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煤矿井下应用防爆变极双速电动机取代传统的单速电动机及液力联轴器驱动刮板输送机,在我国是近几年来开发应用的一种新技术。主要优点是能较好地解决刮板输送机起动困难问题以及由于工作面落煤过多压住刮板输送机(俗称压溜子)而烧坏驱动电机。其次是取消了液力联轴器,消除了着火的隐患。再者是缩小了机头部尺寸,提高了链速,增加了运输量。因此受到煤炭生产企业的普遍欢迎。煤矿电机行业立足于国内市场,依靠自己的技术力量,自行开发了一系列矿用隔爆型变极双速电动机。应用于生产实践,促进了煤炭的生产和技术的进步,取得了较好的效益。一、矿用隔爆型变极双速电动机的变极原理煤矿井下驱动刮板输送机的电动机通常是鼠笼型异步电动机。通过变换定子绕组的极对数而获得两种及两种以上不同的转速的方法是最简单最常用的方法。这里,有两种基本的情况。1.单绕组变极法即是在定子槽中安置一套绕组(单绕组),把各个极相组的连接线引至接线盒,通过改变连接线的不同组合,形成不同极对数的磁场,从而获得两种或两种以上不同的转速。这种变极电动机称为单绕组变极电动机。在我国早巳得到开发应用。
Application of explosion-proof dual-speed explosion-proof coal mine underground motor to replace the traditional single-speed motor and hydraulic coupling drive scraper conveyor, in our country in recent years, development and application of a new technology. The main advantage is that it can better solve the problem of difficult start of scraper conveyor and burn the drive motor because of the excessive falling of coal on the scraper conveyor. Followed by the abolition of the hydraulic coupling, eliminating the hidden danger of fire. Another is to reduce the size of the nose, increased chain speed, increased traffic. Therefore by the coal production enterprises generally welcomed. Coal mine electrical industry based on the domestic market, relying on their own technical strength, developed a series of mine explosion-proof variable pole two-speed motor. Applied to the production practice, promoted the production of coal and the progress of technology, and achieved good benefits. First, mine explosion-proof variable pole two-speed motor pole principle Coal mine drive scraper conveyor motor is usually a squirrel cage asynchronous motor. It is the simplest and most common method to obtain two or more different rotational speeds by changing the pole pairs of the stator windings. Here are two basic situations. 1. Single-winding variable pole method that is placed in the stator slot set of windings (single winding), the poles of the lead group leads to the junction box, by changing the different combinations of connecting lines to form a different number of magnetic pole pairs , Resulting in two or more different speeds. This variable pole motor is called a single winding pole-changing motor. Has already been developed and applied in our country.