| 摘要 |
PROBLEM TO BE SOLVED: To stably operate a pump for jet generating bathtub by accurately recognizing the position of the rotor of a motor by avoiding noise by outputting a driving pulse of a prescribed pattern corresponding to a positional input from a comparator to a switching element by using a microcomputer. SOLUTION: The microcomputer 1 of a pump drive controller 11 is set in such a way that, after the microcomputer 1 outputs a driving pulse to a switching element 3 based on a positional input from a comparator 4, the microcomputer 1 maintains the output without performing positional judgment on the rotor 32 of a motor for a fixed period of time and, after the fixed period of time has elapsed, restarts the positional judgment and outputs a driving pulse of a prescribed pattern corresponding to the positional input from the comparator 4. Therefore, more accurate positional judgment can be performed on the rotor 32 and a pump 31 can be operated stably by avoiding the influence of switching noise which is generated when the switching element 3 is turned on/off. |
