Electric motor

Claim 2

An electric motor, comprising: (a) a casing; (b) magnet means mounted around the inner periphery of said casing; (c) an integral bearing member formed of suitable bearing material, said bearing member being secured on a first side wall of said casing to extend from said wall into said casing in the axial direction thereof; (d) a rotor positioned for rotation within the field of said magnet means, said rotor including: (1) a rotor shaft rotatably mounted in said bearing member; (2) an armature core formed by laminating a plurality of laminated plate members on a core support, said core support being disposed at one end of said armature core and secured to said rotor shaft, and said plate members each having a through-hole at the center thereof, and said plate members, through sequential lamination onto said core support, being secured to said rotor shaft and forming a concave portion to receive therein a part of said bearing member from a direction along said rotor shaft; (3) a winding wound around said armature core to pass through both end surfaces of said armature core, said windings forming concave regions on both end surfaces of said armature core owing to raised portions thereof extending beyond both end surfaces of said armature core; and (4) a disc-shaped commutator secured on said shaft, said commutator being disposed within one concave region formed at one end surface of said core where said concave portion is not formed; and (e) brush means resiliently contacting a part of said commutator, said brush means being fixed on a second side wall of said casing.

Claim 3

An electric motor comprising: (a) a stator having: (1) a main body casing in a cylindrical form, one end of which is open and the other end of which is closed; (2) a cover to close the opening in said main body casing; (3) magnets provided around the inner periphery of said main body casing; (4) an integral bearing member formed of suitable bearing material, said bearing member being secured to the wall of said main body casing opposite said cover to extend from said wall into said casing along the axial direction of said casing; (b) a rotor disposed within said main body casing for rotation in the field of said magnets, said rotor having: (1) a rotor shaft rotatably mounted in said bearing member; (2) an armature core formed by a plurality of laminate plate members on a core support, said core support being disposed at one end of said armature core and secured to said rotor shaft, and said plate members each having a through-hole at the center thereof, and said plate members, through lamination onto said core support, being secured to said rotor shaft and forming a concave portion to receive therein a part of said bearing member from a direction along said rotor shaft; and (3) a winding wound around said armature core to pass through both end surfaces of said armature core, said winding forming concave regions on both end surfaces of said armature core owing to raised portions thereof extending beyond both end surfaces of said armature core; and (4) a disc-shaped commutator secured on said shaft, said commutator being disposed within one concave region formed at the end surface of said core where said concave portion is not formed; and (c) brush means resiliently contacting a part of said commutator, said brush means being secured to the inner wall of said cover.

Claim 4

An electric motor comprising: (a) a stator having: (1) a main body casing in a cylindrical form, one end of which is open and the other end of which is closed; (2) a cover to close the opening in said main body casing; (3) magnets provided around the inner periphery of said main body casing; (4) an integral bearing member formed of suitable bearing material, said bearing member being secured to the wall of said main body casing opposite said cover to extend from said wall into said casing along the axial direction of said casing; (b) a rotor disposed within said main body casing for rotation in the field of said magnets, said rotor having: (1) a rotor shaft rotatably mounted in said bearing member; (2) an armature core formed by a plurality of laminate plate members on a core support, said core support being disposed at one end of said armature core and secured to said rotor shaft, and said plate members each having a through-hole at the center thereof, and said plate members, through lamination onto said core support, being secured to said rotor shaft and forming a concave portion to receive therein a part of said bearing member from a direction along said rotor shaft; and (3) a winding wound around said armature core to pass through both end surfaces of said armature core, said winding forming concave regions on both end surfaces of said armature core owing to raised portions thereof extending beyond both end surfaces of said armature core; and (4) a disc-shaped commutator secured on said shaft, said commutator being disposed within one concave region formed at the end surface of said core where said concave portion is not formed; and (c) brush means resiliently contacting a part of said commutator, said brush means being secured to the inner wall of said cover.