Abstract
This paper presents the cross saturation effect on a specially designed spoke type permanent magnet synchronous motor (PMSM) for the sensorless vector control. The cross saturation effect becomes very important where the sensorless control algorithm is used. Accurate flux linkage modeling is required to obtain a satisfactory position estimation and eventually minimum induced torque error. The magnetic saturation is the most impacting parameters affecting the position error. Since the Ld and Lq inductance difference is generally less than 5% in the spoke type PMSM, the accurate estimation of the cross saturation is critical for the sensorless vector control. In this paper, the designed PMSM has the Ld and Lq difference in 15% level even for the overload capacity. So it is even possible to operate the motor in the transient modes with the overload capacity by estimating right cross saturation effect with certain time limits. The mapping of the inductances and efficiency are obtained by using Finite element method and presented in the paper. Some experimental results are also given such as efficiency and power-speed variation at the constant torque.
Highlights
THE rapid developments in magnetic materials used in the production of electric motors has led to the development of special electric motors such as brushless DC, permanent magnet synchronous motors with the electronic commutation
Reaching high speeds in the electronic components used in motor drive systems and the cost reduction in the manufacturing are supporting this development
Permanent magnet synchronous motors (PMSM) with sensorless control requires to take into account the cross saturation carefully
Summary
THE rapid developments in magnetic materials used in the production of electric motors has led to the development of special electric motors such as brushless DC, permanent magnet synchronous motors with the electronic commutation. It is very critical to find the most suitable motor and drive system in terms of the design and control algorithm for the application. Permanent magnet synchronous motors (PMSM) can be used widely in the systems from low to medium power because of their high efficiency, high torque/inertia ratio, high reliability and high dynamic performance features. Ac variable-speed drive of a permanent magnet synchronous motor needs a position sensor for the commutation and current control. Interior PM synchronous motors are naturally suitable for the sensorless control because of their saliency. PMSM with sensorless control requires to take into account the cross saturation carefully. The similar study was performed on the salient pole synchronous motor and the limitation of classical linear uncoupled model compared to experimental results was shown [10]. It is shown that the motor can be operated with the accurate positioning at under and overload conditions by using the sensorless control without any problem
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