Brushless DC motor arrangement for reducing torque ripple

摘要

A Hall device that detects magnetic pole position of rotor magnet, is positioned adjacent to magnet so that its output signal has sine wave-like shape. A drive unit amplifies output signal of device, so that maximum value of exciting torque to excite motor coils, is twice than maximum value of cogging torque generated when rotor magnet faces stator core across uneven space.