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In this paper discussed how to determine synchronous generator parameters by using Matlab/Simulink program through load rejection test, and also show how to calculate the fundamental parameters which are important in the synchronous generator.
The design employs direct drive torque motor to achieve a robot single joint with active compliance based on the impedance model. In order to maximize the torque density, transmission transparency and backdrivability, the joint employs a quasi-direct actuator that a single-stage planetary gear is mounted on the motor's rotor. When robot interacts with environments, it's inevitable to change the stiffness...
Very less research is conducted on limited angle Magnetorheological (MR) damper compare to continuous angle Magnetorheological dampers. Despite of fact that limited angle MR damper cannot rotate continuously but can have ability to produce more damping torque than continuous angle MR dampers. There can be several applications of vane type MR dampers on which research can be conducted for example in...
The multiplex 3-phase winding motors suffer from the problem of the magnetic coupling between the normal winding and the fault winding. To investigate the behaviors of the dual-winding PMSMs on the short-circuited fault conditions, a fault analysis model is developed that includes a dual-winding PMSM circuit model with a short-circuited fault coil within some phase coil and an inverter model with...
With the development of the smart meters, demand response (DR) is able to provide fast ancillary services, such as frequency control. Some recent studies demonstrated that DR can perform like thermal generators in the frequency control. However, little attention has been paid to DR's effect on the electromechanical oscillations of the power system. Fast-response DR can not only affect system frequency,...
In this paper there is detailed the asynchronous operation caused by an important overload, of a synchronous motor. There are mentioned the currents of all the windings, main flux, electromagnetic torque, electrical angular speeds of the rotating field and of the rotor which define the amplitudes of the electrical, magnetic and mechanical stresses. The effect of the damping windings resistance in...
The marine industry is seeing an increasing number of vessels equipped with electric propulsion opposed to traditional mechanical propulsion. Electric propulsion has been shown to be advantageous in various land applications such as locomotives and road vehicles however in the marine setting the highly variable hydrodynamic load exposes the electric propulsion system to extreme load conditions. This...
Aiming at the difference between conventional power electronic interface converter and traditional synchronous generator in microgrid, it cannot provide inertial support and damping effect for microgrid. In this paper, a converter based on virtual synchronous generator technology is used to design the power outer loop and the electromagnetic equation, so that the power electronic converter has some...
In 2015, InnaLabs reported on the development of a range of specialist, precision Quartz Pendulous Accelerometers. The performance requirement for these accelerometers was a key design driver for meeting the market needs within the tactical and the navigation grade market segments. In order to extend InnaLabs offering to cutting edge, volume applications with more stringent and highly dynamic environments...
This paper is concerned with the increase of the damping behavior of an engine test bed by suitable extending the control strategy of a standard engine test bed with respect to the test of high charged, small displacement combustion engines used in modern hybrid powertrain concepts. Especially in high performance engines (e.g. such as for race cars) the outbid boosting with electrical driven turbo...
This paper analyzes the resonance phenomenon that occurs in the uncontrolled slave motor of two surface mounted permanent magnet synchronous motor (SPMSM) drives, connected in parallel to a single inverter. This phenomenon is observed when the inverter is controlled by the master-slave method, due to the differences in parameters between the two motors and load, during medium and low speed operation...
Knee exoskeletons can help injured subjects regain locomotion ability by providing external movement compensation as a robot-assisted rehabilitation technique. Tracking control of joint angle of knee exoskeletons often encounters time-dependent (time-varying) model parameter issues, which would dramatically put an influence up on dynamic behaviors. In a number of applications, inertial and viscous...
In this study, a fault detection algorithm based on Kalman filter approach based on the tire rotational dynamics is proposed to identify bearing fault in wheels of four in-wheel motor electric vehicles. If one wheel with partial fault is detected, feedforward compensation of bearing damping torque is added to the wheel motor torque distributed by the control allocation which integrated the MTTE-Maximum...
This paper presents the design and characterization of a power-asymmetric actuator for a transtibial prosthesis. The device is designed to provide the combination of: 1) joint locking, 2) high power dissipation, and 3) low power generation. This actuator functionality allows for a prosthesis to be designed with minimal mass and power consumption relative to a fully-powered robotic prosthesis while...
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...
This paper describes the methods and experiment protocols for estimation of the human ankle impedance during turning and straight line walking. The ankle impedance of two human subjects during the stance phase of walking in both dorsiflexion plantarflexion (DP) and inversion eversion (IE) were estimated. The impedance was estimated about 8 axes of rotations of the human ankle combining different amounts...
Tremor is the most common movement deficit and manifests in a variety of disorders, including Essential Tremor, Parkinson's Disease, Dystonia, and Cerebellar Ataxia. Although medication and surgical interventions have significantly reduced patient suffering, they are only partially effective and can carry undesired side effects, leaving many patients without satisfactory treatment options. Wearable...
In this paper, an active impedance control strategy for a knee-joint orthosis is proposed to assist individuals suffering from lower-limb muscular weaknesses during the swing phase of walking activities. The goal of the proposed strategy is to decrease the human effort required for ensuring a successful knee joint movement during walking without sacrificing the wearer's control priority. In this study,...
In the conventional variable speed drive, the dc-link including the dc-choke and electrolytic capacitor is bulky with limited lifetime. The slim dc-link drive is thus proposed for the lower cost and longer lifetime by using the film capacitor to replace the electrolytic capacitor and dc-choke. However, such drive system suffers from the potential instability issue, due to the negative incremental...
Common opened-loop I/f control method for permanent magnet synchronous motor(PMSM) has several defects in practice like the low efficiency, vulnerability in losing synchronization under sudden load circumstance. This paper presented a new closed-loop sensorless I/f control method for IPMSM drives. In order to achieve maximum torque per ampere(MTPA) status, the reactive power is observed to regulate...
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