直流电动机调速是指电动机在一定负载的条件下，根据需要，人为地改变电动机的转速。直流电动机调速调速性能好。所谓“调速性能”，是指电动机在一定负载的条件下，根据需要，人为地改变电动机的转速。直流电动机可以在重负载条件下，实现均匀、平滑的无级调速，而且调速范围较宽。(DC motor speed regulation refers to the fact that, under certain load conditions, the motor changes the motor speed artificially. DC motor speed control performance. The so-called "speed control performance" refers to the motor under certain load conditions, according to need, artificially change the speed of the motor. DC motors can achieve uniform and smooth stepless speed regulation under heavy load conditions, and have a wide range of speed regulation.)