发明名称 DRIVE CONTROL DEVICE OF ULTRASONIC MOTOR
摘要 PURPOSE:To prevent temperature drop while the drive of an ultrasonic motor is at halt in a state where a still torque can be obtained. CONSTITUTION:A temperature sensor 17 detects the temperature around an ultrasonic motor 1, the detection signal T is compared with a reference value Tr by temperature comparison 18, and the comparison result is outputted to a switch control 25. The switch control part 25 connects switches 14 and 15 to terminals 14c and 15c when T is smaller than Tr and at the same time turns on a switch 20. A synchronization switcher 22 alternately switches a switch 21 for every one period of one signal of bi-phase signals outputted from a phase-shifting circuit 13 and supplies an AC signal alternately to a pair of piezoelectric bodies 2a and 2b of the ultrasonic motor 1, thus increasing the temperature of the ultrasonic motor 1.
申请公布号 JPH0833367(A) 申请公布日期 1996.02.02
申请号 JP19940186445 申请日期 1994.07.15
申请人 ANRITSU CORP 发明人 TOMIOKA HIDEO;TAKASUGI KOSHI
分类号 H02N2/00 主分类号 H02N2/00
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