ELECTRIC MOTOR CONTROL DEVICE AND ELECTRIC MOTOR CONTROL METHOD

To provide an electric motor control device and an electric motor control method for enabling stable control of torque and a rotation speed with a simple configuration.SOLUTION: The electric motor control device for controlling an electric motor such that a driving current for the electric motor follows a current command value, includes a sensor magnet that forms a first magnetic field by rotating in association with a rotor of the electric motor, a magnetic sensor that measures a synthetic magnetic field including the first magnetic field and a second magnetic field formed by the driving current, a rotation angle calculation unit that separates the first magnetic field from a measurement value of the synthetic magnetic field, and calculates the rotation angle of the rotor from the separated first magnetic field, a current calculation unit that separates the second magnetic field from the measurement value of the synthetic magnetic field, and calculates a driving current from the second magnetic field, and a current control unit that controls the electric motor on the basis of the rotation angle calculated by the rotation angle calculation unit, the driving current calculated by the current calculation unit, and the current command value.SELECTED DRAWING: Figure 3 【課題】簡素な構成でトルク及び回転速度を安定して制御することが可能な電動機の制御装置及び電動機の制御方法を提供する。【解決手段】電動機の駆動電流が電流指令値に追従するように電動機を制御する電動機の制御装置であって、電動機の回転子と共に回転し、第１の磁界を形成するセンサマグネットと、第１の磁界及び駆動電流が形成する第２の磁界を含む合成磁界を測定する磁気センサと、合成磁界の測定値から第１の磁界を分離し、分離された第１の磁界から回転子の回転角を算出する回転角算出部と、合成磁界の測定値から第２の磁界を分離し、分離された第２の磁界から駆動電流を算出する電流算出部と、回転角算出部によって算出された回転角、電流算出部によって算出された駆動電流、及び電流指令値に基づいて、電動機を制御する電流制御部と、を備える。【選択図】図３