| 摘要 |
A motor has a rotor 12 which is consrained relative to a stator 10 in all directions other than the sense of relative motion of the rotor and the stator by means of two sets of six impulsion elements 16A, 16B. Each impulsion element comprises a support element 20 which is mounted to the stator via an actuator made up of two piezoelectic elements 22. The actuator is operable to cause the support element to execute a circular motion to urge the rotor to rotate relative to the stator. The sets of impulsion elements are driven in antiphase with each other so that while one set of impulsion elements urges the rotor in a circular path relative to the stator, the other set of impulsion elements is in a recovery part of its oscillation cycle. The motor has the advantages of providing substantially friction-free operation, and good positional control. <IMAGE> |
