We introduce a design and implementation of BLDC
motor controller for an electric power wheelchair The
control architecture consists of two layers of feedback
control, namely the wheelchair posture control and the
wheel veloci(y control. In the higher level of control
archilecture, the posture controller works as a reference
velociiy generator for two wheels. We realize the joystick
Interface and the posture controller in an &bits
microcontroller. It is on the lower layer that the velocity
controller performs four quadrant operations. For the
driving system. a DSP-based BLDC motor controller with
three-phase inverter module is especially designed using
on& three Hall-effect sensors and a single dc-link current
sensor. The functions of this motor controller include
wheel velociy control and torque control. The
performance of the control system is experimentally
verified.