Where electric motors fail: heat, supply, bearings, water and dust

Most industrial motor failures end in a winding or a bearing issue, and most of them start to fail months earlier, in the specification, the installation or the maintenance routine. On site, two causes usually act together: a blocked fan on a hot afternoon, or a drive retrofit with no shaft earthing. Heat: insulation class, […]
Three-phase induction motor selection: frame size, duty, IP rating and efficiency class for Australian sites

Specify and select a three phase motor in this order: load and duty, then the drive arrangement, then the site, and only then the efficiency class and the frame. Wrong selections usually consider this backwards, starting from the frame of the old motor or the IE class in the tender. Load and duty first: starts […]