FORM 2
THE PATENTS ACT, 1970
(39 OF 1970)
As amended by the Patents (Amendment) Act, 2005
&
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2006
COMPLETE SPECIFICATION
(See section 10 and rule 13)
TITLE OF THE INVENTION
A Device to check an Air Delivery of Ceiling Fan
APPLICANTS
Crompton Greaves Limited, CG Mouse. Dr Annie Besant Road, Worli. Mumbai 400 030, Maharashtra, India, an Indian Company
lNVENTOR(S)
Kamble Deepak Gajanan of Crompton Greaves Ltd., of Engineering Department, CG Global R&D Centre, Kanjur (E), Mumbai 400042, Maharashtra. India, an Indian National
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention and the. manner in which it is to be performed.

FIELD OF INVENTION
This invention relates to the field of fans and fan motors.
Particularly, this invention relates to a device to check an air delivery of a ceiling fan
BACKGROUND OF INVENTION
The conventional method to design a ceiling fan with specified wattage and specified air delivery involves first designing a motor considering the blade load and then designing a blade to achieve the specified air delivery.
The conventional method to check air delivery of a ceiling fan is, firstly. by designing a motor considering the fan blade load and then actually developing the blades in relation to it. Then, the motor and blade assembly are to be checked for air delivery in an air delivery (AD) chamber. Readings of air flow / velocity are noted and used for inferring the motor and mount design.
There are two things that may happen in this methodology; either the AD is obtained or it is not. But, it.has been observed that 95% of the times, AD is not obtained.
Hence, a further and newer design will have to be developed using another blade set and repeat the activity. Or there are much more chances to re-design the motor.

This design and development of ceiling fan lakes lot of time, energy.
Sometimes it becomes a very tedious process because it involves many designs and re-designs and proto typing in order to achieve a specified rated factor of the ceiling fan. Also, sometimes it becomes necessary to compromise on certain values as it takes months together to finalize.
OBJECTS OF INVENTION
An object of the invention is to provide a device to check an Air Delivery of ceiling fan which is simple in construction and comprises three numbers of components so as to reduce the material cost and manufacturing cost thereof.
Another object of the invention is to provide a device to check an Air Delivery of ceiling fan which gives us accurate values of the air delivery in less time.
SUMMARY OF THE INVENTION
According to this invention, there is provided a device to check an Air Delivery of ceiling fan, said device comprises:
- hub with a pre-defined number of slots adapted to receive corresponding pre-defined number of fan blades;
- motor adapted to rotate said hub and hence, rotate said received fan blades, said motor including a speed controller adapted to control speed of said motor, in relation to desired output; and

- mounting bracket adapted to provide mounting support for said motor atop said hub.
Typically, said device includes a parameter lasting means adapted to receive output parameters of said fan.
Typically, said device includes feedback means adapted to receive feedback from output to said controller.
Typically, said device includes a secondary controller means adapted to vary speed controller in relation to received feedback in order to achieve
rated output.
Typically, said secondary controller includes a receiving means adapted to receive preset parameters relating to motor, weight, desired output characteristics in terms of air delivery and power consumed.
Typically, said secondary controller includes a suggestion means adapted to suggest a suitable motor rating for a particular fan load in relation to
received output.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
The invention will now be described in relatk)n to the accompanying drawings, in which:
Figure 1 illustrates an isometric top view of the mounted (fan) motor and (fan) blades on a hub and mounting bracket;

Figure 2 illustrates a top view of Figure 1;
Figure 3 illustrates a typical section view of Figure 1;
Figure 4 illustrates an exploded view of Figure 1;
Figure 5 illustrates a device with hub for testing a 4-blade fan;
Figure 6 illustrates a device with hub for testing a 5-blade fan;
Figure 7 illustrates a hub for 3-blade mounting;
Figure 8 illustrates a hub for 4-blade mounting; and
Figure 9 illustrates a hub for 5-blade mounting.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
According to the invention there is provided a device to check an Air Delivery of ceiling fan comprising a motor mounting bracket, motor with speed controller and a blade mounting hub.
Figure 1 illustrates an isometric top view of the mounted (fan) motor and (fan) blades on a hub and mounting bracket.
Figure 2 illustrates a top view of Figure 1.
Figure 3 illustrates a typical section view of Figure 1.

Figure 4 illustrates an exploded view of Figure 1.
Figure 5 illustrates a device with hub for testing a 4-blade fan, and Figure 6 illustrates a device with hub for testing a 5-blade fan.
Figure 7 illustrates a hub for 3-blade mounting. Figure 8 illustrates a hub for 4-blade mounting, and Figure 9 illustrates a hub for 5-blade mounting.
In accordance with an embodiment of this invention, said motor mounting bracket (12) is made up of two MS plate welded together in right angle to form a bracket. This holds on to the fan motor.
In accordance to the invention, said motor (14) with speed controller comprises a motor with controller and can be rotated in variable speed. The speed may be varied continuously or at discrete time intervals to measure parameters of testing including speed of air delivery, load on the fan. energy consumption, optimum energy parameters, and the like parameters, in order to rate a fan and to provide a consistent and good quality fan with defined parameters of use.
In accordance to the invention, said blade mounting hub (16) comprises a hub which includes provisions or slots (24) to fix a defined number of blades (18), whose air delivery to be checked. A plurality of hubs are typically developed to include a plurality of number of blades with respect to a single motor (fan).
Reference numeral 20 refers to a hub locking screw adapted to lock hub to a motor.

Motor with motor mounting bracket fixed to the ceiling of Air Delivery Chamber, Hub fixed to the motor shaft and locked by locking screw to the motor shaft.
This test rig is very useful the determined the air delivery of a blade without having its motor and it gives us speed verses AD characteristics. As the motor having variable speed control, we can set any speed and check the Air Delivery at particular motor speed.
There may also be provided an automated feedback means adapted to provide a feedback of parameters to the speed controller directly or to the speed controller via a secondary controller. The secondary controller may be adapted to vary the speed of the motor in accordance with the load until it achieves optimum rated parameters. These optimum rated parameters need to be defined and fed to the secondary controller. Said secondary controller may include a suggestion means adapted to suggest a suitable motor rating for a particular fan load in relation to received output. Preferably, the suggestion means is based on Artificial Neural Networks.

We claim,
1. A device to check an Air Delivery of ceiling fan. said device comprising:
- hub with a pre-defined number of slots adapted to receive
corresponding pre-defined number of fan blades;
- motor adapted to rotate said hub and hence, rotate said received fan blades, said motor including a speed controller adapted to control speed of said motor, in relation to desired output; and
- mounting bracket adapted to provide mounting support for said motor atop said hub.

2. A device as claimed in claim 1 wherein, said device includes a parameter testing means adapted to receive output parameters of said fan.
3. A device as claimed in claim 1 wherein, said device includes feedback means adapted to receive feedback from output to said controller.
4. A device as claimed in claim 1 wherein, said device includes a secondary controller means adapted to vary speed controller in relation to received feedback in order to achieve rated output.
5. A device as claimed in claim 4 wherein, said secondary controller includes a receiving means adapted to receive preset parameters relating to motor, weight desired output characteristics in terms of air delivery and power consumed.

6. A device as claimed in claim 4 wherein, said secondary controller includes a suggestion means adapted to suggest a suitable motor rating for a particular fan load in relation to received output.