DE2123676A1 - Synchronous micro motor with hysteresis rotor - Google Patents

Description

Synchronous micro motor with hysteresis rotor

The invention relates to a synchronous miniature motor with hysteresis rotor, in which the hysteresis rotor is 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 arranged, in each of which an unloaded and a loaded Pole of the outer stator part and the inner stator part each form a pole group and the pole groups of one stator part arranged opposite the gaps between the pole groups of the other stator part and in each case the loaded poles of one stator part are adjacent to the unloaded poles of the other stator part.

Such a synchronous miniature motor is from the German patent application 1 488 126 known. By optimizing the magnetic conditions of the hysteresis rotor one has with such Motors reached certain optimal values for the starting and synchronous torque. A further increase in the start-up and synchronous torque through further improvements in the magnetic conditions of the hysteresis rotor is therefore hardly ' expected more.

The invention is based on the object of a synchronous miniature motor to create the type described above, whose starting and synchronous torque over the optimization of the Hyoteres runner's achieved values

eats.

209847/0538

BATH ORIGINAL

- 2 - VPA 71/3107

The object is achieved according to the invention in that the magnetic resistance between the two poles in the area covered in the circumferential direction by an unloaded pole of the outer stator part a loaded pole of the inner stator part is enlarged.

According to a further embodiment of the invention, in a Synchronous micro motor with a radially directed pole arm inner stator part an increase in the magnetic resistance is 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 are beveled in the radial direction.

The subject matter of the invention will be explained in more detail below with the aid of an exemplary embodiment shown in the drawing described. It shows:

Pig. 1 is a schematic representation of the synchronous micro

motors according to the invention in section, Pig. 2 is a top plan view of the in Pig. 1 shown motor, with the hysteresis runner removed.

In Fig. 1, 1 denotes a hysteresis runner, which in an annular air gap between the loaded and unloaded poles 2 and 3 of an outer stator part 4 and the loaded and unloaded poles 5 and 6 of an inner one Stand part 7 is running. The hysteresis rotor 1 is connected to a shaft 8 which is mounted in two bearings 9, the one in a bore 10, the two stand parts 4 and 7 magnetically conductive connecting coil core 11 are arranged. The coil core 11 is surrounded by a coil 12.;, By which the stator circuit of the synchronous miniature motor is excited. To load the pole of the outer stator part 4 is a Course closing ring 13 and to load the poles of the inner Stand part 7 a further course closing ring 14 -provided o

'709847/0138 BAD ORIGINAL

- I -

VPA 71/3 ¹ 07

Like from Pig. 2 are the loaded poles of the inner stand part 7 in that of the unloaded. Poles 3 of the outer stand part 4 covered in the circumferential direction Area provided with a bevel 15 running in the radial direction. This bevel creates the air gap between the unloaded poles 3 of the outer stator part and the loaded poles 5 of the inner stator part 7 is enlarged and thus the magnetic resistance between these> poles increases.

It was recognized that between the unloaded poles of the outer stator part and the loaded poles of the inner ™ Stator part a part of the magnetic flux passes vertically through the hysteresis rotor and thus a Causes weakening and distortion of the longitudinal magnetization of the hysteresis rotor. By 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 stator part 7, the magnetic shunt is eliminated, so that the otherwise between Part of the magnetic flux which crosses these poles now also flows through the hysteresis rotor in the longitudinal direction and only crosses over to the other part of the stator at the corresponding opposite pole. By the measure according to the invention | a significant increase in the starting and synchronizing torque is achieved.

2 claims

209847/0538

Claims (2)

- 4 - VPA 71/3107 Claims M.JSynchronous micro motor with hysteresis rotor, in which the Hysteresis rotor in an annular air gap between a "loaded and unloaded pole of one polarity having inner stator part and a likewise loaded and unloaded pole having the other polarity outer stator part is arranged, in each of which an unloaded and a loaded pole of the outer, Stator part and the inner stator part each form a pole group and the pole groups of one stator part arranged opposite the gaps between the pole groups of the other stator part and each loaded Poles of one stator part are adjacent to the unloaded poles of the other stator part, characterized in that that the magnetic resistance between the two poles in that of an unloaded pole (3) of the covered outer stand part (4) in the circumferential direction Area of a loaded pole (5) of the inner stator part (7) 'is enlarged. 2. Synchronous micro motor according to claim 1, with a radial directed pole arms having inner stator part, characterized in that the loaded poles (5) of the inner stator part (7) in the area covered by the unloaded poles (3) of the outer stator part (4) are beveled in the radial direction. 209847 / 053B