| 摘要 |
<p>PROBLEM TO BE SOLVED: To avoid generation of resonance of the torsional vibration in a rotary system including an electromagnetic clutch. SOLUTION: The rigidity of a hub 10 to connect an armature 8 to a drive shaft 9 is variable at the prescribed number of revolution of a compressor so as to avoid coincidence of the frequency of the n-th rotation (n=1, 2, 3,...) in the rotary system including an electromagnetic clutch 1 with the resonance frequency. The hub 10 is provided with an outer hub 12 fixed to the armature 8, an inner hub 14 fixed to the drive shaft 9, a rubber hub 15 as a first connection part to connect the outer hub 12 to the inner hub 14, and an arm 16 as a second connection part capable of attaching/detaching the outer hub 12 to/ from the inner hub 14 by the magnetic effect of the electromagnet formed by energizing an electromagnetic coil 6. The polarity of the electromagnet formed by energizing the electromagnetic coil 6 can be reversed at the prescribed number of revolution of the compressor.</p> |
