Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1984-04-16
1985-01-29
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Rotary
310211, H02K 7102
Patent
active
044968647
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION
This application is a national phase application corresponding to PCT R081/00004 filed Aug. 4, 1981 and based in turn upon a Romanian application 102,742 filed Dec. 2, 1980 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a brake asynchronous electrical motor, with double drive and short-circuit rotor, where its own magneticfield, simultaneously generates both the rotational torque on the rotor, and the brake deblocking electromagnetic force.
BACKGROUND OF THE INVENTION
A motor is known where, to use part of the magnetic field created by the stator excitation winding, to generate the axial attraction force on the brake deblocking movable armature, the stack of stator sheet proper is elongated by a supplementary stack of stator sheets, with the same number of slots as the stack of stator sheets proper, and the teeth of the slots are elongated towards the central area, up to the level of the rotor short-circuiting ring inner diameter, and are separated from the corresponding slots. This shape of the supplementary stack of stator sheets has the disadvantage of encumbering the manufacturing of the stator and impedes attempts to automatically wire it.
SUMMARY OF THE INVENTION
The present invention removes this disadvantage by the use of a normal stack of stator sheets, extended by a supplementary stack of stator sheets, having the same cross-geometry as the normal stack of stator sheets, the excitation winding being common to both, a normal stack of rotor sheets having the cage rods, extended in the zone within the supplementary stack of stator sheets and separated by stacks of teeth, between which appear slots with the same shape as those in the area of the normal stack of rotor sheets, but open towards the inside, and short-circuited though these openings by the short-circuiting ring, located in this area, the stacks of teeth being magnetically separated from the area of the normal stack of rotor sheets by means of a spacer. In front of the stacks of teeth we provide the brake deblocking movable armature that may move axially on the shaft, the shaft constituting, in the corresponding area, a part of the magnetic circuit for closing the magnetic flux created by the current that flows through the short-circuiting ring. The magnetic flux is summed in the air gap between the brake deblocking movable armature and the stacks of teeth, with the magnetic flux created by the excitation winding in the supplementary stack of stator sheets. The summed magnetic flux generates the axial attraction electromagnetic force that acts upon the brake deblocking movable armature. The brake deblocking movable armature active zone, in front of the stacks of teeth, may be made by rolling out of electrotechnical plate, to enable the penetration of the magnetic field and to decrease losses by eddy currents in transitory regime, or steel. The brake deblocking movable armature is fixed on the shaft either with a sliding fit, or by a corresponding ball or pin bearing, that allows axial displacement, the axial attraction electromagnetic force acting on the brake deblocking movable armature passes to one of the friction parts, that plays the part of the ventilator as well, by means of a screw, a rod located in a central hole of the shaft, adjusting nuts and a notched sleeve.
BRIEF DESCRIPTION OF THE DRAWING
In the drawing:
FIG. 1 is a longitudinal section of the motor assembly; and
FIG. 2 is a cross section of the rotor area under the supplementary stack of stator sheets.
SPECIFIC DESCRIPTION
The motor, according to the invention requires a magnetic field to generate both the rotating torque on the rotor, and the electric magnetic force for brake deblocking. In order to achieve this, the motor has, besides the normal stack of stator sheets, a supplementary stack of stator sheets, the excitation winding being common to both. The stack of stator sheets has its cage rods elongated into the area within the supplementary stack of stator sheets, separated by
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patent: 3683217 (1972-08-01), Hgalakov et al.
patent: 4096404 (1978-06-01), Sukhanov et al.
patent: 4129797 (1978-12-01), Lindner
Apetrei Constantin
Elek Demeter
Nitigus Victor
Radulescu Marian
Sachelaire Toma
Duggan Donovan F.
Research Institute for the Electrotechnical Industry--ICPE
Ross Karl F.
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