Trial Production and Utility Test of a Cylindrical Multi-Electrode Corona Motor for High Power Output.

本研究的主要目的是追求轻负载静电电晕电动机的实际应用。首先，我们制作了一台放电极数为2 ~ 36的圆筒形电晕电机，并对电机的各项性能进行了测试。本项目研究的结果可概括如下。(1)利用18个放电电极的试验机，对丙烯、尼龙、聚丙烯、聚四氟乙烯等材料的转子进行了试验。从效率、价格和耐用性的角度来看，很明显丙烯酸转子是实用的。至于放电电极，不锈钢是理想的，以防止生锈的臭氧环境中，它是澄清，较薄的刀口型电极产生较大的输出的电晕电机。此外，还证实了由于电极的击穿电压，可能存在一个产生最大输出功率的电极的最佳数目。 ...更多信息 电晕电动机随着电极数量的增加而减小。(2)考虑到作为电晕电动机操作环境的气压，气压增加越高，产生的转矩变得越大，而且效率和击穿电压也增加越高。另一方面，当压力变低时，它带来降低电晕起始电压的优点，然而这种条件是不实际的，因为电晕电动机的效率和击穿电压都降低。(3)为了简化电晕电机特性的测试过程，利用桥式反馈电路构成了PWM斩波伺服自动调速器。M. F.探测器作为角速度传感器。将自动调速系统应用于电晕电机臭氧浓度的测量中，可以大大缩短每次实验的时间。(4)为了用交流电源代替直流电源来驱动电晕电机，我们用三个氖变压器将商用三相电源升压到足够高的电压，然后将其应用到三相四极共12极的连接电路中。此外，我们还构造了一个由模拟乘法器组成的功率计来测量电晕电机的输入功率。实验证明，电晕电机在三相供电条件下也能正常工作。(5)作为电晕电动机有限元分析的基础，我们研究了轴对称圆柱形电极的问题。用C语言编程实现了稳态电晕放电现象的有限元算法。对三种不同的放电电极厚度进行了模拟计算，模拟结果与实验结果吻合较好。将这种方法发展到瞬态分析是今后的一个重要问题。少

The main purpose of the present research is concerned with the pursuit of practical use of an electrostatic corona motor for a light load. First of all, we made a cylindrical corona motor for test machine whose discharging electrodes can be varied from 2 to 36, then we examined various characteristics of the motor. The results of this project research may be summarized as follows.(1) Using the test machine with 18 discharging electrodes, we tested various rotors made of aclyl, nylon, polipropylene and teflon. As the points of view of efficiency, price and durability, it became clear that the acryl rotor is practical. As for discharging electrode, stainless steel is desirable for keeping from rust in ozone surroundings, and it was clarified that the thinner knife-edged type electrodes generate the larger output of the corona motor. Moreover, it was confirmed that there may exist an opimal number of the electrodes which generate the maximum output power because the breakdown voltage of t … More he corona motor decreases as the number of the electrodes increses.(2) Concerning the air pressure as the corona motor operating surroundings, the higher the pressure increases, the larger the generating torque becomes, moreover the higher the efficiency and the breakdown voltage increase also. On the other hand, when the pressure becomes lower, it brings a merit of lowering of the corona onset voltage, however such condition is unpractical because both the efficiency and the breakdown voltage of the corona motor decrease.(3) In order to simplify the measuring procedure of the corona motor characteristics, automatic speed controller with PWM chopper servo was constructed making use of a bridge-type back e. m. f. detector as the angular velocity sensor. By using the automatic speed adjustment system in measuring the ozone concentration of the corona motor, it was confirmed that the time consumed for each experiment was shortened considerably.(4) In order to drive the corona motor by ac power supply instead of dc one, we boosted the commercial 3-phase power source up to sufficiently high voltage by using three neon transformers, and then we applied it to the 3-phase-4-electrodes connection circuit which has 12 electrodes altogether. Moreover we constructed a power meter consisting of an analog multiplier to measure the input power of the corona motor. It was proved that the corona motor can operate sufficiently even under the 3-phase power supply.(5) As a basis of a finite element analysis of the corona motor, we investigated a problem of axissymmetrical cylindrical electrodes. We used C language program to realize a finite element algolithm of the corona discharge phenomenon in steady state. Simulations for three kinds of discharging electrode thickness were excuted and the results proved to be in good agreement with the experimental results. Development of this method to transient state analysis is an important problem in future. Less