What determines the torque produced by a fixed displacement motor in a hydrostatic transmission?

The torque produced by a fixed displacement motor in a hydrostatic transmission is determined by the motor displacement and the available pressure. This relationship is grounded in basic hydraulic principles.

In a hydraulic system, the torque output of a motor is influenced by the volume of fluid that is displaced with each rotation of the motor (motor displacement) and the hydraulic pressure acting on that fluid. The formula that captures this relationship can be expressed as:

Torque = Displacement × Pressure

Here, motor displacement refers to the volume of fluid the motor can move per revolution, while the available pressure reflects the force exerted by the fluid. Therefore, if either the motor displacement increases or the available pressure increases, the torque produced by the motor will also increase, assuming the other variable is held constant.

This is important in hydrostatic transmissions, as they often rely on precise control of pressure and flow to achieve desired performance characteristics. Understanding this torque relationship allows for effective design and optimization of hydraulic systems in various applications.