Transformer mechanical energy storage pressure cylinder

How does a hydraulic transformer work?

Hydraulic systems deliver their energy to either hydraulic motors or hydraulic cylinders. In most cases, these loads have stop-and-go operation, which means that the displacement principle used in the transformer needs to be operated frequently at these conditions as well.

Do hydraulic cylinders need a transformer?

Instead, the loads need to be controlled directly at the load (also referred to as secondary control). Rotating loads could be controlled by variable displacement motors, but hydraulic cylinders need to be controlled by means of hydraulic transformers. The problem is, however, that these transformers are not yet available on the market.

Why does a transformer need a high pressure accumulator?

The transformer needs to be able to move oil from a lower to a higher pressure level, for instance when energy needs to be recuperated from a load pressure, which is lower that the pressure level in the high pressure accumulator. ⁄ . If for instance < and 0 needs to be supplied to the transformer from the low pressure side.

Can a transformer based on a single hydraulic machine have three pressure ports?

A transformer based on a single hydraulic machine with three instead of two pressure ports, as has been designed by Innas (IHT) [22-24]. Both concepts are evaluated in the next two sections of this paper. 4. COMBINATIONS OF TWO PUMP/MOTORS (CHT)

What makes a hydraulic transformer a hydrostatic machine?

This requires some kind of pump or motor principle. Therefore, hydraulic transformers are hydrostatic machines, like hydrostatic pumps and motors. Taking into consideration the power, pressure, and flow demands, they need to be built around some kind of rotating displacement principle.

What are the demands of a hydraulic transformer?

The demands of hydraulic transformers are different from conventional pumps and motors. The efficiency needs to be higher (also at low rotational speeds, in combination with high pressure levels), the dynamic response needs to be higher, and the noise level needs to be lower.