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The effect of number of rotor slots on the stator and rotor current waveforms, slot and tooth flux densities and performance characteristics, such as torque, torque ripple, losses, electromagnetic force, power factor, and efficiency are numerically studied in case of a 3-phase, 8-pole squirrel-cage induction machine (IM). The IMs have been designed by using the same winding layout, stator outer diameter,...
Surface permanent magnet vernier (SPMV) motors are gaining more and more attentions over recent years due to their high torque density. Generally, most researches focuses on their applications in low speed, high torque area, and the study on their high speed operation is rarely seen. In this paper, a SPMV motor with 12 slot, 20 rotor pole is evaluated for traction application. The optimal designed...
In this paper, double stator axial field (AF) switched reluctance motor (SRM) was designed for automotive fan application to achieve higher efficiency more than the previously used BLDC and to compare it with 12/8 SRM and single stator AF SRM. The AF type motor has the advantage of producing higher torque per unit volume than radial type motor of the same size and volume. However, the force in single...
A six-phase permanent magnet synchronous machine (PMSM) with a new fractional-slot winding arrangement is proposed for the electric vehicle application. With a 105° electrical angle between the two sets of three-phase windings, the most harmful 5th harmonic in the air-gap magnetomotive force (MMF) can be completely cancelled in a 7-pair-pole machine. To highlight its advantages, a comparative study...
In this paper, the torque production mechanisms of integral slot distributed, fractional slot concentrated winding (FSCW) and Vernier permanent magnet synchronous machines (PMSMs) are firstly investigated together from the perspective of magnetic gearing effect. The torque contribution and magnetic gearing effect in eight 12-slot PMSMs with different rotor pole numbers are analysed and compared. The...
A new and improved technique is presented for the measurement of iron loss in motor stators. The most accurate existing technique rotates dummy-test rotors, one for each field strength of interest, inside the stators to be tested and measures the reaction torque on the stators. The new technique uses a wound ‘rotor’ component that does not rotate mechanically but does rotate electrically. Therefore,...
This paper proposes a Double-stator Flux Switched permanent magnet motor (DS-FSM) adopting stator-partitioned structure with double air gaps. The DS-FSM is designed and verified by finite element analysis (FEA). Compared with a conventional flux-switching machine using rare earth PMs and a single air gap, the proposed motor demonstrates higher torque density. The designed motors are then comprehensively...
Hybrid excited axial field flux-switching permanent magnet (AFFSPM) (HEAFFSPM) machine is a novel stator-excitation hybrid excited synchronous machine, which combines the advantages of AFFSPM machine and wound-field excitation machine. In this paper, the structure feature of HEAFFSPM machine is analyzed, and the mathematical model is established. In order to improve the power factor of drive system...
An electric machine with permanent magnets on both its rotor and stator is proposed and studied. The key idea is to using the bi-directional flux modulation effect to realize a structure with more rotor poles and less stator poles. Compared with the conventional machines with single-sided permanent magnet excitation, the proposed machine has more flexible pole-slot design when the pole number is large...
In this paper, a new single-phase flux switching axial flux permanent magnet motor (FS AFPM) is presented. It has a double stator and single rotor (DSSR) disc-type structure. The rotor disc is a simple salient pole rotor, and it is sandwiched between the two stator discs. The permanent magnets (PMs) are embedded in the stator discs, which also contain the single-phase windings. To enhance the self-starting...
This paper proposes a novel 16/10 segmented rotor switched reluctance machine (SSRM) for belt-driven starter generators (BSGs) of hybrid electric vehicles. The stator of proposed SSRM consists of two types of stator poles: exciting pole and auxiliary pole, and the rotor of proposed SSRM is made up of a series of discrete segments. Firstly, the concept of the conventional SRM and proposed machine is...
In recent years, the magnetic field modulation motors (MFMM) are attracting more and more attentions due to their compact structure and contactless torque transmission function, etc. However, multi-design parameters and output ports make the optimization for the MFMM necessary and difficult. In this paper, an automatic multi-objective optimization of the MFMM based on the advanced differential evolution...
The extensive applications of switched reluctance motor (SRM) have been limited due to its drawback of torque ripple. Thus, the reduction of torque ripple is an important problem in studying the SRM. A novel 16/10 segmented SRM (SSRM) is proposed in this paper. The proposed SSRM performs well in terms of torque ripple and tolerant-fault characteristic. The stator of the proposed structure is constructed...
Although the cogging torque in permanent magnet synchronous motor (PMSM) consists of several frequency components, the skew angle used to minimize cogging torque is generally determined to cancel the fundamental and sub-harmonics of the fundamental components. In a mass production environment, manufacturing variation always cause low order cogging components like slot and/or pole orders on top of...
This paper proposes a method to estimate the stator winding temperature of permanent magnet synchronous motor (PMSM) driven by direct torque control (DTC) strategy, where the stator resistance is used as a direct indicator of the temperature. In this method, the quantitative relationship between the dc current offset and the corresponding changes in torque is derived. The dc current offset is generated...
This paper proposes a novel nine-switch converter for the dual stator Doubly Salient Electro-magnet Motor (DSEM) in the compact driving system. The dual stator windings are connected to the dual output ports of the proposed converter, and both the operation principle and normal commutation method for the proposed system are analyzed. The interaction of the coupled outputs of the nine-switch converter...
This paper suggests asymmetric stator teeth design to reduce torque ripple and back EMF Total Harmonic Distortion(THD) for Interior Permanent Magnet Synchronous Machine(IPMSM). IPMSM which has 8 poles, 12 slots is analyzed in this study. From changing design parameter in stator structure, 8 comparison models are analyzed. Analysis of proposed method is carried out using Finite Element Method(FEM)...
This paper presents a novel 6/8 pole changing line-start permanent magnet synchronous motor (LSPMSM) which can decrease braking torque and pulsating torque fundamentally and improve starting capability effectively. The impedance parameters of 6-pole winding and 8-pole winding are calculated in use of two-dimensional (2D) finite element analysis (FEA). Then the bipolar dynamic simulation model is built...
This paper presents a comparative performance analysis of segmental type switched reluctance motor (SRM) for heating, ventilation, and air conditioning (HVAC) applications. Electric motors are the basic components of HVAC system, which control the airflow and therefore cannot be separated from it. Hence, a motor with high efficiency, high electric utilization, and variable speed drives is necessary...
In this paper, a novel single-phase hybrid switched reluctance motor (HSRM) is proposed for hammer breaker application. The hammer breaker requires only unidirectional rotation and high speed operation without torque dead-zone. To satisfy the requirements, the rotor of the 4/4poles proposed SRM is designed with wider rotor pole arc and non-uniform air-gap is applied on the rotor. This motor has a...
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