| 摘要 |
A method and device for driving a clothes washing machine motor at a predetermined speed is presented. The washing machine motor, which may be an AC induction motor, is powered by a DC to AC inverter that includes a DC bus. The DC bus current is measured and the inverter output frequency is adjusted in response to the DC bus current measurement. In exemplary embodiments, measuring the DC bus current includes measuring the voltage drop across a resistor coupled to the DC bus. The frequency adjustment may be calculated by multiplying the DC bus current by a compensation factor to calculate a frequency adjustment value. Alternatively, frequency adjustment values may be stored in a look-up table, and the measured DC bus current is used to index the look-up table. |
