公开(公告)号：US5043649A

公开(公告)日：1991-08-27

申请号：US456781

申请日：1989-12-28

Applicant: Fumiaki Murakami ,  Masahiko Suzuki ,  Masatoshi Kuroyanagi ,  Jirou Asai ,  Yoshimi Natsume ,  Akira Takagi ,  Kiyomitsu Kozawa

Inventor： Fumiaki Murakami ,  Masahiko Suzuki ,  Masatoshi Kuroyanagi ,  Jirou Asai ,  Yoshimi Natsume ,  Akira Takagi ,  Kiyomitsu Kozawa

IPC: F16N29/04 ,  H02K37/22 ,  H02P8/14

CPC classification number: H02K37/22 ,  F16N29/04 ,  H02P8/14

Abstract: A stepping motor unit includes a stepping motor of the type wherein the interior of the stepping motor is filled with an oil, a detector for detecting the temperature of the oil in the stepping motor, a device for varying an upper limiting value of the rotational speed of the stepping motor and an upper limiting value of the rotational acceleration of the stepping motor in view of a current viscous condition of the oil based on the temperature detected by the temperature detector, and a driver for driving the stepping motor at a rotational speed and a rotational acceleration which fall in ranges, respectively, not exceeding the upper limiting values. The stepping motor unit thus constructed has rapid and accurate response characteristics and is capable of operating reliably without falling out of step even when the environmental temperature varies in a very wide range. A rotary control valve incorporating such stepping motor unit is also disclosed.

Abstract translation: 步进电动机单元包括步进电机，其中步进电机的内部充满油，用于检测步进电机中的油的温度的检测器，用于改变转速的上限值的装置 考虑到基于由温度检测器检测到的温度的油的当前粘性状况，步进电动机的旋转加速度的上限值和用于以转速驱动步进电动机的驱动器，以及 分别落在范围内的旋转加速度不超过上限值。 如此构造的步进电动机单元具有快速且准确的响应特性，即使当环境温度在非常宽的范围内变化时也能够可靠地运行而不会失步。 还公开了一种结合了这种步进马达单元的旋转控制阀。

公开(公告)号：US5036263A

公开(公告)日：1991-07-30

申请号：US432677

申请日：1989-11-07

Applicant: Yasufumi Yamada ,  Yasutaka Nakamori ,  Kiyomitsu Kozawa ,  Yoshimi Natsume

Inventor： Yasufumi Yamada ,  Yasutaka Nakamori ,  Kiyomitsu Kozawa ,  Yoshimi Natsume

IPC: H01L41/09 ,  F02D41/20 ,  H01L41/04 ,  H02N2/06

CPC classification number: F02D41/2096 ,  H01L41/042 ,  F02D2041/2003

Abstract: Disclosed is a piezoelectric actuator driving apparatus in which a piezoelectric element used to operate as an electro-mechanical transducer is suitably charged and discharged so that the piezoelectric element can make a predetermined amount of mechanical displacement. In the apparatus, the energy of electric charge causing expansion of the piezoelectric element is controlled by a plurality of pulse signals. Each of these pulse signals acts to store electric charge having a predetermined amount of energy in a capacitor, so that the amount of electric charge stored in the capacitor increases with the increase in the number of the pulse signals. After the total amount of the energy of the electric charge stored in the capacitor attains a predetermined value sufficient to cause expansion of the piezoelectric element, the electric charge stored in the capacitor is supplied to the piezoelectric element. Thus, even when a high speed response and high energy are demanded for controlling the amount of expansion of the piezoelectric element, this demand can be readily dealt with. On the other hand, when the electric charge stored in the piezoelectric element is discharged, voltages applied to the piezoelectric element and the primary and secondary windings of a transformer are controlled so as to prevent deterioration of the piezoelectric element.

Abstract translation: 公开了一种压电致动器驱动装置，其中用作机电换能器的压电元件适当地进行充电和放电，使得压电元件可以进行预定量的机械位移。 在该装置中，通过多个脉冲信号来控制导致压电元件膨胀的电荷的能量。 这些脉冲信号中的每一个用于在电容器中存储具有预定量的能量的电荷，使得存储在电容器中的电荷量随着脉冲信号数量的增加而增加。 在存储在电容器中的电荷的总能量达到足以使压电元件膨胀的预定值之后，存储在电容器中的电荷被提供给压电元件。 因此，即使需要高速响应和高能量来控制压电元件的膨胀量时，也可以容易地处理该要求。 另一方面，当存储在压电元件中的电荷被放电时，控制施加到压电元件和变压器的初级和次级绕组的电压，以防止压电元件的劣化。