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Performance Improvement of Slotless SPMSM Position Sensorless Control in Very Low-Speed Region
Iwata, Takurou,Morimoto, Shigeo,Inoue, Yukinori,Sanada, Masayuki Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
This paper proposes a method for improving the performance of a position sensorless control system for a slotless surface permanent magnet synchronous motor (SPMSM) in a very low-speed region. In position sensorless control based on a motor model, accurate motor parameters are required because parameter errors would affect position estimation accuracy. Therefore, online parameter identification is applied in the proposed system. The error between the reference voltage and the voltage applied to the motor is also affect position estimation accuracy and stability, thus it is compensated to ensure accuracy and stability of the sensorless control system. In this study, two voltage error compensation methods are used, and the effects of the compensation methods are discussed. The performance of the proposed sensorless control method is evaluated by experimental results.
Basic Study of IPMSM with High-Temperature Superconducting Wire Rod
Okada, Kazuya,Morimoto, Shigeo,Sanada, Masayuki,Inoue, Yukinori Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
It is important to improve the efficiencies of motors to overcome problems such as decreasing energy reserves and environmental pollution. Superconductors are promising for developing high-efficiency motors. However, superconducting wires must be kept in critical conditions and the AC loss needs to be minimized. In this paper, a design of a superconducting interior permanent magnet synchronous motor (IPMSM) is proposed that reduces the AC loss. The characteristics of superconducting and normal-conducting IPMSMs are compared. The proposed superconducting IPMSM has a low AC loss and a very high efficiency at low speeds.
Improvement of Demagnetization by Rotor Structure of IPMSM with Dy-free Rare-Earth Magnet
Imamura, Keigo,Sanada, Masayuki,Morimoto, Shigeo,Inoue, Yukinori Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
Permanent magnet (PM) motors that employ rare-earth magnets containing dysprosium (Dy) are used in electric and hybrid electric vehicles. However, it is desirable to reduce the amount of Dy used since it is expensive. This study investigates the rotor structure of a PM synchronous motor with a Dy-free rare-earth magnet. Flux barrier shapes and PM thicknesses that enhance the irreversible demagnetization are investigated. In addition, a rotor structure that improves the irreversible demagnetization is proposed. We demonstrate that the proposed rotor structure without Dy improves the irreversible demagnetization.