转动惯量

采用高转差率电动机，并增加旋转件的转动惯量，是综合提高游梁式抽油机节能效果的有效途径。

指出影响使用高转差率电动机的游梁式抽油机节能的主要因素是抽油机的冲次、电动机转差率和旋转件的转动惯量。

rotary haymaker (rotary-drum rake and tedder) haymaking (haying)

rotary-type discharge control vane, rotary-type admission control vane

ducted wheel rotary pump (non-clogging rotary pump)

rotary seal

lobe rotary pump

rotary-bar type opener

sheet metal rotary offset press

trailer type sliding vane rotary air compressor