Precise Braking Torque Control for Attitude Control Flywheel With Small Inductance Brushless DC Motor

• Published in: IEEE transactions on power electronics Vol. 28; no. 11; pp. 5380 - 5390
• Main Authors: Zhou, Xinxiu, Fang, Jiancheng
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.11.2013; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Brushless DC motor (BLDCM); Brushless DC motors; dynamic braking; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical machines; Electronics; Exact sciences and technology; Flywheels; Inductance; Miscellaneous; Neural networks; plug braking; Plugs; Regulation and control; small inductance; Testing. Reliability. Quality control; Torque; Torque control; torque ripple; Various equipment and components; State feedback; Attitude control; Flywheel; Low speed; Hybrid control; Inductance; Brushless DC motors; High speed; torque ripple; Control method; Feedforward; Predictive control; Machine windings; Torque regulation; Control system; Motor torque; Electromotive force; Neural network; Brushless DC motor (BLDCM); small inductance; dynamic braking; plug braking; Reduction method; High voltage; Torque control; Ripple
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2013.2244617

In this paper, a newly designed braking torque control scheme with improved toque estimation and control characteristics in a small inductance brushless DC motor is presented. The motor torque is estimated according to the back electromotive force (EMF) shape function that is fitted by neural network and corrected by temperature. Upon this, a hybrid braking torque control structure that combines dynamic braking and plug braking is proposed for the smooth and continuous braking torque. These two braking modes operate, respectively, in the relatively high- and low-speed ranges. During dynamic braking, a predictive torque control method is proposed to suppress the torque fluctuation that is induced by the supplying voltage namely back EMF descent. During plug braking, an effective torque ripple reduction method is designed to weaken the large torque ripple which is caused by high winding voltage, low winding impedance, and three-phase inverter modulation. In addition, different pulse width modulation patterns and the most suitable operating conditions for each braking mode have been studied. Finally, experimental results are presented to demonstrate the validity and effectiveness of the proposed braking torque control scheme.