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公开(公告)号：US4473856A
公开(公告)日：1984-09-25
申请号：US335358
申请日：1981-12-29
CPC分类号： H02H7/0833
摘要： An overcurrent protection apparatus for a DC motor which can be used with a speed control system of a DC motor to prevent an overcurrent condition arising when the DC motor is run with a heavy load or locked by an overload from burning or overheating windings of the motor. The apparatus is constructed using at least one integrated circuit and includes a current mirror circuit for detecting an overcurrent and for cutting off the supply current of the DC motor. A timing circuit prevents overcurrents lasting only a short time from triggering the apparatus to shut down the motor. Once the apparatus is triggered to shut off the motor, the motor will remain off for an indefinite period of time until the apparatus is reset.
摘要翻译： 一种用于直流电动机的过电流保护装置，其可与直流电动机的速度控制系统一起使用，以防止当直流电动机由重负载运行或被电动机的燃烧或过热绕组过载锁定时产生的过电流条件 。 该装置使用至少一个集成电路构造，并且包括用于检测过电流并用于切断直流电动机的供电电流的电流镜电路。 定时电路可防止持续时间短的过电流触发装置关闭电机。 一旦设备触发关闭电机，电机将保持关闭无限期，直到设备复位为止。
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公开(公告)号：US5021700A
公开(公告)日：1991-06-04
申请号：US410035
申请日：1989-09-21
摘要： A driving apparatus for an ultrasonic motor which generates a driving force by using a piezoelectric member, wherein an oscillation frequency fd is varied so as to follow a driving frequency fm which is particular to a mechanical resonance frequency fro when the mechanical resonance frequency fro varies by influence of environment. For this purpose, current and voltage detectors are provided for respectively detecting the current corresponding to the mechanical vibration of the piezoelectric member and the voltage impressed on the piezoelectric member. The phase difference between the detected current and voltage is detected, and this phase difference is used to drive a variable frequency oscillator so as to maintain the phase difference constant. The output of the variable frequency oscillator is then used to drive the driving circuit for the piezoelectric member of the ultrasonic motor.
摘要翻译： 一种用于通过使用压电元件产生驱动力的超声波马达的驱动装置，其中振荡频率fd变化，以便遵循当机械共振频率变化时的机械共振频率特定的驱动频率fm 环境影响。 为此，提供电流和电压检测器，用于分别检测与压电元件的机械振动相对应的电流和压在压电元件上的电压。 检测检测到的电流和电压之间的相位差，并且该相位差用于驱动可变频率振荡器，以保持相位差恒定。 然后，可变频率振荡器的输出用于驱动超声波马达的压电元件的驱动电路。
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公开(公告)号：US4853578A
公开(公告)日：1989-08-01
申请号：US141036
申请日：1988-01-05
摘要： In a driving circuit for a piezoelectric ultrasonic motor (23) supplying driving signal from an astable oscillator (51), which comprises an oscillation IC (49), a capacitor (48) and charge-discharge resistors (45, 46, 47), is controlled by controlling leakage current through a leakage resistor (47) to a point E, through controlling of the voltage of the point E by a temperature-dependent voltage producing circuit 52.
摘要翻译： 在由包括振荡IC（49），电容器（48）和充放电电阻（45,46,47）的异常振荡器（51）提供驱动信号的压电超声波马达（23）的驱动电路中， 通过控制通过温度相关的电压产生电路52的点E的电压，通过泄漏电阻器（47）将泄漏电流控制到点E来控制。
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公开(公告)号：US4833359A
公开(公告)日：1989-05-23
申请号：US143093
申请日：1988-01-12
摘要： In a driving apparatus for an ultrasonic motor, which motor has a stator comprising a pair of piezoelectric members for generating travelling mechanical vibrations, the driving apparatus has an oscillator, a phase shift circuit, and delay circuits. By deferring phases of two control signals for two switching devices, there is no fear of dangerous simultaneous turn-ons of the switching devices.
摘要翻译： 在一种用于超声波电动机的驱动装置中，该电动机具有包括用于产生行进机械振动的一对压电元件的定子，该驱动装置具有振荡器，相移电路和延迟电路。 通过推迟两个开关装置的两个控制信号的相位，不必担心开关装置的同时导通。
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