Attention! SAI are exceeding all "Normal" Speed Limits.

The hydraulic architecture that gives the best performance in terms of efficiency is the crankshaft design radial piston motor. SAI design is characterized by cylinders supported in the motor casing by two trunnions which allow the cylinder to swivel, in this way the piston and cylinder remain aligned with the eccentric axis of the crankshaft as the shaft rotates, that is why SAI motors are featured by extremely high starting torque.

The majority of industrial equipment and mobile plant require high starting torque, efficiency and controllability, especially when heavily loaded are consequently subjected to high working stresses.

All of this can be easily obtained thanks to the new generation of variable displacement motors produced by SAI, which are capable of meeting the wide demands of the market, keeping efficiency at high levels throughout the entire speed and load ranges, whilst still maintaining excellent displacement control.

This is achieved by changing the shaft eccentricity using an electronic controller, which drives a proportional valve working via signals from the operator which are balanced by electronic feedback from the motor.

The use of variable displacement motors has a positive consequence on hydrostatic transmissions, especially those that demand high power. High efficiency levels are maintained throughout the whole operational range and are specifically noticeable at very low displacement ratios.

Together with high speed and high pressure capability, this represents a unique combination of parameters in the current fluid power discipline.

Operating at minimum displacement, the latest range of SAI variable motors can reach speeds up to 3000 rpm with the capability of reaching even 5000 rpm when eccentricity is equal to zero.

The wide operational range of these units coupled with very high efficiency in all working conditions, allows machine designers to set the prime mover within a tight designated speed range where it is working at its maximum efficiency.

Therefore the use of SAI products has a positive impact on the overall efficiency of the complete power transmission, the consequences are numerous, reduction in exhaust emissions and a decrease in thermal losses, which increase machine lifetime and consequently improve overall equipment performance.