The previous descriptions of how ideal machines work were simplifications and are only approximately true. The discussions of hydraulic and electric motors require some re-interpretation because of the effects of adding the losses to the machine models.
For the hydraulic motor connected to a pump, flow from the pump will equal the flow into the motor. However, actual flows are not the same as the displaced (ideal) flow. The ideal equation will yield too high a motor speed because it does not account for internal (volumetric) leakage of the pump and of the motor...
Register or Sign in below to download the full article in .PDF format, including high-resolution graphics and schematics when applicable.