Electrically-driven hydraulic pump - cools control stage for collectorless electric motor by hydraulic fluid handled by pump

摘要

The pump is driven by a collectorless electric motor (2) with an associated control stage (3) contained within the motor housing (51) on the side of the motor facing the hydraulic pump so that it is cooled by the hydraulic fluid. Pref. the control stage uses power FET's (50) supported by a circuit board (49) acted on by clamps (55) which press the FET's into contact with the partition wall (19) between the pump and the electric motor for dissipating the generated waste heat. ADVANTAGE - Simple assembly and effective heat dissipation.