To provide a little noise and long life electromagnetic blower capable of realizing two large and small outputs by a simple and inexpensive structure.
When an electromagnetic blower is operated by a small output, the coils 33A and 33B of an electromagnet are connected in series, and an ac current is supplied from an AC power source. On the other hand, when the blower is operated by a large output, a current is carried to only one coil 33B. When the electromagnetic blower is used for sewage treatment, the electromagnetic blower is operated by a small output at the time of aeration, and when it is operated by a large output at time if reverse cleaning, the electromagnetic blower is operated generating little noise at the time of aeration and efficiency at the time of reverse cleaning is increased. In addition, to operate the electromagnetic blower by a large output, the coils 33A and 33B of the electromagnet may be connected in parallel.
NOZAWA NOBUYUKI
TAKANAKA AKIRA
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