Stator Flux Oriented Induction Motor Drive with Rotor Time- Constant Adaption Using Energy Function.

• Main Authors: Liu ,Gee-Shen, 劉繼賢
• Other Authors: Lin, Faa-Jeng
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/94105955309161219770

碩士 === 中原大學 === 電機工程研究所 === 84 === A robust direct stator-flux-oriented induction motor drive with on-line rotor time-constant adaptation is introduced in this thesis. The stator flux observer which is derived from the voltage equations of the dynamics model of induction motor is used to achieve the direct stator flux orientation. However, the effectiveness of the decoupled controller in the mechanism of the stator flux orientation is dependent on the accuracy of motor parameters, especially the rotor time-constant, A model reference adaptive control approach using energy function is proposed to adapt the rotor time-constant on-line in this thesis. To increase the accuracy and computation rate of the estimation algorithm, a TMS320C31 digital signal processor, install in a PC-486, is used to implement the algoithm. An AD/ DA servo control card is used as the I/O interface between the computer system and the drive circuit, and a current controlled pulse width modulation voltage source inverter is used to drive the induction motor. To reduce the calculation burden of the CPU and to increase the accuracy of the three-phase command current, the coordinate transformation in the field oriented mechanism is implemented by an AD2S100 AC vector processor. Moreover, an integral proportional speed controller is used to test the proposed robust direct stator flux oriented induction motor drive. Furthermore, to preserve the robust control performance under parameter variations and external load- disturbance, a hybrid speed controller based on variable structure control is proposed in this thesis to deal with the uncertainties of the motor drive. Using the above control structure, the decoupled control of torque and flux in the stator-flux-oriented mechanism is guaranteed by the on- line estimated rotor time-constant; and the robust control performance is obtained by the VSC-based speed controller.