 관한 것이다.The present invention relates to a motor for electric power steering (hereinafter referred to as "EPS").

차량에는 각종 입력센서에서 검출되는 전기적 신호를 입력받아, 출력측의 각종 액츄에이터를 구동하기 위한 디지털 제어신호를 출력하는 ECU(Electric Control Unit)가 마련된다. 그리고, EPS용 모터는 상기 ECU로부터 신호를 전달 받아 운전자가 가볍고 신속하게 조향 조작을 하도록 운전자의 핸들 조작력을 보조해준다.The vehicle is provided with an ECU (Electric Control Unit) for receiving electrical signals detected by various input sensors and outputting digital control signals for driving various actuators on the output side. In addition, the EPS motor receives a signal from the ECU and assists the driver's steering wheel manipulation force so that the driver can steer lightly and quickly.

종래의 EPS용 모터를 도 1을 참조하여 설명한다. 도 1은 종래의 전동 파워 스티어링용 모터의 일부 절개 사시도이다.A conventional EPS motor will be described with reference to FIG. 1. 1 is a partially cutaway perspective view of a conventional electric power steering motor.

도시된 바와 같이, 상면이 개방된 하우징(11)과 하우징의 상면에 결합된 브라켓(15)이 마련된다. 하우징(11)의 저면 및 브라켓(15)에는 베어링(12,16)이 각각 고정되고, 베어링(12,16)에는 회전축(21)이 지지되어 회전가능하게 설치된다. 회전축(21)의 상단부측은 브라켓(15)의 상측으로 노출되어 조향축(미도시)과 결합된다.As shown, a housing 11 having an open top surface and a bracket 15 coupled to the top surface of the housing are provided. Bearings 12 and 16 are fixed to the bottom of the housing 11 and the bracket 15, respectively, and the rotating shafts 21 are supported to the bearings 12 and 16 so as to be rotatable. The upper end side of the rotating shaft 21 is exposed to the upper side of the bracket 15 is coupled to the steering shaft (not shown).

회전축(21)의 외주면에는 코어(23)가 결합되고, 코어(23)의 외주면에는 마그네트(25)가 고정되며, 하우징(11)의 내주면에는 코일(30)이 고정된다. 그리하여, 코일(30)과 마그네트(25)의 작용에 의하여 회전축(21)이 회전하면서 상기 조향축을 회전시키는 것이다.The core 23 is coupled to the outer circumferential surface of the rotating shaft 21, the magnet 25 is fixed to the outer circumferential surface of the core 23, and the coil 30 is fixed to the inner circumferential surface of the housing 11. Thus, the steering shaft is rotated while the rotating shaft 21 rotates by the action of the coil 30 and the magnet 25.

브라켓(15) 내부의 회전축(21)의 부위에는 백요크(41)가 고정되고, 백요크(41)의 저면에는 마그네트(43)가 고정된다. 그리고, 마그네트(43)와 소정 거리 이격되어 PCB(미도시)가 브라켓(15)에 고정된다. 상기 PCB에는 센서(미도시)가 설치되는데, 상기 센서는 마그네트(43)를 감지하여 회전축(21)의 회전각도를 측정한다.The back yoke 41 is fixed to the portion of the rotating shaft 21 inside the bracket 15, and the magnet 43 is fixed to the bottom of the back yoke 41. The PCB 43 is fixed to the bracket 15 by being spaced apart from the magnet 43 by a predetermined distance. A sensor (not shown) is installed on the PCB, and the sensor detects the magnet 43 to measure the rotation angle of the rotating shaft 21.

EPS용 모터는 차량에 설치되어 사용되므로, 컴팩트 및 고출력의 특성을 가져야 한다. 그리고, 정지된 차량의 조향시에는 큰 부하가 걸리므로, 코일에 높은 전 류가 인가된다.Since the motor for EPS is installed and used in a vehicle, it should have the characteristics of compact and high power. In addition, since a large load is applied when the vehicle is stopped, a high current is applied to the coil.

그런데, 종래의 EPS용 모터는 코일(30)에서 발생하는 열을 외부로 방출할 수 있는 적절한 수단이 없으므로, 하우징(11) 내부가 온도가 상승한다. 이로인해, 코일(30)이 열화되고 마그네트(25)가 감자되어 출력이 저하되는 단점이 있다.However, since the conventional EPS motor has no suitable means for dissipating heat generated from the coil 30 to the outside, the temperature inside the housing 11 increases. Due to this, there is a disadvantage that the coil 30 is deteriorated and the magnet 25 is demagnetized and the output is lowered.

본 발명은 상기와 같은 종래 기술의 문제점을 해소하기 위하여 안출된 것으로, 본 발명의 목적은 내부 발열에 의한 출력저하의 문제점을 해결 수 있는 EPS용 모터를 제공함에 있다.The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to provide a motor for EPS that can solve the problem of the output reduction by the internal heat.

상기 목적을 달성하기 위한 본 발명에 따른 EPS용 모터는, 상면이 개방된 하우징; 상기 하우징의 내부에 회전가능하게 설치되며 조향축과 연결된 회전축; 상기 회전축의 외주면에 고정된 코어; 상기 코어의 외주면에 고정된 제 1 마그네트; 상기 제 1 마그네트를 감싸는 형태로 상기 하우징에 고정된 코일; 상기 하우징의 상면에 결합된 브라켓; 상기 브라켓 내부의 상기 회전축 부위에 고정되어 상기 회전축과 동일하게 회전하는 백요크; 상기 백요크의 저면에 결합되어 상기 회전축의 회전각도를 차량의 ECU로 전달하는 제 2 마그네트; 상기 브라켓과 상기 백요크에 형성되어 상기 하우징 내부의 열을 외부로 방출시키는 수단을 포함한다.EPS motor according to the present invention for achieving the above object, the upper surface is open housing; A rotating shaft rotatably installed in the housing and connected to a steering shaft; A core fixed to an outer circumferential surface of the rotating shaft; A first magnet fixed to an outer circumferential surface of the core; A coil fixed to the housing in a form surrounding the first magnet; A bracket coupled to an upper surface of the housing; A back yoke fixed to a portion of the rotation shaft inside the bracket and rotating the same as the rotation shaft; A second magnet coupled to a bottom surface of the back yoke to transmit a rotation angle of the rotation shaft to the ECU of the vehicle; And a means formed in the bracket and the back yoke to dissipate heat inside the housing to the outside.

이하, 첨부한 도면을 참조하여 본 발명의 일 실시예에 따른 EPS용 모터를 상세히 설명한다.Hereinafter, an EPS motor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

도 2는 본 발명의 일 실시예에 따른 전동 파워 스티어링용 모터의 일부 절개 사시도이고, 도 3은 도 2에 도시된 백요크와 브라켓의 분해 사시도이다.2 is a partially cutaway perspective view of the motor for electric power steering according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of the back yoke and the bracket shown in FIG. 2.

도시된 바와 같이, 본 실시예에 따른 전동 파워 스티어링(Electric Power Steering ; 이하, 'EPS'라 함)용 모터(100)는 상면이 개방된 하우징(110)을 가지고, 하우징(110)의 상면에는 하우징(110)의 내부를 밀폐하는 브라켓(120)이 결합된다.As shown, the motor 100 for Electric Power Steering (hereinafter, referred to as "EPS") according to the present embodiment has a housing 110 having an open top surface, and is provided on the top surface of the housing 110. The bracket 120 for sealing the inside of the housing 110 is coupled.

하우징(110)의 저면 중앙부측 및 이와 대응되는 브라켓(120)의 부위에는 베어링(115,125)이 각각 고정되고, 베어링(115,125)에는 회전축(130)이 지지되어 회전가능하게 설치된다. 이때, 회전축(130)의 상단부측은 브라켓(120)의 상측으로 돌출되어 차량의 조향축(미도시)과 연결된다.Bearings 115 and 125 are respectively fixed to the central portion of the bottom surface of the housing 110 and corresponding brackets 120, and the rotating shafts 130 are supported to the bearings 115 and 125 so as to be rotatably installed. At this time, the upper end side of the rotating shaft 130 is protruded to the upper side of the bracket 120 is connected to the steering shaft (not shown) of the vehicle.

회전축(130)의 외주면에는 코어(141)가 고정되고, 코어(141)의 외주면에는 제 1 마그네트(145)가 고정된다. 그리고 하우징(110)의 내주면에는 제 1 마그네트(145)를 감싸는 형태로 코일(150)이 설치된다. 그리하여, 제 1 마그네트(145)에서 발생되는 자기장과 코일(150)에서 발생되는 전기장의 작용의 작용에 의하여 제 1 마그네트(145)가 회전하고, 이로인해 회전축(130)이 회전하면서 상기 조향축을 회전시킨다.The core 141 is fixed to the outer circumferential surface of the rotation shaft 130, and the first magnet 145 is fixed to the outer circumferential surface of the core 141. The coil 150 is installed on the inner circumferential surface of the housing 110 to surround the first magnet 145. Thus, the first magnet 145 is rotated by the action of the magnetic field generated in the first magnet 145 and the electric field generated in the coil 150, thereby rotating the steering shaft while the rotary shaft 130 rotates. Let's do it.

브라켓(120) 내부에 위치된 회전축(130)의 외주면에는 백요크(161)가 고정되고, 백요크(161)의 저면에는 제 2 마그네트(165)가 고정되는데, 백요크(161)와 제 2 마그네트(165)는 회전축(130)과 동일하게 회전한다. 그리고, 제 2 마그네트(165) 하측의 브라켓(120)에는 PCB(Printed Circuit Board)(미도시)가 고정된다. 상기 PCB에는 제 2 마그네트(165)의 위치를 감지하여 차량의 ECU(Electric Control Unit)로 전달하는 센서(미도시)가 마련된다. 즉, 상기 센서에서 감지한 제 2 마그네트(165)의 회전각도로 회전축(130)의 회전각도를 제어하는 것이다.The back yoke 161 is fixed to the outer circumferential surface of the rotating shaft 130 located inside the bracket 120, and the second magnet 165 is fixed to the bottom of the back yoke 161, wherein the back yoke 161 and the second The magnet 165 rotates in the same manner as the rotation shaft 130. In addition, a printed circuit board (PCB) (not shown) is fixed to the bracket 120 below the second magnet 165. The PCB is provided with a sensor (not shown) that detects a position of the second magnet 165 and transmits the detected position to the ECU (Electric Control Unit) of the vehicle. That is, the rotation angle of the rotation shaft 130 is controlled by the rotation angle of the second magnet 165 detected by the sensor.

차량이 정지한 상태 등과 같이 큰 부하가 작용하는 상태에서 조향을 하기 위해서는, 코일(150)에 높은 전류를 인가하여야 한다. 코일(150)에 높은 전류가 인가되면 많은 열이 발생되는데, 본 실시예에 따른 EPS용 모터에는 하우징(110) 내부의 열을 외부로 방출하는 수단이 마련된다.In order to steer in a state where a large load is applied, such as when the vehicle is stopped, a high current must be applied to the coil 150. When a high current is applied to the coil 150, a lot of heat is generated, and the EPS motor according to the present embodiment is provided with means for dissipating heat inside the housing 110 to the outside.

상세히 설명하면, 상기 수단은 브라켓(120)의 상면에 형성된 복수의 통공(127)과 백요크(161)의 저면에 형성된 복수의 그루브(Groove)(161a)로 마련된다. 제 1 마그네트(145)와 코일(150)의 작용에 의하여 회전축(130)이 회전하면, 백요크(161)도 회전한다. 백요크(161)가 회전하면, 백요크(161)의 저면에 형성된 그루브(161a)에 의하여 공기가 순환하므로, 하우징(110) 내부의 공기는 브라켓(120)의 통공(127)을 통하여 배출되고 하우징(110)의 외부의 공기는 통공(127)을 통하여 내부로 유입된다. 즉, 통공(127)을 통하여 공기가 출입하므로, 하우징(110) 내부의 열이 방출되는 것이다.In detail, the means is provided with a plurality of holes 127 formed on the upper surface of the bracket 120 and a plurality of grooves 161a formed on the bottom surface of the back yoke 161. When the rotating shaft 130 rotates by the action of the first magnet 145 and the coil 150, the back yoke 161 also rotates. When the back yoke 161 rotates, air is circulated by the groove 161a formed at the bottom of the back yoke 161, so that the air inside the housing 110 is discharged through the through hole 127 of the bracket 120. Air outside the housing 110 is introduced into the inside through the through hole 127. That is, since air enters and exits through the through hole 127, heat inside the housing 110 is released.

이상에서 설명한 바와 같이, 본 발명에 따른 EPS용 모터는 회전축과 동일하게 회전하는 백요크에 형성된 그루브로 인하여 하우징 내부의 공기가 순환하므로, 하우징 내부의 공기는 브라켓의 통공을 통하여 배출되고 하우징 외부의 공기는 통공을 통하여 하우징의 내부로 유입된다. 즉, 하우징 내부의 열이 방출되므로, 코일의 열화 및 마그네트의 감자가 방지된다. 그러므로, 내부발열에 의한 출력저하가 방지되어 출력이 향상된다.As described above, since the air inside the housing circulates due to the groove formed in the back yoke rotating in the same manner as the rotating shaft, the EPS motor according to the present invention is discharged through the hole in the bracket and the outside of the housing Air enters the inside of the housing through the through hole. That is, since heat inside the housing is released, deterioration of the coil and demagnetization of the magnet are prevented. Therefore, output reduction by internal heat generation is prevented and output is improved.

이상에서는, 본 발명의 일 실시예에 따라 본 발명을 설명하였지만, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자가 본 발명의 기술적 사상을 벗어나지 않는 범위 내에서 변경 및 변형한 것도 본 발명에 속함은 당연하다.In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.

Claims (2)

상면이 개방된 하우징;A housing having an open top surface; 상기 하우징의 내부에 회전가능하게 설치되며 조향축과 연결된 회전축;A rotating shaft rotatably installed in the housing and connected to a steering shaft; 상기 회전축의 외주면에 고정된 코어;A core fixed to an outer circumferential surface of the rotating shaft; 상기 코어의 외주면에 고정된 제 1 마그네트;A first magnet fixed to an outer circumferential surface of the core; 상기 제 1 마그네트를 감싸는 형태로 상기 하우징에 고정된 코일;A coil fixed to the housing in a form surrounding the first magnet; 상기 하우징의 상면에 결합된 브라켓;A bracket coupled to an upper surface of the housing; 상기 브라켓 내부의 상기 회전축 부위에 고정되어 상기 회전축과 동일하게 회전하는 백요크;A back yoke fixed to a portion of the rotation shaft inside the bracket and rotating the same as the rotation shaft; 상기 백요크의 저면에 결합되어 상기 회전축의 회전각도를 차량의 ECU로 전달하는 제 2 마그네트;A second magnet coupled to a bottom surface of the back yoke to transmit a rotation angle of the rotation shaft to the ECU of the vehicle; 상기 브라켓과 상기 백요크에 형성되어 상기 하우징 내부의 열을 외부로 방출시키는 수단을 포함하는 EPS용 모터.And a means formed in the bracket and the back yoke to dissipate heat inside the housing to the outside. 제 1 항에 있어서,The method of claim 1, 상기 수단은 상기 백요크의 저면에 형성되어 상기 하우징 내부의 공기를 순환시키는 복수의 그루브와 상기 브라켓에 형성되어 상기 하우징 내부 및 외부의 공기가 상기 하우징 외부 및 내부로 출입하는 것을 허용하는 통공인 것을 특징으로 하는 EPS용 모터.The means is formed in the bottom of the back yoke and a plurality of grooves for circulating the air in the housing and the through holes formed in the bracket to allow the air in and out of the housing to enter and exit the housing and inside EPS motor.
KR1020060031231A 2006-04-06 2006-04-06 Motor of electric power steering KR20070099891A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101385926B1 (en) * 2007-10-15 2014-04-15 현대모비스 주식회사 motor assembly for Electrical Power Steering
CN113328589A (en) * 2021-06-11 2021-08-31 深圳市凯昇科技有限公司 Heating method of magnet glue in iron shell of direct current motor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101385926B1 (en) * 2007-10-15 2014-04-15 현대모비스 주식회사 motor assembly for Electrical Power Steering
CN113328589A (en) * 2021-06-11 2021-08-31 深圳市凯昇科技有限公司 Heating method of magnet glue in iron shell of direct current motor

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