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
Axial flux single stator double rotor BLDC Motor
APPLICANTS
Crompton Greaves Limited, CG House, Dr Annie Besant Road, Worli, Mumbai 400 030, Maharashtra, India, an Indian Company
INVENTORS
Kori Virendrakumar and Patwardhan Vinay Satish, both of Crompton Greaves Limited, CG Global R&D Centre, Advanced Motor Design and Technology Centre (AMDTC), Kanjur (E), Mumbai - 400042, Maharashtra, India, both Indian National
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the nature of this invention:

FIELD OF INVENTION
This invention relates to holding arrangement in an 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.
OBJECTS OF INVENTION
An object of the invention is to provide a novel method of holding the stator in an 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 winding and assembly of the axial flux motor.
DETAILED DESCRIPTION OF THE INVENTION
An Axial flux motor is a machine producing flux in the axial direction. The Flux path is parallel to the shaft axis. This invention is related to a double 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 single stator and two rotors are provided axially in which stator has winding and rotor has magnet. The stator is mounted on the shaft and placed in between two rotors with using bearings. Stator is mounted on a cast block normally called as a holder which is a one piece and used to hold the stator on the shaft. The holder is press fitted inside the stator and is again held with the pins provided from outside to restrict its radial movement and axial movement.
The stator is fitted with the one piece cast holder and further with reference to the shaft the holder is fitted perpendicular to the shaft. This assembly in turn maintains a uniform air gap between stator and rotor and provides a positive mechanical holding for the stator within axial flux motor
With this arrangement the air gap can be precisely controlled as per the requirement. The toroidal wound axial flux motors uses the potting compound to hold the wound stator with the shaft; which is not always stable at high temperatures and speeds.
This type of stator holding arrangement provides the positive mechanical holding and gives a stable arrangement of the axial flux motor.
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 stator using a holder which is made of one piece cast material either magnetic or non magnetic type with three to six no of spokes provided to support the ring , and corresponding two rotors to be fitted in the motor body and end shield, 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 a stator holder made up of steel and additional circlip is fitted to avoid the axial play which is provided on the shaft.
In accordance with present invention, an axial flux motor has three pins inserted from the outer diameter (OD) fixed at a reference distance which is supported by a holder on the shaft of the motor.
In accordance with present invention, an axial flux motor, also accompanied with a step on the shaft to locate the stator at a required position on the shaft to hold the wound stator intact in all conditions.
In accordance with present invention, an axial flux motor, the holder, pins, and shaft are manufactured with any material, preferably from mild steel.