The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper compares two torque control methodologies, namely Field Oriented and Model Predictive ones, for monitoring Interior Permanent Magnet Motor (IPMM) over a wide speed range. IPMM magnetic saturation and cross coupling effects are taken into consideration, increasing significantly the precision of the developed controllers. Maximum Torque per Ampere (MTPA) and Field Weakening (FW) operating...
The switched reluctance motor (SRM) is suitable for high-speed driving and enables high output. However, it is less efficient than other motors. This is due to an increase in iron loss caused by high speed operation. Therefore, in this paper, we adjusted firing angle and verified that firing angle realizing maximum efficiency exists by changing current waveform and loss. It was confirmed that the...
A switched reluctance bearingless motor (SRBM) with single layer windings is presented. Particular effects of eddy currents on iron losses, torque and radial forces are analysed. A new principle to explain distribution of magnetic flux in motor sheet caused by eddy currents of frequencies from 3 000 Hz to 90 000 Hz is introduced. Iron losses, torque and radial forces are new estimated and calculated...
This paper investigates a functional electrical stimulation (FES) cycling system on velocity tracking control for human limbs in order to stimulate multiple muscle groups continuously and simultaneously at all angles during pedaling. A stationary cycle and rider is modeled as an Euler Lagrange system by using a closed-chain mechanism. Stability of the developed controller is analyzed through Lyapunov-based...
Two common rehabilitation therapies for individuals possessing neurological conditions are functional electrical stimulation (FES) and robotic assistance. This paper focuses on combining the two rehabilitation strategies for use on the biceps brachii muscle group. FES is used to elicit muscle contractions to actuate the forearm and a rehabilitation robot is used to challenge the muscle group in its...
Sit-to-stand transition is an essential step in a lower limb rehabilitation therapy, mainly for assisting the patient to transit from wheel chair to the next level of therapy. A mixed stiffness-damping control adaptation is proposed for this task which will help in reaching the final position with a constant velocity. A combination of control model is proposed to ensure the initiation and the final...
The improvement of movement smoothness over the course of therapy is one of the positive outcomes observed during robotic rehabilitation. Although movements are generally robust to disturbances, certain perturbations might disrupt an individual's ability to produce these smooth movements. In this paper, we explore how a rehabilitation robot's inherent dynamics impact movement smoothness during pointing...
Functional electrical stimulation (FES) is a promising solution for restoring functional motion to individuals with paralysis, but the potential for achieving full-arm reaching motions with FES for various desired tasks has not been realized. We present an open-loop controller capable of calculating and applying the necessary muscle stimulations to hold the wrist of an individual with high tetraplegia...
In this paper, a feeding rate wireless testing method of combine harvester which based on the torque measurement of auger sprocket wheel is described. Wireless torsional strain gauges were designed and fixed in the refitting sprocket, which is used to detect the flow rate of collected corn in a form of torque, and the wireless data transportation is realizing by wireless launching and receiving module...
Conventional Maximum Torque-Per-Ampere (MTPA) control was derived from the three-phase induction machine model ignoring iron loss. A new MTPA control is proposed in this digest, whose accuracy is improved by considering machine iron loss using a newly published induction machine iron-loss model. The detailed derivation of the proposed MTPA control and possible enhancement of torque-per-ampere capability...
This paper presents design study on windage loss reduction for hybrid excitation flux switching motor employing two types of rotor structure. Conventional flux switching motors have a rotor structure with salient poles, by which windage loss at high speed region becomes serious. To reduce the windage loss, two types rotor are built: One is a cylindrical rotor employing iron rib between adjacent salient...
This paper presents a method for evaluating, both qualitatively and quantitatively, the effects of specific rotor design parameters on the performance of a Synchronous Reluctance Machine (SynRM). The method uses multi-factor experimental design, with Analysis of Variance (ANOVA), and Finite Element Analysis (FEA) to determine the optimal rotor design parameter according to a specific objective. Using...
An interior permanent magnet (IPM) machine applied in rail transportation is designed and optimized in this paper. A quasi-octagonal stator iron yoke is adopted in the machine in order to meet the requirement of the installation while the parallel slot structure is also employed due to the arrangement of the performed windings. The method of equivalent stator slot is proposed in this paper to analyze...
This article aims to find an efficient and precise way to take into account mechanical stress constraints during the electromagnetic optimization of a 3-levels flux barriers ferrite assisted synchronous reluctance machines. Beside the wish to obtain the best shape of flux barriers leading to the highest performances, we have to insure the mechanical integrity of the structure especially at high speed...
This paper presents an investigation into the applicability of a new fractional slot concentrated winding with improved magneto motive force, however with low winding factor for the fundamental wave, for traction machines. For comparison, a common used distributed winding is considered as reference design. Two different synchronous reluctance motors have been designed and analyzed under the same geometric...
The design of synchronous reluctance machines for high-speed applications is an issue that nowadays remains almost not dealt with. The thickness of the iron ribs that mechanically sustain the structure increases with the rotor speed, so that a high magnetic flux flows through them. Therefore, the available torque decreases with the rated speed required by the application. The aim of this paper is...
This paper presents a loss model based nonlinear control of interior permanent magnet synchronous motor (IPMSM) drive. Traditionally, the dynamic performance of the drive is often ignored for any loss model based controller (LMC) development. Therefore, in this paper an LMC is integrated to an adaptive backstepping based nonlinear controller in the design stage. In order to cope with parameter uncertainties...
Micro-hydroelectric power plants exhibit low efficiency due to the small size. For this reason, the selection of a high-efficiency electrical machine is particularly important in order to improve the performance of the generation system and to respect the energy policies. In this paper, the performance of different types of machine are computed and compared. In particular an Induction Machine (IM),...
This paper presents a partitioned stator (PS) switched flux permanent magnet (PS-SFPM) synchronous generator (PS-SFPM-SG) and its electromagnetic characteristics under different load conditions. The adopted PS structure enables the PS-SFPM-SG to achieve higher power and torque density due to enlarged slot space for the armature windings by moving PMs to an inner stator. Hence, the space conflict between...
Axial flux machines (AFMs) are used in applications that require high power and torque densities in a pancake-type form factor. There are various types of AFMs based on the configuration of the rotor/stator and magnet orientation. In this paper, a comprehensive analysis and comparison of AFMs with different rotor and stator configurations are presented. Considered topologies are: slotted AFMs with...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.