A motor assembly comprising: a housing with an air inlet port; an impeller (130, 230) provided inside the housing so as to generate a suction force at the air inlet port of the housing; a motor (170, 270) including a rotor, provided to be rotated together with the impeller, and a pair of stators (180, 280) disposed so as to face each other across the rotor while electromagnetically interacting with the rotor to rotate the rotor; and a motor housing provided inside the housing arranged to fix the pair of stators relative to the rotor; a motor module (140, 240) is provided on a rear surface of the impeller and including the motor and motor housing, and further including: arrangement regions (188, 292) that are provided along lateral sides of the pair of stators disposed in a lengthwise direction; and a circuit board (196, 298) comprising electrical elements, wherein the electrical elements are disposed in one of the arrangement regions, wherein the circuit board (196, 298) is configured to transmit electric signals to the motor and is disposed perpendicular to an axial direction of the rotor inside the housing; wherein the impeller, the motor, and the circuit board are sequentially disposed inside the housing, such that the circuit board (196, 298) is provided on a rear surface of the motor housing and the impeller (130, 230) is provided on a front surface of the motor housing. a housing with an air inlet port; an impeller (130, 230) provided inside the housing so as to generate a suction force at the air inlet port of the housing; a motor (170, 270) including a rotor, provided to be rotated together with the impeller, and a pair of stators (180, 280) disposed so as to face each other across the rotor while electromagnetically interacting with the rotor to rotate the rotor; and a motor housing provided inside the housing arranged to fix the pair of stators relative to the rotor; a motor module (140, 240) is provided on a rear surface of the impeller and including the motor and motor housing, and further including: arrangement regions (188, 292) that are provided along lateral sides of the pair of stators disposed in a lengthwise direction; and a circuit board (196, 298) comprising electrical elements, wherein the electrical elements are disposed in one of the arrangement regions, wherein the circuit board (196, 298) is configured to transmit electric signals to the motor and is disposed perpendicular to an axial direction of the rotor inside the housing; wherein the impeller, the motor, and the circuit board are sequentially disposed inside the housing, such that the circuit board (196, 298) is provided on a rear surface of the motor housing and the impeller (130, 230) is provided on a front surface of the motor housing. arrangement regions (188, 292) that are provided along lateral sides of the pair of stators disposed in a lengthwise direction; and a circuit board (196, 298) comprising electrical elements, wherein the electrical elements are disposed in one of the arrangement regions, wherein the circuit board (196, 298) is configured to transmit electric signals to the motor and is disposed perpendicular to an axial direction of the rotor inside the housing; wherein the impeller, the motor, and the circuit board are sequentially disposed inside the housing, such that the circuit board (196, 298) is provided on a rear surface of the motor housing and the impeller (130, 230) is provided on a front surface of the motor housing.