Abstract
The research of innovative solutions to improve the efficiency of electric drives is of considerable interest to challenges related to energy savings and sustainable development. In order to successfully validate the adoption of new and innovative software or hardware solutions in the field of electric drives, accurate measurement procedures for either efficiency or power losses are needed. Moreover, high accuracy and expensive measurement equipment are required to satisfy international standard prescriptions. In this scenario, this paper describes an accurate measurement procedure, which is independent of the accuracy of the adopted instrumentation, for the power losses variations involved in electrical drives, namely ΔΔP, useful to detect the efficiency enhancement (or power losses reduction) due to the real-time modification of the related control algorithm. The goal is to define a valuable measurement procedure capable of comparing the impact of different control algorithms on electric drive performance. This procedure is carried out by experimentally verifying the action of different control algorithms by the use of a Field Oriented Control (FOC) with different values of the direct-axis current component (i.e., Id = 0 A and Id = −1 A) applied for fixed working conditions in terms of speed and load torque. Two different measurement systems of power losses, each one characterized by different accuracy and cost, are taken into account for the validation of the proposed method. An investigation is, then, carried out, based on the comparison between the measurements acquired by both instrumentations, for different working conditions in terms of load and speed, highlighting that the uncertainty generated by systematic errors does not affect the ΔΔP measurements. The results reported in this work demonstrate how the ΔΔP parameter can be used as a valuable index for the characterization of the power drive system, which can also be evaluated even with low-accuracy instrumentation.
Highlights
In recent years, the challenges related to the reduction of environmental pollution, energy savings and sustainable development have aroused the interest of the scientific and industrial communities and of society and policies of the countries
The topic of the design and development of maximum torque per ampere control algorithms for Permanent Magnet Synchronous Motors (PMSMs) is continuously discussed [9,10,11] in the recent literature, as well as for the so-called loss model algorithms (LMAs), which involve the real-time determination of the optimal value of the magnetization level for the power losses minimization of the motor [12,13,14] in any working operation in terms of speed and applied load
By defining Tn and ωn as the rated Interior Permanent Magnet Synchronous Motor (IPMSM) torque and speed values and according to Table 8, an additional point, which is not suggested by the standard, is included within the sets of measurement
Summary
The challenges related to the reduction of environmental pollution, energy savings and sustainable development have aroused the interest of the scientific and industrial communities and of society and policies of the countries. In this scenario, the field of electrical drives plays a fundamental role, since it represents the biggest consumer related to global energy. A possible solution for the energy savings purpose is the design and development of control algorithms for PMSM electric drives, with the aim of minimizing the power losses, maximizing, the related overall efficiency. The topic of the design and development of maximum torque per ampere control algorithms for PMSM is continuously discussed [9,10,11] in the recent literature, as well as for the so-called loss model algorithms (LMAs), which involve the real-time determination of the optimal value of the magnetization level (or any other loss variable) for the power losses minimization of the motor [12,13,14] in any working operation in terms of speed and applied load
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