Pumps and Motors

Fixed- and variable-displacement devices for mechanical-hydraulic energy conversion

Use these blocks to model pumping in the hydraulics (isothermal) domain.

Simscape Blocks

Angle Sensor	Ideal angle sensor with measuring range from 0 to 360 degrees
Centrifugal Pump	Centrifugal pump with choice of parameterization options
Fixed-Displacement Motor	Hydraulic-to-mechanical power conversion device
Fixed-Displacement Pump	Mechanical-to-hydraulic power conversion device
Jet Pump	Jet liquid-liquid pump
Porting Plate Variable Orifice	Variable orifice between piston and porting plate
Swash Plate	Swash plate mechanism
Variable-Displacement Motor	Variable-displacement bidirectional hydraulic motor
Variable-Displacement Pressure-Compensated Pump	Hydraulic pump maintaining preset pressure at outlet by regulating its flow delivery
Variable-Displacement Pump	Variable-displacement bidirectional hydraulic pump

Topics

Modeling Power Units
Modeling considerations for hydraulic power generation systems.

Featured Examples

Closed-Loop Actuator with Variable-Displacement Pressure-Compensated Pump

A closed-loop actuator that consists of a proportional 4-way directional valve driving a double-acting hydraulic cylinder. The cylinder drives a load consisting of a mass, viscous and Coulomb friction, constant force, and a spring. The actuator is powered by a variable-displacement, pressure-compensated pump, driven by a constant velocity motor. Pipelines between the valve, cylinder, pump, and the tank are modeled using the Hydraulic Pipeline blocks.

Open Model

Hydraulic Motor Driven by Load-Sensing Variable-Displacement Pump

A circuit using a load-sensing and pressure-limiting unit in a conventional reciprocal system with variable load on the forward stroke. The unit limits output pressure to 300 bar and maintains a preset pressure drop in 10 bar across velocity control orifice on the discharge port of the pump. The unit is built of two 3-way, 2-position valves, two single-acting hydraulic valve actuators, and one double-acting hydraulic valve actuator.

Open Model

Priority Valve Controlling Two Hydraulic Motors

A pressure-compensated 3-way flow control valve. This valve maintains constant flow rate through the main hydraulic motor, which is connected to the pressure-compensated outlet of the flow control valve. It acts as a priority valve, diverting the excess flow to the auxiliary hydraulic motor if the main hydraulic motor receives enough fluid to maintain a preset angular velocity. The auxiliary motor is shut off completely if there is insufficient flow to power the main hydraulic motor.

Open Model