| 摘要 |
PROBLEM TO BE SOLVED: To provide an air cleaner, in which the characteristics of a motor can be inspected easily at a low cost without performing plant and equipment investment in a factory before shipment. SOLUTION: The air cleaner 43 is constituted of a fan for taking in air and a motor 14, a filter for air purification and a housing for storing them. A detection means 40 for number of revolutions, in which the signal of the number of revolutions of the motor 14 is outputted to perform feedback control of the same, is mounted in the motor 14. Number of revolutions per unit time of a rotator such as the fan is measured by a measuring circuit 45 by taking in the signal of the number of revolutions outputted from the detection means 40 for number of revolutions of the motor 14 and the measured number of revolutions is indicated in an indication part 50. |
