INVERTER CONTROLLER FOR MOTOR DRIVE

PROBLEM TO BE SOLVED: To provide an inverter controller for motor drive which is capable of high quality drive by accurately detecting the current of each phase of a motor without incurring the increase of magnetic sound, etc. SOLUTION: This inverter controller is equipped with an inverter 2 which converts DC input into AC so as to drive a motor 3, a DC detecting circuit 11 which detects DC flowing to the above inverter 2, and a terminal voltage detector 16 which detects the terminal voltage of each phase of the above motor 3, and is provided with a phase current calculating means 7 which reproduces a current of each phase of the above motor 3, based on the DC obtained from the above DC detector 11 and the terminal voltage of each phase obtained from the above terminal voltage detector 16. It can detect the phase current of the motor 3, thus a small and low-cost inverter controller for motor drive can be materialized. COPYRIGHT: (C)2007,JPO&INPIT