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
PROVISIONAL SPECIFICATION
(See section 10 and ruJe 13)


TITLE OF THE INVENTION
A stator pulling device for BLDC motor and method of pulling the same
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Bhimrao Pundlik Jadhav of Crompton Greaves Ltd , SPC/Engg Lab., CG Global R&D Centre, Kanjur (E), Mumbai 400042, Maharashtra, India, Indian National
PREAMBLE TO THE DESCRIPTION
The following specification describes the invention


This invention relates to a stator pulling device for BLDC motor and method of pulling the same.
In Prior art, there is no such device to pull out a stator assembly from rotor housing of BLDC Motor. It was removed manually. Due to magnetic flux of the rotor it was very difficult to remove the stator assembly as it attracts towards the magnetic rotor.
Conventional method needed a highly skilled labor and processing time is also higher to remove a stator assembly from rotor housing. Also there are high no of rejection of stators due to damage in stator winding and the damaged stator assembly will have to re-wind again. This also consume time, cost.
In US6401326 Patent discloses the movable hoisting unit which contains frame and gripping device to hold the stator laminated core for mounting stator coils, but its attached with press machine to press/assemble the coil onto the stator laminated core and very complex structure. In JP7068344 patent discloses the Jig with two arm members for lifting the cylindrical body such as frame for casting which are different from the proposed invention.
An object of the invention is to provide a stator pulling device for BLDC motor and method of pulling the same to remove the stator assembly from rotor housing of a BLDC motor to save manpower cost and increase the productivity
2

An object of the invention is to provide a stator pulling device for BLDC motor and method of pulling the same which takes comparatively very less time.
An object of the invention is to provide a stator pulling device for BLDC motor and method of pulling the same which prevent damage of stator assembly.
An object of the invention is to provide a simple process to remove the stator assembly from rotor housing of a BLDC motor.
According to the invention there is provided a stator pulling device for BLDC motor and method of pulling the same which comprising a handle assembly, guide plate assembly, plurality of side guide stud and clamp assembly.
In accordance to the present invention, said handle assembly comprises a centre stud and lock nut which passes through both the guide plate.
In accordance to the present invention, said handle assembly comprises a handle and threaded stud which rotate manually to push stator assembly.
In accordance to the present invention, said guide plate assembly comprises a top plate, bottom plate and plurality of lock nuts to hold the plate against guide rod, wherein top plate will be fixed to side guide stud and bottom plate will be adjusted to suit the stator assembly.
3

In accordance to the present invention, said guide studs provides to the lift the clamp which will be attached to the rotor housing of BLDC motor.
In accordance to the present invention, said clamp which attached to the rotor housing of BLDC motor.
In accordance to the present invention, said clamp which hold the rotor housing of BLDC motor.
In accordance to the present invention, said clamp which may be any shape which provide griping, for example "C" shape which make strong grip between clamp and rotor housing and pull the rotor housing.
In accordance to the present invention, to remove or to pull out the stator assembly from rotor housing of BLDC motor. First the centre stud will have to align at the centre of stator shaft and 'C clamp at the rotor housing outer diameter and set the top and bottom plate by means of locking nuts. Afterward the centre stud will have to rotate in clockwise direction along with its own axis with the help of handle which will pull the rotor housing and thus the stator assembly will remove from the rotor housing.
Dated this 20th day of March 2009
(Ivan Bernard Fuller)
ofKhaitan&Co
Agent for the Applicants
4