| 摘要 |
PROBLEM TO BE SOLVED: To restrain transient vibration by pecisely controlling output torque in speed change. SOLUTION: An integrator 115 integrates a slip angular velocity command value ωse * which a vector control command value operator 101 outputs according to a torque command value T*, and outputs a slip angle phase θse . A rotation position detector 113 outputs rotation angle position θre by a signal from an encoder 103. A power supply angle phase operator 114 adds the slip angle phase θse to the rotation angle position θre , and calculates a power supply angle phase θ. A PWM generator 110 uses the power supply angle phase θ, and outputs a three-phase PWM signal, on the basis of an exciting component voltage command value vγs* and a torque component voltage command value vδs*. An inverter 111 outputs three-phase AC and controls the output torque of an induction motor 100 to be the torque command value T*. Since the rotation angle position which can obtain the newest value by the encode is used for the power supply angle phase calculation, measurement error in speed change is small, and precise control to a command value is enabled. |
