Variable Incremental Controller of Permanent-Magnet Synchronous Motor for Voltage-Based Flux-Weakening Control

Abstract

This study presents a variable incremental controller for flux-weakening control in the high-speed operation area of a permanent-magnetic synchronous motor (PMSM). In general, voltage-based flux-weakening control utilizes a reference voltage and a PI controller to generate a flux component current. In this paper, the voltage-based flux-weakening control is performed using the variable incremental controller instead of the PI controller. The variable incremental controller can control the flux component current using only the maximum speed and maximum current of the motor. A method for properly setting an appropriate variable incremental controller using acceleration is additionally presented. A variable incremental controller is applied and, accordingly, the overshoot of the motor speed can be reduced and the speed error of the motor can be minimized by reducing the difference between the actual motor and targeted accelerations. This method can simplify the design of a controller that utilizes flux-weakening control and can be applied to railroad cars whose acceleration does not alter frequently to increase the effect of motor control.

Deep Flux Weakening Control of IPMSM Based on D-axis Current Error Integral Regulator

“…After more than two decades of development, the control method of flux weakening (FW) control has gradually matured. The prevailing FW control methods are the formula method [1], table look-up method [2,3], gradient descent method [4], leading angle FW control method [5,6], and negative d-axis current compensation method (NDCCM) [7][8][9][10][11][12]. NDCCM is the most widely used FW control method, because it has a simple control method and high adaptability between different motors.…”