Abstract: In one embodiment, a pump system includes a motor-to-pump transmission having a planetary gear assembly and a clutch. In another embodiment, a pump system includes a transmission having a housing with a motor mount and a pump mount, a central gear disposed in the housing, a plurality of planet gears disposed in the housing, wherein the plurality of planet gears is disposed about and engaged with the central gear. The transmission also includes an outer ring gear disposed in the housing, wherein the outer ring gear is disposed about and engaged with the plurality of planet gears.

Abstract: In certain embodiments, a pump system includes a variable output transmission having a rotatable motor coupling, a rotatable pump coupling, a planetary gear assembly disposed between the rotatable motor coupling and the rotatable pump coupling, and a clutch disposed between the rotatable motor coupling and the rotatable pump coupling. The pump system also includes a controller configured to control the clutch in response to fluid pumping feedback.