Azbil Corporation

Other

Hiroaki Narita

Makoto Saruwatari

Hideaki Someya

Takuji Abe

Tomofumi Ohashi

Yukio Nakanishi

Katsuhiko Kan

Naohiko Shimono

Akinori Ota

Yoshisato Miyakoshi

Kiyotaka Kawai

Kouichi Hagiwara

Toshiki Iijima

When interruption of electric service occurs, each of a number of electric actuators forcibly drives a motor using electric energy stored in an electricity storing portion and returns a valve to a predetermined opening position. When receiving a charge start command from a host device, each of the electric actuators starts the charging of the electricity storing portion. The host device divides the electric actuators into groups according to predetermined priority of charging and transmits charge start commands to the electric actuators for each of the groups in order of the priority.

Charge controlling system

A rotation control apparatus includes a relative position sensor that contactlessly detects the mechanical displacement amount of a shaft to be actuated in a direction of rotation, absolute position sensors that are provided at mutually different positions within a rotatable range of the shaft to be actuated and each output a detection signal when the shaft to be actuated has reached its corresponding position, and a position calculating unit that calculates an absolute position of the shaft to be actuated in the direction of rotation on the basis of an integrated value of the mechanical displacement amount since the detection signal is output and a reference value indicating a position corresponding to the absolute position sensor that has output the detection signal. At least one of the absolute position sensors is provided to correspond to a third position excluding a first position and a second position within the rotatable range.

Rotation control apparatus

An electric actuator comprises an electricity storing portion that stores electric energy, a charging portion that charges the electricity storing portion when the electric actuator is energized by receiving electric power from outside, and a controlling portion that controls the entire actuator. The controlling portion controls the opening degree of a valve according to an opening degree target value when the electric actuator is energized and operates the valve to a desired opening position using energy stored in the electricity storing portion when interruption of electric service occurs. In addition, the controlling portion causes the charging portion to start charging of the electricity storing portion when a charge waiting time that depends on predetermined priority of charging has elapsed after electric power is turned on.

Electric actuator with priortized charging for electric valve return

A power generating portion formed of a rotor and a stator is provided. The rotor is formed of a ring incorporating a permanent magnet and an impeller. The rotor is regarded as a turbine. An actual flow rate is estimated from a present angular velocity of the turbine and a present torque of the power generating portion, a torque of the power generating portion in which the estimated actual flow rate corresponds to a setting flow rate is calculated and the torque of the power generating portion is controlled based on the calculated torque and a magnetic pole position of the turbine. A measured value detected by a position sensor is used as the magnetic pole position of the turbine, however, when it is determined that reliability does not exist in the position sensor, an estimated value is used.

Turbine-type flow rate controlling device

A power generating portion formed of a rotor and a stator is provided. The rotor is formed of a ring incorporating a permanent magnet and an impeller. The rotor is regarded as a turbine. An actual flow rate of fluid flowing in a flow path is estimated from a present angular velocity of the turbine and a present torque of the power generating portion, a torque of the power generating portion in which the estimated actual flow rate corresponds to a setting flow rate is calculated and the torque of the power generating portion is controlled based on the calculated torque and a magnetic pole position of the turbine. The magnetic pole position of the turbine is estimated based on a present phase voltage value and a present phase current value of the power generating portion and a present winding temperature of the power generating portion.

A table indicating a relationship between a differential pressure across a valve unit and a torque that is to be outputted by a motor (an output torque) is stored in a table storing portion. A valve opening controlling portion and a torque controlling portion are provided in a controlling portion. The valve opening controlling portion uses the actual opening &#x3b8;pv, from the valve opening detector, as the valve opening measured value, and sends a driving command to the motor so as to cause the valve opening measured value &#x3b8;pv to match the valve opening setpoint &#x3b8;sp. The torque controlling portion acquires, from the table, a torque corresponding to the differential pressure &#x394;P across the valve unit, detected by the differential pressure detecting portion, and sends, to the motor, a command (a torque output command) to cause outputting of the torque that has been acquired.

Flow rate controlling valve

In a method for evaluating degradation of a potentiometer, a plurality of evaluation items, from minor to major, are established as evaluation items for degradation in performance prior to failure of a potentiometer. The degradation of the potentiometer in performance of the plurality of evaluation items is evaluated in terms of stages, in a specific sequence.

Potentiometer degradation evaluating method

An electric actuator includes a motor, an electricity storing body, a manual operating unit, a switch and a resetting unit. In a state wherein a controlled element has arrived at a first opening and a supply of power to the motor from the electricity storing body is cut off, the motor and the controlled element are in a non-linked state only while a button is pushed. The switch keeps a supply path of electric power open when the button has been pressed once. The resetting unit closes the switch at a point in time that the controlled element that is driven by the motor arrives at a specific second opening at a time of restoration of the external power supply in a state wherein the non-linked state of the motor and the controlled element by the button has been undone.

Electric actuator

A most recent electrostatic capacitance value for a backup capacitor is measured periodically. Each time the most recent electrostatic capacitance value is measured, a charging voltage (a required charging voltage) that is required in order to cause a return operation of a valve from the setting opening at that time to an emergency opening/closing position (for example, the fully closed position) is calculated based on the electrostatic capacitance value that has been measured, and the terminal voltage of the backup capacitor is adjusted so as to become equal to the calculated required charging voltage.

A most recent electrostatic capacitance value for a backup capacitor is measured periodically. Each time the most recent electrostatic capacitance value is measured, a charging voltage (a required charging voltage) that is required in order to cause a return operation of a valve from the setting opening at that time to an emergency opening/closing position (for example, the fully closed position) is calculated based on the electrostatic capacitance value that has been measured. If the required charging voltage that has been calculated is higher than the terminal voltage that has been detected, then a value for a charging current value is determined based on the actual degree of opening and the setting opening of the valve, and the backup capacitor is charged until the terminal voltage reaches the required charging voltage.

Sheet tobacco according to the present invention includes a carrier sheet made of nonwoven plant fibers, and a tobacco powder layer formed on the carrier sheet and containing a powder mixture of tobacco lamina powder and binder powder. In a sheet tobacco manufacturing process according to the present invention, a carrier sheet of plant fibers is formed by a nonwoven fabric production process, a tobacco powder layer is formed by spreading the powder mixture on the carrier sheet, and a cover sheet of plant fibers is optionally formed on the tobacco powder layer. Subsequently, the carrier sheet, the tobacco powder layer and the optical cover sheet are all together subjected to heating and pressing, thereby producing sheet tobacco with a two- or three-layer structure. The present invention also provides a manufacturing system for carrying out the sheet tobacco manufacturing process.

Growing community of inventors

Tokyo, Japan

Hiroaki Narita