CS217489B1 - Synchronous Motor Rotor Damper with Stepping Features - Google Patents

Abstract

Rotor damper for a synchronous motor with stepper characteristics The invention relates to a rotor damper for a synchronous motor with stepper characteristics. Some types of stepper motors have a significantly reduced torque when increasing and decreasing the speed in certain areas of the supply frequency, or are not able to operate at all. These disadvantages can be overcome according to the invention, which consists in the fact that the grooves of the rotor bundle of sheets are filled with electrically conductive material around the circumference and the groove filling is interconnected with electrically conductive rings at the edges of the rotor bundle. The design of the rotor damper can be used for small, medium and larger types of stepper motors.

Description

The present invention relates to a rotor damper of a synchronous motor with stepping properties.

Some stepper motor sizes increase and decrease speeds in certain areas of the power frequency have a significant torque, or are not capable of operating at all.

These drawbacks can be avoided according to the invention, wherein the grooves of the rotor bundle of the plates are circumferentially filled with an electrically conductive material and the groove filler is connected to the edges of the rotor bundle by electrically conductive rings.

The rotor damper design can be used with small, medium and larger types of stepper motors. 217488 -X., .. 2

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a rotor damper of a synchronous motor with stepping properties, consisting of magnetic circuits, of a weight in sheets with grooves on the outer circumference of permanent magnets with pole pieces.

The jogging process of such an engine can take place over a very wide range, for example, from one to 40,000 steps per second, so that at two hundred steps per revolution the speed is 0.005 to 200 per second, i.e. 0.3 to 12,000 rpm. This is an extremely wide speed range where a stepping process takes place in the low step frequency area from one position to another and is accompanied by subdued rocking. In the area of the higher stepping frequency, the jogging mode is manifested by oscillation or torque variation. Only in the high speed range does the motor run quietly with an invariable speed change depending on the constant frequency of the pulsed power supply. When increasing the speed and thus also when starting the engine or vice versa in reducing the speed and thus stopping the motor, the phenomena follow each other and thus pass from one of their characteristic forms to the other. In summary, these phenomena are manifested in such a way that some type of stepper motors are incapable of operation in certain areas of the supply frequency, and possibly their torque is significantly compressed. . In this case, the irregular operation of the stepper motor is manifested by noise, vibration, torsional vibration and torque seats. These unfavorable properties occurring during the operation of the stepper motor can be improved by mechanical means or by adjusting the pulsed power supply.

The above drawbacks can be suppressed and reduced according to the invention, in that the grooves of the rotor bundle are

Claims (2)

SUBJECT Rotor damper of synchronous motor with stepping properties, consisting of magnetic circuits, sheet metal grooves with grooves on the outer circumference and permanent magnets, characterized in that the grooves (1) of the rotor bundle (4) are filled with groove in the outer circumference. electrically good conductive material. An electrically conductive material is grooved on the edges of the rotor bundle by electrically conductive rings. In the accompanying drawing, FIG. 1 shows a longitudinal section of a rotor of a stepper motor and FIG. 2 shows a cross section of a rotor of a stepper motor. Fig. 1 is a longitudinal and cross-sectional view of a stepper motor where the grooves 1 of the rotor bundle 4 of the plates are filled with a groove filling 2 of electrically conductive material all over the outer periphery. The groove filler 2 is connected to the inner 5 and outer 6 edges of the rotor bundle 4 by electrically conductive rings 3. Changes in the stepping frequency during acceleration or deceleration occur during the operation (even in idle mode), a resonant phenomenon similar to that of a synchronous machine occurs. The rotor damper reduces, eventually prevents the occurrence of resonant phenomena. Said groove filler 2 of electrically conductive material and interconnected by electrically conductive rings 3 creates a so-called cage similar to that of an asynchronous squirrel-cage motor. Swing is a periodic movement of the rotor, which consists of the rotation of the rotor, which moves at a constant synchronous speed. This phenomenon can occur after deflection from the equilibrium position, resulting in a returning moment to fall to the equilibrium position. However, the inertia position of the rotor takes place in an equilibrium position and overlaps to the opposite side, while forcing the moment acting in the opposite direction. As a result of the damper and the closed magnetic circuit in which the currents are induced during rocking, the rocking is damped. The design of the rotor damper can be used advantageously both in small stepper motors with active rotor and of course for stepper motors of medium and higher type sizes. BACKGROUND OF THE INVENTION The outer periphery is filled with a groove filler (2) of electrically conductive material and the groove filler (2) is connected to the edges of the rotor bundle (4) by electrically conductive rings (3). 2 drawings ^ ϊί * ιΊι ' FIG. 1 REZ A-A 2 1748 9 Fig. 2