Electricity: single generator systems – Generator control – Combined permanent magnet and wound field structure
Reexamination Certificate
1999-05-07
2001-05-29
Ponomarenko, Nicholas (Department: 2834)
Electricity: single generator systems
Generator control
Combined permanent magnet and wound field structure
C322S044000
Reexamination Certificate
active
06239583
ABSTRACT:
TECHNICAL FIELD
This invention relates generally to electrical power generating systems, and more particularly, to a regulation system for a permanent magnet generator.
BACKGROUND ART
Electric generators, such as permanent magnet generators, are well known types of electrical power generating systems for supplying power to a wide variety of systems. A generator typically includes either a rotor mounted on a rotating shaft and disposed concentrically relative to a stationary stator or a stationary rotor positioned concentrically positioned within a rotating stator. An external energy source, such as a motor, an engine, or a turbine, commonly drives the rotating element. Both the stator and the rotor have a series of poles. The stator or the rotor generates a magnetic field which interacts with the windings on the poles of the other structure. As the magnetic field intercepts the windings, an electrical voltage is generated which is provided to a load. This voltage may also be applied to a bridge rectifier, sometimes regulated, and then provided as an output.
A permanent magnet generator uses permanent magnets to generate the required magnetic field. Permanent magnet generators are typically much lighter and smaller than traditional wound field generators. However, one disadvantage associated with a permanent magnet generator is that it is difficult to control or regulate the power supplied by the permanent magnet generator. For instance, the voltage supplied by the permanent magnet generator can vary significantly according to the speed of the rotor. Changes in the speed of the rotor can occur due to engine speed variations or changes in the load characteristics. Additionally, the voltage of a permanent magnet generator varies inversely with the current delivered. Stated another way, as the current increases the voltage decreases. Variations in the voltage are not acceptable for conventional loads and the voltage must be controlled or regulated.
Accordingly, the present invention is directed to overcome one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention a regulation system for a permanent magnet generator for generating electrical power and for supplying the electrical power to a load is disclosed in which the regulation system comprises a switching circuit connected between the permanent magnet generator and the load, the switching circuit being capable of regulating the electrical power being supplied to the load and a control circuit connected to the switching circuit, the control circuit for determining the amount of electrical power being supplied by the permanent magnet generator and for controlling operation of the switching circuit to regulate the electrical power being supplied to the load.
In another aspect of the present invention a regulation system for a permanent magnet generator is disclosed in which the permanent magnet generator has a pair of windings with each winding having three phases, the windings being displaced from each other by a number of electrical degrees, the permanent magnet generator for generating electrical power and for supplying the electrical power to a load, the regulation system comprises a switching circuit connected between each corresponding phases of each winding, the switching circuit for regulating the electrical power being supplied to the load and a control circuit connected to each of the switching circuits, the control circuit for determining the amount of electrical power being supplied by the permanent magnet generator and for controlling the operation of each of the switching circuits to regulate the electrical power being supplied to the load.
In a further aspect of the present invention a regulation system for a permanent magnet generator for generating voltage and for supplying the voltage to a load comprises a switching circuit connected between the permanent magnet generator and the load, the switching circuit for imposing a lagging power factor on the permanent magnet generator for regulating the voltage being supplied to the load and a control circuit connected to the switching circuit, the control circuit for determining the voltage being supplied by the permanent magnet generator and for controlling operation of the switching circuit to regulate the voltage being supplied to the load.
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Lindbery John R.
Mehrayin Kourosh
Reichard Jeffrey A.
Haverstock Garrett & Roberts
McPherson III W. Bryan
Ponomarenko Nicholas
Solar Turbines Incorporated
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