Abstract
This paper presents a novel, high performance maximum torque per ampere control (MTPAC) of an interior permanent magnet synchronous motor (IPMSM) that is chosen for a vehicular application. In vehicular applications IPMSMs are usually controlled with MTPAC method due to fully utilization of reluctance torque, usually with this method maximum torque per ampere trajectories are obtained by look up tables because of nonlinear relation between torque and current; however, utilization of look up tables decreases the real time performance and reliability of the system. Some studies have been used MTPAC with nonlinear equations between d-q axes currents and torque; however, controller calculation burden can be reduced with proposed method. In this study relationship between torque and stator current magnitude is obtained as a first order linear equation with curve fitting. Thereby it has been possible to work with only one linear torque equation instead of nonlinear equations, therefore controller performance and reliability is increased. Control of the motor is simulated under different load conditions, and results are given and analysed.DOI: http://dx.doi.org/10.5755/j01.eee.19.7.2159
Highlights
Interior permanent magnet synchronous motors (IPMSM) are widely used in modern drive applications
In this study an electric vehicle that uses IPMSM as a traction motor simulated with proposed maximum torque per ampere control (MTPAC) method
Motor is produced a torque for only overcoming the friction under no load, and both d and q axes currents are used for overcoming the inertia; on the other hand, in full load operation d and q axes currents are used both in transient operation and steady state operation for optimum current usage that aimed in MTPAC
Summary
Interior permanent magnet synchronous motors (IPMSM) are widely used in modern drive applications. Achieving maximum torque/ampere ratio is a critical issue especially in constant torque region. There are several approaches to make use of reluctance torque like unity power factor control [4], maximum efficiency control [5] and maximum torque per ampere control [6]–[11]. None of these works dealt with calculation complexity of the controller, only in [6] a curve fitting method proposed, it is possible to obtain a simpler and accurate current-torque relation.
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