A New Current Vector Control Method of IPMSM in Flux Weakening Region to Prevent Inverter Voltage Saturation

Abstract

This paper proposes a new current vector control method that prevents voltage saturation by regulating the rate of pulse width modulation (PWM) in a flux weakening region according to a reference. While conventional methods use current limiting on both axes (d-axis and q-axis), our method stabilizes the current vector at onset to and within the flux weakening region using only q-axis current signal control. By eliminating the control of the d-axis current, the circuitry of the field programmable gate array (FPGA) is simplified. The effectiveness of the proposed method is verified through experiments of load fluctuations and supply voltage variations.

Mtpa and Flux Weakening Control of Permanent Magnet Synchronous Motor for Electric Vehicle

“…Any voltage vector, in a certain area at certain moment, can be obtained by two adjacent non-zero voltage vectors and zero voltage vectors in different combinations of time. In a sampling period, the action time of each voltage vector can be controlled by applying the action time of the two voltage vectors for several times [11]. As a result, the trajectory is close to circular rotation, and the switching state of the inverter is determined by the comparison between the actual flux circle and the ideal flux circle, thus forming PWM waves.…”

Winding Design and Lead-angle Control for the Maximum Speed of an Interior Permanent-Magnet Brushless DC Motor

“…In this case, the torque is constant and output power is increased with speed. In [10][11][12][13][14][15][16][17][18][19][20], maximum speed of PMBLDCM is regulated by flux-weakening. If PMSM is operated to PMBLDCM, it can be operated at high efficiency [21][22][23].…”