Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-04-25
1992-12-01
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310106, 310168, 318138, H02K 2906, H02K 4902, H02K 1702
Patent
active
051681900
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a reluctance-type motor which is used as a drive source replacing the conventional D.C. motor and induction motor with an inverter, and particularly can be used when a long and narrow motors, having a small diameter is needed rather than a flat-type one.
2. Description of the Related Art
Since reluctance-type motors have more magnetic poles than D.C. motors, they are difficult to make and have not ever been put to practical use.
Reluctance-type motors are well-known in the art. Reluctance-type motors provide a very low rotational speed and a large output. They have only partly been used for the arm of a robot as a direct drive unit of a load, but are not commercially available.
Reluctance-type motors are somewhat used as a small stepping motors, and wide application therefore has not been developed as yet.
It is difficult to construct a reluctance-type motor having a small diameter and a large output torque since the number of the magnetic poles is large as compared with a D.C. motor.
To explain, by taking a three-phase, full-wave motor of the reluctance type as an example, the number of magnetic poles and salient poles is large, the construction is complicated, and there are six systems of exciting coils. There are at least 12 poles and exciting coils are for a three-phase full-wave energization.
Also, the number of the salient poles of the rotor is at least 14, which is very large. Accordingly, there is a problem that it is difficult to construct a motor having a small diameter.
Further, since the number of times the magnetic energies of the magnetic energies of the magnetic and poles enter and exit during one rotation increases, there is an inconvenience that an increase of the rotational speed is difficult and iron loss increases.
Next, the second problem is that the magnetic energy stored in the exciting coils is remarkably large and a certain time is required for storage. Therefore, the rise of the energization current delayed and a reduced torque occurs.
In addition, some time is required for the magnetic energy to disappear, which causes a counter-torque. The occurrences of the reduced torque and counter-torque increase as the rotational speed rises. Consequently, there is a problem that the efficiency degrades and the rotational speed becomes extremely small. The present invention overcomes the above-mentioned problems.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a reluctance-type motor which has a small diameter, large output torque, good efficiency and high rotational speed.
The present invention is a reluctance-type motor having a plurality of armatures juxtaposed therein comprising: an outer casing provided with side boards on both sides thereof, bearings provided in the center of the side boards a rotating shaft supported by the bearings for free rotation, a magnetic rotor fixed to the rotating shaft inside the outer casing, four salient poles disposed on the output peripheral surface of the rotor with an equal width and equal spacing angle, n number of stationary armatures (n=2, 3, 4, . . .) juxtaposed within the outer casing with the outer periphery thereof being fixed, six magnetic poles having a width of 120 degrees in electrical angle which are projected from the inner peripheral surface of the stationary armatures and disposed with an equal pitch oppositely to the salient poles through a slight air gap, the magnetic poles existing in axially symmetrical positions being in phase, exciting coils of first, second and third phases mounted on the magnetic poles, a position detecting device including a plurality of position detecting elements which detect the positions of the salient poles to provide one set of position detecting signals of continuous rectangular waves of the first, second and third phases having a width of 120 degrees in electrical angle, and n-1 sets of position detecting signals of the same construction the phases of which are sequentially delayed
REFERENCES:
patent: 3679953 (1972-07-01), Bedford
patent: 3809990 (1974-05-01), Kuo
patent: 3995203 (1976-11-01), Torok
patent: 4626719 (1986-12-01), Foster
patent: 4883999 (1989-11-01), Hendershot
patent: 5059884 (1991-10-01), Shah et al.
Haszko D. R.
Kabushikigaisha Sekogiken
Stephan Steven L.
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