Dsp based bldc drive for automotive applications

Abstract

The Brushless Direct Current (BLDC) motor is nowadays well known for its superiority, due to its noise-free operation, flexible speed control, and high-speed range. Since the BLDC motor does not contain brushes, the commutation process is performed electronically in this motor. In this kind of commutation, position sensors are employed to obtain rotor position information with respect to stator winding. The Torque Ripple (TR), which commonly exists in the BLDC motor, restricts its application in high-precision drive system. Consequently, suppression of commutation by TR becomes the key to reduce the BLDC motor torque ripple. Hence, the Torque Ripple minimization has been highly concerned by the researchers in recent years. So far, many methods have been proposed to suppress the torque ripple. Generally, the DC link capacitor used in the drive has large weight and its lifetime varies adversely with the operating temperature. As a result, a low-cost capacitor based drive has been presented for BLDC motor and a Torque Ripple Compensation (TRC) technique has been utilized to reduce the torque. For mitigating the TR problem in BLDC motor, it is essential to make use of proper controllers and these controllers must cope with the TR problem without disturbing the motor speed. The TRC technique with low-cost capacitor is modestly associated with the conventional Torque Ripple Reduction (TRR) techniques. Furthermore, the performance of TRC technique can be augmented by introducing Spider Web-based Controller (SWC). By using this controller, the ripples in the torque can be confiscated. Finally, the experimental verification is done by designing the prototype and implementing the control scheme using dsPIC30F4011. newline