公开(公告)号：US20220305603A1

公开(公告)日：2022-09-29

申请号：US17694218

申请日：2022-03-14

Applicant: Snap-on Incorporated

Inventor： Michael T. Rajzer ,  Jason Genz ,  David A. Cyborski ,  Jeremy Zorns ,  Christoffer S. Fox ,  Patrick F. Healy

IPC: B23Q17/09 ,  B25F5/00 ,  B25F5/02

Abstract: The present invention relates to a motor timeout of a power tool. When a trigger of the tool is unintentionally actuated, power is provided to a motor of the tool to cause an output assembly of the tool to operate. This can be problematic when the tool is being stored. To address this situation, the tool initiates or starts a motor timer when the motor is running at any nonzero speed. If the trigger remains continuously actuated, with the motor running at any nonzero speed, and the motor timer reaches a threshold limit, the tool ceases or discontinues to allow power to be provided to the motor, thereby shutting off the motor. This reduces the power source from being unintentionally discharged, and the chance of the tool creating a situation where the output assembly can unintentionally cause damage to the storage mechanism or other surroundings.

公开(公告)号：US20220311365A1

公开(公告)日：2022-09-29

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

Abstract: The present invention relates to a method of commutation control of a 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.

公开(公告)号：US20220311237A1

公开(公告)日：2022-09-29

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

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.

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.

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.