公开(公告)号：US6163100A

公开(公告)日：2000-12-19

申请号：US216945

申请日：1998-12-21

申请人： Satoshi Morizaki ,  Hiroyuki Furukoshi ,  Masao Nakada ,  Kazutomo Kakegawa

发明人： Satoshi Morizaki ,  Hiroyuki Furukoshi ,  Masao Nakada ,  Kazutomo Kakegawa

IPC分类号： H01L41/04 ,  H02N2/14 ,  H02N2/00

CPC分类号： H02N2/14 ,  H02N2/147

摘要： A microcomputer outputs a driving frequency signal to an oscillator circuit and the oscillator circuit oscillates at a driving frequency designated by the microcomputer. A switching control circuit outputs switching signals to an A-phase amplifier circuit and to a B-phase amplifier circuit at a predetermined timing. The A-phase amplifier circuit and the B-phase amplifier circuit each convert a DC voltage supplied by a voltage control circuit to an AC voltage and supply the same to two piezoelectric bodies of an ultrasonic motor. Due to the AC voltage being supplied to each of the two piezoelectric bodies, the ultrasonic motor is driven. At the start time of driving the ultrasonic motor, by gradually increasing the voltage level of the DC voltage outputted from the voltage control circuit and also gradually increasing the voltage level of a driving voltage to be supplied to the piezoelectric body of the ultrasonic motor, a stator and a rotor of the ultrasonic motor are gradually separated from each other. Further, in a case in which the voltage has been increased to a predetermined voltage level, the driving frequency is gradually lowered to increase the number of revolutions of the motor, thereby making it possible to lessen the vibration of the ultrasonic motor at the start time of driving. As a result, the generation of an audible sound can be prevented.

摘要翻译： 微型计算机向振荡电路输出驱动频率信号，并且振荡器电路以由微计算机指定的驱动频率振荡。 开关控制电路以预定的定时将开关信号输出到A相放大器电路和B相放大器电路。 A相放大电路和B相放大电路将由电压控制电路提供的直流电压转换为交流电压，并将其提供给超声波马达的两个压电体。 由于向两个压电体中的每一个供给交流电压，所以驱动超声波马达。 在驱动超声波电动机的开始时，通过逐渐增加从电压控制电路输出的直流电压的电压水平，并且逐渐增加提供给超声波电动机的压电体的驱动电压的电压电平， 定子和超声波马达的转子逐渐分离。 此外，在电压已经增加到预定电压电平的情况下，驱动频率逐渐降低以增加电动机的转数，从而可以在起始时间减小超声波电动机的振动 的驾驶 结果，可以防止产生可听见的声音。

公开(公告)号：US5510684A

公开(公告)日：1996-04-23

申请号：US349492

申请日：1994-12-02

申请人： Hidehiro Moroi ,  Kazutomo Kakegawa

发明人： Hidehiro Moroi ,  Kazutomo Kakegawa

IPC分类号： B60S1/08 ,  H02P3/00

CPC分类号： B60S1/08 ,  Y10S318/02

摘要： A drive control circuit includes a first and a second relays, each of which selectively connects one of the terminals of a motor with a power supply. A power connecting circuit can connect the power supply with each one of the relays. A control circuit controls the power connecting circuit to disconnect the power supply from the first and second relays, and then controls to switch the connecting arrangements between the power supply and each terminal of the motor utilizing the first and second relays. Therefore, the rotational direction of the motor is switched, or the rotation of the motor is stopped.

摘要翻译： 驱动控制电路包括第一和第二继电器，每个继电器选择性地将马达的端子中的一个与电源连接。 电源连接电路可以将电源与每个继电器连接。 控制电路控制电源连接电路，从第一和第二继电器断开电源，然后利用第一和第二继电器控制电源与电动机每个端子之间的连接配置。 因此，马达的旋转方向被切换，或马达的旋转停止。