The fanless design ensures complete noiselessness and maintenance-freeoperation.
无风扇设计，无噪音维护便捷。
2
Their electronically commutated brushless DC motor provides virtually maintenance-freeoperation over time by eliminating brush maintenance and associated brush motor failure.
其电子换向直流无刷电机通过排除刷子维护和关联电机的出错，在操作过程中提供免维护操作。
3
The practice proves that this system can be effectively increase the level of freemaintenance and operation reliability of DC adjusting speed control system.