CN2124524U

CN2124524U - Variable pole windings for rotor with multiplex pole ratio

Info

Publication number: CN2124524U
Application number: CN 92212670
Authority: CN
Inventors: 黄守道; 汤松青; 夏晓华
Original assignee: HUNAN MOTOR FACTORY
Current assignee: HUNAN MOTOR FACTORY
Priority date: 1992-04-18
Filing date: 1992-04-18
Publication date: 1992-12-09

Abstract

The utility model relates to a pole changing winding for an asynchronous electric motor, more specifically a simplex winding pole changing winding for a pole changing rotor with a multiplex pole ratio. The utility model is characterized in that when the rotor simplex winding is pole changing and the multipolar (slow run), the windings are connected into a 60 DEG phase belt and four paths of three-phase windings which are in star-shaped (4Y) symmetry, and three lead-out lines are connected with a set of bus rings (three pieces). When the rotor simplex winding has fewer poles (high rate), a short circuit automatically occurs in the winding to form a 30 DEG phase belt and one path of symmetrical six-phase winding in star-shaped (1Y) connection. The winding of the utility model can not only be used for manufacturing the double speed wound rotor motors, and can also be matched with another set of windings with other number of poles or another set of the utility model to design a three-speed or quad-speed electric motor.

Description

Variable pole windings for rotor with multiplex pole ratio

The utility model relates to a kind of variable-pole winding of asynchronous motor, specifically is meant a kind of multipole proportion pole-changing-rotor winding of simplex winding.

In recent years, rising of occurring reused the wound rotor double speed three phase asynchronous motor, and (patent announcement number is: 2033167U) its rotor loop can be by collector ring crosstalk resistance, to improve the startability of motor, and adjustable speed within the specific limits, but this motor will and increase a cavity with two cover collector rings (six), make its complex structure, heaviness, make troubles for manufacturing and use.

The purpose of this utility model is to provide a kind of motor of multipole proportion pole-changing-rotor winding, and its winding construction is simple, and rotor is only with a cover collector ring (three).Its speed adjustable range is wide, and startability is good, can dwindle the volume of the reduction box of matched host machine, alleviates its weight, saves the operating efficiency of electric energy, raising lifting equipment.

The utility model is in the basic serial lifting of YZR and metallurgical with a kind of innovation on the basis of wound rotor three-phase asynchronous motor, promptly adopt only to change the motor stator winding connection method, the rotor winding only connects a cover collector ring (three) and realizes the pole changing of two kinds of numbers of poles.Its design is: stator adopts the common multipole proportion variable-pole winding of a cover, rotor adopts this programme pole-changing-rotor winding, with multipole be the basic utmost point, its three lead-out wires connect three collector rings respectively, when need low speed (multipole) moves, can in rotor loop, the crosstalk resistance start and speed governing by collector ring, when needs (lack the utmost point) when moving at a high speed, can pass through low rate start earlier, change top gear then into, also can directly start, at this moment by top gear, because rotor loop short circuit voluntarily can not be by collector ring crosstalk resistance in rotor loop.So its startability is relatively poor.(that is: starting current is big, staring torque is little), in order to address this problem, improve the method for startability with reference to two cage-type rotor motor, original same layer line circle is divided into has the identical number of turn more than two-layer or two-layer, shape, the coil that size and line footpath is different, embedding is arranged successively, line footpath is maximum is embedded in bottom land, line footpath is the thinnest is embedded in notch, needn't separate with insulating material between each layer line circle, but should be well arranged, try not to intersect, as shown in Figure 1, the head of layering coil, tail is connected with each other respectively at portion's end, like this, for top gear (minority shelves), rotor is equivalent to two cages or many cage-type rotors, when starting and gear shift (changing top gear into by low or first gear), owing to squeeze the effect of stream effect, can reduce starting current, improve staring torque, thereby improved startability.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is the schematic cross-section that is embedded with the rotor of winding;

Fig. 2 presses the arrangement winding connection schematic diagram of table 1 for embodiment;

Fig. 3 is the utility model Q ₂=24 grooves, winding launches schematic diagram during the 2P=4/2 utmost point;

Fig. 4 is the utility model Q ₂=48 grooves, winding launches schematic diagram during the 2P=8/4 utmost point;

Fig. 5 is the utility model Q ₂=72 grooves, winding launches schematic diagram during the 2P=12/6 utmost point;

Fig. 6 is the winding expansion schematic diagram of Fig. 4 with two layer winding.

Institute's column of figure is coil number (groove number) among the above-mentioned figure.

Embodiment: work with YZRD 225N-8/4 22/22KW that to reuse the wound rotor double speed three phase asynchronous motor be that example is illustrated.

Pole-changing principle of the present utility model:

Count Q with rotor ₂Be 48 grooves, the former 60 ° of facies tracts of three-phase that are designed to of rotor winding, pitch 1-6, four tunnel stars (4Y) connection: individual layer chain type winding, now still make 8 very former design forms, 8 very on the basis of 60 ° of facies tracts of three-phase, again whole coil grooves number are divided into 6 phases by 4 utmost points, the phase bandwidth is 30 °, its arrange with 8 extremely with listing in tables 1.

Referring to Fig. 2, for 8 utmost points, every phase winding can be divided into 4 parts, each part is in series by two coil groups, connection is 4Y, and rotor current must constitute the loop by outer meeting resistance, and the table of comparisons 1 can find that 8 utmost points belong to the coil groups of homophase: 1-2～25-26 originally; 7-8～31-32; 13-14～37-38; 19-20～43-44; When 4 utmost points, phase place is respectively 0 °, and 90 °, 180 °, 270 °, (phase place of establishing coil groups 1-2～25-26 is 0 ° of electrical degree), wherein

Table 1

Table 2

Coil groups 1-2～25-26 and 13-14～37-38,7-8～31-32 and 19-20～43-44 just are being anti-phase, be in respectively from short-circuit condition, all winding constitutes 4 utmost points, 1Y connection 6 phases from short-circuited winding, adjacent two phase windings differ 30 ° of electrical degrees arbitrarily, and this winding coefficient is 0.966/0.701.

Model machine is through overtesting and actual motion, prove its function admirable, wherein every technical performance parameter of motor meets the requirement of YZR 225N-8 22KW motor substantially during 8 utmost points, and the technical performance data of two model machines see Table 2(work and are made as S3-40%, phase 10min weekly).

Equally, every extremely every phase groove is counted rotor individual layer and the two layer winding that q is an integer, can be designed to multipole proportion pole-changing-rotor winding of the present utility model, shown in Fig. 3,4,5, connection is 4Y during the many most utmost points, 60 ° of facies tracts of 3 phases, connection is 1Y, 6 30 ° of facies tracts mutually during the minority utmost point, and is in from short-circuit condition.

Fig. 6 launches schematic diagram for Fig. 4 adopts the winding of two layer winding, and other each examples all can adopt two layer winding.

The utility model is owing to only adopt three collector rings, when the need low cruise, can start and speed governing by collector ring crosstalk resistance in rotor loop, when the need high-speed cruising, can start by low or first gear earlier, and then change to top gear, also directly high-speed starting (rotor loop is short circuit voluntarily), adopt the motor of the utility model design to have simple in structure, control is convenient, speed adjustable range is wide, the advantage that startability is good, be specially adapted to the Electric Drive of the hoisting equipment of constant power load, adopt winding of the present utility model not only can design two-speed motor, can be designed to three fast wound rotor three-phase asynchronous motors if join the winding of another set of other utmost points again, also can be designed to four fast wound rotor three-phase asynchronous motors with two covers pole-changing-rotor winding of the present utility model.

Claims

1, a kind of multipole proportion pole-changing-rotor winding, it is characterized in that, the rotor single-winding pole-changing, winding is unified into 60 ° of facies tracts when multipole (low speed), three phase windings of four tunnel stars (4Y) symmetry, three lead-out wires connect a cover collector ring (three), winding inside short circuit voluntarily when lacking the utmost point (at a high speed) forms 30 ° of facies tracts, six phase windings of the symmetry that one tunnel star (1Y) connects.

2, a kind of multipole proportion pole-changing-rotor winding according to claim 1, it is characterized in that, it is measure-alike and coil, lines footpaths that the line footpath is different are the thickest is embedded in bottom land that winding can be divided into the two-layer or two-layer above number of turn, shape, length, embedding is arranged successively, line footpath is the thinnest is embedded in notch, each layer line circle parallel with one another respectively in the end end to end.

3, described a kind of multipole proportion pole-changing-rotor winding arranged according to claim 1 or 2, it is characterized in that every extremely every phase groove counts individual layer and the two layer winding that q is an integer;

4, according to claim 1 or 2 or 3 described a kind of multipole proportion pole-changing-rotor windings, it is characterized in that the motor rotor winding only has three lead-out wires, promptly adopt three collector rings, when the need low cruise, can start and speed governing by collector ring crosstalk resistance in rotor loop, when the need high-speed cruising, can start by low or first gear earlier, and then change to top gear also directly high-speed starting (rotor loop is short circuit voluntarily);

5, according to claim 1 or 2 or 3 or 4 described a kind of multipole proportion pole-changing-rotor windings, it is characterized in that winding can be divided into the rotor winding of the wound rotor three-phase asynchronous motor of double speed, three speed, four speed.