AUTOMATIC REVERSING CIRCUIT FOR A WINDOW REGULATOR MOTOR CONTROL SYSTEM

• US 3,581,174 A
• Filed: 12/15/1969
• Issued: 05/25/1971
• Est. Priority Date: 12/15/1969
• Status: Expired due to Term

• Current Assignee: Dale F. Hammer
• Original Assignee: Dale F. Hammer
• Inventors: Hammer, Dale F.
• Application Number:
  US04/870,628
• Time in Patent Office: 526 Days
• US Class Current: 318/266
• CPC Class Codes: H02H 7/0851 for motors actuating a movable member between two end positions, e.g. detecting an end position or obstruction by overload signal
• CPC Class Codes: H02H 7/0855 avoiding response to transient overloads, e.g. during starting

Abstract

A window regulator motor control system for a drive motor operative to open and close a window includes an automatic reversing circuit incorporating an overload current relay and a reversing relay which function to reverse the motor in response to an overload current condition. The reversing relay is energized through a controlled rectifier gated conductive by a triggering circuit including a resistance-capacitance time delay network connected to the overload current relay. When the window is driven against an obstruction, the time delay network provides a momentary delay before the controlled rectifier is gated conductive and the motor is reversed.

Claims

1. A motor control system for regulating the operation of a window closure member in combination with an electrical power source;

a motor including an armature, a first field winding for rotating said armature in one direction when energized by said electrical power source, and a second field winding for rotating said armature in the opposite direction when energized by said electrical power source; and

a window regulator mechanism connected to said armature and to said window closure member for moving the window closure member to a closed position in response to rotation of said armature in said one direction and moving the window closure member to an open position in response to the rotation of said armature in said opposite direction;

wherein said motor control system comprises;

a motor power circuit including at least one electrical switch operable to a first position for connecting said armature and said first field winding across said electrical power source and operable to a second position for connecting said armature and said second field winding across said electrical power source;

a reversing relay including a relay coil and a contact assembly connected in said motor power circuit for connecting said electrical switch and said motor across said electrical power source while said relay coil is deenergized and for connecting only said armature and said second field winding across said electrical power source when said relay coil is energized;

a reversing circuit connected between said electrical power source and said relay coil including a controlled rectifier having two current carrying electrodes connected in series with said relay coil and said electrical power source, and a gate electrode for energizing said relay coil in response to the application of a trigger signal to said gate electrode;

a triggering circuit connected to said gate electrode of said controlled rectifier for applying a trigger signal to said gate electrode when the triggering circuit is energized;

an overload current relay including a relay winding and a normally open switch assembly;

means connecting said relay winding in said motor power circuit in a current sensing relationship with said first field winding so that said normally open switch assembly is closed in response to an overload current developed in said first field winding;

means connecting said normally open switch assembly and said triggering circuit across said electrical power source whereby said triggering circuit is energized when said normally open switch assembly is closed; and

a time delay network included in said triggering circuit for delaying the application of a trigger signal to said gate electrode for a predetermined time period after said triggering circuit is energized whereby said reversing circuit is insensitive to instantaneously developed high current surges through said first field winding.

2. A motor control system for regulating the operation of a window closure member in combination with an electrical power source;

a motor including an armature, a first field winding for rotating said armature in one direction when energized by said electrical power source, and a second field winding for rotating said armature in the opposite direction when energized by said electrical power source; and

a window regulator mechanism connected to said armature and to said window closure member for moving the window closure member to a closed position in response to rotation of said armatUre in said one direction and moving the window closure member to an open position in response to the rotation of said armature in said opposite direction;

wherein said motor control system comprises;

a motor power circuit including at least one electrical switch operable to a first position for connecting said armature and said first field winding across said electrical power source and operable to a second position for connecting said armature and said second field winding across said electrical power source;

a reversing relay including a relay coil and a contact assembly connected in said motor power circuit for connecting said electrical switch and said motor across said electrical power source while said relay coil is deenergized and for connecting only said armature and said second field winding across said electrical power source when said relay coil is energized;

a reversing circuit including a limit switch having a fixed contact and a movable contact operatively coupled to movement of said window closure member, a controlled rectifier having two current carrying electrodes connected in series with said fixed contact and said movable contact, and connecting said reversing relay coil across said electrical power source, the contacts of said limit switch having an open contact position in response to said window closure member being in one of the open or closed positions and a closed contact position over intermediate positions between said open or closed positions, said controlled rectifier further having a gate electrode for energizing said relay coil when said limit switch is in the closed position in response to the application of a trigger signal to said gate electrode;

a triggering circuit connected to said gate electrode of said controlled rectifier for applying a trigger signal to said gate electrode when the triggering circuit is energized;

an overload current relay including a relay winding and a normally open switch assembly;

means connecting said relay winding in said motor power circuit in a current sensing relationship with said first field winding so that said normally open switch assembly is closed in response to an overload current developed in said first field winding;

means connecting said normally open switch assembly and said triggering circuit across said electrical power source whereby said triggering circuit is energized when said normally open switch assembly is closed; and

a time delay network connected in said trigger circuit including a first resistor, a second resistor connected in series with said first resistor and a capacitor connected across said second resistor, said time delay network having a predetermined time constant for delaying the application of a trigger signal to said gate electrode for a predetermined time period after the triggering circuit is energized whereby said reversing circuit is insensitive to instantaneously developed high current surges occurring in said first field winding.