Kokusan Denki Co., Ltd.

Katsumi Yamamoto

Masanori Nakagawa

Kaoru Shinba

Masahiko Endou

Yoshihiro Sugisawa

An inverter controlled generator set including: a power supply unit that uses a generator driven by an engine as a power supply to output a DC voltage; an inverter device that converts the output voltage of the power supply unit into an AC voltage; and a rotational speed control unit that controls a rotational speed of the engine so as to be kept at a target rotational speed suitable for a load applied to the inverter device, wherein the rotational speed control unit is comprised so that a settling time when the rotational speed of the engine is caused to converge to the target rotational speed in a state where the load is above a set value is longer than a settling time when the rotational speed is caused to converge to the target rotational speed in a state where the load is below the set value, in order to minimize an operation sound of the engine when the load is intermittently driven.

Inverter controlled generator set

A method for controlling an inverter controlled generator set which comprises a DC power source section having as a power source a generator driven by an engine and an inverter which converts an output of said DC power source section into an AC output, the method comprising a step of controlling a rotational speed of the engine so that the AC output suitable for driving a load is output from the inverter; wherein, after the engine is started, the rotational speed of the engine is controlled by a constant speed control mode for maintaining the rotational speed of the engine at a set rotational speed, and the rotational speed of the engine is increased to the set rotational speed; and wherein an operation of the inverter is started after the rotational speed of the engine reaches the set rotational speed.

Inverter controlled generator set and method for controlling the same

An inverter unit comprising component parts including at least an inverter and a filter which removes a high harmonic wave component from an output of said inverter, wherein said component parts are housed in an aluminum case having a bottom wall portion and a side wall portion, said filter includes a coil which is wound around a core extending straight and is arranged at a position closed to one end of said case, an end portion of said core being wound with said coil is arranged closed to an inner surface of said side wall portion of the case, and a ferromagnetic plate, which leads magnetic flux coming in and out said end portion of the core arranged closed to said wall portion of the case to the direction along the inner surface of the side wall portion of the case, is disposed between said end portion of said core and said inner surface of said side wall portion of the case.

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Numazu, Japan

Katsumi Yamamoto