Recently, many optimal designs for axial flux permanent magnet (AFPM) motors were performed based on finiteelement (FE) analysis. Most of the models are based on reduction of 3D problem to 2D problem which is not accurate for design aspects. This paper describes an accurate electromagnetic analysis of a surface mounted, 28 pole AFPM with concentrated stator winding. The AFPM is modeled with thr...

The accurate information of the initial rotor position is very critical for successful starting of the Surface-mounted Permanent Magnet Synchronous Motor (SPMSM). In order to solve the problems of low accuracy and unreliability in the conventional estimation strategy, in this paper, an improved initial rotor position estimation strategy without any position sensor for SPMSM at standstill is pro...

This paper investigates a drive system with energy recovery which uses 3-phase 1-kW 36-slot 12-pole distributed winding outer-rotor surface-mounted permanent-magnet synchronous motor (SPMSM) and generator (SPMSG), can be used in indoor exercise bicycles. In order to extend operating speed range, the constant torque control, flux-weakening maximum torque/voltage control are its operation up 1.75...

Nowadays, Permanent Magnet Synchronous Motors have been considered as one of the best ones used in industry due to their high efficiency, low torque ripples and well known dynamical operation. Indeed, it is expected that this type of motors can be used more frequently. In this paper, a special type of these motors, the surface mounted PM motor, is considered. After introducing the mathematical ...

The purpose of this paper is to describe a model predictive direct torque control (MPDTC) with load angle limitation for surface-mounted permanent magnet synchronous motor (SPMSM) drive system. In this paper, an exact discrete-time state-space model of SPMSM is presented, which improves the state prediction accuracy comparing to simple Euler approximation. A finite control set type MPDTC is use...

In this study, automatic detection of stator winding inter-turn short circuit fault (SWISCFs) in surface-mounted permanent magnet synchronous motors (SPMSMs) and automatic classification of fault severity via a pattern recognition system (PRS) are presented. In the case of a stator short circuit fault, performance losses become an important issue for SPMSMs. To detect stator winding short circu...

This paper proposed an improved full-order sliding-mode observer (IFSMO), applied to a sensorless control system of surface-mounted permanent magnet synchronous motor (SPMSM), obtain high-precision rotor speed and position. First, the IFSMO method, which combines new function with variable boundary layer function, is presented suppress chattering accelerate convergence system. Meanwhile, since ...

This paper presents an observer-based robust control for mechatronic systems that utilize a surface-mounted permanent magnet synchronous motor (SPMSM). A mechatronics system with SPMSM typically comprises mechanical moving part (outer-loop) and power converter (inner-loop) to drive the motor. We explain dynamic modeling of provide brief discussion on disturbances in SPMSM. cascaded tracking err...

Aiming at the problem of uncontrollable magnetic field permanent magnet generators, a new hybrid excitation generator (HEG) with parallel circuit is proposed. The HEG consists combined rotor (PMR) and brushless electric (EER). PMR has surface-mounted embedded magnets. provides main air gap field, EER used to adjust field. operating principle electromagnetic design scheme proposed are given in d...

In this paper the influence of some design parameters on the cogging torque development by a surface mounted permanent magnet motor is investigated. The investigation is focused on the implementation of stator core skewing and dummy slots in the stator teeth and their influence on the cogging torque reduction of the motor. The cogging torque is calculated numerically for the different motor sol...