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The development and fundamental study of an electrostatic field strength sensor (novel sensor) with an air motor is investigated on a laboratory scale in this paper. This novel sensor was developed in order to measure the electrostatic field of charged dust clouds formed during the processing of large amounts of powder. The novel sensor consists mainly of the rotating sector, the sensing electrode, the air motor, the hall element, a signal cable, an enclosure and the air supply line. As for the results, the reliability of the detected signal obtained by the novel sensor with the air motor was confirmed. In other words, the electrostatic field of the simulated charge material and detected signal were clearly in direct correlation. The detected signals were mainly unaffected by air pressure. In addition, it was found that the polarity of a charged material can be discriminated through the detected signals of the novel sensor and the hall element.