Ihi Corporation

Honda Motor Co., Ltd.

Ishikawajima-harima Heavy Industries Co., Ltd.

Takashi Majima

Junichi Kobayashi

Yuji Sasaki

Hiroyuki Abe

Narifumi Tojima

Seigo Murashige

Yuuji Sasaki

Yasuo Kobayashi

Mitsunao Sakamoto

Tetsuya Fukumoto

A redundant communication system includes a first control device which calculates a control command value of an electric power device, and outputs first and second command signals; a second control device which controls the electric power device on the basis of one of the first and second control command values; and primary and secondary communication lines for respectively transmitting the first and second command signals to the second control device. The second control device comprises: a primary communication line abnormality determining unit which determines that the primary communication line is abnormal when a non-reception state or an abnormality state of the first command signal continues during a predetermined period; and a control command value switching unit which selects one of the first and second control command values in a switching manner and switches the selection from the first to the second control command value within the predetermined period.

Redundant communication system

An object of the present invention to accurately and reliably detect rotational positions of a rotor irrespective of noise overlapping inductor voltage. Employed for accomplishing the aforementioned object in the present invention is a motor-driving device for rotating and driving a rotor by supplying predetermined drive signals to stator coils each corresponding to each phase of a DC brushless motor, the device comprising: a drive-signal-generating unit for generating the drive signals by switching direct current power based on a pulse-control signal; and a control-signal-generator unit for generating the pulse-control signal that controls the drive-signal-generating unit by intermittently generating the pulse-control signal; and for detecting the rotational position and the rotational velocity of the rotor based on inductor voltage obtained from the stator coils in a period in which generation of the pulse-control signal is suspended in each phase.

Motor-driving apparatus

A primary winding connected to a high-voltage, a large-current power supply , a secondary winding connected to an electromagnetic forming coil , and a magnetic core for guiding the magnetic flux produced by the primary winding. The magnetic core is composed of a primary core on which the primary winding is wound and a secondary core on which the secondary winding is wound. The primary core and the secondary core are magnetically connected in contact or in close proximity. The primary core and the secondary core are separated each other when the connector is disconnected. Thus, current pulses at a high voltage (for instance, 10 kV) with a large current (for example, 100 kA or more) and a narrow pulse width (e.g., 30 &mgr;sec or less) can be efficiently transmitted, and the connector easily attached and removed.

Electromagnetic connecting device for high voltage and large current

Growing community of inventors

Yokohama, Japan

Takashi Majima