Design of BLDCM Driving and Control System for Motorized Treadmill

Body-building equipment has become a pop industry. To satisfy the requirement of developing a new generation of motorized treadmill for a famous domestic manufacturer, a new driving and control system is developed. Brushless DC motor (BLDCM) is selected to serve as the drive and intelligent power module (IPM) is used to improve the reliability and the integration of this system. Periodic current control method is applied to reduce the average current flowing through the armature winding of the motor when the treadmill is required to start with low speed while large load is added. Piecewise PID control algorithm is applied to solve the problem of speed fluctuation when impulse load is added. An experimental prototype has been built up and experimental results indicate that the motorized treadmill with the new driving and control system has higher reliability, better speed stability, wider timing scope and lower cost than conventional one. And it is very promising for practical applications