Ring element for a rotor of an electric motor
A technology for ring-shaped components and motors, which is applied to the shape/style/structure of electrical components, electric components, and winding insulation, etc., can solve the problems of insufficient fixing of winding layers, large vibration and centrifugal force, and inability to find joints, so as to improve the use of Longevity, reduced bending angle, reduced risk of winding short circuit
Active Publication Date: 2014-03-26
ROBERT BOSCH GMBH
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Problems solved by technology
However, the innermost winding layer, which is almost in free space in the region of the winding head at the axial end region of the winding section of the electric rotor, cannot be fixed exactly in the winding group and Resin Fix Can't Find Joints
[0003] This results in the problem that the inner winding layers are not sufficiently secured in the region of the winding head and are not adequately protected not only against thermal loads but also against mechanical loads, in particular against high vibrations and centrifugal forces.
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[0024] In the figures, identical or similar components are indicated by the same reference numerals.
[0025] To illustrate the present invention, figure 1The mover 24 of the universal motor is shown in side view, the mover winding 18 being wound along the mover lamination stack 34 . The mover 24 has a mover shaft 36 along which all the rotating parts of the mover are arranged in a rotationally fixed manner. The mover laminated core 34 carries the winding 18 , which is formed as a winding head 40 at its two axial end regions 26 , 28 . In this case, the first end region 28 is assigned to the bearing 30 of the runner 24 and the second end region 26 is assigned to the commutator 32 of the runner 24 . At the commutator 32 , the current is transmitted via carbon brushes, not shown, to the mover winding 28 , wherein the rotation of the mover through the mover 24 produces a constantly rotating motor due to the alternating energization of the mover winding 18 in the mover 24 . magn...
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The invention relates to a ring element (10) comprising a convex, in particular rounded surface element (12) for arrangement on at least one axial end region (26, 28) of a winding section (16) of an electric motor rotor (24), wherein the surface element (12) provides a minimum radius curvature Rd for supporting an inner layer (38) of a rotor winding (18) on the winding head (40). In another aspect, the invention relates to an insulating lamination element (22) for an electric motor rotor (24) onto which a rotor winding (18) is intended to be wound, said insulating lamination element comprising an above-mentioned ring element (10). Furthermore, the invention relates to an electric motor, in particular a universal motor comprising a rotor (24) with a rotor winding (18) having at least one above-mentioned ring element (10) and an electric machine tool, in particular a handheld electric machine tool such as an angle grinder, a drill, a saw or the like, which comprises such an electric motor.
Description
technical field [0001] The invention relates to an annular element for arrangement on at least one axial end region of a winding section of an electric rotor. Furthermore, the invention relates to an insulating sheet element comprising a ring element according to the invention. Finally, the invention also relates to an electric motor, the runner of which is arranged with such a ring element, and to an electrical machine tool comprising an electric motor according to the invention. Background technique [0002] In electric motors for electrical machine tools, in particular angle grinders, drills, saws, jigsaws or the like, generally universal motors are used, that is to say series motors, the mover of which carries a mover winding which is passed through Commutator power supply. In the region of the winding head at the axial end region of the winding section, in particular the inner winding layer has a small radius of curvature and is exposed to high mechanical and thermal ...
Claims
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IPC IPC(8): H02K3/51H02K3/38
CPCH02K7/145H02K3/38H02K3/30H02K3/51H02K3/50
Inventor J.埃夫勒C.瓦格纳J.沙多J.海因J.格纳
Owner ROBERT BOSCH GMBH