Patent ID: 9748883
Date: 2017-08-29
CPC Classifications: H02P

Claim:
1. A control device for a rotating electrical machine, the rotating electrical machine comprising a rotor and a stator, the rotor comprising a field winding and the stator comprising an armature winding, the control device capable of adjusting a field current flowing in the field winding and an armature current flowing in the armature winding, wherein when the armature current flowing in the armature winding is expressed by using a current vector comprised of a d-axis current and a q-axis current in a d-q coordinate system, in a case in which the field current starts to increase due to increasing of the torque instruction value to be supplied to the rotating electrical machine, the control device gradually reduces the d-axis current during a predetermined period of time after increasing the d-axis current in the direction to generate the field current, which is opposite from a direction to generate a magnetic flux by the field current, the control device executes an exponential attenuation of the d-axis current during the predetermined period of time in order to gradually reduce the d-axis current.