讨论了油脂工业中的环形浸出器物料高度控制系统，它采用超声波传感器测量物料高度，变频器调节电机速度。
The system adopts an ultrasonic transducer to measure the material height and a PWM to control the motor speed.
讨论了油脂工业中的环形浸出器物料高度控制系统，它采用超声波传感器测量物料高度，变频器调节电机速度。
The system adopts an ultrasonic transducer to measure the material height and a PWM to control the motor speed.
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