An electronically commutated hydraulic machine is coupled to a drivetrain. Working chambers of the hydraulic machine are connected to low and high pressure manifold through electronically controlled valves. The phase of opening and closing of the valves has a default. In order to avoid cycle failure due to acceleration events, for example due to backlash in the drivetrain, the phase of opening or closing of the electronically controlled valves is temporarily advanced or retarded from the default timing.

An injector generator for use in geomechanical pumped storage systems includes a power end and a fluid end. The fluid end has one or more fluid chambers each having a fluid inlet and outlet that are controlled by rotary valves. The fluid end can function as a pump or as a motor driven by fluid pressure from the geomechanical storage formation.

An injector generator for use in geomechanical pumped storage systems includes a power end and a fluid end. The fluid end has one or more fluid chambers each having a fluid inlet and outlet that are controlled by rotary valves. The fluid end can function as a pump or as a motor driven by fluid pressure from the geomechanical storage formation.

An electronically commutated hydraulic machine is coupled to a drivetrain. Working chambers of the hydraulic machine are connected to low and high pressure manifold through electronically controlled valves. The phase of opening and closing of the valves has a default. In order to avoid cycle failure due to acceleration events, for example due to backlash in the drivetrain, the phase of opening or closing of the electronically controlled valves is temporarily advanced or retarded from the default timing.

The distributor phase shifter for a hydraulic pump motor (300) is provided for a hydraulic pump motor (1) which includes a pump motor housing (2) and a pump motor central rotor (3) to which an input-output distributor (43) presents an input-output angular collector of an internal conduit (44) and an input-output angular collector of an external conduit (89), which phase shifter includes a phase shift acting element (301) which is supported on the housing of the pump motor (2) in order to make the input-output distributor (43) rotate around its longitudinal axis and over a determined angular range.

A radial piston motor includes a cam body and a working member. The cam body includes circumferentially arranged lobes. Each lobe includes a cam section for guiding a piston radially outwards. Each cam section includes a deceleration phase configured to radially decelerate an engaging piston in the case of constant rotational speed and an acceleration phase configured to radially accelerate an engaging piston in the case of constant rotational speed. The working member is rotatable relative to the cam body and has circumferentially arranged pistons. The number of pistons and the number of lobes have the number one as the only common factor and the numbers differ from each other. The deceleration phase is smaller than the acceleration phase.

An injector generator for use in geomechanical pumped storage systems includes a power end and a fluid end. The fluid end has one or more fluid chambers each having a fluid inlet and outlet that are controlled by rotary valves. The fluid end can function as a pump or as a motor driven by fluid pressure from the geomechanical storage formation.