I have developed an application that drives a sensored brushless dc motor with a pic24f, what my problem is that sometimes the motor doesnt start. i had to give the motor a start by hand... after the start everything works fine. im checking the pwm signals for corresponding HallEffect, the pwm is there but motor doesnt starts well. i did some research and assigned a high duty cycle at start(almost 90%) then decrease it slowly but no change, Does anybody know what is wrong or special with the start-up? how can i make the motor start? -- = Halil G=DCR -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist