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Hydrostatic Fan Drives
Reversible Fan Drive, Electronic Controlled with Axial Piston Pump and Motor in a closed Hydraulic Loop
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For systems that require the fan wheel to reverse (e.g. for cooler self-cleaning process), drive systems in a closed loop are used.
By simply reversing the hydraulic pump’s discharge direction, the direction of rotation of the hydraulic motor and thereby the fan wheel can be changed without complex valve mechanics.
The advantages of the closed loop are particularly apparent where the fan drive system needs to be cleaned frequently due to adverse environmental conditions and increased accumulation of dirt.
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Advantages
- Simple reversal of the fan wheel’s direction of rotation by reversing the hydraulic pump
- Switching off the fan wheel by zero positioning the hydraulic pump
- Displacement volume of the hydraulic pump is independent of operating pressure and thereby independent of the cooler resistance
- No need for make-up at the hydraulic motor
- Safeguards the maximum fan speed using hydraulic pressure cut-off at the hydraulic pump
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Relevant links for Fan Drives
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