Main circuit structure of 1140V permanent magnet direct drive inverter-fed motor integrated machine

Abstract

The invention provides a main circuit structure of a 1140V permanent magnet direct drive inverter-fed motor integrated machine, comprising a pre-charging unit (2), a rectifying unit (3), a filtering unit (5), an inverter unit (6) and a motor unit (12). The pre-charging unit (2) is formed by connecting a common diode module and a resistor in series; the rectifying unit (3) is a three-phase half-controlled bridge rectifier; the filtering unit (5) is a voltage source type capacitor energy storage filtering; the inverter unit (6) is a multi-groups of two-level topology series structure; the motorunit is a multi-phase permanent magnet direct drive synchronous motor (12); and the above units are connected by a copper busbar or a laminated busbar. According to the main circuit structure of permanent magnet inverter-fed motor integrated machine adopted in the invention has smaller volume and simpler structure, and the part of motor is a permanent magnet direct drive synchronous motor, which has larger starting torque, better energy saving and effect of environmental protection, and superior performance.

Description

technical field [0001] The invention relates to an explosion-proof frequency conversion motor integrated machine for mining, in particular to a main circuit structure of a 1140V permanent magnet direct drive frequency conversion motor integrated machine. Background technique [0002] At present, the application of permanent magnet variable frequency motor integrated machine is still very rare. The equipment used is basically used separately from the inverter and the motor, which requires a large amount of installation space. At the same time, most inverters are installed far away from the motor. It is more complicated, and the longer cable increases the installation cost and generates more interference, which increases du / dt, affects the drive performance of the inverter, and also affects the insulation performance of the motor, reducing the service life of the motor. [0003] In the past, asynchronous motors were mostly used in underground mines and other applications, but ...

AI Technical Summary

Problems solved by technology

[0004] The frequency conversion motor integrated machine has not been widely used. Most of the integrated machines seen on the market are large in size and complex in structure. Most of the motor parts of the integrated machine are asynchronous motor structures. The world urgently hopes for the appearance of a permanent magnet frequency conversion motor integrated machine with small size, simple structure and superior performance.

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