CONTROL DEVICE WITHOUT A ROTATION SENSOR

摘要

One embodiment off this control device without a rotation sensor is a control device that controls an inverter (1) that drives a synchronous device (2), and is equipped with phase angle and angular velocity estimation units (5,6), which estimate the phase angle and angular velocity of a rotor using both the inductance and induced voltage of the aforementioned synchronous device, and control units (24, 26) which control the electric current output from the aforementioned inverter (1) while generating a voltage command value using a PWM that selects only a non-zero voltage vector when the aforementioned inverter (1) and electric motor (2) go from free run to startup. The aforementioned phase angle and angular velocity estimation units (5,6) utilize the aforementioned voltage command value and inverter output electric current to estimate the aforementioned rotational phase angle and angular velocity.