直驱式电动台钻用开关磁阻电机高效控制

直驱式电动台钻用效率较高的开关磁阻电机(SRM)替换单相感应电机,将钻头直接固定到电机转子的输出端,省去传统台钻的皮带、塔轮等机械传动装置,实现直接驱动。为了实现直驱式电动台钻全转速范围内的无极调速功能,提出起动阶段采用电流斩波控制(CCC)提供大扭矩；低速阶段采用基于正余弦电流分配的方法抑制低速转矩脉动；中高速阶段采用电压斩波控制(CVC)+角度控制(APC)的变角度电压斩波组合控制方式对转速进行调节。从而实现了不同控制模式间的平滑切换的控制策略。试验结果表明:所提出的全转速范围的控制策略效率高、调速性能好,可有效提高电动台钻的性能。

High Efficiency Control of Switched Reluctance Motor forDirect Drive Electric Bench Drill

Single phase induction motor was replaced by high efficiency switched reluctance motor (SRM) in direct drive electric bench drill. The drill bit was directly fixed to the output end of the motor rotor. The belt, tower wheel and other mechanical transmission devices of traditional bench drill were omitted,and the direct drive was achieved. In order to realize the stepless speed regulation of the direct drive type electric bench drill in the full speed range, the control strategies were proposed as follows: in the starting phase, chopped current control (CCC) was used to provide high torque; in the low speed phase, a method based on sine and cosine current distribution was proposed to suppress low speed torque ripple; in the middle and high speed stage, the variable angle voltage chopping combination control method of chopped voltage control (CVC) + angle position control (APC) was used to adjust the speed and achieve smooth switching between different control modes. The experimental results showed that the proposed full speed range control strategy had high efficiency and good speed regulation performance, which could effectively improve the performance of the electric bench drill.