A03B-0808-C001
A03B-0808-C001
A03B-0808-C001
传统的鼠笼式异步电动机起、制动控制方式一般有四种，即定子回路串电阻起动，Y/△起动，自耦变压器起动和延边三角形起动;制动方式有三种，反接制动，能耗制动和电容制动，其中任何一种起，、制动控制方式的实现通常由继电器-接触器控制系统来完成。下面就以定子回路串电阻降压起动和反接制动为例，分析由继电器-接触器实现的鼠笼式异步电动机的起、制动控制。如图1所示，此控制电路含三个接触器和一个中间继电器线圈，12个触点。起动时，KM2、KM3线圈均处于断开状态，按下起动按钮SB1，KM1线圈通电并自锁，电动机串电阻减压起动。当电动机转速上升到某一定值时(此值为速度继电器KS1的整定值，可调节，如调至100r/min时动作)，速度继电器KS1的常开触点闭和，中间继电器KA通电并自锁，KA的常开触点接通接触器线圈KM3，KM3的主触点在主电路中短接定子电阻R，电动机转速上升至给定值时投入稳定运行。制动时，按下停机按钮SB2，KM1线圈断电，其主触点断开三相电源;控制电路中常开触点断开，KM3失电，限流电阻串入;常闭触点闭合，接通反接制动接触器KM2，对调两相电源相序，电动机处于反接制动状态。当转速下降至某一定值时(比如100r/min),KS1常开触点断开KA，继而断开KM2，电动机失电，迅速停机。
备货，备货，降降降，火火火，火火火……
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