有级调速 meaning in English

step speed regulation

Custom can section stepless regulatiom ( 1 - 10r / m ) and step regulation ( 6 - 10r / m ) . easy to adjust drying capacity and adapt different requirement
用户可选用无级调速( 1 ? 10转分)和有级调速( 6 ? 10转分) ，便于高速干燥和适应不同的要求。
This series motors are widely used in various mechanical equipment which needs stepped speed adjustment , so that they enable the equipment to have compact structure , lower noise and ability to save energy
本系列电动广泛用于各类需要有级调速的机械设备，能使整机结构紧凑、噪声降低、能量节约。