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Encoderless Servo Drive with Adequately Designed IPMSM for Saliency-based Position Detection
K. Ide,M. Hisatsune,T. Shiota,S. Murakami,M. Ohto 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents a newly developed encoderless servo drive with an adequately designed interior permanent magnet synchronous motor (IPMSM). The motor for encoderless servo drive is designed to act like resolver incorporated with saliency-based position detection technique. The resolution of the position detection and sustainability against load are considered in the design. As the position detection a pulse voltage injection technique is employed to realize higher dynamics in the control performance than conventional technique. This paper mainly focuses on the technology fusion in between motor design and control design. Finally, the fast initial pole positioning, the high-dynamics performance in position and speed control, which are sufficient for servo drive applications, are shown in this paper. The net-resolution of the position detection is about 10 bits, and the accuracy of positioning is less than 1 mechanical degree in position control at steady state.
Encoderless Motor Design for Servo Drive Applications
S. Murakami,M. Ohto,M. Hisatsune,T. Shiota,K. Ide 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Improvement of output power of encoderless motor is desired in servo drive applications. However, as load on the encoderless motor increases, high frequency inductance distribution distorts so heavily that rotor position estimation becomes very difficult, which is a major technical problem hindering the improvement. This paper deals with a motor design aiming for high output power encoderless motor with concentrated winding and IPM configuration. First, reduction of armature reaction is referred to as the fundamental design concept. Next, a motor configuration realizing the concept is proposed. Then, motor design is conducted, and characteristics of a prototype motor is measured and evaluated. As a result, the prototype motor is verified to achieve basic servo motor performances and to have an almost sinusoidal high frequency inductance distribution feature without crucial distortion even when load increases. Output power of encoderless motor is enhanced by the design method presented in this paper.