This paper proposes a torque control method for interior permanent magnetic synchronous motors (IPMSMs). The proposed method controls the voltage amplitude and phase based on a new n-t coordinate system. The t-axis is a tangent line of a constant voltage ellipse, and the n-axis is a normal line of the ellipse. On the n-t coordinate system, the n-axis current is not affected by the voltage phase. The n-axis current is utilized to reduce the mutual coupling between the voltage amplitude controller and phase controller. The proposed method realizes a high torque response for the linear range and overmodulation range of the inverter, including six-step mode. The effectiveness of the proposed method was verified by simulation and experimental results. C⃝ 2016 Wiley Periodicals, Inc. Electr Eng Jpn, 198(3): 97-105, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com).

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This paper presents experimental drive performances evaluation of wound field flux switching motor for hybrid vehicle drive applications. A test machine with the maximum torque of 210Nm and the maximum power of 123kW expected at its design stage is built. A various experimental test result is demonstrated from viewpoints of the maximum torque and the maximum power capabilities and the motor efficiency up to its base speed of 6,000r/min. As a result, it is confirmed that the test machine promises well as a machine with very high power density more than 4.2kW/kg at the maximum power point under water jacket cooling.

As a type of non-permanent magnet motor, the Wound Field Flux Switching Motor (WFFSM) has attracted considerable research interest owing to its simple structure. Because both the field and the armature windings are placed in the stator, there is no need for bushes or a slip ring for field coil excitation. The rotor has neither a winding nor a permanent magnet, and therefore, it is suitable for high-speed and high-power-density motors used as HEV/EV drives.This paper focuses on the high-power production mechanism of WFFSM by increasing the field winding current, which allows for the extraction of higher power from a given WFFSM within given inverter voltage and current constraints. In order to achieve higher power production, one of the main factors is reducing the armature reaction in terms of higher power factor control and applied voltage suppression. In this study, we focus on magnetic saturation by increasing the field current excitation, which leads to saturation of the armature reaction. Experimental studies using a 100-kW test WFFSM confirm that the high-power production mechanism based on increasing the field winding current contributes to the extraction of higher power from the tested WFFSM.

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