| 摘要 |
PROBLEM TO BE SOLVED: To suppress loss of a drive circuit of a fan motor to be below a fixed value.SOLUTION: The fan motor controller includes: a voltage sensor 148 for detecting a voltage applied to a fan motor M; a switching section 130 for selectively connecting each of coils Lu, Lv, Lw of the fan motor M with a rectification circuit 110; and a switching control section 150 for lowering a duty ratio of a drive pulse given to the switching section 130 when a voltage detected by the voltage sensor 148 exceeds a threshold value. |
