A swimming machine comprising a housing adapted to be mounted to an interior wall of a swimming pool. The housing comprising a hydraulic motor connected to an impellor mounted within the housing for producing a current of water in the pool when in use. The swimming machine further comprising a hydraulic pump stored outside the housing operably connected to the hydraulic motor mounted within the housing, an electric motor connected to and powering the hydraulic pump, an inverter drive system connected to, powering and controlling the electric motor. Wherein in use the speed of the current produced is controlled by the inverter drive system.

A method of operating a dishwashing appliance includes activating a pump for a predefined self-calibration time by supplying electrical power from a power supply to a motor of the pump. The method also includes monitoring, with the sensor circuit, electrical power between the power supply and the motor while the pump is activated for the predefined self-calibration time. The method further includes determining, based on the monitored electrical power, a motor type of the motor and selecting a set of control parameters corresponding to the determined motor type of the motor. The method also includes activating the pump according to the selected set of control parameters during at least one cycle of the dishwashing appliance.

A method determines an inflection point OP of a parameter profile i, n which is representative of a component tolerance and a state of wear of a fuel pump. The fuel pump is provided for a fuel supply system for use in a device equipped with an internal combustion engine. The device being a passenger car, utility vehicle and/or a stationary or mobile power generator.

A pump arrangement includes an axial-flow machine and a drive to convey fluid mounted in a housing. The axial-flow machine is formed by at least one first rotor having permanent magnets, a shaft connected to the first rotor and a stator arrangement with stator teeth distributed concentrically around the shaft axis circumferentially and axially separated from the first rotor by an air gap. The stator teeth have axially-opposite end portions and a tooth core therebetween wound with at least one coil winding. The second end portion, turned away from the first rotor, of each stator tooth forms a tooth root joined to a back plate. The first rotor is an eccentric disk and on the side away from the stator arrangement has an eccentric cam, radially spaced from the shaft axis, and rotatably and torque-transmittingly connected to the drive. An axial-flow machine and a compressor includes the pump arrangement.

A fluid circulation monitoring system includes a distributed processing system having a first processor located on-premises near a space filled with a circulating fluid and a second processor located off-premises. The first processor and the second processor are in communication with one another. A sensor is operatively connected to the first processor and senses at least one parameter associated with a flow rate of fluid through the circulation system. The distributed processing system is configured to process the at least one parameter and derive a volumetric fluid flow rate through a fluid pump which propels the fluid through the circulation system. Pattern recognition is applied to the at least one parameter to detect maintenance events and predict the need for maintenance events.

A method for stopping a submersible pump when the pump is snoring, wherein the pump is operatively connected to a control unit. The method includes regulating, by way of the control unit, the operational speed of the pump in order to direct an average power of the pump towards a predetermined set level. The method includes determining whether the instantaneous power of the pump is outside a predetermined range, by monitoring at least one of the parameters: power [P], current [I] and power factor [cos ϕ].The method further includes determining whether the operational speed of the pump is increasing, and stopping the pump due to snoring, by way of the control unit, when the instantaneous power of the pump is determined as being outside the predetermined range at the same time the operational speed of the pump is determined as increasing.

The pump systems (pump+driver) used in a pump station are selected based on the type of fluid or batch. The selection is of the more efficient pump systems for that batch. Less efficient pumps are avoided. When a new batch is detected, the selection is performed again for that new batch, which may result in a different combinations of pump systems for a given pump station. If variable speed pump drives are available, the efficiency at the desired speed is used for selection. The cost of energy (utilities) by pump station may alternatively or additionally be used to select the speed or combination of pump systems. The pump station and pipeline operation is optimized for efficiency of pump systems and/or cost of energy (utilities) for the different pump systems based on pipeline inventory and local utilities tariffs.

A solar powered pump that maximizes available energy usage under variable insolation conditions is disclosed. It also permits the integration of parameters such as minimum flow control, set point operation, etc., without the use of additional sensors, thereby reducing the overall cost of the system.

A method is provided of controlling a pump including a electrical motor coupled to a rotor which carries first and second impellers at opposite ends thereof. The method includes: (a) driving the rotor using the motor, so as to circulate fluid from the first impeller through a first fluid circuit, the second impeller, a second fluid circuit, and back to the first impeller; (b) determining a resistance of the first fluid circuit, based on a first motor parameter which is a function of electrical power delivered to the motor; (c) determining a flow rate through the first fluid circuit based on a second motor parameter which is a function of electrical power delivered to the motor; and (d) varying at least one operational parameter of the pump so as to maintain a predetermined relationship between the flow rate and the resistance of the first fluid circuit.

The invention relates to a pump control method for the control of the operation of a pump system with at least two pump assemblies (2) which are arranged parallel or in series to one another. The method includes determining a specific total power E.sub.S of the complete pump system which defines a total power in relation to a hydraulic total load of the complete pump system, determining a specific individual power E.sub.P,n of each pump assembly (2) which defines an individual power in relation to the individual hydraulic load of the respective pump assembly (2), computing an individual load factor E.sub.gain,n for each pump assembly (2) according to the equation $E_{\mathrm{gain},n}=\frac{E_S}{E_{P,n}}$
and adapting the individual hydraulic load (Q.sub.n; H.sub.n) of the pump assemblies (2) in dependence on a desired hydraulic load (Q.sub.D; H.sub.D) as well as on the individual load factor E.sub.gain,n of the respective pump assembly (2).