Stator flux magnitude and direction control strategies for permanent magnet synchronous motors

摘要

The present disclosure relates to a motor control circuit and related method that includes a transform component configured to receive current values associated with a motor being driven by the motor control circuit, and output polar coordinate values representing a magnitude component and a direction component of a current space vector. The motor control circuit further includes a control component configured to receive the magnitude component and the direction component of the current space vector, and generate motor control signals for driving the motor.

主权项

1. A motor control system, comprising:
a transform component configured to receive current values associated with a motor being driven by the motor control circuit, and output polar coordinate values representing a magnitude component and a direction component of a current space vector, wherein the transform component comprises:
a Clarke transform component configured to receive the current values associated with respective phases of the motor being drive, and convert the current values into a Cartesian space to obtain Cartesian current values of the current space vector;a Cartesian to polar transform component configured to receive the Cartesian current values and convert such into the magnitude component and the direction component of the current space vector; anda subtraction circuit configured to subtract a position angle from the direction component to transform the direction component from a stationary coordinate system to a rotating coordinate system; and a control component configured to receive the magnitude component and the direction component of the current space vector, and generate motor control signals for driving the motor, wherein the control component further comprises:
a magnitude controller configured to receive the magnitude component of the current space vector and a feedback control value associated with a speed value and a reference value, and generate a magnitude of a voltage space vector based thereon, wherein the speed value is calculated from the position angle;a direction controller configured to control a direction of the voltage space vector to make a stator flux space vector perpendicular to a rotor magnetic field of the motor being driven; andan addition circuit to add the position angle to the voltage space vector to transform the voltage space vector from a rotating coordinate system to a stationary coordinate system; a polar to Cartesian transform component configured to receive the voltage space vector in the stationary coordinate system and generate the voltage space vector in Cartesian coordinates in the stationary coordinate system; and position estimator circuit configured to receive the voltage space vector from the polar to Cartesian transform component and the current space vector from the Clark transform component, and generate the position angle as an estimate based on the Cartesian coordinates of the voltage space vector and the Cartesian components of the current space vector.