GB2222316A - Electric motor with suppressor choke and terminal housing - Google Patents
Electric motor with suppressor choke and terminal housing Download PDFInfo
- Publication number
- GB2222316A GB2222316A GB8820088A GB8820088A GB2222316A GB 2222316 A GB2222316 A GB 2222316A GB 8820088 A GB8820088 A GB 8820088A GB 8820088 A GB8820088 A GB 8820088A GB 2222316 A GB2222316 A GB 2222316A
- Authority
- GB
- United Kingdom
- Prior art keywords
- motor
- terminal
- end cap
- cover
- housing
- 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- Withdrawn
Links
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
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
- H02K11/026—Suppressors associated with brushes, brush holders or their supports
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/36—Connections of cable or wire to brush
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Motor Or Generator Frames (AREA)
- Dc Machiner (AREA)
- Motor Or Generator Current Collectors (AREA)
Abstract
In a fractional horsepower PMDC motor a terminal 10 is mounted on the end cap 3 and a choke 13 is connected in series between the terminal 10 and brush 15. The choke and terminal are mounted on the outside of the casing and protected by a cover 18 which also supports the terminal 10. <IMAGE>
Description
ELECTRIC MOTOR
The present invention relates to a fractional horsepower PMDC motor including a suppression element electrically connected to brushgear of the motor.
It is known to install suppression elements on electric motors. Typically these may take the form of a capacitor connected between a motor brush and earth, a choke connected in series between the power supply and the motor brush, or even a varistor connected across segments of the commutator.
Suppression of electric motors is very important in modern automobiles where electrical interference may impair the functioning of on-board microprocessors which control the engine or brakes. There is therefore a demand for electric motors with the suppression elements built in to the motor.
The present invention provides a fractional horsepower PMDC motor having a housing comprising a can-like casing closed at one end and an end cap mounted on the open end of the casing, a rotor comprising a shaft and a commutator and wound armature mounted on the shaft, brushgear mounted inside the housing on the end cap, at least one terminal and a suppression element electrically connected to the brushgear and mounted outside of the housing on the end cap, wherein a cover is mounted on the housing, the cover enclosing the suppression element and having an aperture therein through which the terminal extends.
Preferably the terminal is supported by the cover. The end cap may be of plastics and the cover of metal. The terminal may be sleeved in plastics where it passes through the cover.
Preferably the end cap is a drawn can-like metal casing.
Other preferred features and advantages of the invention will be apparent from the following description and the accompanying claims.
The invention will be further described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a side view of a fractional horsepower
PMDC motor in accordance with the invention
Figure 2 shows a detail of the motor of Figure 1, partly cut away; and
Figure 3 is a schematic view on arrow A of Figure 2, partly cut away.
Figures 1 to 3 show a fractional horsepower PMDC motor which in the particular example shown is for driving a windscreen washer pump in an automobile.
The motor comprises a housing 1 having a deep drawn can-like steel casing 2 and a plastics end cap 3. The casing 2 is closed at one end by an integral wall 4 which carries a bearing 5 and at its other end by the end cap 3. End cap 3 carries a bearing 6 and a rotor shaft 7 runs in the bearings 5, 6. Two permanent magnets (not shown) are mounted in the casing 2, and shaft 7 carries a wound armature and a commutator (not shown).
The end cap 3 sits inside the open end of the casing 2 and is located by lugs 8 which fit in cutouts 9 in the end of the casing. The end cap 3 carries two terminal posts 10 which are each rivetted to a respective first contact plate 11 to make electrical contact therewith. The contact plates 11 are electrically connected to respective brush contact plates 12 via respective chokes 13, the choke wire being soldered to tags of the plates 11, 12 which project through the end cap 3. The plates 12 each carry a brushleaf 14 and brush 15. Brushes 15 are arranged to bear on the commutator (not shown).
The chokes 13 each rest in a saddle 16 adjacent a respective terminal 10 and are held lightly in place by a resilient finger 17.
To protect the chokes 13, a deep-drawn can-like steel cover 18 is mounted on the outside of the end cap 3. Cover 18 has two apertures 19 which snugly receive plastics sleeves 20 which surround and support the terminals 10. The sleeves 20 are integrally formed on the end cap 3. The cover 18 has rim 21 with lugs 22 which are received in the cutouts 9, outside of the lugs 8 of the end cap.
The cover 18 and end cap 3 are held on the casing 2 by turning the end 23 of the casing 2 over the rim 21 in the region of the lugs 22.
The cover 18 thus serves to protect the chokes 13 and to support the terminal posts 10, thus providing a more stable assembly for connecting the motor to a power supply.
Various modifications may be made to the described embodiment and it is desired to include all such modifications as fall within the scope of the accompanying claims.
Claims (8)
1. A fractional horsepower PMDC motor having a housing comprising a can-like casing closed at one end and an end cap mounted on the open end of the casing, a rotor comprising a shaft and a commutator and wound armature mounted on the shaft, brushgear mounted on the end cap inside the housing, at least one terminal and a suppression element electrically connected to the brushgear and mounted outside the housing on the end cap, wherein a cover is mounted on the housing, the cover enclosing the suppression element and having an aperture therein through which the terminal extends.
2. A motor as claimed in claim 1, wherein the cover supports the terminal.
3. A motor as claimed in claim 1 or 2, wherein the end cap is of plastics.
4. A motor as claimed in claim 1, 2 or 3, wherein the cover is a deep drawn can-like metal casing.
5. A motor as claimed in claim 4, wherein the terminal is sleeved in plastics where it penetrates the cover.
6. A motor as claimed in any one of claim;l to 5, wherein the suppression element is a choke in series between the terminal and a brush of the brushgear.
7. A motor as claimed in claim 6, having two said terminals and two chokes, each in series between a respectlve terminal and brush.
8. A fractional horsepower PVDC motor substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8820088A GB2222316A (en) | 1988-08-24 | 1988-08-24 | Electric motor with suppressor choke and terminal housing |
JP1989099019U JPH0260467U (en) | 1988-08-24 | 1989-08-24 | |
DE8910161U DE8910161U1 (en) | 1988-08-24 | 1989-08-24 | Electric motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8820088A GB2222316A (en) | 1988-08-24 | 1988-08-24 | Electric motor with suppressor choke and terminal housing |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8820088D0 GB8820088D0 (en) | 1988-09-28 |
GB2222316A true GB2222316A (en) | 1990-02-28 |
Family
ID=10642626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8820088A Withdrawn GB2222316A (en) | 1988-08-24 | 1988-08-24 | Electric motor with suppressor choke and terminal housing |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPH0260467U (en) |
DE (1) | DE8910161U1 (en) |
GB (1) | GB2222316A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5563462A (en) * | 1993-08-11 | 1996-10-08 | Johnson Electric S.A. | Two-part end cap assembly |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2541034Y2 (en) * | 1990-09-29 | 1997-07-09 | アイシン精機株式会社 | Power supply device for motor |
-
1988
- 1988-08-24 GB GB8820088A patent/GB2222316A/en not_active Withdrawn
-
1989
- 1989-08-24 JP JP1989099019U patent/JPH0260467U/ja active Pending
- 1989-08-24 DE DE8910161U patent/DE8910161U1/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5563462A (en) * | 1993-08-11 | 1996-10-08 | Johnson Electric S.A. | Two-part end cap assembly |
CN1038801C (en) * | 1993-08-11 | 1998-06-17 | 德昌电机股份有限公司 | Two-part end cap assembly |
Also Published As
Publication number | Publication date |
---|---|
GB8820088D0 (en) | 1988-09-28 |
DE8910161U1 (en) | 1989-12-21 |
JPH0260467U (en) | 1990-05-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |