Topology optimization (TO) has been extensively studied in the past decades especially mechanical engineering. Among different techniques, density-based methods have become very popular. In electrical engineering, TO applied essentially to linear actuators [1] or machines rotors [2] [3], but few works such as [4] deal with coil repartition within stator of rotating machines. this study, we inve...

It is predicted that the maximum speed of EV traction motors will increase in future due to reductions size and weight. The high-speed are required have high mechanical strength rotor for rotation, addition satisfying output efficiency wide operation area. Therefore, it necessary evaluate advantages disadvantages terms both electrical points view. In this research, three motor types, PMSM, SRM,...

Based on the general nonlinear magnetizing model (GNMM) from our previous research work, an improved method of detecting rotor position for sensorless control of SRMs in super-high speed operation has been developed. With minimum input data, the approximated GNMM is obtained and the rotor speed estimated. Then the rotor position is detected by the motion equation. To remove rotor position error...

The electromagnetic torque and speed in Switched Reluctance Motor (SRM) greatly depend on the excitation parameters i.e. turn-on angle, turn-off angle, dwell angle and magnitude of the phase currents of its phases. At lower speeds, a change in the current contributes the torque requirement which can be achieved either by voltage control (pulse width modulation) or instantaneous current control ...

Position sensorless control has been widely studied for electrical rotor position estimation. However, because of the magnetic periodicity, mechanical multipole electric machine was hardly reported. By increasing dimensions, this article proposes novel topologies named as dual-gap dual-pole composite machines, where can be demodulated from positions two air gaps. The and corresponding theory ar...

The majority of research into full-sized helicopter overlapping propulsion systems involves co-axial setups (fully overlapped). Partially overlapping rotor setups (tandem, multirotor) have received less attention, and empirical data produced over the years is limited. The increase in demand for compact small unmanned aircraft has exposed the need for empirical investigations of overlapping prop...

A novel machine family – dual-rotor, Radial-Flux, Permanent-Magnet (RFPM) machines -has demonstrated that it can substantially improve machine torque density and efficiency. The objective of this paper is to provide a performance comparison between two major alternatives of this technology: Surface-mounted dual-rotor RFPM machines and Axial-Flux Permanent-Magnet (AFPM) machines. The comparison ...

Abstract— The Switched Reluctance Motor (SRM) drive has evolved as an alternative to conventional motors in variable speed drives because of advantages like simple and rugged structure, absence of rotor winding, adaptability to harsh environments and high speed operation. This paper presents the speed control of Asymmetrical converter fed 4 phase 8/6 Switched Reluctance Motor drive using PWM co...

We present a solution to torque ripple minimization in switched reluctance motors (SRM) based on set invariance theory. We start from a piecewise affine approximation (PWA) of the overall torque characteristics over rotor angle – phase currents space and derive a PWA motor model. Within it we also take into account finite bandwidth of the phase current control loops. Using the PWA model and inv...