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This paper deals with Torque Control Strategy of non-sinusoidal Brushless DC Motor based on fractional regulator. In this case, the dq components of the EMF are not constants. Then, the optimisation of the torque and the reduction of copper losses and torque ripples need to synthesize and to impose an optimal current waveform in dq frame. Also, the current regulators must ensure reference tracking...
As the execution component of the satellite attitude control system, the reaction flywheel adjusts the attitude of the satellite by outputting a accurate control torque. Therefore the torque control accuracy of the flywheel motor is important for the control accuracy of the whole attitude control system. In this paper, the flywheel motor is a square-wave brushless DC motor, which is of simple structure...
The paper deals with isotropic PM-brushless drives in configuration “single-inverter, dual-motor” operating with unbalanced load-torques. After a short review of some control techniques based on the classical control methodologies of single-motor PM drives, an innovative control algorithm is presented. It is suitable to minimize the resultant armature current needed to obtain an assigned resultant...
The control strategy which the direct self-control was proposed to brushless DC motor system achieved the high performance with its simple structure and the torque control was the center. However, at lower speed, the distortion of stator flux-linkage waveform made the operating performance of brushless DC motor lower as the impact of stator resistance voltage drop. Thus, a new approach was brought...
Recently, direct torque control (DTC) has been applied on brushless DC motor (BLDCM). As the result of uncertainty of voltage across the off-phase, the stator flux-linkage changes its value periodically every sixty electric degree. The basic direct self control (DSC) strategy for BLDCM solves these problems, just as this paper presented. The simple structure is holding while the high performance is...
The paper deals with description of two tested control algorithms for permanent magnet synchronous traction motor (PMSM), which uses DSP TI 2812. The first of the algorithm was phase current control algorithm based on sinusoidal commutation of brushless DC motors. The algorithm was improved by induced voltage compensation to reach better transient behavior in higher frequencies. The second algorithm...
This paper deals with an extension of Park's transformation to model permanent magnet (PM) non- sinusoidal machines by means of the so-called pseudo-dq axes reference frame. Speed and torque vector control can then be implemented resulting in a motor drive performance close to that of sinusoidal PM machines drives. Similarly, the proposed control algorithm is derived by decomposing the machine current...
A newly control strategy for brushless dc motor drives is present. The three-dimensional X-Y-Z coordinate is adopted, and the off-phase axis is put on the Z axis, while the axis of two excited-phases on the XY plane. Compared with the complicated three dimensional locus of voltage vector and flux-linkage vector, their projections on XY plane are more concise. The projections of voltage vector are...
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