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High torque soft starter with graded AC-AC frequency conversion method

A soft starter, alternating frequency technology, applied in the field of high torque soft starter, can solve problems such as uneconomical and high price, and achieve the effect of increasing cost expenditure, strong control function and stable operation

Inactive Publication Date: 2006-07-26
徐甫荣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its high price, it is very uneconomical to use a frequency converter to achieve soft start for equipment that does not require speed regulation and is just to solve the starting problem, and it is also unaffordable for general industrial enterprises.

Method used

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  • High torque soft starter with graded AC-AC frequency conversion method
  • High torque soft starter with graded AC-AC frequency conversion method
  • High torque soft starter with graded AC-AC frequency conversion method

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Embodiment Construction

[0034] In order to improve the starting torque of the electronic soft starter and reduce the starting current, the present invention adopts a graded AC-AC frequency conversion method, utilizes the hardware structure of the original soft starter, and cleverly controls the triggering sequence of the three-phase thyristors to change the While changing the voltage, the frequency of the alternating current is also changed, realizing a high-torque V / F controlled soft start. Frequency classification upgrade: from f / 16→f / 13→f / 10→f / 7→f / 4→f / 3→f / 2→f(50HZ)→grid-connected operation. It realizes the real smooth up-frequency soft start, increases the starting torque, reduces the starting current, and is more suitable for loads requiring heavy-duty starting.

[0035] (1) The principle of sine wave frequency division:

[0036] To convert three-phase sinusoidal alternating current into AC-AC frequency, only 1 / n frequency division can be realized, such as f / 2, f / 3...f / n. The method is to contr...

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Abstract

This invention relates to class alternating frequency high torque flexible starting device, which can reduce current and improve starting torque to realize real flexible parking and motor short working low speed operation and braking status. This invention alters voltage frequency in the starting process and adopts the variable frequency method to realize slide lift flexible starting and adopts semi-wave variable frequency and adopts three-phase trigger impulse control circuit to generate three-phase modulation impulse signals.

Description

1. Technical field: [0001] The invention relates to a high-torque soft starter adopting a graded AC-AC frequency conversion method, which can make a motor start smoothly with high starting torque and small starting current. 2. Background technology: [0002] AC asynchronous motors have been widely used in various fields of the national economy because of their simple structure, high operating reliability, strong environmental adaptability and excellent drag performance, but their fatal disadvantages are large starting shocks, which will Adverse effects on the power grid and equipment. In order to solve the starting problem, people have adopted many methods for a long time: star / delta conversion starting, autotransformer step-down starting, saturated reactor and switching transformer step-down starting, and water resistor step-down starting. In the 1970s, thyristor phase-shift trigger step-down soft starters were used, that is, the electronic soft starters currently on the m...

Claims

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Application Information

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IPC IPC(8): H02P1/30
Inventor 徐甫荣
Owner 徐甫荣
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