Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1994-04-11
1996-09-10
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310216, 310254, 25112911, H02K 2114, H02K 112, F16K 3102
Patent
active
055549012
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a servo-drive for rotary angle adjustment of an actuator as set forth hereinafter. A servo-drive is already known (DE 30 39 521 A1) in which a rotor is partially surrounded in the circumferential direction by a stator which is provided with asymmetrically constructed pole shoes and in which a magnetic field can be induced by means of an exciter winding. Since, in the prior art device, the stator is either of a two-component design or the exciter winding has to be applied directly to the stator, and as a result of the asymmetrical construction of the stator poles, this device is associated with a complex production method which is very expensive particularly for series production.
ADVANTAGES OF THE INVENTION
The servo-drive according to the invention has an advantage that the stator which surrounds the rotor is of single-component design, as a result of which simple insertion of the exciter winding into the stator is ensured. This is achieved in that the stator completely surrounds the rotor and the exciter winding is inserted between two legs constructed on the outside of the stator. Moreover, the construction of weak points in the stator poles permits the torque/rotary angle characteristic of the servo-drive to be optimized.
By means of the measures disclosed in the subclaims, advantageous further developments and improvements of the servo-drive specified herein are possible. It is particularly advantageous to produce the stator from individual sheet-metal laminas which each have recesses and/or gaps in the region of the poles and are combined to form a single-component stator packet. In particular by virtue of the sheet-metal laminas which have gaps, the magnetic properties of the stator are influenced as desired whilst the coherence of the stator packet is maintained by means of the sheet-metal laminas having recesses, and, in this way, a production-friendly further processing is ensured.
DRAWING
An exemplary embodiment of the invention is illustrated in the drawing in simplified form and explained in greater detail in the subsequent description. FIG. 1 shows a longitudinal section through a rotary actuator designed according to the invention, FIG. 2 shows a section along the line II--II in FIG. 1.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
In FIG. 1, a rotary actuator for controlling the cross-section of an opening of a medium-conducting flow line for internal combustion engines is illustrated. A rotary actuator of this kind serves for example for controlling the idling speed of the internal combustion engine and is arranged in a bypass line which shunts out a throttle valve. The rotary actuator is composed of a servo-drive which is labelled with 1 and an actuator housing 22. The servo-drive 1 has a drive housing 2 made of plastic which encloses a stator 3, consisting for example of sheet-metal laminas 6, and a winding 5 arranged around an induction core 4. In a depression 8 of the drive housing 2 a holding element 9 is seated, the said holding element 9 has a bore 10 into which one end of an axle 11 is inserted. A carrier element 17 is rotatably mounted, for example by means of a roller bearing 15 and a sliding seat 16, on the axle 11 which is secured on the other hand in the actuator housing 22, for example by means of encapsulation by injection moulding. In the circumferential direction, the carrier element 17 is surrounded by a diametrically magnetized permanent magnet 18 and a control element 19, the parts 17 and 18 forming together a rotor 14 of the actuator drive 1 which turns the control element 19.
On the control element 19, a control arm 23 is constructed which protrudes into a control chamber 25, located in the actuator housing 22, and whose outer face 24 is shaped in such a way that it corresponds as precisely as possible to the internal diameter of an actuation window (not illustrated in greater detail in the drawing) of a flow opening leading into the control chamber 25, and clears the flow opening to a greater or lesser extent depending on the r
REFERENCES:
patent: 1538196 (1925-05-01), Livingston
patent: 2323114 (1943-06-01), Bradford et al.
patent: 4262353 (1981-04-01), Okazaki et al.
patent: 4398107 (1983-08-01), Fukushima
patent: 4618792 (1986-10-01), Yates
Altmann Michael
Dick Dieter
Franz Manfred
Hammer Uwe
Meiwes Johannes
Greigg Edwin E.
Greigg Ronald E.
LaBalle Clayton E.
Robert & Bosch GmbH
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