Sumida Corporation

Kokusai Keisokuki Kabushiki Kaisha

Honda Giken Kogyo Kabushiki Kaisha

Hiroki Miura

Hiroyuki Miyazaki

Masaki Saito

Keiichi Ichikawa

Tadayuki Fushimi

Hironobu Takahashi

Yasunori Yamazaki

Joseph Makin

Eiji Tamura

To greatly improve the productivity, the general versatility, the downsizing, the performance and the like, as compared to those of the conventional transformer, provided is a transformer including: a core; a primary winding; a secondary winding; a bobbin provided with a low voltage side coil winding portion and a high voltage side coil winding portion, wherein the secondary winding is wound onto each of the coil winding portions; and a casing disposed so as to cover an outer periphery of the bobbin, wherein the primary winding is wound onto a portion of an outer periphery of the casing corresponding to a position of the low voltage side coil winding portion.

Transformer

The present invention provides a transformer apparatus configured by integrating an inverter transformer and balance transformer to be a downsized form, and a drive circuit using the transformer apparatus. The transformer apparatus comprises an inverter transformer having a core potion on which a primary coil and a secondary coil are wound, and a balance transformer having a core portion on which a primary coil and a secondary coil are wound, wherein the inverter transformer and the balance transformer are integrally formed by sharing a part of the core portions.

Transformer apparatus, inverter transformer, and drive circuit

A leakage transformer includes a primary winding; a secondary winding wound at a part on an extension of a winding part of the primary winding separately from the primary winding and having a coil sectional area smaller than that of the primary winding; a center core part composed of two core members and linearly extending through the primary winding and the secondary winding; and a peripheral core part formed by extending part of the two core members at the center core part and forming a magnetic path on the outer side of the primary winding and the secondary winding.

Leakage transformer

Measurement is made of centrifugal force produced on a crankshaft to be tested that is being rotated about its rotation axis, to provide centrifugal force variation information of the crankshaft. Also, measurement is made of errors in respective rotational phases of crankpins of the crankshaft about rotation axes of the crankpins. Dummy information, comprising rotational unbalance data representative of rotational unbalance components to be removed from the centrifugal force variation information of the crankshaft, is created using the measured errors in the respective rotational phases. Then, an initial rotational unbalance value of the crankshaft is determined, using the dummy information and the centrifugal force variation information of the crankshaft.

Apparatus and method for testing rotational balance of crankshaft

Balancing apparatus that supports and rotates a body to be measured with a rotating mechanism so that the body vibrates due to the dynamic imbalance thereof. The vibration of the body is transmitted to a vibration member and then detected by a sensor. A vibrator is connected to the vibration member. The vibrator applies to the vibration member a vibration that is an inverse of a vibration that will be generated in the vibration member by an ideal body having an ideal dynamic imbalance. By detecting the vibration remaining in the vibration member, the balancing apparatus measures the deviation of the dynamic imbalance of the body from the ideal dynamic imbalance.

Balancing apparatus

A method and an apparatus for accurately measuring an initial imbalance deviating from a predetermined imbalance, when the predetermined imbalance is to be left in a body of rotation. In the method and apparatus, data relating to the predetermined imbalance is stored in a memory as dummy value information. The vibration of a crank shaft during rotation is detected by vibration sensors L, R to obtain analogue vibration signals WDL, WDR. The rotational angle position of the crank shaft is detected by a photo sensor and, in response, the above described dummy value information is converted to analogue dummy signals DLX, DLY, DRX and DRY by multi D/A converters L, R, L and R. These analogue dummy signals are removed from the analogue vibration signals to obtain analogue initial imbalance signals WL, WR, which are converted by D/A converter to obtain the digital initial imbalance value.

Growing community of inventors

Tokyo, Japan

Hiroki Miura