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    Waveform shaping in power tool powered by alternating-current power supply
    2.
    发明授权
    Waveform shaping in power tool powered by alternating-current power supply 有权

    公开(公告)号：US11173584B2

    公开(公告)日：2021-11-16

    申请号：US16454837

    申请日：2019-06-27

    申请人： Black & Decker Inc.

    发明人： Alexander Manasseh ,  Scott J. Eshleman ,  Robert A. Usselman ,  John D. Cox

    IPC分类号： B25B21/00 ,  H02P6/00 ,  H02P23/26 ,  H02P6/15 ,  H02P6/32 ,  B23B45/02 ,  H02P6/08 ,  H02P6/20 ,  H02P6/24

    摘要： A power tool is provided including a brushless DC (BLDC) motor, a rectifier that receives an alternative current from a power supply and outputs a rectified signal supplied to a DC power bus, and an inverter circuit having motor switches connected electrically between the DC power bus and the motor. A control module controls a switching operation of the power switches to regulate supply power from the power supply to the motor. The control module controls the switching operation so as to, within a half cycle of the AC power supply voltage waveform, increase current draw from the power supply from a first threshold at or after a first zero-crossing of the half cycle up to a second threshold, and reduce current draw from the power supply from the second threshold up to a third threshold at or prior to a second zero-crossing of the half cycle.

    SYNCHRONOUS MOTOR DRIVE SYSTEM AND SYNCHRONOUS MOTOR DRIVE METHOD
    4.
    发明申请
    SYNCHRONOUS MOTOR DRIVE SYSTEM AND SYNCHRONOUS MOTOR DRIVE METHOD 审中-公开

    公开(公告)号：US20200259439A1

    公开(公告)日：2020-08-13

    申请号：US16857023

    申请日：2020-04-23

    申请人： SYSTEM HOMES COMPANY, LTD.

    发明人： Hozo Yoshino

    IPC分类号： H02P23/30 ,  H02P23/26 ,  H02P27/04 ,  H02P27/08

    摘要： The present disclosure is constructed on the prior art inverter architecture, a pulse code width modulation (PCWM). This is an open loop motor control system without sensing its rotor position. The present disclosure employs a closed loop method to track the optimum efficiency motor operating point directly. A bench load test is conducted to gather information for an AI type control, which includes both load angle vs. voltage command charts and power factor vs. voltage command charts, with load levels as parameters for certain frequency command ranges. This way, the optimum efficiency motor operating points are generated a priori. The AI type control is mechanized to track the optimum efficiency motor operating points.

    MOTOR AND CONTROL DEVICE THEREOF
    5.
    发明申请
    MOTOR AND CONTROL DEVICE THEREOF 审中-公开

    公开(公告)号：US20200099327A1

    公开(公告)日：2020-03-26

    申请号：US16465685

    申请日：2017-11-24

    申请人： Masayuki NASHIKI

    发明人： Masayuki NASHIKI

    IPC分类号： H02P23/26

    摘要： A motor is provided with stator windings arranged on a circumference of stator. Multiple-phase currents are supplied to the stator windings. A current is supplied to rotor windings. The multiple-phase currents include torque current components, which are arranged to be opposite in directions to torque current components of the current. By this mutually opposite-directional current arrangement, a sum of both torque current components results in a magnetomotive force of zero. It is also possible to reduce influence of the torque current components on the field magnetic fluxes of the motor. In the motor, circumferential magnetic flux components can be concentrated on an airgap and a portion near therearound, so that a larger amount of torque can be obtained, and constant output control can be performed more easily.

    AC POWER ADAPTER HAVING A SWITCHABLE CAPACITOR
    7.
    发明申请
    AC POWER ADAPTER HAVING A SWITCHABLE CAPACITOR 审中-公开

    公开(公告)号：US20200036308A1

    公开(公告)日：2020-01-30

    申请号：US16591938

    申请日：2019-10-03

    申请人： Black & Decker Inc.

    发明人： Pradeep M. Pant

    IPC分类号： H02P6/28 ,  H02P23/26 ,  H02P6/08 ,  H02P29/024 ,  H02K7/14 ,  H02M7/219 ,  H02M7/12 ,  H01M2/10 ,  H02J7/00 ,  H02J7/02 ,  H02J7/04 ,  H02P29/032 ,  H02P25/14 ,  H02P27/08

    摘要： A power adapter is provided to supply electric power from an alternating current from an alternating current (AC) power supply to a powered apparatus. It includes a switchable capacitor circuit housed within a housing and including a switchable capacitor switchably coupled across the AC power supply and a H-bridge circuit including four switches. An OFF-state of the four switches creates a charging path for the switchable capacitor, an ON-state of a first pair of the four switches creates a discharge path for the switchable capacitor during a positive half cycle of the alternating current, and an ON-state of a second pair of the four switches creates a discharge path for the switchable capacitor during a negative half cycle of the alternating current.

    Induction Motor Health Monitoring Method
    8.
    发明申请
    Induction Motor Health Monitoring Method 审中-公开

    公开(公告)号：US20200021221A1

    公开(公告)日：2020-01-16

    申请号：US16364531

    申请日：2019-03-26

    申请人： Parker-Hannifin Corporation

    发明人： Eric Polcuch ,  Bradley Conn

    IPC分类号： H02P23/26 ,  H02P23/00 ,  H02P23/14

    摘要： A system and method for determining the health of a motor drive system is provided, where a motor is coupled to a common motor control and a single or plurality of other motors are coupled to the common power source. Current data corresponding to current provided to the motor is obtained via a sensor connected to an electrical input of the motor, and voltage data corresponding to a voltage provided by the common motor control is also obtained. Based on the current data and the voltage data, a motor current provided to the motor and a motor voltage to current phase shift (or power factor) are determined, and the health of the motor drive system is determined from the motor phase shift (or power factor) and the motor current.

    Method to drive a power control device connected to unbalanced three-phase loads when no neutral reference is available in an alternative electrical network
    10.
    发明授权
    Method to drive a power control device connected to unbalanced three-phase loads when no neutral reference is available in an alternative electrical network 有权

    公开(公告)号：US10461537B2

    公开(公告)日：2019-10-29

    申请号：US15846486

    申请日：2017-12-19

    申请人： EUROTHERM LIMITED

    发明人： Remi Cabaussel

    IPC分类号： H02J3/18 ,  H02P23/26 ,  H02J3/26

    摘要： A method for operating an unbalanced load manager for a three-phase induction motor or heater, includes receiving, by a load manager, values representative of current flow sensed by current sensors and voltages sensed by voltage taps corresponding to phases of a three-phase power system providing power to the motor or heater. The method includes detecting, by the load manager, a transition from positive or negative to zero current, to measure a phase shift between line-to-line and current. The method further includes synchronizing, by the load manager, firing from line-to-line signal to line-to-neutral signal of phases of the three-phase power system, using the measured phase shift between line-to-line and current.