Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1986-10-14
1988-03-22
Salce, Patrick R.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 83, 310171, 340347P, H02K 1100, G01B 730, G01D 504
Patent
active
047331160
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an angle transmitter containing cooperating with the stator through a limited angular range for producing an output signal dependent upon the rotational angle, rotor.
BACKGROUND ART
German Patent Publication No. 3,212,149 describes an angle transmitter in which the stator contains a coil wound along a circular arc and containing a central tap. The coil is seated upon an annular core made of non-magnetic material and having substantially rectangular cross-section. Strips of magnetic material are inserted into the interior surface and into the exterior surface of the annular core. This stator is seated in a flat box-shaped housing. The rotor is journalled in the housing by means of a shaft. The rotor is constructed as a rotary member containing a disc and two coaxial ribs extending along the circumference of the disc. The ribs extend internally and externally around the coil. The rotor is manufactured from non-magnetic material. Strips of ferromagnetic material are sunk into the outer side of the inner rib, into the inner side of the outer rib, which sides face the coil. These strips extend over part of the circumference. The ferromagnetic strips affect the stray field and effect a change in the inductances of the coil portions on both sides of the central tap when the rotor is rotated. A circuit arrangement responds to these changes for generating an angle signal. In the known angle transmitter the rotor can be rotated through full circle. However, an angle signal which is proportional to the rotational angle, can be obtained only through a limited angular range of, for example, 90.degree..
For this reason the known angle transmitter has been provided with a reducing gear. An input shaft is coupled to the rotor via such reducing gear. Therein the input shaft jointly with the reducing gear is seated in a separate housing which is attached to the recited flat housing according to German Patent Publication No. 3,212,149. The output shaft of this gear is coupled to the shaft which carries the rotor. The input shaft, then, can be rotated through 360.degree. or, if required, even through a greater angle, whereas the rotor moves within the range in which a linear angle signal is obtained. The circuit arrangement which responds to changes in the inductances of the two coil portions for generating the angle signal is also accommodated in a separate housing, which is attached to the flat housing of the actual angle transmitter in a practically realized known arrangement of the type according to German Patent Publication No. 3,212,149.
Thus, for the overall arrangement, there result relatively great axial dimensions which are undesired for many uses.
The same problem also occurs in angle transmitters operating according to a different principle, for example, in angle transmitters in which an armature which contains a core of low-retentivity material, more or less widely extends into arcuately wound coil portions and the core is moved farther into the one coil half and correspondingly farther out from the other coil half when the armature is rotatably moved out from a central position.
German Patent Publication No. 3,325,318 describes an incremental angle encoder containing means for optional adjustment of an absolute zero point or reference point. These means consist of a reducing gear which is coupled to the angle encoder shaft on the drive side and on the driven side to a disc comprising an opto-electronically scannable bore or light reflection mark. The disc constitutes a gear wheel which is coupled to the reducing gear by means of a sliding clutch and which can be externally adjusted using a tooth wrench provided with a pinion. The absolute zero point thereby can be adjusted for the incremental angle transmitter.
In this arrangement the disc of the angle encoder, the reducing gear which is constructed as a planetary gear, and the gear wheel are axially series arranged. Thus there results an undesirably great overall length which is a bar to the accommodation in a flat h
REFERENCES:
patent: 3253260 (1966-05-01), Hawley
patent: 3679922 (1972-07-01), Rahn
patent: 3772675 (1973-11-01), Bose et al.
Oelsch Kommanditgesellschaft
Rebsch D. L.
Salce Patrick R.
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