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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...
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...
This paper introduces a vision-based position detection method for spherical stepper motor. For the absolute orientation information of the rotor, a new grid pattern and new image analysis method to get the characteristic points are presented. According to the location of the characteristic points and methods in photogrammetry, the rotation matrix can be obtained, so the goal of position detection...
A sensorlesss vector control system of PMSM compressor is presented in this paper. By calculating the magnetic flux linkage, the position of magnetic pole and the speed of the compressor are estimated. To realize the low cost sensorless control, an 8-bit high performance microcontroller-XC886 is used. Phase currents measurement based on shunt resistors in lower legs is adopted to simplify the circuit...
Condition monitoring of electric machines is of increasing importance. The continuous assessment of the machine performance allows to schedule appropriately maintenance operations, thus increasing machine operating life and reducing repair cost. The input current spectrum is a wide spread procedure for non-invasive diagnosis of induction machines. Information on rotor variables are available only...
Soft magnetic composites (SMCs) are today a viable alternative to steel laminations in a range of new applications, such as rotating machines, sensors and fast switching solenoids. SMC components are successfully manufactured using the powder compaction process. The isotropic nature of the SMC combined with the unique shaping possibilities makes available 3D-design solutions such as described herein...
In this paper a back-EMF-based method is used in conjunction with three very low-cost integrated circuits based on the Hall-effect to estimate the rotor position of direct-drive PMSMs to be used for traction purpose of an electric wheelchair. A speed estimator based on rotor frame machine model (SERF) has been implemented for the PMSM drives, and then the rotor position estimation is achieved by means...
This paper presents a novel high frequency driven induction motor. Its rotor conductor structure, which has only single-phase winding, is different from the squirrel-cage rotor. Its single-phase short-circuit rotor windings exhibit different inductance distribution at different rotor position corresponding to stator winding. This phenomenon is similar with the reluctance machine. In order to start...
This paper describes a fault tolerant controller for high performance induction motor drive. The proposed approach aims to make the motor tolerant to both internal and external factors such as loading, temperature and sensor failure. To achieve this goal, a controller that switches itself between a control strategy designed for nominal operation and a robust control strategy designed for faulty conditions...
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
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