Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-03-31
1998-10-27
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Rotary
310261, 310 68R, 310162, H02K 1900, H02K 1100, H02P 705
Patent
active
058281541
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a reluctance motor used as a drive source for the axes of rotation of machine tools, compressors, electric vehicles, etc., and more particularly, to a reluctance motor with increased torque.
BACKGROUND ART
In a reluctance motor, magnetic poles are formed by winding armature coils in slots that are arranged in the inner peripheral surface of a stator armature, while salient poles are arranged on the outer peripheral surface of a rotor. The magnetic poles are excited with the salient poles and the inner peripheral surface of the stator armature facing one another across narrow gaps, with the result that leakage fluxes are generated between the magnetic poles and the salient poles, thereby causing a torque to be developed.
In order to increase this torque, therefore, it may be necessary (a) to increase the leakage fluxes to be generated between the magnetic poles and the salient poles or (b) to reduce as far as possible the air gap between the salient poles and the inner peripheral surface of the stator armature. In the case (a), the capacity of the armature coils wound in the slots of the stator armature must be increased. However, as the increase in capacity of the armature coils results in increase in size of the reluctance motor, the increase in torque based on the increase in leakage fluxes has its limit. In the case (b), on the other hand, as not only the machining accuracy must be improved but also the magnetic poles and the salient poles may come into contact with one another even with a small wear of a bearing for holding the rotor, increasing the torque by reducing the air gap has also its limit.
DISCLOSURE OF THE INVENTION
The object of the present invention is to provide a reluctance motor capable of increasing its torque by increasing leakage fluxes between magnetic poles formed on a stator armature and salient poles formed on a rotor, without increasing the size of a motor by increasing the capacity of armature coils which form magnetic poles, or without improving machining accuracy in order to minimize the size of gaps between the salient poles and the inner peripheral surface of the stator armature.
In order to achieve the above object, a reluctance motor according to the present invention comprises: a magnetic stator armature formed with 8n units (n is an integer of 1 or more) of slots arranged in the inner peripheral surface thereof at regular angular intervals of 90 degrees in terms of electrical angles; 8n units of magnetic poles formed by winding armature coils individually between the adjacent,slots in said magnetic stator armature; a magnetic rotor formed with 2n units of salient poles arranged on the outer peripheral surface thereof and having a width ranging from an electrical angle of 180 degrees to 270 degrees and at intervals ranging from electrical angles of 90 degrees to 180 degrees; means for holding said magnetic rotor relatively to said stator armature so that the respective outer peripheral surfaces of the 2n units of salient poles of said magnetic rotor and the inner peripheral surface of said stator armature confront one another across narrow air gaps; rotational position detecting means for detecting the respective rotational positions of the salient poles of the rotor with respect to each slot of said stator armature; a power-supply signal generator for generating 4n sets of phase power-supply signals based on rotational position signals from said rotational position. detecting means so that power-supply signals in one phase overlap power-supply signals in another phase by electrical angles of 90.degree.; 4n units of phase exciting coils formed by connecting the armature coils of each two diametrically opposite salient poles, out of said 8n units of salient poles, in series or parallel with each other; and a power-supply control circuit designed so that semiconductor switching elements are connected individually in series with said 4n units of phase exciting coils, and that the exciting coils for each. phase are ener
REFERENCES:
patent: 3956678 (1976-05-01), Byrne et al.
patent: 4143308 (1979-03-01), Deplante et al.
patent: 4763056 (1988-08-01), Byrne et al.
patent: 5012172 (1991-04-01), Sember
patent: 5239217 (1993-08-01), Horst
Dougherty Thomas M.
Kabushikigaisha Sekogiken
Nguyen Tran N.
LandOfFree
Reluctance motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reluctance motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reluctance motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1615704