Abstract
This paper proposes a permanent magnet synchronous machine (PMSM) table-based torque control method considering a variable DC-link voltage that can be used in a low cost DSP. The current reference generation based on two-dimensional look-up table (2D-LUT) is widely used for PMSM drives used in industrial applications because of its torque control performance and operation stability. In general, a 2D-LUT is established based on the flux and torque to overcome the variation in DC-link voltage. However, this method requires a flux estimator for estimating the instantaneous flux, which is defined as a division of the operating speed used to obtain the flux data. Therefore, to obtain the operating flux, a variable division calculation or complex controller is used, which can be difficult to process through a low cost digital signal processor. In this paper, a novel look-up table-based control method that uses the newly established speed-torque 2D-LUT is proposed. This 2D-LUT inherently implements data on the d-/q-axis currents throughout the operating regions, not only the speed and torque, but also the DC-link voltage variation. The proposed method was verified through an experiment on the torque control a variation in the DC-link voltage.
Highlights
Permanent magnet synchronous machines (PMSM) have been adopted for improving efficiency of the mechanical drive in various industrial applications
The speed-torque 2D-look-up table (LUT) is created based on a DC-link voltage of 260 V, and the speed data should be modified into the speed data based on a DC-link voltage of 380 V using the method presented in Section 3, and stored into memory
The maximum power is extended in accordance with increasing DC-link voltage. These results prove that an appropriate torque control is achieved, at a DC-link voltage of 260 V and at 320 V and 380 V by means of a general feedback control using a novel speed-torque 2D-LUT
Summary
Permanent magnet synchronous machines (PMSM) have been adopted for improving efficiency of the mechanical drive in various industrial applications. In this area of applications, the PMSM drive was developed for low cost but robust control performance which is always the task to motor drive engineers. Based current control has been widely adopted to generate a current reference for precise torque generation corresponding to the torque reference This LUT is established experimentally under extreme conditions in order to consider the inductance saturation or resistance variation, and the target drive has a steady torque generation against variations in the guaranteed operation range [1]
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