Linear ultrasonic motor stator and electric excitation method thereof

• Main Authors: QU JIANJUN, QU HUAJIE, WEN ZHONGPU
• Format: Patent
• Language: Chinese; English
• Published: 28.07.2020
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION

The invention discloses a linear ultrasonic motor stator and an electric excitation method thereof. The stator comprises a stator elastic body and piezoelectric ceramic pieces, wherein an open slot isformed in the stator elastic body along the length direction, and the stator elastic body is divided into a driving body and two symmetrical driving legs by the open slot; the piezoelectric ceramic pieces in axial symmetry are attached to the two opposite outer side surfaces of the two driving legs, and driving feet extending outwards are arranged at the upper ends of the two driving legs respectively; and the piezoelectric ceramic pieces are coated with an electrode layer. The electric excitation method comprises the steps of 1) bonding the piezoelectric ceramic pieces; 2) preparing electrifying electrodes; and 3) simultaneously exciting local second-order bending vibration of the driving legs and overall first-order longitudinal vibration of the stator twice by using two paths of same-frequency sinusoidal volta