| 摘要 |
<p>An electromagnetic actuator (10) has a sensor for sensing an amount of applied force. The actuator maintains an adjustable force by adjusting a current in its coils (18, 20). The actuator includes an armature (16) and a stator (12). The stator has a U-shaped back iron (22), which has a first end portion (25) with a first coil (18) and which has a second end portion (27) with a second coil (20). The coils form a magnetic flux path from the armature through the back iron and back to the armature. There is a flux density between the armature and each polar enlargement (25, 27) of the back iron. A first sensor unit (24) is mounted on the first pole face (25), and a second sensor (26) unit is mounted on the second pole face (27) of the back iron (22), for sensing the flux densities. The first sensor unit (24) includes a first Hall generator subassembly (30) and the second sensor unit (26) includes a second Hall generator subassembly (32). The output voltage is directly proportional to the force, which is proportional to the square of the flux density.</p> |
