Patent ID: 9425722
Filing Date: 2016-08-23
CPC Classification: H02P

Claim Text:
1. An electric motor control device comprising: a motor constant generator configured to generate a motor constant by using a temperature as a parameter; a current control unit that has an electric current generator configured to generate a current command value to an electric motor based on at least a torque command value by referring to a table prepared in advance and that is configured to execute a current control mode in which a voltage applied to the electric motor is controlled to match the current command value; a torque calculator configured to calculate a torque estimation value of the electric motor based on a torque computation formula using the motor constant; a voltage phase control unit configured to execute a voltage phase control mode in which a feedback operation is performed for a voltage phase based on a difference between the torque estimation value and the torque command value; and a control mode switching unit configured to switch to the voltage phase control mode in a high rotation area where a flux weakening control is performed, wherein the electric current generator is configured to generate the current command value under the same temperature environment as the temperature parameter of the motor constant used when the torque calculator calculates the torque estimation value.