DE2745569A1 - Rotary magnet with cup-shaped case - has axial and radial air gaps and guiding plate with cam path covering core or armature - Google Patents

Abstract

The rotatable magnet has an excitation coil, a pot-shaped case and a cover for the open side of the case having a core. An armature is firmly connected to a rotatable shaft passing centrally through the core and armature, and fixed axially. The magnet has an axial and a radial air-gap (a, b), produced by salient poles (10, 11) on the core (9) and armature (4), and a plate (7) mounted on the core or armature and covering the armature or core. The plate (7) has a cam path (14).

Description

Rotary solenoid

The invention relates to a rotary magnet according to the preamble of Claim 1.

In known rotary solenoids, a distinction can be made between two designs be, namely those with an axially arranged air gap and those with radially arranged air gap. According to DT - OS 23 63 818, a rotary magnet is known, in which at least one salient pole is provided on the armature and core, between these there is a constant working air gap, which either runs in the axial or radial direction, and the pole on the armature or core with respect to its contours in the area of the working air gap is designed so that the effective pole surface for influencing the torque of the magnet, which is dependent on the angle of rotation at least partially changes over the pole length.

These are rotary magnets that work according to the thrust principle work with the disadvantages that with a constant width of the air gap the already opposing or run-in pole faces no longer apply to the holding torque contribute and in which a relatively large part of the magnetic flux as leakage flux get lost. Overall, therefore, have a low energy conversion. this applies for rotary solenoids with an axial as well as for those with a radial air gap. Further are due to the difficult production of the contours on the anchor and core that Manufacturing costs are high.

The object of the invention is to provide a rotary magnet as mentioned above Art to create the one with a compact structure and economical manufacturability has higher torque and whose torque curve can be influenced, namely from the beginning to the end of the rotary movement.

According to the invention this object is achieved by an axial and a radial air gap, which is defined by the end face of the core and armature Pole and one arranged on the core or armature on the circumference and the armature or core overlapping guide plate can be formed with a control cam.

In a further embodiment of the invention, the poles of the core and Anchors formed by semi-cylindrical recesses and the resulting pronounced Poles beveled as flat surfaces in the longitudinal direction to the axis of rotation.

The advantages that can be achieved in this way are better utilization and conversion of the magnetic flux to a torque increase, the possibility to influence the torque curve over the entire range of rotation and in the easier manufacture of the pole faces with an overall compact design.

The invention is illustrated below in a drawing Embodiment described. 1 shows a rotary magnet in section FIG. 2 shows a section along the line A - B from FIG. 1 and FIG. 3 shows a section along the line C-D of FIG. 1 The one in Fig. 1 in the end of rotation The rotary magnet shown consists essentially of a pot-shaped housing 1, a cover 2 closing the end face, a coil 3, an armature 4, the non-rotatably with a bearing in ball bearings 5 and 5 'and between these in the axial Direction fixed shaft 6 is firmly connected, a guide plate 7 and a segment formed stop 8.

The cover 2 has a core 9 protruding into the interior provided, the end face is designed as a semicircular pole 10. Likewise One end face of the armature 4 is semicircular in shape as a pole 11, which faces the pole 10 in the end of rotation of the armature.

The semicircular poles are straight in the longitudinal direction to the axis of rotation beveled. This creates an axial wedge-shaped air gap at the start of rotation a formed between the poles, which becomes smaller and smaller during the turning process and in the turning end position runs parallel. The guide plate 7 is firmly connected to the core 9, which is shown in FIG its shape is adapted to the semicircular pole 10 and over this in the direction of the armature protrudes and covers the pole 11, so that there is a radial air gap b is formed and the end face is provided with a control cam 14.

As can be seen from FIGS. 2 and 3, a segment-shaped one Stop 8 in the created by the semicircular shape of the poles 10 and 11 used in the free space and connected to the lid. The stop is so wide that it also protrudes into the free space of the anchor (not visible in the figures) with the side 12 as a stop surface for the start of rotation position and the side 13 is used for the end of rotation of the armature. By inserting stop pieces with different radians, the angle of rotation can also be adjusted.

When the magnet is excited, a magnetic flux is built up, which flows over the armature, the armature poles, the air gaps to the approach of the cover and itself closes over the housing. The armature is rotated by the tangential attacking magnetic force across the air gap a, and also from the already run-in Pole surfaces a force is effective and contributes to the formation of torque.

But not only through the axial air gap but also through the radial air gap b there is a force effect, whereby the size of the overlap of the contour of the end face 11 and the protrusion and the end face training of the baffle is dependent. It is determined by the required torque curve, on top of that, there is also an influence from the angle of the straight bevel the Pole is to be expected.

Blank page

Claims (4)

Claims rotary magnet with a pot-like housing, an excitation winding, a cover that closes off the free end face of the housing with one in the interior protruding core and an anchor, which is rotatably mounted and with a axially fixed shaft running centrally through core and armature is firmly connected, characterized by an axial and a radial air gap (a or b), which by the end face of the core (9) and armature (4) pronounced poles (10) or (11) and one arranged on the core or anchor on the circumference and the anchor or core-covering guide plate (7) with a control cam (14). 2. Rotary magnet according to claim 1, characterized in that the poles are formed by the core and armature by semi-cylindrical recesses and that the resulting poles beveled as flat surfaces in the longitudinal direction to the axis of rotation are. 3. Rotary magnet according to Claims 1 and 2, characterized in that that by inserting different radians attacks (8) in the free Space of the core and its width beyond this into the free space of the anchor protruding surfaces serving as a stop, the angle of rotation is adjustable. 4. Rotary magnet according to claim 3, characterized in that the stop made of a noise and shock absorbing material, for example plastic consists.