New single chip Hall sensor for three phases brushless motor control

A novel three branches vertical Hall sensor for brushless motor control is presented in this paper, The sensor gives three position signals phase shif ted by 120 degrees, corresponding to the motor driving signals. The single chip integration on a 1.7 X 1.7 mm(2) silicon chip assures homogeneous char acteristics for the three branches of the sensor. A packaged module of magn etic encoder has been realized and successfully tested on a 5 mm diameter m icromotor at a speed up to 90,000 rpm. Based on the obtained signals, a sim plified feedback driving principle for brushless motor is proposed. (C) 200 0 Elsevier Science S.A. All rights reserved.