Belt conveyor low frequency direct drive middle-high voltage frequency convertor

Abstract

The invention belongs to the high-voltage frequency convertor technology, and discloses a belt conveyor low frequency direct drive middle-high voltage frequency convertor. The provided belt conveyor low frequency direct drive middle-high voltage frequency convertor is provided with a rectifier transformer; the rectifier transformer is provided with a set of primary windings and 3*j sets of secondary windings; each set of secondary windings are in series connection with a two-quadrant low frequency power unit; the quantity of the two-quadrant low frequency power unit corresponds to the quantityof the secondary windings and is at least 3*1, and three phases of A, B and C are formed; each two-quadrant low frequency power unit is provided with a rectifying unit and a two electrical level IGBT-H type inverter bridge which are installed on the same radiator element surface; the rectifying unit is connected with the three-phase output ends of the secondary windings; the rectifying unit is adiode or a diode-silicon controlled three phase rectifier bridge; a low frequency power unit controller is communicated with a high-voltage frequency changer main control system; according to the middle-high voltage frequency convertor, a reducer and supporting facilities are cancelled, and the requirement of smooth speed regulating of a belt conveyor is met.

Description

Technical field [0001] The invention belongs to the control technology of a high-voltage frequency converter, and proposes a low-frequency direct-drive medium and high-voltage frequency converter for a belt conveyor. Background technique [0002] The belt conveyor is usually driven by a high-speed asynchronous motor or a high-speed DC motor. In order to match the rated operating speed of the belt conveyor, it is usually equipped with a reducer; or, without a reducer, a low-speed AC motor or a low-speed DC The electric motor is directly driven; the existence of the reducer and its supporting facilities increases the overall volume and weight of the equipment, thereby increasing the investment cost including the equipment and its infrastructure, and reduces the transmission efficiency and relatively increases the energy consumption; the DC motor and its The speed control system has a complex structure and high maintenance costs. The motor structure is more complex than AC motors a...

AI Technical Summary

Problems solved by technology

[0002] The belt conveyor is usually driven by a high-speed asynchronous motor or a high-speed DC motor. In order to match the rated operating speed of the belt conveyor, it is usually equipped with a reducer; or, without adding a reducer, it is driven by a low-speed AC motor or a low-speed DC motor. The motor is directly driven; the existence of the reducer and its supporting facilities increases the overall volume and weight of the equipment, thereby increasing the investment cost including the equipment and its infrastructure, and reducing the transmission efficiency, and the energy consumption is relatively increased; the DC motor and its The structure of the speed control system is complex, the maintenance cost is high, the structure of the motor is more complex than that of the AC motor, and the energy consumption is high, so it has been restricted and phased out

At present, low-speed direct-drive belt conveyors are mainly driven by medium and low voltage synchronous machines, using three-level medium and low voltage frequency conversion technology, with a maximum voltage level of 3.3kV, which is inconsistent with the national conditions of my country's industrial field power supply voltage level, which is usually 6kV or 10kV, causing many troubled

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