GB2174253A - Electric motor - Google Patents
Electric motor Download PDFInfo
- Publication number
- GB2174253A GB2174253A GB08607805A GB8607805A GB2174253A GB 2174253 A GB2174253 A GB 2174253A GB 08607805 A GB08607805 A GB 08607805A GB 8607805 A GB8607805 A GB 8607805A GB 2174253 A GB2174253 A GB 2174253A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shielding case
- elastic member
- motor
- heat
- case cover
- 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
Links
- 239000013536 elastomeric material Substances 0.000 claims description 2
- 239000002985 plastic film Substances 0.000 claims description 2
- 238000010292 electrical insulation Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
Classifications
-
- 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
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
- H02K9/223—Heat bridges
-
- 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
- H02K11/40—Structural association with grounding devices
-
- 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
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0201—Thermal arrangements, e.g. for cooling, heating or preventing overheating
- H05K1/0203—Cooling of mounted components
- H05K1/0204—Cooling of mounted components using means for thermal conduction connection in the thickness direction of the substrate
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
- H02K2211/03—Machines characterised by circuit boards, e.g. pcb
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0302—Properties and characteristics in general
- H05K2201/0311—Metallic part with specific elastic properties, e.g. bent piece of metal as electrical contact
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10166—Transistor
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10265—Metallic coils or springs, e.g. as part of a connection element
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10416—Metallic blocks or heatsinks completely inserted in a PCB
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Motor Or Generator Cooling System (AREA)
- Motor Or Generator Frames (AREA)
Abstract
An electric motor has a motor proper installed in a shielding case together with a printed circuit board on which a control circuit for controlling the motor is mounted. An elastic member provides a heat conductive path between an integrated circuit heat dissipator in the control circuit and the shielding case so that heat generated in the integrated circuit is dissipated to the shielding case via the elastic member. <IMAGE>
Description
SPECIFICATION
Electric motor
This invention relates to electric motors.
So-called "miniature" electric motors are commonly employed in motor driven devices such as tape recorders, for example. Often such motors comprise a motor proper within a shielding case and a control circuit for controlling motor revolution. Control circuits for such electric motors are being made increasingly compact as a result of miniaturizing of circuit elements by the use of integrated circuits and like techniques and by mounting the control circuit on a printed circuit board. As a result of such miniaturization, a problem arises in how effectively to dissipate heat generated in the integrated circuit.
It has previously been suggested to overcome the heat dissipation problem by installing a printed circuit board incorporating integrated circuits outside the shielding case, or alternatively by employing a metallic board having a high heat dissipating effect as the printed circuit board. Provision of a printed circuit board externally of the shielding case may require that additional space be provided for the motor and related parts. Use of a metallic printed circuit board, on the other hand, may give rise to increased material costs.
The present invention has arisen from our work in seeking to overcome these problems.
In accordance with the present invention, there is provided an electric motor having a motor proper installed in a shielding case and a printed circuit board, on which a control circuit for controlling the motor is mounted, installed in a space in said shielding case, and an elastic member providing a heat conductive path between an integrated circuit heat dissipator in said control circuit and said shielding case so that the heat generated in said integrated circuit is dissipated to said shielding case via said elastic member.
The invention is hereinafter more particularly described by way of example only with reference to the accompanying drawings, in which:
Figure 1 is a longitudinal cross-sectional view of a miniature electric motor constructed in accordance with this invention;
Figure 2(A) is an end elevational view of the motor of Fig. 1 as seen in the direction A-A with the shielding case cover and damper omitted and the side wall of the case in section;
Figure 2(B) is an enlarged sectional view through the motor of Figs. 1 and 2(A) taken along the line B-B in Fig. 2(A); and
Figure 3 is a view similar to Fig. 2(B) for an alternative embodiment.
Fig. 1 shows the general construction of one embodiment of miniature motor in accordance with this invention. The motor proper 1 is installed in a shielding case 2 which includes a shielding case cover 2' for closing its open mouth. To make the motor size compact, a printed circuit board 3 incorporating a control circuit comprising capacitors, integrated circuits (ICs) 5, etc. is installed in a space between the motor proper 1 and the shielding case cover 2'. Elastomeric vibration dampers 4 and 4' are used to prevent the motor proper 1 and the printed circuit board 3 from moving within the shielding case 2.
This invention permits the printed circuit board 3 to be installed in the shielding case 2 as shown in Fig. 1, and for the heat in the IC 5 to be effectively dissipated.
In the first embodiment shown in Figs. 2(A) and 2(B), a housing 9 in which an elastic member in the form of a metallic spring 8 is installed is provided by forming a through-hole on the printed circuit board 3 and the vibration damper 4'. The location of the housing 9 corresponds to the location of the heat dissipator 6 of the IC 5. The metallic spring 8 is made of an electrically conductive metal having good heat conductivity. The outside diameter of the metallic spring 8 in its unbiased state is chosen to be larger than the separation P between the shielding case cover 2' and the heat dissipator 6. Consequently, with the metallic spring 8 installed, it makes elastic contact with both the shielding case cover 2' and the heat dissipator 6.As a result, the heat generated in the IC 5 is transmitted from the heat dissipator 6 to the shielding case cover 2' and further to the shielding case 2 proper via the metallic spring 8, and thus effectively dissipated by the shielding case cover 2' and the shielding case 2 proper, both having larger heat dissipating areas. The metallic spring 8 not only plays a role in heat conduction but also serves as a grounding means because of its electrical conductivity.
Where there is a particular need to electrically insulate the metallic spring 8 and the shielding case cover 2', an electrically insulating sheet, such as a plastic sheet, may be interposed between the metallic spring 8 and the shielding case cover 2'.
The second embodiment of this invention shown in Fig. 3 has a similar construction to the first embodiment shown in Figs. 2(A) and 2(B). Whereas the outer periphery of the metallic spring 8 makes contact with the shielding case cover 2' and the heat dissipator 6 in the first embodiment shown in Figs. 2(A) and 2(B), the spring of the second embodiment shown in Fig. 3 is a coil or compression spring with its respective axial end faces making elastic contact with the shielding case cover 2' and the heat dissipator 6.
In the foregoing embodiments shown in
Figs. 2(A) and 2(B), and Fig. 3 the elastic member was a spring 8. This invention, however, is not limited to this arrangement: any elastic member having good thermal conductivity, for example, made of electrically conductive elastomeric material, may be used, in place of the metallic spring, as a means for transmitting the heat generated in the IC 5.
As will be seen from the above description, this invention enables the production of embodiments of miniature electric motor of a compact size in which a printed circuit board incorporating a control circuit is installed inside a shielding case, heat generated in an IC being transmitted to a shielding case having a larger heat dissipating area via an elastic member having good thermal (and optionally electrical) conductivity. The elastic member, if electrically conductive, has a grounding effect which is beneficial. The elastic member contributes significantly to cost reduction since an inexpensive printed circuit board made of phenol and other synthetic resins can be used as the printed circuit board itself need not dissipate heat generated in the IC.
Claims (6)
1. An electric motor having a motor proper installed in a shielding case and a printed circuit board, on which a control circuit for controlling the motor is mounted, installed in a space in said shielding case, and an elastic member providing a heat conductive path between an integrated circuit heat dissipator in said control circuit and said shielding case so that the heat generated in said integrated circuit is dissipated to said shielding case via said elastic member.
2. A motor according to Claim 1, wherein an elastomeric vibration damper is provided within said shielding case; and said elastic member comprises a metallic spring; a housing for said metallic spring being provided by forming a through-hole in said printed circuit board and said damper, disposed at a location corresponding to the location of said integrated circuit heat dissipator, and constructed so that the outer periphery of the metallic spring makes contact with the shielding case cover and with the heat dissipator.
3. A motor according to Claim 2, wherein said metallic spring is a coil spring positioned with its respective axial end faces in elastic contact with the shielding case cover and heat dissipator.
4. A motor according to Claim 1, wherein said elastic member is formed of an electrically and thermally conductive elastomeric material and is constructed so that said elastomeric member makes elastic contact with said shielding case cover, with said heat dissipator and with an elastomeric vibration damper within said shielding case.
5. A motor according to Claim 1, wherein said shielding case includes a shielding case cover, said elastic member being disposed to provide said heat conductive path between said heat dissipator and said shielding case cover, said elastic member being electrically as well as thermally conductive, and an electrically insulating sheet, such as a plastic sheet, being interposed between said elastic member and said shielding case cover to provide electrical insulation.
6. An electric motor substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1985049410U JPH0526936Y2 (en) | 1985-04-03 | 1985-04-03 |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8607805D0 GB8607805D0 (en) | 1986-04-30 |
GB2174253A true GB2174253A (en) | 1986-10-29 |
GB2174253B GB2174253B (en) | 1988-10-12 |
Family
ID=12830282
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08607805A Expired GB2174253B (en) | 1985-04-03 | 1986-03-27 | Electric motor assembly |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPH0526936Y2 (en) |
KR (2) | KR860008638A (en) |
CN (1) | CN1017852B (en) |
GB (1) | GB2174253B (en) |
HK (1) | HK35991A (en) |
SG (1) | SG80791G (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2201297A (en) * | 1986-12-13 | 1988-08-24 | Grundfos Int | Association of electric motor and frequency converter |
WO1991001060A1 (en) * | 1989-07-11 | 1991-01-24 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft | Electric-motor-driven window operating system |
US5049769A (en) * | 1988-12-17 | 1991-09-17 | Ebm Elektrobau Mulfingen Gmbh & Co. | Collectorless external-rotor motor with semiconductor cooling system |
GB2251522A (en) * | 1990-12-07 | 1992-07-08 | Ist Lab Ltd | An electric motor |
DE4231784A1 (en) * | 1991-06-22 | 1994-03-24 | Teves Gmbh Alfred | Electrically-driven hydraulic pump - cools control stage for collectorless electric motor by hydraulic fluid handled by pump |
EP0744811A2 (en) * | 1995-05-26 | 1996-11-27 | Eastman Kodak Company | Method of coil mounting for maximum heat transfer in DC brushless motors |
WO1997049162A1 (en) * | 1996-06-18 | 1997-12-24 | Wilo Gmbh | Electric motor |
FR2821497A1 (en) * | 2001-02-27 | 2002-08-30 | Bosch Gmbh Robert | Windscreen wiper transmission has motor, mechanical transmission box, motor regulating electrical component plate, heat conducting element and lid with recess to accommodate electronic components |
EP1271749A1 (en) * | 2001-06-27 | 2003-01-02 | Behr GmbH & Co. | Electric motor |
WO2008049759A1 (en) * | 2006-10-24 | 2008-05-02 | Brose Fahrzeugteile Gmbh & Co. Kg, Würzburg | Electric motor actuating drive |
CN101064454B (en) * | 2006-04-28 | 2011-04-13 | 日本电产株式会社 | Motor having heat-dissipating structure for circuit component and fan unit including the motor |
WO2011057930A3 (en) * | 2009-11-16 | 2011-12-15 | Siemens Aktiengesellschaft | Electronic assembly and method for the production thereof |
WO2011020812A3 (en) * | 2009-08-20 | 2011-12-29 | Siemens Aktiengesellschaft | Intelligent drive unit |
ITBO20130063A1 (en) * | 2013-02-14 | 2014-08-15 | Spal Automotive Srl | ELECTRIC MACHINE. |
JP2015186356A (en) * | 2014-03-24 | 2015-10-22 | 日本電産コパル株式会社 | motor unit |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101783539A (en) * | 2010-03-19 | 2010-07-21 | 南京远航车辆驱动技术发展有限公司 | Coaxial centrally-mounted driving assembly for electric vehicle with built-in controller |
JP6039887B2 (en) * | 2011-04-14 | 2016-12-07 | セイコーエプソン株式会社 | robot |
JP6346422B2 (en) * | 2012-11-08 | 2018-06-20 | 日本電産サーボ株式会社 | motor |
CN111283657B (en) * | 2018-12-06 | 2021-12-24 | 台达电子工业股份有限公司 | Robot mechanism |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5316109B2 (en) * | 1973-09-13 | 1978-05-30 | ||
JPS5316109U (en) * | 1976-07-22 | 1978-02-10 |
-
1985
- 1985-04-03 JP JP1985049410U patent/JPH0526936Y2/ja not_active Expired - Lifetime
-
1986
- 1986-03-22 CN CN86101921A patent/CN1017852B/en not_active Expired
- 1986-03-27 GB GB08607805A patent/GB2174253B/en not_active Expired
- 1986-03-28 KR KR1019860002340A patent/KR860008638A/en not_active Application Discontinuation
-
1990
- 1990-02-27 KR KR2019900002148U patent/KR900003398Y1/en not_active IP Right Cessation
-
1991
- 1991-05-09 HK HK359/91A patent/HK35991A/en not_active IP Right Cessation
- 1991-10-05 SG SG807/91A patent/SG80791G/en unknown
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2201297A (en) * | 1986-12-13 | 1988-08-24 | Grundfos Int | Association of electric motor and frequency converter |
GB2201297B (en) * | 1986-12-13 | 1991-01-02 | Grundfos Int | Electric motor arrangement with integral static frequency converter |
US5049769A (en) * | 1988-12-17 | 1991-09-17 | Ebm Elektrobau Mulfingen Gmbh & Co. | Collectorless external-rotor motor with semiconductor cooling system |
WO1991001060A1 (en) * | 1989-07-11 | 1991-01-24 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft | Electric-motor-driven window operating system |
US5245258A (en) * | 1989-07-11 | 1993-09-14 | Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft | Electrically powered power window unit |
GB2251522A (en) * | 1990-12-07 | 1992-07-08 | Ist Lab Ltd | An electric motor |
DE4231784A1 (en) * | 1991-06-22 | 1994-03-24 | Teves Gmbh Alfred | Electrically-driven hydraulic pump - cools control stage for collectorless electric motor by hydraulic fluid handled by pump |
EP0744811A2 (en) * | 1995-05-26 | 1996-11-27 | Eastman Kodak Company | Method of coil mounting for maximum heat transfer in DC brushless motors |
EP0744811A3 (en) * | 1995-05-26 | 1997-09-03 | Eastman Kodak Co | Method of coil mounting for maximum heat transfer in DC brushless motors |
US6091174A (en) * | 1996-06-18 | 2000-07-18 | Wilo Gmbh | Electric motor |
WO1997049162A1 (en) * | 1996-06-18 | 1997-12-24 | Wilo Gmbh | Electric motor |
FR2821497A1 (en) * | 2001-02-27 | 2002-08-30 | Bosch Gmbh Robert | Windscreen wiper transmission has motor, mechanical transmission box, motor regulating electrical component plate, heat conducting element and lid with recess to accommodate electronic components |
EP1271749A1 (en) * | 2001-06-27 | 2003-01-02 | Behr GmbH & Co. | Electric motor |
CN101064454B (en) * | 2006-04-28 | 2011-04-13 | 日本电产株式会社 | Motor having heat-dissipating structure for circuit component and fan unit including the motor |
WO2008049759A1 (en) * | 2006-10-24 | 2008-05-02 | Brose Fahrzeugteile Gmbh & Co. Kg, Würzburg | Electric motor actuating drive |
WO2011020812A3 (en) * | 2009-08-20 | 2011-12-29 | Siemens Aktiengesellschaft | Intelligent drive unit |
WO2011057930A3 (en) * | 2009-11-16 | 2011-12-15 | Siemens Aktiengesellschaft | Electronic assembly and method for the production thereof |
ITBO20130063A1 (en) * | 2013-02-14 | 2014-08-15 | Spal Automotive Srl | ELECTRIC MACHINE. |
WO2014125412A1 (en) * | 2013-02-14 | 2014-08-21 | Spal Automotive S.R.L. | Electrical machine |
RU2641659C2 (en) * | 2013-02-14 | 2018-01-19 | Спаль Аутомотиве С.Р.Л. | Electrical machine |
US9912211B2 (en) | 2013-02-14 | 2018-03-06 | Spal Automotive S.R.L. | Electrical machine |
JP2015186356A (en) * | 2014-03-24 | 2015-10-22 | 日本電産コパル株式会社 | motor unit |
Also Published As
Publication number | Publication date |
---|---|
HK35991A (en) | 1991-05-17 |
SG80791G (en) | 1991-11-15 |
JPH0526936Y2 (en) | 1993-07-08 |
KR860008638A (en) | 1986-11-17 |
CN1017852B (en) | 1992-08-12 |
KR900003398Y1 (en) | 1990-04-23 |
CN86101921A (en) | 1986-10-08 |
GB8607805D0 (en) | 1986-04-30 |
GB2174253B (en) | 1988-10-12 |
JPS61165068U (en) | 1986-10-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PE20 | Patent expired after termination of 20 years |
Effective date: 20060326 |