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This paper presents the control and mechanism of a flying robot that uses a coaxial double contra-rotation rotor. The flying robot consists of two rotors, landing legs, and a body. There are three motors: two motors are employed to control two rotors, and the other motor is used to control the center of gravity. In addition, an ultrasonic range sensor is installed under the body to measure flight...
To optimise the performance of the wind generation, wind turbines employ variable speed (VS) variable pitch (VP) control system. Wind turbine is a complex nonlinear mechanical system exposed to uncontrolled wind profiles. Due to this, dynamic and parametric uncertainties arise in the mathematical model of the wind turbines over different operating conditions. This makes the turbine controller design...
A novel control method for Permanent Magnet Synchronous Motor (PMSM) position servo systems is presented, which can greatly improve the dynamic performance of servo systems. In this method, the maximum reaching velocity control is introduced to reconstruct the conventional three closed-loop PID regulators. Under the new velocity and position control modes (two-segment modes), the PMSM servo systems...
A correction factor fuzzy-PID control method is adopted in order to solve the vibration of elevator cab because of the edge effect in the linear elevators driven by the permanent magnet linear synchronous motor (PMLSM). The fuzzy control has the characteristics of being not completely dependent on the mathematics model, but the fuzzy control rules are obtained by experiences of authors or knowledge...
In this paper, a novel 2-degree-of-freedom hybrid magnetic bearing is presented which the static bias magnetic flux is produced by polarized permanent magnet ring and control magnetic flux is produced by currents in control windings. The mathematical models are deduced based on the introduction of working mechanism of hybrid magnetic bearing (HMB). A practical prototype bearingpsilas parameters are...
A new method of the model reference adaptive control for servo system what contains crawl phenomenon in a very low speed is presented based on hyperstability theory. In this paper, the mathematics model of the PMSM is studied, and basic hypothesizes is defined. The model reference adaptive controller is designed, and its stability is proved. Finally, the method is validated by simulating. Simulation...
A method of sensorless vector control with unity power factor for surface mounted permanent magnet synchronous motor (SPMSM) is presented. The method can realize the motor control of unity power factor under the rated speed, and the motor can also work normally under high speed by way of field weakening. Comparing with the vector control of the statorpsilas magnetic force plumbs with the permanent...
A dynamic decoupling control approach based on neural network inverse system theory is developed for the AC-DC 3 degrees of freedom hybrid magnetic bearing (AC-DC 3-DOF HMB), which is a multivariable, nonlinear, strong coupled system. The configuration of AC-DC 3-DOF HMB is introduced briefly. The mathematics equations of radial and axial suspension forces are deduced. The analytical inverse system...
Direct torque control (DTC) used in AC-drive locomotive control system, which has been developed in the recent decade, is a control strategies with high dynamic and static performance, and it directly generate the inverter gate control signal by judging the output of the stator flux, torque hysteresis comparator and the position information of the stator flux that cause the switching frequency unfixed...
In this paper a torque compensation technique for switched reluctance motor (SRM) is proposed. The conventional torque control with a simple current control loop usually causes large torque ripples and affects the speed response and overall performance of the drive system. The proposed torque compensation method is based on a torque estimation technique using the inductance profile and squared value...
The variable speed constant frequency (VSCF) wind power generation system requires the DFIG with characteristics of high response speed as well as strong robustness. Under the mutual effects of internal interference of parametric variation and external interference of load torque oscillation, the dynamic current response of PI control becomes worse, as well as reduced efficiency and stability. Aiming...
This paper presents a modified direct power control (DPC) strategy for a doubly fed induction generator (DFIG) based wind power generation system under unbalanced grid-voltage conditions. The strategy is based on the investigation of the mathematic model and the composition of the instantaneous active and reactive power outputted by DFIG. It is found that, by applying a notch filter of two times of...
Speed control of salient pole permanent magnet synchronous motor (PMSM) is studied based on energy-shaping and port-controlled Hamiltonian (PCH) system theory. Firstly, the PCH speed control model of PMSM is established. Secondly, the desired equilibrium point of the system is obtained based on maximum torque per ampere (MTPA) control principle. Then the speed controllers are designed when the load...
This paper mainly aims at the effects of different control methods on the precision of rotor position for a high speed machine with magnetic bearings. The conventional PID controller with two-level pulse width modulation (PWM) switching power amplifier makes the rotor position change on a large bandwidth. In this paper, the differential forward PID with three-level PWM switching power amplifier is...
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