... , compact design, high efficiency, low noise and low price from 4W to 23W, 600 to 2300 for choice. 1. ... Constant peeds preset at factoryTime reverse2 speedsVariable speed by 0-10V/PWMNTC speed control24v/48vdc version ModelVoltage Range Frequency ... Railway technology, Purification business, Automobiles, Renewable Energy Equipment, etc. 0-10V variable speed beverage cooler EC fan motor for refrigerator