Jamming protection device for moving member
AssigneeYazaki Corporation
InventorShunzou Ohshima
Life of this patent
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Abstract
When abnormal current due to jamming is detected through motor current (ID), the motor current (ID) performs an operation in which an ON/OFF operation and a continuous ON operation are repeated, so that increment of the motor current (ID) is restrained. At this time, determination of jamming is performed based on the ON/OFF operation and the continuous ON operation. When the jamming is determined, the motor current (ID) is stopped, and the motor is reversed.
Claims27
A jamming protection device for a moving member driven by a motor (5) being able to rotate in the reverse direction supplied with a motor current (ID) by a power supply unit (VB), comprising:
- a current detection circuit (2) being connectable to one of a plus terminal and a minus terminal of the power supply unit (VB), configured to conduct the motor current (ID) and to detect an increment of the motor current (ID);
- and
- a current limiting circuit (7) configured to conduct the motor current (ID) and to decrease and increase the motor current (ID) within a predetermined region when the increment of the motor current (ID) exceeds a predetermined value.
Dependencies are inferred from the claim text.