名称：步进电机，使用1-2相励磁1-2相激励功率增倍，步进角度减半，抖动减少，又称4相8拍，数码管显示 03-19速度等级，数字越大，速度越慢-Name: step motor, use 1-2 phase excitation 1-2 phase driving power, doubling the stepping Angle by half, jitter is reduced, also known as the four phase eight clap, digital tube display 03-19th level speed, the greater the number, the slower speed