HIGH STARTING TORQUE DIRECT LINE OPERATED ENERGY EFFICIENT MOTOR

Abstract

The high efficiency motor employing the principle of three phase induction motor and permanent magnet synchronous motor includes a stator assembly and a rotor assembly. The rotor assembly includes a rotor shaft, a rotor stack assembly, a rotor cover and end ring. The rotor stack assembly includes a stamping stack, a conductor bar and a magnet. The stamping stack has dedicated slots for the conductor bar and the magnet. The rotor cover is fitted on the rotor stack, wherein both axial ends of the rotor cover are closed by end rings.

Claims

1. A high efficiency motor, comprising: stator assembly; and rotor assembly, wherein said rotor assembly comprises a rotor shaft; a rotor stack assembly; a rotor cover; and an end ring, wherein said rotor stack assembly comprises a stamping stack; slots; conductor bars; and magnets, and wherein one of said slots is provided with defined interval-x and distance-y defined as minimum distance between outer periphery of the stamping stack and edge of the magnet.

2. The motor as claimed in claim 1, wherein the interval-x may vary from two to ten times the distance-y.

3. The motor as claimed in claim 1, wherein the rotor cover is fitted on the rotor stack and both axial ends of the rotor cover are closed by the end ring.

4. The motor as claimed in claim 1, wherein the number of a magnet is placed in slot in a manner to form a specific shape selected from a group comprising: Arc shape, Semi Hexagon Profile, Semi Octagon Profile, Semi Decagon profile, and Semi Polygon Profile.

5. The motor as claimed in claim 1, wherein said magnet and slot have curved cross section normal to the longitudinal axis of the rotor stack.

6. The motor as claimed in claim 1, wherein said stamping stack has a notch along a longitudinal axis of the stamping stack.

7. The motor as claimed in claim 1, wherein said slots are filled with conductor bar and have a common inner end radius.

8. The motor as claimed in claim 1, wherein the material of said conductor bar is selected from a group consisting of Aluminum and Copper.

9. The motor as claimed in claim 1, wherein said conductor bar and magnet are firmly placed inside the slots.

10. The motor as claimed in claim 1, wherein said slot has a shape selected from a group comprising: Arc shape, Semi Hexagon Profile, Semi Octagon Profile, Semi Decagon profile, Semi Polygon Profile, said shape being adapted to the shape of the magnet.

11. The motor as claimed in claim 1, wherein the material used for rotor cover is selected from a group comprising: Ferrous Metal, Aluminum, Aluminum Alloy, Copper, Copper Alloy, Zinc, Zinc Alloy, Lead, Lead Alloy, Chromium, Chromium Alloy, Nickel, Nickel Alloy, Tin, Tin Alloy, Silver, and Silver Alloy.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0025] FIG. 1 illustrates the Exploded View of the Rotor Assembly

[0026] FIG. 2 depicts the Isometric Sectional View of the Rotor Assembly

[0027] FIG. 3 illustrates the Sectional View of Rotor Assembly

[0028] FIG. 4 illustrates the Isometric Sectional View of Stack Assembly

[0029] FIG. 5 depicts the Sectional View of second embodiment of Rotor Stack Assembly

DETAILED DESCRIPTION OF THE INVENTION

[0030] The present invention relates to a self-start synchronous motor designed for providing high starting torque. The method of starting the motor involves the principle of three phase induction motor and the motor runs on the principle of permanent magnet synchronous motor. The motor operates by said methods by using a rotor having cage bars with reduced cross section that provides high starting torque and the magnet placed in the rotor to enable the rotation of the motor at synchronous speed.

[0031] The present invention relates to a motor, said motor comprising of: a stator assembly; a rotor assembly (2); wherein said rotor assembly comprises of a rotor shaft (3); a rotor stack assembly (7), a rotor cover (5) and an end ring (6). The rotor stack assembly (7) further comprises of a stamping stack (4), a magnet (8); and a conductor bar (9). The stamping stack (4) provides slots (10,11) for the conductor bars (9) and the magnets (8) respectively.

[0032] The magnet (8) is placed in a radially symmetrical manner in the stamping stack (4). The magnet slots (11) that are provided towards the inner peripheral portion are at defined interval-x. The interval-x may vary from two to ten times the distance-y, wherein y is the minimum distance between the outer periphery of stamping stack and the edge of the magnet (8).

[0033] According to the invention, said rotor cover (5) is fitted on the rotor stack (7) and the end rings (6) covers both axial ends of the rotor cover (5).

[0034] The magnet (8) and the slot (11) have a curved cross section normal to the longitudinal axis (12) of the rotor stack, wherein stamping stack (4) has a notch (1) along the longitudinal axis (12). All the slots (10) filled with conductor bar have a common inner end radius.

[0035] The material of the said conductor bar is selected from a group consisting of aluminum, aluminum alloy and copper, copper alloy.

[0036] Said rotor cover (5) may be prepared from materials including, not limiting to, Ferrous Metal, Aluminum, Aluminum Alloy, Copper, Copper Alloy, Zinc, Zinc Alloy, Lead, Lead Alloy, Chromium, Chromium Alloy, Nickel, Nickel Alloy, Tin, Tin Alloy, Silver, Silver Alloy.

[0037] Said slot (10) forms a shape of, not limiting to, Round, Pear, Oval, Oblong, Elliptical, Square, Rectangle, Triangle, Equilateral Polygon, Equiangular Polygon, Regular Polygon, and Irregular Polygon.

[0038] Said slot (11) possesses a shape, not limiting to, Arc shape, Semi Hexagon Profile, Semi Octagon Profile, Semi Decagon profile, Semi Polygon Profile that is adapted to the shape of the magnet (8).

[0039] A number of the magnets (14) are placed in slot (13) to form a shape of, not limited to, arc and trapezoid.