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This paper proposes an improved current control scheme for the rotor-side converter of a doubly-fed induction generator (DFIG) wind power generation system. The control scheme consists of a proportional (P) controller and a harmonic resonant (R) regulator tuned at the grid frequency. Thus, the positive and negative sequence components of rotor current are fully regulated by the PR controller without...
This paper presents a comparative study on four different structures of variable speed constant frequency (VSCF) wind power generator. The analysis results show that the direct-driven permanent magnet (PM) generator has good performance but high cost; the doubly-fed induction generator has low cost but poor reliability; the half-direct-driven PM generator and doubly-fed brushless generator may be...
In the recent years a lot of electrical motors have been developed for their purpose. Their requirements are high efficiency, less cogging torque, long life and high speed etc. The conventional DC and normal BLDC motors cannot fill the requirement for special purpose. For high speed and high efficiency and no torque ripple is a double cylinder motor suggested which has an air-gap-winding and rotating...
SRM is suitable to be used as drivers of electric bicycle (E-bike). A nonlinear dynamics model based on Matlab/Simulink of E-bike and four regenerative braking strategies of SRM are presented in this paper, such as most feedback power control strategy, most feedback efficiency control, fixed torque control, fixed feedback current control. A hybrid control strategy of PWM mode and current chopping...
Switched reluctance motors (SRM) have gained more popularity in recent years because of their simple structure, low cost, high reliability, and high torque-to-mass ratio. However, the applications of the SRM have been limited because of their large torque ripple, which causes noise and vibration problems. In order to solve these problems, Ca novel direct torque control (DTC) methodology is directly...
Consideration of the structure and the operation principle of Switched Reluctance Motor (SRM), it is possible to obtain super high speed drive. Therefore, a three-phase 6/2 SRM, the speed of which is 130,000 rpm, is adopted for super high speed drive. Based on the two-dimensional finite element method (FEM), the torque-angle characteristics of 6/2 SRM are analyzed and the motor structure is improved...
This work presents an optimum approach to design PI controllers of permanent magnetic brushless DC motor (PBLDCM) to solve the traditional shortcomings of the existing PI algorithm. The primary design goal is to optimize the transient response by minimizing the maximum overshoot, settling time, rise time of step response. This study proposes a non-liner PI controller based on ant colony system (ACS)...
A brushless doubly-fed machine with tooth-harmonic wound rotor is a new type of BDFM. The machine is intended for use as a variable speed generator, or drive. Maximum torque output may be obtained by optimally dividing the overall magnetic loadings and electric loadings between the stator windings attending by reasonable rotor winding. This paper proposes an improved particle swarm optimization algorithm...
High speed compact BLDCM (Brushless DC Motor) is much used for a robot and medical application because of the high torque and high speed characteristics. This paper presents a simple PLL based speed control scheme for a high speed compact BLDCM. Without any complex calculation of actual speed and design of speed controller, a simple phase difference between reference and actual hall sensor signal...
Permanent magnetic gear (PMG) is a new kind of non-contact power transmission device which has unique advantages to be applied in the situations of airproof and small vibration requirements. A new kind of large torque permanent magnetic gear box with flexible transmission ratio is introduced in this paper. Research on principle analysis and transmission characteristics were carried out on the basis...
The objective of our research is to investigate the performance evaluation of traveling-wave ultrasonic motor with two-degree of freedom (2DOF-USM). The space structure of 2DOF-USM is introduced briefly. The mathematic model of the motor is established based on friction drive mechanism. Through relation of space location, calculating the driving force and friction force at arbitrary point of contact...
Interior permanent magnet (IPM) electric machine is not a pure PM machine but a mixture of permanent magnet and synchronous reluctance electric machines. As a mixed electric machine, an IPM machine has two components to consider based on many parameters. Synthesis of new dimensionless indexes based on machine parameters is proposed. It is to shown that the new pair of dimensionless indexes, chi and...
A permanent magnet dual mechanical port machine (DMPM) is a compact and pure electrical solution to the hybrid electric vehicle traction, which features as two independent rotors and permanent magnets mounted on the outer rotor. The key barrier prevent the DMPM from practical usage is the existence of the brush and slipring. A way to eliminate the brush and slipring is presented in this paper, which...
The parameters of permanent magnet synchronous motors consists of flux leakage coefficient, direct-axis synchronous reactance, quadrature-axis synchronous reactance and the ratio of two synchronous reactance. They all can influence the performance of permanent magnet synchronous motor such as pullout torque, pull in torque and starting torque. The calculated accuracy of the parameters above mentioned...
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...
A combined method of stationary finite element method (FEM) and time-stepping FEM is proposed to calculate the pull out torque of line start permanent magnet motor accurately and efficiently. The power angle characteristic was obtained with stationary FEM, and then the critical step-out power angle and the field-circuit result corresponding to the critical condition can be acquired. On the basis of...
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...
This paper proposes a novel control method that uses current harmonics to minimize torque ripple for permanent magnet synchronous motor (PMSM) applied to electric power steering (EPS) system. In the EPS system, PMSM is accompanied by magnetic saturation of iron core due to high power and limited space. Partial magnetic saturation in the stator teeth results in significant torque ripple. In order to...
Firstly, the topology and operation principle of the permanent-magnet BLDC motor for automatic door are researched in the paper. A method for decreasing cogging torque by cooperating of pole number and slot number is given. To increase the inner space utilization rate and the motor efficiency, the double-layer-and-short-pitch windings are employed. Secondly, taking terminal voltage as input, transient...
This paper deals with design criteria and characteristics analysis included electromagnetic losses analysis of a high-speed permanent magnet synchronous motor for a 7.5-kW, 60-krpm class centrifugal air compressor. In order to design this machine, we introduced analytical techniques, such as the electromagnetic transfer relations theorem and equivalent magnetic circuit method. And, from the curve-fitting...
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