| 摘要 |
PURPOSE: To improve vibration insulation by providing electromagnets each having at least one coil capable of receiving an a.c. current and at least one coil capable of receiving a d.c. current, and passing either an a.c. or a d.c. current in opposite direction in the axially opposing electromagnets. CONSTITUTION: The opposing electromagnets 6, 7 are formed as lifting magnets and disposed in grooves 8, 9 opening to a compensating wall 3 of coil support 10, 11 made of a soft magnetic material. The electromagnetic coils 6, 7 have one d.c. coil 12.1, 12.2 and one a.c. coil 13.1, 13.2, respectively, and both d.c. coils 12.1, 12.2 and both a.c. coils 13.1, 13.2 are respectively lumped into one series circuit. Current traverses the d.c. coils 12.1, 12.2 in the same direction, while it is passed in the opposite direction in the a.c. coils 13.1, 13.2. Supplying a.c. current to the a.c. coils 13.1, 13.2 causes reciprocating a.c. magnetic forces act on the compensation wall 3, synchronizing the direction of movement of the compensation wall 3 and the direction of vibration to be suppressed, to effect prevention of vibrations. |
