| 摘要 |
<p>A PWM modulation unit (7) modulates an inputted 3-phase voltage instruction according to the PWM method and outputs a gate signal to each phase switching element of an inverter (4). A high-frequency component calculation unit (8) calculates a high-frequency component of a current generated by a voltage decided by the PWM modulation unit (7) and outputted from the inverter (4), for each switching of the inverter (4). An index calculation unit (9) calculates a value proportional to a rotation phase angle estimation error as an index R according to a high-frequency component of a current in a ?-d coordinate system which rotates in synchronization with rotation of a synchronous motor (6). The rotation phase angle estimation unit (10) executes a rotation phase angle estimation calculation by using the index R. Thus, it is possible to provide a synchronous motor sensorless control device which can perform stable operation by a simple adjustment without significantly increasing the calculation amount.</p> |
