| 摘要 |
<p>PURPOSE:To control the torque transmitted by an electromagnetic torque transmission device precisely and efficiently by pulse width modulation of operating power. CONSTITUTION:First operating pulse is applied to a coil 11 to let an iron core 10 have suction force, and transmission torque is increased to a value corresponding to an expected standard light load to start a driven shaft 3. At this time, if the load is further lighter than the expected load, a duty factor of operating pulse is adjusted to weaken the suction force of the iron core 10, so that transmission torque is gradually increased. On the contrary, if the load is heavier, the suction force of the iron core 10 is increased. A pulse width modulation circuit 18 for adjusting a duty factor of operating pulse is controlled by a control circuit 19.</p> |
