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Rotary-linear motors, able to provide both force and torque along the same axis, represent an interesting solution for managing combined linear and rotary motions along the same direction, as alternative to the usual employ of 2 separated normal motors. Anyway, rotary-linear machines are often either relatively expensive to manufacture or rather complicated to control. A novel type of brushless permanent...
This paper presents a novel dual-structure permanent magnet machine which has the distinct merits of having a compact structure with high power and torque densities. Sensorless control of this proposed machine at low speed and standstill is realized based on the indirect flux estimations by online reactance measurement (INFORM) method using transient finite element (FE) analysis. An external power...
This paper presents an approach to realize an equivalent hardware representation of PM synchronous machines through a physics-based machine model for hardware-in-the-loop simulation of PWM drives. The equivalent hardware representation of the machine is achieved using a controllable load. The load current is controlled to be the same as the currents obtained over the physics-based model of the machine...
Advanced mathematical models are essential for the simulation of the dynamic nonlinear operating behavior of a permanent magnet synchronous machine (PMSM). Usually rotor or stator oriented systems featuring constant parameters are used. Concerning sophisticated control strategies, especially for sensorless control, the dependence of the inductance on angle and load condition can no longer be neglected...
Cogging torque is a parasitic element that causes mechanical vibration, noise and undesirable starting effects in permanent magnet (PM) machines. Significant design efforts, therefore, are made to minimize cogging torque in high performance PM machines. In this paper, several cost effective displacement techniques are proposed for the design of axial-flux surface-mounted permanent-magnet (AFSMPM)...
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