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A novel doubly salient permanent magnet motor named flux switch permanent magnet motor (FSPM) was designed and analyzed. The stator and rotor of FSPM are all salient structures. There are a marked verge domino effect and serious saturation phenomenon. Due to high nonlinearities of FSPM, finite element method (FEM) was used to analyze magnetic field distribution, permanent magnet flux linkage, electromotive...
This paper describes different arrangements for a dual-rotor, radial-flux, permanent-magnet brushless DC motor for application to variable-speed air conditioners. In conventional air conditioners, two motors of appropriate ratings are usually used to drive the condenser and evaporator separately. Alternatively, a motor with outputs on both sides of a common shaft may be employed and this is studied...
The permanent magnet synchronous machine with an external rotor is the most important device for high performance electrical drive systems in particular for hybrid electric vehicles. With such an application, the machine will operate in a wide speed range and on the other hand with very fast changing loads in both motor and generator operational modes. The paper discusses finite element analyses for...
The permanent magnet synchronous machine with an external rotor is the most important device for high performance electrical drive systems in particular for hybrid electric vehicles. The paper presents finite element analyses of a such a machine in terms of a comparison of both Y- and Δ-connected stator windings. The influence on the most important design parameters such as electromagnetic torque...
This paper deals with experimental works and analysis for influence of stator slot number on performance of interior PM (IPM) motor. First, for a conventional 6-pole IPM rotor, stators with 18, 27 and 36 slots satisfied with same required and restricted conditions are designed. And then, performances and parameters of each IPM motor such as cogging torque, torque ripple, d- and q- axis inductance,...
The three-phase flux reversal machine (FRM) is a double-salient stator-permanent magnet machine with flux Linkage reversal in the stator three-phase concentrated windings. However, there is notable PM flux leakage caused by its structure in flux reversal machine. This flux leakage deteriorates the performance of the FRM. In order to reduce the flux leakage, the researchers propose different improved...
The flux-switching permanent magnet (FSPM) machine exhibits the advantages of high power density and large torque capability. However, due to the high airgap flux density produced by magnets and the doubly-salient structure, the resultant cogging torque is relatively large, which is unfavorable for high performance drive system. In this paper, instead of conventional optimization on the motor itself,...
The paper presents impacts of the stator slot with skew and segment magnet rotor on the performance of interior permanent magnet (IPM) machine for an electric traction. Comparisons of the average torque, torque ripples, cogging torque and no-load back EMF with skew and un-skew are given and how suitable a segmented rotor IPM machine and its torque characteristic and the field weakening capability...
In direct-drive electric propulsion systems, where there is no reduction gear to minimize and absorb the adverse effects due to cogging torque generated by the permanent magnet (PM) machine, minimization of cogging torque generation is of particular importance. In this paper, a novel axial magnet pole pairing method is proposed to minimize cogging torque generation in a special three-phase outer-rotor...
The rotor of a typical water current turbine rotates below 100 rpm. In conventional hydro installation the generator is coupled to the turbine via a gear box, so that it can typically rotate at a speed of 1500 or 1800 rpm. The water current turbine can be simplified by eliminating the gear box and by using a low-speed generator, the rotor of which rotates at the same speed as the rotor of the turbine...
Several cogging torque minimization techniques exist for permanent magnet (PM) machines, and these are well documented in earlier studies. However, the majority are used to reduce the cogging torque in radial flux PM (RFPM) machines. In this paper, cogging torque minimization techniques for axial-flux PM (AFPM) disk machines are briefly reviewed, and one of the foremost cogging torque minimization...
The influence of various types of windings on the cogging torque and the total torque developed by a three-phase permanent magnet synchronous motor (PMSM) is investigated. The number of poles and rotor geometry are fixed and the stator slot number is modified. The finite element technique is used for the computation of the machine characteristic. The torque is determined by means of the Maxwell stress...
In these days, the choice of the right motor topology for industrial applications and household electrical appliances is a challenging quest. Since universal motors can not meet the ever-growing standards of electrical equipment design, new generations of electric machines compete to conquer this market. For industrial applications and home appliances, PMSMs seem to be the most fitted solution, especially...
A low-speed double disks type permanent magnet synchronous machine is proposed. The electrical machinepsilas stator slot number is close to the rotor permanent magnet pole number and the statorpsilas tooth width is close to a pole distance. The coils that belong to each phase are concentrated and wound on consecutive teeth, so that the end winding is minimal and the phase windings do not overlap....
A new type of three-phase permanent magnet synchronous machine (PMSM) with modular stator structure is proposed. Its structure and principle is introduced. The machinepsilas teeth width is equal to polar pitch, its stator winding is concentrated winding, each phase winding is wound up continuously and the ends of windings are shorter then conventional machines. Therefore, the machinepsilas efficiency...
The flux-switching permanent magnet (FSPM) machine exhibits competitive torque capability and power density due to the high flux density. As a penalty, the cogging torque is relative large, resulting in unfavorable torque pulsation. Due to the simple and robust rotor construction, additional dummy slots are adopted to reduce the cogging torque without skewing magnets or teeth. The optimal dimensions...
The doubly-salient permanent magnet (DSPM) motor employing straight rotor and concentrated windings is conventionally operated by means of current chopping control in constant-torque region and angle-position control in constant-power region due to the trapezoidal back-EMF waveform. However, the rotor-skewing method can be used to improve back-EMF and inductances waveforms to be sinusoidal significantly...
This paper presents a method to reduce the cogging torque of PM BLDC with concentrated windings by combining teeth notching and rotor magnets skewing. For motors with concentrated windings, the method of reducing cogging torque by skewing rotor magnets is not quite available because of the large slot pitch. Then the method of teeth notching is also introduced in. The number of notches that should...
Vernier motors are known as a large torque machine. Its feature is most suitable for linear direct drive system. However, in general, linear machines have a large cogging force and pulsating force, due to the end-effect. Therefore, the authors have studied an improvement of the force characteristics in a linear permanent magnet vernier motor, which is the type that has small magnets on both the stator...
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