Abstract:
A motor controller coupled to a motor is described. The motor controller includes a computing device configured to receive a first command designating a duration during which to operate the motor. The computing device is further configured to operate the motor during a first portion of the designated duration, receive a second command to pause the operation of the motor, in response to receiving the second command, pause the operation of the motor, receive a third command to resume the operation of the motor, and in response to receiving the third command, resume the operation of the motor for a second portion of the designated duration.
Abstract:
An axial flux electric machine comprises a rotor assembly configured to rotate about an axis of rotation. A stator core is coupled to the rotor assembly. The stator core comprises a stator core base and a plurality of circumferentially-spaced stator teeth extending from the base in a direction parallel to the axis. Each stator tooth of the plurality of stator teeth comprises a top surface, a pair of opposing circumferential sides, and a chamfered portion defined at an intersection of the top surface and each of the pair of opposing sides. The chamfered portion facilitates reducing an amount of torque ripple produced by the axial flux electric motor.
Abstract:
A water heater system comprises a water tank, a burner plenum, a flue, a blower, a combustion air passageway, a dilution air passageway, an upstream manifold, and a downstream manifold. The upstream manifold divides air from the blower so that some air flows through the combustion air passageway to the burner plenum and some air flows through the dilution air passageway to the downstream manifold. The downstream manifold combines the air from the dilution air passageway with combustion products from the flue.
Abstract:
A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower.
Abstract:
In one aspect, a flexible fan blade for use in a centrifugal fan impeller having at least one of a rear plate and a front plate with an air inlet is provided. The flexible fan blade comprises a fixed central portion fixedly coupled to at least one of the front plate and the rear plate of the centrifugal fan impeller. The flexible fan blade also includes a trailing edge extending from the fixed central portion and being moveable between a first position and a second position. The trailing edge is fabricated from a compliant material. Furthermore, the trailing edge is flexible in relation to the fixed central portion between a first position and a second position. The flexible fan blade also includes a leading edge extending from the fixed central portion in opposed relation to the trailing edge.
Abstract:
A motor comprises a stator assembly, a rotor assembly having a stator core, and a stator cup adjacent the stator core. The inside surface of the stator cup comprises a plurality of aligned regions and a plurality of pressure regions. Each of the plurality of aligned regions is axially aligned with a corresponding one of a plurality of fastener-engaging regions of the stator cup. Each of the plurality of pressure regions is spaced from each of the plurality of aligned regions. A plurality of fastening portions operatively engages the fastener-engaging regions and operatively engages the stator core in a manner urging the stator core and the stator cup toward one another. Urging of the stator core and the stator cup toward one another by the plurality of fastening portions causes the stator core to exert pressure on the plurality of pressure regions. The pressure being exerted on the plurality of pressure regions by the stator core as a result of the fastening portions urging the stator core and the stator cup toward one another is greater than pressure being exerted on the plurality of aligned regions by the stator core.
Abstract:
A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower.
Abstract:
Methods and systems of controlling the operation of a pump according to a pump operation schedule are described. In one constructions, a pump controller enters a programming mode and monitors a number of inputs received through a user interface while in the programming mode. The programming mode is then exited and a delay time is defined equal to one hour for each input received through the user interface while in the programming mode. A stored pump operation schedule is accessed and operation of the pump is initiated according to the pump operation schedule after a period of time equal to the delay time has elapsed since exiting the programming mode. Operation of the pump is again initiated according to the accessed pump operation schedule every twenty-four hours since the pump operation schedule was last initiated.
Abstract:
There is provided a bus bar fuse holder configured to receive a fuse link and couple each end of the fuse link to a line conductor and a load conductor within the holder. The bus bar holder includes a housing that defines a space in the housing proximate one of a line terminal and load terminal. A clamp unit is configured to receive a portion of a bus bar with the lineup clamp unit disposed in the space defined in the housing. The space configured in the housing also encloses a substantial portion of the bus bar within the housing in a space defined between U-shaped members of the clamp unit.
Abstract:
A system and a method of automatically determining an electric motor type are provided. An electric motor drive controller is configured to be coupled to an electric motor and to determine running parameters of the drive controller for the electric motor. The drive controller includes a memory device, a processor communicatively coupled to the memory device and to a user interface wherein the processor is configured to execute instructions stored on the memory device that cause the processor to automatically measure electrical characteristics of the electric motor, identify the electric motor using the measured electrical characteristics, load pre defined running parameters selected based on the identification into the memory device, and control an operation of the electric motor using the controller and the loaded running parameters.