Abstract: An air blower enabling efficient cooling is provided. The air blower (1) includes: an impeller (3); and a motor (5), wherein the impeller (3) includes a plurality of first blades (32) and a cup (33) arranged at the inner periphery side d of the plurality of first blades (32), the motor (5) includes a housing (51) arranged inside the cup (33), a stator (73), and a rotor (52) arranged inside the stator, and an outer peripheral surface (41c) of the cup (33) is provided with an opening part (43) facing an outer peripheral surface (51c) of the housing (51).

Abstract: An air blower enabling efficient cooling is provided. The air blower (1) includes: an impeller (3); and a motor (5), wherein the impeller (3) includes a plurality of first blades (32) and a cup (33) arranged at the inner periphery side d of the plurality of first blades (32), the motor (5) includes a housing (51) arranged inside the cup (33), a stator (73), and a rotor (52) arranged inside the stator, and an outer peripheral surface (41c) of the cup (33) is provided with an opening part (43) facing an outer peripheral surface (51c) of the housing (51).

Abstract: An electromagnetic clutch comprises a rotor rotatable with respect to the center of rotation, an armature facing the rotor with a clearance, a device for generating a magnetic attracting force between the rotor and the armature, a rotating member transmitting a driving force from the armature, and a plate spring for mounting the armature on the rotating member. The plate spring extends in a direction opposite to the center of rotation and has a first end separated from the center of rotation. The first end or a portion in the vicinity of the first end contacts an armature surface facing the rotor, and the plate spring is fixed to the rotating member at a portion other than the portion contacting the armature surface. The armature is supported such that the armature is urged to be separated in a direction opposite to the rotor by an elasticity of the plate spring.

Abstract: An electromagnetic clutch comprises a rotor rotatable with respect to the center of rotation, an armature facing the rotor with a clearance, a device for generating a magnetic attracting force between the rotor and the armature, a rotating member transmitting a driving force from the armature, and a plate spring for mounting the armature on the rotating member. The plate spring extends in a direction opposite to the center of rotation and has a first end separated from the center of rotation. The first end or a portion in the vicinity of the first end contacts an armature surface facing the rotor, and the plate spring is fixed to the rotating member at a portion other than the portion contacting the armature surface. The armature is supported such that the armature is urged to be separated in a direction opposite to the rotor by an elasticity of the plate spring.