A Soft Starter for Asynchronous Motor and Its Based Predictive Feedback Control Method
An asynchronous motor, soft starter technology, applied in the direction of a single multi-phase induction motor starter, motor generator/starter, etc., can solve the problems of secondary shock, disorder, shock, etc., to improve the disorder and control the speed sensitively , The effect of strong adaptability to working conditions
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Embodiment 1
[0044] like Figure 1-Figure 3 An asynchronous motor soft starter, comprising a three-phase power supply interface, a control power supply circuit, a thyristor conduction angle detection circuit, a synchronous signal acquisition module, a central auxiliary processor, a serial port simulation debugging module, a thyristor drive and a phase-controlled voltage regulation circuit, a voltage Current detection loop, digital-to-analog A / D conversion loop, central host processor, bypass control module, human-computer interaction display module and asynchronous motor interface;
[0045] The central auxiliary processor and the central main processor are connected through the SPI bus;
[0046] The three-phase power interface is connected to the input end of the thyristor drive and the phase-controlled voltage regulation circuit, and the output end of the thyristor drive and the phase-controlled voltage regulation circuit is connected to the asynchronous motor interface;
[0047] The vol...
Embodiment 2
[0060] The predictive feedback control method for an asynchronous motor soft starter described in Embodiment 2 is implemented on the basis of the asynchronous motor soft starter described in Embodiment 1, and includes the following steps:
[0061] Step 1: establishing the asynchronous motor soft starter, connecting the three-phase power supply interface with the three-phase mains electricity, and connecting the asynchronous motor interface with the asynchronous motor;
[0062] Step 2: the thyristor conduction angle detection loop is used to detect the real-time data of the thyristor conduction angle in the thyristor driving and phase-controlled voltage regulation circuit, and generate the real-time data of the thyristor conduction angle;
[0063] The synchronization signal acquisition module is used to detect the zero-crossing moment of the voltage of the three-phase power supply;
[0064] The voltage and current detection loop collects the voltage signal and the current signa...
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