IE43174L - A motor having permanent magnet field magnets - Google Patents
A motor having permanent magnet field magnetsInfo
- Publication number
- IE43174L IE43174L IE761967A IE196776A IE43174L IE 43174 L IE43174 L IE 43174L IE 761967 A IE761967 A IE 761967A IE 196776 A IE196776 A IE 196776A IE 43174 L IE43174 L IE 43174L
- Authority
- IE
- Ireland
- Prior art keywords
- frame
- field magnets
- motor
- attachment
- permanent magnet
- Prior art date
Links
- 239000000696 magnetic material Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229920003319 Araldite® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with 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
- H02K5/15—Mounting arrangements for bearing-shields or end plates
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Dc Machiner (AREA)
- Magnetic Treatment Devices (AREA)
Description
4 317 4 The present invention relates to motors having permanent magnet field magnets.
Electric motors are frequently provided with a magnetic frame which supports the working members made 5 of magnetic material such as the pole pieces, field ina<)nel:;, <-tc. The motors ..uiy - frame with a metal cover termed an end-shield which includes a bearing for the armature shaft.
In the prior art, the pole pieces or permanent 10 magnet field magnets, which are formed e.g. by ferrite slabs, art; generally held in position on the frame by bonding with Araldite ( Trade Mark) or some other substance. To position and attach the end-shields on the framef systems of nuts and bolts or bonding means 15 are generally used.
The means mentioned above for holding the various component parts in place on the frame have proved to be costly and complicated and time-consuming. In addition, when nuts and bolts are used, it is not possible to 20 dismantle the motor quickly while the use of bonding means makes it difficult to dismantle the motor at all.
The present invention has as an object substantially to reduce or overcome the above disadvantages. 43174 Accordingly the invention consists in an electric motor having a hollow stator frame provided with end shields and with internal permanent magnet field magnets, and further comprising attachment devices for attaching 5 said end shields and field magnets to said frame, said attachment devices extending through holes in said frame and each having one* end which engages and presses one of the end shields against one end of said frame, and another end which presses one of said field magnets 10 against the interior of said frame.
The invention will now be further described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a dlagrammatic perspective view of part 15 of an embodiment of m electric motor according to the invention, having permanent magnet field magnets. For reasons of clarity, the rotor of the motor and its associated components are not shown, and Fig. 2 is a schematic view, in longitudinal 20 section along A-A' oi: Fig 1, of part of an electric motor according to the invention naving permanent magnet field magnets.
The motor in Fig. 1 is a D.C. motor which has a hollow frame 1 of magnetic material which has permanent 25 magnet field magnets 2 mounted against its inside face. The magnets 2, in tho embodiment being described, are formed by ferrite slabs. At either end the frame is provided with an end-shield, one of which is shown at 3 in Fig. 1. The end-shield 3 has a groove defining 30 annular flange 4 which defines a plurality of spaced grooves around its circumference, one of which is shown at 8, and which are intended to provide a firm seating for the outer portio; 9 of a device 5 for attaching and positioning both the end-shield 3 and the permanent 35 field magnets 2 on o: against, the .said frame 1. The attachment and positioning device 5, which is shown in the form of a clip, is formed by a steel wire whose elasticity is such as to allow it to act as a spring.
Clip 5, whose shape is substantially that of a U, has a plurality of portions, namely the portion 9 which represents the base of the U, and portions 6 which represent the ends of the sides of the U. The shape of the portion 9 corresponds to or is identical with the shape of the respective groove 8 in the end-shield. The portions 6 and the portion 9 are connected by linking portions 10, which are parallel in the embodiment being described and which represent the sides of the U. The function of the clip is to hold the end-shield 3 rigidly in position on the end of the frame 1 by means of its portion 9 and to attach the permanent field magnets 2 riyidly against the frame 1 by means of its portions 6.
To attach the end-shield 3 Lo the frame I, portion 9 of the clip engages elastically in the groove 8 of slightly larger dimensions which is formed in the flange 4, and to hold the magnets 2 in place, the portions 6 of the clip, which pass through holes 11 in the frame 1, fit into respective recesses 7 in the field magnets 2. The number of grooves 8 is equal to the number of clips. The clips thus form a means of positioning or angularly locating the end-shield 3.
The shape of the clip 5 enables pressure effects to be obtained from its outer portion 9 and its portions 6 to press the end-shield 3 and the field magnets 2 against the said frame 1, the pressures being represented by vectors P and P' in Figure 2.
Irrespective of the elastic characteristics of the material forming the clip 5, its overa]1 elastic action is produced, in particular, by bends formed in the clip which are shown at C, D, E, F, ir. Figure 2.
In the embodiment described, qiven that the motor 4 317 4 has two field magnets, the clips 5, which are two in number {at each end of the motor) and one of which is shown in Figs. 1 and 2, are symmetrical about the axis of symmetry of the motor and consequently about the 5 axis of symmetry of the frame.
The clips which form the attachment and positioning means perform two functions namely, attaching and positioning the end shields on the one hand, and on the other hand the permanent field magnets on or to the 10 frame 1.
They also make it possible to reduce assembly time, by allowing the whole operation to be performed at the same time, which makes a considerable saving. 43174
Claims (5)
1. An electric motor having a hollow stator frame provided with end shields and with internal permanent magnet field magnets, and further comprising attachment 5 devices for attaching said end shields and field magnets to said frame, said attachment devices extending through holes in said frame and each having one end which engages and presses one of the end shields against one end of said frame, and another end which presses one of 10 said field magnets against the interior of said frame.
2. A motor as claimed in claim 1, wherein each end shield has an annular groove-defining flange to receive the ends of the attachment devices associated therewith. 15
3. A motor as claimed in claim 1 or claim 2, wherein the field magnets have recesses for receiving the ends of the said attachment devices associated therewith .
4. A motor as claimed in any one of the preceding 20 claims, wherein each attachment device comprises a wire folded into the general shape of a U, the base of the U forming said end of the device which engages one end shield, and the arms of the U having end portions which press against the associated field magnet. 25
5. An electric motor substantially as hereinbefore described with reference to the accompanying drawings. F. R. KELLY £ CO. AGENTS FOR THE APPLICANTS.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7527327A FR2323262A1 (en) | 1975-09-05 | 1975-09-05 | PERMANENT MAGNET INDUCTOR MOTOR |
Publications (2)
Publication Number | Publication Date |
---|---|
IE43174L true IE43174L (en) | 1977-03-05 |
IE43174B1 IE43174B1 (en) | 1980-12-31 |
Family
ID=9159675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
IE1967/76A IE43174B1 (en) | 1975-09-05 | 1976-09-03 | A motor having permanent magnet field magnets |
Country Status (17)
Country | Link |
---|---|
AT (1) | AT346416B (en) |
BE (1) | BE845826A (en) |
CH (1) | CH597710A5 (en) |
DE (1) | DE2639779A1 (en) |
DK (1) | DK144228C (en) |
ES (1) | ES451174A1 (en) |
FI (1) | FI762517A (en) |
FR (1) | FR2323262A1 (en) |
GB (1) | GB1549876A (en) |
GR (1) | GR61613B (en) |
IE (1) | IE43174B1 (en) |
IT (1) | IT1063654B (en) |
LU (1) | LU75709A1 (en) |
NL (1) | NL7609756A (en) |
NO (1) | NO141625C (en) |
SE (1) | SE7609761L (en) |
YU (1) | YU209976A (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2462804A2 (en) * | 1979-07-25 | 1981-02-13 | Ferodo Sa | Small permanent magnet DC motor - has yoke used also as clamping ring for stator housing halves |
FR2539930B1 (en) * | 1983-01-20 | 1986-03-14 | Peugeot Aciers Et Outillage | ELECTRIC MOTOR, PARTICULARLY FOR A MOTOR VEHICLE ACCESSORY |
FR2562734B1 (en) * | 1984-04-05 | 1988-05-06 | Ducellier & Cie | STATOR FOR SMALL ELECTRIC MOTORS |
US5444318A (en) * | 1994-02-22 | 1995-08-22 | Black & Decker Inc. | Motor with permanent magnet actuated brake |
JP2002186213A (en) * | 2000-12-15 | 2002-06-28 | Minebea Co Ltd | Motor |
DE102013205652A1 (en) * | 2013-03-28 | 2014-10-02 | Robert Bosch Gmbh | Magnetic holding spring, and electric machine including such, as well as methods for producing the electrical machine |
-
1975
- 1975-09-05 FR FR7527327A patent/FR2323262A1/en active Granted
-
1976
- 1976-08-30 YU YU02099/76A patent/YU209976A/en unknown
- 1976-09-01 FI FI762517A patent/FI762517A/fi not_active Application Discontinuation
- 1976-09-01 GR GR51601A patent/GR61613B/en unknown
- 1976-09-02 ES ES451174A patent/ES451174A1/en not_active Expired
- 1976-09-02 NL NL7609756A patent/NL7609756A/en not_active Application Discontinuation
- 1976-09-02 IT IT26777/76A patent/IT1063654B/en active
- 1976-09-03 DE DE19762639779 patent/DE2639779A1/en not_active Withdrawn
- 1976-09-03 SE SE7609761A patent/SE7609761L/en unknown
- 1976-09-03 IE IE1967/76A patent/IE43174B1/en unknown
- 1976-09-03 BE BE170327A patent/BE845826A/en unknown
- 1976-09-03 NO NO763036A patent/NO141625C/en unknown
- 1976-09-03 AT AT655576A patent/AT346416B/en not_active IP Right Cessation
- 1976-09-03 LU LU75709A patent/LU75709A1/xx unknown
- 1976-09-03 GB GB36690/76A patent/GB1549876A/en not_active Expired
- 1976-09-03 CH CH1123376A patent/CH597710A5/xx not_active IP Right Cessation
- 1976-09-03 DK DK399276A patent/DK144228C/en active
Also Published As
Publication number | Publication date |
---|---|
FI762517A (en) | 1977-03-06 |
NO141625C (en) | 1980-04-16 |
CH597710A5 (en) | 1978-04-14 |
GR61613B (en) | 1978-12-02 |
YU209976A (en) | 1982-02-25 |
DK144228C (en) | 1982-06-21 |
GB1549876A (en) | 1979-08-08 |
AT346416B (en) | 1978-11-10 |
DE2639779A1 (en) | 1977-03-17 |
IT1063654B (en) | 1985-02-11 |
DK399276A (en) | 1977-03-06 |
NO141625B (en) | 1980-01-02 |
NL7609756A (en) | 1977-03-08 |
SE7609761L (en) | 1977-03-06 |
ATA655576A (en) | 1978-03-15 |
NO763036L (en) | 1977-03-08 |
ES451174A1 (en) | 1977-08-16 |
IE43174B1 (en) | 1980-12-31 |
LU75709A1 (en) | 1978-04-27 |
DK144228B (en) | 1982-01-18 |
FR2323262A1 (en) | 1977-04-01 |
BE845826A (en) | 1977-03-03 |
FR2323262B1 (en) | 1981-12-04 |
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