Abstract: A rotor unit of a brushless motor includes a substantially cylindrical rotor magnet and a rotor holder arranged to retain an outer circumferential portion of the rotor magnet. A stator unit of the same includes a stator core around which coils are wound and a Hall IC for sensing magnetic flux generated from the rotor magnet. The stator core includes teeth disposed at positions separated in the circumferential direction, each of which has an arm portion extending outward in the radial direction around which the coil is wound, and a stretching portion extending from the arm portion outward in the radial direction and in the circumferential direction on both sides.

Abstract: A rotor unit of a brushless motor includes a substantially cylindrical rotor magnet and a rotor holder arranged to retain an outer circumferential portion of the rotor magnet. A stator unit of the same includes a stator core around which coils are wound and a Hall IC for sensing magnetic flux generated from the rotor magnet. The stator core includes teeth disposed at positions separated in the circumferential direction, each of which has an arm portion extending outward in the radial direction around which the coil is wound, and a stretching portion extending from the arm portion outward in the radial direction and in the circumferential direction on both sides.

Abstract: In a brushless motor of the present invention, by disposing an electronic circuit board and a rotary magnet close to each other, detection precision of a magnetic pole of a Hall IC is enhanced, and a motor can be reduced in thickness. The electronic circuit board 4 is provided with an opening hole 41 and a notch portion 42 provided on an outer peripheral side of the opening hole 41. A lower insulator 32 of a stator 3 is provided with a positioning surface 32a with respect to the electronic circuit board 4 and an arc projection piece 32c. Portions of coil winding portions of teeth of the stator 3 are fitted into the electronic circuit board 4, a surface of the electronic circuit board 4 is brought into positioning against an positioning surface 32a of the lower insulator 32, and the notch portion 42 of the electronic circuit board 4 and the arc projection piece 32c of the lower insulator 32 are engaged with each other.

Abstract: In a brushless motor of the present invention, by disposing an electronic circuit board and a rotary magnet close to each other, detection precision of a magnetic pole of a Hall IC is enhanced, and a motor can be reduced in thickness. The electronic circuit board 4 is provided with an opening hole 41 and a notch portion 42 provided on an outer peripheral side of the opening hole 41. A lower insulator 32 of a stator 3 is provided with a positioning surface 32a with respect to the electronic circuit board 4 and an arc projection piece 32c. Portions of coil winding portions of teeth of the stator 3 are fitted into the electronic circuit board 4, a surface of the electronic circuit board 4 is brought into positioning against an positioning surface 32a of the lower insulator 32, and the notch portion 42 of the electronic circuit board 4 and the arc projection piece 32c of the lower insulator 32 are engaged with each other.