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Jamming protection device for moving member

  • US 6,867,563 B2
  • Filed: 04/02/2002
  • Issued: 03/15/2005
  • Est. Priority Date: 04/02/2001
  • Status: Expired due to Fees
First Claim
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1. A jamming protection device for a moving member driven by a motor (5), wherein the motor (5) is able to rotate in reverse directions and is supplied with a motor current (ID) by a power supply unit (VB), the jamming protection device 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) as a result of a jamming event; and

    a current limiting circuit (7) configured to conduct the motor current (ID) start a current limiting operation in which the motor current (ID) is decreased and increased within a predetermined region when the increment of the motor current (ID) exceeds a predetermined value.

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