High-voltage permanent magnet variable frequency motor all-in-one machine based on low-voltage module series connection

Abstract

The invention discloses a high-voltage permanent magnet variable frequency motor all-in-one machine based on low-voltage module series connection. The all-in-one machine comprises a permanent magnet synchronous motor, wherein a frequency converter connected through a flange is arranged above the permanent magnet synchronous motor; the frequency converter is integrally internally provided with a plurality of cavities; the cavities comprise power supply wiring cavities and input electric reactor wiring cavities; a main control unit, a rectifier device, a capacitor energy storage module and an inverter power unit which can realize vector control of the permanent magnet synchronous motor are contained inside each cavity; the permanent magnet synchronous motor is a permanent magnet synchronousmotor provided with multiphase independent coil windings. According to the all-in-one machine, heat dissipation is carried out by using a water-cooling radiator, and a water cooling plate of the radiator is made from a novel insulating heat conduction material. The all-in-one machine has the beneficial effects of simple structure and high practicability.

Description

technical field [0001] The invention relates to the field of electric drive, in particular to a high-voltage permanent magnet variable-frequency motor integrated machine based on low-voltage modules connected in series. Background technique [0002] At present, high-voltage inverters generally adopt cascaded multi-level technology, and the structure mainly includes starter cabinets, phase-shifting transformers, power unit cabinets, and controllers. Although the high-voltage frequency converter with this structure has certain advantages in performance, it is limited by its large size and low protection level. This type of high-voltage frequency converter does not meet the coal safety and explosion-proof requirements, and cannot be used in underground coal mine operations. So far, the mature products of high-voltage inverters used in coal mines are only 3300V voltage level, and the traditional unit series method cannot realize the frequency conversion drag application of 6kV o...

AI Technical Summary

Problems solved by technology

Although the high-voltage frequency converter with this structure has certain advantages in performance, it is limited by its large size and low protection level. This type of high-voltage frequency converter does not meet the coal safety and explosion-proof requirements, and cannot be used in underground coal mine operations.

So far, the mature products of high-voltage frequency converters used in coal mines are only 3300V voltage level, and the traditional unit series method cannot realize the frequency conversion drag application of 6kV or 10kV high-voltage level

[0003] The inverter part of the existing frequency converter generally adopts the traditional two-level or three-level topology with a slightly complicated structure. Although the two-level and three-level main circuit topology is simple, the power components used in the inverter unit can withstand voltage The requirements are high. At present, the highest withstand voltage of IGBTs in the world is 6500V. Compared with low-voltage IGBT power modules, high-voltage IGBTs are expensive and the market supply is insufficient. They mainly rely on imports and need to be filed in the actual application process. Many inconveniences limit the practical application of this power module, so the traditional two-level or three-level structure cannot be applied to 6kV or 10kV inverters

If the multi-level output topology is adopted, not only the main circuit structure is complex and the hardware is difficult to implement, but also the software programming is difficult, the control performance is reduced, and the performance requirements of the ordinary three-phase input motor itself are high.

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