CN219576735U

CN219576735U - High-voltage double-speed three-phase asynchronous motor

Info

Publication number: CN219576735U
Application number: CN202223034030.3U
Authority: CN
Inventors: 余海刚; 任庙江; 王晓曼; 章淼芬
Original assignee: Chuangxin Electrical Motor Co ltd Shangyu Of Zhejiang
Current assignee: Chuangxin Electrical Motor Co ltd Shangyu Of Zhejiang
Priority date: 2022-11-16
Filing date: 2022-11-16
Publication date: 2023-08-22
Anticipated expiration: 2032-11-16

Abstract

The utility model discloses a high-voltage double-speed three-phase asynchronous motor, which comprises a stator and a rotor, wherein the stator consists of a machine base and a stator core with windings, the stator core with windings comprises a stator core and stator windings embedded in slots of the stator core, the rotor consists of a rotating shaft and an aluminum casting rotor, the stator windings are a set of windings, are double-layer lap windings, have a winding span of 10, and are connected with 2Y/delta, and the winding span is 10 instead of the conventional 9, because the winding span is 9 and the winding span is 10 pairs of 8-polarity energy influence is very small, the short-distance coefficient of 6 poles can be improved, the comprehensive harmonic content can be further reduced, and the effects of reducing the cost, reducing the electromagnetic noise of the motor, improving the starting and the like are achieved.

Description

High-voltage double-speed three-phase asynchronous motor

Technical Field

The utility model relates to the technical field of motors, in particular to a high-voltage double-speed three-phase asynchronous motor.

Background

The equipment dragged by the motor mainly comprises pumps, fans, compressors and the like, and is one of main power matching equipment in various industries; many mechanical devices adopt the AC motor speed regulation technology, and the pole-changing speed regulation motor adopts the connection method of changing windings to change the pole number and output power of the motor, so that the pole number and output power are matched with the load characteristics of the mechanical devices, the speed change system is simplified, and a large amount of electric energy can be saved. The pole-changing and speed-regulating device comprises a double-winding pole-changing device and a single-winding pole-changing device; each set of windings of the double-winding pole-changing device are independently designed, can be connected according to a common 60-degree phase belt, and are simple in wiring, less in jumper wire and easy to eliminate or reduce harmonic waves; however, as only one set of windings is used at a time, compared with single winding pole changing, the copper consumption of the motor is greatly increased; the single-winding multi-speed asynchronous motor is a motor with only one set of stator windings, and various rotating speeds are obtained through external wiring transformation, but the single-winding pole-changing has the defects of rich harmonic content of the pole number (usually the pole after the pole is changed), large electromagnetic noise, difficult starting and the like.

Disclosure of Invention

The utility model aims to provide a high-voltage double-speed three-phase asynchronous motor so as to overcome the defects in the prior art.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model discloses a high-voltage double-speed three-phase asynchronous motor, which comprises a stator and a rotor, wherein the stator consists of a machine base and a stator core with windings, the stator core with windings comprises a stator core and stator windings embedded in slots of the stator core, the rotor consists of a rotating shaft and a cast aluminum rotor, the stator windings are a set of windings, the windings are double-layer lap windings, the winding span is 10, and the winding connection method is 2Y/delta.

Preferably, the stator winding includes six lead wires, which are a first lead wire, a second lead wire, a third lead wire, a fourth lead wire, a fifth lead wire, and a sixth lead wire, respectively.

Preferably, the U-phase, V-phase and W-phase have two interfaces, which are a first U-phase interface, a second U-phase interface, a first V-phase interface, a second W-phase interface, and a second W-phase interface, respectively, and the first lead wire, the second lead wire, and the third lead wire are connected to the first U-phase interface, the first V-phase interface, and the first W-phase interface, respectively, and the fourth lead wire, the fifth lead wire, and the sixth lead wire are connected to the second U-phase interface, the second W-phase interface, and the second V-phase interface, respectively.

Preferably, the stator winding has a stator slot number of 72.

Preferably, the stator core is formed by laminating high-quality cold-rolled electrical silicon steel sheets with the thickness of 0.5mm, and the cast aluminum rotor is formed by hydraulically casting the high-quality cold-rolled electrical silicon steel sheets with the thickness of 0.5mm and high-temperature melted aluminum into a whole.

The utility model has the beneficial effects that:

(1) The winding span is 10 instead of the conventional 9, because the effects of the winding span of 9 and the winding span of 10 on 8 polarity energy are very little, but the short-distance coefficient of 6 poles can be improved, the comprehensive harmonic content is further reduced, and the effects of reducing the cost, reducing the electromagnetic noise of the motor, improving the starting and the like are further achieved;

(2) By selecting a 2Y/delta winding connection method instead of 2Y/Y, various performance indexes including starting performance of 6 and 8 poles under the single-winding double-speed design characteristics of an 8-pole 60-degree phase belt and a 6-pole 180-degree phase belt are well balanced;

(3) The length of the air gap between the stator and the rotor of the motor is 115% -135% of that of the conventional design, the starting performance of the 6 poles can be improved well, meanwhile, the negative effects on the power factor, the temperature rise and the like of the motor are not obvious, meanwhile, the rotor and the stator of the operation towel are easy to rub due to the fact that the air gap is too small, the phenomenon of sweeping the bore occurs, difficulty is brought to starting, and therefore the reliability of operation is reduced.

The features and advantages of the present utility model will be described in detail by way of example with reference to the accompanying drawings.

Drawings

FIG. 1 is a prior art 6/8 pole single winding two speed wiring schematic;

FIG. 2 is a schematic illustration of a 6/8 pole single winding two speed wiring of the present utility model;

FIG. 3 is a schematic diagram of a prior art 6/8 pole single winding two speed conductor number assignment wiring scheme;

FIG. 4 is a schematic diagram of a 6/8 pole single winding two speed conductor number assignment wiring scheme of the present utility model;

FIG. 5 is a schematic diagram of a prior art 6/8 pole single winding two speed motor power connection scheme;

FIG. 6 is a schematic diagram of a power supply wiring scheme for a 6/8 pole single winding two speed motor of the present utility model;

FIG. 7 is a schematic diagram of a 6/8 pole single winding two speed U-phase junction of the present utility model;

FIG. 8 is a schematic diagram of a 6/8 pole single winding two speed V phase connection of the present utility model;

FIG. 9 is a schematic diagram of a 6/8 pole single winding two speed W phase connection of the present utility model;

FIG. 10 is a schematic illustration of a 6/8 pole single winding two speed internal wiring of the present utility model;

in the figure: 1-first lead, 2-second lead, 3-third lead, 4-fourth lead, 5-fifth lead, 6-sixth lead, 7-U interface I, 8-U interface II, 9-V interface I, 10-V interface II, 11-W interface I, 12-W interface II.

Detailed Description

The present utility model will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the detailed description and specific examples, while indicating the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.

Referring to fig. 1, a 6/8 pole identical turning scheme of the prior art, winding span y=9, is 1 example of the prior art, and similar variations may occur in production practice. In the prior art, a reverse wiring scheme is also adopted, and partial coils must be split to obtain symmetrical three-phase windings, so that the method is difficult to manufacture, easy to error and complex in production process and is gradually eliminated.

Referring to fig. 3, the arrow indicates the positive direction of current in the corresponding slot number conductors for the stator winding at high speed (6 poles).

Referring to fig. 2, the embodiment of the utility model provides a high-voltage double-speed three-phase asynchronous motor, which comprises a stator and a rotor, wherein the stator consists of a base and a stator core with windings, the stator core with windings comprises a stator core and stator windings embedded in slots of the stator core with windings, the rotor consists of a rotating shaft and a cast aluminum rotor, the 8 pole is a 60-degree phase belt normal winding, and the 6 pole is a reverse turn 180-degree denormal winding.

Referring to fig. 4, the arrow in fig. 4 indicates the positive direction of current in the corresponding slot number conductors for the stator winding at high speed (6 poles). Compared with the same-steering layout scheme in the prior art, the reverse-steering 6-level wiring layout scheme can greatly reduce the content of higher harmonics. Y=10 winding spans are chosen instead of the conventional y=9 because y=9 and y=10 have little effect on 8 polarity energy, but can increase the 6 pole short-range coefficient (from 0.924 at y=9 to 0.966 at y=10) and attenuate 6 pole v=5, 7 harmonics, harmonic content contrast table below:

it can be seen that the comprehensive harmonic content of the winding wiring layout scheme of the utility model is minimal.

The utility model selects 2Y/delta winding connection instead of 2Y/Y, because 8 poles are 60-degree phase band windings, the winding distribution coefficient is higher (0.9598), and 6 poles are 180-degree denormal windings, the winding distribution coefficient is lower (0.6384), if 2Y/Y connection is adopted, the starting performance meeting the requirements cannot be achieved under the two pole numbers of 6 and 8 poles, for example: when the starting performance of the 6-pole motor meets the requirement, the starting moment of the 8 poles cannot meet the normal starting requirement of the motor; when the starting performance of the designed 8-pole motor meets the requirement, the starting current multiple of the 6 poles can be seriously out of standard, the impact on the power grid is large during starting, and a large potential safety hazard exists. By selecting winding connection 2Y/delta, various performance indexes of 6 and 8 poles including starting performance under the single winding double-speed design characteristics based on an 8-pole 60-degree phase band and a 6-pole 180-degree phase band are well balanced.

Referring to fig. 5-9, in view of the fact that 6 and 8 are very reverse, the motor requires the same direction in both poles when in actual use, when the first lead wire 1, the second lead wire 2, the third lead wire 3, the fourth lead wire 4, the fifth lead wire 5 and the sixth lead wire 6 are connected to the terminal post of the junction box, the first lead wire 1, the second lead wire 2 and the third lead wire 3 are connected to the first U-phase interface 7, the first V-phase interface 9 and the first W-phase interface 11 respectively, and the fourth lead wire 4, the fifth lead wire 5 and the sixth lead wire 6 are connected to the second U-phase interface 8, the second W-phase interface 12 and the second V-phase interface 10 respectively (see fig. 6), instead of the conventional second U-phase interface 8, the second V-phase interface 10 and the second W-phase interface 12 (see fig. 5).

The arrangement wiring connection schemes of the windings of the U phase, the V phase and the W phase are shown in fig. 7, 8 and 9, so that the problems are simplified and clear and the operation is easy when the U phase, the V phase and the W phase are listed independently.

Furthermore, although the 6-pole comprehensive harmonic wave is lower, compared with the harmonic wave of the winding of the single-speed three-phase asynchronous motor with a normal 60-degree phase band, the harmonic wave still has higher frequency, so that torque recess is generated in the starting process of the motor, and the motor can be crawled at a low speed and cannot be started normally under severe conditions, so that the influence of the harmonic wave is effectively weakened, and the length of an air gap between a stator and a rotor of the motor is 115% -135% of that of the conventional design;

the air gap of the general small-sized asynchronous motor is 0.25-1.5 mm, the air gap of the medium-sized asynchronous motor is 0.75-2 mm, the size of the air gap has larger influence on the performance and the operation reliability of the asynchronous motor, meanwhile, the rotor and the stator of the operation towel are easy to rub due to the fact that the air gap is too small, the phenomenon of 'sweeping' occurs, difficulty is brought to starting, and the operation reliability is reduced;

the practice proves that the 6-pole starting performance can be better improved by properly increasing the air gap length (the air gap length is too small to improve the starting performance and too large to negatively influence the load performance), and meanwhile, the negative influence on the power factor, the temperature rise and the like of the motor is not obvious.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the utility model.

Claims

1. The utility model provides a high-voltage double-speed three-phase asynchronous motor, includes stator and rotor, wherein the stator comprises frame and winding stator core, there is winding stator core to include stator core and inlay three stator winding in its groove, be U phase, V phase, W phase respectively, the rotor comprises pivot and cast aluminium rotor, stator winding is one set of winding, is double-deck lap winding, its characterized in that: the winding span of the stator winding is 10, and the winding connection method of the stator winding adopts a 2Y/delta method.

2. A high voltage two speed three phase asynchronous motor as claimed in claim 1 wherein: the stator winding comprises six outgoing lines, namely a first outgoing line, a second outgoing line, a third outgoing line, a fourth outgoing line, a fifth outgoing line and a sixth outgoing line.

3. A high voltage two speed three phase asynchronous motor as claimed in claim 2 wherein: the U-phase, the V-phase and the W-phase are respectively provided with two interfaces, namely a first U-phase interface, a second U-phase interface, a first V-phase interface, a second W-phase interface, a first lead wire, a second lead wire and a third lead wire, respectively connected with the first U-phase interface, the first V-phase interface and the first W-phase interface, and a fourth lead wire, a fifth lead wire and a sixth lead wire, respectively connected with the second U-phase interface, the second W-phase interface and the second V-phase interface.

4. A high voltage two speed three phase asynchronous motor as claimed in claim 1 wherein: the stator winding has a stator slot count of 72.

5. A high voltage two speed three phase asynchronous motor as claimed in claim 1 wherein: the stator core is formed by laminating high-quality cold-rolled electrical silicon steel sheets with the thickness of 0.5mm, and the cast aluminum rotor is formed by hydraulically casting the high-quality cold-rolled electrical silicon steel sheets with the thickness of 0.5mm and high-temperature melted aluminum into a whole.