초록 ▼

A brush-less DC motor includes a stator member; a stationary cylindrical member projected from the stator member and having bearings on its inner circumferential surface; a rotary shaft being rotatably supported by the bearings of the stationary cylindrical member; a rotary cylindrical member into w

A brush-less DC motor includes a stator member; a stationary cylindrical member projected from the stator member and having bearings on its inner circumferential surface; a rotary shaft being rotatably supported by the bearings of the stationary cylindrical member; a rotary cylindrical member into which the stationary cylindrical member is inserted, and to which the rotary shaft is fixed; two rotary discs of magnetic material, fixed to the rotary cylindrical member and spaced from each other; a permanent magnet fixed to one of the rotary discs; a rotational-position detecting member; and a coil assembly including a plurality of coil units. The working point of the rotary shaft is nearer to the stationary cylindrical member than to the rotary cylindrical member.

대표청구항 ▼

A brush-less DC motor comprising: magnetic means constituting a stator member; a stationary cylindrical member projecting from said stator member and having bearings on the inner surface of said stationary cylindrical member; a rotary shaft rotatably supported by said bearings in the stationary cyli

A brush-less DC motor comprising: magnetic means constituting a stator member; a stationary cylindrical member projecting from said stator member and having bearings on the inner surface of said stationary cylindrical member; a rotary shaft rotatably supported by said bearings in the stationary cylindrical member and extending axially from the opposite ends of the latter; a rotor assembly including a rotary cylindrical member into which said stationary cylindrical member is inserted and being fixed to said shaft at a portion of the latter extending axially from one of said ends of the stationary cylindrical member, at least two axially spaced apart rotary discs of magnetic material fixed to said rotary cylindrical member, and a permanent magnet fixed to at least one of said rotary discs so as to leave an axial space between the latter; a rotational-position detecting member extending into said space; and a coil assembly including a plurality of coil units and also extending into said space; said shaft having a working poriton extending from the other of said ends of the stationary cylindrical member so as to be relatively close to said bearings for stable acceptance by the latter of lateral loads applied to said working portion of the shaft.