Patents Assigned to ETI Systems, Inc.
  • Patent number: 5712548
    Abstract: A motor actuator for preventing a motor from drawing excess current for longer than a predetermined time delay period including dynamic brakes for simultaneously braking motor rotation when motor operation is terminated for any reason. Source voltage supplies an input to a voltage regulator which in turn supplies a regulated voltage to the motor. The actuator includes a comparator circuit that has one input connected to motor supplied regulated voltage and a second input connected to the source voltage with the voltage level from source voltage adjusted to a level that is equal to the regulated motor voltage level under normal motor operational loads. When the motor draws excessive current the voltages on the comparator inputs become unequal which causes the comparator to have an output voltage. An RC circuit from the comparator output to ground potential delays the comparator output voltage for a predetermined time.
    Type: Grant
    Filed: January 16, 1997
    Date of Patent: January 27, 1998
    Assignee: ETI Systems, Inc.
    Inventors: Bill Tice, Brian Matthew Haskell