Simulation and research on torque ripple reduction for BLDC motors with non-ideal back EMF waveforms

Torque direct control method for BLDC motors with non-ideal back EMF waveforms;

Torque ripple suppression based on the non-ideal back EMF for brushless DC motor;

Calculation and simulation of back electromotive force and cogging torque for permanent magnet BLDC motor;

Back electromotive force was measured by continuous pulse-computer and the influencing factors for back electromotive force and current efficiency were studied in detail.

This method directly extracts the true back electromotive force(EMF) zero-crossing point by detecting the voltage difference between the floating phase terminal and the midpoint in the DC link.

A Novel Scheme of Sensing Rotor Position of BLDCM Based on the Zero-Crossing of Back EMF

The back EMF in the process of electrolysis is measured by continuous pulse-oscillograph.

When the transited current arrives at a certain extent, cell voltage and back EMF will be increased gradually with increasi.

One kind of sensorless control system for brushless DC motor based on DSP was introduced and the principle of back-EMF zero-crossing detection and realization method was discussed in detail.

The structure and characteristic of the band-pass filter are analyzed,and parameters of components are calculated,and a Back-EMF zero-cross detection circuit for BLDC motor sensorless control is designed in this paper.

This paper summarizes the principle of sensor-less BLDCM driving,and the method for fetching the rotor position and speed by zero-crossings of the non-conducted phase s back-EMF.