METHODS AND CIRCUITS FOR CROSS CONDUCTION PROTECTION IN AN ELECTRIC MOTOR

    公开(公告)号:US20240388236A1

    公开(公告)日:2024-11-21

    申请号:US18320612

    申请日:2023-05-19

    Abstract: A system including an electric motor of a compressor system and a controller is disclosed. The electric motor includes a switch configured to provide line frequency power to the electric motor to drive the electric motor at a full speed, and an inverter to provide variable frequency power to the electric motor to drive the electric motor at a variable speed. The controller is configured to determine whether the switch is closed in response to powering up the electric motor and before supplying the variable frequency power to the electric motor from the inverter. The controller is configured to prevent supply of the variable frequency power to the electric motor from the inverter to prevent damage to the inverter based on the determining that the switch is closed and generate an alert notification to notify a user of a fault in the switch.

    CAPACITANCE BASED LIQUID, ICE, AND FROST SENSOR

    公开(公告)号:US20240328983A1

    公开(公告)日:2024-10-03

    申请号:US18128907

    申请日:2023-03-30

    CPC classification number: G01N27/226 G01N33/18 F25D21/02 G01N33/1873

    Abstract: A frost sensor, or a frost/ice/water sensor, and systems and methods of using the same, are provided herein. The frost sensor includes a body including a measurement circuit, and a capacitance sensor including two or more co-planar plates coupled to and extending laterally from the body. The measurement circuit is configured to measure a capacitance sensed by the capacitance sensor, the measurement representing a change of material between the plates over time. The frost sensor also includes at least one mounting component coupled to and extending laterally from the body. In some instances, the frost sensor is coupled to evaporator coils of a cooling system.

    Combustion air blower with embossed housing

    公开(公告)号:US12092369B2

    公开(公告)日:2024-09-17

    申请号:US17553421

    申请日:2021-12-16

    CPC classification number: F24H9/0068 F23D14/70 F24H9/0073

    Abstract: A combustion air blower includes a blower housing, an impeller fan within the blower housing, and an embossment to restrict airflow from the combustion air blower. The blower housing has a discharge conduit defining a discharge passageway. The discharge conduit is adapted and configured to receive a baffle such that, when the baffle is received, the baffle extends inwardly into the discharge passageway from a first wall towards a second wall opposite the first wall. The baffle restricts airflow within the discharge passageway. The embossment is in the discharge passageway and in the second wall and extends towards the first wall such that the embossment restricts airflow within the discharge passageway. The embossment cooperates with a baffle to provide a reduced cross sectional area of the discharge passageway in comparison to an upstream portion.

    Systems and methods for hybrid drive control for an electric motor

    公开(公告)号:US12074549B2

    公开(公告)日:2024-08-27

    申请号:US18464060

    申请日:2023-09-08

    CPC classification number: H02P27/06 H02P25/22

    Abstract: A motor controller for an electric motor is provided. The motor controller includes a voltage limiting circuit configured to be coupled to an alternating current (AC) source and is configured to limit a voltage at an output node of the AC source, a filter configured to be coupled to the AC source and is configured to produce a filtered line frequency AC signal, a rectifier coupled to the filter and configured to produce a direct current (DC) signal from the filtered line frequency AC signal, an inverter coupled to the rectifier and configured to produce an AC signal on an input node of the electric motor, and a line contactor coupled between the AC source and the input node of the electric motor and configured to supply the input node of the electric motor directly from the AC source to energize stator windings therewith when the inverter is disabled.

    INTERCHANGEABLE MODULAR CUTOFF FOR CENTRIFUGAL BLOWERS

    公开(公告)号:US20240035485A1

    公开(公告)日:2024-02-01

    申请号:US18364093

    申请日:2023-08-02

    CPC classification number: F04D29/422 F04D29/4226

    Abstract: A centrifugal blower assembly including a blower housing having a scroll wall defining a blower chamber, the scroll wall extending circumferentially between a cutoff point to an end point defining a blower circumference, the blower housing further having a surface adjacent to the cutoff point; and a modular cutoff configured to attach to the surface of the blower housing, the modular cutoff having an abutting surface and a cutoff surface configured to extend the cutoff point of the blower by the cutoff surface to an extended cutoff surface. The abutting surface of the modular cutoff further includes an attachment feature configured to mate to an attachment feature of the blower housing.

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