| 摘要 |
FIELD: electrical engineering. ^ SUBSTANCE: in steady-state operation of induction motor, instant consumed current of stator one phase is registered and subjected to discrete Fourier transformation to derive gain-phase characteristic of consumed current in said stator phase. At the same time, primary current component with supply circuit frequency fc and maximum-amplitude side current components with low frequency fL, smaller than that of supply circuit, and high frequency fH, higher than that of supply circuit, are selected and amplitudes of current side components are compared. If aforesaid amplitude of low-frequency current exceeds that of high-frequency current, rotor current frequency is defined by the following expression, i.e. fp=fc-2(fc-fH). If aforesaid amplitude of high-frequency current exceeds that of low-frequency current, rotor current frequency is defined by the following expression, i.e. fp=fc-2(fH-fc). ^ EFFECT: higher accuracy of determination. ^ 7 dwg, 2 tbl |
