Recently, electrical cordless chainsaws were introduced, which provide less harmful working conditions for the operators, and should therefore be deployed as much as possible in all non-professional and professional applications. The low power of the electric engines may result in lower efficiency and higher energy consumption in the case of over-tensioned chains, due to increased friction between the saw and the chain. Therefore, a partial factorial experiment with one factor on three levels (saw type) and two factors on two levels was designed, whereby a wooden beam was cross-cut at two levels of chain sharpness and tension. The time of cross-cutting and energy consumption were controlled. The chain tension does not have a significant effect onto time of cross cutting, or electricity consumption. Both have cross-cutting and energy consumption have been found to differ significantly when comparing the saws used in the experiment. The average efficiency of cross cutting using electrical chainsaws reported is 2.35 times lower than when using petrol powered saws. The lower efficiency is caused by the lower engine power of electrical saws, and lower speed of chain rotation. Energy consumption and time of cross cutting are significantly higher when using a blunt chain, with large differences in time of cross cutting and electricity consumption, making the chain sharpness the most important of all controlled factors. In the study, we did not find evidence that over tensioning of the chain increases the time of cross cutting or energy consumption, however the integration of such systems is recommended because of the worker’s safety.

中文翻译：

---

链条清晰度，张力调节和电链锯类型对能耗和交叉切割时间的影响

最近，引入了无绳电锯，其为操作员提供了较少的有害工作条件，因此应在所有非专业和专业应用中尽可能多地部署。由于链锯和链条之间的摩擦增大，在链条过紧的情况下，电动发动机的低功率可能导致效率降低和能耗增加。因此，设计了一个局部因子实验，其中一个因子在三个级别上（锯类型），两个因子在两个级别上，从而在两个级别的链锐度和张力下横切木梁。横切时间和能源消耗得到控制。链条张力对交叉切割时间或电力消耗没有显着影响。两者都具有交叉切割功能，并且在比较实验中使用的锯片时发现能耗明显不同。据报道，使用电锯的横切平均效率比使用汽油锯时低2.35倍。较低的效率是由于电锯的发动机功率较低以及链条旋转速度较低所致。使用钝链时，能耗和横切时间要高得多，横切时间和耗电量之间的差异也很大，这使得链的清晰度成为所有受控因素中最重要的。在这项研究中，我们没有发现证据表明链条过分张紧会增加交叉切割或消耗能量的时间，但是由于工人的安全性，建议将此类系统集成在一起。