Modified formula for sensorless dc motor speed estimation was proposed through the test for relationship between the current ripple frequency and the rotation speed in a 4 - pole dc motor 摘要根据4极直流电动机的转速与脉动电流频率关系的实验结果,对现有的无传感器直流电动机测速公式提出了修正意见。
Experiments indicated that the modified formula of bfp has effects on estrogenic activity and hormonal profile , anti - hypertension , and restoration of immune imbalance in aging animals 实验结果证明,白凤丸新配方对调节老年动物体内雌激素分泌、抗高血压,以及免疫系统失衡复元等多方面均产生效用。
The new modified formula not only meets with our experiment result , but also can explain the examples of relationship between the speed and the current ripple frequency of dc motors in the literature 新的修正公式不仅能够解释文中的实验结果,也能满足以往文献提出的直流电动机转速与脉动电流频率之间的关系。
The modified formulae derived from the simplified models , the one of which is the continuous beam on the elastic supports , the other is articulated beam , have been established . being analyzed , the later one is prove more reasonable 文中以弹性支承连续梁和铰接梁为基础建立计算模型,并对这两种方法进行修正,经比较后最终推导出简化的三跨铰接梁为计算模型。
On the basis of above parts , this paper discusses the noise muffling of several kinds of plates . it gives the modifying formula of the mass law and verifies its accuracy with an example . at last , this paper explains the effect of stiffeners and damping on the plates " muffling characteristics 在认识隔声理论的前提下,研究了板在宽频域范围上的隔声特性,并总结了板材加筋以及敷设阻尼对结构隔声的影响,具有一定的工程实用价值。