| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To monitor and control variation in the rotational speed of a heat radiation fan throughout the course of operation. <P>SOLUTION: A motor rotational speed detector comprises a first input end 331 and a second input end 332 that are fixedly electrically connected with a fixed voltage source and a ground point and thus continuously input power; a third input end 333 that is electrically connected between a fan motor 31 and a system 30, and receives pulse signals transmitted from the system and controls the rotational speed of the fan motor 31; a rotational speed output module 32 that is electrically connected with a first leg support and a second leg support, and continuously outputs rotational speed signals according to the rotational speed of the motor; and a rotational speed output end 334 that is electrically connected between the rotational speed output module and the system, and outputs rotational speed signals to the system. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
