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    CONTROLLING A BRUSHLESS MOTOR
    3.
    发明申请
    CONTROLLING A BRUSHLESS MOTOR 有权

    公开(公告)号：US20240388226A1

    公开(公告)日：2024-11-21

    申请号：US18789892

    申请日：2024-07-31

    Applicant: Snap-on Incorporated

    Inventor： Michael T. Rajzer ,  Jason Genz ,  Daniel Nitzsche

    IPC: H02P6/12 ,  B25B21/00 ,  H02P6/15 ,  H02P6/16

    Abstract: The present invention relates broadly to commutation control of a BLDC motor for use with, for example, a power tool. The method uses a controller to control a BLDC motor in the event of a position sensor failure. Rather than ceasing operation of the motor and indicating a fault or error message to the user, the present invention determines when the next transition should occur based on the time between past hall transitions using a timer. Thus, if one or two position sensors are no longer providing position information to the controller, the controller can determine when the transitions would be changing based on past transitions to continue controlling the motor and prevents the motor from ceasing operation.

    SHORT CIRCUIT PROTECTION FOR A BLDC MOTOR
    5.
    发明申请
    SHORT CIRCUIT PROTECTION FOR A BLDC MOTOR 有权

    公开(公告)号：US20220311372A1

    公开(公告)日：2022-09-29

    申请号：US17694249

    申请日：2022-03-14

    Applicant: Snap-on Incorporated

    Inventor： Michael T. Rajzer ,  Jason Genz

    IPC: H02P29/024 ,  B25B21/00 ,  G01R31/34 ,  H02K7/14

    Abstract: The present invention relates to switching element protection of a BLDC motor, such as used with a power tool. The present invention checks each switching element of a power stage individually for a short circuit when a trigger of the tool is actuated. Each switching element is turned ON for a period of time (such as 1-5 microseconds, for example), current flowing through the half-bridge or the full power stage is measured, and that switching element is turned OFF. When the current is greater than or equal to a threshold (such as 5 A, for example), the controller stops and indicates a fault condition. By testing each switching element in order, the controller is able to determine whether the shorted switching element is the opposite one in the half-bridge being tested.

    Controlling brushless motor commutation
    7.
    发明授权
    Controlling brushless motor commutation 有权

    公开(公告)号：US12101051B2

    公开(公告)日：2024-09-24

    申请号：US17694260

    申请日：2022-03-14

    Applicant: Snap-on Incorporated

    Inventor： Jason Genz ,  Michael T. Rajzer ,  Christoffer S. Fox ,  Daniel Nitzsche

    IPC: H02P6/15 ,  B25B21/00

    CPC classification number: H02P6/153 ,  B25B21/004

    Abstract: The present invention relates to a method of commutation control of a brushless DC (BLDC) motor. The method uses a controller to control the BLDC motor using a modified six-step commutation. The method adds six intermediate steps that overlap the six-step commutation. Each of the six steps overlap with preceding and following steps, resulting in six additional intermediate steps in which all three phases are active. By doubling the number of steps, current and torque will vary less over time compared with current solutions without increasing the size or changing the design of the motor.

    Overcurrent protection for electric motor
    8.
    发明授权
    Overcurrent protection for electric motor 有权

    公开(公告)号：US12095255B2

    公开(公告)日：2024-09-17

    申请号：US17694242

    申请日：2022-03-14

    Applicant: Snap-on Incorporated

    Inventor： Michael T. Rajzer ,  Jason Genz ,  Christoffer S. Fox

    IPC: H02H7/08 ,  B25B21/00

    CPC classification number: H02H7/0844 ,  B25B21/004

    Abstract: Overcurrent protection of an electrically powered, motorized device, such as a power tool, wherein the tool includes a tool housing, an output assembly, a trigger, an electrical safety device, a motor, an indicator, a controller, and a power source. The electrical safety device, for example a fuse, is disposed in series with a power connection from the power source to the controller. The controller measures current passing through the electrical safety device in time intervals when the trigger is actuated. The controller determines accumulated thermal energy passing through the electrical safety device, and compares the accumulated thermal energy to a threshold. If the accumulated thermal energy exceeds the threshold, the controller ceases or discontinues to allow power to be provided to the motor from the power source, thereby shutting off the motor. The controller may also activate the indicator to indicate a fault to the user.

    CURRENT PULSE LIMITING PROTECTION
    10.
    发明申请
    CURRENT PULSE LIMITING PROTECTION 有权

    公开(公告)号：US20220311235A1

    公开(公告)日：2022-09-29

    申请号：US17694267

    申请日：2022-03-14

    Applicant: Snap-on Incorporated

    Inventor： Michael T. Rajzer ,  Jason Genz

    IPC: H02H7/08 ,  H02H1/00

    Abstract: The present invention relates to current pulse limiting protection of a motorized device that includes a motor, a controller, and a power source (such as a battery). The controller implements current pulse limit protection to protect the controller and battery from damage due to overcurrent pulse events. For example, the controller may measure current flowing through the controller, and detect a number of current pulses that meets or crosses a first current threshold, regardless of a duration of each of the current pulses. The controller counts each current pulse that meets or crosses the first current threshold, and if the number of current pulses counted meets or exceeds a threshold number of pulses, the controller indicates a fault and ceases operation of the tool to protect the controller and battery from damage.

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