| 摘要 |
The invention relates to an oscillating piston drive, especially for on oscillating piston vacuum pump. Said oscillating piston drive comprises a housing (2), with a cylinder (3) that is configured within the housing and with a piston (4) that reciprocates within the cylinder. The drive is further provided with an electromagnetic drive for the piston (4) which comprises an electromagnet (11) at the stator end and at least one permanent magnet (1, 19) at the piston end. The aim of the invention is to prolong the service life of such an oscillating piston drive. To this end, permanent magnets (15, 16) are also provided at the stator end and the permanent magnets (18, 19) of the piston (4) and the permanent magnets (15, 16) of the stator are configured and arranged in such a manner that the piston (4) has a substantially central axial position in a non-operative state. |
