Hitachi, Ltd.

Combi Corporation

Combi Co., Ltd.

Toyomi Yoshida

Takehiko Takahashi

Kazuyuki Yamaguchi

Michiyuki Takagi

Yohei Magara

Kenichi Murata

Takeshi Kudo

Naohiko Takahashi

Osami Matsushita

Kiyoshi Yabata

Ikuhiro Saitoh

Hiroyuki Keino

Kazuhisa Oshiro

The present invention is to reduce the load on a control device by reliably classifying vibration modes of a rotor, thereby facilitating stabilization design of a magnetic bearing. The present invention includes: magnetic bearings including electromagnets provided at one end and the other end of a rotor to contactlessly support the one end and the other end of the rotor by the magnetic attraction forces of the electromagnets; and displacement sensors that measure an inclination at the one end of the rotor and an inclination at the other end of the rotor, in which the magnetic attraction forces of the electromagnets are controlled based on the inclinations measured by the displacement sensors.

Control device for magnetic bearing and control method

A turbomachinery includes a labyrinth seal () to prevent unstable vibration of a rotor formed by dividing the seal into segments () in a circumferential direction and combining the segments () whose comb teeth () differ in height. The labyrinth seal () preferably includes two kinds of segments () whose comb teeth () differ in height for each kind of segment, and the segments () of the greater comb tooth height are arranged in a certain reference direction on a cross section right-angled to a rotational axis, and in a direction opposite to the reference direction, and the segments () of the smaller comb tooth height are arranged in a direction right-angled to the reference direction, and in a direction opposite to that right-angled to the reference direction.

Turbomachinery

In a mat switch, a plurality of switch regions for inputting the plurality of data are provided, each of the switch regions has a laminate structure which is formed by laminating an upper electrode sheet, a spacer, and a lower electrode sheet in the stated order; and a back board is provided below the lower electrode sheet in each of the switch regions. The backboards prevent the switch regions from being folded down.

Mat switch

Toy vehicle

A band pass filter multiplies an input waveform with first trigonometric functions at a plurality of frequencies and then filters the products. Furthermore, with that filtering step, the products are multiplied, or their phase is changed by a predetermined value, and the results are multiplied by the inverse of the trigonometric functions. The sum of this, for all frequencies, generated a filtered output waveform. Where the input waveform has two components, the corresponding outputs can be obtained from the read and imaginary components of the output waveform. In practice the trigonometric functions are produced by sine and cosine components at each frequency. In this way a band pass filter device is formed which is suitable for use in the control system of an apparatus which must be controlled continuously, such as a control system for a rotor.

Band pass filter device and a method of filtering using such a device

Growing community of inventors

Tokyo, Japan

Toyomi Yoshida