Flux-based control approach for anisotrop PMSM for naval applications

With increasing performance of magnet material and decreasing cost permanent magnet synchronous machines (PMSM) become more and more important for practical use in naval applications. Excellent torque dynamics are important in these applications - they allow meeting additional demands due to electrical system stability. Dynamics are limited by the rating and the switching frequency of the converter. Therefore, the control has to make optimal use of these limited resources. This paper presents a stator-flux based control scheme for anisotrop PMSM which gives the maximum physically possible dynamics with regard to the limitations stated above. It bases on the indirect stator control (ISC) scheme for asynchronous machines and is similar to the virtual-grid-flux-based control of active front end converters (AFE).