DESC:A STATOR FOR INDUCTION MOTOR WITH OCTA-SLOT CONFIGURATION, A ROTOR AND AN INDUCTION MOTOR THEREOF

TECHNICAL FIELD
[0001] The present disclosure, in general, relates to the field of induction motor. The present disclosure, particularly, relates to a stator for induction motor with octa-slot configuration, a rotor and an induction motor.

BACKGROUND
[0002] An induction motor is a type of AC motor where power is supplied to the rotor by electromagnetic induction. The induction motor is widely used in industrial and domestic applications due to its simplicity, ruggedness and cost effectiveness. The induction motor primarily comprises a stator and a rotor.
[0003] Figs. 1a and 1b illustrates isometric and top view of the stator in accordance with the existing art. The existing stator 100 is a 16-slots stator having 16 equally spaced slots 101. The slots 101 are adapted to hold the windings (coils of wire) that produce the magnetic field when energized. The number of slots affects the motor's torque, smoothness, and efficiency. A higher number of slots 101 generally allows for smoother operation and reduces torque ripple, but may require more complex winding patterns.
[0004] Providing windings on the 16-slots stator 100 is a very complex task. Since 16 slots 101 are provided in a very limited space, the windings also have very limited space for installation. The slots 101 have semi closed shape with bottle neck near the inner diameter of the stator 101. The bottle neck region 101a of the adjacent slots 101 together form a teeth portion 101b with the inner diameter of the stator 100. Generally, the coils are made separately, on coil forming machines and inserted into the slots 101 of the stator 100. Before inserting the windings, the stator slots 101 need to be prepared to ensure electrical insulation between the copper windings and the stator core 100, which is usually made of laminated steel.
[0005] The dimensions of the stator 100 are mentioned in the Table 1 below:

Table 1
S. No. Symbol Particular Dimension (mm)
1. A Length 74
2. B Width 74
3. C Stack Height 23.5
4. D Slot Mouth 2.2
5. E Slot Height 10.4
6. F Slot Depth 11
7. G Inner Diameter 44.05
8. H Teeth Width 5.1

[0006] The pre-formed coils are then inserted into the stator slots 101 one by one, with care taken to ensure even spacing and proper placement. Once all the coils are inserted, their ends are connected to form the appropriate phase windings.
[0007] Figs. 2a and 2b illustrates isometric and side view of the stator with windings in accordance with the existing art. In a conventional 16-slot stator core, two types of windings are used: the main winding and the auxiliary winding. The coils 201 are individually manufactured on a coil forming machine according to the stator's size. Once formed, the coils 201 are removed from the machine and placed onto an insertion jig. These jigs are then secured on a coil insertion machine, where the pre-formed coils 201 are pressed into the slots of the 16-slot stator. Afterward, the loop wires are soldered, heat shrink tubes are applied to the joints, and a thermal overheat protector is installed with the windings.
[0008] The entire process generates significant friction on the coil surface, which partially damages the primary insulation (varnish layer) of the coil 201, potentially impacting the motor's lifespan and reliability over time. To address this, the entire stator assembly 100 is re-varnished to provide secondary insulation.
[0009] Additionally, the insertion of windings into the slots increases the coil 201 height by 40 mm to 50 mm beyond the core length, causing the coils 201 to overhang by 20 mm to 25 mm. This overhang leads to flux loss and reduces the motor's efficiency. As a result, the 16-slot stator core has several drawbacks.
[0010] Figs. 3a and 3b illustrates isometric and top view of the rotor in accordance with the existing art. The corresponding rotor 300 of the 16-slot stator 100 also has plurality of slots 301 around its circumference. As the rotating component of the motor, the rotor 300 works together with the stator 100 to generate torque via electromagnetic induction. While the stator 100 produces a rotating magnetic field, the rotor 300 interacts with it to create motion. The slots 301 in the rotor 300 are designed to optimize this interaction. In induction motors, these rotor slots 301 primarily hold the conductors (aluminum bars) that carry the induced current.
[0011] The slots 301 on the rotor 300 are shaped like closed loops, with a narrower width towards the inner diameter and a wider width towards the outer diameter of the rotor 300.
[0012] The rotor 300 is positioned within the inner diameter of the stator 100, with an air gap maintained between the rotor's 300 outer boundary and the stator's 100 inner diameter.
[0013] The dimensions of the rotor 300 are given in Table 2 below:

Table 2
S. NO. Symbol Particular Dimension (mm)
1. A Outer Diameter 44.05
2. B Inner Diameter 8.05
3. C Stack Height 23.5
4. D Teeth Width 2.8
5. E Slot Depth 7.6

[0014] The motor constructed with the aforementioned stator and rotor design has low efficiency due to losses caused by design flaws in both components. These losses result from the stator's wider teeth and coil overhang.
[0015] Accordingly, there is a need for stator, rotor and induction motor with better efficiency and less losses.

OBJECT OF THE INVENTION
[0016] The objectives are provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. These objectives are not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter
[0017] It is one of the primary objectives of the present invention to develop a stator and a rotor which form a motor having better efficiency.
[0018] It is one of the primary objectives of the present invention to develop a stator and a rotor which form a motor having lower losses.
[0019] It is another objective of the present invention to develop a stator which has lesser teeth width for better flux density.
[0020] It is another objective of the present invention to develop a stator which has minimal overhang for better flux utilization.
[0021] It is another objective of the present invention to develop a rotor and stator combination with has minimum air gap in between.
[0022] It is another objective of the present invention to develop a stator and a rotor which is reliable and durable in the field.
[0023] It is another objective of the present invention to develop a stator and a rotor which has lesser field return and lesser production line rejection.
[0024] These and other objects of the present invention will be apparent from the following description and the accompanying drawings, which illustrate exemplary embodiments of the improved stator lamination design.

SUMMARY
[0025] This summary is provided to introduce concepts related to a stator for induction motor with octa-slot configuration, a rotor and an induction motor. The concepts are further described below in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.
[0026] The present subject matter relates to a stator for induction motor with octa-slot configuration. The stator comprises a laminated stator core, an octad of slots and a hole. The laminated stator core has an aperture adapted to accommodate a rotor with an air gap therebetween. The laminated stator core has an outer boundary and an inner boundary defined by the aperture. The octad of slots is provided around the inner boundary of the laminated stator core. The octad of slots are distributed uniformly to create a balanced rotating magnetic field. The hole is provided on each corner of the laminated stator core. Each of the hole is provided to fix the stator with both the motor end bells.
[0027] In an aspect of the invention, the slot has a polygonal shape with the edge adjacent to the outer boundary of the stator core is arcuate, and the remaining edges are linear.
[0028] In an aspect of the invention, the edge of each slot near the inner boundary has an opening toward the aperture, and the portions of the stator core between the inner boundaries of two adjacent slots define a teeth.
[0029] In an aspect of the invention, for a square profile, the stator has a length (A) and a width (B) in the range of 77 mm to 79 mm.
[0030] In an aspect of the invention, the laminated stator core has a stack height in the range of 21 mm to 28 mm.
[0031] In an aspect of the invention, the opening 404 is in the range of 1.5 mm to 2.5 mm.
[0032] In an aspect of the invention, the height (E) of each of the slots are in the range of 8.5mm to 9.5mm.
[0033] In an aspect of the invention, the depth (F) of each of the slots are in the range of 10.5 mm to 14 mm.
[0034] In an aspect of the invention, the inner diameter (G) defined by the inner boundary of the stator is in the range of 45 mm to 47 mm.
[0035] In an aspect of the invention, the width of the teeth (H) is in the range of 6 mm to 8 mm.
[0036] In an aspect of the invention, each of the slots of the stator is adapted to accommodate two sides of successive coil.
[0037] In an aspect of the invention, a coil holder is fixed on the stator on both sides, the windings being wound directly on the coil holder to form concentric layers.
[0038] The present subject matter further relates to a rotor for induction motor with stator having an octa-slot configuration. The rotor comprises a rotor core and a plurality of longitudinal slots. The rotor core has an outer boundary and an inner boundary defined by an aperture adapted to accommodate a shaft for rotation about an axis. The rotor core is adapted to positioned in the aperture of the stator maintaining a gap with the inner boundary of the stator. The plurality of longitudinal slots is formed along the outer periphery of the rotor core. The slots are adapted to accommodate conductors to carry induced current.
[0039] In an aspect of the invention, the plurality of longitudinal slots has a closed loop shaped with narrowing width towards the inner boundary region and relatively wider width towards the outer boundary of the rotor.
[0040] In an aspect of the invention, outer diameter (A) of the rotor defined by the outer boundary is in the range of 44 mm to 46 mm.
[0041] In an aspect of the invention, inner diameter (B) of the rotor defined by the inner boundary is in the range of 8 mm to 8.1 mm.
[0042] In an aspect of the invention, the rotor core has a stack height in the range of 21 mm to 28 mm.
[0043] In an aspect of the invention, the width of the teeth is in the range of 2 mm to 3 mm.
[0044] In an aspect of the invention, the slot depth (E) of each slot is in the range of 13.5mm to 14.5mm.
[0045] The present subject matter further relates to an induction motor comprising a stator with octa-slot configuration and a corresponding rotor.
[0046] To further understand the characteristics and technical contents of the present subject matter, a description relating thereto will be made with reference to the accompanying drawings. However, the drawings are illustrative only but not used to limit the scope of the present subject matter.
[0047] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.

BRIEF DESCRIPTION OF FIGURES
[0048] The illustrated embodiments of the present disclosure will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter, wherein:
[0049] Figs. 1a and 1b illustrates isometric and top view of the stator in accordance with the existing art;
[0050] Figs. 2a and 2b illustrates isometric and side view of the stator with windings in accordance with the existing art;
[0051] Figs. 3a and 3b illustrates isometric and top view of the rotor in accordance with the existing art;
[0052] FIG. 4a, 4b and 4c illustrates isometric, top and side view of an exemplary stator with octa-slot configuration that can be utilized to implement one or more exemplary embodiment of the present subject matter; and
[0053] FIG. 5a, 5b and 5c illustrates isometric, top and side view of an exemplary rotor that can be utilized to implement one or more exemplary embodiment of the present subject matter.
[0054] The figures depict embodiments of the present subject matter for the purposes of illustration only. A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION
[0055] A few aspects of the present disclosure are explained in detail below with reference to the various figures. Example implementations are described to illustrate the disclosed subject matter, not to limit its scope. Those of ordinary skill in the art will recognize a number of equivalent variations of the various features provided in the description that follows.
Definitions
[0056] In the disclosure hereinafter, one or more terms are used to describe various aspects of the present disclosure. For a better understanding of the present disclosure, a few definitions are provided herein for better understating of the present disclosure.
[0057] “Octad of Slots” is defined as, in context of the disclosure, a group of eight stator slots arranged circumferentially around the inner periphery of the stator core.
[0058] “Teeth” of stator is defined as, in context of the disclosure, the radially inward projecting portions of the stator core located between two adjacent stator slots.
[0059] “Teeth” of rotor is defined as, in context of the disclosure, the radially outward projecting portions of the rotor core located between two adjacent longitudinal slots.

EXEMPLARY IMPLEMENTATIONS
[0060] While the present disclosure may be embodied in various forms, there are shown in the drawings, and will hereinafter be described, some exemplary and non-limiting embodiments, with the understanding that the present disclosure is to be considered an exemplification of the invention and is not intended to limit the invention to the specific embodiments illustrated. Not all of the depicted components described in this disclosure may be required, however, and some implementations may include additional, different, or fewer components from those expressly described in this disclosure. Variations in the arrangement and type of the components may be made without departing from the scope of the claims as set forth herein.
[0061] The conventional 16-slot stator design presents multiple drawbacks. Due to the limited slot space and semi-closed slot geometry, coil insertion is complex and generates friction that damages the primary insulation, thereby reducing motor reliability and requiring re-varnishing. The tightly spaced slots also restrict winding installation, while the resulting coil overhang increases flux losses and reduces efficiency. Additionally, the wider teeth in the stator core and corresponding rotor design further contribute to performance losses, collectively leading to lower efficiency and reliability of the induction motor.
[0062] To solve this problem, a stator assembly for induction motor with octa-slot configuration, a corresponding rotor and induction motor is needed.
[0063] The present disclosure provides a stator assembly for induction motor with octa-slot configuration, a corresponding rotor and induction motor that overcomes the above-mentioned drawbacks of existing stator, rotor and induction motor.
[0064] FIG. 4a, 4b and 4c illustrates isometric, top and side view of an exemplary stator with octa-slot configuration that can be utilized to implement one or more exemplary embodiment of the present subject matter. The stator 400 for induction motor with octa-slot configuration comprises a laminated stator core 400a, an octad of slots 402 and a plurality of holes 403. The laminated stator core 400a has an aperture 401. The aperture 401 is adapted to accommodate a rotor with an air gap therebetween. The laminated stator core 400a has an outer boundary 400aa and an inner boundary 400ab. The inner boundary of the laminated stator core 400a is defined by the aperture 401.
[0065] The octad of slots 402 is provided around the inner boundary 400ab of the laminated stator core 400a. The octad of slots 402 are distributed uniformly to create a balanced rotating magnetic field. In an aspect of the invention, each quadrant of the stator 400 has two slots 402. The geometry of octad of slots 402 of the stator 400 are identical to each other. The slots 402 of the octad of slots 402 has a semi closed shape with a small opening forming around the aperture 401.
[0066] The hole 403 is provided on each corner of the laminated stator core 400a. Each of the hole 403 is provided to fix the stator 400 with both the motor end bells.
[0067] Each slot 402 of the octad of slots has a polygonal shape with the edge 402a adjacent to the outer boundary 400aa of the laminated stator core 400a is arcuate. Further, the remaining edges of the slots 402 of the octad of slots are linear.
[0068] The edge 402b of each slot near the inner boundary 400ab has an opening towards the aperture 401. The portions of the stator core 400a between the inner boundaries of two adjacent slots 402 define a teeth.
[0069] In an aspect of the invention, the laminated stator core 400a has a square geometry. For square profile, the stator has a length A and a width B in the range of 77 mm to 79 mm.
[0070] In an aspect of the invention, the laminated stator core has a stack height in the range of 21 mm to 28 mm.
[0071] In an aspect of the invention, the opening 404 is in the range of 1.5 mm to 2.5 mm.
[0072] In an aspect of the invention, the height E of each of the slots 402 of the octad of slots are in the range of 8.5 mm to 9.5 mm.
[0073] In an aspect of the invention, the depth F of each of the slots 402 of the octad of slots are in the range of 10.5 mm to 14 mm.
[0074] In an aspect of the invention, the inner diameter G defined by the inner boundary of the stator is in the range of 45 mm to 47 mm.
[0075] In an aspect of the invention, the width of the teeth H is in the range of 6 mm to 8 mm.
[0076] In an aspect of the invention, each of the slots 402 of the octad of slots of the stator is adapted to accommodate two sides of successive coil.
[0077] In an aspect of the invention, a coil holder is fixed on the stator 400 on both sides, the windings being wound directly on the coil holder to form concentric layers.
[0078] The dimensions of the stator 400 are mentioned in the Table 3 below:
Table 3
S. No. Symbol Particulars Dimension (mm)
1. A Length 77-79
2. B Width 77-79
3. C Stack Height 21-28
4. D Opening 1.5-2.5
5. E Slot Height 8.5-9.5
6. F Slot Depth 10.5-14
7. G Inner Diameter 45-47
8. H Teeth Width 6-8
[0079] Each of the slots 402 of the octad of slots of the stator 400 is adapted to accommodate two sides of successive coil. The slots 402 of the octad of slots is designed to give the same output as 16 slots stator 100 but with better efficiency and ease in manufacturing.
[0080] The slots 402 of the octad of slots of the stator 400 has more space to accommodate windings. Further, it is possible to directly provide the windings over the octad of slots. Coil holder is fixed on the stator 400 on both sides. The coils are wounded directly on the coil holder creating layers followed by concentric winding. Due to coils being directly wounded over the coil holder, there is no overhanging of coil and any loss of magnetic flux is removed. Further, less amount of copper is needed. Subsequently, soldering is done on the loop wires and heat shrink tubes are fitted on joints. A thermal overheat protector is fixed with cable tie. Since coils are wounded directly, action of frictional force over the pre-formed coils during insertion is eliminated. Accordingly, there is no need to provide secondary insulation after production of stator 400 with windings. Field failures of the stator 400 decreases directly.
[0081] With automation in the process of winding, productivity is increased and manpower is saved. Also, with automation, the production line rejection is decreased. This reduces the dependency on skilled manpower.
[0082] FIG. 5a, 5b and 5c illustrates isometric, top and side view of an exemplary rotor that can be utilized to implement one or more exemplary embodiment of the present subject matter. The rotor 500 comprises a rotor core 500a and a plurality of longitudinal slots 502. The rotor core 500a has an outer boundary and an inner boundary 500b. The inner boundary 500b is defined by an aperture 501. The aperture 501 is adapted to accommodate a shaft for rotation about an axis. The rotor core 500a is adapted to positioned in the aperture 401 of the stator 400 maintaining a gap with the inner boundary 400ab of the stator 400.
[0083] The rotor 500 is the rotating part of the motor, which works in conjunction with the stator 400 to generate torque through electromagnetic induction. While the stator 400 generates a rotating magnetic field, the rotor 500 interacts with this field to produce motion. The presence of longitudinal slots 502 in the rotor 500 helps optimizes this interaction. In induction motors, the longitudinal slots 502 are primarily used to hold the conductors (aluminum bars) that carry the induced current.
[0084] The plurality of longitudinal slots 502 formed along the outer periphery of the rotor core 500a. The slots 502 are adapted to accommodate conductors to carry induced current.
[0085] In an aspect of the invention, the plurality of longitudinal slots 502 has a closed loop shaped with narrowing width towards the inner boundary 500ab region and relatively wider width towards the outer boundary 500aa of the rotor 500.
[0086] In an aspect of the invention, the outer diameter A of the rotor defined by the outer boundary is in the range of 44 mm to 46 mm.
[0087] In an aspect of the invention, the inner diameter B of the rotor defined by the inner boundary is in the range of 8 mm to 8.1 mm.
[0088] In an aspect of the invention, the rotor core 500a has a stack height in the range of 21 mm to 28 mm.
[0089] In an aspect of the invention, the width of the teeth is in the range of 2 mm to 3 mm.
[0090] In an aspect of the invention, the slot depth E of each longitudinal slot 502 is in the range of 13.5mm to 14.5mm.
[0091] The rotor 500 is placed in the inner diameter of the stator 400. The outer boundary 500aa of the rotor 500 and the inner diameter of the stator 400 maintains an air gap in between. To reduce the air gap between the rotor 500 and the stator 400, the outer diameter 500aa of the rotor 500 is increased.
[0092] The dimensions of the rotor 500 are given in Table 4 below:
Table 4
S. NO. Symbol Particular Dimension (mm)
1. A Outer Diameter 44-46
2. B Inner Diameter 8-8.1
3. C Stack Height 21-28
4. D Teeth Width 2-3
5. E Slot Depth 13.5-14.5

[0093] The slot depth in the rotor 500 for stator 400 with octa-slot configuration is increased to reduce losses. Further, the outer diameter A of the rotor 500 is increased to reduce the air gap between rotor 500 and stator 400.
[0094] Together the rotor 500 and the stator 400 forms an induction motor.
ADVANTAGES
[0095] The stator with an octa-slot configuration, together with its corresponding rotor and induction motor, provides several significant advantages over conventional 16-slot designs:
• Improved Efficiency: By adopting an octa-slot configuration with mentioned slot geometry, the stator enables more uniform flux distribution and minimizes flux leakage. This directly reduces energy losses, thereby enhancing the overall efficiency of the motor.
• Reduced Losses: The compact octa-slot configuration and reduced coil overhang ensure minimal copper and core losses during operation. The optimized teeth and slot dimensions further reduce hysteresis and eddy current losses, resulting in lower heat generation and superior performance.
• Minimal Overhang for Enhanced Flux Utilization: The winding arrangement in the stator with octa-slot stator is designed to minimize coil overhang beyond the stator core. This ensures better flux utilization, reduces flux leakage at the ends, and improves the effective use of copper, thereby lowering material wastage.
• Minimum Air Gap for Improved Electromagnetic Coupling: The complementary design of the rotor and stator with octa-slot configuration provides a uniform and minimal air gap between the two components. This reduces magnetizing current requirements and enhances electromagnetic coupling, thereby improving torque generation and motor performance.
• Reliability and Durability: The simplified octa-slot configuration and reduced coil insertion complexity decrease the risk of insulation damage during winding. This leads to longer insulation life, less need for re-varnishing, and enhanced reliability and durability of the motor in practical field applications.
• Lower Field Returns and Production Line Rejections: The octa-slot configuration of stator allows for easier winding insertion with less mechanical stress on the coils, thereby reducing manufacturing defects. This not only improves production yield but also lowers the incidence of field failures and warranty claims, offering a more commercially viable solution.
• Overall Operational Superiority: The combined effect of higher efficiency, reduced losses, minimal flux leakage, and enhanced durability ensures that the stator with octa-slot configuration, rotor, and induction motor perform significantly better than conventional designs, making them suitable for a wide range of industrial applications where reliability and efficiency are critical.
[0096] The above description does not provide specific details of the manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0097] Further, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure.

,CLAIMS:We Claim:
1. A stator (400) for induction motor with octa-slot configuration, the stator (400) comprises:
a laminated stator core (400a) having an aperture (401) adapted to accommodate a rotor with an air gap therebetween, wherein the laminated stator core (400a) has an outer boundary (400aa) and an inner boundary (400ab) defined by the aperture (401);
an octad of slots (402) provided around the inner boundary (400ab) of the laminated stator core (400a), wherein octad of slots (402) are distributed uniformly to create a balanced rotating magnetic field; and
a hole (403) provided on each corner of the laminated stator core (400a), wherein each of the hole (403) is provided to fix the stator (400) with both the motor end bells.

2. The stator (400) as claimed in claim 1, wherein the slot (402) has a polygonal shape with the edge (402a) adjacent to the outer boundary (400aa) of the stator core (400a) is arcuate, and the remaining edges (402b, 402c) are linear.

3. The stator (400) as claimed in claim 1, wherein the edge (402b) of each slot near the inner boundary (400ab) has an opening (404) toward the aperture (401), and the portions of the stator core (400a) between the inner boundaries of two adjacent slots define a teeth.

4. The stator (400) as claimed in claim 1, wherein for a square profile, the stator has a length (A) and a width (B) in the range of 77 mm to 79 mm.

5. The stator as claimed in claim 1, wherein the laminated stator core has a stack height in the range of 21 mm to 28 mm.

6. The stator as claimed in claim 3, wherein the opening (404) is in the range of 1.5 mm to 2.5 mm.

7. The stator as claimed in claim 1, wherein the height (E) of each of the slots are in the range of 8.5mm to 9.5mm.

8. The stator as claimed in claim 1, wherein the depth (F) of each of the slots are in the range of 10.5 mm to 14 mm.

9. The stator as claimed in claim 1, wherein the inner diameter (G) defined by the inner boundary of the stator is in the range of 45 mm to 47 mm.

10. The stator as claimed in claim 3, wherein the width of the teeth (H) is in the range of 6 mm to 8 mm.

11. The stator as claimed in claim 1, wherein each of the slots of the stator is adapted to accommodate two sides of successive coil.

12. The stator as claimed in claim 3, wherein a coil holder is fixed on the stator on both sides, the windings being wound directly on the coil holder to form concentric layers.

13. A rotor (500) for induction motor with stator (400) having an octo-slot configuration, the rotor (500) comprises:

a rotor core (500a) having an outer boundary (500a) and an inner boundary (500ab) defined by an aperture (501) adapted to accommodate a shaft for rotation about an axis, wherein rotor core (500a) is adapted to positioned in the aperture (401) of the stator maintaining a gap with the inner boundary of the stator; and
a plurality of longitudinal slots (502) formed along the outer periphery of the rotor core (500a), wherein the slots (502) are adapted to accommodate conductors to carry induced current.

14. The rotor (500) as claimed in claim 13, wherein the plurality of longitudinal slots (502) has a closed loop shaped with narrowing width towards the inner boundary (500ab) region and relatively wider width towards the outer boundary (500aa) of the rotor (500).

15. The rotor (500) as claimed in claim 13, wherein outer diameter (A) of the rotor defined by the outer boundary is in the range of 44 mm to 46 mm.

16. The rotor as claimed in claim 13, wherein inner diameter (B) of the rotor defined by the inner boundary is in the range of 8 mm to 8.1 mm.

17. The rotor as claimed in claim 13, wherein the rotor core has a stack height in the range of 21 mm to 28 mm.

18. The rotor as claimed in claim 13, wherein the width of the teeth is in the range of 2 mm to 3 mm.

19. The rotor as claimed in claim 13, wherein the slot depth (E) of each slot is in the range of 13.5mm to 14.5mm.

20. An induction motor comprises a stator (400) as claimed in claim 1 and a rotor (500) as claimed in claim 13.