초록 ▼

This invention provides a two-phase motor which is applicable to a field where high rotation precision is required as in an FDD spindle motor, which requires a low cost, and which can maintain stable characteristics free from magnetic balance fluctuation between the two phases due to assembly. This

This invention provides a two-phase motor which is applicable to a field where high rotation precision is required as in an FDD spindle motor, which requires a low cost, and which can maintain stable characteristics free from magnetic balance fluctuation between the two phases due to assembly. This motor has a ferromagnetic stator having N stator salient poles and a rotor magnet having M poles. N and M are selected to be both even numbers so a relation N:M=2:2n-1 (n is a natural number) holds. The N stator salient poles are divided into first and second salient pole groups of N/2 stator salient poles on which windings are concentratedly wound. The stator salient poles belonging to the first and second salient pole groups are alternately arranged in the circumferential direction of the stator. The phases of the windings of the stator salient poles belonging to the first and second salient pole groups are sequentially opposite to each other in the circumferential direction in units of groups. The windings of the stator salient poles belonging to the first and second salient pole groups are sequentially, electrically connected in the circumferential direction in units of groups to respectively form first and second phases, thereby providing a two-phase arrangement.

대표청구항 ▼

[ What we claim is:] [1.] A two-phase synchronous motor of radial gap structure comprising a ferromagnetic stator having N stator salient main poles and zero sub-poles, and a rotor magnet having M poles,wherein N and M are selected to be both even numbers so a relation N:M=2:2n-1 (n is a natural num

[ What we claim is:] [1.] A two-phase synchronous motor of radial gap structure comprising a ferromagnetic stator having N stator salient main poles and zero sub-poles, and a rotor magnet having M poles,wherein N and M are selected to be both even numbers so a relation N:M=2:2n-1 (n is a natural number) holds,said N stator salient main poles of said ferromagnetic stator are divided into first and second salient pole groups of N/2 stator salient poles on which windings are concentrically wound, each of said windings being wound around a lamination yoke made of soft magnetic material,said stator salient main poles belonging to said first and second salient pole groups are alternatively arranged in a circumferential direction of said stator,phases of said windings of said stator salient main poles belonging to said first and second salient pole groups are sequentially opposite to each other in the circumferential direction in units of groups, andsaid windings of said stator salient main poles belonging to said first and second salient pole groups are sequentially, electrically connected in the circumferential direction in units of groups to respectively form first and second phases, thereby providing a two-phase synchronous radial gap motor arrangement.