ELECTRIC MOTOR CONTROLLER

摘要

PURPOSE: An electric motor controller is provided to be capable of driving a synchronous motor having no position sensor stably at high efficiency by carrying out simple control. CONSTITUTION: A direct current of a DC power source(1) is applied to an inverter circuit(2) and converted into an alternating current. The alternating current is supplied to a motor(3) via a motor current detection section(4). The motor(3) is a synchronous brushless motor and not provided with position sensors for detecting the position of its rotor. The output of the motor current detection section(4) is input to a detection section(57) having a reactive current computing section(54). The detection section(57) is included in an inverter control section(55). The detection section(57) computes a reactive current and outputs a detected value on the basis of the value of the reactive current to a computing section(58). Various set values to control the inverter circuit(2) are set in a setting section(56). The set value is a target value of the detected value output from the detection section(57).