阅读说明：本技术 一种三相双绕组电机变频一体装置 (Frequency conversion integrated device for three-phase double-winding motor ) 是由 尹彭飞 陈敏 高栋 田玉芳 任成东 于 2020-07-20 设计创作，主要内容包括：一种三相双绕组电机变频一体装置,涉及电力电子功率变换技术领域,解决了结构复杂的问题,包括整流器、直流滤波器、三相双输出变流器和三相双绕组电机,所述的整流器与电网相连接,对电网电流整流为直流电,所述的直流滤波器与整流器相连接,对直流电进行滤波,所述的三相双输出变流器的输入端与直流滤波器相连接,三相双输出变流器包括两组三相输出端,第一组三相输出端与三相双绕组电机的一个绕组相连接,第二组三相输出端与三相双绕组电机的另一个绕组相连接；采用三相双输出变流器方式后减少了三功率开关器件,同时其驱动的是一个三相双绕组的电机,使得电机能更好的发挥其更高的可靠性。(A frequency conversion integrated device of a three-phase double-winding motor relates to the technical field of power electronic power conversion, solves the problem of complex structure, and comprises a rectifier, a direct current filter, a three-phase double-output converter and a three-phase double-winding motor, wherein the rectifier is connected with a power grid and rectifies the current of the power grid into direct current, the direct current filter is connected with the rectifier and filters the direct current, the input end of the three-phase double-output converter is connected with the direct current filter, the three-phase double-output converter comprises two groups of three-phase output ends, the first group of three-phase output ends are connected with one winding of the three-phase double-winding motor, and the second group of three-phase output ends are connected with; three-phase double-output converter mode is adopted, three power switching devices are reduced, and a three-phase double-winding motor is driven, so that the motor can better exert higher reliability.)

1. The utility model provides an integrative device of three-phase duplex winding motor frequency conversion, includes rectifier, direct current filter, three-phase dual output converter and three-phase duplex winding motor, characterized by the rectifier be connected with the electric wire netting, be the direct current to electric wire netting current rectification, direct current filter be connected with the rectifier, carry out the filtering to the direct current, the input of three-phase dual output converter be connected with direct current filter, three-phase dual output converter includes two sets of three-phase output, first group three-phase output is connected with a winding of three-phase duplex winding motor, the three-phase output of second group is connected with another winding of three-phase duplex winding motor.

2. The frequency conversion integrated device of the three-phase double-winding motor as claimed in claim 1, wherein the three-phase double-output converter comprises three parallel converter arms with the same structure, the converter arms comprise three power switches connected in series, three phases of one winding of the three-phase double-winding motor are respectively connected with the upper midpoints of the three converter arms, and three phases of the other winding of the three-phase double-winding motor are respectively connected with the lower midpoints of the three converter arms.

3. The frequency conversion integrated device of the three-phase double-winding motor as claimed in claim 1, wherein the two windings of the three-phase double-winding motor have the same structure and are independent of each other.

Technical Field

The invention relates to a frequency conversion integrated device, in particular to a frequency conversion integrated device of a three-phase double-winding motor.

Background

With the requirement and development requirement of high quality of power supply, a motor system requires high reliability, and is adaptive to the requirements of fault-tolerant operation, high output power and the like, so that the motor with three-phase double windings is widely concerned and valued, however, an inverter generally adopted for controlling the existing three-phase double winding motor generally needs at least 12 switching devices, so that a plurality of power devices are caused, the system cost is increased, meanwhile, the motor and the inverter are separately arranged, a plurality of wires are connected between the inverter and the motor, the wires are long, the system performance is reduced, and if long-distance variable frequency power supply is adopted, the terminal voltage of the motor is overlarge, so that the service life of the motor is greatly influenced.

Disclosure of Invention

In order to solve the problems, the invention provides a frequency conversion integrated device for a three-phase double-winding motor, and provides the frequency conversion integrated device with a simple structure. In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides an integrative device of three-phase duplex winding motor frequency conversion, includes rectifier, direct current filter, three-phase dual output converter and three-phase duplex winding motor, the rectifier be connected with the electric wire netting, be the direct current to electric wire netting current rectification, direct current filter be connected with the rectifier, carry out the filtering to the direct current, the input of three-phase dual output converter be connected with direct current filter, three-phase dual output converter includes two sets of three-phase output, first group three-phase output is connected with a winding of three-phase duplex winding motor, the second group three-phase output is connected with another winding of three-phase duplex winding motor.

Furthermore, the three-phase double-output converter comprises three parallel converter bridge arms with the same structure, the converter bridge arms comprise three power switches connected in series, the three phases of one winding of the three-phase double-winding motor are respectively connected with the upper midpoints of the three converter bridge arms, and the three phases of the other winding of the three-phase double-winding motor are respectively connected with the lower midpoints of the three converter bridge arms.

Furthermore, the two windings of the three-phase double-winding motor have the same structure and are independent from each other.

Compared with the prior art, the invention has the following beneficial effects: based on the fact that a traditional three-phase double-motor driving mode needs twelve switching six-bridge-arm converters to work, three-power switching devices are reduced after a three-phase double-output converter mode is adopted, total loss is reduced, and therefore cost is reduced.

Drawings

The present invention is described in further detail below with reference to the attached drawings.

FIG. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described with reference to fig. 1 and the specific embodiments.

As shown in fig. 1, a frequency conversion integrated device for a three-phase dual-winding motor comprises a rectifier 101, a dc filter 102, a three-phase dual-output converter 103 and a three-phase dual-winding motor 104, the device is connected to an input end A, B, C of the rectifier 101 from a power grid, rectified dc passes through the dc filter 102, the dc filtered dc is connected to the three-phase dual-output converter 103, a first group of three-phase outputs a1, B1 and C1 of the three-phase dual-output converter 103 are connected to input ends a1, B1 and C1 of a first winding of the three-phase dual-winding motor 104, and a second group of three-phase outputs a2, B2 and C2 of the three-phase dual-output converter 103 are connected to input ends a2, B2 and C2 of a second winding of the three-phase.

The three-phase dual-output converter 103 comprises three converter arms connected in parallel, each arm of the three-phase dual-output converter consists of three power switches connected in series, the power switches T1, T4 and T7 are connected in series to form a first converter arm, the power switches T2, T5 and T8 are connected in series to form a second converter arm, the power switches T3, T6 and T9 are connected in series to form a third converter arm, a first phase a1 of a first winding of the three-phase dual-winding motor 104 is connected with a midpoint A1 of the series connection of the T1 and T4 of the first arm of the three-phase dual-output converter 103, a second phase B1 of the first winding of the three-phase dual-winding motor 104 is connected with a midpoint B1 of the series connection of the T2 and T5 of a second arm of the three-phase dual-output converter 103, a third phase C1 of the first winding of the three-phase dual-winding motor 104 is connected with a midpoint C1 of the series connection of the T39, the first phase a2 of the second winding of the three-phase double-winding motor 104 is connected with the midpoint a2 of the series connection of the T4 and the T7 of the first arm of the three-phase double-output converter 103, the second phase B2 of the second winding of the three-phase double-winding motor 104 is connected with the midpoint B2 of the series connection of the T8 and the T5 of the second arm of the three-phase double-output converter 103, and the third phase C2 of the second winding of the three-phase double-winding motor 104 is connected with the midpoint C2 of the series connection of the T9 and the T6 of the third arm of the three-phase double-output converter 103.

Two windings a1, b1 and c1 of the three-phase double-winding motor are independent from a2, b2 and c2, the two groups have the same structure, three phases of each winding are in a star connection mode, and connected star points o1 and o2 are independent from each other.

The technical solutions of the present invention or similar technical solutions designed by those skilled in the art based on the teachings of the technical solutions of the present invention are all within the scope of the present invention.