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Fukuoka, Japan

The Yaskawa Electric Corporation is a Japanese manufacturer of servos, motion controllers, AC motor drives, switches and industrial robots. Their Motoman robots are heavy duty industrial robots used for example in car manufacturing.The company was founded in 1915, and its head office is located in Kitakyushu, Fukuoka Prefecture.Yaskawa applied for a trademark on the term "Mechatronics" in 1969, it was approved in 1972.The head-office, in Kitakyushu, was designed by the American architect Antonin Raymond in 1954.The company is listed on the Tokyo and Fukuoka Stock Exchange and is a constituent of the Nikkei 225 stock index. Wikipedia.

Kikuuwe R.,Kyushu University | Yasukouchi S.,Yaskawa Electric Co. | Fujimoto H.,Nagoya Institute of Technology | Yamamoto M.,Kyushu University
IEEE Transactions on Robotics | Year: 2010

High-gain proportionalintegralderivative (PID) position control involves some risk of unsafe behaviors in cases of abnormal events, such as unexpected environment contacts and temporary power failures. This paper proposes a new position-control method that is as accurate as conventional PID control during normal operation, but is capable of slow, overdamped resuming motion without overshoots from large positional errors that result in actuator-force saturation. The proposed method, which we call proxy-based sliding mode control (PSMC), is an alternative approximation of a simplest type of sliding mode control (SMC), and also is an extension of the PID control. The validity of the proposed method is demonstrated through stability analysis and experimental results. © 2010 IEEE. Source

Swamy M.M.,Yaskawa America Inc. | Kang J.-K.,Yaskawa America Inc. | Shirabe K.,Yaskawa Electric Co.
IEEE Transactions on Industry Applications | Year: 2015

SiC devices are gaining acceptance in the motor drive industry. This paper compares the power loss and efficiency between two options that can be used with SiC-based variablefrequency drives (VFDs). In the first option, the SiC VFD is equipped with an output sine-wave filter with carrier frequency at 50 kHz. A dv/dt filter is used for the second option with the carrier frequency reduced to 8 kHz. Both options are compared with a standard Si insulated-gate bipolar transistor (IGBT) VFD operating at a carrier frequency of 8 kHz with no output filter. The focus of this paper is to present different filtering options for SiC VFDs. The dv/dt filter is designed to meet the same specification as that of the standard Si IGBT VFD with no output filter, so as to present a fair comparison between a standard Si IGBT VFD and the next-generation SiC VFD. Results using a 460-V 11-kW system show that the SiC VFD with an output sine-wave filter has a lower efficiency compared with SiC VFD with a dv/dt filter. Influence of the various filtering options on leakage current in the motor drive system has also been studied, and the results are presented in this paper. © 1972-2012 IEEE. Source

Swamy M.M.,Yaskawa America Inc. | Kume T.,Yaskawa Electric Co. | Takada N.,Yaskawa Electric Co.
IEEE Transactions on Industry Applications | Year: 2012

Silicon carbide (SiC) and gallium nitride (GaN) devices have been found to withstand high voltages without showing degradation and can be switched at high frequencies, making them attractive for high-power drives. Although Sic/GaN devices can be operated at high temperature and high frequencies, it is important to develop gate-drive circuits to efficiently turn on and off these devices at high speeds. This paper proposes a resonant gate-drive circuit that aims at reducing the power loss associated with high-frequency switching of power insulated gate bipolar transistors/metal-oxide-semiconductor field-effect transistors. The main thrust of the circuit is its application to the motor-drive industry. The proposed circuit is compared with traditional gate-drive circuits from the points of view of power consumption and switching speed. Experimental results are given to illustrate the concept. Test results show that the power consumption using the proposed circuit reduces by a factor of greater than 5 compared with a traditional gate-drive circuit. © 2012 IEEE. Source

Yoon Y.-D.,Samsung | Sul S.-K.,Seoul National University | Morimoto S.,Yaskawa Electric Co. | Ide K.,Yaskawa Electric Co.
IEEE Transactions on Industry Applications | Year: 2011

This paper describes a new control algorithm which can enhance the dynamics of a sensorless control system and gives a precise sensorless control performance. Instead of the conventional sinusoidal-type voltage injection, a square-wave-type voltage injection incorporated with the associated signal processing method is proposed in this paper. As a result, the error signal can be calculated without low-pass filters and time delays, and the position estimation performance can be enhanced. Using the proposed method, the performance of the sensorless control can be enhanced; the bandwidth of the current controller was enhanced up to 250 Hz, and that of the speed controller was up to 50 Hz. © 2011 IEEE. Source

Kim S.,Seoul National University | Yoon Y.-D.,Samsung | Sul S.-K.,Seoul National University | Ide K.,Yaskawa Electric Co.
IEEE Transactions on Power Electronics | Year: 2013

The aim of this study was to develop a new method to operate an interior permanent magnet synchronous machine (IPMSM) on the maximum torque per ampere (MTPA) condition. The characteristics of the MTPA condition were analyzed and the MTPA condition was derived based on the input electric power. The proposed method injects a small current signal used for tracking the MTPA operating point along with the fundamental current for torque generation. This method does not require any machine parameters or premade lookup table. The frequency of the injected signal is several hundred hertz, and the performance of the MTPA tracking is almost free from load torque disturbance. The feasibility of the proposed method was verified under various operating conditions with computer simulation and testing with an 11 kW IPMSM drive system. © 1986-2012 IEEE. Source

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