The present invention relates to AC ceiling fan motor assembly and in particular to
improvement in AC ceiling fan motor assembly directed to make it simple and cost
effective and also improve on aesthetic appearance of the ceiling fan.
Presently it is well known that AC ceiling fan motors comprising of the rotor and the
stator are assembled in a housing comprising of a top cover and a bottom cover. In
particular, it is known to fix a circular shaped rotor with respect to said top and bottom
cover internally with the stator concentrically located in said rotor. Importantly, for the
purpose of such fixing of the rotor with respect to said top and bottom cover, the said top
and bottom covers are specifically^royjdedjMth integrally formed rings. The rotor which
is usually in the form of a circular ring is fitted against the internal walls of the integral
ring of said top and bottom cover and held in position by securing of the top and bottom
covers. In such existing systems, the rotor is cast as "squirrel cage" rotor with formation
of conductors and end ring. The known assembly of AC ceiling fan motor thus basically
consists of the circular rotor internally supported with respect to integrally formed rings in
said top and bottom cover with stator supported with respect to a spindle and bearing
means provided concentrically and within said circular rotor, the top and bottom covers
being screw fixed to complete the housing of the motor.
Importantly, it would be evident from the above that the conventional assembling of
motor of AC ceiling fan essentially require the integrally formed internal rings in said top
and bottom cover to support the rotor. Moreover, due to such provision of inner rings in
the cover the same lead to increase in weight and also to cost. Moreover, in such
conventional assembling of AC ceiling fan motor with the disposition of the rotor with
respect to said internal end rings of the top and bottom covers resulted in technical
problems, in that the transit impact was transmitted to the rotor cage which is relatively
non-rigid and caused distortion of the rotor leading to friction between the rotor and
stator. Also, the known assembly of the fan motor especially the rotor with respect to end
rings after assembling of the rotor and the stator resulted in an uneven gap there
between the top and bottom covers which also affected the aesthetic look of the ceiling
fan. Added to the above, conventional assembly of such AC ceiling fan motor due to the
need for providing the internal rings to support the rotor had limitations in terms of use of
materials for such top and bottom cover. The covers can thus be obtained only of cast
iron/aluminium and it was not possible to have such covers of sheet material.
Importantly, added to the above limitations of conventional construction, a further
problem due to the essential feature of provision of the rotor supported by the internal
rings was in terms of necessity of providing the rotor dimensions matching with the
corresponding dimensions of the inner ring of the top and bottom covers supporting said
rotor. Thus the rotor necessarily had to be of specific dimensions matching that of the
ring of the top and bottom cover. All such problems/drawbacks of conventional AC
ceiling fan motor assembly resulted in limitations of manufacturing of such conventional
AC ceiling fan motors and their assembling.
OBJECT OF THE INVENTION
It is thus the basic object of the present invention to provide for an improved assembly of
AC ceiling fan motor which would avoid the above discussed problems/shortcomings of
the conventional art of assembling of the rotor in AC ceiling fans.
Another object of the present invention is to provide for an improved assembly of AC
ceiling fan motor which would avoid the problems of deformation of the rotor and related
problems of the known art.
Another object of the present invention is to provide for an improved assembly of AC
ceiling fan which would be simple to manufacture and facilitate achieving lower rejection
rates and/or transit/transportation losses and would also be cost-effective.
Yet another object of the present invention is to provide for a an improved assembly of
AC ceiling fan which would have better aesthetic appeal and especially will not have any
gap there between the top and the bottom cover.
Yet another object of the present invention is to provide for an improved assembly of AC
ceiling fan motor which would provide for flexibility in desired selection of material for the
top and/or bottom covers making the product simple and cost effective to obtain.
Yet further object of the present invention is to provide for an improved assembly for AC
ceiling fan motor wherein the dimensions of the rotor and assembly cover can be
selected as per the functional requirements and aesthetic appeal.
SUMMARY OF THE INVENTION
Thus according to the present invention there is provided an improved assembly for AC
ceiling fan motor comprising a housing obtained of a top and a bottom cover for
accommodating the rotor and stator therein, said stator being suspended from spindle
and bearing means concentrically within said rotor, said rotor provided with radially
outwardly extending arms adapted to support the same internally and secure with
respect to said top and/or bottom covers.
In accordance with a preferred aspect of the present invention the improved assembly
for AC ceiling fan motor comprises of said top and bottom cover providing for a housing
with the vertical peripheral edge portions of said top and bottom cover defining the sides
of said housing free of any gap there between the top and bottom covers, said rotor
circular in shape supported with respect to plurality of spaced apart extended arms
resting with respect to corresponding sections in said vertically disposed internal edges
of said top and bottom cover, the stator provided concentrically within said rotor and
suspended with respect to a spindle and bearing through an opening in the top cover,
said extended arms of said rotor fitted with respect to the bottom and/or top cover and
said top cover fitted with respect to said bottom cover to complete the housing.
Preferably the rotor at the extended arms portion is secured with respect to said bottom
cover by screw means and said top cover is also secured with respect to said bottom
cover also by screw means.
Also the rotor is provided with at least three to six of such flanged extended arms
adapted to support the same with respect to corresponding matching sections in the
internal vertical side edges of the bottom cover. The respective flanged arm sections
being provided with holes to facilitate the screw fixing of the rotor with respect to the
bottom cover.
It is important to mention that unlike the conventional top and bottom covers for
supporting such motors in AC ceiling fans, the top and bottom cover of the housing in
accordance with the assembly of the invention does not require the internal rings to
support the rotor and the construction is thus simple and cost effective.
In accordance with yet further aspect of the present invention the improved assembly of
AC ceiling fan motor provides for variation in the material of the covers and can comprise
of a top and a bottom cover obtained of functional sheet metal each having a vertically
disposed peripheral edge portion said vertical side edges of said top and bottom cover
match with one another to constitute a substantially vertical side portion of the assembly
said vertical internal face of said side wall of the bottom cover having jstepped
configuration to support the rotor arm, the stator disposed centrally in said rotor with said
rotor arm secured to said top/bottom covers to complete the assembly.
Importantly, in accordance with the above assembly of AC ceiling fan motor the same
provides for obtaining the same in functional sheet metal which avoids the requirement
of complex machining of the covers and thereby reduces manufacturing defects and
facilitates easy and convenient assembly of the unit. Also such an assembly facilitates
positive screwing of both the top and bottom covers to the rotor thereby providing better
stability to the assembly.
Also most importantly, added to the above in the assembly of the invention the extended
arm of the rotor takes the stress and saves the rotor cage from deformation and
consequential replacement of components.
Details of the invention its objects and advantages will now be explained in greater detail
in relation to non-limiting exemplary embodiments as per the accompanying figures
wherein -
Figure 1 is a sectional illustration of a conventional assembly for AC ceiling fan motor.
Figure 2A is a sectional illustration of the rotor with a squirrel cage formation of
conductors and end ring as provided in conventional assembly AC fan motors.
Figure 3A is a top plan view with the top cover removed of the conventional assembly for
AC ceiling fan motor.
Figure 4 is a sectional illustration of the construction of the top cover of the conventional
assembly for AC ceiling fan motor.
Figure 4A is a sectional view of the bottom cover of the construction of conventional
assembly for AC ceiling fan motor.
Figure 5 is a sectional illustration of the improved modified assembly of AC ceiling fan
motor in accordance with the present invention.
Figure 6A is an illustration of the modified rotor used in the improved assembly of AC
ceiling fan motor of the invention.
Fig. 7 is a sectional illustration of the modified top cover in accordance with the assembly
of the present invention.
Figure 7A is a sectional illustration of the modified bottom cover in accordance with the
assembly of the present invention.
Figure 8 is an illustration of the rotor and bottom cover sub-assembly with the top cover
removed of the assembly of the present invention.
Figure 8A is a sectional view of the modified rotor and the modified bottom cover of the
assembly in accordance with the present invention.
Fig. 9 is a sectional illustration of another embodiment of the improved assembly for AC
fan motor of the invention obtained of sheet metal top and aluminium bottom cover.
Fig. 10 is a sectional illustration of yet another embodiment of the improved assembly in
accordance with the present invention with sheet metal top cover and sheet metal
bottom cover.
Fig. 11 is a sectional illustration of the modified rotor supported with respect to the
modified bottom cover in accordance with the assembly of the present invention as per
figure 10 above.
Fig. 12 is a sectional illustration of another embodiment of the improved assembly for AC
fan motor of the invention obtained of cast-iron top and bottom covers.
Fig.13 is a sectional illustration of another embodiment of the improved assembly for AC
fan motor of the invention obtained of cast-iron top and sheet metal bottom covers.
Fig. 14 is a sectional illustration of yet another embodiment of the improved assembly for
AC fan motor of the invention obtained of sheet metal top and cast iron bottom covers.
Reference is first invited to fig. 1, which illustrates a sectional view of the conventional
assembly of AC ceiling fan motor. As illustrated in said figure, in such a construction the
rotor (RO) and the stator (ST) are housed within the housing obtained of a top cover
(TC) and a bottom cover (BC). The top cover (TC) as shown in said figure is comprised
of a surface portion (TSP) having a stepped configuration with a central opening for
introducing of the spindle and supported bearings holding the stator (ST) concentric with
respect to the rotor (Ro|. The top cover is shown essentially provided with an internally
extending ring (RGt) and side portion (SPT) which are substantially vertically disposed
spaced away from said ring. The bottom cover (BC) also has a surface portion (BSP)
and essentially provided with internal ring portion (RG2) which is adapted to support the
circular rotor along with the ring (RG1) of the top cover. The portion in the form of
cylindrical portion is provided to accommodate the bush (BM) which guides and
maintains the shaft in position. Also, likewise that the top, the bottom cover has
substantially vertical side portions (SPB) which correspond and match with the vertical
portion of the top cover (SPT).
The presently available assembly for AC ceiling fan motor thus essentially requires the
internal rings (RG1 & RG2) of top and bottom covers to support the rotor. After
assembling of the rotor with respect to the rings the top and bottom covers are screw
fitted with respect to one another.
Due to the rings and disposition of the rotor there between even after screwing of the top
and bottom covers in said conventional assembling an uneven gap (GP) was generated
there between the top and bottom covers which affected the aesthetic look of the
assembly.
Moreover, this provision of the ring portion (RG1 & RG2) in the top and bottom covers
made the process of manufacturing cost-extensive.
Importantly also, since the rotors are basically supported with respect to said ring
portions, during operation of the motor stress and strains are exerted on the rotor which
occasionally resulted in deformation of the rotor and consequently functional problems
and need for reassembly of motor or replacement of the housing/rotor. This made the
use of such conventional assembly cumbersome and cost extensive.
Figure 2A which illustrates a sectional view the construction of conventional rotors used
in the conventional assembly of AC ceiling fans. As explained in relation to said fig.1
such a rotor is basically of circular configuration having the squirrel cage with formation
of conductors and end rings. It is possible in accordance with a further aspect of the
assembly in accordance with the conventional art as shown in Fig. 3A that the bottom
cover and the top covers instead of a continuous ring portion (RG1/RG2) is provided with
spaced flanged portions (FP) which support the rotor instead of a continuous ring
portion. Needless to mention that the problems encountered in case of a continuously
ringed housing portion extend also to such spaced apart flanged support in accordance
with this embodiment of the known assembly.
Reference is now invited to figure 4 which is an illustration of the conventional top cover
of the housing. As explained above in such conventional top cover the ring portion (RG1)
is provided to accommodate and support the said rotor with respect to said bottom cover
ring portion (RG2) as illustrated in Fig. 4AReference is now invited to figure 5 which illustrates the improved assembly for AC
ceiling fan motor in accordance with the present invention. As illustrated in said modified
assembly, the circular rotor (RO) is provided with extending arms_{ER) spaced apart
which are adapted to rest with respect to corresponding sections of the peripheral
internal vertical side edges (BSE) of the bottom cover (BC). Once supported the rotor
(RO) is screw fitted with respect to the bottom cover as also shown in the figure. For the
purpose, the extending arm (ER) of the rotor is also provided with holes to provide for
screw fitting (SW1) of the same with respect to the bottom cover. The top j»ver (TC) is
provided with the corresponding peripheral downwardly vertically extending side (TSE)
which aligns and matches with the vertical side of the bottom cover to provide for a
compact housing. After assembling of the stator with bearing and supporting
components the top cover is placed and secured with respect to the bottom cover by
screw means (SW2). Notably in such modified construction by way of the modification in
the rotor construction in the form of the extended arms, the rotor is supported internally
at the peripheral side edges of said top and bottom covers especially by resting with
respect to a stepped portion (SP) of the said bottom cover (BC). Such a modified
support for the rotor avoids need for the internal end rings for the rotor in the top and
bottom covers to support the rotor as in the conventional assembly. Importantly, by way
of such modified construction it is now also possible to avoid the stress of the rotor cage
and thereby the rotor arms take up the stress and the rotor cage does not deform.
Importantly, there is no gap between the top and the bottom cover after assembling
which provide better aesthetic appeal of the housing for the ceiling fan. Added to the
above, the elimination of the ring lead to reduction in weight and consequently cost
reduction as well.
Reference is now invited to fig. 6A which illustrates in sectional view the modified rotor
for use in the assembly of the invention. As illustrated in said figure, the circular rotor is
specifically provided with spaced apart arms (ER) which are supported internally in the
stepped portion (SP) and edge portion (BSE) of bottom cover (BC) and held there
between the top and bottom covers. Also to facilitate the screwing of the rotor with
respect to the bottom cover (BC) hole (HO) is provided in the arm through which screws
penetrate to screw fit with respect to the bottom cover.
Reference in now invited to figure 7 which illustrates a sectional view of the modified
construction of the top cover (TC) in accordance with the present invention. As shown
in said figure, the top cover is simple in construction and has a surface portion (SP) with
a central opening (CO) for introducing the shaft holding the stator. At the side the cover
is provided with the flanged extension (TSE). As also illustrated in figure 7A, the bottom
cover also does not involve the provision of the ring as that of the conventional assembly
and thereby simplifies the process of machining to obtain the top and bottom covers and
consequently cost reduction.
Reference is now invited to the illustration in figures 8 and 8A which illustrate in greater
detail, the assembling of the modified rotor (RO) with respect to the bottom cover (BC).
As shown in said figure, the modified rotor (RO) with the extending arm (ER) is with
respect to the internal peripheral side edge portion (BSE) of the bottom cover (BC). Also,
as shown in the figure the bottom cover (BC) also includes the means for screw fitting
the rotor with respect to the bottom cover (BC).
Preferably in accordance with a preferred embodiment of the assembly of the invention,
the rotor is cast with six projected arms in addition to the usual "squirrel cage" formation
of conductors and end rings. The bottom cover has Jugs on which the rotor rests/ The
top and bottom covers do not have the inner ring. The rotor rests on the lugs of the
bottom cover and is located in the inner diameter of the cover. Holes are drilled in the
projected arms of the rotor and the rotor is screwed down in the bottom cover. The top
cover subassembly with bearings, stator etc. is lowered on the bottom cover
subassembly. The top cover rests on the bottom cover face and is screwed down.
There is no gap between the top and bottom covers.
Reference is now invited to another embodiment of the assembly of the invention
wherein a functional sheet metal top cover (STC) and an aluminium bottom cover (ABC)
is used.
As shown in figure 9, while the basic construction of the rotor and the top/bottom covers
remain the same as in fig. 5, the illustration in fig. 9 go to illustrate that due to simplicity
in the construction of the assembly of the invention, it is possible to have a functional
sheet metal (FSM) top cover and an aluminium bottom cover (ABC) construction which
was not possible under the conventional art.
Reference is now invited to figure 10 which is yet another alternative embodiment of the
housing in accordance with the present invention involving sheet metal top and sheet
metal bottom cover. Importantly, in such embodiment the rotor is provided with
extending arms (ER) which is supported with respect to the flanged stepped portion (SP)
of the bottom cover.
In this embodiment of sheet metal top and bottom cover, unlike the other embodiments
of the assembly of the invention discussed above, rotor is screw fitted to the top cover at
one end and to the bottom cover at the other end of the extended arm portions. The
___ - - details of the rotor supported with respect to the bottom cover (BC) is shown in figure 11.
it would apparent from the above that the provisions of such sheet metal top and bottom
cover avoids complex machining and thereby avoids manufacturing rejections/losses.
The possible use of such functional sheet metal too and bottom cover is directed to
facilitate easy and simple manufacture and assembling of the rotor.
In this embodiment, the rotor is cast with six projected arms in addition to the usual
"aauirrel caae" formation of conductors and end rings. The rotor rests on the bottom
cover and is located in the inner diameter of the sheet metal cover. The rotor is screwed
on the bottom cover and also the top cover. The top cover subassembly with bearings
etc. is lowered on the bottom cover. The top cover rests on the bottom cover and the top
cover is screwed onto the lugs of the rotor.
It is clarified that while in the above exemplary illustrations the figures show construction
using a ball bearing in the top cover and a bush bearing in the bottom cover. However,
the construction islriso valid using a ball bearing in the bottom cover in place of a bush
bearing.
Reference is now invited to Fig. 12 which shows another embodiment of the improved
assembly of AC ceiling fan motor of the invention wherein the top and bottom covers are
both obtained of cast iron. In accordance with such an embodiment while the basic
features of the rotor (RO) with the extended arm (ER) is same as that of the earlier
discussed embodiments, the rotor arm is supported by way of the internal side edges of
bottom cover fBSE) and the top cover (TSE). Importantly, in such an embodiment while
the provision of internal rings to support the rotor is avoided, unlike the other
embodiments of the assembly of the invention discussed above, upon assembling of the
top and bottom covers with the rotor and stator inside a gap (GP) exists there between
the top and the bottom covers. Also, in such an embodiment, the rotor is securedly held
with respect to the top and the bottom covers and there is no need for additional
screwing of the rotor with respect to either top or the bottom cover. Only the top cover is
screwed to the bottom cover by a screwing means (SW2) as also illustrated in the figure.
Additionally, the rotor can be screwed to the bottom cover (as clearly illustrated in the
embodiment of Fig. 5) thereby eliminating the gap (GP)).
Reference is now invited to figure 13 which illustrates yet further embodiment of the
assembly of the invention comprising of a cast iron top and sheet metal bottom cove/.
According to this embodiment also the rotor (RO) is having an extended arm (ER) which
is supported with respect to the stepped side edge portion of the bottom cover (BSE) and
the top cover side edge (TSE). In this embodiment, the top side edge of the top cover
and the bottom side edge of the bottom cover define a compact housing without any
gaps therebetween the covers. As further illustrated in said figure, the rotor (RO) is
screwed to the top cover by screw means (SWl) at one end and to the bottom cover by
screw (SW2).
Reference is now invited to accompanying figure 14 which illustrates yet further
embodiment of the improved assembly of AC ceiling fan in accordance with the present
invention. In accordance with this embodiment, the top cover (TC) is obtained of sheet
metal while the bottom cover (BC) is obtained of cast iron. Importantly, in this
embodiment, the rotor arm (ER) is provided with a vertically upwardly extending edge
portion (EP) with a stepped configuration (SC) at the bottom thereof which matches with
corresponding internal side edge of the bottom cover (BSE). Such a modified
embodiment also provides for housing of the rotor with respect to the top and bottom
covers without requirement of any screwing to the top/bottom covers. The top cover only
is screwed with respect to the bottom cover by screwing means (SW2). Additionally, the
rotor can be screwed to the bottom cover (as clearly illustrated in the embodiment of Fig.
5) thereby eliminating the gap (GP)).
It would be evident from the above that the improved assembly in accordance with the
invention achieves the following advantages:
i) In the new construction the projected arms of the rotor take up the stress and the
rotor cage does not deform. The advantages are
a). Lower rejections
b). Lower transit/transportation losses.
There is no gap between covers to give a better aesthetic appeal.
The elimination of the inner ring in the covers leads to a reduction in weight in the
covers and also to the cost.
There is a cost reduction of material in the top and bottom covers due to
elimination of the inner ring, which was used for locating the rotor.
The construction has the added flexibility of using different types of material for
the covers
a) Cast iron top cover & cast iron bottom cover;
b) Cast iron top cover and aluminium bottom cover;
c) Aluminium top cover and aluminium bottom cover ;
d) Functional sheet metal top cover and aluminium bottom cover;
e) Functional sheet metal top cover and sheet metal bottom cover;
f) Cast Iron top cover and functional sheet metal bottom cover; and
g) Functional sheet metal top cover and cast iron bottom cover.
This elimination of the inner ring in the covers does not require the outside
diameter to match the rotor diameter. This allows for different shapes and sizes
of the cover as desired for aesthetic appeal/design.
WE CLAIM :
1. An improved assembly for AC ceiling fan motor comprising a housing obtained of a
top and a bottom cover for accommodating the rotor and stator therein, said stator
being suspended from spindle and bearing means concentrically within said rotor,
said rotor circular in shape supported by means of plurality of spaced apart extended
arms resting with respect to corresponding sections in vertically disposed internal
side edges of said top and bottojm_cover, the stator provided concentrically therein
said rotor and suspended with respect to said spindle and bearing through an
opening in the top cover, said extended arm of said rotor fitted with respect to the
bottom and/or top cover and said top cover fitted with respect to said bottom cover to
complete the housing.
2. An improved assembly for AC ceiling fan motor as claimed in claim 1 comprising said
top and bottom cover providing for a housing with the vertical peripheral edge
portions of said top and bottom cover defining the sides of said housing free of any
gap there between the top and bottom covers.
3. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 or 2
wherein the rotor at the extended arms portion is secured with respect to said bottom
cover by screw means and said top cover is also secured with respect to said bottom
cover also by screw means.
4. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to 3
wherein the rotor is provided with preferably three to six of such spaced flanged
extended arms adapted to support the same with respect to corresponding matching
sections in the internal vertical side edges of the bottom cover.
5. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to 4
wherein the covers comprise of a top and a bottom cover obtained of functional
sheet metal each having a vertically disposed peripheral edge portion said vertical
side edges of said top and bottom cover match with one another to constitute a
substantially vertical side portion of the assembly said vertical internal face of said
side wail of the bottom cover having stepped configuration to support the rotor arm,
said rotor arm secured to said top/bottom covers to complete the assembly.
6. An improved assembly for AC ceiling fan motor as darned in anyone of claims 1 to 5
comprising positive screwing of both the top and bottom covers to the rotor thereby
providing better stability to the assemWy.
7. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to 6
wherein said top cover is comprised of a surface portion having a stepped
configuration with a central opening for introducing the spindle and supported
bearings holding the stator concentric with respect to the rotor.
8. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to 7
wherein said circular rotor is provided with spaced emended arms which are adapted
to rest with respect to the corresponding sections of the peripheral internal vertical
side edges of the bottom cover.
9. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to
8 wherein said extended arms of the rotor is provided with holes to provide for screw
fitting of the holes with respect to the bottom and/or top cover.
/10. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to 9
wherein said top cover is provided with corresponding peripheral downwardly
vertically extending sides which aligns and matches with the vertical side of the
bottom cover to provide for compact dosed side wall of said housing.
11. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to
10 wherein said bottom cover is provided with lugs on which the rotor rests which is
in the inner diameter of said cover.
12. An improved assembly for AC ceiling fan motor as claimed in anyone of claims 1 to
11 wherein said covers are obtained of anyone of the selected combination
hereunder:
a) cast iron top cover and cast iron bottom cover ;
b) cast iron top cover and aluminium bottom cover
c) aluminium top cover and aluminium bottom cover;
d) functional sheet metal top cover and aluminium bottom cover;
d) functional sheet metal top cover and aluminium bottom cover;
e) functional sheet metal top cover and sheet metal bottom cover;
f) cast iron top and functional sheet metal bottom covers; and
g) functional sheet metal top and cast iron bottom covers.
13. An improved assembly as claimed in claim 12 comprising of a cast iron top and cast
iron bottom and wherein said rotor is supported and secured at said rotor arm with
respect to the top and bottom cover side edges, said top and bottom covers screw
fitted with respect to one another with a circular gap therebetween Jhe adjasent
edges of said top and bottom covers.
14. An improved assembly as claimed in claim 12 comprising of a cast iron top and cast
iron bottom said rotor supported and secured at said rotor arm with respect to the
top and bottom cover side edges, said top and bottom covers screw fitted with
respect to one another and wherein said rotor is further screwed to said bottom cover
to thereby provide a compact housing free of any gap.
15. An improved assembly as claimed in claim 12 comprising of a cast iron top cover and
sheet metal bottom cover and wherein said rotor is supported and securedly held at
the rotor arm with respect to the internal side edges of the top and bottom covers the
rotor screwed to said top and bottom covers to complete the housing.
16. An improved as claimed in claim 12 comprising of sheet metal top cover and cast
iron bottom cover and wherein said rotor is supported and secured at the rotor arm
having its edge portion adjacent to the internal side edges of said top and bottom
cover adapted such as to be securedly supported by said top and bottom cover side
edges with said top cover screwed onto the bottom cover and wherein said rotor is
further screwed to said bottom cover to thereby provide a compact housing free of
any gap.
17. An improved assembly as claimed in claim 12 comprising of sheet metal top cover
and cast iron bottom cover and wherein said rotor is supported and secured at the
rotor arm having its edge portion adjacent to the internal side edges of said top and
bottom covers adapted such as to be securedly supported by said top and bottom
cover side edges with said top cover screwed onto the bottom cover.

An AC ceiling fan motor assembly and in particular improvement in AC ceiling fan
motor assembly comprising a housing obtained of a top and a bottom cover for
accommodating the rotor and stator therein wherein the said rotor is provided with
radially outwardly extending arms adapted to support the same internally secured
with respect to said top and/or bottom cover side edges. Such a modified rotor and
housing serves to avoid the provision of internal rings in the top/bottom covers
usually used to support the rotor in conventional AC ceiling fan housings. The would
make assembling/manufacture of AC fans simple and cost effective and also improve
on aesthetic appearance of the ceiling fan. Importantly, the modified housing would
enable obtaining of the housing, top and bottom covers of AC ceiling fan motors from a
selective variety of materials including case iron, aluminium and also functional sheet
metal.