| 摘要 |
PURPOSE: To reduce the torque ripples of a switching reluctance motor, by suppressing the reduction of its torque when changing its field excitation phases. CONSTITUTION: In the torque control method of a switching reluctance motor 6, by a velocity-loop control (1), a torque command Tc is determined. Then, by both polarities of the torque command Tc and the electrical angle sensed through a pulse coder 7, the signals for determining the excitation phases of the motor 6 are outputted from functional signal generating circuits 8A-8C. By these signals and the torque command Tc, respective current command ir (A)-ir (C) are determined. Further, prior to a predetermined electrical angle whereat the excitation of its phase which has been excited is cut off, the electrical angle of the phase current command of this phase is made large by a correction circuit 10, according to the movement quantity of the electrical angle. Based on such phase current commands, current-loop controls (3A-3C, etc.) are performed, and the motor 6 is driven while its respective phases are excited via power amplifiers 4A-4C. Since each phase current command is made large in the latter half part of the excitation interval of each phase, the reduction of its torque is corrected in these latter half parts, and its torque ripples are suppressed. |
