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1. 发明专利

GB2607662A Controlling brushless motor commutation 未知
公开(公告)号：GB2607662A
公开(公告)日：2022-12-14
申请号：GB202203888
申请日：2022-03-21
申请人： SNAP ON INCORPORATED
发明人： JASON GENZ , MICHAEL T RAJZER , CHRISTOFFER S FOX
IPC分类号： H02P6/15 , H02P6/08 , H02P23/28 , H02P27/08
摘要： A method of commutation control of a brushless DC (BLDC) motor 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. The motor is controlled using overlapped commutation by controlling first high-side and first low-side switches corresponding to a first phase of the motor; controlling second high-side and second low-side switches corresponding to a second phase of the motor; and controlling third high-side and third low-side switches corresponding to a third phase of the motor; wherein during at least one step of the overlapped commutation, the first, second, and third phases of the motor are active. The method may be used for a tool, for example, motorized ratchet wrenches, drills and drivers.

2. 发明专利

GB2607663A Current pulse limiting protection 未知
公开(公告)号：GB2607663A
公开(公告)日：2022-12-14
申请号：GB202203890
申请日：2022-03-21
申请人： SNAP ON INCORPORATED
发明人： MICHAEL T RAJZER , JASON GENZ
IPC分类号： B25B21/00 , B25F5/00 , H02P6/24 , H02P29/02
摘要： A method 200 of operating a controller (116, Figure 2) and a motor 114, operably coupled to a power source 120 which is adapted to supply power to the motor, includes measuring current 204 flowing from the power source through the controller to the motor. A number of current pulses are counted 208 in the current flowing from the power source through the controller to the motor. The power source is caused to stop supplying power to the motor 212 when the number of current pulses meets or exceeds a pulse threshold 210. A tool including a power source adapted to supply power to a motor includes a controller adapted to measure current flowing from the power source through the controller to the motor; count a number of current pulses; and cause the power source to stop supplying power to the motor when the number of current pulses meets or exceeds a pulse threshold. The controller may implement current pulse limit protection to protect the controller and power source, such as a battery, from damage due to overcurrent pulse events. An indicator may be activated when the pulse threshold is met or exceeded.

3. 发明专利

GB2607404A Short circuit protection for a BLDC motor 未知
公开(公告)号：GB2607404A
公开(公告)日：2022-12-07
申请号：GB202203887
申请日：2022-03-21
申请人： SNAP ON INCORPORATED
发明人： MICHAEL T RAJZER , JASON GENZ
IPC分类号： B25B21/00 , B25F5/00 , H02P6/08
摘要： A tool (100, Figure 1) includes switching elements (124, Figure 3) and a power source (120, Figure 2) to supply a motor 114. A controller 116 is adapted to individually activate and deactivate the switching elements and measure a first current corresponding to at least one of the switching elements when activated. A short circuit fault is indicated when the measured first current meets or exceeds a first threshold current. The controller may perform a bootstrap capacitor charging process by activating low-side switching elements. A method 200 for operating a brushless DC motor having switching elements and powered by a power supply includes individually activating and deactivating the switching elements 204. A first current is then measured 206 corresponding to at least one of the switching elements when activated. A short circuit fault is indicated 214 when the measured first current meets or exceeds a first threshold current 208. A controller for a brushless DC motor with switching elements has a processing unit to perform a first short circuit check including activating first and second switching elements; measuring first and second currents; deactivating the switching elements; indicating a fault when the measured currents meet or exceed a first threshold current.

4. 发明专利

GB2607664A Overcurrent protection for electric motor 未知
公开(公告)号：GB2607664A
公开(公告)日：2022-12-14
申请号：GB202203892
申请日：2022-03-21
申请人： SNAP ON INCORPORATED
发明人： MICHAEL T RAJZER , JASON GENZ , CHRISTOFFER S FOX
IPC分类号： H02H3/08 , H02H3/087
摘要： 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. The accumulated thermal energy is determined by repeatedly using the formula current*current*time (I2t) at every time interval.

5. 发明专利

GB2605278A Motor timeout in power tool 未知
公开(公告)号：GB2605278A
公开(公告)日：2022-09-28
申请号：GB202203909
申请日：2022-03-21
申请人： SNAP ON INCORPORATED
发明人： MICHAEL T RAJZER , JASON GENZ , DAVID A CYBORSKI
IPC分类号： B25F5/00 , H02H3/027
摘要： A method 200 of operating a power tool (100, figure 1) includes determining 206 whether power is being supplied to the motor by the power source, and if power is being supplied to the motor, initiating 208 a timer. The power supplied to the motor is stopped 214 when the timer meets or exceeds a threshold. This reduces the chance of the power source being unintentionally discharged, and the chance of the tool causing damage to the storage mechanism or other surroundings when a trigger of the tool is unintentionally actuated. The method may further include an indicator of the tool being activated 216 when the motor timer reaches the threshold and starting an indicator timer. The method may further include, before starting the motor timer, determining 202 whether the trigger is actuated and if it remains actuated after the power is cut off from the motor. The invention also envisages a tool that performs the above method, comprising a motor, power source, and a controller.

6. 发明专利

GB2607403A Controlling a brushless motor 未知
公开(公告)号：GB2607403A
公开(公告)日：2022-12-07
申请号：GB202203881
申请日：2022-03-21
申请人： SNAP ON INCORPORATED
发明人： MICHAEL T RAJZER , JASON GENZ , DANIEL NITZSCHE
IPC分类号： H02P6/16 , H02H7/08
摘要： Commutation control of a brushless DC (BLDC) motor for use with, for example, a power tool 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. Signals are received from a position sensor respectively corresponding to transitions between first and second states of the position sensor, wherein the signals are used to indicate a position of the rotor. An amount of time between successive transitions is measured, and a transition time estimate is determined based on the measured amount of time. Commutation of the rotor is controlled using the transition time estimate when the position sensor fails. The method may be used for a power tool, for example motorized ratchet wrenches, drills and drivers.

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