Abstract: Devices and methods for operating a diaphragm compressor. Embodiments of the present disclosure comprise an oil piston being driven to pressurize work oil against the diaphragm of the compressor. In embodiments, an injection pump provides a supplemental flow of work oil in the region of pressurized fluid, and such pump may be part of an actively controlled system. In embodiments, a pressure relief valve vents an overpump flow of work oil, and such valve may be variable. Embodiments provide feedback and control mechanisms, including control of the injection pump and the relief valve.

Abstract: Systems and methods are for a machine having an alternating current (AC) power source with a first side and a second side, at least one winding, a voltage polarity sensor, a Hall effect sensor, four bi-directional power switches each comprising two DC power switches, and a motor controller. The motor controller is configured to, based on signals from the voltage polarity sensor and the Hall effect sensor, opens or closes or operates with pulse-width modulation the DC power switches to obtain a first direction of current flow through the at least one winding and a second direction of current flow from the first side of the AC power source to the second side of the AC power source or from the second side of the AC power source to the first side of the AC power source.