Patents Assigned to Lima Electric Co., Inc.
  • Patent number: 4594632
    Abstract: The rotor of a brushless synchronous machine, such as an alternator exciter machine, includes a field winding and a rectifier for applying full wave rectified power to the field winding. To protect the rectifier from excessive inverse voltages when such voltages are induced in the field winding, for example during motor starting, alternator paralleling, etc., the present invention employs an excessive voltage sensor and a triggerable bypass circuit for bypassing such excessive inverse voltage from the rectifier when the sensor senses such excessive inverse voltage. The sensor preferably includes a solid state relay capable of assuming either of two output conditions, depending on the magnitude, and with a prescribed input circuit, the polarity, as well, of a voltage induced in the field winding.
    Type: Grant
    Filed: April 20, 1984
    Date of Patent: June 10, 1986
    Assignee: Lima Electric Co., Inc.
    Inventor: Lewis E. Unnewehr
  • Patent number: 4496897
    Abstract: An electric generating device of the self-excited, self-regulated, brushless, synchronous type includes an alternator-exciter for producing an electrical output and an adjusting means for adjusting or setting the output voltage of the alternator-exciter substantially independently of the winding arrangement thereof to control the no-load or light load voltage of the electrical output. A deactivating device deactivates the adjusting control when maximum field current is demanded by a load.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: January 29, 1985
    Assignee: Lima Electric Co., Inc.
    Inventors: Lewis E. Unnewehr, Robert B. Walker, Andrew F. Szippl
  • Patent number: 4408152
    Abstract: A substantially constant frequency self-regulated generator produces in one embodiment 120 volts or the like single phase output or in another embodiment 120 or 240 volts or the like single phase output. The generator employs an exciter stator and a stationary rectifier assembly with the former being a six pole exciter stator alternately wound with three shunt poles and three series poles with two separate windings on each series pole. The three shunt poles of the exciter stator are connected in series making, in effect, one shunt winding. The series circuit consists of two separate windings on each series pole, which are respectively parallel connected and wound on all three series poles. Each series pole then has two separate isolated coils. With the exciter stator there is employed a stationary diode assembly utilizing three diodes as rectifiers for the shunt and isolated series windings.
    Type: Grant
    Filed: June 22, 1981
    Date of Patent: October 4, 1983
    Assignee: The Lima Electric Co., Inc.
    Inventors: Andrew F. Szippl, Robert B. Walker