A high-voltage permanent magnet frequency conversion all-in-one machine

Abstract

The invention discloses a high-voltage permanent magnet frequency conversion integrated machine. The frequency conversion integrated machine includes: a frequency converter, which is used to convert the frequency of high-voltage alternating current and output it, and the output alternating current has at least three circuits; a permanent magnet motor, which is used to receive the alternating current converted by the frequency converter and output, so that driving the motor to run; and a controller configured to control the frequency converter to convert the frequency of the high voltage alternating current and to control the running state of the permanent magnet motor. The frequency converter topology of the present invention adopts multiple outputs, so that the voltage of each output is relatively reduced, thereby reducing the requirement on the rated voltage of the power device. Secondly, the frequency conversion all-in-one machine of the present invention adopts a special energy storage capacitor plug-in method, thereby reducing the volume of the frequency converter. In addition, the permanent magnet motor of the present invention adopts a special winding method in order to connect multiple outputs of the frequency converter.

Description

technical field [0001] The present invention generally relates to the field of motor applications. More specifically, the present invention relates to a high-voltage permanent magnet variable frequency integrated machine. Background technique [0002] At present, when the coal mine is transported by the main conveyor belt, etc., a high-voltage permanent magnet motor of 6 kV to 10 kV is often used as the power source. In the process of using the high-voltage permanent magnet motor, the existing frequency converter cannot directly drive the high-voltage permanent magnet motor, so the working mode of 10kV high-voltage asynchronous motor + controllable start transmission device ("CST")_ is mostly used. However, the motor in this working mode has problems such as difficult maintenance, high maintenance cost, low starting torque under heavy load, and large impact on the power grid. [0003] Secondly, the topology structure of the existing frequency converter mostly adopts the wa...

AI Technical Summary

Problems solved by technology

However, the current topology of this type of inverter is a single-output structure, and the more advanced the topology, the more power devices are required, which leads to the large size of the inverter, high cost and complicated control methods

[0005] In addition, in the process of pre-charging the inverter, the existing technology cannot directly use high-voltage alternating current to charge the energy storage capacitor, usually a low-voltage charging circuit is separately designed for pre-charging, which leads to complex circuits and high costs for the inverter

At the same time, due to the large volume of the energy storage capacitor, and to meet the requirements of high-voltage charging, creepage distance and electrical interval, not only the volume of the inverter is large, but also the energy storage capacitor is likely to be burned.

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