Heat Energy Modelling of Travelling Wave Piezoceramic Ultrasonic Motor Mohd Fathuddin Mohd Sunif, Mohd Noor Firdaus Haron and Fadhlur Rahman Mohd Romlay MATEC Web Conf., 225 (2018) 01009 Published online: 05 November 2018 DOI: 10.1051/matecconf/201822501009