What impact does ambient temperature have on the input power of the S47-D71D4-158.1-B-M1-270 reducer?

The ambient temperature does not directly change the input power of the S47 reducer, but it will indirectly affect the actual input power demand of the motor by affecting the system efficiency and load demand.

The nominal input power of the S47 reducer (such as 0.55kW, 1.1kW, etc.) is the design value measured under standard working conditions (usually ambient temperature 20–40°C). The temperature itself will not change this rated parameter. However, ambient temperature changes will indirectly affect the input power required in actual operation through the following mechanisms:

‌1. High temperature environment (>40℃)‌

The viscosity of the lubricating oil decreases and the oil film becomes thinner, resulting in increased gear friction and reduced transmission efficiency.

In order to overcome the additional friction loss, the motor needs to output higher torque, thus increasing the actual input power.

At the same time, it is difficult to dissipate heat in the motor windings, copper losses increase, and efficiency decreases, further pushing up the input current.

Some models need to be derated or enhanced cooling when used >40°C, otherwise overheating protection may be triggered.

2‌, low temperature environment (<0℃, especially <-10℃)‌

The viscosity of the lubricating oil rises sharply, and the resistance during startup increases significantly, resulting in a significant increase in input power demand at the moment of startup.

If the initial output power of the motor is insufficient, it may cause startup failure. A higher power motor must be selected or low-temperature lubricating oil must be used.

‌3. Environment with severe temperature fluctuations‌

Repeated thermal expansion and contraction may cause abnormal mechanical fit, increase internal friction, and continuously push up input power requirements under long-term operation.

The risk of condensation may lead to insulation degradation, causing abnormal operation of the motor and indirectly affecting power stability.