access icon openaccess Field weakening control of a PM vehicle drive

This is an open access article published by the IET under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 09/10/2018, Accepted 09/10/2018, Published 22/01/2019

This paper develops a new field weakening method for an integrated permanent magnet synchronous machine vehicle drive. This method adopts both the DC-link and the rotor speed as a feedback signals to generate the demagnetising current reference. This eliminates the effect of the rotor speed on the FW controller dynamics and ensures stable operation across the whole range of speeds. Mathematical analysis of the system is used to design the controller gains to achieve the desired dynamic response. A maximum torque per ampere (MTPA) strategy is included in the control design, with a linearised function to reduce the computational demand. Experimental results show stable and satisfactory operation at different speeds and load conditions. They also illustrate smooth transition between the MTPA operation and the FW operation when the rotor speed crosses base speed.

Inspec keywords: feedback; synchronous motor drives; mathematical analysis; synchronous machines; electric current control; permanent magnet motors; synchronous motors; torque control; dynamic response; rotors; permanent magnet machines; machine control

Other keywords: controller gains; control design; MTPA operation; integrated permanent magnet synchronous machine vehicle drive; FW operation; FW controller dynamics; different speeds; demagnetising current reference; DC-link; load conditions; field weakening method; PM vehicle drive; ampere strategy; stable operation; desired dynamic response; base speed; rotor speed; feedback signals; field weakening control

Subjects: Control of electric power systems; Current control; Synchronous machines; Mechanical variables control; Drives

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