| 摘要 |
PCT No. PCT/SE96/00514 Sec. 371 Date Mar. 5, 1998 Sec. 102(e) Date Mar. 5, 1998 PCT Filed Apr. 19, 1996 PCT Pub. No. WO96/36088 PCT Pub. Date Nov. 14, 1996An antenna device used in a car radar system for emitting and/or receiving electromagnetic radiation, comprises a rotatable reflector; a feeder fixed relative to the antenna device and interacting with the reflector; a motor for driving the reflector; and a tachometer for monitoring the rotation of the reflector and for controlling the drive motor. The drive motor and the tachometer are constituted by flag motors, each having a rotor with flat coils and a stator including permanent magnets, the rotor being rotatable in a magnetic field created by permanent magnets and having the coil ends directed towards the permanent magnets, the rotors of the flag motors being rigidly, mechanically connected to each other.
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