When a induction motor connected with machine-tool spindle is driven by an inverter, the non-sinusoidal voltage and current components in the form of high-frequency harmonics causes motor vibration, nois, and power loss. The article discusses the test...
When a induction motor connected with machine-tool spindle is driven by an inverter, the non-sinusoidal voltage and current components in the form of high-frequency harmonics causes motor vibration, nois, and power loss. The article discusses the testing and analysis of these factors and, in particular, clarifies the nois loss mechanism through analysis of response of magnetomotive forces caused by time-depe-ndent harmonics These findings are illustrated by examples of ventilatlon and analysis of smalll inductioin motors.