Title :
Microprocessor based feedback control using reactive power measurement for squirrel cage induction motor drives
Author :
Rao, U. Madhava ; Varma, Rahul ; Perlekar, S.D. ; Acharya, G.N.
Author_Institution :
Central Electron. Eng. Res. Inst., Pilani, India
Abstract :
A scheme to control the air gap flux of a three-phase squirrel-cage induction motor operating with a PWM inverter for variable-speed operation is presented. The scheme is based on the measurement of the fundamental component of motor terminal voltage, current, and the phase angle between them, and calculation of the motor reactive power using a microprocessor. The measured total reactive power fed to the induction motor, the motor leakage, and magnetizing inductances are used to calculate the motor magnetizing current by the processor. The calculated magnetizing current is used to regulate the air gap flux at the desired level in a variable-frequency induction motor drive.<>
Keywords :
feedback; machine control; magnetic variables control; microcomputer applications; power engineering computing; power measurement; reactive power; squirrel cage motors; variable speed drives; PWM inverter; air gap flux; feedback control; magnetizing current; microprocessor; reactive power measurement; squirrel cage induction motor drives; three-phase; variable-frequency; variable-speed operation; Current measurement; Feedback control; Induction motors; Magnetic flux; Micromotors; Microprocessors; Power measurement; Pulse width modulation inverters; Reactive power; Reactive power control;
Conference_Titel :
Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/IAS.1989.96720
