SAI has developed a new range of motors and drive units designed to offer higher power and displacement density that can potentially provide several performance advantages when used in drilling machines.
SAI’s new range of motors is designed for durable performance and can be used in harsh environments or for continuously long periods leading to reduced maintenance and operational costs.
SAI motors operate on the basis of an eccentric crankshaft and swivelling cylinders. This design has been further developed by introducing a variable eccentricity crankshaft.
Since the crankshaft can provide a variation of its eccentricity in a continuous way from maximum to zero, the displacement of the motor can similarly vary, adapting the torque and speed output of the drive to the operational requirements of the machines.
Specific characteristics make SAI motors very flexible and easy to use when drilling any ground condition.
For instance, the long-established high volumetric efficiency of SAI motors lends itself to very accurate controllability of rotational speed even at times of vastly varying load/pressure.
The high starting efficiency offered in every displacement within the range overcomes the obstacles found during the drilling operation at start up or during low speed running.
A multiple motor set-up offers enhanced variation possibilities giving way to an extremely wide operational range of the machine.
Variable motors can be controlled separately or with a single input signal and the addition or elimination of motors can be done automatically without stopping the drilling operation.
The increased power density of the T Series motors that can now work continuously at 350 bar and reach peak pressure in the range of 500 bar, allows the drilling machine to make efficient use of the installed power.
Together with the high speed characteristics of SAI motors, this feature allows them to make profitable use of the maximum oil flow installed on the machine, thereby reducing drilling time.
Multiple smaller motors offer an advantage of a single motor by providing high turn down ratios between maximum and minimum speed of up to 12:1. The power level is available from 70 Kw through to over 300 Kw.
SAI motors typically offer high resistance to cavitation, reducing the complexity of valving systems and consequently, the size of the drive and its accompanying costs.
SAI motors are designed to increase machine productivity and operational profitability.