Radially embedded permanent magnet rotor and methods thereof

    公开(公告)号:US10608488B2

    公开(公告)日:2020-03-31

    申请号:US15885055

    申请日:2018-01-31

    Abstract: In one embodiment, a permanent magnet rotor is provided. The permanent magnet rotor includes at least one permanent magnet and a substantially cylindrical rotor core including an outer edge and an inner edge defining a central opening. The rotor core includes a radius R, at least one pole, and at least one radial aperture extending radially though the rotor core from the outer edge to a predetermined depth less than the radius. The at least one radial aperture is configured to receive the at least one permanent magnet. The rotor further includes at least one protrusion extending into the at least one radial aperture, the at least one protrusion positioned substantially along a bottom of the at least one radial aperture and configured to facilitate retention of the at least one permanent magnet within the at least one radial aperture.

    Blower assembly with compensation for vent back pressure

    公开(公告)号:US10533771B2

    公开(公告)日:2020-01-14

    申请号:US15181598

    申请日:2016-06-14

    Inventor: Steven W. Post

    Abstract: A blower assembly is configured for use with a gas-operated heater having a burner and an exhaust port. The blower assembly has a blower and a sensor. The blower is configured to operate at two or more speeds and is configured to operatively connect to the burner in a manner to facilitate flow of combustion air into the burner and to facilitate flow of exhaust through the exhaust port. The sensor is configured to be sensitive to pressure of exhaust downstream of the blower. The sensor is operatively connected to the blower in a manner such that the blower will change speeds if said pressure exceeds a threshold pressure.

    PUMP ASSEMBLY HAVING AN AXIAL FLUX ELECTRIC MOTOR

    公开(公告)号:US20190383292A1

    公开(公告)日:2019-12-19

    申请号:US16439039

    申请日:2019-06-12

    Abstract: A pump assembly includes a pump housing having a fluid inlet, a fluid outlet, and a fluid channel defined therebetween. The pump assembly also includes an impeller positioned within the fluid channel and configured to channel a fluid between the fluid inlet and the fluid outlet. The pump assembly also includes a motor assembly having a shaft coupled to the rear plate, wherein the shaft defines a first fluid cavity coupled in flow communication with an opening in the rear plate to enable fluid flow into the shaft. The motor assembly also includes a motor housing having a back plate positioned relative to the impeller rear plate to define a second fluid cavity therebetween. The motor assembly further includes a stator assembly coupled to the back plate and positioned opposite the second fluid cavity such that the fluid facilitates cooling the stator assembly.

    HIGH EFFICIENCY FORWARD CURVED IMPELLER AND METHOD FOR ASSEMBLING THE SAME

    公开(公告)号:US20190338782A1

    公开(公告)日:2019-11-07

    申请号:US15969408

    申请日:2018-05-02

    Abstract: A fan blade for a fan impeller is coupled to a front endring and a rear endring. The fan blade includes a first portion, a second portion, a third portion, a leading edge, and a trailing edge. The second portion is positioned on a first side of the first portion. The third portion is positioned on a second side of the first portion. The leading edge defines a leading edge blade angle and the trailing edge defines a trailing edge blade angle. The leading edge blade angle and the trailing edge blade angle are constant within the first portion and the leading edge blade angle and the trailing edge blade angle vary within the second portion and the third portion.

    MOTOR CONTROLLERS AND METHODS FOR CONTROLLING DRIVE CIRCUIT BYPASS SIGNALS

    公开(公告)号:US20190319569A1

    公开(公告)日:2019-10-17

    申请号:US15954027

    申请日:2018-04-16

    Abstract: Motor controllers and methods for controlling drive circuit bypass signals are provided. The motor controller includes a drive circuit configured to generate variable frequency power based on input power received from a power source, and a drive contactor coupled between an output of the drive circuit and the motor. The drive contactor is configured to couple the drive circuit to the motor when a drive enable signal is received from an external controller, and decouple a line power enable signal from a line contactor by the external controller based on a presence of the drive enable signal. The line contactor is configured to couple the motor directly to the power source when the line power enable signal is received by the line contactor.

    METHODS, SYSTEMS, AND APPARATUS FOR REDUCING COGGING TORQUE IN AN ELECTRIC MACHINE

    公开(公告)号:US20190319499A1

    公开(公告)日:2019-10-17

    申请号:US16451908

    申请日:2019-06-25

    Abstract: An interior permanent magnet machine is described. The machine includes a rotor rotatable about a central machine axis. The rotor includes a plurality of permanent magnet openings and a plurality of permanent magnets disposed therein. The permanent magnet openings are separated by rotor webs configured to facilitate reducing leakage flux through the rotor webs. The machine also includes a stator disposed coaxially with the rotor and separated from the rotor by a circumferential air gap. The stator includes a plurality of stator teeth that define a plurality of stator slots therebetween. The stator teeth include a stator tooth tip configured to facilitate reducing cogging torque and torque ripple.

    DRIVE CIRCUIT FOR ELECTRIC MOTORS
    498.
    发明申请

    公开(公告)号:US20190305709A1

    公开(公告)日:2019-10-03

    申请号:US15939606

    申请日:2018-03-29

    Abstract: A drive circuit for an electric motor includes a variable frequency drive (VFD), a drive contactor, and a controller. The VFD is configured to receive line frequency current from a power source and apply a fixed frequency voltage to convert the line frequency current to a fixed frequency current. The drive contactor is configured to selectively couple the drive circuit to windings of the motor. The controller is configured to monitor for presence of a control signal applied to the drive contactor, wherein presence of the control signal closes the drive contactor to couple the drive circuit to the windings of the electric motor. The controller applies the fixed frequency voltage from the VFD to the windings upon determining presence of the control signal, determines whether the motor is motoring or regenerating after applying the fixed frequency voltage, and gradually increases the fixed frequency voltage applied to the windings when the motor is motoring.

    Information collection system, pump system and associated method

    公开(公告)号:US10416685B2

    公开(公告)日:2019-09-17

    申请号:US15460998

    申请日:2017-03-16

    Abstract: An information collection system for a pump for removing fluid collected by a buildings drainage system from subterranean locations adjacent a building is provided. The system includes a sensor for sensing operation information regarding the operation of the pump and an information collection device operably connected to the sensor and adapted to receive the operation information. The system also includes an information storage device operably connected to the information collection device and adapted to store the operation information. The system further includes a retrieval device operably connected to the storage device and adapted to retrieve the operation information.

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