Method for controlling starting voltage/starting time of induction motor drive

摘要

PURPOSE: A method for controlling a driving voltage/driving time of an inductive motor is provided to control reliably magnetic flux of the inductive motor by surmounting a driving torque of the inductive motor using a foil bearing with a large quantity of frictional torque in a driving process. CONSTITUTION: An initial driving voltage and an initial driving time are set up(S10). A driving test is performed(S20). A driving state of an inductive motor is checked according to the initial driving voltage(S20-S30). A new initial driving voltage is calculated by a predetermined mathematical expression if the inductive motor is not driven(S40). The initial driving voltage is determined as a driving voltage if the inductive motor is driven(S50). The driving state of the inductive motor is checked according to the initial driving time by performing the driving test once more(S60-S70). A new driving time is calculated by the predetermined mathematical expression if the inductive motor is driven(S80). The previous driving time is determined as the driving time if the inductive motor is not driven by the new driving time(S90).