Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-01-16
1999-03-09
LaBalle, Clayton
Electrical generator or motor structure
Dynamoelectric
Rotary
310 905, H02K 1906, H02K 709
Patent
active
058805494
DESCRIPTION:
BRIEF SUMMARY
INDUSTRIAL FIELD
This invention relates to a switched reluctance rotator. More particularly, it relates to a switched reluctance rotator capable of rotating a rotor at a high speed without generating electromagnetic vibration at the rotating shaft of the rotor.
PRIOR ART
A switched reluctance rotator includes a switched reluctance motor and a switched reluctance generator.
A conventional switched reluctance motor is shown in FIG. 32.
As shown in FIG. 32, switched reluctance motor 50 comprises a four pole rotor 51 wherein each of the poles protrudes crosswisely around the rotating shaft and a six pole stator 52 arranged around the rotor 51, each of the protruding pole of said stator 52 having a concentrated winding 53 which is concentratedly wound. The current passed through winding 53 (referred to as a winding current) is unidirectional and includes a distorted wave current and direct current component. In FIG. 32, 54 indicates an invertor and 55 indicates a direct current source.
In the switched reluctance motor 50 having the above construction, the protruding poles of stator 52 attract the protruding poles on the outer peripheral surface of rotor 51 to generate a torque and as a result, rotor 51 rotates. In the switched reluctance motor 50 having the above construction, if the rotor 51 is eccentric or machined incorrectly a great force in the radial direction is generated, which generates an electromagnetic vibration. Furthermore, when the length of gap between the rotor 51 and the stator 52 is extremely reduced for improving the efficiency of said rotator, another problem occurs that more electromagnetic vibration and more noise are generated compared with a usual motor.
The same problems are also seen in switched reluctance generators.
An object of this invention is to solve the above problems. Another object of this invention is to provide a switched reluctance rotator according to which even if deviation of the rotating shaft occurs when the rotor is rotating, the deviation is automatically corrected to prevent from the generation of electromagnetic vibration and simultaneously the rotor is supported in a levitating manner by a magnetic force, and thus, the rotating shaft rotates smoothly.
DISCLOSURE OF INVENTION
This invention relates to a switched reluctance rotator, characterized by having a rotor provided with a plurality of protruding poles, a stator arranged around the rotor and provided with protruding poles, windings provided at the respective protruding poles of the stator, and a current controlling part which controls the current passed through the windings so as to generate a torque and a radial force at the rotor.
In the above switched reluctance rotator, the windings are independently on the respective protruding poles so that said windings can be independently energized, and said current controlling device is formed so that the current passed through the respective windings can be independently controlled so as to generate a radial force.
In the above switched reluctance rotator, the windings comprise a plurality of groups of windings through which current can be independently passed and said current controlling device is formed so that the current passed through said winding groups can be independently controlled so as to generate a radial force.
Another invention relates to a switched reluctance rotator having a rotor provided with a plurality of protruding poles, a stator arranged around the rotor and provided with protruding poles, and windings for generating a torque provided at the respective protruding poles of the stator and generating a rotating torque at the rotor, characterized in that the windings for generating radial force which give a radial force to the rotor are provided at the respective protruding poles of the rotor so as to magnetically levitate the rotor.
This switched reluctance rotator desirably has a deviation detector which detects the deviation of the rotor in the radial direction and a current controlling part which inputs therein the detection signal w
REFERENCES:
patent: 2777105 (1957-01-01), Larsen
patent: 3988658 (1976-10-01), Meinke et al.
patent: 4683391 (1987-07-01), Higuchi
patent: 4792710 (1988-12-01), Williamson
patent: 4841204 (1989-06-01), Studer
patent: 4947067 (1990-08-01), Habermann et al.
patent: 5424595 (1995-06-01), Preston et al.
Chikara Michioka et al, "A Decoupling Control Method of Reluctance-Type Bearingless Motors Considering Magnetic Saturation", IEEE Transactions on Industry Applications, vol. 32 No. 5, Sep./Oct. 1996, pp. 1204-1210.
Akira Chiba et al, "A Machine Parameter Measurement of Switched Reluctance Machines with Egg-Shaped Diagram", IEEE Transaction on Industry Applicatins, pp. 728-735.
Chiba Akira
Fukao Tadashi
Michioka Chikara
Chiba Akira
Ebara Corporation
Fukao Tadashi
LaBalle Clayton
Michioka Chikara
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