Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-12-14
2001-02-20
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S089000, C310S091000, C310S154090, C310S261100
Reexamination Certificate
active
06191516
ABSTRACT:
PRIOR ART
The invention is based on an electric motor. An electric motor has already been disclosed (DE 26 37 705 A1) in which the magnetic yoke is comprised of two half shells which define an air gap between themselves, approximately in the middle of the permanent magnet segments. The armature transverse field, which reduces the efficiency of the electric motor, is weakened by air gaps of this kind.
ADVANTAGES OF THE INVENTION
The electric motor according to the invention, has the advantage over the prior art that in addition to a reduction of the armature transverse field to improve the efficiency of the electric motor, the material quantity for the magnetic yoke is reduced, which reduces the weight of the electric motor and reduces the material costs. This advantage of the electric motor according to the invention is based on the knowledge that in order to conduct magnetic field lines in the vicinity of a symmetry plane of the permanent magnet segments extending through the longitudinal axis of the motor, a significantly smaller flux cross-section is required for the magnetic field lines than between the permanent magnet segments viewed in the circumference direction.
It is particularly advantageous that in the second region disposed in the vicinity of the symmetry plane of the permanent magnet segments, the magnetic yoke has at least one recess, which extends in the direction of the motor longitudinal axis and in the radial direction and is embodied, for example, as trapezoidal, triangular, rhomboidal, oblong, elliptical, or the like. As a result, the material quantity and therefore the weight of the yoke is reduced in the second region and the resistance for the armature transverse field is increased.
It is likewise advantageous if the recess extends to an edge of the yoke.
It is furthermore advantageous if in the radial direction, in the first region close to the end faces of the permanent magnet segments, the yoke has a greater thickness than in the second region close to the symmetry plane of the permanent magnet segments, and the yoke is then bent into a ring or is embodied as a ring by means of deep drawing.
It is likewise advantageous if the yoke comprises a pole housing and a yoke ring encompassing the yoke, wherein the permanent magnet segments are disposed in the pole housing and the yoke ring has the first and second regions.
It is likewise advantageous if the yoke comprises a yoke ring and a pole housing that encompasses the yoke, wherein the permanent magnet segments are disposed in the yoke ring and the yoke ring has the first and second regions.
With yoke ring segments, it is also advantageous to permit the segment end faces, starting from a center plane that extends perpendicular to the motor longitudinal axis and symmetrically divides the yoke ring segments, to extend to an edge of the yoke ring segments with an increasing distance from the symmetry plane of the permanent magnet segments, wherein the segment end faces extend in a straight line or in a convex manner.
It is also advantageous if from a first edge to a second edge of the yoke ring segments, the segment end faces have a distance from the symmetry plane that increases extending in the direction of the motor longitudinal axis.
It is furthermore advantageous if from a first edge to a second edge of the yoke ring segments, the segment end faces have a distance from the symmetry plane of the permanent magnet segments which alternatingly increases and decreases extending in the direction of the motor longitudinal axis.
REFERENCES:
patent: 5160867 (1992-11-01), Niemela
patent: 5201111 (1993-04-01), Prohaska
patent: 5698918 (1997-12-01), Shinoda et al.
patent: 5925950 (1993-04-01), Lau
patent: 6046519 (2000-04-01), Hanazumi et al.
patent: 6058594 (2000-05-01), Neumann et al.
Brandes Joerg
Froehlich Peter
Kobschaetzky Hans
Greigg Edwin E.
Greigg Ronald E.
Lam Than H
Ramirez Nestor
Robert & Bosch GmbH
LandOfFree
Electric 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 Electric motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electric motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2592367