Okuma Corporation

Mitsubishi Aircraft Corporation

Toru Ando

Tomohisa Kameyama

Hiroyasu Aruga

Koji Eba

Zenji Hayakawa

Motohiko Kawaguchi

Masashi Fujimoto

Takafumi Nakatani

To provide a ceiling lighting apparatus of an aircraft which can improve maintainability. The ceiling lighting apparatus includes: a ceiling panelthat is provided so as to be erected and laid with respect to a ceiling structurethat constitutes a ceiling structure of the aircraft with a hingeas a rotation center; and a lightthat is provided in the ceiling panel. A mechanic can perform maintenance of the lightin a comfortable posture with the ceiling panelrotated to be suspended from a ceiling. Accordingly, the maintainability can be improved.

Ceiling lighting apparatus of aircraft and aircraft

A motor controller drives and controls a motor to drive a shaft subject to gravity. The motor controller includes a PI control unit which controls the velocity of the motor, a brake which prevents the falling of the shaft in accordance with a brake signal, and a storage unit which detects the brake signal input to the brake. On the basis of the state of the detected brake signal, the storage unit stores the torque command value when the brake signal has changed from off to on, and sets the stored torque command value to an integral component of the PI control unit when the brake signal has changed from on to off.

Motor controller

A synchronous motor control device having an optimal protection function in accordance with an operational state of a motor is provided. The motor control device includes a position detecting sensor detecting an angular position of a motor, a speed controller controlling the speed of the motor based on the angular position of the motor detected by the position detecting sensor, a temperature estimation component that estimates the temperature of the motor from a current command value calculated by the speed controller or a torque command value and, when the estimated temperature reaches a threshold, outputs a current cutoff signal to a current controller that cuts off passage of current to the motor, and an operational state determination part determining an operational state of the motor based on the angular position of the motor detected by the position detecting sensor, wherein the temperature estimation component changes the threshold based on the operational state of the motor determined by the operational state determination component.

Control device equipped with motor protection function

A device and an initializing method for use in a ring communication path, which can highly accurately synchronize time of the master and slave stations so as to achieve accurate communication among those stations. According to this device and method in which timers of respective slave stations connected to a ring communication path are synchronized using a specific communication frame, a master station recognizes the number of slave stations and their connection sequences, and notifies each of the slave stations of an individual communication delay time. Respective slave stations correct their timers so as to agree to that of the master station.

Growing community of inventors

Aichi, Japan

Toru Ando