| 摘要 |
PURPOSE:To drive a resilient body stably by performing polarization so that only one traveling wave is produced at the linear part of the resilient body in two-phase driving of an electromechanical energy converting element. CONSTITUTION:In two-phase driving of a piezoelectric element 2, polarization is performed so that only one traveling wave is formed at the linear part of a resilient body 1. The linear part of the resilient body 1 and a rail type stator 8 pressure jointed to the linear part always contact at the antinode of one traveling wave without separating from each other. Consequently, the resilient body 1 can be driven with stable contact state between the resilient body 1 and the rail type stator B being maintained. Lowering of motor efficiency due to slip loss on the sliding face can also be suppressed, while simultaneously noise can be suppressed. In particular, polarization is carried out so that piezoelectric elements 2a1, 2a2 are provided respectively with + and - polarities in one driving phase while piezoelectric elements 2b1, 2b2 are provided respectively with + and - polarities in the other driving phase. |
