SU1128342A1 - Electric step motor - Google Patents

Abstract

STEP ELECTRIC MOTOR containing a ferromagnetic rotor and a stator consisting of segments of magnetically soft material located along the circumference of the rotor, insulated from each other in magnetic field and grooves on which the ring is located. The winding around the back of the segment, characterized by the fact that, in order to increase the use of active materials, increase the electromagnetic moment, decrease losses and dimensions of the engine, the grooves are also made on the outer cylindrical and end surfaces of the x segments. parts and covers the stator from all sides, while the angular width of the rotor tooth is in the range from the width of the stator groove to (L the sum of the width of the stator groove and twice the width of the stator tooth.

Description

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This invention relates to electrical engineering, namely, to stepper motors.

A stepping motor is known, comprising a stator with windings and a toothed .5 ferromagnetic rotor located inside the stator 11.

The disadvantages of this engine are the poor use of active space and large size. tO

The closest to the invention to the technical essence is a stepper electric motor comprising a serrated ferromagnetic rotor and a stator consisting of segments of magnetically soft material arranged along the circumference of the rotor, insulated from each other magnetically and having slots on the inner cylindrical surface in which there is a 20 ring winding encircling the back of the segment 2j.

A disadvantage of the known engine is the use of active materials. 25

The purpose of the invention is to increase the use of active materials, increasing the electromagnetic moment, reducing losses and engine dimensions .30

The goal is achieved by the fact that in a stepper motor containing a toothed ferromagnetic rotor and a stator consisting of segments of magnetically soft material located along the circumference of the rotor, magnetically insulated from one another and magnetically isolated on the inner cylindrical surface of the grooves, ring winding , grabbing the Q-back of the segment, the grooves are also made on the outer cylindrical. and the end surfaces of the segments, and the rotor is made of two symmetrical parts and encompasses the stator from all sides, with the angular width of the tooth- and the rotor centering within the width of the stator groove and the sum of the width of the stator groove the stator. 50

Such an implementation of an electric motor makes it possible to make the most of the active space, reducing its size, reducing losses and increasing the electromagnetic moment.55

FIG. 1 shows the engine in cross section, and FIG. 2 - the same, longitudinal section.

The stepping motor comprises a ferromagnetic stator consisting of segments 1 arranged along the circumference of the rotor of a magnet of a soft material. The segments are magnetically isolated from each other by non-magnetic sections 2. The segments have grooves in which sections of windings 3-18 are located, teeth of 19 segments abut on the sections of windings on both sides. A stator with windings is mounted on a stationary shaft 20. On the same shaft there is a gear ferromagnetic rotor 21 installed in bearings 22. The rotor 21 consists of two symmetrical parts 21 and 21, which enclose a stator from all sides and have upper 23 and lower 24 teeth. For the motor (Figures 1 and 2), the angular width of the rotor tooth B is equal to the sum of the width of the groove of the stator and the width of the two teeth of the stator 2W and the non-magnetic section taken to be 0.5V. In general, the angular width of the rotor tooth is between the width of the groove and the sum of the width of the stator groove and twice the width of the tooth. The winding sections are combined into phases. FIG. 1 shows a four-phase motor, the first phase is formed by the windings 3, 8, 11, 16, the second - the windings 5, 10, 13, 18, the third - the windings 4, 7, 12, 15 and the fourth - the windings 6, 9, 14, 17.

The engine works as follows.

When phase 1 is connected to the power source, the rotor takes a position when its teeth are aligned to the teeth of the stator adjacent on both sides to the windings 3, 8, 11, 16 (Fig. 1).

In the phase switching mode, one of the four phases is alternately turned on. The sequence of their inclusion determines the direction of rotation of the rotor. The angular displacement of the rotor with a serial commutation, - :.

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i.e. engine pitch equals et rn

where m is the number of phases, and t is the toothed division of the rotor. For the case shown in FIG. 1, the engine pitch is equal to L-1,5bzs.

Due to the implementation of the slots under the stator winding on the inner, outer and side surfaces of the segments, as well as covering the stator from all sides by the rotor, the frontal parts of the winding are practically eliminated. It contributes

3 11283424

reduce scattering fluxes, increase. This results in a decrease in the electromagnetic momentum and co-loss in the engine and increases the utilization rate of active materials.

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Claims (1)

. STEP ELECTRIC MOTOR, containing a gear ferromagnetic rotor and a stator, consisting of segments of magnetically soft material located along the circumference of the rotor, magnetically isolated from one another and having grooves on the inner cylindrical surface, in which an annular winding is wrapped around the back of the segment, characterized - that, in order to increase the use of active materials, increase the electromagnetic moment, reduce losses and dimensions of the engine, the grooves are also made on the outside and end faces of cylindrical poverhnos • tyah segments, and the rotor is formed of two symmetrical parts and covers the stator from all sides, wherein the angular width of the rotor tooth located. in the range from the width of the stator groove to the I sum of the width of the stator groove and the doubled stator tooth width.