Permanent magnet portal crane frequency converter

Abstract

The invention provides a permanent magnet portal crane frequency converter. The permanent magnet portal crane frequency converter comprises a rectifier bridge, a first filter, a high-frequency direct-current chopper, a secondary rectifier, a second filter and a three-phase switch bridge arm; the input end of the rectifier bridge is connected with external mains supply; the output end of the rectifier bridge is connected with the anode of the first filter; the cathode of the first filter is grounded; the anode of the first filter is connected with an external high-voltage bus and the input endof the high-frequency direct-current chopper; the output end of the high-frequency direct-current chopper is connected with the anode of the secondary rectifier; the cathode of the secondary rectifieris connected with an external low-voltage bus, the anode of the second filter and the input end of the three-phase switch bridge arm; and the output end of the three-phase switch bridge arm is connected with an external low-voltage permanent magnet synchronous motor. By means of the high-frequency direct-current chopper, the influence of pulsating voltage is overcome; a filter capacitor with a small capacitance value can be selected; the area of a high-voltage part in a whole controller is controlled; the miniaturization of the frequency converter is facilitated; overall cost is reduced; andrequirements for application environments are lowered.

Description

technical field [0001] The invention relates to the field of elevator frequency converters, in particular to a permanent magnet door machine frequency converter. Background technique [0002] In the elevator door machine control system, it is necessary to use the frequency converter to control the motor to perform frequent forward and reverse, acceleration and deceleration start and stop movements. [0003] In the inverter circuit topology commonly used in the market, a high-voltage scheme is used to drive a high-voltage motor, such as a 220V motor, but this method requires a larger capacitance value of the filter capacitor in the inverter circuit topology, and The filter capacitor with larger capacitance is more expensive, resulting in higher cost. In addition, due to the high-voltage scheme adopted, the required components also need to withstand high voltage, which leads to higher overall cost and is not suitable for the applied The environmental requirements are also rel...

AI Technical Summary

Problems solved by technology

[0003] In the inverter circuit topology commonly used in the market, a high-voltage scheme is used to drive a high-voltage motor, such as a 220V motor, but this method requires a larger capacitance value of the filter capacitor in the inverter circuit topology, and The filter capacitor with larger capacitance is more expensive, resulting in higher cost. In addition, due to the high-voltage scheme adopted, the required components also need to withstand high voltage, which leads to higher overall cost and is not suitable for the applied The environmental requirements are also relatively high

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