JPS645344A - Hollow motor - Google Patents

Abstract

PURPOSE:To reduce the inertial moment of a motor and to heighten its responsiveness, by providing rotors with multiple polarity between the pole surfaces of yoke edges. CONSTITUTION:A Hall element 11 generates the output and counter output different inphase at 180 deg. as a rotor 5 rotates, which will be formed into rectangular waves. In accordance with the output and counter output of this Hall element 11, current is supplied to each coil 7-10. The pole surfaces 1a-4a and 1b-4b of the opposite four poles are excited so that their polarity may be inverted one after anther against the rotation of rotors 5 and 6. The poles of rotors 5 and 6 are attracted to and from the pole surfaces 1a-4a and 1b-4b on the stator side each other, so that the rotors 5 and 6 will rotate clockwise. The rotating force of the rotors 5 and 6 is transmitted to a gear 25 on the load side through gears 23 and 24. Since the rotors 5 and 6 are provided as described above between the pole surfaces 1a-4a and 1b-4b of four poles provided to the ring yoke edges 1-4, the radii of the rotors 5 and 6 can be made small and the responsiveness of a motor itself is improved.