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Current-limiting soft-starting method of asynchronous motor under wideband power supply

A technology for soft starting of asynchronous motors, applied in motor generators/starters, starters of single multi-phase induction motors, etc., which can solve the requirements of soft starting of cooling fan motors and only allow the power frequency to be within a small range Changes and other issues, to achieve the effects of modular design, significant economic and social benefits, and high reliability

Inactive Publication Date: 2010-03-03
CRRC DALIAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the trigger pulses of the three-phase fully-controlled rectification and voltage regulation in the prior art are generated by a phase control chip such as (TC787DS). Since the driving pulse signal is generated by the time proportional integral method, the thyristor soft starter in the prior art is only suitable for 50Hz or 60Hz fixed-frequency power supply only allows the power supply frequency to change within a small range. Since the power generation frequency of the alternator of the diesel locomotive changes with the change of the diesel engine speed, the general diesel engine speed changes from 400r / mim to 1000r / mim, and the alternator The power generation frequency is 40% to 100% of the rated frequency
Under the power supply condition of 40% to 100% rated frequency change, this control method cannot meet the requirements of soft start of the cooling fan motor of diesel locomotive under the condition of variable frequency and variable voltage power supply

Method used

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  • Current-limiting soft-starting method of asynchronous motor under wideband power supply
  • Current-limiting soft-starting method of asynchronous motor under wideband power supply
  • Current-limiting soft-starting method of asynchronous motor under wideband power supply

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Embodiment Construction

[0038] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. See attached image 3, in the three-phase main circuit, a group of anti-parallel thyristors Q1 and Q2, Q3 and Q4, Q5 and Q6 are respectively connected in series, and the bypass contactor MC is connected across the two ends of each group of thyristors.

[0039] See attached Figure 4 , The motor-specific DSPic30f6010A control board used in the control system of the embodiment of the present invention has the characteristics of fast execution speed, strong processing capability, large internal storage space, and rich interfaces. It collects current effective value, motor speed, three-phase voltage Ua, Ub, Uc and other signals, generates each thyristor trigger pulse signal Tr1~Tr6, and drives each thyristor Q1~Q6 through the pulse power amplifier circuit and pulse transformer; generates Do1 signal, through Relay output, control bypass contactor MC.

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Abstract

The invention relates to a current-limiting soft-starting method of an asynchronous motor under wideband power supply; by adopting multi-level frequency-division current-limiting soft starting, according to Ua, Ub and Uc synchronizing signals, the power generating frequency of a power generator and effective value of current, the conducting moment and conducting time of all silicon controlled rectifiers are determined, and when the rotating speed difference of the synchronous rotating speed and practical rotating speed of the motor is no more than the setting value of the rotating speed difference, a bypass contactor of a main loop is closed, and direct driving is carried out. The method has the advantages of simple structure, small volume, light weight, convenient maintenance, good performance, high reliability and good economical efficiency.

Description

technical field [0001] The invention belongs to the technical field of internal combustion locomotives, and in particular relates to a current-limiting soft start method for an asynchronous motor under a broadband power supply. Background technique [0002] In the prior art, the driving methods of the cooling fan of diesel locomotives include hydrostatic transmission, wave-hopping frequency conversion AC drive, pole-changing speed regulation and inverter frequency conversion speed regulation and other methods. [0003] The hydrostatic transmission mode is that the transmission system is connected by the diesel engine through the two cardan shafts to the rear gearbox, the rear gearbox is connected to the hydrostatic pump, and the cooling fan is driven by the hydraulic motor. This cooling fan driving method has the disadvantages of many mechanical failures, a large amount of system maintenance, a large space occupation, high weight, low efficiency, and poor economy. Excessive...

Claims

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Application Information

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IPC IPC(8): H02P1/26
Inventor 张瑞珍蔡志伟
Owner CRRC DALIAN CO LTD
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