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In this paper, a novel 12/14 bearingless switched reluctance motor (BLSRM) with a biased permanent magnet is presented. For this novel 12/14 BLSRM structure, the torque control can be naturally decoupled from the levitation force control according to the principle of the BLSRM. Based on the novel structure, a control system is designed to verify the performance of the proposed BLSRM. On the basis...
In this paper the effect of load pulse timing on the shaft of an aircraft generator is studied on terms of endurance and ultimate stresses. For this, two types of loads connections are considered: step electrical load and pulsating electrical loads. For the first case, it is proposed that a correct timing of a pulse load connection can zero the transients on the shaft. After for the case of a pulsating...
This paper presents the improvements in the design of a three phase BLDC motor for noise reduction. The end application of BLDC motor is a ceiling fan. Acoustic noise spectrum of the motor is captured and analyzed. It is shown that, the cogging torque is the dominant cause of the acoustic noise. Two cogging torque reduction techniques namely — stator tooth pole shaping and magnet skew by single step,...
For the recently presented "Stator Cage Machine" an analytical calculation method is developed. First of all the magneto-motive force produced by the stator is analyzed and a definition for the number of phases of such machines is given. Following, parameters of the machine (resistance, inductivity and flux linkage) and the generated torque are calculated. As the machine does not contain...
A new method for the estimation of the quality factor and vibration amplitude of a piezoelectric-actuated system is described. According to the conservation of energy, equation between input electrical power and the energy dissipated in the mechanical part could be established. Given the piezoelectric actuator impedance and the system impedance, the vibration amplitude can be obtained in function...
This paper mainly studies the speed control for a permanent magnet synchronous motor (PMSM) system with parameters uncertainties and torque change. PMSM is a typical nonlinear multivariable coupled system, and is sensitive to the load disturbance and the changing of motor parameters. Hence, the drive performance of PMSM is deteriorated when faced with all kinds of disturbances. A new control algorithm...
An analytical model based on subdomain model method is proposed for surface-mounted permanent magnet synchronous machine (SMPMSM) with radial and parallel magnetized eccentric magnetic pole. Further back-EMF, cogging torque and electromagnetic torque is calculated by using this model. This method provides a useful tool to mathematically illustrate the magnets with different circumferential thickness...
This paper presents a method aiming to detect different inter-turn short circuit fault severity by analyzing zero-sequence voltage for a new five-phase fault-tolerant fractional-slot concentrated winding interior permanent magnet motor (FTFSCW-IPM). To eliminate the effect of common mode voltage (CMV) in single DC power supply application, fault severity analysis is conducted based on an open-end...
In permanent magnetic synchronous motor (PMSM) speed regulation system, the tracking performance and disturbance rejection property of the system are coupled when using conventional active disturbance rejection control (ADRC) controller, which complicates the parameter setting of the controller. A decoupled ADRC controller with position feedback is proposed in this paper. Extended state observer (ESO)...
This paper investigates the influence of the magnetic saturation on the transient performance of Synchronous Reluctance Motors (SynRMs). In addition, the stability limits for the SynRM are studied using a more accurate model. The saturation, cross-saturation and position effects on both direct (d) and quadrature (q) axis flux linkages are considered. A Finite Element Method (FEM) is used to obtain...
This paper presents the online identification method for interior permanent-magnet synchronous motor (IPMSM) drive system with the maximum torque per ampere (MTPA). The inductances of the motor are identified by recursive least square (RLS) method based on mathematical model, considering the flux saturation state. Using this technique, the improvement of the MTPA trajectory for IPMSM can be implemented...
This paper analyses the effect of stator or rotor lamination asymmetries (non-circularities) on magnetic vibrations and acoustic noise radiated by electrical machines, and more especially by permanent magnet synchronous machines. A theoretical analysis is first carried based on permeance / magnetomotive force model. Then, some full electromagnetic and vibroacoustic simulations are run at variable...
The evaporative inner cooling technology has a good application prospect in wind power generator. The system for wind power generator has a small inclination angle of 3–5 degrees and the two-phase flow instability has become more obvious. In this paper, the flow distribution characteristics of parallel inclined hollow conductors were studied through experiments and theoretical analysis, according...
Usually, SRMs are operated in discontinuous conduction mode (DCM), in which the phase winding is fully demagnetized to zero current before starting the next excitation. In CCM, the dwell angle is set so large that the phase current flows continuously and it results in a higher torque production. However, the behaviors of SRMs in CCM are highly nonlinear and it is difficult to predict the torque output...
The paper presents a variety of issues related to the development of a highly efficient electric drive having a synchronous reluctance motor. Results are presented on the comparison experiments investigating the characteristics of induction and synchronous reluctance motors. Conclusions are made concerning the economic feasibility of using a synchronous reluctance motor for a number of industrial...
Applications of switched reluctance motors (SRMs) are limited due to their high torque ripple that caused by the doubly salient motor structure and unbalanced electromagnetic torque. In this paper, two methods are presented to eliminate the torque ripple, including direct torque control (DTC) method and torque sharing function (TSF) strategy. The fundamental theories of the two control schemes are...
Lithium iron phosphate batteries (LiFePO4) are becoming one of the main power resources for electric vehicles (EVs), and the non-uniformity of cells in a battery pack has become the bottleneck to improve battery usable capacity. Many active balancing approaches are proposed to transfer charge among the cells to achieve the uniformity based on terminal voltage. This paper proposes a new balancing approach...
In this paper Permanent Magnet Synchronous Motor drive under space vector modulation is considered as a discrete event system. A modification of Park's transformation yields quadrature voltage in terms of discrete and continuous parameters which are used to derive a model for torque and flux in closed form. Based on this, a new internal model control scheme for the speed control of Permanent magnet...
This paper derives the process of three-dimensional space vector modulation scheme in detail, and apply it to the three-phase four-wire active power filter. The theoretical analysis and practical application prove that this kind of modulation is convenient and feasible in active filter.
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