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| Number | Title | Issue Date |
| 7098550 | Method for controlling a wind energy plant The present invention concerns a method of controlling a wind power installation and a wind power installation in particular for carrying out the method. Wind power installations have been generally known for a long time and in recent times are increasingly u... | 08/29/2006 |
| 7045983 | System for controlling motor speed by altering magnetic field of the motor The present invention provides a system for controlling the speed of a motor by altering the magnetic field of the motor. The system includes field modification module, and a motor having field windings and a rotor. The field windings are configured to receive a dri... | 05/16/2006 |
| 7023121 | Brushless rotary electric machine having tandem rotary cores A brushless rotary electric machine includes a stator having an annular armature core with first radial teeth at the outer periphery thereof and second radial teeth at the inner periphery thereof and an armature winding wound between the teeth, a rotor having a pair... | 04/04/2006 |
| 7023150 | Drive device A hybrid drive apparatus includes an engine, a first electric motor for generating electric power by using at least a portion of its output and for controlling the speed of the engine and a control unit for controlling the engine and the first electric motor. The co... | 04/04/2006 |
| 6933701 | Control apparatus for synchronous motor In a control apparatus for a synchronous motor, a coordinate converter converts a detected current into a current on rotational biaxial coordinates (d-q axis). A current controller outputs a voltage command on the coordinates so that the current follows a current co... | 08/23/2005 |
| 6628101 | Electronic shorting of wound rotor windings A method for shorting rotor windings in a wound rotor induction machine is disclosed. The method includes the steps of monitoring rotor current for a frequency indicative of a desired steady-state operating condition and electronically shorting the rotor ... | 09/30/2003 |
| 5598079 | A.C. induction devices having tuned compound windings The present invention is applicable to any a.c. electromagnetic reduction device which is used to change voltage or current levels or to transfer energy between mechanical and electrical systems and includes, for each phase, a combined pair of windings wh... | 01/28/1997 |
| 4928051 | Electric motor An electric motor has a rotor and a stator each of which is provided with a polyphase winding. The rotor and stator have the same number of poles but the number of phases in the winding of the rotor differs from that in the winding of the stator. The moto... | 05/22/1990 |
| 4652807 | Starting method for induction motors An induction motor starting method comprises the steps of supplying a predetermined low-frequency current to the primary winding of an induction motor through a first cycloconverter having its input side connected to a commercial-frequency power source an... | 03/24/1987 |
| 4149114 | Induction motors having squirrel cage rotors analogous to commutator motors This invention presents several meters characterized by a novel stator structure having distinct and separated energizing and exciting windings and provided with squirrel cage rotors of conventional design which are energized by induction, replacing rotor... | 04/10/1979 |
| 4001666 | Load peak shaver power regulating system A power regulating system controlling a flywheel-type load peak shaver is described wherein average power to a cyclic load is continuously subtracted from instantaneous load power to provide a command signal proportional to the required load peak shaver p... | 01/04/1977 |
