A Comprehensive Optimization Control Method for Hybrid Excitation Synchronous Motor

Abstract

<jats:p>Hybrid excitation synchronous motor (HESM) offers the advantages of a convenient flux regulation and a wide range of available speeds. As such, it may be conveniently employed in the fields of electric vehicle and aerospace. In this paper, based on a suitable control strategy for vector and speed partition, we put forward a speed control method for HESM which shows optimal efficiency. On the one hand, our method aims at minimizing the copper loss by an optimal configuration of the <jats:italic>q</jats:italic>-axis current, the <jats:italic>d</jats:italic>-axis current, and the excitation current under the constraint voltage at the armature end. On the other hand, we conduct a comprehensive analysis of the effects of the flux-weakening speed coefficient on the operating performance of the motors and suggest a self-adaptive control method to regulate that coefficient and further improve the overall performance of the motors, including their speed-range regulation, their efficiency, and their dynamical properties. The proposed flux-weakening control method has been assessed by simulations and HESM-driven experiments. Results have confirmed the feasibility and optimality of our method.</jats:p>

On-line loss and global efficiency simulation tool for electric vehicles applications

“…6, where each section losses are marked in red, control blocks in blue, and the converters with their respective voltages modification in orange. The current references were calculated using the minimum current per torque (minCPT) strategy [11]. The latter takes a torque reference as input and calculates the corresponding current references ( * , * , * ) using the Lagrangian multiplier method, which has an objective of determining the minimum of the trio currents that satisfies (7) for a certain torque reference.…”

Modern Hybrid Excited Electric Machines

“…For all machines with hybrid excitation the general mathematical model is described by Equations ( 1) and (2). They show that the induced voltage and magnetic flux related to the machine axes d and q -and, consequently, to the electromagnetic torque depend on the flux from permanent magnets and the current in the excitation coil [18,19]. Information about transformation from threephase (L1 -L2 -L3) system to two phase (α-β) system, and then to d-q axis, are described in details e.g., in [20], The mathematical description (voltage equations) of magnetic bearings is very similar to the description of hybrid-excited electric machines due to the appropriate selection of the coordinate system (rotating with the rotor).…”