GB2445775A - Electric motor having releasable connection for pcba - Google Patents

Electric motor having releasable connection for pcba Download PDF

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Publication number
GB2445775A
GB2445775A GB0700837A GB0700837A GB2445775A GB 2445775 A GB2445775 A GB 2445775A GB 0700837 A GB0700837 A GB 0700837A GB 0700837 A GB0700837 A GB 0700837A GB 2445775 A GB2445775 A GB 2445775A
Authority
GB
United Kingdom
Prior art keywords
pcba
electric motor
motor
housing
terminals
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.)
Withdrawn
Application number
GB0700837A
Other versions
GB0700837D0 (en
Inventor
Ben To Fan Wong
Hong Wei Zhang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Johnson Electric SA
Original Assignee
Johnson Electric SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Johnson Electric SA filed Critical Johnson Electric SA
Priority to GB0700837A priority Critical patent/GB2445775A/en
Publication of GB0700837D0 publication Critical patent/GB0700837D0/en
Publication of GB2445775A publication Critical patent/GB2445775A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/525—Annular coils, e.g. for cores of the claw-pole type
    • 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
    • H02K11/0094—Structural association with other electrical or electronic devices
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

An electric motor 10 comprises a motor housing 12, a stator 16 received within the housing, a shaft 14 supported for rotation within the housing, a rotor core mounted on the shaft 14 and juxtaposed to the stator 16, terminals 38 for electrical connection to a power source for energizing the motor, and a PCBA connector 42 having latch and detent holding means 68,70 for holding a PCBA 60 on the motor in solderless releasable spring-biased electrical contact with the terminals 38. A ground connection 184 to the machine casing 180 may be included.

Description

I
ELECTRIC MOTOR HAVING RELEASABLE CONNECTION FOR PCBA
Background of the Invention
The present invention relates to an electric motor having a PCBA connector for holding a PCBA on the motor in solderless releasable spring-biased electrical contact with the terminals of the motor, and to a method of selectively mounting a PCBA to such an electric motor.
It is known to mount a printed circuit board assembly (PCBA) to a motor housing, and to then solder contacts on the PCBA to the terminals of the motor. However, this requires that customers receiving the motor from the motor manufacturer have the necessary machinery to electrically connect their customer-specific PCBA for the required application of the motor, or for the customer to ask the motor manufacturer to also supply the required PCBA. This clearly causes some inconvenience and impacts customer care.
Cold-joints when soldering electrical contacts are also problematic, especially in tight and confined spaces, such as when connecting to miniature or small electric motors.
The present invention therefore seeks to provide a solution to these problems.
Summary of the Invention
According to a first aspect of the invention, there is provided an electric motor comprising a motor housing, a stator received within the housing, a shaft supported for rotation within the housing, a rotor core mounted on the shaft and juxtaposed to the stator, terminals for electrical connection to a power source for energising the motor, and a PCBA connector having holding means for holding a PCBA on the motor in releasable spring-biased electrical contact with the terminals.
Preferably, the holding means of the PCBA connector comprises a PCBA housing defining a slot for slidable insertion of the PCBA.
Preferably, the PCBA housing is oriented so that an insertion direction of the PCBA into the slot is parallel or substantially parallel with the rotational axis of the motor shaft.
Preferably, the PCBA housing is fixedly mounted on the motor housing.
Preferably, the PCBA housing includes an opening for accessing the terminals.
Preferably, the terminals are spring biased for urging against the PCBA.
Preferably, a bobbin is housed in the housing, the bobbin including terminal supports on which the spring-biased terminals are provided.
Preferably, the terminals are question-mark shaped.
Preferably, the terminals extend into the PCBA connector.
Preferably, the PCBA connector includes detent means for cooperating with the PCBA to releasably retain the PCBA on the motor.
Preferably, the detent means of the PCBA connector includes a ramped projection for location over an edge of the PCBA to inhibit extraction.
Preferably, the ramped projection is integrally formed as part of the PCBA connector.
According to a second aspect of the invention, there is provided an electric motor in accordance with the first aspect of the invention, in combination with a PCBA, the PCBA being held in stationary relationship on the motor by the holding means of the PCBA connector in releasable spring-biased electrical contact with the terminals.
Preferably, the PCBA includes a surface mounted electrical contact strip for electrical contact with one or each of the terminals of the electric motor.
According to a third aspect of the invention, there is provided a method of selectively mounting a PCBA to an electric motor in accordance with the first aspect of the invention, the method comprising the steps of: a) selecting a PCBA; and b) push-fit engaging the PCBA with the PCBA connector of the electric motor, so that the holding means holds the PCBA stationary on the motor and releasable spring-biased electrical contact with the terminals is made.
Brief Description of the Drawings
Embodiments of the present invention will now be more particularly described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a first embodiment of an electric motor, in accordance with the first aspect of the invention, and having a PCBA mounted thereon in accordance with the second aspect of the invention; Figure 2 shows a side cross-sectional view of the electric motor shown in Figure 1, with the PCBA fitted; Figure 3 is an enlarged sectional side view of a portion of the PCBA connector; Figure 4 is a perspective view from below of terminal links and terminals of the electric motor, and a portion of an underside of the PCBA, when mounted on the motor; Figure 5 is a perspective view of one terminal link, and associated terminal; Figure 6 is a perspective view of a PCBA connector housing and terminals; Figure 7 is a perspective view from below showing a cross-section of the PCBA connector and terminals shown in Figure 6, with a PCBA fitted; and Figure 8 is a perspective view from below, showing terminals in contact with the PCBA, according to a second embodiment.
Detailed Description of the Preferred Embodiments
Referring firstly to Figures 1 to 5 of the drawings, there is shown a first embodiment of an electric motor 10 which comprises a motor housing 12 and a shaft 14 supported for rotation within the motor housing 12. A stator 16 is provided within the motor housing 12, adjacent to an interior surface of the motor housing 12, and a rotor core 18 is provided on the shaft 14, juxtaposed to the stator 16.
The electric motor 10 can be any type of motor, and for example may be a sub-miniature, miniature, or small PMDC motor, or a stepper motor.
The electric motor 10 preferably includes two bobbins 20 and 22 on which windings 24 and 26 are received. A plurality of electrically conductive, typically bronze tin-plated, terminal links 28, in this case being four, extend from an opening 30 in the motor housing 12. As best see in Figures 4 and 5, each terminal link 28 includes a first end 32 which is forked and a supporting second end 34 which is opposite the first end 32. The terminal links 28 are supported by the motor housing 12 or, as shown in Figure 2, directly attached to the respective bobbins 20, 22, and the ends of the associated windings 24, 26 are mechanically engaged with the respective terminal links 28 by being urged into the forks of the first ends 32.
The supporting second end 34 of each terminal link 28 includes a curved portion 36 on which a respective terminal 38 is seated. Each terminal 38 is an elongate leaf element formed in a substantially question-mark ? shape of a resiliently deformable electrically conductive material, for example, beryllium copper. This provides spring biasing of a distal end of the terminal 38 in a direction away from an end proximal to the terminal link 28, and the supporting second end 34 promotes this spring-biasing.
The proximal end of the terminal 38 is riveted at 40 to the supporting second end 34 of the terminal link 28, as best shown in Figure 5. Optionally, the rivets are upset rivets pressed out of the body of the terminal link 28. The terminal 38 is thus seated on and is positively supported by the terminal link 28.
The motor 10 also includes a PCBA connector 42 which comprises a, typically moulded plastics, PCBA housing 44 having holding means for positively retaining the PCBA on or in the PCBA connector 42. The holding means is in the form of a slot 46 defined in the PCBA housing 44. The PCBA housing 44 is generally rectangular, but has arcuately profiled lower edges 48 to match the curvature of the outer surface 50 of the motor housing 12. The PCBA housing 44 locates over the terminals 38 which project in a generally radial direction from the motor housing 12, and is typically held in place on the motor housing 12 via snap-fit engagement means.
The snap-fit engagement means typically comprises a projecting ramped tab 52 on each side of an end cap 54 of the motor housing 12, and a corresponding flexible arm 56 which has an aperture 58 and which projects from the PCBA housing 44. As the end cap 54 and the PCBA housing 44 are brought together, the arms 40 ride up the respective tabs 52 until each tab 52 locates in its respective aperture 58, thus resulting in releasable engagement. Additional snap fit fingers 51 extend generally radially inwards from the PCBA housing 44 and releasably engage an edge of opening 30 of the motor housing 12.
The slot 46 of the PCBA housing 44 is dimensioned to accept a PCBA 60 as a sliding push fit. As such, the slot 46 has a slot opening 62 adjacent to the end cap 54 of the motor housing 12 for receiving the PCBA 60, and the slot 46 extends away from the slot opening 62 in a direction substantially parallel with the rotational axis of the motor shaft 14.
The PCBA housing 44 has a first housing opening 64 at its base to enable the terminals 38 to project therethrough, and a second housing opening 66 in its upper surface, through which the terminals 38 can be observed and accessed prior to insertion of the PCBA 60. This is beneficial in allowing maintenance of the terminals 38. For example if one of the terminals 38 has been undesirably deformed, it can be easily reformed to adopt its correct position.
The PCBA connector 42 also includes detent means for retaining the PCBA 60 in the PCBA housing 44 once inserted. The detent means comprises a ramped detent 68 which is integrally formed on the interior upper surface of the PCBA housing 44, adjacent to the second housing opening 66. The ramped detent 68 projects into the PCBA housing 44, and more particularly into the slot 46.
The PCBA 60 is formed with a detent aperture 70 adjacent to its leading edge 72 for complementary engagement with the ramped detent 68. Release is possible using a tool, such as a small screwdriver, to prise a trailing face 74 of the ramped detent 68 out of the aperture 70, thus allowing extraction of the PCBA 60 from the PCBA housing 44.
In use, a PCBA 60 is firstly selected. A leading portion 76 of the PCBA 60 is dimensioned to fit the slot 46 of the PCBA housing 44. The PCBA 60 typically comprises a power supply connector 78 for connection to a power supply. However, other circuit components can be incorporated as part of the PCBA, dependent on the requirements of the customer and the use of the motor.
Spaced electrical contact strips 80, typically being copper pads, are provided on one of the major surfaces 82 of the PCBA 60. The electrical contact strips 80 are spaced in accordance with the spacing between the spring-biased terminals 38.
With the PCBA 60 correctly oriented, the leading edge 72 of the PCBA 60 is inserted into the slot 46 of the PCBA housing 44, and slid home until the ramped detent 68 engages with the detent aperture 70. As the PCBA 60 is slid into the PCBA housing 44, the spring-biased terminals 38 ride over the leading edge 72 of the PCBA 60, slide along the major surface 82 of the PCBA 60, and onto their respective electrical contact strips 80. The spring-biasing of the terminals 38, assisted by the curved portions 36 of the terminal links, thus results in resilient electrical contact being formed between the terminals 38 and the contact strips 80.
Referring to Figure 8, there is shown a second embodiment of an electric motor 10.
Like references refer to like parts, and further detailed description is omitted.
In this embodiment, additional grounding of the PCBA 160 with the motor housing 12 is provided. In this case, a metal component of the motor housing 12 is provided with a grounding element 184. The grounding element 184 is identical to the terminals 38 described above. However, the terminal link 28 is replaced by connection to the metal component of the motor housing 12. In the embodiment shown, the metal component is a stator plate 180 and the terminal link is a finger or projection 182 extending from the stator plate 180.
As can be seen in Figure 8, PCBA 160 is provided with a further electrical contact strip 188, which in use is electrically earthed. Consequently, as the PCBA 160 is inserted into the slot 46 of the PCBA housing 44, the terminals 38 and the grounding element 184 slide along the major surface 82 of the PCJ3A 160 and come to rest on their respective contact strips, thus resulting in a resilient electrical connection being formed.
Reliable releasable spring-biased electrical contact is thus made between the PCBA and the terminals of the motor, without the requirement for soldering or the use of other permanent electrical engagement means. This makes it particularly convenient for a customer to selectively choose which PCBA to use with the motor. it is also possible for the motor to be used in a wider variety of applications, since it is a simple matter to insert a specifically adapted PCBA into the PCBA connector. Furthermore, reliable electrical connection is assured, without the possibility of cold-spots. Due to the spring-biased terminals, cracking or dislodgement of solder resulting in loss of electrical connection is no longer a problem.
The embodiments described above are given by way of examples only, and various other modifications will be apparent to persons skilled in the art without departing from the scope of the invention, as defined by the appended claims.

Claims (15)

1. An electric motor comprising a motor housing, a stator received within the housing, a shaft supported for rotation within the housing, a rotor core mounted on the shaft and juxtaposed to the stator, terminals for electrical connection to a power source for energising the motor, and a PCBA connector having holding means for holding a PCBA on the motor in releasable spring-biased electrical contact with the terminals.
2. An electric motor as claimed in Claim 1, wherein the holding means of the PCBA connector comprises a PCBA housing defining a slot for slidable insertion of the PCBA.
3. An electric motor as claimed in Claim 2, wherein the PCBA housing is oriented so that an insertion direction of the PCBA into the slot is parallel or substantially parallel with the rotational axis of the motor shaft.
4. An electric motor as claimed in Claim 2 or 3, wherein the PCBA housing is fixedly mounted on the motor housing.
5. An electric motor as claimed in Claim 2, 3 or 4, wherein the PCBA housing includes an opening for accessing the terminals.
6. An electric motor as claimed in any one of the preceding claims, wherein the terminals are spring biased for urging against the PCBA.
7. An electric motor as claimed in Claim 6, ftirther comprising a bobbin housed in the housing, the bobbin including terminal supports on which the spring-biased terminals are provided.
8. An electric motor as claimed in Claim 6 or 7, wherein the terminals are question-mark shaped.
9. An electric motor as claimed in any one of the preceding claims, wherein the terminals extend into the PCBA connector.
10. An electric motor as claimed in any one of the preceding claims, wherein the PCBA connector includes detent means for cooperating with the PCBA to releasably retain the PCBA on the motor.
11. An electric motor as claimed in Claim 10, wherein the detent means of the PCBA connector includes a ramped projection for location over an edge of the PCBA to inhibit extraction.
12. An electric motor as claimed in Claim 11, wherein the ramped projection is integrally formed as part of the PCBA connector.
13. An electric motor as claimed in any one.of the preceding claims, in combination with a PCBA, the PCBA being held in stationary relationship on the motor by the holding means of the PCBA connector in releasable spring-biased electrical contact with the terminals.
14. A combination as claimed in Claim 13, wherein the PCBA includes a surface mounted electrical contact strip for electrical contact with one or each of the terminals of the electric motor.
15. A method of selectively mounting a PCBA to an electric motor as claimed in any one of claims I to 12, the method comprising the steps of: a) selecting a PCBA; and b) push-fit engaging the PCBA with the PCBA connector of the electric motor, so that the holding means holds the PCBA stationary on the motor and releasable spring-biased electrical contact with the tenninals is made.
GB0700837A 2007-01-17 2007-01-17 Electric motor having releasable connection for pcba Withdrawn GB2445775A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0700837A GB2445775A (en) 2007-01-17 2007-01-17 Electric motor having releasable connection for pcba

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0700837A GB2445775A (en) 2007-01-17 2007-01-17 Electric motor having releasable connection for pcba

Publications (2)

Publication Number Publication Date
GB0700837D0 GB0700837D0 (en) 2007-02-21
GB2445775A true GB2445775A (en) 2008-07-23

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Family Applications (1)

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GB0700837A Withdrawn GB2445775A (en) 2007-01-17 2007-01-17 Electric motor having releasable connection for pcba

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011067015A1 (en) * 2009-12-03 2011-06-09 Robert Bosch Gmbh Electronically commutated electric motor having reduced interference emission
WO2011057930A3 (en) * 2009-11-16 2011-12-15 Siemens Aktiengesellschaft Electronic assembly and method for the production thereof
WO2014114463A3 (en) * 2013-01-26 2015-08-13 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Rotary electric machine
WO2019166080A1 (en) * 2018-02-28 2019-09-06 Pierburg Pump Technology Gmbh Electric motor vehicle auxiliary unit
IT202000002512A1 (en) * 2020-02-10 2021-08-10 Denso Thermal Systems Spa Mounting configuration of an electronic control board on a brushed electric motor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095958A1 (en) * 1982-05-27 1983-12-07 Pompes Salmson Electrical motor with coiled stator, and method for its manufacture
DE3614970A1 (en) * 1985-05-30 1986-12-04 VEB Elektrogerätewerk Suhl, DDR 6000 Suhl Arrangement for producing electrical connections in an electric motor
JP2003145046A (en) * 2001-11-13 2003-05-20 Matsushita Electric Ind Co Ltd Portable device and its vibration generator system
EP1633033A1 (en) * 2004-09-06 2006-03-08 Delta Electronics, Inc. Connector module and motor utilizing the same
WO2007012925A1 (en) * 2005-04-14 2007-02-01 Selta S.R.L. A plug-in unit for supplying and controlling an electric motor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0095958A1 (en) * 1982-05-27 1983-12-07 Pompes Salmson Electrical motor with coiled stator, and method for its manufacture
DE3614970A1 (en) * 1985-05-30 1986-12-04 VEB Elektrogerätewerk Suhl, DDR 6000 Suhl Arrangement for producing electrical connections in an electric motor
JP2003145046A (en) * 2001-11-13 2003-05-20 Matsushita Electric Ind Co Ltd Portable device and its vibration generator system
EP1633033A1 (en) * 2004-09-06 2006-03-08 Delta Electronics, Inc. Connector module and motor utilizing the same
WO2007012925A1 (en) * 2005-04-14 2007-02-01 Selta S.R.L. A plug-in unit for supplying and controlling an electric motor

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011057930A3 (en) * 2009-11-16 2011-12-15 Siemens Aktiengesellschaft Electronic assembly and method for the production thereof
WO2011067015A1 (en) * 2009-12-03 2011-06-09 Robert Bosch Gmbh Electronically commutated electric motor having reduced interference emission
CN102763307A (en) * 2009-12-03 2012-10-31 罗伯特·博世有限公司 Electronically commutated electric motor having reduced interference emission
JP2013513347A (en) * 2009-12-03 2013-04-18 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング Electronic rectification type motor with reduced interference radiation
US9018811B2 (en) 2009-12-03 2015-04-28 Robert Bosch Gmbh Electronically commutated electric motor having reduced interference emission
CN102763307B (en) * 2009-12-03 2015-11-25 罗伯特·博世有限公司 There is the motor of the electronic rectifier of the interference emission of reduction
WO2014114463A3 (en) * 2013-01-26 2015-08-13 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Rotary electric machine
US9899892B2 (en) 2013-01-26 2018-02-20 Brose Fahrzeugteile Gmbh & Co. Kommanditgesellschaft, Wuerzburg Rotary electric machine
WO2019166080A1 (en) * 2018-02-28 2019-09-06 Pierburg Pump Technology Gmbh Electric motor vehicle auxiliary unit
US11658551B2 (en) 2018-02-28 2023-05-23 Pierburg Pump Technology Gmbh Electric motor vehicle auxiliary unit
IT202000002512A1 (en) * 2020-02-10 2021-08-10 Denso Thermal Systems Spa Mounting configuration of an electronic control board on a brushed electric motor
EP3863159A1 (en) * 2020-02-10 2021-08-11 DENSO THERMAL SYSTEMS S.p.A. Arrangement for mounting an electronic control board to a brushed electric motor

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