FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
As amended by the Patents (Amendment) Act, 2005
AND
The Patents Rules, 2003
As amended by the Patents (Amendment) Rules, 2005
COMPLETE SPECIFICATION (See section 10 and rule 13)
TITLE OF THE INVENTION
A testing system for testing direction of rotation of motor
APPLICANTS :
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTOR (S):
Sawant Vijayanand, Mettem Navdeep, Piyada Mumtazul Hassan, of Crompton Greaves Ltd, FHP (M4) Commercial Motors Division, 196-198, Kundaim Industrial Estate, Kundaim, Ponda, Goa - 403115, 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 the Invention:
This invention relates to the field of motors and systems, methods, and apparatus to test motors, thereof.
Particularly, this invention relates to the testing system for testing direction of rotation of motor.
Background of the Invention:
An electric motor converts electrical energy into mechanical energy. Use of motors finds its ways in pumps of all kinds. Many manufacturers develop and sell motors as standalone equipment. The pumps are then assembled with the motor according to client specification.
For its use in a pump, the direction of rotation of an impeller is very important. For the same reason, the direction of rotation of motor is critical in pump applications. The manufacturer needs to test the direction of rotation of every motor before certifying and shipping it.
According to the prior art, there is no known means or apparatus of system for testing the rotation of motor. The motor shaft was manually felt by an operator and the rotation (direction) was ascertained. This inadvertently raises issues relating to human error, besides slowing down the testing process because of human element.
There is a need for a fail-proof and better testing system.

Prior Art:
GB1111368 discloses the concept of devices for ensuring the correct direction of rotation of a small electric synchronous motor by using a ratchet wheel fitted on the rotor shaft and the ratchet arm with pawl is connected by the friction coupling to a disc directly driven by the rotor. However, its use in testing or determining the rotation direction is not disclosed.
Objects of the Invention:
An object of the invention is to efficiently test a motor's direction of rotation.
Another object of the invention is to provide a fail-proof testing system for testing direction of rotation of motor.
Yet another object of the invention is to provide a relatively faster testing system for testing direction of rotation of motor.
Summary of the Invention:
According to this invention, there is provided a testing system for testing direction of rotation of motor, said system comprises:
a. motor to be tested with a first shaft co-axially placed along with a dummy
motor with a second shaft;
b. coupling mechanism adapted to couple said motor with said dummy motor
said coupling ensuring movement of said second shaft along with said first
shaft;

c. ratchet mechanism fitted on said second shaft between said motor and said
dummy motor, said ratchet mechanism adapted to permit movement of the
said motor and first shaft in only a first direction (as required) and further
adapted to engage said second shaft and said dummy motor if movement of
said first shaft is in a second direction (not required); and
d. centrifugal gear fitted within said dummy motor, said centrifugal gear
adapted to engage a centrifugal switch if the motor exceeds a pre-defined
speed of rotation.
Typically, said system includes a governor adapted to define speed of rotation at which said centrifugal switch is engaged.
Typically, said system includes an alarm adapted to be engaged when said predefined speed of rotation is breached.
According to this invention, there is provided a testing method for testing direction of rotation of motor, said method comprises the steps of:
a. co-axially placing a motor to be tested with a first shaft along with a dummy
motor with a second shaft;
b. coupling said motor with said dummy motor, said coupling ensuring
movement of said second shaft along with said first shaft;
c. permitting movement of said motor and first shaft in only a first direction (as
required) and further engaging said second shaft and said dummy motor if
movement of said first shaft is in a second direction (not required); and
d. engaging a centrifugal switch if the motor exceeds a pre-defined speed of
rotation.

Typically, said method includes the step of defining speed of rotation at which said centrifugal switch is engaged.
Typically, said method includes the step of engaging an alarm when said predefined speed of rotation is breached.
Brief Description of the Accompanying Drawings:
The invention will now be described in relation to the accompanying drawings, in which:
Figure 1 illustrates a schematic of the system.
Detailed Description of the Accompanying Drawings:
According to this invention, there is provided a testing system for testing direction of rotation of motor.
Figure 1 illustrates a schematic of the system.
In accordance with an embodiment of this invention, there is provided a motor (M) to be tested and a dummy motor (DM) which co-axially coupled to each. A first shaft (SI) extends from the motor (M) to be coupled to a second shaft (S2) of the dummy motor (DM). The dummy motor (DM) is a powerless motor which will provide for rotation only if the second shaft (S2) rotates.

In accordance with another embodiment of this invention, there is provided a coupling mechanism (CM) to couple said motor (M) to said dummy motor (DM). The coupling ensures that as the first shaft (SI) moves, the second shaft (S2) moves too.
In accordance with yet another embodiment of this invention, there is provided ratchet mechanism (RM) adapted to be fitted on said second shaft (S2) between said motor (M) and said dummy motor (DM). As long as the first shaft (SI) moves in the defined direction, the ratchet mechanism (RM) permits movement of the motor (M) and its shaft (SI) in only one direction (as required). As long as the motor (M) turns the first shaft (SI) in the required direction, the ratchet mechanism (RM) is not engaged, and the first shaft (SI) action does not translate on to the dummy motor (DM), thus not affecting or causing any action on the dummy motor (DM) or the second shaft (S2).
In the event that the first shaft moves in an opposite non-required direction, the ratchet mechanism (RM) is engaged. This moves the second shaft (S2) of the dummy motor (DM), and the dummy motor (DM) rotates.
In accordance with still another embodiment of this invention, there is provided a centrifugal gear (CG) fitted within said dummy motor (DM), said centrifugal gear (CG) adapted to engage a centrifugal switch (CFS) if the motor exceeds a predefined speed of rotation. A governor may be placed which raises an alarm (A) if the pre-defined speed of rotation (defined by the governor) is breached. The alarm may be a visual alarm or a sound alarm or both.

This ensures a faster, more secure system and method of testing motor rotation without human intervention.
While this detailed description has disclosed certain specific embodiments of the present invention for illustrative purposes, various modifications will be apparent to those skilled in the art which do not constitute departures from the spirit and scope of the invention as defined in the following claims, and it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

We claim,
1. A testing system for testing direction of rotation of motor, said system comprising:
a. motor to be tested with a first shaft co-axially placed along with a dummy
motor with a second shaft;
b. coupling mechanism adapted to couple said motor with said dummy motor
said coupling ensuring movement of said second shaft along with said first
shaft;
c. ratchet mechanism fitted on said second shaft between said motor and said
dummy motor, said ratchet mechanism adapted to permit movement of the
said motor and first shaft in only a first direction (as required) and further
adapted to engage said second shaft and said dummy motor if movement of
said first shaft is in a second direction (not required); and
d. centrifugal gear fitted within said dummy motor, said centrifugal gear
adapted to engage a centrifugal switch if the motor exceeds a pre-defined
speed of rotation.
2. A testing system as claimed in claim 1 wherein, said system includes a governor adapted to define speed of rotation at which said centrifugal switch is engaged.
3. A testing system as claimed in claim 1 wherein, said system includes an alarm adapted to be engaged when said pre-defined speed of rotation is breached.

4. A testing method for testing direction of rotation of motor, said method
comprising:
a. co-axially placing a motor to be tested with a first shaft along with a dummy
motor with a second shaft;
b. coupling said motor with said dummy motor, said coupling ensuring
movement of said second shaft along with said first shaft;
c. permitting movement of said motor and first shaft in only a first direction (as
required) and further engaging said second shaft and said dummy motor if
movement of said first shaft is in a second direction (not required); and
d. engaging a centrifugal switch if the motor exceeds a pre-defined speed of
rotation.
5. A testing method as claimed in claim 4 wherein, said method includes the step of defining speed of rotation at which said centrifugal switch is engaged.
6. A testing method as claimed in claim 4 wherein, said method includes the step of engaging an alarm when said pre-defined speed of rotation is breached.