DE2123676C3 - Synchronous micro motor with hysteresis rotor and loaded and unloaded stator poles partially overlapping in the circumferential direction - Google Patents

Description

The invention relates to a synchronous miniature motor with hysteresis rotor in which the hysteresis rotor is arranged in an annular air gap between a loaded and unloaded Poles of the inner stator part having a polarity and a likewise loaded and unloaded part Poles of the other polarity having outer stator part is formed, in which motor each one unloaded and a loaded pole of the outer stator part and the inner stator part each have a pole group pipe form, wherein the pole groups of a stator part essentially the gaps between the pole groups of the other stand part opposite and borrowed partially cover in the circumferential direction and further the loaded poles of one stator part are adjacent to the unloaded poles of the other stator part are.

Such a synchronous main motor is known from DT-AS 14 88 126. By dimensioning the cross-sections of loaded and unloaded pole arms in such motors, the magnetic relationships between the main and phase-shifted auxiliary flux have been matched, and therefore certain optimal values for the starting and synchronous torque have been achieved. The special design of its Ständerpolzähne has been chosen so as to kön- using same by simply reversing the direction of rotation of the engine after the assembly 676

nen. A further increase in the starting and synchronizing torque by further improvements of the magnetic conditions of the hysteresis rotor is therefore Hardly any more to be expected with this version.

The invention has for its object to be a To create synchronous miniature motor of the type described above, its starting and synchronous torque is increased beyond the values achieved by optimizing the hysteresis runner.

The object is achieved according to the invention in that the magnetic resistance between an unloaded pole of the outer stator part and a loaded pole of the inner stator part is enlarged in the area of their overlap.

According to a further embodiment of the invention, a synchronous miniature motor with a radial directed pole arms having inner stator part an increase in the magnetic resistance achieved in a simple manner that the loaded poles of the inner stator part in the by the unloaded Poles of the outer stator part covered area provided with a radially extending bevel are.

On the basis of an embodiment shown in the drawing the subject matter of the invention is described in more detail below. It shows

F i g. 1 is a schematic representation of the synchronous Kleinstmoiors according to the invention in section,

F i g. FIG. 2 is a plan view of the FIG. 1 shown Motor with the hysteresis rotor removed.

In Fig. 1, I denotes a hysteresis rotor, which is loaded in an annular air gap between the and unloaded poles 2 and 3 of an outer stator part 4 and the loaded and unloaded Poles 5 and 6 of an inner stand part 7 runs. The hysteresis rotor 1 is connected to a shaft 8, which is mounted in two bearings 9, which in a bore 10 of the two stand parts 4 and 7 magnetically Conductively connecting coil core 11 are arranged. The coil core 11 is surrounded by a coil 12 through which the stator circle of the synchronous miniature motor is excited. To load the poles of the outer stator part 4 is a short-circuit ring 13 and to load the poles of the inner stator part 7, a further short-circuit ring 14 is provided.

As shown in FIG. 2 can be seen, the loaded poles 5 of the inner stator part 7 are in that of the unloaded Poles 3 of the outer stator part 4 in the circumferential direction covered area with a radial Direction running bevel 15 is provided. This bevel creates the air gap between the unloaded poles 3 of the outer stator part 4 and the loaded poles 5 of the inner stator part 7 and thus the magnetic resistance between these poles increases.

It was recognized that between the unloaded poles 3 of the outer stator part 4 and the loaded Poles 5 of the inner stator part 7 a part of the magnetic flux perpendicular through the hysteresis rotor 1 passes through and thus a weakening and distortion of the longitudinal magnetization of the hysteresis rotor 1 cause! · .. By the proposed according to the invention increase in the magnetic resistance between the unloaded poles 3 of the outer stator part 4 and the loaded poles 5 of the inner Stand part 7, the magnetic shunt is eliminated, so that the otherwise crossing between these poles Part of the magnetic flux now the

Hysteresis rotor I also flows through in the longitudinal direction and only crosses over to the other part of the stator at the corresponding opposite pole. By the measure after according to the invention, a substantial increase in the starting and synchronizing torque is achieved.

1 sheet of drawings

Claims (2)

Patent claims: 21 ! Synchronous micro motor with hysteresis rotor, in which the hysteresis rotor is arranged in an annular air gap. the burdened between one and unloaded poles of the inner stator part having one polarity and one likewise loaded and unloaded poles of the other polarity exhibiting outer stator part is formed, at which motor one unloaded and one loaded pole of the outer stator part and the inner one Stator part each form a pole group, the pole groups of one stator part essentially face the gaps between the pole groups of the other stator part and »Cn partially cover cn in the circumferential direction and furthermore each of the loaded poles of the one stator part are adjacent to the unloaded poles of the other part of the stand, characterized in that, that the magnetic resistance between an unloaded pole (3) of the outer stator part (4) and a loaded pole (5) of the inner stator part (7) in the area of their overlap is enlarged. 2. Synchronous micro motor according to claim I with a radially directed pole arm having inner Stand part, characterized in that the loaded poles (5) of the inner stand part (7) in the area covered by the unloaded poles (3) of the outer stator part (4) with a radial extending bevel (15) are provided.