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Functional electrical stimulation (FES), applied to paralyzed or paretic muscles, can facilitate arm-free standing in patients with neurological disorders. At the same time, it has been shown that the able-bodied central nervous system regulates standing balance using a control strategy similar to proportional-integral-derivative (PID) control. The objective of this study was to investigate the capability...
Interior permanent magnet synchronous machine (IPMSM) has been widely used in traction application due to high efficiency and high power density. Nowadays, in electric vehicle application, the average efficiency over a driving cycle (AEDC) is more attractive than the efficiency over single working point. The paper deals with the design optimization of the average efficiency over a given driving cycle...
Current control of IPMSM servo system is investigated in this paper. Under the field-weakening control framework, nonlinear couplings of the voltage equations are very strong. The current control performance may not be well until such nonlinear couplings are well dealed. In this case, a DOB-based model predictive control is proposed to improve the current control performance under field-weakening...
This paper focuses on investigating the influence of design parameters on characteristics of external rotor permanent magnet synchronous machine (PMSM). Under the constraint of torque density, the effects of pole number and teeth height ratio on copper and iron losses are studied, as well as motor efficiency and winding temperature rise. Finally, to meet the need of the new micro-EV C11CB by Beijing...
Motor current signature analysis (MCSA) provides a non-invasive approach to diagnose the gear fault. The performance of MCSA at different speed and load torque conditions is studied using Fast Fourier Transform (FFT) to extract fault features. The results show that it would be better to perform fault diagnosis under low speed and heavy load conditions. And it fails when adopting FFT to diagnose the...
The external rotor surface permanent magnet (SPM) machine is attractively used for in-wheel traction application. In view of energy consumption, the efficiency of SPM machine over a driving cycle is more important than that at a single working point. This paper focuses on optimizing the external rotor SPM machine considering a target driving cycle. Under a target driving cycle, the whole motor working...
This paper investigates the electromagnetic performance of a 45-slot/10-pole interior permanent magnet synchronous machine (IPMSM) for electric vehicle. To meet the complex requirements of electric vehicle, the comprehensive electromagnetic performance of a 45-slot/10-pole IPM machine is predicted by 2-D finite element analysis (FEA), and compared with a 12-slot/10-pole machine, an 18-slot/10-pole...
Rotorcraft Aerial Manipulator (RAM) system is composed of a Rotorcraft Unmanned Aerial Vehicle (RUAV) and a multi Degree-Of-Freedom (DOF) manipulator, which is designed to fulfill aerial manipulation. Moments of inertia and center-of-mass position for RAM system vary when the manipulator moves. The influence of robot arm motion is treated as perturbations for RUAV in the process of overall system...
This paper develops a continuous second-order sliding mode control based on finite-time disturbance observer for light of sight (LOS) stabilized loop of inertial stabilized platform. The main purpose of an inertial stabilized platform is to eliminate the various disturbances to make the LOS keep steady in an inertial space. To accomplish the controller design, the equations of motion for a 2-DOF gimbal...
The rotor shape of external rotor surface permanent-magnet machine (SPM) substantially affects the induced voltage, the iron losses and the torque ripple, which are importance machine performances. This paper proposes a rotor design method to optimize these motor performances, by using rectangular magnet without complex shape. According to the rectangular magnet, a non-uniform air gap is obtained,...
To increase traditional direct torque control (DTC) of induction motor control precision and decrease large torque ripple, a Fuzzy PI speed controller was proposed. On the basis of conventional PI regulator, a Fuzzy PI speed controller was designed according to speed error and its rate of change, which could adjust the proportional coefficient kp and integral coefficient ki dynamically to adapt the...
In order to avoid the engine misfire, the misfire process of diesel engine was discussed with the method of crankshaft speed fluctuations. Based on the information synergetic theory, the misfire rate forecasting model of the engine was established and the engine misfire malfunction was inspected. The misfire diagnostic strategy of the diesel engine was put forward by the parameters on the rotate speed...
A dual speed loop cascade control structure using the DC tachometer motor to constitute the inner speed loop, and using the rate gyro to constitute the outer stabilized loop is presented since there is shortcome in single speed loop servo control composed of rate gyro for LOS stabilization in opto-electronic tracking platform system. The functions of reducing inner friction disturbance and bating...
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