過渡応答特性を考慮したブラシレスDCモータの広範囲速度制御システム

抄録

Recently, a Brushless DC Motor (BLM) system, which has excellent characteristics, is realized by development of a permanent magnet with large residual magnetic flux density and coercive force, and advancement of power electronics technique. And it has be applied to various industrial fields, For a small size and hand-held type of BLM with low moment of inertia and high generating torque, the purpose of this study is to realize the system with the characteristics of smooth revolution and excellent transient response in a wide operating region. The BLM system applying optimal feedback control is constructed to accomplish high speed transient response and robustness against a disturbance and variation of parameters. To use in a wide operating region for the BLM, it is needed to compensate the nonlinearity by change of motor constants and large variation of a feedback signal. So, it is shown that variable gain control method varying the compensating element is useful. The relation between the weight of quadratics performance index and the characteristics of transient response is shown, then the optimal feedback gain accomplished the good transient response is clarified. It is cleared that the analytical and simulative results of the BLM system applying optimal feedback control with variable gain show the characteristics of excellent response over a wide operating range. The BLM system used DSP in the control circuit is constructed, and the excellent transient characteristics of the system is confined by experiments. Consequently, it is clarified that the variable gain control method is useful for the BLM system with a wide operating region.