Abstract: The disclosed embodiments describe a partially caged rotor for use in an interior permanent magnet motor and techniques for fabricating thereof. In some embodiments, a caged rotor includes: a rotor core having a shaft; a rotor cage comprising a plurality of conductor bars; and a plurality of permanent magnets at least partially disposed inside a plurality of mounting holes of the core, the plurality of permanent magnets and the plurality of mounting holes forming a plurality of cavities inside the core; wherein each conductor bar is disposed at a respective cavity of the plurality of cavities such that the plurality of conductor bars is of a number greater or equal to 8 and less or equal to 64.

Abstract: A method comprises providing a motor with a stator comprising a plurality of laminations stacked side to side to form a contiguous stator core with each of the laminations having a plurality of radial fins projecting outward from a periphery of the lamination, and a rotor with permanent magnets spaced about the rotor configured to synchronously magnetically couple with a rotating magnetic field in the stator. The method further comprises providing a cooling tower with a fan disposed therein having a shaft extending from a center of the fan for rotating the fan. The motor is installed in the cooling tower such that the rotor of the motor is coupled directly to the fan shaft and rotates the fan when the motor is energized during normal operation of the cooling tower.

Abstract: A method comprises providing a motor with a stator comprising a plurality of laminations stacked side to side to form a contiguous stator core with each of the laminations having a plurality of radial fins projecting outward from a periphery of the lamination, and a rotor with permanent magnets spaced about the rotor configured to synchronously magnetically couple with a rotating magnetic field in the stator. The method further comprises providing a cooling tower with a fan disposed therein having a shaft extending from a center of the fan for rotating the fan. The motor is installed in the cooling tower such that the rotor of the motor is coupled directly to the fan shaft and rotates the fan when the motor is energized during normal operation of the cooling tower.