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A new rotor position sensorless method for switched reluctance motor drive system (SRD) is described in this paper. Rotor position can be considered as a function of phase current and the variation rate of it. Using the phase current obtained by sensors and the current variation the rotor position can be estimated accurately and quickly. A control strategy of SRD without position sensor is researched...
Sensorless Brushless DC motors have been a research focus home and abroad, because their characteristics of small volume, high reliability, strong anti-interference and the ability to overcome inaccurate commutation caused by mechanical installation. This article will carry on a research on the operation principles and performance characteristics of sensorless DC motors and methods that terminal voltage...
This paper presents a new concept of a flying and driving vehicle with a quadrotor structure. Design and control of an omni-directional quadrotor vehicle called Omni-Flymobile are presented. Omni-Flymobile is a form of a quadro copter with four wheels known as a kind of a quadrotor helicopter which has four actuating fans. Omni-Flymobile is designed for both the capability of flying in the air and...
With the purpose of improving the operation efficiency of wind power generator, this paper, by analyzing the doubly-fed induction generatorpsilas (DFIG) power characteristic, built up the DFIG active power reference calculation model to achieve the maximal power point tracing (MPPT) and the reactive power reference calculation model to minimize generator loss. The stator flux-linkage oriented vector...
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...
In order to control the speed and/or position of permanent magnet (PM) motors, they require position sensors. Basically, the auto-commutation needs 3 sensors for a 3-phase motor. In micro-motors, as there is no space for the sensors, self-sensing must be used. With big motors, suppression of the sensors enhances the overall reliability. The motor becomes a sensor itself and electromagnetic phenomena...
One position controlling source using sinusoidal wave by CPLD through linear amplifier technique for driving ring-type traveling-wave ultrasonic motor with 30 mm diameter of the stator (RTWUSM30) has been proposed and designed in this paper. The driving and controlling signals can be adjusted the frequency, the phase, the amplitude, and the phase difference of the two sin wave exciting signals through...
This paper proposes a mathematic nonlinear model of phase flux linkage in terms of Fourier series expression and a phase torque model based on adaptive neural fuzzy inference system (ANFIS) to a 6/4 switched reluctance motor(SRM). The novel model for SRM and the switched reluctance drive system based on Matlab/simulink is developed. The various control strategies, such as the chopped current control...
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...
The doubly-salient permanent magnet (DSPM) motor employing straight rotor and concentrated windings is conventionally operated by means of current chopping control in constant-torque region and angle-position control in constant-power region due to the trapezoidal back-EMF waveform. However, the rotor-skewing method can be used to improve back-EMF and inductances waveforms to be sinusoidal significantly...
This paper describes the temperature analysis due to core and copper loss in switched reluctance motor (SRM) by two-dimensional (2-D) finite-element analysis (FEA), which focuses on SRM used in position control of intelligent electric actuator. We discuss the effect of a convective heat exchange on the temperature rise, standard thermal boundary conditions are set up for the SRM model, and the temperature...
Generally, a back electro-motive-force or flux observer is used for position sensorless drive of permanent magnet synchronous motors from middle to high speed range. Thus, the estimation accuracy of the observer influences position sensorless drive performance. This paper proposes a position sensorless drive system using the Hinfin flux observer in which the observer gain is designed by using the...
It is well known that the system performance of field oriented control induction motor drives degrades under the variation of rotor resistance and in the presence of external load torque disturbance. H infin state feedback method is employed to design controller for induction motor fed by a current controlled voltage source inverter in this paper. The proposed control law can achieve convergence to...
This paper proposes a novel sensorless position control system for an interior permanent magnet synchronous motor. In this paper, a novel rotor position estimation technique is proposed. This estimation technique only relates to the slopes of the three-phase stator currents, and does not relate to the parameters or operating conditions of the motor. Neither extra circuit nor external exciting signal...
A trajectory tracking control scheme for the main rotor speed in an electrically powered helicopter prototype is presented. The scheme is based on the concept of differentially flat systems which makes use of a rotor model obtained with the help of an appropriate design and implementation of sensors and actuators. Experimental results are presented where the performance of the control scheme is evaluated
Active magnetic bearing is a promising candidate for next generation spindle motors of hard disk drives. In this paper, an iterative learning control scheme is proposed to suppress the rotor poison runout induced by the unbalanced forces in AMB. The ILC controller can produce the synchronous compensation force by iteratively "learning" rotor runout information. This compensation force makes...
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