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Low-voltage low-frequency transformer of high-voltage wound asynchronous motor for drining mine hoister

A technology for asynchronous motors and mine hoists, which is applied in the control of motor speed or torque, motor generator control, AC motor control, etc. It can solve problems such as braking capacity limitations, shorten the transformation cycle, and reduce costs , good effect of control characteristics

Inactive Publication Date: 2005-07-20
ZHONGYUAN ENGINEERING COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the output of this device is alternating current in the high-speed braking area, it is limited by the output voltage of the inverter and the power limit of the parallel connection of the braking unit DB1 to the resistance R, so the braking ability in the high-speed area is greatly limited.

Method used

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  • Low-voltage low-frequency transformer of high-voltage wound asynchronous motor for drining mine hoister
  • Low-voltage low-frequency transformer of high-voltage wound asynchronous motor for drining mine hoister
  • Low-voltage low-frequency transformer of high-voltage wound asynchronous motor for drining mine hoister

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Embodiment Construction

[0031] see figure 1 , figure 1 It is a block diagram of a low-voltage low-frequency frequency converter system for driving a high-voltage winding asynchronous motor of a mine hoist according to the present invention. The mine hoist system of the present invention has DC high-torque braking and low-frequency vector control and high-torque crawling links. The system consists of a High-voltage wound asynchronous motor 1 (model YR800-12 / 1430), load resistor 2, high-voltage power frequency AC power grid 3, high-voltage switching high-voltage switch 4, high-voltage intermittent switching switch 5, and low-voltage low-frequency inverter 7 for control. Take a mine whose depth is 368 meters in a coal mine as an example. K4 type coal feeder and hydraulic tension type steel wire rope tank road are selected, and the skip is a standard bucket of 12t. The original NC thyristor AC-DC-AC frequency conversion speed regulation is changed to a new low-voltage low-frequency DC braking and low...

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Abstract

The invention relates to a low voltage low frequency transducer that is used to drive mine winder high voltage winding asynchronous motor. It comprises rectification circuit, inverter circuit, and frequency transducer control unit. The control system of the invention is in the transducer and the output voltage is especial PWM low DC voltage and low voltage low frequency PWM AC. It adopts discontinuity switching operation mode and only connects to the high voltage winding asynchronous motor to drive the motor directly by high voltage switch when the motor is in retarding braking stage and retarding crawling stage. The invention has the advantage of great DC dynamic brake moment and low frequency crawling dynamic moment, as well as low cost.

Description

technical field [0001] The invention relates to a low-voltage low-frequency frequency converter directly driving a high-voltage winding asynchronous motor of a mine hoist, in particular to a frequency converter that is put into operation only when the high-voltage winding asynchronous motor of the mine hoist is in the deceleration and braking state , the frequency converter directly drives the high-voltage wound asynchronous motor of the mine hoist to run in a low-frequency crawling working state. Background technique [0002] At present, in domestic coal mines, most mine hoist systems use high-voltage wound asynchronous motors as the main drive motor. Using high-voltage wound motor rotor series and parallel resistors to control the start-up and speed regulation process of the motor is a traditional control method for controlling the deceleration stage and low-frequency crawling stage of the high-voltage wound motor. Further explanation is made below in conjunction with acc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P27/08
Inventor 王晓雷陈旭李宪普付邦胜
Owner ZHONGYUAN ENGINEERING COLLEGE
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