Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-05-07
1991-12-03
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
192 138, H02K 17102, B60K 4108
Patent
active
050702661
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an electromechanical device for stopping a shaft in at least one position.
There is a demand for many motor drives to have the drive remain in the position it is in at the time it is turned off or for a precisely defined starting position to be maintained prior to removal of a brake from the drive and activation of the motor drive.
DE-OS 2,601,558 discloses an electromechanical brake device for electric motors, in particular, for lower performance motors, on whose shaft, preferably on a second free shaft end, is disposed a brake cam disk, which is not rotatable, or rotates against resistance in circumferential direction, having one or a plurality of cams which, when the motor is turned off from the supply current, are engaged by a blocking element operating, for example, by the resilience of a spring. The blocking element is part of a special electromagnet, which at the start of the motor is also connected to the current and thus magnetically disengages the blocking element again from its engagement with the cam(s) of the brake cam disk.
SUMMARY OF THE INVENTION
It is the object of the invention to produce an electromechanical device for stopping a shaft in which the function of stopping, independent of the great accelerations in all three space axes is effective. The electrical energy required for unlocking should be as low as possible.
The solution is found by means of an electromechanical device according to the invention for stopping a shaft in at least one position having an electromagnet, a locking pawl operable by means of the electromagnet, a component connected with the shaft which the locking pawl engages in its stop position and a spring which counteracts the force exerted on the locking pawl by the excited electromagnet. The electromechanical device is characterized by the component being a toothed wheel connected to the shaft and the locking pawl being provided with corresponding toothing for engaging the toothed wheel. There is a coil of the electromagnet arranged coaxial to the shaft axis, the coil being housed in a housing of permeable material having an E-shaped cross section, and at a central portion of the housing a rotational armature of permeable material is disposed which has at least one pole shoe. At an interior face of a housing wall at least one pole shoe of permeable material is arranged on a plane with the rotational armature, with the pole shoes being arranged in such a way that their radial ends face one another while forming a small radial air gap. Between the rotational armature and the locking pawl there is a connection comprising a guide pin and a delimited guide slot, the connection being arranged in such a way that during a rotational movement of the rotational armature the locking pawl is moved radially and as a result, the locking pawl is brought out of or into its stopping position in accordance with the direction of the rotational movement and that the rotational movement of the rotational armature is delimited in such a way that an unexcited electromagnet causes the frontal faces of the pole shoes to overlap only slightly while an excited electromagnet causes them to overlap to a greater degree, although not completely.
Advantageous embodiments are set forth in the dependent claims.
The invention is further explained below by way of an embodiment.
BRIEF DESCRIPTION OF THE DRAWINGS
It is shown in:
FIG. 1, a top view of the stop device according to the invention; and
FIG. 2, a side view of the stop device according to the invention as a section of the A - B plane in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The housing 1 of the stop device in FIG. 1 comprises soft iron and has the shape of a square. A threaded bore 2 is disposed in each of the four bevelled corners of the housing 1 for fastening the stop device to a motor unit (not shown).
For connecting the stop device to a control device, connecting wires 10 from coil 18 of the electromagnet extend through one surface of the housing.
On the interi
REFERENCES:
patent: 3022432 (1962-02-01), Timmer et al.
patent: 4022069 (1977-05-01), Boyer
patent: 4071121 (1978-01-01), Daniel
patent: 4515251 (1985-05-01), Wruk
patent: 4746826 (1988-05-01), Burney
patent: 4750375 (1988-06-01), Godesa
Janczak Christian
Schopp Richard
Rebsch D. L.
Stephan Steven L.
Teldix GmbH
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