US 12,246,346 B2
Drive control device and ultrasonic motor system
Mitsushiro Terasawa, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Dec. 22, 2022, as Appl. No. 18/086,816.
Application 18/086,816 is a continuation of application No. PCT/JP2021/029006, filed on Aug. 4, 2021.
Claims priority of application No. 2020-140130 (JP), filed on Aug. 21, 2020.
Prior Publication US 2023/0130784 A1, Apr. 27, 2023
Int. Cl. G02B 7/04 (2021.01); B06B 1/02 (2006.01); B06B 1/06 (2006.01)
CPC B06B 1/0215 (2013.01) [B06B 1/0644 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A drive control device for driving an ultrasonic motor element including a piezoelectric element, the drive control device comprising:
a voltage divider circuit formed by a voltage divider circuit unit resistor and an identification resistor that identifies the ultrasonic motor element;
a control circuit unit connected to the voltage divider circuit unit and configured to set a drive condition of the ultrasonic motor element based on a voltage of an identification signal that identifies the ultrasonic motor element; and
a drive circuit unit configured to apply a drive voltage to the piezoelectric element based on the drive condition set by the control circuit unit
wherein:
the control circuit unit is configured to set a sweep range of a drive frequency of the piezoelectric element,
the drive circuit unit is configured to sweep the drive frequency of the piezoelectric element within the sweep range of the drive frequency set by the control circuit unit, and
the control circuit unit is configured to set the drive condition based on a result of the sweep of the drive frequency.
 
13. A drive control device for driving an ultrasonic motor element including a piezoelectric element, the drive control device comprising:
a voltage divider circuit formed by a voltage divider circuit unit resistor and an identification resistor that identifies the ultrasonic motor element;
a control circuit unit connected to the voltage divider circuit unit and configured to set a drive condition of the ultrasonic motor element based on a voltage of an identification signal that identifies the ultrasonic motor element;
a drive circuit unit configured to apply a drive voltage to the piezoelectric element based on the drive condition set by the control circuit unit; and
an analog-to-digital conversion unit connected between the voltage divider circuit unit and the control circuit unit and configured to digitally convert the identification signal.
 
17. A method for driving an ultrasonic motor element including a piezoelectric element, the method comprising:
measuring an identification signal from an identification resistor that forms a voltage divider circuit with a voltage divider circuit unit resistor;
setting, by a control circuit unit coupled to the voltage divider circuit, a drive condition of the ultrasonic motor element based on a voltage of an identification signal that identifies the ultrasonic motor element;
applying a drive voltage to the piezoelectric element based on the drive condition set by the control circuit unit;
wherein the setting of the drive condition further comprises:
setting, by the control circuit unit, a sweep range of a drive frequency of the piezoelectric element;
sweeping the drive frequency of the piezoelectric element within the sweep range of the drive frequency set by the control circuit unit; and
setting, by the control circuit unit, the drive condition based on a result of the sweep of the drive frequency.