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 rule 13)
TITLE OF THE INVENTION
Maintaining Uniform Air Gap In Axial Flux Motor
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Patwardhan Vinay Satish , of CG Global R&D Centre, Advanced Motor Design and Technology Centre (AMDTC), Kanjur (E), Mumbai - 400042, Maharashtra, India, an Indian National
PREAMBLE TO THE DESCRIPTION
The following specification describes the invention:

FIELD OF INVENTION
This invention relates to maintain the uniform air gap in axial flux motor.
BACKGROUND OF INVENTION
In prior art patent no. US2005029886A1 and EP1436883A2 discloses distribution of flux between stator and rotor by means of flux distribution plates placed between stator and rotor and the coils are wound on the legs of the stator disc. This is providing a axial flux permanent magnet generator itself and not any means to maintain a uniform air gap. The claim states that the stator and rotor are parallel but not perpendicularity and by any means locating the stator.
An object of the invention is to maintain the uniform air gap in axial flux motor.
Another object of the invention is to provide higher torque efficiency due to uniform air gap flux in axial flux motor
Yet another object of the invention is to provide ease of assembly of the axial flux motor
DESCRIPTION OF THE INVENTION
An Axial flux .motor is a machine producing flux in the axial direction. Specifically this invention is related to a single sided axial flux motor in which the flux crosses the air gap in the axial direction and travels circumferentially around the stator and rotor discs to complete the path. Axial flux motors are disc shaped, rather than commonly available drum shape that is typical of radial flux motors. The disc shape is the result of the stator and rotor being placed adjacent to each other rather than the rotor spinning inside the stator cylinder and both the discs have same inner and outer diameter.
In the present invention, a stator and rotor provided axially in which stator has winding and rotor has magnet. The rotor is mounted on the shaft and placed inside the bottom end shield with a bearing. Stator is mounted on a back plate using screws, which is again press fitted on a sleeve. This stator-back plate and sleeve assembly is press fitted on to shaft.
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The stator is fitted with back plate using mounting screw and further with reference to the shaft the sleeve is fitted perpendicular to the shaft.. This assembly in turn maintain a uniform air gap between stator and rotor within axial flux motor.
With this arrangement the air gap can be precisely controlled as per the requirement.
Because of uniform air gap provided, the torque as well as the efficiency of such axial flux motor increases.
In accordance with present invention, an axial flux motor having an assembly of disc type single sided stator, a corresponding rotor to be fitted in the bottom end shield, a rotor back plate and a sleeve along with shaft.
In accordance with present invention, an axial flux motor, wherein the stator or rotor has the affinity to get attracted towards each other due to strong magnetic force in between.
In accordance with present invention, an axial flux motor, comprises of an additional back plate facing the back side of the stator which is screw fixed to the stator.
In accordance with present invention, an axial flux motor, has one pin fixed at a reference distance which is supported on a shaft of the motor. In accordance with present invention, an axial flux motor, also accompanied with a sleeve between the pin and back plate to hold the plate intact in all conditions.
In accordance with present invention, an axial flux motor, back plate an pin are manufactured any material, preferably from mild steel and of the same diameter as that of the stator.
Dated this 30th day of March 2007

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