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    LOW-SPEED SENSORLESS BRUSHLESS MOTOR CONTROL IN A POWER TOOL
    2.
    发明申请
    LOW-SPEED SENSORLESS BRUSHLESS MOTOR CONTROL IN A POWER TOOL 审中-公开

    公开(公告)号：US20200343839A1

    公开(公告)日：2020-10-29

    申请号：US16853090

    申请日：2020-04-20

    申请人： Black & Decker Inc.

    发明人： Shailesh P. WAIKAR ,  Zhi QU ,  Wing LIN

    IPC分类号： H02P6/182 ,  H02P6/17 ,  B25D11/06

    摘要： A power tool is provided including a brushless motor having a stator defining a plurality of phases, a rotor rotatable relative to the stator, and power terminals electrically connected to the phases of the motor. A power unit is provided including power switches. A control unit is interfaced with the power unit to output a drive signal to one or more of the motor switches to drive the phases of the motor over a series of sectors of the rotor rotation. The control unit is configured detect incorrect rotation of the rotor by applying a first series of voltage pulses to a present sector and a second series of voltage pulses to a previous sector, measuring motor currents associated with the first and second series of voltage pulses, and comparing corresponding motor current measurements to detect a transition from the present sector to the previous sector.

    OVERMOLDED ROTOR STRUCTURE
    3.
    发明公开
    OVERMOLDED ROTOR STRUCTURE 审中-公开

    公开(公告)号：US20240364159A1

    公开(公告)日：2024-10-31

    申请号：US18769844

    申请日：2024-07-11

    申请人： Black & Decker Inc.

    发明人： Tong ZHENG ,  Yeli GU ,  Fulong LIU ,  Changxing LU ,  Abraham SANCHEZ ,  Shailesh P. WAIKAR ,  David J. SMITH

    IPC分类号： H02K1/30 ,  H02K1/2733 ,  H02K7/14 ,  H02K15/03 ,  H02K29/00

    CPC分类号： H02K1/30 ,  H02K1/2733 ,  H02K7/145 ,  H02K15/03 ,  H02K29/00

    摘要： A brushless direct-current (BLDC) motor is provided. The motor includes a stator including a stator core, stator teeth, and windings; a rotor shaft disposed within the stator and extending along a longitudinal axis; and a rotor. The rotor includes a rotor core including a body extending around the longitudinal axis, a permanent magnet mounted on the body of the rotor core, and a mold structure formed at least partially through the rotor core. In an embodiment, the mold structure engages two axial ends of the permanent magnet to axially retain the permanent magnet relative to the rotor core and integrally forms a fan adjacent the rotor core. In an embodiment, the permanent magnet includes at least one tooth extending from an axial end thereof and having angled side edges, and the mold structure engages the at least one tooth to fixedly secure the permanent magnet to the rotor core.

    LOW-SPEED SENSORLESS BRUSHLESS MOTOR CONTROL IN A POWER TOOL
    4.
    发明申请
    LOW-SPEED SENSORLESS BRUSHLESS MOTOR CONTROL IN A POWER TOOL 有权

    公开(公告)号：US20220329180A1

    公开(公告)日：2022-10-13

    申请号：US17846485

    申请日：2022-06-22

    申请人： Black & Decker Inc.

    发明人： Shailesh P. WAIKAR ,  Zhi QU ,  Wing LIN ,  John C. VANKO

    IPC分类号： H02P6/182 ,  H02P6/17 ,  B25D11/06 ,  B25F5/02 ,  H02P6/06 ,  H02P6/18

    摘要： A control unit for a brushless DC motor of a power tool having a rotor and a stator is provided. The control unit detects an initial position of the rotor, commutates the motor beginning at the initial position of the rotor using a low-speed motor commutation scheme until an output speed of the rotor exceeds a speed threshold, and commutates the motor based on a back-electromotive force (back-EMF) voltage of the motor after the output speed of the rotor exceeds the speed threshold. In the low-speed commutation scheme, the control unit applies a first set of voltage pulses to a present sector and a second set of voltage pulses to a next sector, and detects a transition of the rotor from the present sector to the next sector based on motor current measurements associated with the first set of voltage pulses and the second set of voltage pulses.