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Preliminary calculation of mechanical efficiency of LG washing machine clutch
- Nov 19, 2018 -

The mechanical efficiency calculation of the single output clutch is relatively simple. Therefore, we mainly calculate the mechanical efficiency of the multi-output LG washing machine clutch. For the multi-output clutch, the energy loss during washing mainly has the following sources: 1. Input shaft/washing shaft The friction of the sliding bearing; 2, the friction inside the planetary gear train; 3, the friction between the washing shaft water seal and the dewatering shaft water seal.

 

The concentrated performance of the above friction can be seen as the clutch washing start torque M1 (0.1~0.3Nm) of the LG decelerator. If the input shaft ω1 is 850 rpm, that is, 89 rad/s, the energy loss caused by the washing start torque is 0.3 Nm. It is P1=M1*ω1=0.3*89=26.7(W); the corresponding washing machine motor rated output power P0 is 200w, so when the full load is output, the clutch washing mechanical efficiency η1=(P0-P1)/P0*100 %=(200-26.7)/200*100%=86.7%.

 

When the washing machine is dehydrated, its energy loss mainly includes several aspects: 1. The friction of the ball bearing; 2. The friction of the water seal of the dewatering shaft. These frictional forces are concentrated as the dehydration starting torque M2, usually 0.2~0.5Nm, taking 0.4Nm, and the dehydration shaft rotation speed ω2 is 850rpm, ie 89rad/s, so the energy loss caused by the dehydration starting torque is P2=M2* Ω2 = 0.4 * 89 = 35.6 (W). The corresponding washing machine motor rated output power P0 is 200w, so when the full load is output, the mechanical efficiency of the LG decelerator η2=(P0-P2)/P0*100%=(200-35.6)/200*100%=82.2% . 

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