DC brushless vibration motor

A DC brushless vibration motor comprising:

• a stator comprising an upper magnetic pole piece, a lower magnetic pole piece and a stator field winding, said upper and lower magnetic pole pieces being disposed substantially coaxial with each other and forming a ring-shaped space, and said stator field winding being disposed within said ring-shaped space;
• a rotor with center of mass offset from the center axis of rotation and comprising a ring magnet and an eccentric weight, said ring magnet being disposed substantially coaxial with said rotor, said eccentric weight having a structural configuration of a ring body, and said ring magnet being securely fixed to the external peripheral surface of said eccentric weight;
• a drive circuit for controlling an electric driving current to said field winding for electromagnetically inducing said rotor to rotate;
• and
• a casing for securely housing said stator and said rotor while maintaining an air gap therebetween.

A DC brushless vibration motor comprising:

• a stator comprising an upper magnetic pole piece, a lower magnetic pole piece and a stator field winding, said upper and lower magnetic pole pieces being disposed substantially coaxial with each other and forming a ring-shaped space and having same number of a plurality of magnetic pole plates each radially facing the center of said stator along the periphery of said stator and mutually interleaving, and said stator field winding comprises a plurality of conductor coils wound around a bobbin reel and is contained in said ring-shaped space;
• a rotor having a center of mass offset from the center axis of rotation and comprising a ring magnet and an eccentric weight, said ring magnet being disposed substantially coaxial with said rotor, said eccentric weight having a structural configuration of the form of a partial ring body, the circumferential length of said partial ring body constituting the major portion of the circumferential length of a complete ring, and said ring magnet being securely fixed to the external peripheral surface of said eccentric weight;
• a drive circuit comprising a drive integrated circuit for controlling an electric driving current to said field winding for electromagnetically inducing said rotor to rotate by receiving an externally-supplied electric power;
• and
• a casing comprising a cylindrical cup and an end plate for securely housing said stator and rotor and further comprising a bearing means for supporting said rotor while maintaining an air gap therebetween.

A DC brushless vibration motor comprising:

• a stator comprising an upper magnetic pole piece, a lower magnetic pole piece and a stator field winding, said upper and lower magnetic pole pieces being disposed substantially coaxial with each other and forming a ring-shaped space and having same number of a plurality of magnetic pole plates each radially facing the center of said stator along the periphery of said stator and mutually interleaving, and said stator field winding comprises a plurality of conductor coils wound around a bobbin reel and is contained in said ring-shaped space;
• a rotor having a center of mass offset from the center axis of rotation and comprising a rotor frame, a ring magnet and an eccentric weight, said rotor frame and said ring magnet being disposed substantially coaxial with said rotor and having a recessed and ring-shaped space formed by an inward concave at one end along the longitudinal axis of said cylindrical body for securely containing said eccentric weight, and said ring magnet being securely fixed to the external peripheral surface of said rotor frame;
• a drive circuit comprising a drive integrated circuit for controlling an electric driving current to said field winding for electromagnetically inducing said rotor to rotate by receiving an externally-supplied electric power;
• and
• a casing comprising a cylindrical cup and an end plate for securely housing said stator and rotor and further comprising a bearing means for supporting said rotor while maintaining an air gap therebetween.

A DC brushless vibration motor comprising:

• a stator comprising an upper magnetic pole piece, a lower magnetic pole piece and a stator field winding, said upper and lower magnetic pole pieces being disposed substantially coaxial with each other and forming a ring-shaped space and having same number of a plurality of magnetic pole plates each radially facing the center of said stator along the periphery of said stator and mutually interleaving, and said stator field winding comprises a plurality of conductor coils wound around a bobbin reel and is contained in said ring-shaped space;
• a rotor having a center of mass offset from the center axis of rotation and comprising a ring magnet and an eccentric weight, said ring magnet being disposed substantially coaxial with said rotor and said eccentric weight having the basic configuration of a ring body, with a thick and sufficiently deep cut into said ring body on the peripheral surface along a selected radial direction to form a recessed space, and said ring magnet is securely fixed to the external peripheral surface of said eccentric weight;
• a drive circuit comprising a drive integrated circuit for controlling an electric driving current to said field winding for electromagnetically inducing said rotor to rotate by receiving an externally-supplied electric power;
• and
• a casing comprising a cylindrical cup and an end plate for securely housing said stator and rotor and further comprising a bearing means for supporting said rotor while maintaining an air gap therebetween.

A DC brushless vibration motor comprising:

• a stator comprising an upper magnetic pole piece, a lower magnetic pole piece and a stator field winding, said upper and lower magnetic pole pieces being disposed substantially coaxial with each other and forming a ring-shaped space and having same number of a plurality of magnetic pole plates each radially facing the center of said stator along the periphery of said stator and mutually interleaving, and said stator field winding comprises a plurality of conductor coils wound around a bobbin reel and is contained in said ring-shaped space;
• a rotor having a center of mass offset from the center axis of rotation and comprising a ring magnet and an eccentric weight, said ring magnet being disposed substantially coaxial with said rotor and said eccentric weight having the basic configuration of a ring body, with at least one hole formed in said ring body, said at least one hole being directed into said ring body in directions generally parallel to the center axis of rotor rotation and located asymmetrically with respect to said axis, and said ring magnet being securely fixed to the external peripheral surface of said eccentric weight;
• rotor is propelled to rotate by said stator;
• a drive circuit comprising a drive integrated circuit for controlling an electric driving current to said field winding for electromagnetically inducing said rotor to rotate by receiving an externally-supplied electric power;
• and
• a casing comprising a cylindrical cup and an end plate for securely housing said stator and rotor and further comprising a bearing means for supporting said rotor while maintaining an air gap therebetween.

A DC brushless vibration motor comprising:

• a stator comprising an upper magnetic pole piece, a lower magnetic pole piece and a stator field winding, said upper and lower magnetic pole pieces being disposed substantially coaxial with each other and forming a ring-shaped space and having same number of a plurality of magnetic pole plates each radially facing the center of said stator along the periphery of said stator and mutually interleaving, and said stator field winding comprises a plurality of conductor coils wound around a bobbin reel and is contained in said ring-shaped space;
• a rotor having a center of mass offset from the center axis of rotation and comprising a ring magnet and an eccentric weight, said ring magnet being disposed substantially coaxial with said rotor and said eccentric weight having the basic configuration of a ring body, with one end along the longitudinal axis being partially cut in a tilted plane to reveals an elliptical, or a portion of an elliptical contour, and said ring magnet being securely fixed to the external peripheral surface of said eccentric weight;
• a drive circuit comprising a drive integrated circuit for controlling an electric driving current to said field winding for electromagnetically inducing said rotor to rotate by receiving an externally-supplied electric power;
• and
• a casing comprising a cylindrical cup and an end plate for securely housing said stator and rotor and further comprising a bearing means for supporting said rotor while maintaining an air gap therebetween.