| Electrical Communication is a free textbook on the basics of communication technology. See the editorial for more information.... |
|
Home  Electroacoustic Devices Magnetic-Armature Motor Element |
|||
 Search the VIAS Library | Index
|
  |
||
Magnetic-Armature Motor ElementFrom the general nature of the definition previously given, it follows that many magnetic-armature motor elements are possible. One type that was used early in radio is shown in Fig. 18. The armature is of soft iron and is held at the center so that it can move by flexing the support that holds it. The coil carrying the signal currents does not move.
Suppose that at a given instant the alternating signal current has the direction indicated. The soft-iron armature will then have the polarity shown, and the top of the armature will move to the right and the bottom to the left. On the next half cycle the current and the motion will be reversed. Because of this mode of operation, the device is often called a balanced-armature motor element. In an early radio loudspeaker known as the cone loudspeaker the motion of the armature was transmitted to a large double cone, only a portion of the front cone being shown in Fig. 18.
|
|||
| Home Electroacoustic Devices Magnetic-Armature Motor Element |
|
||
Last Update: 2011-05-30