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This paper is aimed at identifying the design parameters of a PM Assisted Synchronous Reluctance Motor (PMASyRM), by using cheaper magnets (for example hard ferrites) than those used for the equivalent stator of a Permanent Magnet Synchronous Motor (PMSM) taken as a reference. The rotor saliency is expected to be as high as possible so that its performance is comparable with the reference, while having...
In this paper an application of artificial neural controller for compensation of torque ripple in electrical drive with PMSM (Permanent Magnet Synchronous Motor) is presented. Due to cogging torque, electromagnetic torque ripple and also, current measurement error of the motor, are created a ripple of angular velocity, finally. This parasite phenomenon influence on the precision of control, especially...
Direct torque control (DTC), which is one type of PMSM drive system, can realize maximum-torque-per-ampere (MTPA) control and flux-weakening control by yielding an optimum target magnetic flux. In this paper, we propose armature reaction flux control that can achieve flux weakening control for PMSM control systems using DTC. Our proposed control focuses on the equivalence of the reactive power, which...
The output torque of an interior permanent magnet synchronous motor (IPMSM) can be controlled within its allowable range using a pulse-width modulation (PWM) inverter. In this paper, the effect of the load torque on the iron losses of an IPMSM is studied by investigating three driving conditions, namely no-current, no-load and load conditions. The experimental data demonstrates that a torque increase...
Stepping motors are well suited for open-loop positioning tasks at low-power. The rotor position of the machine can simply be controlled by the user. Every time a next pulse is sent by the user, the stepping motor driver excites the correct stator phases to rotate the rotor over a pre-defined discrete angular position. In this way, counting the step command pulses enables open-loop positioning. However,...
Wheel hub drives provide the opportunity to control the torque at every wheel independently. Thus, safety functions like anti-lock braking system (ABS) or electronic stability control (ESC) can be implemented in the drives as well. This enables the substitution of friction brakes at the driven wheels by electric drives. In this paper, resulting requirements for the drive system are presented and an...
The paper presents the results of field calculations of cogging torque of a 12-pole torque motor with an 18-slot stator. A constant angular velocity of the magnet and the same size gap between n-1 magnets were assumed. In these conditions, the effect of change of the nth gap between magnets on the cogging torque was tested. Due to considerable length of the machine the calculations were performed...
This paper experimentally confirms the operation of a new concept magnetization reversal motor. The motor uses conventional PM rotor, however, the stator is consist of small coercive force magnet for the stator teeth and the winding which magnetizes and demagnetizes the magnet. The magnet in the stator is magnetized by the pulse current injected at stator coil. Therefore, the stator can generate alternating...
The paper presents an analysis of influence of selected fault states on properties of brushless DC motor with permanent magnets. The subject of study was BLDC motor designed by the authors for unmanned aerial vehicle hybrid drive. Four parallel branches per each phase were provided in the discussed 3-phase motor. After open-winding fault in single or few parallel branches, a further operation of the...
The accurate knowledge of the machine parameters is a well-known important prerequisite for the inverter control design of variable speed drives. Due to the non-linear characteristics caused by cross-coupling and saturation effects the calculation of the inductances and in particular the magnetic flux of synchronous machines cannot be done straightforward. This paper presents a numerical stable method...
Energy saving is arguably the most important factor in issues regarding energy and carbon emission. For electric vehicles in particular, saving energy extends the driving range. This can be achieved with a highly efficient variable-speed drive that can cover a wide speed range, and changing the number of poles is one way of realizing such a drive. In addition, electric vehicles must be fault tolerant...
In this paper, we evaluate an effect of space factor of motor core on torque characteristics by using an interior permanent magnet synchronous motor (IPMSM). 2-D magnetic field analysis changing the space factor of motor cores and current phase angle is carried out to clarify the effect of space factor. The results show that torque has a peak value in 76% space factor even if current phase angle is...
Torque pulsation in permanent magnet synchronous motor impairs their performance in critical applications, particularly for direct-drive. A practical approach to compensation of selected torque harmonics is presented. The approach consists of two steps: identification of dominant torque harmonics (the cogging harmonics and the flux linkage harmonics) and cuckoo search algorithm to tune the compensation...
Recently, the increasing requirements and tendencies of higher efficiency systems have caused a substantial impact on electric motor design. Designers tend to change their views on motor topologies to provide the predetermined values of higher efficiency classes (such as IE3, IE4, IE5). Line-start interior permanent magnet synchronous motors (LSIPMSM) are strong candidates for higher efficiency class...
The article presents an algorithm and computer software for the optimization of excitation system of permanent magnet synchronous motor. The software consists of two independent modules: a module containing mathematical model of the device and an optimization solver. The mathematical model of the motor has been elaborated in the Ansys Maxwell environment. The Bat Algorithm (BA) has been applied in...
This paper proposes a method for direct torque control of Brushless DC (BLDC) motors. Evaluating the trapezium of back-EMF is needed, and is done via a sliding mode observer employing just one measurement of stator current. The effect of the proposed estimation algorithm is reducing the impact of switching noise and consequently eliminating the required filter. Furthermore, to overcome the uncertainties...
Medium voltage permanent magnet synchronous motor (PMSM) driven subsea pumps have the potential to improve system efficiency and reliability to lower the operating costs, and reduce the subsea pump module (PM) weight and size. These subsea pumps can be deployed in the well, in a dummy well or on the mudline in a skidded configuration. The higher speeds achieved by such motors, compared to the same...
In order to solve the conventional direct torque control contradiction between the dynamic and static performance, a permanent magnet synchronous motor system direct torque control architecture is proposed based on space vector modulation strategy. In this method flux and torque are controlled through stator voltage components in stator fluxlinkage coordinate axes and space vector modulation is used...
This paper presents the advances in the construction of a test platform whose main objective is to develop and validate control strategies on a traction wheel motor for electric bicycles (EB). It serves as a tool to evaluate strategies of torque and speed control, regenerative braking, pedaling assistance, among others. In the future, it is expected to obtain a controller to achieve a higher dynamic...
A winding design approach is proposed to create a single motor winding, which is able to produce both radial force and torque. This approach can be used to design new bearingless motors, as well as to transform conventional motor designs into bearingless motors by simply modifying the winding end connections. The resulting winding has two sets of terminal connections, one for torque and one for suspension...
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