Drive control device and drive control method that enable stable output to be obtained from vibration type actuator, vibration type drive device including vibration type actuator, and apparatus
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United States of America Patent
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May 30, 2023
Grant Date -
Jul 29, 2021
app pub date -
Apr 15, 2021
filing date -
Oct 15, 2018
priority date (Note) -
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Abstract
A drive control device 100, which controls driving of a vibration type actuator 200 including a vibrator 214 that includes a piezoelectric element 203, and a rotor 207, includes amplifier circuits 11 and 12 amplifying a power supply voltage to generate a drive voltage to be applied to the piezoelectric element 203, and a microcomputer unit 1. The microcomputer unit 1 performs a control to increase the amplitude of the drive voltage to perform acceleration from when the vibration type actuator 200 is started to when a target speed of the rotor 207 is reached, decrease the frequency of the drive voltage without changing the amplitude of the drive voltage when power supplied to the piezoelectric element 203 exceeds a first power limit P-Lim1, and increase the amplitude of the drive voltage when the power falls below a second power limit P-Lim2 during an operation of decreasing the frequency.
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