| 摘要 |
Improved brushless direct current (DC) motor for use in various applications, including disk drives in data processing applications. The improved motor includes a rotor portion (12), containing a ring magnet (22) with alternately radially polarized zones (24), a shaft portion (26), a stator portion (16) having a stator stack (30), and conducting windings (32) and power and control circuitry (18). The stator stack (30) includes a plurality of poles (40), each pole having a greater amount of magnetic material at one end (44) than the other end (45). The structure of the stator stack poles (30) urges the rotor portion (12) to detent positions from which it is magnetically driven to rotation upon application of winding current and further urges rotation upon current application regardless of rotor position. The improved motor provides an economical, reliable starting rotation motor which functions in an unimpeded fashion at normal operating speeds and is adaptable as a rotational motion source for a variety of applications. |
