A brief discussion on how to calculate the starting voltage for DC cooling fans?
Category:
Industry Trends
Release time:
2021-01-18
First, let’s get an understanding of what it is. DC cooling fan The starting voltage and rated voltage.
1. Starting voltage: The minimum voltage required to start the fan when power is suddenly applied.
2. Operating voltage: Refers to the stable voltage that, once applied, enables the fan to operate normally—this is the rated voltage.
Secondly, what exactly is the relationship between the starting voltage and the rated voltage?
The start-up voltage: Typically, the rated voltage of a DC fan is 12V, while its start-up voltage is generally below 7V. Since the system-supplied voltage may be unstable, the lower the start-up voltage, the greater the margin relative to the rated voltage of 12V. This means that the DC fan can operate over a wider voltage range, ensuring it can be reliably activated at low voltages even when the supply voltage is unstable. Next: The testing method for the start-up voltage.
The magnitude of the starting voltage can be measured using testing instruments such as a multimeter. A low operating current for the fan not only reduces power consumption but also minimizes heat generation in the fan motor, thereby extending the fan’s service life. For oil-lubricated fans, this lower current also slows down the evaporation of the lubricating oil; thus, the lower the current, the higher the fan’s reliability. Under conditions where the air volume and pressure remain constant, the lower the fan’s operating current, the lower its shaft power will be—while the actual power transferred to the gas remains unchanged, resulting in higher fan efficiency. The fan’s operating current can be observed using an ammeter.
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