Electricity: motive power systems – Synchronous motor systems
Patent
1998-09-22
2000-04-18
Masih, Karen
Electricity: motive power systems
Synchronous motor systems
318139, 318145, 318151, 180 651, H02P 146
Patent
active
060519517
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a generator-motor for internal combustion engines, which operates not only as a generator for converting energy of rotation of an internal combustion engine into electric energy, but also as a motor for generating such a torque as to assist or suppress the torque generated by the internal combustion engine.
2. Description of the Related Art
A typical generator for internal combustion engines mounted on vehicles or ships includes an alternator (ACG ) with its rotating shaft mechanically coupled to a crank shaft of an internal combustion engine (generally, through an alternator belt); a rectifier for converting AC power into DC power, the AC power generated by the alternator according to the rotating speed of the internal combustion engine; and a regulator for controlling the voltage level of the DC power according to the voltage across a battery. FIG. 2 is a schematic diagram showing a structure of a conventional alternator 50, in which a DC field coil 53 is wound around a rotor 52 integrally formed with the rotating shaft and a three-phase coil 55 is wound around a stator 54. Whenever the DC field coil 53 is excited by supplying direct current from the battery (not shown), the rotor 52 is rotated to create an alternating magnetic field. Consequently, the three-phase coil 55 of the stator 54 generates AC power with a frequency corresponding to the rotation speed of the rotor 52. In some cases, the rotor 52 may be provided with a permanent magnet instead of the DC field coil 53.
With such an internal combustion engine for vehicles or the like, since the rotor 52 of the alternator 50 is mechanically coupled to the crankshaft of the internal combustion engine even when the battery is fully charged and power generation is no longer necessary, the rotor 52 is rotated constantly to cause rotation loss due to belt driving torque or cooling fan resistance.
SUMMARY OF THE INVENTION
The present invention has been made by taking into account that such a conventional alternator is a generator with a construction of synchronous motor type, and a object thereof is to provide a generator-motor for internal combustion engines, which operates not only as a generator but also as a motor without any distinct change in structure of the conventional alternator.
The present invention is characterized in that the generator-motor for internal combustion engines comprising an alternator which includes a stator having multi-phase windings and a rotor having direct-current magnetic field generation means, which rotor is mechanically coupled to a rotating shaft of an internal combustion engine; output control means converting an alternating current generated in the multi-phase windings into direct current when said alternator is in the generator mode, which alternating current is induced by the rotation of said rotor resulting from the rotation of the internal combustion engine; rotating magnetic field generation means generating alternating current to be supplied to the multi-phase windings for generating a rotating magnetic field which causes said alternator to operate in the motor mode; switching means for selectively connecting the multi-phase windings of said stator to either said output control means or said rotating magnetic field generation means.
The rotating magnetic field generation means of the present invention is actuated according to the operating condition of the internal combustion engine in the following manners.
(1) The rotating magnetic field generation means generates a rotating magnetic field which causes the alternator (in the motor mode) to produce a torque assisting or suppressing the rotation of the internal combustion engine so that fluctuations in rotation of the internal combustion engine is absorbed and a deviation of the engine rotation with respect to a target value decreases at the time of idling or the like.
(2) The rotating magnetic field generation means generates in the stator such a rotating magnetic field as to ca
REFERENCES:
patent: 5415139 (1995-05-01), Aoto et al.
patent: 5497741 (1996-03-01), Tashiro et al.
patent: 5789881 (1998-08-01), Egami et al.
Arai Hideaki
Fujita Takuya
Kubo Kazuyuki
Honda Giken Kogyo Kabushiki Kaisha
Masih Karen
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