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在现代电力电子技术发展以前,要求连续调节速度和扭矩的场合几乎被直流电机所独占。近来,交流电机的高效率和低运行费用获得重视。交流电机高效的速度控制需要控制交流电压和频率。对采矿工业有特殊影响的是提升机传动的直接变频器。直接变频器是由恒压恒频电
In the development of modern power electronics technology, the requirements of continuous adjustment of speed and torque of the occasion almost exclusively by the DC motor. Recently, high efficiency and low operating costs of AC motors have gained importance. AC motor speed control and efficient control of AC voltage and frequency. Of particular interest to the mining industry is the direct drive of the hoist drive. Direct drive is constant voltage constant frequency