Disclosed is a system for controlling a pump, such as a submersible pump intended for pumping water, including a pump and a separate electronic control unit connected to the pump by an electrical cable. The control unit is adapted to be detachably connected to the pump. The control unit is adapted to allow the pump's power supply to pass through the control unit. An electronic controller is arranged in the pump for controlling at least one of the pump's functions and/or monitoring at least one of the pump's operating conditions. The pump and the control unit are adapted to communicate with each other and transmitting signals, including necessary control and/or monitoring information/data, between each other.

A method and computer program product for defining a PWM drive signal having a defined voltage potential. The PWM drive signal has a plurality of on portions and a plurality of off portions that define a first duty cycle for regulating, at least in part, a flow rate of a pump assembly. At least a portion of the on portions of the PWM drive signal are pulse width modulated to define a second duty cycle for the at least a portion of the on portions of the PWM drive signal. The second duty cycle regulates, at least in part, the percentage of the defined voltage potential applied to the pump assembly.

A rotary unit selectively adds additives to water in a conventional bathtub automatically without a bather having to touch the additives or leave the conventional bathtub to get the additives. The rotary unit includes a plurality of pressurized canisters and a controller. The plurality of pressurized canisters are configured in a circular configuration and are disposed directly adjacent to, and communicatable with, the conventional bathtub. Each pressurized canister contains a different one of the additives. The controller is in communication with the plurality of pressurized canisters, and as such, the controller is utilized to choose one of the additives to add to the water in the conventional bathtub automatically without the bather having to touch the chosen one of the additives or leave the conventional bathtub to get the chosen one of the additives.

A hydraulically powered rotary actuator is described including: a hydraulic linear actuator which is moveable in both directions between a retracted position and an extended position; a clutch device which is operable between an engaged condition and a disengaged condition; and a rotary output member; wherein the linear actuator is coupled to the rotary output member by way of the clutch.

A viscous coupling may include: a housing part and an input body rotatable relative to the housing part that at least partially delimit an interior space; a shaft rotatable relative to the housing part and on which an output body arranged in the interior space may be formed for conjoint rotation with the shaft; a coupling region formed between the output and input bodies and configured to hold a viscous fluid to assure a coupling between the input body and the output body; a holding chamber for collecting coolant leaking from the coolant pump; a housing wall conformed integrally with the housing part and partially delimiting the holding chamber; and an actuator housing and an electric actuator therein by which a degree of the coupling between the input body and the output body may be adjustable. The actuator housing may at least partially cover the holding chamber.

A method and computer program product for defining a PWM drive signal having a defined voltage potential. The PWM drive signal has a plurality of on portions and a plurality of off portions that define a first duty cycle for regulating, at least in part, a flow rate of a pump assembly. At least a portion of the on portions of the PWM drive signal are pulse width modulated to define a second duty cycle for the at least a portion of the on portions of the PWM drive signal. The second duty cycle regulates, at least in part, the percentage of the defined voltage potential applied to the pump assembly.

Gas lock resolution during operation of an electric submersible pump is provided. An example method, module, or computing hardware with software product, detects a gas lock during current operation of an electric submersible pump (ESP) and intervenes to relieve the gas lock without stopping the ESP. After sensing a gas lock condition, an example module calculates a pump speed for attempting gas lock resolution. The example module may decrease the speed of the ESP to flush the gas lock, and then reaccelerate the ESP to check that the gas lock has been eliminated. The example module may apply one or more stored motor speed patterns that iteratively seek a pump speed that succeeds in clearing the gas lock, without stopping the ESP. The example module has built-in protections to protect the ESP from thermal overload and other damage.

A malfunction diagnosing device that includes pistons arranged in a circumferential direction and discharges oil with rotation in the circumferential direction is provided, including: a pressure sensor for detecting a pressure value of oil discharged from a hydraulic pump in rotation; a speed sensor for detecting a rotation phase of the hydraulic pump at a time when a pressure value of oil is detected by the pressure sensor; a phase calculation part; and a rendering part for rendering a model of a relationship between pressure values of oil detected by the pressure sensor and rotation phases of the hydraulic pump detected by the speed sensor and the phase calculation part to thereby obtain pulsating waveform data. This makes it possible to diagnose a malfunction of the hydraulic pump without influence of a change in a rotation speed of the hydraulic pump.

The present invention relates to a fluid circulator (100) comprising a pump body (2) comprising an impeller (10) for movement of the fluid; a motor body (1) comprising an electric motor (7, 8, 9) for setting the impeller into rotation (10); a terminal box (3) associated to the motor body (1) and containing one electronic board (12) for the control of the circulator (100), the terminal box (3) comprising a cover element (14) for closing the terminal box (3). The electronic board (12) comprises a display (6) facing towards the cover element and suitable for displaying at least one operation indication of the circulator (100), the cover element (14) is being entirely made as a single piece of transparent material so as to permit viewing the display (6) from the outside of the terminal box (3).

A method of increasing a multiplication ratio of a charge pump, the multiplication ratio defining a relationship between an output voltage of the charge pump and an input voltage of the charge pump, comprising: analyzing a first efficiency of the charge pump when the multiplication ratio is at a first ratio, calculating a second efficiency of the charge pump when the multiplication ratio is a second ratio lesser than the first ratio, and based on the first efficiency and the second efficiency, determining at least one of a target output power and a target output voltage at which to change the multiplication ratio from the second ratio to the first ratio.