A motor leakage current detector and/or a heat compensating circuit, devices using same and related methods are disclosed herein. Included are a uniquely wired current transformer to allow for polarity agnostic leakage current detection, a leakage current detector using same and having a notifier to alert a user. In other forms, an accessory power cord and power strip are disclosed capable of detecting early motor failure conditions. In still other forms, other machinery failure early warning systems are disclosed as are numerous motor operated devices using same including without limitation pumps.

An electric driven hydraulic fracking system is disclosed. A pump configuration includes the single VFD, the single shaft electric motor, and the single hydraulic pump mounted on the single pump trailer. A controller associated with the single VFD and is mounted on the single pump trailer. The controller monitors operation parameters associated with an operation of the electric driven hydraulic fracking system as each component of the electric driven hydraulic fracking system operates to determine whether the operation parameters deviate beyond a corresponding operation parameter threshold. Each of the operation parameters provides an indicator as to an operation status of a corresponding component of the electric driven hydraulic fracking system. The controller initiates corrected actions when each operation parameter deviates beyond the corresponding operation threshold. Initiating the corrected actions when each operation parameter deviates beyond the corresponding operation threshold maintains the operation of the electric driven hydraulic fracking system.

In a pump device, in a flat plate-shaped circuit board that is disposed so that the axial direction of a central rotating shaft and the thickness direction coincide with each other, a notch that a cut-out from an end face of the circuit board toward an inside of the circuit board is formed. In the vicinity of the notch on a surface of the circuit board, a solder land where a plurality of core wires that are exposed on the distal end side of a lead wire are fixed by soldering is formed. In the pump device, the distal end portion of a cover portion including the distal end of the cover portion of the lead wire drawn out from the circuit board is disposed in the notch.

Various embodiments are directed to use of RF and WiFi control in a fan device to control fan status and speed and/or fan light on/off status and intensity. A customer premises includes a WiFi router through which WiFi communications can be sent from a WiFi capable device, e.g., a cell phone, to control the fan device and its various functions. While WiFi control is via a WiFi router in the home, the control signals normally do not traverse the Internet or another external network. In addition to WiFi control, control of the fan device can be via an RF control device, e.g., a wall mounted controller. In some embodiments, the fan device reports its state and/or changes in state due to received commands to a server, and the server generates a recommended normal control schedule and an away control schedule and then uses the schedules to control fan device.

A controller with an RF interface is used to control a fan device which includes a fan motor and may also include a lighting device. The controller in some embodiments is in the form of a wall control module which may be mounted in a standard electrical wall box in a room in which the fan device to be controlled is located. To simplify installation and avoid the need for more than the normal 120 v power line used to power an outlet of light, from a 120V AC prospective the controller acts as a simple pass through device through which AC power is supplied to the fan device unit. As a safety, the controller includes an AC disconnect which can be used to cut all power to the fan unit.

A pump assembly for a dishwashing appliance includes an inner diffuser shell defining a motor housing and an outer diffuser shell spaced apart from the inner diffuser shell to define a diffusing plenum. A motor positioned within the motor housing rotates a wash pump impeller and urges a flow of wash fluid through the diffusing plenum. Within the diffusing plenum, guide vanes extend between the inner diffuser shell and the outer diffuser shell to diffuse and direct the flow of wash fluid.

A pump assembly for a dishwashing appliance includes an inner diffuser shell defining a motor housing and an outer diffuser shell spaced apart from the inner diffuser shell to define a diffusing plenum. A motor positioned within the motor housing rotates a wash pump impeller and urges a flow of wash fluid through the diffusing plenum. Within the diffusing plenum, guide vanes extend between the inner diffuser shell and the outer diffuser shell to diffuse and direct the flow of wash fluid. The motor is powered by electrical wires that pass through a hole defined through the outer diffuser shell, through one of the plurality of guide vanes, and through the inner diffuser shell.

A centrifugal pump assembly, with electric motor arranged in a casing, includes at one end, a wet section, formed by a volute and containing an impeller, and, at the other end, a box, which contains an electrical board, in contact with one end of the casing. The electric motor is of the permanent-magnet brushless type and the casing is made of stainless steel.

A pump device for delivering fluid to be pumped includes at least one drive unit with a drive and at least one receiving region on which at least two pump cartridges can be positioned so as to be hydraulically connected in series.

An electric oil pump includes a motor part having a shaft; a pump part that is driven by the motor part via the shaft and discharges oil; and a control part configured to control an operation of the motor part. The motor part includes a rotor, a stator, and a motor housing in which the rotor and the stator are accommodated. The pump part includes a pump rotor attached to the shaft and a pump housing having a housing part in which the pump rotor is accommodated. The control part includes an electronic component and a board having a surface on which the electronic component is mounted. The board is disposed outside the stator in a radial direction and within a range of the motor part in the axial direction, and the surface of the board is disposed to face the stator and extends in the axial direction.