Patent ID: 6958586
Filing Date: 2005-10-25
Classification: H02P

Abstract:
1. A vector control inverter comprising: a speed detecting unit that detects a rotation speed of a motor; a current detecting unit that detects a primary current applied to the motor from an inverter circuit; a current converting unit that splits the primary current into an excitation current and a torque current; a calculating unit that calculates an excitation voltage and a torque voltage based on the rotation speed; a voltage converting unit that outputs a three-phase output voltage from the excitation voltage and the torque voltage; a modulating unit that outputs, based on the three-phase output voltage, a signal to control switching devices of the inverter circuit; an estimating unit that estimates an output torque of the motor from the excitation current and the torque current; and a pulse transmitting unit that outputs the output torque as a positive-negative identifiable pulse stream signal.