Discrete variable frequency starting system of AC induction motor and starting method

An induction motor and discrete frequency conversion technology, which is applied to the starter of a single multi-phase induction motor, motor generator/starter, etc., can solve the problem that the three-phase AC induction motor cannot start normally

Inactive Publication Date: 2005-03-23
南通滨睿智能科技有限公司
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Problems solved by technology

The invention can solve the problem that the three-phase AC induct...

Method used

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  • Discrete variable frequency starting system of AC induction motor and starting method
  • Discrete variable frequency starting system of AC induction motor and starting method

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Embodiment Construction

[0005] combine figure 1 , figure 2Describe this embodiment, this embodiment consists of a motor 11, a three-phase current transformer 1, a three-phase parallel thyristor 2, a first operational amplifier 3, a pulse transformer trigger 4, a second operational amplifier 5, a third operational amplifier 6, The microprocessor 7, the liquid crystal display 8, the single-chip computer 9, the keyboard 10 are composed; the three-phase alternating current is respectively connected with the three input terminals of the three-phase parallel thyristor 2 through the three-phase current transformer 1 and respectively connected with the three voltages of the first operational amplifier 3 The detection input terminals are connected, the three output terminals of the three-phase-inverse parallel thyristor 2 are respectively connected to the three input terminals of the motor 11 and are respectively connected to the three voltage detection input terminals of the second operational amplifier 5, ...

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Abstract

A discrete frequency conversion start-up system of the alternating current impression electromotor and its start-up method. It includes mutual inductor, amplifier, crystal brake, processor, liquid crystal screen, chip machine and keyboard. The steps are as follows: program initialization, detect the initial follow current angle, set the trigger angle of the discrete frequency conversion frequency and make the minimal trigger angle larger than initial follow current angle; frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram, frequency division trigger subprogram and flexible start-up subprogram. The invention can make the three-phase alternating current induction motor start up normally when it is heavily loaded and fully loaded.

Description

Technical field: [0001] The invention relates to a discrete frequency conversion starting system for an AC induction motor and a starting method thereof. Background technique: [0002] The existing motor soft starter based on the thyristor voltage regulation principle gradually replaces the traditional step-down starting method. The thyristor voltage regulating circuit is used to control the starting of the three-phase motor, and the input voltage of the motor gradually increases from small to large until it reaches the power supply voltage. The voltage is continuously adjustable and the current is continuous, eliminating the need for hard switches such as contactors and relays, reducing the size of the starting equipment, no special requirements for the motor, low cost, and good controllability. figure 1 The basic structure of the soft starter applied to three-phase motor drive is given. However, a big disadvantage of step-down starting is the drop of starting electromagn...

Claims

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Application Information

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IPC IPC(8): H02P1/30
Inventor 徐殿国赵凯岐王毅
Owner 南通滨睿智能科技有限公司
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