Bilateral rotation ultrasonic motor driven by single electric signal

The utility model discloses a bilateral rotation ultrasonic motor driven by single electric signals; the motor comprises two identical stators, a rotor and a positive pressure pretightening force adjusting mechanism; the stator comprises a mandrel, and a rear cover, piezoelectric ceramics sheets, electrode sheets, and an oval vibration modal converter sleeved on the mandrel in sequence; the rotor comprises a friction disc and a bearing; and the positive pressure pretightening force adjusting mechanism comprises a spring and a support structure. The oval vibration modal converter structure is specially designed; oval locus motions of stator driving teeth end face mass points are realized through vertical vibration of the piezoelectric ceramics sheets; and the two stators respectively work to drive the rotor for bilateral continuous rotation motions. The bilateral rotation ultrasonic motor driven by single electric signals is simple in structure, easy to make, easy to be miniaturized and integrated, low in cost, small in control difficulty, and wide in application prospect.