초록 ▼

A motor control apparatus and method is disclosed for controlling a multiphase AC motor by controlling electrical quantities such as voltage or current applied to the stator of the motor. The apparatus includes a motor command unit for defining a reference signal indicative of a desired motor parame

A motor control apparatus and method is disclosed for controlling a multiphase AC motor by controlling electrical quantities such as voltage or current applied to the stator of the motor. The apparatus includes a motor command unit for defining a reference signal indicative of a desired motor parameter such as torque, speed, or position, a DC voltage link, a controller, a line-side converter including active switches in a bridge configuration for controlling the bidirectional flow of electrical power between the DC voltage link and a source of AC power, and a motor-side converter including active switches in a bridge configuration for controlling stator electrical quantities by controlling the bidirectional flow of electrical power between the DC voltage link and the motor, where the motor-side converter includes control means responsive to the reference signal for controlling the active switches to produce stator electrical quantities that correspond to the reference signal.

대표청구항 ▼

A method for controlling stator currents in a multiphase AC motor rotating at variable speeds to obtain torque, speed, or position control of the motor, wherein the stator currents are switched by an self-commutated active rectifier that establishes a rotating flux field in the rotor of the motor, t

A method for controlling stator currents in a multiphase AC motor rotating at variable speeds to obtain torque, speed, or position control of the motor, wherein the stator currents are switched by an self-commutated active rectifier that establishes a rotating flux field in the rotor of the motor, the method comprising the steps of: defining a reference signal indicative of a desired motor torque, speed, or position; determining a desired direct axis current representing rotor flux in a direction aligned with the rotor flux field in a rotating field coordinate system; converting the reference signal into a desired quadrature axis current representing rotor torque, wherein the quadrature axis current is normal to the rotor flux field in the field coordinate system; sensing the rotational speed of the rotor; sensing the actual stator currents; determining a rotor flux angle indicative of the instantaneous position of the rotor flux field; converting the desired quadrature and direct axis currents into desired stator currents in a stationary stator coordinate system using the rotor flux angle; determining a distortion index indicative of the magnitude of current errors between the actual and desired stator currents; and supplying pulse width modulation signals to the switches of the active rectifier to produce stator currents that minimize the distortion index, wherein the step of supplying pulse width modulation signals comprises the steps of generating signals that are complimentary for each pair of active switches, and causing one active switch of each pair to switch on and the other active switch of the pair to switch off as appropriate to minimize the distortion index.