High-efficiency and high-performance stator assembly for a motor

A stator assembly of a motor, comprising:

• a stator core;
• a stator winding unit installed in the stator core to generate kinetic energy in cooperation with a rotor of the motor;
• a first switching unit;
• the stator winding unit comprising:
• a first winding including a first electrical conductor with a rectangular or square cross-section and a first rated output power under given conditions;
• a second winding including a second electrical conductor with a circular cross-section and a second rated output power under the same conditions;
• wherein the first rated output power is greater than or equal to the second rated output power;
• wherein the first switching unit includes a first R-phase switching device, a first S-phase switching device, and a first T-phase switching device;
• wherein the first winding includes a R-phase first winding electrically connecting to an AC power source, a S-phase first winding electrically connecting to the AC power source, and a T-phase first winding electrically connecting to the AC power source, the R-phase first winding, the S-phase first winding, and the T-phase first winding are connected in either a wye configuration or a delta configuration;
• and
• wherein the second winding includes a R-phase second winding electrically connecting to the AC power source via the first R-phase switching device, a S-phase second winding electrically connecting to the AC power source via the second S-phase switching device, and a T-phase second winding electrically connecting to the AC power source via the first T-phase switching device, the R-phase second winding, the S-phase second winding and the T-phase second winding are connected in either a wye configuration or a delta configuration;
• whereby, during the start-up stage of the motor, the first switching unit is closed, allowing the AC power source to connect to both the first and second windings simultaneously, providing a combined output power to the motor;
• as the motor approaches a predetermined speed, the first switching unit is opened, enabling the AC power source to source power only to the first winding, which outputs the first rated power externally.

A method for assembling a stator assembly of a motor, comprising the following steps:

• providing a stator core having a plurality of slots wherein each of the slots includes a closed bottom and an open top and is divided into a first portion near the closed bottom and a second portion near the open top;
• selecting a stator winding unit installed in the stator core;
• providing a first switching unit,
• wherein the stator winding unit comprises:
• a first winding installed in the first portion of each of the slots and including a first electrical conductor with a rectangular or square cross-section and a first rated output power under given conditions,
• a second winding installed in the second portion of each of the slots and including a second electrical conductor with a circular cross-section and a second rated output power equal to or smaller than the first rated output power under the same given conditions,
• electrically connecting the first winding to a power source, and
• electrically connecting the second winding to the power source via the first switching unit.