SU1739446A1 - Valve-type inductor motor - Google Patents

Abstract

Use: high-torque electric drives. The essence of the invention: the motor consists of a rotor 1 with teeth 2 and a stator 3 with 2 tr poles, on the inner surface of which elementary teeth 16 are made. the same In the grooves between the teeth 16 on 2mq adjacent poles (q 1, 2p) are placed the coils of the sensor 18,

Description

The invention relates to synchronous electric machines and can be used, for example, in high-torque electric drives.

A valve motor containing a stator with an m-phase winding and a rotor with permanent magnets is known, a position sensor, made as a separate electric machine, is located on the same shaft as the motor.

The disadvantage of such a valve motor is a complicated structure, which is due to the presence of an additional electric machine,

A valve inductor motor is known, which contains a serrated rotor and a stator with teeth, in which grooves between which an m-phase motor winding and an m-phase position sensor coil are assembled, are assembled in phases into successive branches, each branch is formed by coils displaced along the bore by an angle of 360 el .grad., interconnected end with end, beginning with beginning.

A disadvantage of the known engine is the limited scope due to the low accuracy of the position sensor.

The aim of the invention is to expand the field of application of a valve induction motor by increasing the accuracy of the sensor.

In a valve inductor motor containing a serrated rotor and a stator with poles, on which the coils of the m-phase sensor are located, assembled in phases in successive branches, and in large grooves between the poles there is a motor winding, the stator is made with 2tp poles (p 2, 3, 4, ...), on the inner surface of which there are zs of elementary teeth, the tooth divisions of the stator and the rotor tz being the same, and the distance between the axes of the adjacent teeth belonging to different poles is (Ktf 1 / 2.m ) tz (K 1, 2, ...), in the grooves between the elementary 2mq of the adjacent poles (q 1, 2p) are packed with coils dat-

one on each half of the pole, coils located on the same pole,

are connected according to the end with the end and form a coil group, coil groups located at the poles with sequence numbers that differ by 2m, counting clockwise along the stator bore, are connected in series with the beginning and form branches, branches with coil groups located at the poles with sequence numbers differing by m, the end with the end are connected in series, the points of the m-phase input of the sensor are made at the connection points, and the beginnings of m branches, which are the beginnings of coil groups located on poles with odd and even numbers, and are connected together at the points of a single phase compound formed conclusions position sensor input.

In a valve inductor motor, the sensor coils in elementary slots can be assembled into two m-phase circuits, with the windings of each sensor circuit being placed at least 2 tons of adjacent poles.

FIG. 1 shows a vertical induction motor, a slit; in fig. 2 is a diagram of the connection of the sensor coil groups; in fig. 3 shows the connection diagrams of the coil groups of the position sensor and the speed sensor of the tachogenerator; in fig. 4 is a plot of the distribution of the conductivity of the air gap.

Consider a three-phase induction valve motor with 12 poles,

The motor (Fig. 1) consists of a rotor 1 with teeth 2 and a stator 3 with poles 4-15, on the inner surface of the poles elementary teeth 16 are made. A three-phase motor winding is placed in the large grooves between the poles 17. In the engine, the number of elementary teeth at the pole zs equal to four. The tine divisions tz of the rotor 1 and the stator 3 are the same. The distance between the axes of the adjacent teeth belonging to different poles, for example the fourth and the fifth poles, is taken to be 7/6 tz (K 1). In the grooves between the elementary teeth 16 laid coil sensor 18, one for each half of the pole.

Two coils of the sensor, located on the same pole, are connected in series and in accordance with the end with the end and form coil groups 19-30 (Fig. 2 and 3). It is assumed that the coil group 19 is located at the fourth pole, the coil group 20 at the fifth pole, the coil group 21 at the sixth pole, etc. The coil groups located at the poles with serial numbers different by 2m 6, for example, the coil group 19 at the fourth pole and the coil group 25 at the tenth pole, are connected in series with the beginning and form branches. Thus, in FIG. Figure 2 shows six branches, which include coil groups 19 and 25, 21 and 27, 23 and 29, 22 and 28, 24 and 30, 20 and 26.

The branches with the coil groups located at the poles with sequence numbers differing by m 3 are connected in series with the end to the end. For example, the coil groups 19, 25, 22, 28 are located at the poles with sequence numbers that differ by three. For the beginning of the branches, the beginnings of the coil groups 19 and 28 are ends — the ends of the coil groups 25 and 22. The branches are connected in series and the three-phase inputs A, B, C are made at the connection points. numbers, i.e. the beginning of the coils 28, 30 and 26 are connected together. Also, the beginnings of the branches are connected to the coil groups located on the poles with even-numbered sequence numbers — the beginnings of the coils 19, 21,23.

Single-phase inputs are made at the connection points. The windings of the position sensor may not be located at all poles (Fig. 2), but on their parts, for example, at six poles 19-24 (Fig. 3). The remaining six poles can also include 25-ЗП coil groups assembled in a circuit similar to that of a position sensor and used as a speed sensor (tachogenerator).

The engine works as follows.

When the position sensor (Fig. 2) is connected to a high-frequency AC source, the currents flow from the branches formed by the coil groups, for example 19, 25, 22 and 28. Since in the engine the electrical shift between adjacent poles is 60 degrees, the geometric shift between the teeth axes at the adjacent poles is 1/6 tz, when the rotor position changes, the inductance of the branch does not change. If, for example, the coincidence of the axes of the teeth

stator and rotor occurs at the poles 4 and 10 of the coil groups 19 and 25, then in the region of poles 7, 13 the axis of the tooth coincides with the axis of the groove, and the magnetic conductivity of the air gap from pole to pole - 6 at this position of the rotor changes in accordance with FIG. . 4. Due to the maximum difference of inductive resistances in branches x with coil groups 19.25 and 22.28, the potential UA of point A at the moment of time t О is maximum. When the rotor rotates at a speed i) p, the potential of the UA changes according to the law

UA UAm. Siflto t. Sin z2 w pt

where zs is the number of teeth of the rotor, and the potentials UB, Uc will be shifted relative to the UA at an angle of + 120 al. The potentials UA, UB, Uc varying with the position of the rotor are used to switch the m-phase windings of the engine 17.

In the case when the coil groups 19-30 are assembled into two circuits of three-phase sensors, one of the sensors, for example, formed by the coil groups 19-24, is powered by a high frequency and is a rotor position sensor, and the second (Fig. 3) formed by the coil groups 25 -30, powered by direct current and is a speed sensor (tachogenerator). The output signals of the tachogenerator UAZ, UB2, and Ucz are proportional to the rotational speed of the rotor Wp and are used to improve the stability of speed and positioning accuracy.

In contrast to the known motor, in the present invention there is completely no transformer connection between the windings of the motor and the sensor. This is due to the location of the motor and sensor windings in different slots, which reduces the transformer coupling in dissipation flows, and also due to the compensation of the magnetic fields of the engine with two sensor coils at each pole, which makes the sensor less sensitive to manufacturing inaccuracies. The absence of a transformer connection with the motor windings improves the accuracy of the position sensor, which expands the field of application of a valve induction motor. In addition, the expansion of the functionality of the engine is achieved by providing measurements of the speed of rotation of the shaft.

Claims (2)

1. Valve inductor motor containing a gear rotor and a stator with poles, on which are located the coils of the m-phase sensor, assembled in phases in consecutive branches, and in large grooves between the poles there is a motor winding, characterized in that, in order to expand the field of application by increasing the accuracy of the sensor, the stator is made with 2t poles (p 2, 3,4, ...), on the inner surface of which the elementary teeth are located along zs, the tooth divisions of the stator and the rotor tz are the same, and the distance between the axes of the adjacent teeth belonging to different poles is (K + 1 / 2m) tz (K 1, 2, .. .), in the grooves between the elementary prongs 2mq adjacent poles (q 1,2 p), the sensor coils are stacked one at each half of the pole, the coils located at one pole are connected according to the end to the end and form a coil group, coil groups located at the poles with order numbers different by 2m. counting hourly The arrow along the stator bore, are connected in series with the beginning and form branches of the branch with coil groups located at the poles with the order numbers differing by t, are connected in series with the end with the end, and the beginning of the m branches are connected at the connection points. , Which are the beginnings of coil groups located on poles with even and odd numbers, are connected together and the single-phase input terminals of the sensor are made at the connection points, 2. The engine according to claim 1, characterized in that, in order to expand the functionality by providing measurement of the shaft rotational speed, the sensor coils in the elementary grooves are assembled into two m-phase circuits, the windings of each sensor circuit being placed not less than 2 tons neighboring poles. 13 21 25 27 22 24 28 thirty BA 23 29 20 26 #at Rig.2 0С W j2J 22 24 20 M / 0bi 0C / 25   29 25 J / 7 26 ЈЛ2Л 20 C2 Rig.Z 4 5 6 7 8 9 10 11 12 13 w 15