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| Number | Title | Issue Date |
| 7049774 | Apparatus for controlling power factor compensation in inverter control circuit and method thereof The present invention provides an apparatus for controlling power factor compensation and method thereof, in which a turn-on timing point of a power factor compensation switch is delayed by a prescribed time from a zero crossing timing point to enhance a power facto... | 05/23/2006 |
| 4378587 | Frequency converter apparatus Disclosed is a frequency converter system for altering the frequency of a-c power supplied from a distribution network to a load, the system including a pair of mechanically coupled rotating alternating current machines, the alteration of the rate and dir... | 03/29/1983 |
| 4347469 | Electronic-magnetic current isolator circuit A circuit provides an electrical output signal proportional to but electrically isolated from a current flowing in a power circuit, and more particularly, to the current supplied to the field or armature winding of a DC motor load which receives power fro... | 08/31/1982 |
| 4330740 | Energizing circuit for providing low voltage starting for submersible pump motor Low voltage starting of a three-phase submersible pump motor in a shallow well is achieved by employing a high-impedance transformer for supplying the three-phase power to the motor. Upon starting, the normally heavy current drawn by the motor results in ... | 05/18/1982 |
| 4277736 | Energy controller for conversion from a direct current source to a variable frequency load A turn off circuit for a multiphase motor is provided, comprising a D.C. powered system including a three element choke core having two outer cores with loosely coupled windings and a central core closely coupled to the outer cores to enhance pulse genera... | 07/07/1981 |
| 4258303 | Energy controller for conversion from a direct current source to a variable frequency load A turn off circuit for a multiphase motor is provided comprising a DC powered system including a three element core having a central core element and an inner and outer core element coupled thereto. A series of capacitors are connected to an outer core element... | 03/24/1981 |
| 4214196 | Energy controller for conversion from a direct current source to a variable frequency load A turn off circuit for a multiphase motor is provided comprising a DC powered system including a three element core having a control core element and an inner and outer core element coupled thereto. A series of capacitors are coupled to the central core windin... | 07/22/1980 |
| 4213077 | Speed control circuit for a universal electric motor A transformer having a secondary winding that delivers a regulating magnitude to a speed regulator circuit that approaches zero as the speed approaches the speed setting, is provided with two primary windings wound and connected so that they oppose each o... | 07/15/1980 |
