Radial gap, rotary yoke type brushless vibration motor

Abstract

A radial gap, rotary yoke type brushless vibration motor which is driven by a sensor-less method includes a support body having a flat installation portion, a cylindrical coreless stator coil, one end of which is supported at the support body and the other end of which is open, a plurality of terminal portions arranged at the support body for connecting to the end of the cylindrical coreless stator coil at the support body, a shaft supported at the center of the support body, a cylindrical rotary yoke, functioning as an eccentric rotor supported by the shaft, accommodated inside the cylindrical coreless stator coil and separated from the cylindrical coreless stator coil via a radial gap, a rotor case, one end of which is fixed at the cylindrical rotary yoke, the rotor case made with a cut-out portion so as to be eccentric, and a magnet arranged inside the rotor case so as to face the outer circumference of the cylindrical coreless stator coil, the magnet separated from the cylindrical coreless stator coil via a radial gap.

Dependencies are inferred from the claim text.