US20140356200A1 - Electric Pump - Google Patents

Electric Pump Download PDF

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Publication number
US20140356200A1
US20140356200A1 US14/294,840 US201414294840A US2014356200A1 US 20140356200 A1 US20140356200 A1 US 20140356200A1 US 201414294840 A US201414294840 A US 201414294840A US 2014356200 A1 US2014356200 A1 US 2014356200A1
Authority
US
United States
Prior art keywords
motor
pump
thermistor
terminal
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.)
Abandoned
Application number
US14/294,840
Other languages
English (en)
Inventor
Chikeung CHAN
Yunbo YANG
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
Assigned to JOHNSON ELECTRIC S.A. reassignment JOHNSON ELECTRIC S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHAN, CHIKEUNG, YANG, YUNBO
Publication of US20140356200A1 publication Critical patent/US20140356200A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0693—Details or arrangements of the wiring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0005—Control, e.g. regulation, of pumps, pumping installations or systems by using valves
    • F04D15/0016—Control, e.g. regulation, of pumps, pumping installations or systems by using valves mixing-reversing- or deviation valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4293—Details of fluid inlet or outlet
    • 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
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
    • 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
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/145—Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes
    • 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
    • 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

Definitions

  • This invention relates to an electric motor driven pump and in particular, to an electric pump having overcurrent protection.
  • an electric pump may be used to spray water or a detergent solution on to the windshield or head lamps.
  • the water or detergent within the pump may freeze, preventing the impeller from rotating.
  • a fuse can be located between the motor and its power source, and arranged to break if the motor exceeds a certain temperature.
  • replacement of the fuse incurs additional maintenance costs, and can be a cumbersome process.
  • the electric pump may include electrical noise suppression components to prevent the pump from interfering with other electrical components and devices.
  • the present invention provides an electric pump for pumping liquid, comprising: a pump housing defining a pump chamber; an impeller disposed in the pump chamber; and an electric motor for driving the impeller, the motor comprising: a stator defining a plurality of magnetic poles; and a rotor configured to rotate relative to the stator, the rotor comprising: a shaft; a rotor core fixed to the shaft; a commutator fixed to the shaft adjacent one end of the rotor core; and a plurality of winding coils wrapped around the rotor core and electrically connected to the commutator; first and second motor terminals configured to be connected to an external power source; first and second brushes in sliding contact with the commutator; and a positive temperature coefficient thermistor, wherein the first brush is electrically connected to the first motor terminal through the thermistor; and the second brush is electrically connected to the second motor terminal.
  • the brushes, the thermistor, and the motor terminals are mounted on an end cap located on an axial end of the motor.
  • the brushes and the thermistor are mounted on a printed circuit board mounted on the end cap of the motor.
  • the pump includes a pump cover incorporating a connector housing accommodating the motor terminals, with a first end of the motor terminals disposed in the connector for connection to a power supply and a second end of the motor terminals being inserted in respective sockets disposed on the end cap.
  • the pump has one or more inductors, respectively electrically connected between the brushes and the motor terminals.
  • a varistor is connected to the two motor terminals in series with the thermistor.
  • a first capacitor connects a terminal of the thermistor not connected to the first motor terminal to ground, and a second capacitor connects the second motor terminal to ground.
  • the capacitors are connected to a ground terminal that is connected to a motor housing of the motor.
  • the pump is configured to pump water or a detergent solution onto an automobile windshield.
  • FIG. 1A is a perspective view of an electric pump having a motor in accordance with the preferred embodiment of the present invention
  • FIG. 1B is a sectional view of the pump of FIG. 1A ;
  • FIGS. 2A and 2B illustrate an end cap assembly for the motor of FIG. 1A ;
  • FIG. 5 is a graph showing the electrical properties of a thermistor used in the motor of FIG. 1A .
  • FIGS. 1A and 1B illustrate an electric pump 10 used for pumping a liquid, in accordance with the preferred embodiment of the present invention.
  • FIG. 1B is a longitudinal sectional view taken along the axis of the pump, which is coaxial with the axis of the motor.
  • the liquid pump 10 is used in a vehicle to spray water, a detergent, or other type of liquid, onto a windshield. It is understood that in other embodiments, pump 10 may be used in any type of application that involves the pumping of a liquid.
  • Pump 10 comprises a motor 20 , a pump chamber 11 , and an impeller 14 connected to and driven by motor 20 .
  • the impeller is accommodated within the pump chamber.
  • Pump chamber 11 has an inlet 52 connecting the pump chamber to a source of liquid (e.g., a water or detergent container) and at least one outlet 54 through which, in use, the liquid is discharged.
  • a source of liquid e.g., a water or detergent container
  • outlet 54 through which, in use, the liquid is discharged.
  • motor 20 rotates impeller 14 creating a centrifugal force so that liquid flowing in from the inlet 52 is expelled through outlet 54 .
  • the pump chamber is defined by the space formed between a pump housing 12 and a pump plate 13 .
  • the pump has two outlets 54 interconnected by a diverter valve 17 .
  • the direction of rotation of the impeller determines through which outlet the liquid will be pumped.
  • motor 20 comprises a stator 21 , a rotor 22 rotatably mounted to stator 21 , and an end cap assembly 30 .
  • Stator 21 comprises a motor housing 24 and a plurality of magnets 25 fixed to an inner wall of motor housing 24 .
  • Magnets 25 are permanent magnets, although it is understood that magnets 25 may comprise any type of component capable of generating a magnetic field and/or defining a magnetic pole, including electro-magnets.
  • motor housing 24 is substantially cylindrical.
  • the motor housing is a deep drawn cup-shaped metal part having one open end and one closed end.
  • Rotor 22 comprises a shaft 26 , a commutator 27 and a rotor core 28 attached to shaft 26 , and a plurality of winding coils 29 wound around rotor core 28 and connected to commutator 27 .
  • One axial end of shaft 26 is rotatably attached to one end of motor housing 24 , preferably the closed end by a bearing 23 .
  • the other axial end of shaft 26 is rotatably attached to end cap assembly 30 by another bearing 23 .
  • Bearings 12 may be ball bearings, bearing sleeves, or any other components that provide mechanical coupling between moving and stationary parts, allowing rotor 22 to rotate relative to stator 21 .
  • End cap assembly 30 comprises an end cap 32 and a circuit board assembly 34 fixed to end cap 32 .
  • brushes 31 are connected to circuit board assembly 34 , and positioned on opposite sides of commutator 27 , such that, when motor 20 is assembled, brushes 31 are able to maintain sliding contact with a surface of commutator 27 .
  • the illustrated brushes are of the leaf brush type, having a brush terminal 31 a fixed to the circuit board, a brush body 31 b arranged to make sliding contact with the commutator and connected to the brush terminal, electrically and mechanically, by a resilient brush arm 31 c.
  • the brush body is of a carbon based material and the brush arm urges the brush body against the commutator.
  • other types of brushes may be used.
  • Circuit board assembly 34 may comprise a printed circuit board (PCB) 36 , and a plurality of electrical components, including a pair of motor terminals 38 a/b, a pair of chokes or inductors 40 a/b, a pair of sockets 42 a/b, a varistor 46 , capacitors 50 a/b, and a positive temperature coefficient thermistor (PTC) 44 .
  • FIG. 5 is a graph illustrating the electrical properties of PTC 44 in accordance with the preferred embodiment.
  • PCB 36 is configured such that some of the electrical components (e.g, inductors 40 a/b, and thermistor assembly 44 ) are arranged on one side of PCB 36 , while the opposite side of PCB 36 carries a plurality of electrical traces connecting the electrical components in accordance with the circuit diagram illustrated in FIG. 4 .
  • Brushes 31 , inductors 40 a and 40 b, sockets 42 a and 42 b, varistor 46 and PTC 44 are connected to PCB 36 by soldering.
  • Motor terminals 38 a/b are arranged to be connected to an external power source (not shown), such as a battery, generator, or outlet. Motor terminals 38 a/b connect to the electrical components on PCB 36 by being pressed into sockets 42 a/b.
  • sockets 42 a/b are substantially U-shaped, each comprising a pair of clamping ends 43 . At least one end of each pair of clamping ends 43 is substantially V-shaped and arranged such that a minimum gap between the ends of each pair of clamping ends 43 is smaller than a thickness of the motor terminals, allowing for motor terminals 38 a/b to be inserted into corresponding sockets 42 a/b and held in place by clamping ends 43 .
  • both clamping ends of each pair of clamping ends are V-shaped and contact each other at the apex of the V in the relaxed state.
  • motor terminal 38 a is electrically connected to one of the bushes 31 through PTC 44 and inductor 40 a, while motor terminal 38 b is connected to the other brush 31 through inductor 40 b.
  • PTC 44 comprises a thermistor element 44 b mounted between a pair of metal strips forming the thermistor terminals 44 a and 44 c.
  • One thermistor terminal 44 c is connected to motor terminal 38 a and the other thermistor terminal 44 a is connected to inductor 40 a.
  • This arrangement may be used to improve the physical strength of PTC 44 .
  • due to the mass of the thermistor terminals the temperature rise of the thermistor may be dampened slightly to allow the PTC to be less sensitive to sudden transient current surges.
  • inductors 40 are connected in series between brushes 31 and motor terminals 38 , wherein the inductive properties of the inductors function to stabilize the current flow through winding coils 29 .
  • each motor terminal 38 a/b is connected to a respective inductor 40 a/b.
  • the motor terminals may be connected to earth via a capacitor 50 a/b.
  • circuit board assembly 34 further comprises a ground terminal 48 to which one terminal of each of capacitors 50 a/b is connected. The other terminal is electrically connected to the terminals of inductors 40 a/b which are connected to motor terminals 38 a/b, respectively.
  • ground terminal 48 is fixed to PCB 36 and connected to an edge of end cap 32 , such that when end cap assembly 30 is assembled to motor housing 24 , ground terminal 48 is connected to outer shell 24 .
  • circuit board assembly 34 further comprises a varistor 46 , wherein one terminal of varistor 46 is electrically connected to the terminal of inductor 40 a that is connected to motor terminal 38 a, while the other terminal of varistor 46 is electrically connected to the terminal of inductor 40 b that is connected to motor terminal 38 b.
  • Varistor 46 exhibits a high resistance at low voltages, but a low resistance at high voltages. During operation, if the voltage across the motor terminals experiences a sudden fluctuation, e.g. a voltage spike caused by commutation, excess current caused by the spike in voltage can be shunted through the varistor, limiting the size of the voltage spike, thus further stabilizing the current drawn by motor 20 .
  • stator 21 a motor 20 having an inner rotor design with rotor 22 accommodated and configured to rotate within stator 21
  • other configurations may be used in other embodiments, e.g., a brushless motor, or a motor having an outer rotor design with the stator being accommodated within the rotor.
  • inductors 40 a/b may be connected to one or more stator winding coils instead of electric brushes 31 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Current Collectors (AREA)
US14/294,840 2013-06-03 2014-06-03 Electric Pump Abandoned US20140356200A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310215238.1A CN104218739A (zh) 2013-06-03 2013-06-03 用于汽车雨刮的洗涤泵
CN201310215238.1 2013-06-03

Publications (1)

Publication Number Publication Date
US20140356200A1 true US20140356200A1 (en) 2014-12-04

Family

ID=51899597

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/294,840 Abandoned US20140356200A1 (en) 2013-06-03 2014-06-03 Electric Pump

Country Status (4)

Country Link
US (1) US20140356200A1 (de)
JP (1) JP2015008623A (de)
CN (1) CN104218739A (de)
DE (1) DE102014107707A1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107061305A (zh) * 2017-03-29 2017-08-18 东莞市江盈泵业制造有限公司 一种智能高效节能水泵及其智能控制电路
US20180091025A1 (en) * 2016-09-29 2018-03-29 Minebea Mitsumi Inc. Dc motor
US20180320778A1 (en) * 2016-05-27 2018-11-08 Ghsp, Inc. Thermistor flow path
US10903716B2 (en) * 2017-09-29 2021-01-26 Makita Corporation Electric working machine
US11306733B2 (en) * 2016-05-31 2022-04-19 Mitsuba Corporation Washer pump having a pair of flow paths with the pump side of one of the flow paths being smaller than the valve chamber side of the one flow path
US11959481B2 (en) 2016-05-27 2024-04-16 Ghsp, Inc. Thermistor flow path

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6543730B2 (ja) * 2015-12-25 2019-07-10 日立オートモティブシステムズエンジニアリング株式会社 直流電動機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5080554A (en) * 1989-07-31 1992-01-14 Asmo Co., Ltd. Windscreen washer pump for vehicle
US5734243A (en) * 1996-09-23 1998-03-31 Navistar International Transportation Corp. Dual control of windshield wiper system
US20100320854A1 (en) * 2009-06-22 2010-12-23 Mabuchi Motor Co. Ltd. Motor

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5307509B2 (ja) * 2007-12-14 2013-10-02 アスモ株式会社 モータ、及びサーミスタの製造方法
JP4861305B2 (ja) * 2007-12-28 2012-01-25 マブチモーター株式会社 有ブラシｄｃモータのケース蓋組立体
JP5777898B2 (ja) * 2011-02-08 2015-09-09 株式会社ミツバ 電動モータ、および電動モータの製造方法
CN202157972U (zh) * 2011-08-01 2012-03-07 温岭市真奇汽车零部件有限公司 汽车用微型洗涤泵

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5080554A (en) * 1989-07-31 1992-01-14 Asmo Co., Ltd. Windscreen washer pump for vehicle
US5734243A (en) * 1996-09-23 1998-03-31 Navistar International Transportation Corp. Dual control of windshield wiper system
US20100320854A1 (en) * 2009-06-22 2010-12-23 Mabuchi Motor Co. Ltd. Motor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Ceramics Databook, (Hiroaki Yanagida, Kogyo-seihin Gijyutsu, Kyokai (Japan), CRC Press, 1987 - p.661) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180320778A1 (en) * 2016-05-27 2018-11-08 Ghsp, Inc. Thermistor flow path
US11454235B2 (en) 2016-05-27 2022-09-27 Ghsp, Inc. Thermistor flow path
US11788528B2 (en) 2016-05-27 2023-10-17 Ghsp, Inc. Thermistor flow path
US11959481B2 (en) 2016-05-27 2024-04-16 Ghsp, Inc. Thermistor flow path
US11306733B2 (en) * 2016-05-31 2022-04-19 Mitsuba Corporation Washer pump having a pair of flow paths with the pump side of one of the flow paths being smaller than the valve chamber side of the one flow path
US11795968B2 (en) 2016-05-31 2023-10-24 Mitsuba Corporation Washer pump with a respiratory hole communicating a motor accommodating portion and an outside
US20180091025A1 (en) * 2016-09-29 2018-03-29 Minebea Mitsumi Inc. Dc motor
US10873235B2 (en) * 2016-09-29 2020-12-22 Minebea Mitsumi Inc. DC motor with a positive temperature coefficient thermistor
CN107061305A (zh) * 2017-03-29 2017-08-18 东莞市江盈泵业制造有限公司 一种智能高效节能水泵及其智能控制电路
US10903716B2 (en) * 2017-09-29 2021-01-26 Makita Corporation Electric working machine

Also Published As

Publication number Publication date
DE102014107707A1 (de) 2014-12-04
CN104218739A (zh) 2014-12-17
JP2015008623A (ja) 2015-01-15

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Date Code Title Description
AS Assignment

Owner name: JOHNSON ELECTRIC S.A., SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHAN, CHIKEUNG;YANG, YUNBO;REEL/FRAME:033021/0954

Effective date: 20140529

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION