Motor driving system

A motor driving system for controlling movement of a follower member, said motor driving system comprising:

• a motor for providing a working mechanical energy E required to control movement of said follower member;
• a transmission member coupled to said motor and said follower member and driven by said motor to transmit said follower member to move;
• a position-detecting light emitter and a return light emitter for generating a first light beam and a second light beam, respectively;
• a position-detecting light receiver and a return light receiver for receiving said first light beam and said second light beam, respectively;
• and
• a positioning-status sensing element disposed on said transmission member and including a front end, a rear end and a plurality of notches or openings between said first end and said rear end, said positioning-status sensing element being moved between said position-detecting light emitter and said position-detecting light receiver such that a light beam emitted from said position-detecting light emitter is successively penetrated through said notches or openings to be received by said position-detecting light receiver, wherein said working mechanical energy E provided by said motor is decreased to a first mechanical energy E1 so as to reduce the speed of said transmission member when the notch or opening nearest to said front end of said positioning-status sensing element enters the region between said position-detecting light emitter and said position-detecting light receiver, and said working mechanical energy E provided by said motor is decreased to a final mechanical energy En when the notch or opening nearest to said rear end of said positioning-status sensing element enters the region between said position-detecting light emitter and said position-detecting light receiver, where said first mechanical energy E1 is greater than said final mechanical energy En.