Fan with improved electric motor and mounting

An electric motor assembly for driving a bladed propeller of a portable fan assembly, comprising;

• a motor drive assembly having a rotor with an output shaft and a stator of stacked laminations and wire windings;
• slots formed in the laminations, each said slot having a transverse aperture dimensioned to provide a passageway for said windings passing between a first side of the laminations and a second side of the laminations, at least one bolt hole aperture passing through said laminations
• a front casing positioned to cover at least a portion of the first side of said laminations, and a rear casing positioned to cover at least a portion of the second side of said laminations, said front casing body secured to said rear casing by at least one fastener passing through the bolt hole aperture of the laminations, wherein an outer casing wall of said rear casing is positioned radially outward of the windings at a distance configured to provide a space such that motor wiring passes only between the outer wall and the windings;
• and
• said front casing having an outer sidewall with an indented region extending radially inward toward the windings and configured to provide a recess at least partially surrounding said fastener.

An electric motor assembly for driving a bladed propeller of a portable fan assembly, comprising;

• a motor drive assembly having a rotor with an output shaft and a stator of stacked laminations and wire windings;
• slots formed in the laminations, each said slot having a transverse aperture dimensioned to provide a passageway for said windings passing between a first side of the laminations and a second side of the laminations;
• a front casing formed of cast aluminum and a rear casing formed of cast aluminum, said front and rear casings each having an outer casing wall, said outer casing wall of said rear casing being positioned radially outward of the windings at a distance configured to provide a space for wiring to pass between the outer wall and the windings, and at least one body portion extending radially outward of one of the outer casing walls, then at least one body portion being configured to provide a mounting bracket with at least a pair of mounting holes for securing the motor in a fan body;
• the front casing outer wall comprising a generally circular geometry, indented regions extending radially inward of said generally circular geometry, and a recess configured to receive at least a portion of a fastener securing the front casing into engagement with said stacked laminations, each said indented region being in linear alignment with an aperture in said laminations configured to receive a portion of a fastener extending from said front casing, and wherein said rear casing receives a portion of said fastener to fasten the front casing to the rear casing by a threaded fastener passing from said indented regions through the aperture in said laminations and passing into the rear casing;
• and
• said pair of mounting holes are each aligned along an axis of a mounting surface that resides radially outward of said,outer casing walls.

An electric 4-pole permanent split capacitor motor assembly for driving a fan blade, comprising;

• a front casing at least partially defining a front chamber, and a rear casing at least partially defining a rear chamber;
• a motor drive assembly having a rotor with an output shaft and a stator of stacked laminations and wire windings, slots being formed in the laminations, and each said slot having a transverse aperture dimensioned to provide a passageway for said windings passing through the laminations, said windings having a portion residing in said front chamber and having a portion residing in said rear chamber;
• said rear chamber having a sidewall area positioned at a distance radially outward of an region of said windings, the distance being adapted to provide a space for electrical wires to pass radially outward of the windings and between the windings and the sidewall;
• said rotor having a metal core with an electronic resistance value providing a peak torque output of drive assembly, at least an outer portion of said rotor having an outer coating of matrix material, said matrix material being adapted to increase said resistance value of the rotor to thereby reduce said peak torque output of said drive assembly.

An electric motor assembly for driving a bladed propeller of a portable fan assembly, comprising;

• a motor drive assembly having a rotor with an output shaft and a stator of stacked laminations and wire windings;
• slots formed in the laminations, each said slot having a transverse aperture dimensioned to provide a passageway for said windings passing between a first side of the laminations and a second side of the laminations;
• a front casing formed of cast aluminum and a rear casing formed of cast aluminum, said front and rear casings each having an outer casing wall, at least a portion of the outer wall of said rear casing is positioned radially outward of the windings at a distance adapted to provide a space for wiring to pass between the outer wall and the windings;
• the front casing outer wall has a generally circular geometry, said front casing outer wall having indented regions extending radially inward of said generally circular geometry comprising a recess adapted to receive at least a portion of a fastener securing the front casing into engagement with said stacked laminations.

An electric motor assembly for driving a bladed propeller of a portable fan assembly, comprising;

• a motor drive assembly having a rotor with an output shaft and a stator of stacked laminations and wire windings;
• slots formed in the laminations, each said slot having a transverse aperture dimensioned to provide a passageway for said windings passing between a first side of the laminations and a second side of the laminations;
• a front casing having an end-wall and positioned to cover at least a portion of the first side of said laminations, and a rear casing having an end-wall and positioned to cover at least a portion of the second side of said laminations;
• the end-wall of the front casing comprising a recessed portion having an inwardly directed passageway toward the rear end-wall and generally disposed in the center of the endwall to define a central opening wherein the output shaft of the motor drive assembly passes through the opening, and wherein the recessed portion exposes an adjacent segment of the output shaft.