Kabushiki Kaisha Yaskawa Denki

Koji Higashikawa

Kenji Yamada

Katsutoshi Yamanaka

Kenji Tomohara

Tasuku Isobe

Tomohiro Kawachi

Masashi Takenouchi

Hidenori Hara

Masato Higuchi

Tsuneo Joe Kume

Takayuki Morihara

Yasuhiko Kawanami

Akira Sasaki

Katsushi Terazono

Tetsuya Ito

Kiyonori Koguma

Takashi Aoki

Zhenning Chen

Fumiaki Ikeda

Aiko Higuchi

Yukihisa Nakabayashi

Tomohiko Sanada

A drive unit includes: an inverter; an electric motor that has a first winding connected to an output part of the inverter and a second winding connected to the first winding; a first semiconductor switch that has a first end connected to the first winding and a second end connected to the second winding; a second semiconductor switch that has a first end and a second end connected to the first winding and the first semiconductor switch; and a snubber circuit that is provided between the second end of the first semiconductor switch and the first end of the second semiconductor switch and has a capacitor and a diode.

Drive unit and transport machine

An inverter device includes a power supply unit and a switch controller. The power supply unit supplies AC power to an AC motor whose electric characteristics in response to a rotation speed are switchable between low speed characteristics and high speed characteristics. The switch controller switches the electric characteristics of the AC motor. The switch controller executes switching control that alternately switches the electric characteristics of the AC motor between the low speed characteristics and the high speed characteristics on the basis of the rotation speed of the AC motor.

Inverter device and motor drive system

A winding switching signal generator is configured to obtain information indicating a degree of field weakening from at least one of a current command calculator and a constant output controller, and to generate a winding switching signal for switching from a low speed rotation state to a high speed rotation state when the degree of the field weakening exceeds a predetermined condition in the low speed rotation state.

Motor control apparatus and motor control method

Provided is an inverter apparatusconfigured to switch a current winding to an optimal winding when a rotation speed of a rotor of an AC electric motoris within a hysteresis region defined by first and second switch timings for switching a state of an armature winding between a first winding and a second winding and when the current winding differs from the optimal winding.

Inverter apparatus, method of controlling inverter apparatus, and electric motor drive system

A wiring board includes a conductor plate including a wiring portion and an electrode portion connected to a power conversion semiconductor element, a liquid-cooling pipe mounted near the conductor plate and causing a cooling liquid to be supplied therethrough, and an insulating resin material arranged at least between the conductor plate and the liquid-cooling pipe.

Wiring board and power conversion device

A winding switching apparatus includes a winding switching device and a drive circuit. The winding switching device is configured to switch a plurality of windings of an AC motor. The drive circuit is configured to control the winding switching device. The winding switching device includes a winding switch, a diode bridge, and a capacitor. The diode bridge includes a positive-side DC output terminal, a negative-side DC output terminal, and AC input terminals. The AC input terminals corresponds to respective phases of the AC motor. The positive-side and negative-side DC output terminals are respectively connected to positive-side and negative-side DC buses provided in an inverter. The AC input terminals are respectively connected to winding-switching terminals corresponding to the respective phases of the AC motor. The AC input terminals are respectively connected to phase terminals provided in the winding switch.

Winding switching apparatus and winding switching system

A winding switching apparatus for switching windings of an AC three-phase motor is provided. In each winding switching section of the winding switching apparatus, a positive-side charging resistor, a negative-side charging resistor, and a capacitor are connected in series between a positive-side DC bus and a negative-side DC bus of an inverter; the positive side of the capacitor is connected to the cathodes of respective diodes of a diode unit; and switching between high-speed windings and low-speed windings is carried out, with a capacitor potential being the same as an inverter DC bus voltage. A state detector and a comparator are also provided for each winding switching section to detect erroneous wiring and component abnormalities.

Apparatus for switching windings of AC three-phase motor

Growing community of inventors

Kitakyushu, Japan

Koji Higashikawa