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This paper presents a moving-magnet type linear actuator designed by using flux concentration type permanent magnet arrangement, which can generate higher magnetic flux density in air-gap. In this construction, detent force which is induced by both slot-effect and end-effect becomes larger due to strong attractive forces. To reduce cogging force we have employed a modular mover structure of two magnetic...
Fractional calculus is a generalization of the integration and differentiation to the fractional (non-integer) order. In this paper, we devised a fractional-order periodic adaptive learning compensation (FO-PALC) method for cogging effect minimization for permanent magnetic synchronous motors (PMSM) position and velocity servo system. Cogging effect is a major disadvantage of PMSM. In fact, the cogging...
In this paper, we focus on the analytical calculation of the tangential forces that generate the armature and the cogging torque in brushless DC machines. We extend previously presented methods using conformal mapping to (i) avoid the singularity of the magnetic flux density at the tooth tip during the transformation and thereby overcome the limitations of this approach with respect to the calculation...
Expanding Part I of our contribution, this paper deals with the analytical calculation of the tangential forces in brushless dc machines, where we extend previously developed methods using conformal mapping and the Maxwell stress theory to enable a greater applicability of such methods. While Part I focuses on the explanation of the methodology itself, aiming to convey the overall picture and not...
Cogging effect is a serious disadvantage of the permanent magnetic synchronous motor (PMSM), and cogging force is a position-dependent periodic disturbance. In our previous work [1], a dual high-order periodic adaptive learning compensation (DHO-PALC) method for state-dependent periodic disturbance was presented, where the long term stability issue was not addressed. Due to the impact of the high...
Torque pulsation reduction of permanent magnet synchronous motor (PMSM) is an important design issue. One component of this pulsation is cogging torque, which depends on magnetic configuration of stator and rotor (e.g., magnets and slots shape and dimensions). This paper presents a new physical and mathematical analysis of cogging torque for surface mount PM (SFPM) motor. Based on the analysis, a...
In this paper, a simulation model of PMSM position servo system is presented briefly first, we then propose a high order periodic adaptive learning compensation (HO-PALC) method for cogging effect on PMSM position and velocity servo tasks. The cogging force is considered as a position-dependent disturbance that is periodic. The key idea of the implemented cogging disturbance compensation method is...
A fundamental disadvantage of 3-dimensional finite-element simulations is high computational cost when compared to 2-dimensional models. However, for 3-dimensional specific features full models are essential, in principle. An approach to avoid this necessity is the multi-slice method. It is a well known procedure to determine the torque of electrical machines with a skewed rotor only deploying slices...
An error estimation technique based on the L2 error norm is implemented in this paper for magnetostatic finite-element analysis. Convergence of both the global and local errors are used as indicators. The air gap is refined based on the rate of change in the calculated force and consists of layers. Results that highlight the accuracy of the combined methods for cogging torque calculations are displayed...
Based on the characteristics of transverse flux permanent magnet machine (TFPM), a novel multi-pole and multi-phase TFPM topology with assembled stator and concentrated flux rotor is presented in this paper. The associated electromagnetic fields of the prototype are investigated by means of three dimension equivalent magnetic network method (3DEMNM). It is shown the unique multi-phase structure of...
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