U.S. patent application number 14/523060 was filed with the patent office on 2015-02-12 for electric motor, in particular radiator fan motor.
The applicant listed for this patent is BROSE FAHRZEUGTEILE GMBH & CO. KOMMANDITGESELLSCHAFT, WUERZBURG. Invention is credited to JAN GWOZDZ, THOMAS HUSSY, FRANK MAUCH, TOBIAS OTT, THOMAS SCHENCKE, ARTUR SCHMIDT, HERMANN SCHULZ, THOMAS ZIEGLER.
Application Number | 20150042181 14/523060 |
Document ID | / |
Family ID | 46888362 |
Filed Date | 2015-02-12 |
United States Patent
Application |
20150042181 |
Kind Code |
A1 |
MAUCH; FRANK ; et
al. |
February 12, 2015 |
ELECTRIC MOTOR, IN PARTICULAR RADIATOR FAN MOTOR
Abstract
An electric motor, in particular a radiator fan motor of a motor
vehicle, has a rotor which is mounted such that it can rotate in
relation to a stator, a motor mount which has an electronics
compartment for accommodating a converter electronics system, and
an electronics compartment cover. The electronics compartment cover
has a peripheral sealing groove into which a peripheral edge of the
electronics compartment engages by way of a corresponding sealing
web in order to reliably seal off the electronics compartment.
Inventors: |
MAUCH; FRANK; (NUSPLINGEN,
DE) ; OTT; TOBIAS; (BALINGEN, DE) ; SCHENCKE;
THOMAS; (LANGEWIESEN, DE) ; SCHMIDT; ARTUR;
(WUERZBURG, DE) ; SCHULZ; HERMANN; (KLEINLANGHEIM,
DE) ; GWOZDZ; JAN; (WUERZBURG, DE) ; ZIEGLER;
THOMAS; (SCHWEBENRIED, DE) ; HUSSY; THOMAS;
(WITTIGHAUSEN, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BROSE FAHRZEUGTEILE GMBH & CO. KOMMANDITGESELLSCHAFT,
WUERZBURG |
WUERZBURG |
|
DE |
|
|
Family ID: |
46888362 |
Appl. No.: |
14/523060 |
Filed: |
October 24, 2014 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14206187 |
Mar 12, 2014 |
|
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|
14523060 |
|
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|
|
PCT/EP2012/003578 |
Aug 24, 2012 |
|
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14206187 |
|
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Current U.S.
Class: |
310/43 ;
310/68D |
Current CPC
Class: |
H02K 5/02 20130101; H02K
7/14 20130101; H02K 5/10 20130101; H02K 5/00 20130101; H02K 5/225
20130101; F04D 29/646 20130101; F04D 13/0686 20130101; H02K 3/522
20130101; H02K 11/33 20160101 |
Class at
Publication: |
310/43 ;
310/68.D |
International
Class: |
H02K 5/10 20060101
H02K005/10; H02K 5/02 20060101 H02K005/02; F04D 13/06 20060101
F04D013/06; H02K 7/14 20060101 H02K007/14; F04D 29/64 20060101
F04D029/64; H02K 5/22 20060101 H02K005/22; H02K 5/00 20060101
H02K005/00 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 12, 2011 |
DE |
102011112817.8 |
Claims
1. An electric motor, comprising: a stator with a stator-side
rotating-field winding; a rotor rotatably mounted with respect to
said stator; a motor mount formed with an electronics compartment
for accommodating a convertor electronics system, said electronics
compartment having openings formed therein wherein winding ends of
said stator-side rotating-field winding are introduced into said
electronics compartment via sealing elements; said sealing elements
each having a comparatively soft seal component and a comparatively
hard supporting component, and the respective said sealing element
sitting via said soft seal component thereof in the respective said
opening.
2. The electric motor according to claim 1, configured as a
radiator fan motor of a motor vehicle.
3. The electric motor according to claim 1, wherein said sealing
elements consist of a two-component plastic.
4. The electric motor according to claim 1, wherein said
comparatively soft seal component of said sealing element is a
labyrinth seal.
5. The electric motor according to claim 1, wherein said stator is
over-molded by a plastic casing, on which a plurality of caulking
nubs are integrally formed, and wherein said caulking nubs pass
through corresponding fixing openings formed on said motor mount
and are deformed in order to join said motor mount and said
stator.
6. The electric motor according to claim 5, wherein said
comparatively hard supporting component of the sealing component
sits in a receiving pocket formed in said plastic casing of said
stator.
7. The electric motor according to claim 5, wherein said
comparatively hard supporting component comprises at least one plug
pin, which engages in a corresponding plug opening in said plastic
casing of said stator.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application is a continuation of copending patent
application Ser. No. 14/206,187, filed Mar. 12, 2014, which was a
continuation of international patent application No.
PCT/EP2012/003578, filed Aug. 24, 2012, which designated the United
States; this application also claims the priority, under 35 U.S.C.
.sctn.119, of German patent application No. DE 10 2011 112 817.8,
filed Sep. 12, 2011; the prior applications are herewith
incorporated by reference in their entirety.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The invention relates to an electric motor, in particular a
brushless electric motor with an inner rotor, preferably a radiator
fan motor of a motor vehicle.
[0004] An electric motor of this type usually contains a rotor
which is mounted rotatably with respect to a stationary stator. In
the case of a brushless electric motor, the stator is often fitted
with a rotating-field winding, by which a magnetic rotating field
is produced by applying an alternating current to the winding. The
rotor arranged within the substantially hollow-cylindrical stator
is generally fitted with permanent magnets which generate a rotor
magnetic field alternating with the rotating field of the
stator.
[0005] In the case of a brushless electric motor, the alternating
current provided in order to feed the stator winding is usually
generated by a convertor (invertor). In the case of smaller
electric motors, the convertor is often accommodated together with
an associated control electronics unit in an electronics
compartment, which is integrated into the motor housing. Here, the
control electronics unit is to be protected against moisture, which
is why, in the case of such electric motors used for example as
radiator fan motors in motor vehicles, comparatively high demands
are placed on the tightness of the electronics compartment.
SUMMARY OF THE INVENTION
[0006] The object of the invention is therefore to specify an
electric motor of the aforementioned type, of which the electronics
unit is reliably sealed with minimal outlay.
[0007] There is provided, in accordance with the invention, an
electric motor, in particular a motor for a radiator fan. The novel
motor comprises: [0008] a stator with a stator-side rotating-field
winding; [0009] a rotor rotatably mounted with respect to the
stator; [0010] a motor mount formed with an electronics compartment
for accommodating a convertor electronics system, the electronics
compartment having openings formed therein wherein winding ends of
the stator-side rotating-field winding are introduced into the
electronics compartment via sealing elements; [0011] the sealing
elements each having a comparatively soft seal component and a
comparatively hard supporting component, and the respective sealing
element sitting via the soft seal component thereof in the
respective opening.
[0012] Accordingly, the electric motor, which is preferably
brushless and configured as an inner rotor, contains a rotor which
is mounted rotatably with respect to a stator, and contains a motor
mount. The motor mount forms or contains an electronics compartment
for accommodating a convertor electronics system. In addition to
the passive and active components, in particular such as a
plurality of power semiconductors which are connected in the form
of a bridge circuit, the converter electronics system contains a
printed circuit board which is fitted, inter alia with the
components.
[0013] An electronics compartment cover also referred to
hereinafter as a housing cover covers the electronics compartment
in a sealing manner. For this purpose, the electronics compartment
cover has a peripheral sealing groove and the motor mount, in the
region of the electronics compartment, has a sealing edge running
around the electronics compartment. The sealing edge is provided
with a sealing web which engages, in particular in a form-fitting
manner, in the sealing groove of the electronics compartment
cover.
[0014] The sealing web protrudes upwardly in a lobe-like manner
from the peripheral sealing edge and is integrally molded thereon,
forming sealing shoulders on either side. The dimensions of the
mount-side sealing edge on the one hand and of the cover-side
sealing groove on the other hand are selected in such a way that a
filling gap for receiving a sealing material remains between the
sealing web and the sealing groove. The sealing material is
preferably a sealing compound that becomes adhesive by heating.
[0015] When fitting the electronics compartment cover or housing
cover, in order to center the cover as precisely as possible and
therefore ensure a filling gap that is as uniform as possible for
the sealing compound, spacing pawls or nubs are molded into the
peripheral sealing groove on the cover side. Only a few spacing
pawls or nubs provided at exposed locations are required for a
corresponding sufficient centering and uniform gap formation. These
pawls or nubs are preferably integrally molded on the inner side of
the sealing groove, which is to say on the groove wall facing the
electronics compartment. The filling gap region that is formed
between the opposed outer-side groove wall of the cover-side
sealing groove and the sealing web thus remains free of
interruptions. It is thus ensured that at least this filling gap
region in the joined state between the housing cover and the
electronics compartment is filled with an interruption-free and
sufficiently voluminous length of the sealing material. A reliable
seal between the housing cover and the electronics compartment is
thus produced in a simple manner.
[0016] In order to provide a further or alternative measure for
centering, at least for roughly centering, and fixing, at least
roughly fixing, the housing cover on the motor mount, fixing clamps
are integrally molded on the housing cover, preferably on opposite
sides. These fixing clamps pass over the ribs, which are provided
on the motor mount and extend suitably radially, in order to
preferably lock together with the ribs.
[0017] In a suitable embodiment the stator is over-molded by a
plastic casing. A particularly reliable and easily produced
connection between the motor mount and the stator is expediently
achieved in that a number of caulking nubs are integrally formed on
the plastic casing of the stator and pass through fixing openings
provided on the motor mount. To join the motor mount and the stator
or the plastic casing thereof, the caulking nubs passing through
the fixing openings are, for example, hot-caulked and thus
deformed. Four caulking points of this type are suitably provided
between the substantially circular stator or the plastic casing
thereof and the suitably relatively flat motor mount produced as a
cast part.
[0018] The sealing concept according to the invention of the
electric motor additionally or alternatively contains sealing
elements that enable the winding ends or connection ends of the
stator-side rotating-field winding formed from coils to be passed
through into the electronics compartment in a sealed manner. For
this purpose, sealing elements are provided that are preferably
produced from a two-component plastic and that contain a
comparatively hard supporting component and a comparatively soft
seal component as a one-piece component part.
[0019] In the assembled state, the sealing elements sit with the
comparatively soft seal component thereof in openings that are
formed in the motor mount in the region of the base of the
electronics compartment. These soft seal components of the sealing
elements are formed suitably in the manner of a labyrinth seal.
[0020] The comparatively hard supporting components of the sealing
elements protrude on the mount side of the motor mount facing away
from the housing cover and facing toward the stator. Here, the
position of the sealing elements is selected in such a way that the
comparatively hard supporting components thereof are located
axially above the stator-side plastic casing. In order to position
the sealing elements in a manner aligned with the stator-side
plastic casing, receiving pockets are formed in the plastic casing,
in which the comparatively hard supporting components sit.
[0021] For a reliable positioning, fixing and/or stabilization,
plug pins, preferably two plug pins, are integrally formed on each
of the supporting components and can be inserted into corresponding
plug openings in the plastic casing in the region of the receiving
pockets, that is to say in the pocket bases thereof. Two openings
in each of the hard supporting components of the sealing elements
serve to pass through two winding ends which exit from the soft
seal components of the sealing elements and are contacted in the
assembled state within the electronics compartment with the
convertor electronics system arranged there, preferably producing a
delta connection of the coil windings or rotating-field
windings.
[0022] For a particularly reliable sealing of the winding ends at
the exit points thereof from the soft seal components, sealing
sleeves are integrally formed thereon and enclose the respective
winding end in a sealing manner.
[0023] The sealing concept for the winding ends of the
rotating-field winding or coils thereof by the sealing elements
constitutes an invention in itself. The electric motor in this
regard, in particular as a radiator fan motor for a motor vehicle,
contains a rotor which is mounted rotatably with respect to a
stator, and contains a motor mount containing an electronics
compartment for a convertor electronics system and having openings
within the electronics compartment. The winding ends of a
stator-side rotating-field winding are introduced into the
electronics compartment via sealing elements. The sealing elements,
which preferably consist of a two-component plastic, each have a
comparatively soft seal component and a comparatively hard
supporting component, wherein the seal element sits in a sealing
manner via the soft seal component thereof, which is suitably
formed as a labyrinth seal, in the respective opening in the motor
mount or electronics compartment.
[0024] In an advantageous embodiment of this electric motor the
stator is over-molded by a plastic casing, in which receiving
pockets are molded, in which the hard supporting component of the
respective sealing element sits. The further embodiments of the
seal elements also apply similarly to this electric motor according
to the invention.
[0025] The joint between the motor mount and the stator over-molded
by the plastic casing, the joint being provided by the caulking
nubs integrally molded on the plastic casing, also constitutes an
independent invention. The electric motor in this regard, in
particular as a radiator fan motor for a motor vehicle, contains a
rotor which is mounted rotatably with respect to a stator, and
containing motor mount, wherein the stator is over-molded by a
plastic casing. At least one caulking nub, preferably a plurality
of caulking nubs, are integrally molded on the plastic casing and
pass through the corresponding caulking or fixing openings in the
motor mount and can be deformed, preferably can be hot-formed, in
order to join the motor mount and the stator.
[0026] Other features which are considered as characteristic for
the invention are set forth in the appended claims.
[0027] Although the invention is illustrated and described herein
as embodied in an electric motor, in particular a radiator fan
motor, it is nevertheless not intended to be limited to the details
shown, since various modifications and structural changes may be
made therein without departing from the spirit of the invention and
within the scope and range of equivalents of the claims.
[0028] The construction and method of operation of the invention,
however, together with additional objects and advantages thereof
will be best understood from the following description of specific
embodiments when read in connection with the accompanying drawings
(examples).
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0029] FIG. 1 is a diagrammatic, exploded, perspective view of a
radiator fan for a motor vehicle with its own cooled, brushless
inner rotor motor with integrated convertor electronics system
according to the invention;
[0030] FIG. 2 is a perspective view from a connection side of the
motor according to FIG. 1;
[0031] FIG. 3 is a plan view of the motor according to FIG. 1 with
removed electronics compartment cover (housing cover);
[0032] FIG. 4 is a perspective view of the electronics compartment
cover from an inner side thereof;
[0033] FIG. 5 is a perspective view of a motor mount of the
electric motor, looking into the electronics compartment without
convertor electronics system;
[0034] FIG. 6 is a perspective view of detail VI shown in FIG. 4 on
an enlarged scale with a fixing clamp integrally molded on a
housing cover and with a spacing pawl in a cover sealing
groove;
[0035] FIG. 7 is a sectional view of a centering joint between the
housing cover and the edge of the electronics compartment of the
motor mount;
[0036] FIG. 8 is a perspective view according to FIG. 2 of a detent
connection between the cover-side fixing clamp and a mount-side
rib;
[0037] FIG. 9 is a perspective view of the stator of the motor, the
stator being wound by coils of a rotating-field winding, with an
over-molded plastic casing with caulking nubs and with winding ends
guided via sealing elements, according to FIG. 8 the effect of the
rotor being that of inherent cooling of the motor in the event of
rotor rotation against the reference rotation direction;
[0038] FIG. 10 is a perspective view according to FIG. 5, of the
motor mount joined to the over-molded stator, as viewed from a
caulking point;
[0039] FIG. 11 is a perspective view of the rotating-field winding
with winding ends thereof guided through sealing elements;
[0040] FIG. 12 is a perspective view of the winding and a sealing
element arrangement according to FIG. 11 with a fitted motor mount;
and
[0041] FIG. 13 is a perspective view of the arrangement according
to FIG. 11 inclusive of stator laminated core.
DETAILED DESCRIPTION OF THE INVENTION
[0042] Parts and dimensions corresponding to one another are always
provided in all figures with like reference signs. Referring now to
the figures of the drawings in detail and first, particularly to
FIG. 1 thereof, there is shown an exploded view of a fan 1 for a
radiator of a motor vehicle. The fan 1 contains an impeller 2 with
a central cap 3, around the outer circumference of which (only
illustrated in part) air guide vanes 4 are uniformly distributed.
The fan 1 further contains an electric motor 5, also referred to as
a fan motor, by which the impeller 2 is driven in rotation.
[0043] The motor 5 is formed substantially by a stator 6, on which
a three-phase rotating-field winding 7 is wound in the form of
coils. The motor 5 further contains a permanently excited rotor 8,
which is mounted rotatably about a motor axis 9 within the stator
6. In order to mount the rotor 8, the motor 5 contains two rolling
bearings 10 and 11, which act on the rotor 8 from axially opposed
sides. The axial play of the rotor 8 between the two rolling
bearings 10 and 11 is spring-loaded here by a spring washer 12.
[0044] The motor 5 further contains an approximately disk-shaped
motor mount 13. An electronics compartment 14 is introduced into
the motor mount 13 at an end face facing away from the impeller 2,
a convertor electronics system 15 being inserted into the
electronics compartment. In order to tightly close the electronics
compartment 14, the motor 5 contains an electronics compartment
cover 16, also referred to hereinafter as a housing cover.
[0045] The rotor 8 is formed (in a manner not illustrated in
greater detail) by a laminated core, into which permanent magnets
for generating an exciting field are inserted, wherein the
laminated core is over-molded together with the inserted permanent
magnets by a plastic casing. Similarly, the stator 6 also contains
a laminated core that is over-molded by a plastic casing.
[0046] The motor mount 13 is formed in particular by a one-piece
die-cast part made of aluminum. The electronics compartment cover
16 is preferably an injection-molded part made of plastic.
[0047] On its front face, the rotor 8 is provided with four screw
bosses 18, by which the rotor 8 is screwed to the impeller 2 in the
assembled state. The motor 5 and therefore the entire fan 1 is
fastened to the vehicle via the motor mount 13, which for this
purpose is provided with three screw tabs 19 protruding from its
outer circumference. The motor 5 is a brushless inherently cooled
inner rotor motor.
[0048] In the assembled state of the motor 5 shown in FIG. 2 the
stator 6 is fixedly attached on a front face of the motor mount 13.
The rotor 8 is inserted into the stator 6 over-molded by the
plastic casing 20, wherein the rotor 8 is flanked on both axial
sides by one of the two rolling bearings 10 and 11. The rolling
bearings 10 and 11 are mounted here in a manner not illustrated in
greater detail on an axial pin which is in turn fastened to the
motor mount 13.
[0049] FIG. 3 shows the motor 5 with a removed electronics
compartment cover 16, looking into the electronics compartment 14
with convertor electronics system 15 arranged therein. Supply lines
(positive and negative pole or ground pole) 21a and sensor or data
lines 21b of a connection cable 21 are led to or contacted with the
convertor electronics system. The electronics compartment 14 is
enclosed by a peripheral, closed sealing or joining edge 22.
Outside the electronics compartment 14, the motor mount 13 has
clamping ribs 23 running substantially radially. These ribs are
located substantially on opposite sides of the electronics
compartment 14. Fixing or caulking openings 24 are located at a
number of positions distributed over the circumference of the motor
mount 13.
[0050] Whereas FIG. 4 shows the electronics compartment cover or
housing cover 16 with a view of the inner side thereof, FIG. 5
shows a perspective illustration of the motor mount 13 with the
electronics compartment 14 thereof enclosed by the sealing edge 22,
without convertor electronics system 15. A raised sealing web 25 is
integrally molded on the sealing edge 22 of the electronics
compartment 14 and is likewise closed peripherally, the contour of
the sealing web as well as that of the electronics compartment edge
24 and the shoulder-like contour thereof at the transition to the
sealing web 25 being visible comparatively clearly in FIG. 7.
[0051] In the joined state of the electronics compartment cover 16
and the motor mount 13, the mount-side sealing web 25 engages with
a corresponding sealing groove 26 in the housing cover 15 (FIG. 7).
The dimensions of the mount-side sealing web 25 and of the
cover-side sealing groove 26 are matched to one another in such a
way that a filling gap 27 for a sealing material (not shown)
remains therebetween.
[0052] A number of spacing pawls 28 are integrally formed on the
inner side of the sealing groove 26, specifically on the groove
wall 26a thereof facing the electronics compartment 14, and
protrude into the sealing groove 26. In the joined state, the
mount-side sealing web 25 bears against the spacing pawl 28 at the
accordingly exposed locations. These spacing pawls 28 result in a
reliable centering when the housing cover 16 is fitted onto the
edge 24 of the electronics compartment 14, in such a way that a
correspondingly uniform filling gap 27 for the sealing compound,
which for example becomes adhesive by heating, remains along the
peripherally closed sealing edge 24 of the electronics compartment
14 between the mount-side sealing web 25 and the cover-side sealing
groove 26 in the joined state. In particular, an uninterrupted,
that is to say also pawl-free, filling gap region 27a is produced
on the groove side opposite the spacing pawl 28, that is to say
between the outer-side groove wall 26b and the sealing web 25. The
sealing compound or adhesive compound filled into the filling gap
region thus provides a peripherally practically constant sealing or
adhesive volume for a particularly reliable seal of the electronics
compartment 14 and fixed adhesive join between the housing cover 16
and the motor mount 13.
[0053] At least one fixing or latching clip 29 is integrally formed
on the electronics compartment cover 16 for roughly fixing and/or
roughly positioning. As can be seen from FIG. 4, two fixing clamps
29 that are diametrically opposed where possible are provided. As
can be seen from FIG. 2 and comparatively clearly from FIG. 8, the
fixing clamps 29 are locked with corresponding clamping ribs 23 of
the motor mount 13.
[0054] For this purpose, the respective fixing clamp 29 is formed
in accordance with FIG. 6 in a substantially U-shaped manner with
two clamping branches 29a and 29b, which each carry, at the end, a
detent pawl 29c and 29d respectively. The detent pawls 29c, 29d are
directed inwardly and preferably extend toward one another at the
same height. In the locked state, the two detent pawls 29c and 29d
engage around the corresponding clamping rib 23 of the motor mount
13.
[0055] FIG. 9 shows the stator 6, on which the rotating-field
winding 7 is wound and which is over-molded by the plastic casing
20. In order to connect the stator 6 to the motor mount 13,
caulking nubs 30 raised in the direction of the motor mount 13 are
integrally formed on the plastic casing 20 of the stator 6 and pass
in the joined state through the corresponding caulking or fixing
openings 24 in the motor mount 13. The joined state is illustrated
in FIG. 10. The caulking nubs 30 are then caulked, for example
hot-formed.
[0056] In the joined state, the pairs 31 of winding ends 31a, 31b
of the rotating-field winding 7 preferably protrude in each case in
the same quadrant of the circular stator 6 into the electronics
compartment 14, where they are bent substantially at right angles
in a manner running radially inwardly. Three such pairs 31 of
winding ends 31a, 31b are provided. When joined so as to contact
the convertor electronics system 15, the winding ends 31a, 31b are
preferably connected in a delta connection of the coils 7a forming
the rotating-field winding 7.
[0057] The winding end pairs 31 of the rotating-field winding 7 are
introduced into the electronics compartment 14 via openings 32 in
the motor mount 13 in a manner reliably sealed by sealing elements
33. Each of the sealing elements 33 consists of a two-component
plastic with a comparatively soft sealing component 33a and with a
comparatively hard supporting component 33b formed in one piece
with the comparatively soft sealing component.
[0058] As can be seen comparatively clearly from FIG. 11, the
comparatively soft seal component 33a of the respective sealing
element 33 is formed in the manner of a labyrinth seal with
outer-side beads arranged axially in succession. The comparatively
hard supporting component 33b formed in one piece with the soft
seal component 33a carries integrally molded plug pins 34 on the
base side, that is to say on the underside facing away from the
soft seal component 33a. Here, two such plug pins 34 are provided
per seal element 33.
[0059] As can be seen from FIG. 12, the hard supporting component
33b of the respective sealing element 33 protrudes from the motor
mount 13 on the mount side facing the stator 6 or the
rotating-field winding 7. In the meantime, the soft seal component
33a of the corresponding sealing element 33 sits in a sealing
manner in the mount-side opening 32 in the motor mount 13.
[0060] As can be seen from FIG. 13, the comparatively hard
supporting component 33b of the respective sealing element 33 sits
in the assembled state in a receiving pocket 35 molded into the
plastic casing 20 of the stator 6. Base-side plug openings 36 are
formed in the receiving pockets 35, the corresponding plug pins 34
of the sealing elements 33 plugging into the plug openings.
[0061] As can be seen comparatively clearly from FIGS. 11 and 13, a
sealing sleeve 33c or 33d is molded integrally on the soft seal
component 33a of the respective sealing element 33 for each of the
winding ends 31a and 31b respectively of the winding end pair 31
and encases the respective winding end 31a or 31b respectively in a
sealing manner. In addition, openings 37 for passing the winding
ends 31a, 31b through the respective seal element 33 are formed in
the hard supporting component 33b of the seal element.
[0062] The invention is not limited to the above-described
exemplary embodiments. Rather, other variants of the invention can
also be derived by a person skilled in the art without departing
from the subject of the invention. In particular, all individual
features described in conjunction with the various exemplary
embodiments can be combined differently without departing from the
subject of the invention.
[0063] The sealing concept for the winding ends 31, 31a, 31b of the
rotating-field winding 7 or coils 7a thereof by the sealing
elements 33 is thus already inventive per se and therefore
constitutes its own invention.
[0064] The electric motor 5 in this regard, in particular formed as
a radiator fan motor for a motor vehicle, contains a rotor 8 which
is mounted rotatably with respect to a stator 6, and contains a
motor mount 13 having an electronics compartment 14 for a convertor
electronics system 15 and having openings 32 within the electronics
compartment 14. The winding ends 31, 31a, 31b of a stator-side
rotating-field winding 7 are introduced via sealing elements 33
into the electronics compartment 14. The seal elements 13,
preferably consisting of a two-component plastic, each have a
comparatively soft seal component 33a and a comparatively hard
supporting component 33b, and wherein the respective seal element
33 sits in a sealing manner via the soft seal component 33a
thereof, which is suitably formed as a labyrinth seal, in the
respective opening 32 in the motor mount 13 or electronics
compartment 14.
[0065] In an advantageous embodiment of this electric motor 5 the
stator 6 is over-molded by a plastic casing 20, in which receiving
pockets 35 are molded, in which the hard supporting component 33b
of the respective sealing element 33 sits. The further embodiments
of the sealing elements 33 also apply similarly to the electric
motor 5 according to the invention.
[0066] The joint between the motor mount 13 and the stator 6
over-molded by the plastic casing 20, the joint being provided by
the caulking nubs 30 integrally molded on the plastic casing 20,
also constitutes an independent invention.
[0067] The electric motor 5 in this regard, in particular formed as
a radiator fan motor for a motor vehicle, contains a rotor 8 which
is mounted rotatably with respect to a stator 6, and contains a
motor mount 13. The stator 6 is over-molded by a plastic casing 20,
on which at least one caulking nub, preferably a plurality of
caulking nubs 30, are integrally molded and pass through the
corresponding caulking or fixing openings 24 in the motor mount 13
and can be deformed, preferably can be hot-formed, in order to join
the motor mount 13 and the stator 6.
* * * * *