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This paper describes a new position and speed observer, for BLDCPM1 motor drive sensorless control, based on the line-to-line PM flux linkage estimation. Line-to-line PM flux linkage can be estimated based on measured phase currents and line to line voltage. The zero-crossing of the line-to-line PM flux linkage occurs right in the middle of two commutation points, which is used as a basis for the...
This paper proposes a simple and effective scheme for Direct Torque Control (DTC) of Brushless DC Motor. Unlike the traditional DTC where both the torque and flux must to be employed in order to deliver the switching table for the inverter, the proposed DTC scheme utilizes only the torque information. By considering the particular operating principle of the motor, the instantaneous torque can be estimated...
In this paper the driving principle of a special permanent magnet excited synchronous machine, in the following called the switched permanent magnet reluctance machine (SPM), is discussed. The SPM is a promising variant of the brushless DC (BLDC) machine concerning design and robustness. The mechanical construction is similar to the switched reluctance motor (SRM), whereas the driving characteristics...
In this paper, the position sensorless direct torque and indirect flux control (DTIFC) of BLDC motor with non-sinusoidal (non-ideal trapezoidal) back-EMF has been extensively investigated using three-phase conduction scheme with six-switch inverter. In the literature, several methods have been proposed to eliminate the low-frequency torque pulsations for BLDC motor drives such as Fourier series analysis...
This paper presents the result of the two-dimensional finite element analysis on the effects of rotor pole arc variation and number of teeth per rotor pole with different teeth depths and stator excitation pattern on various performance parameters like cogging torque, developed torque, harmonic torques, torque ripple and phase inductance for an 6/8, three phase flux reversal motor. A novel excitation...
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