Synchronous machine drive control device, and vehicle equipped with synchronous machine subjected to drive control by said synchronous machine drive control device

A synchronous machine drive control device that carries out a drive control of a synchronous machine, the synchronous machine drive control device comprising:

• a current detection device that detects a three-phase current;
• a power converter;
• and
• a control device having a rotation angle correction amount calculator that calculates a correction amount of a rotation angle of the synchronous machine and controlling the power converter, wherein
• the rotation angle correction amount calculator determines whether a rotation speed of the synchronous machine is equal to or greater than a predetermined value and outputs a three-phase short circuit command based on the rotation speed being equal to or greater than the predetermined value,
• the correction amount of the rotation angle is calculated based on a current detected by the current detection device by a three-phase short circuit being implemented in a state wherein the synchronous machine is rotating, and
• the three-phase short circuit is implemented based on the three-phase short circuit command being output by the rotation angle correction amount calculator and all of upper arm switching elements being turned off and all of lower arm switching elements being turned on in the power converter such that a q-axis current becomes practically zero and a negative d-axis current flows.