Hitachi, Ltd.

Hirokazu Nagura

Hiromi Inaba

Yoshitaka Iwaji

Junnosuke Nakatsugawa

Atsuya Fujino

Sadao Hokari

Norihisa Iwasaki

Hironori Ohashi

Toshifumi Yoshikawa

Masaki Sugiura

Yuri Takano

The present invention relates to an AC motor control device and, particularly, to provide an AC control device capable of simply setting a state quantity of an AC motor non-linearly variable, in accordance with the motor driving state and using the setting in motor control, the present invention can be achieved by including a state quantity calculating unit () for calculating a state quantity corresponding to a coil interlinkage flux which is an internal quantity of the motor, calculating a setting value of the coil interlinkage flux defined on one axis out of two axes, that is, d and q axes, with a function formula using a current defined on the same one of the axes and a function formula using a state variable defined on the other one of the axes.

AC motor control device and AC motor driving system

The start timing of the pole position inference process of the linear motor installed vertically is delayed by a predetermined time after instruction of brake release. For example, from (1) increasing of the thrust instruction value of an ASR control system up to a predetermined value, (2) the movement (falling) distance of the moving part, or (3) the moving (falling) speed of the moving part, the release condition of the brake is detected and moreover after a predetermined time, the inference process of the pole position is started. The inference process of the pole position of a synchronous motor is fit to the release timing of a brake and a malfunction of the inference process and a runaway (falling in the vertical drive) of a moving part are prevented.

Control apparatus and method for linear synchronous motor

The number of electrical wires in the car is reduced by radio communications between the operation panel and terminal. Furthermore, reliability and dependability of communications are improved because the operation panel and terminal communicate with each other at a comparatively short distance.

Elevator communications apparatus

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Hitachi, Japan

Hirokazu Nagura