DESC:FIELD OF INVENTION
The present invention relates to a split casing for a motor. More particularly, the present invention relates to a split casing for motor used in mixer grinder to ensure fast cooling of the motor. Further, the present invention relates to a split casing for motor provided with a cooling ring having fins that create more area for the cold air to pass through, thereby attaining fast cooling of the motor. Advantageously, the present invention ensures fast cooling of the motor thereby improving efficiency, performance and life of the motor.

BACKGROUND OF INVENTION
Generally, a mixer grinder has an outer cover, a main body, a mixer grinder jar positioned placed on top of the main body, and a bottom cover as an enclosure to mixer grinder motor with a knob or buttons for operation. The mixer grinders run on electric motor, said electric motors generate heat from the motor windings. The excessive heat produced in the motor degrades the overall performance and longevity of the motor. In general, the motor is an assembly of a bush, a carbon brush, a stator and a rotor enclosed in an enclosure and provides better alignment of stator and rotor. The enclosure holds the motor's components together and ensures proper alignment and rotation of the rotor.

Universal motor works on either DC or single phase AC supply. When current flows in the field winding, it provides an electromagnetic field. The same current also flows through the armature conductors through carbon brushes. When a current carrying conductor is placed in an electromagnetic field, it experiences a mechanical force, or torque, the rotor starts to rotate and makes the motor to work.

The existing motors have top and bottom frames which are completely open and don’t guide the air to pass through the stator, commutator and the rotor winding. Also, the brush holders and brush boxes are independent parts connected to the top casing, which can misalign the brush angle with commutators and commutation angle. Air can be sucked by the fan from, all the directions and they are not guided or don’t pass through the stator/ commutator/ rotor. Hence cooling of the motor is not sufficient and the motor efficiency and life is thus reduced. Motor may misalign during transit as the top and the bottom frames have minimal contact with stator. The motor needs separate cover/ stand to fix it to the mixer grinder body and guide the air flow.

US5684346A is a cooling device such as cooling jacket which concentrically surrounds a mantle surface of the motor for an electrically driven mixer in hot liquids. The jacket provided with a cooling liquid inlet and an outlet with a cylindrical partition wall dividing the jacket into two concentric gaps. The inner gap is considerably narrower than the outer gap. A cooling liquid passes between the two gaps, where the high velocity in the inner gap results in a very good heat transfer from the mantle surface. The lower velocity in the outer gap results in a lower heat exchange. Therefore the gap acts as an insulating layer between the motor and the hot surrounding liquid. However, the use of a cooling jacket with cooling liquid inlet and outlet adds cost and complexity to the mixer.
US3121178A is a motor driven food mixer comprising a housing consisting of upper and lower separate hollow casing sections. These casing sections are firmly retained in their intended motor-gearing enclosing relationship without being directly connected together and without actual contact between the adjacent overlapping edges of the two sections. A space between the edge of the upper casing section and edge of the lower casing section at the front of the housing provides an air intake opening. A space between the edges at the rear of the housing provides an air outlet opening. However, there is a chance to enter dirt or unwanted particles into the motor housing through the front and rear openings.

US2568773A is a variable speed motor used for food mixers. The motor casing is divided into an upper portion and a lower portion with semi-circular ventilating openings on two portions. Alternately, on one portion there is provided a hole and the other portion is merely be straight thereof. Cooling air is circulated through the openings by means of fan blades. However, there is a chance to enter dirt or unwanted particles into the motor housing through the ventilating openings.

CH515061 discloses a continuous duty mixer/kneader with a two part longitudinally split casing and an adjustable aperture outlet port through which the main shaft passes. The adjustment is provided by a symmetrical pair of pivoted flaps with curved inner edges near the shaft. A pair of external, mating levers on the pivot shafts are driven by a single non reversible linear actuator whose drive motor is controlled by a closed loop servo responding to the temp, viscosity etc. of the product. Continuous adjustment caters for changes in ambient conditions. However, the design is complex and the motor gets heated very soon.

CN205051480 discloses the components of a whole that can function independently preparation of the semicircle ladle casing body about the adoption of motor casing body, manufacturing cost has been practiced thrift greatly to preceding, the rear end cap of preparation no longer separately, has improved the production precision. Bearing frame and casing on the motor casing are integrative shaping, have solved the technical problem of the motor inclined to one side shake that the pivot very easily produced when installation and use, and when two semicircle cartridge case equipments, messenger's motor body part equipment process is simple, the motor precision of post assembling is high, and the motor shakes for a short time partially, has improved the motor stability in use to preceding, rear end cap is preserved wholly circular and a motor casing body coupling, has strengthened the holistic firmness of motor, lengthens the life of motor. However the motor is heated and performance of the motor is reduced even though life of motor is lengthened.

CN204231061 discloses a split type agricultural motor with convenient repair. The split type agricultural motor comprises a motor body. The bottom of the motor body is provided with a base. The split type agricultural motor is characterized in that the motor body comprises a casing which is internally provided with a cylindrical bracket, the upper part of the casing is provided with a strip-shaped box cover which is arranged on the cylindrical bracket through a connection column, the casing is formed by a left casing and a right casing, the bottom surface of the strip-shaped box cover is provided with two parallel upper guide rails, the upper and lower parts of the left casing and the right casing are correspondingly provided with upper lugs and lower lugs respectively. However the life of the motor is decreased and cooling of motor takes more time.

CN201584838 discloses a split-type rotary motor casing of an excavating machine. The rotary motor casing comprises a casing, wherein an inner chamber is formed inside the casing; a swash plate platform is arranged inside the inner chamber; a swash plate platform through hole is formed on the swash plate platform, a swash plate is mounted on the swash plate platform and adopts a truncated cylindrical body, the lower end surface of the swash plate is a circular plane, the upper end of the swash plate is an elliptic inclined plane, and a swash plate through hole is formed on the swash plate. The rotary motor casing can be manufactured by conventional common processing equipment due to the fact that the inner part of the casing dispenses with an inclined plane, thereby reducing the processing difficulty and cost. The swash plate can be directly replaced without scrapping the whole motor casing once the inclined plane of the swash plate is abraded, thereby effectively prolonging the service life of the motor casing and saving resources. However fast cooling of motor cannot be achieved.

WO2014051213A1 discloses a motor for an electric vehicle has a cooling function, and more particularly, due to its simple configuration, yet can reduce the manufacturing cost and the price is sufficient to apply to the various kinds for electric vehicle motors, what of all relates to a motor for an electric vehicle having a cooling function for improving the cooling efficiency. However the service life of the motor is less.

JP05153743 discloses the cooling air taken in from an air inlet passes axially through an air path thence flows peripherally through an air path. The cooling air flows into an air path entirely from the peripheral direction. In the air path, the cooling air flows inward through the gaps between coils arranged peripherally at several points to a delivery port defined by air guides and then delivered, at the point of air gap, substantially in the direction tangential to the rotating direction of a rotor. Furthermore, strength can be kept as it is because a rotor having conventional structure is employed. However the structure of the motor is complex.

Accordingly, there exists a need for a split casing for a motor to ensure fast cooling and prevent dirt or unwanted particles to enter into the motor enclosure thereby to improve efficiency, performance and life of the motor.

OBJECTS OF INVENTION
It is the primary object of the present invention to provide a simple split casing for a motor for use in mixer grinder to ensure fast cooling.

It is another object of the present invention to provide a split casing to guide air through the coil and rotor of the mixer grinder for better cooling.

It is another object of the invention to provide a simple split casing for a motor to prevent water or unwanted particles to enter into the motor enclosure.

It is another object of the present invention to provide a simple split casing to ensure fast cooling of the motor, thereby improving its efficiency, performance and life.

It is yet another object of the present invention, wherein the rotor and stator does not disturb during the assembly, in transit and in functional use.

It is further object of the present invention, wherein the split casing is easy for precision fitting and assembly.

It is another object of the present invention to provide a split casing with high resistance to entry of water from the top portion.

It is another object of the present invention, wherein a dielectric material body is provided to avoid any short circuit.

It is further object of the present invention, wherein a precise air gap and better air flow system is achieved to the motor, with the split casing.

It is further object of the present invention, wherein the split casing covers the motor fully and doesn’t require a stand or cover to fit the motor in the mixer grinder body.

It is further object of the present invention, wherein the brush box is built in the top casing and ensures 100% alignment with the commutator.

SUMMARY OF INVENTION
One or more of the problems/limitations of the conventional prior art may be overcome by various embodiments of the present invention.

It is another object of the present invention to provide a split casing for a motor, comprising of:
a top casing [1];
a bottom casing [2];
a cooling ring [3];
a stator [5];
a motor rotor shaft [6];
an air duct [7];
a fan [8]; and
a vent [10],
wherein the top casing [1] acts as a fully covered chamber to guide and allow the air to pass through the stator coil and the rotor,
wherein the bottom casing [2] acts as an air guide and pumps out air through the bottom,
wherein the stator [5] is the stationary part of the rotary system and is made up of laminated steel to reduce the eddy current induced during the operation of alternate current,
wherein the air duct [7] acts a suction chamber,
wherein the stator [5] is located between the top and bottom casings [1, 2], and
wherein the fan is attached to motor rotor shaft [6].

It is another object of the present invention, wherein the located stator [5] is covered with the cooling ring [3] having a plurality of the cooling fins [4] over it.

It is another object of the present invention, wherein the cooling ring [3] is sandwiched between the top and bottom casings [1, 2].

It is another object of the present invention, wherein the motor stator is sandwiched between the top and bottom casings [1, 2].

It is another object of the present invention, wherein the motor rotor shaft [6] is guided by bearings fitted with the top and bottom casings [1, 2].

It is another object of the present invention, wherein the air duct [7], the fan [8] and the bottom casing [2] act as air pump system.

It is another object of the present invention, wherein the motor cooling ring [3] is made up of any metal.

It is another aspect of the present invention, wherein the split casing covers the motor fully and doesn’t require a stand or cover to fit the motor in the mixer grinder body.

It is another aspect of the present invention, wherein the brush box is built in the top casing and ensures 100% alignment with the commutator.

It is another object of the present invention, wherein the top and bottom casings [1,2] are made up of any metal, non-metal or composite material.

It is another aspect of the present invention to provide a method of working of the split casing for motor, comprising:
sucking of the air by the air pump system;
passage of the air through the cooling fins [4] of cooling ring [3];
passing through the vent [10] provided in top casing [1] through the stator winding, commutator [9], rotor winding and pumped out through air guide of bottom casing [2]; and
cooling of the entire motor.

BRIEF DESCRIPTION OF THE DRAWINGS:
So that the manner in which the features, advantages and objects of the invention, as well as others which will become apparent, may be understood in more detail, more particular description of the invention briefly summarized above may be had by reference to the embodiment thereof which is illustrated in the appended drawings, which form a part of this specification. It is to be noted, however, that the drawings illustrate only a preferred embodiment of the invention and is therefore not to be considered limiting of the invention's scope as it may admit to other equally effective embodiments.
Figure 1: illustrates front view of the split casing for the motor according to the present invention depicting Top casing [1], Bottom casing [2], Cooling ring [3], Cooling fins [4], and Vent [10].
Figure 2: illustrates isometric view of the split casing for the motor according to the present invention depicting Top casing [1], Bottom casing [2], Cooling ring [3], Cooling fins [4], and Vent [10].
Figure 3: illustrates exploded view of the split casing for the motor according to the present invention depicting Top casing [1], Bottom casing [2], Cooling ring [3], Cooling fins [4], Vent [10], Stator [5], Motor rotor shaft [6], Air duct [7], Fan [8], and Commutator [9].

DETAILED DESCRIPTION OF THE INVENTION:
The present invention as herein described relates to a split casing for the motor. Further the present invention relates to a split casing for motor used in mixer grinder to ensure fast cooling of the motor.

Referring to Figures 1 to 3, the split casing for the motor comprising of a top casing [1], a bottom casing [2], a cooling ring [3] provided with a plurality of cooling fins [4] over it, a stator core [5], a motor rotor shaft [6], an air duct [7] and a vent [10]. The top casing [1] acts as an air sucking pump and allows air to pass through the stator or rotor. The top casing [1] is preferably made of Bakelite or metal or non metal or composite material. The bottom casing [2] acts as an air guide and pumps out air through the bottom. The bottom casing [2] is preferably made of Bakelite or metal or non metal or composite material. The stator [5] is the stationary part of the rotary system and is made up of laminated steel to reduce the eddy current induced during the operation with current conducting coil wound on it. The stator [5] is preferably made of CRCA or electrical steel/CRNGO. The air duct [7] acts a suction chamber. The air duct [7] is preferably made of nylon 6 glass filled 30% or metal or non metal or composite material. The motor stator is sandwiched between the top and bottom casing [1, 2]. The motor rotor shaft [6] is guided by bearings fitted with the top and bottom casings [1, 2]. The stator [5] is located between the top and bottom casings [1, 2]. The located stator [5] is covered with the cooling ring [3] with the cooling fins [4] over it. The cooling ring [3] is sandwiched between the top and bottom casings [1, 2]. The air is sucked by the motor to passes through the cooling fins [4] thereby attaining fast cooling of the motor. The cooling fins [4] are made of aluminum or metal. The air duct [7], the fan [8] and the bottom casing [2] act as air pump system to ensure flow of hot air through the air guides at the bottom casing [2]. The motor fan [8] is preferably made of nylon 6 glass filled 30% or metal or non metal or composite material. The air sucked by the air pump system flows through the cooling fins [4] of cooling ring [3], and enters through the vent [10] provided on the top casing [1] to pass through the stator winding, commutator [9], rotor winding and pumped out through the air guide at the bottom casing [2]. The commutator [9] is made of copper with metal or composite materials. The cooling ring [3] is made up of any metal.

The carbon bush holder and the bearing are fixed inside top motor casing [1]. The air duct [7] and the motor fan [8] are fixed inside bottom casing [2]. The commutator [9] is a rotating part in electric motors that periodically reverses the current direction between the motor rotor shaft [6] and the external circuit. An end insulation acts an insulator between the commutator [9] and the rotor lamination. The motor rotor shaft [6] is the rotating part of the rotor system where it is powered by the commutator [9]. The motor fan [8] helps to suck air from top to bottom and pumps out the air through the air flow guide ways provided in the air guide disc.
The motor with the split casing comprises of a stator winding, an oil felt, a swivel sintered bush, a motor bush retainer, a motor shaft, a carbon brush terminal, a rotor core, a circlip, a ball bearing, a bearing retainer, a M3 screw, M4 screw, a M5 screw, a hylam washer, a carbon brush brass terminal and a carbon brush assembly.

In another aspect of the invention is disclosed a method of working of the split casing for motor, comprising:
sucking of the air by the air pump system [2,7,8];
passage of the air through the cooling fins [4] of cooling ring [3];
passing through the vent [10] provided in top casing [1] to the stator winding, commutator [9], rotor winding and pumped out through air guide of bottom casing [2]; and
cooling of the entire motor.

The embodiments of the invention been disclosed in this specification are purely for illustrative purposes and the present invention can be embodied in many other forms or carried out in other ways, without departing from the spirit or essential characteristics thereof. It is understood that the invention is not limited thereto, but is susceptible of numerous changes and modifications as known to those skilled in the art, and all such variations or modifications lies within the scope of the present invention. ,CLAIMS:We Claim:
1. A split casing for a motor, comprising:
a top casing [1];
a bottom casing [2];
a cooling ring [3];
a stator [5];
a motor rotor shaft [6];
an air duct [7];
a fan [8]; and
a vent [10],
wherein the top casing [1] acts as an air guide that allows air to pass through the stator, commutator and the rotor,
wherein the bottom casing [2] acts as an air guide and pumps out air through the bottom,
wherein the stator [5] is the stationary part of the rotary system and is made up of laminated steel to reduce the eddy current induced during the operation of alternate current,
wherein the air duct [7] acts a suction chamber,
wherein the stator [5] is located between the top and bottom casings [1, 2], and
wherein the fan [8] is attached to the motor rotor shaft [6].

2. The split casing as claimed in claim 1, wherein the located stator [5] is covered with the cooling ring [3] having a plurality of the cooling fins [4] over it.

3. The split casing as claimed in claim 1, wherein the cooling ring [3] is sandwiched between the top and bottom casings [1, 2].

4. The split casing as claimed in claim 1, wherein the motor stator is sandwiched between the top and bottom casings [1, 2].

5. The split casing as claimed in claim 1, wherein the motor rotor shaft [6] is guided by bearings fitted with the top and bottom casings [1, 2].

6. The split casing as claimed in claim 1, wherein a brush box is built in the top casing [1].

7. The split casing as claimed in claim 1, wherein the air duct [7], the fan [8] and the bottom casing [2] act as air pump system.

8. The split casing as claimed in claim 1, wherein the cooling ring [3] is made of any metal.

9. The split casing as claimed in claim 1, wherein the top and bottom casings [1,2] cover the motor fully and doesn’t require a separate stand/ cover to fit the motor in the mixer grinder body.

10. The split casing as claimed in claim 1, wherein the top and bottom casings [1,2] are made up of any metal, non-metal or composite material.

11. The method of working of the split casing for motor, comprising:
sucking of the air by the air pump system [2,7,8];
passage of the air through the cooling fins [4] of cooling ring [3];
passing through the vent [10] provided in top casing [1] through the stator winding, commutator [9], rotor winding and pumped out through air guide of bottom casing [2]; and
cooling of the entire motor.