| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce noises of a cooling device and reduce costs. <P>SOLUTION: A cooling device includes: a fan motor 200 which has hall elements 201 each sensing magnetic flux density of a magnet installed in a rotor 202 and outputting voltage corresponding to the sensed magnetic flux density of the magnet; a motor drive circuit 304 driving the fan motor 200; and a CPU 302 performing control so as to enable the motor drive circuit 304 to drive the fan motor 200 at rotating speed corresponding to an atmospheric temperature, based on a result obtained by comparing an output voltage value of the hall element 201 with an output voltage of the hall element 201 at a predetermined atmospheric temperature. <P>COPYRIGHT: (C)2012,JPO&INPIT |
