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This paper presents the sensorless control method that employs the adaptive back-EMF(Electromotive Force) and current model observer(CMO) of interior permanent magnet synchronous motor(IPMSM) with improved instantaneous reactive power compensator(IRP). The estimated back EMF considering a saliency is obtained by using the adaptive control method. The estimated EMF is inputted to the CMO for estimating...
In this paper, a sensorless drive of switched reluctance motor without predefined parameters is proposed to simplify the application of SRM. To avoid additional cost and unreliability caused by sensor device, sensorless control technology of SRM has attracted increasing attentions and obtains considerable development over recent years. The main idea behind most existing sensorless control strategy...
The semiconductor industry demands for pumps which handle aggressive fluids at very high temperatures, as this is an important step towards higher process speeds and increased yield in semiconductor etching applications. This paper presents the thermal, electrical and mechanical design of a bearingless pump for operating temperatures of up to 250 ° C without active cooling. A detailed thermal analysis...
In this paper, a sensorless control scheme using improved stator flux estimator for high speed induction motors has been proposed to compensate a Programmable Low Pass Filter. This paper has analyzed the affect between the estimated speed error and the phase error of the stator flux in high speed range. The estimated speed error compensation scheme has also proposed. The validity of the proposed schemes...
A novel sensorless control method of Switched Reluctance Motor (SRM) based on crossing point of transformer electromotive force (EMF) and motional back electromotive force (BEMF) is proposed in this paper. The crossing point position can be derivate from inductance mode, and it is regarded as a reference point to estimate rotor position. The rotor position can be estimated by detection of the special...
Complementary and modular linear flux-switching permanent magnet (MLFSPM) motor with magnets and armature windings in the short primary mover is a viable candidate in long stator application because of its faster dynamic performance and lower cost. In this paper a sensorless control strategy of MLFSPM motor based on model reference adaptive system (MRAS) combined with space vector modulation technique...
In this paper, a novel high-frequency (HF) injection method of sensorless drive for doubly-fed induction machines is proposed. The high-frequency voltage is injected into the rotor winding and according to the concept of synchro, the rotor position can be simply extracted from the phase difference among the stator current and the rotor current regardless of machine and grid parameters. In addition,...
In this paper, a model-base approach is employed for the rotor-position estimations of doubly-fed induction machines. Two types of adaptive reduced-order observers; based on stator and rotor models, are conducted in order to estimate the rotor position and rotor speed simultaneously. The proposed estimations schemes are straightforward and simplicity for implementation regardless of the knowledge...
To overcome the drawbacks of conventional I/f scalar control method, the limits of the current amplitude and torque angle have been investigated. In this paper, the closed-loop I/f sensorless control strategy based on direct current vector oriented is proposed. The key of this strategy is to integrate the torque angle loop using instantaneous power estimation into the I/f scalar strategy. Thus, the...
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