| 摘要 |
<p>PROBLEM TO BE SOLVED: To dispense with a reduction gear and at the same time, enable an impeller to be commonly used by a plurality of different types of devices used in plural areas where different power supply frequencies are adopted and further, achieve the saving of cost and the enhancement of capability. SOLUTION: In an area where the power supply frequency is 50 Hz, a first motor 2 with the number of poles of 10 is mounted and in an area where the power supply frequency is 60 Hz, a second motor with the number of poles of 12 is mounted. The first 2 and the second motor are mutually of the identical shape and the identical size. A motor casing 1 is equipped with a motor mounting part 81 for mounting each of the motors 2. On the impeller 8, shaft connection parts 82 for connecting the shaft 13 of each of the motors respectively are formed. A first seration device with the first motor 2 mounted and a second aeration device with the second motor mounted use commonly available parts other than the motors 2.</p> |
