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The paper investigated the design of a new-type direct-drive axial flux permanent magnet (AFPM) synchronous in-wheel machine specially designed for electric vehicle applications. The machine configuration is simple and easy to manufacture. The machine has good performances such as phase EMF waveform close to sinusoidal waveform and low cogging torque. The electromagnetic design of 6.8 kW AFPM machine...
This paper presents the different calculating methods of stator end turn leakage inductance at brushless dc motors (BLDC) with different winding types. The calculations are carried both analytically and numerically. The results of the two dimensional (2D) calculations have been compared with the results of three dimensional (3D) ones for the same motor. Finite Element Method (FEM) is used for 2D and...
This paper presents a new decoupling method of the radial forces in a dual rotor-type magnetic suspension motor. The dual rotor-type magnetic suspension motor has been proposed by the author, and the motor structure and the principle of the suspension force generation have been introduced. However, it is possible that the mutual interference between the radial suspension forces in two perpendicular...
High efficiency motors driven at high speed are required in various applications. However, these motors suffer from excessive iron loss in the high-speed region. A number of structures have already been suggested for high speed drive. In this research, the motor with the concentrated winding stator and the motor with the slot-less stator are compared with respect to high speed drive characteristics...
A limited short circuit current PM motor is studied based on the segmentation of the rotor magnets. The principle is to reduce the magnetic flux by means of magnets subdivision and an increase of rotor pole number. The effect of magnet segmentation on machine characteristics is analyzed using finite element method (FEM). The short circuit current of designed fault tolerant machine is well limited...
Vibration and noise reduction is one of the most important requirements in the design of PMSM due to its direct impact on service life and operating stability. The radial electromagnetic force acted on the rotor is a major factor of a PMSM influencing on its vibration and noise. In this paper, the distribution characteristics of radial electromagnetic force were theoretically analyzed on the basis...
The effects of magnet faults on the rotor of permanent magnet synchronous machines are analyzed in the present work. In particular, demagnetization effects are analyzed using the finite element method. Two different stator winding configurations are considered in the analysis, series and parallel connected windings. From this analysis, a fault detection strategy based on the information contained...
The torque and unbalanced magnetic forces in a small flux concentrating permanent magnet transverse flux machine (FCPM-TFM) in segmented compact structure, which are the resultants of the tangential; axial and normal magnetic forces, respectively, are in general influenced by pole-teeth-winding configuration. The paper calculates the torque and unbalanced magnetic forces using finite element (FE-)...
A permanent magnetic synchronous motor(PMSM) used in pure electric vehicle(PEV) is introduced in this paper. The merits of high efficiency, wide speed range, high overload ability are required in PEV. An interior permanent magnetic synchronous motor is chosen, which is small volume, light in weight, simple in structure, high efficiency. The magnetic field of a prototype was simulated and calculated...
This paper deals with the influence of design parameters and dc link voltage on dynamic performance of slotless double-sided permanent magnet linear synchronous motor (PMLSM). Generally, the dc link voltage is not a design target to motor designers because of a fixed power by commercial voltage. However, in this paper, we will consider the dc link voltage from a different point of view for system...
Disc coreless permanent magnetic synchronous motor (PMSM) is a new permanent magnetic motor. It has many advantages, such as little volume, low mass, low lost, high power density etc. It gradually becomes the good choice in drive system. Its structure is introduced in this paper. The techniques of armature winding and the arrangement of permanent magnetic disc are emphasized. A calculation's model...
In recent years, interior permanent magnet synchronous motor (IPMSM) with concentrated windings has been interested as a smaller and higher-efficient motor than that with distributed windings. In this paper we have been analyzed the load characteristics of the eighteen IPMSM models with the various pole-slot combinations and the pole-arc angles using finite element method. The analyzed characteristics...
This paper deals with double-layer rotor design and design method of a single-phase line-start permanent magnet (LSPM) motor considering the efficiency and maximum torque with d-and q-axis equivalent circuit and finite element method (FEM). The motor parameters meeting the required efficiency, starting and maximum torque are determined by the characteristic map obtained by the d-q axis equivalent...
In this paper a simple dynamic model for a PMSM with inter-turn winding fault is derived. FEM is used for parameter determination of the machine with inter-turn fault. This fault model is used to study the behavior of the machine with inter-turn fault. The experimental test is conducted to validate the fault model for different levels of fault severity. The comparison of the results obtained by the...
In order to improve the reliability and output performance of the drive system of electric vehicle (EV), a new type of interior fault-tolerant permanent magnet motor (FTPMM) with centrifugal rotor is proposed, and its systematic characteristics are analyzed. With the proper connection of windings and combination of the number of slots and poles, the capacity of limiting of short-circuit fault current...
This paper presents the magnetic field analysis of a three-phase permanent-magnet motor performed through the finite element method. The machine used has nonsinusoidal flux and no conventional load torque. Its main application is in hermetic compressor household refrigeration systems.
This paper investigates an interior permanent magnet synchronous motor with 8 rotor poles and nonuniform (6+6) stator slots and concentrated windings fed with trapezoidal currents, in order to maximize the pole flux, while keeping a minimal level of cogging torque simultaneously. Dimensioning procedure of the proposed solution was done based on experience and it was validated using Finite Element...
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...
To satisfy the requirement of the low speed high torque permanent magnet synchronous motor (PMSM) used in the precise numerical control (NC) rotary table, the multipolar PMSM with similar pole number and slot number and unequal teeth structure is designed in this paper. This kind of motors can operate with lower speed, and the structure of similar pole number and slot number can reduce its inherent...
In this paper, a study focus on cost reduction of magnet material by utilizing the structure advantage of rotor design in a single-phase line-start permanent magnet motor (LSPM) is presented. Base on a prototype LSPM having single-barrier rotor structure, a double-barrier IPM rotor design is adopted for saving the permanent magnet material and maintaining the main machine performances. The advantage...
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