Power tool with sensor board and display

Abstract

A power tool comprises a housing, a motor mounted in the housing (the motor comprising a stator and a rotor), and a printed circuit board assembly mounted in the housing, the printed circuit board assembly comprising a sensor designed to detect rotation of the rotor and a display assembly. The display assembly is designed to display an operating parameter of the power tool.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U.S. Provisional Patent Application No. 63 / 520223, filed August 17, 2023, the entire contents of which are incorporated herein by reference. BACKGROUND

[0002] The present disclosure relates to power tools and, more particularly, to power tools having indicators such as mode indicators. SUMMARY

[0003] In some aspects, the methods described herein relate to a power tool comprising: a housing; a motor supported within the housing, the motor comprising a stator and a rotor; and a circuit board assembly supported within the housing, the circuit board assembly comprising a sensor configured to detect rotation of the rotor and a display assembly, the display assembly configured to display an operating parameter of the power tool.

[0004] In some aspects, the methods described herein relate to a power tool further comprising: a controller configured to control operation of the motor according to a selected one of a plurality of operating modes; and an actuator, wherein the controller is configured to switch the selected operating mode between the plurality of operating modes in response to actuation of the actuator, and wherein the controller is configured to control the display assembly to display the selected operating mode.

[0005] In some aspects, the methods described herein relate to a power tool, wherein the controller is configured to switch the selected operating mode between the plurality of operating modes in response to the actuating member being actuated in a first manner, and wherein the controller is configured to control the motor according to the selected operating mode in response to the actuating member being actuated in a second manner different from the first manner.

[0006] In some aspects, the methods described herein relate to a power tool wherein the actuating element is a trigger supported by the housing.

[0007] In some aspects, the methods described herein relate to a power tool wherein the housing has a handle portion, and wherein the trigger is disposed on the handle portion.

[0008] In some aspects, the methods described herein relate to a power tool further comprising a gear assembly driven by the motor, wherein the circuit board assembly is disposed between the stator and the gear assembly.

[0009] In some aspects, the methods described herein relate to a power tool wherein the circuit board assembly is coupled to the stator.

[0010] In some aspects, the methods described herein relate to a power tool, wherein the circuit board assembly is a first circuit board assembly, and wherein the power tool further comprises a second circuit board assembly, wherein the second circuit board assembly has a plurality of switching elements configured to power the motor.

[0011] In some aspects, the methods described herein relate to a power tool, wherein the sensor is a Hall effect sensor.

[0012] In some aspects, the methods described herein relate to a power tool wherein the display assembly includes a light source mounted on the circuit board assembly.

[0013] In some aspects, the methods described herein relate to a power tool, wherein the display assembly includes a light output configured to output a visible light generated by the light source and a light guide configured to transmit the visible light from the light source to the light output.

[0014] In some aspects, the methods described herein relate to a power tool wherein the light output and the light guide are integrally formed together as a single light output body, and wherein the indicator assembly further includes a seal disposed between the light output body and the housing. 13.

[0015] In some aspects, the methods described herein relate to a power tool comprising: a housing; a motor supported in the housing, the motor including a stator and a rotor having an output shaft rotatable about an axis; a gear assembly supported in the housing and coupled to the output shaft, the gear assembly including a ring gear; a circuit board assembly supported in the housing between the stator and the ring gear in a direction along the axis, the circuit board assembly including a display assembly having a light source mounted on the circuit board assembly and configured to display an operating parameter of the power tool.

[0016] In some aspects, the methods described herein relate to a power tool, further comprising

[0017] In some aspects, the methods described herein relate to a controller configured to control operation of the engine according to a selected one of a plurality of operating modes; and

[0018] In some aspects, the methods described herein relate to an actuator.

[0019] In some aspects, the methods described herein relate to, wherein the controller is configured to switch the selected operating mode between the plurality of operating modes in response to an actuation of the actuating element, and

[0020] In some aspects, the methods described herein relate to, wherein the controller is configured to control the display assembly to display the selected operating mode.

[0021] In some aspects, the methods described herein relate to a power tool, wherein the light source is one of a plurality of light sources mounted on the circuit board assembly.

[0022] In some aspects, the methods described herein relate to a power tool, wherein the display assembly includes a light output configured to output a visible light generated by the light source, wherein the housing includes a battery receptacle, and wherein the light output is disposed on a top surface of the housing opposite the battery receptacle.

[0023] In some aspects, the methods described herein relate to a power tool, wherein the display assembly includes a light guide configured to transmit the visible light from the light source to the light output.

[0024] In some aspects, the methods described herein relate to a power tool wherein the light output comprises a lens.

[0025] In some aspects, the methods described herein relate to a power tool wherein the light output and the light guide are integrally formed together as a single light output body, and wherein the indicator assembly further comprises a seal disposed between the light output body and the housing.

[0026] In some aspects, the methods described herein relate to a power tool comprising: a housing; a motor supported within the housing, the motor including a stator and a rotor; a circuit board assembly supported within the housing and coupled to the stator, the circuit board assembly including a display assembly having a light source mounted on the circuit board assembly and configured to display an operating parameter of the power tool. 26.

[0027] Before embodiments are explained in more detail, it is to be understood that the embodiments are not limited in their application to the details of the design and arrangement of components set forth in the following description or illustrated in the accompanying drawings. The embodiments may be practiced or carried out in a variety of ways. Further, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be considered limiting. The use of "comprising" or "having" / "with" and variations thereof is intended to include the elements listed thereafter and their equivalents as well as additional elements.

[0028] Furthermore, it should be understood that embodiments may include hardware, software, and electronic components or modules, which for purposes of illustration may be illustrated and described as if the majority of the components were implemented solely in hardware. However, one of ordinary skill in the art, based on a reading of this detailed description, would recognize that, in at least one embodiment, the electronic-based aspects may be implemented in software (e.g., stored on a non-transitory computer-readable medium) that may be executed by one or more processing units, such as a microprocessor and / or application-specific integrated circuits ("ASICs"). Thus, it should be appreciated that multiple hardware- and software-based devices, as well as multiple different structural components, may be used to implement the embodiments.For example, "servers" and "computing devices" described in the specification may include one or more processing units, one or more computer-readable media modules, one or more input / output interfaces, and various connections (e.g., a system bus) that connect the components.

[0029] Although certain drawings depict hardware and software residing within particular devices, it should be understood that these images are for illustrative purposes only. Functions performed by one component in the present description may be performed by multiple components in a distributed manner. Likewise, functions performed by multiple components may be consolidated and performed by a single component. In some embodiments, the depicted components may be combined or separated into separate software, firmware, and / or hardware. For example, rather than residing and being executed by a single electronic processor, logic and processing may be distributed among multiple electronic processors.Similarly, a component described as performing certain functions may also perform additional functions not described herein. For example, a device or structure "configured" in a particular manner is at least configured in that manner, but may also be configured in ways not explicitly stated.

[0030] Other features and aspects of the disclosure will become apparent upon consideration of the following detailed description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view of a power tool according to an embodiment of the present disclosure. Fig. 2 is a cross-sectional view of the power tool of Fig. 1 along line 2-2 in Fig. 1. Fig. 3 is a partial perspective view of the power tool of Fig. 1 with hidden sections to illustrate a sensor board assembly. Fig. 4 is an enlarged perspective view showing a portion of the sensor board assembly of Fig. 3. Fig. 5 is a block diagram illustrating aspects of the power tool of Fig. 1. DETAILED DESCRIPTION

[0031] Fig. 1 shows a power tool 210 in the form of an impact wrench. The illustrated power tool 210 includes a housing 214 with a motor housing portion 218, an impact housing or front housing portion 222 coupled to the motor housing portion 218, and a handle portion 226 extending from the motor housing portion 218. The handle portion 226 and the motor housing portion 218 are defined by a first folding half 228a and a cooperating second folding half 228b, which are coupled to one another at an interface or seam 231. In other embodiments, however, the housing 214 may be constructed differently. In the illustrated embodiment, the handle portion 226 includes a battery receptacle 236 to which a battery pack (for example, a rechargeable power tool battery pack; not shown) can be coupled.The battery receptacle 236 has a battery pack interface 238 with electrical contacts or terminals to provide an electrical connection between the battery pack and the power tool 210.

[0032] As in Fig. 2, a motor 242, which in the illustrated embodiment is a brushless DC electric motor, is mounted within the motor housing portion 218 and includes a stator 246 and a rotor having an output shaft 250 rotatable about an axis 254 relative to the stator 246. The stator 246 includes, for example, conductive windings that selectively receive power from the battery pack. The rotor includes, for example, laminations and one or more permanent magnets coupled for rotation with the output shaft 250. The illustrated motor 242 is an inrunner, with the stator 246 surrounding the rotor and output shaft 250. However, in other embodiments, the motor 242 may be an outrunner.

[0033] The illustrated power tool 210 further includes an actuating element in the form of a trigger 262 mounted in the handle portion 226 of the housing 214. The trigger 262 includes a trigger switch 261 that can be actuated to variably control at least one parameter of the power tool 210. In some embodiments, the at least one parameter may include an amount of energy supplied to the motor 242 (e.g., to activate and deactivate the motor 242 and / or to vary an operating speed of the motor 242). In some embodiments, the at least one parameter may include an operating mode of the power tool 210, as described in more detail below. The illustrated power tool 210 also includes a work light assembly 289 ( Fig. 3) to illuminate a workpiece in response to the actuation of the trigger 262.

[0034] What next regarding Fig. 2, the illustrated power tool 210 includes a gear assembly 266 driven by the output shaft 250 and an impact mechanism or drive assembly 270 coupled to an output of the gear assembly 266. The illustrated gear assembly 266 includes a pinion gear 282 coupled to the output shaft 250 of the motor 242, a plurality of planetary gears 286 meshing with the pinion gear 282, and a ring gear 290 meshing with the planetary gears 286 and rotatably mounted in the housing 214. The gear assembly 266 is housed in a gear housing 274, which in the illustrated embodiment is defined by the ring gear 290, the front housing portion 222, and a sleeve 275 extending between and engaging the ring gear 290 and the front housing portion 222.

[0035] The illustrated ring gear 290 is positioned between a first wall 313, which may also be referred to as a partition wall, and a second wall 229. The first wall 313 and the second wall 229 are together defined by the two folding halves 228a, 228b, respectively. The first wall 313 separates the interior of the transmission housing 274 from the motor 242. The second wall 229 forms a dome that receives a screw (not shown) for connecting the folding halves 228a, 228b. In some embodiments, the ring gear 290 is axially clamped by the first and second walls 313. In some embodiments, the ring gear 290 is additionally or alternatively axially clamped by an annular web 297 formed on the inner sides of the folding halves 228a, 228b and seated in a corresponding circumferential outer groove of the ring gear 290.

[0036] In the illustrated embodiment, the ring gear 290 is thus directly supported by the folding halves 228a, 228b. This allows the ring gear 290 to have a larger diameter within a given size of the housing 214 than if the ring gear 290 were housed in a separate gear housing within the housing 214. Therefore, the ring gear 290 may have an outer diameter that exceeds an inner diameter of the front housing portion 222 in some embodiments.

[0037] How to continue in Fig. 2, the drive assembly 270 of the illustrated power tool 210 includes a camshaft 294, an anvil 326 (which may also be referred to as an output device) to which a tool bit (e.g., a socket, etc.) can be coupled for performing a job (e.g., applying torque) on a workpiece (e.g., a fastener), a hammer 330 configured to reciprocate along the camshaft 294 and impart periodic rotational impacts to the anvil 326, and a hammer spring 334 that biases the hammer 330 toward the anvil 326 and stores energy as the hammer 330 moves away from the anvil 326 along the camshaft 294.

[0038] As now in Fig. 3-4, in the illustrated embodiment, a first printed circuit board assembly (LPA) 263 is provided adjacent a front end of the motor 242. Accordingly, the LPA 263 is disposed between the stator 246 and the ring gear 290 in a direction along the axis 254. The first LPA 263 is coupled to a front end of the stator 246 (e.g., via threaded fasteners), but in other embodiments, may be directly coupled to the housing 214. The illustrated LPA 263 includes an annular portion 263a, an upper arcuate portion 263b, and a lower arcuate portion 263c. The upper arcuate portion 263b and the lower arcuate portion 263c are each coupled to the annular portion 263a via two legs 263d. ( Fig. 4). The output shaft 250 of the motor 242 extends centrally through the annular portion 263a.

[0039] As in Fig. As shown in Figure 4, the annular portion 263a carries one or more Hall-effect sensors 264 (for example, three sensors 264 in the illustrated embodiment) that provide feedback for controlling the motor 242 (for example, by sensing the rotation of one or more permanent magnets in the rotor). The first LPA 263 may therefore be referred to as a sensor board assembly.

[0040] As in Fig. 4, in the illustrated embodiment, the first LPA 263 further includes a display assembly 362 configured to display an operating parameter of the power tool 210. In some embodiments, the operating parameter may be an operating mode setting of the power tool 210. That is, the display assembly 362 may indicate to a user of the power tool 210 which of a plurality of operating modes is currently selected. The operating parameter may additionally or alternatively include one or more sensor-detected values ​​(such as motor torque, output torque, motor speed, output speed, number of output revolutions, duty cycle, motor current, battery voltage, battery life, etc.), one or more set values ​​(such as target output torque, target output speed, target number of output revolutions, etc.), or other information (such as required maintenance, error codes, etc.).

[0041] How to continue in Fig. 4, the illustrated display assembly 362 includes a plurality of light sources 364 (e.g., LEDs mounted on the substrate of the LPA 263) and a plurality of light outputs 366 (e.g., lenses, diffusers, etc.) configured to emit visible light generated by the respective light sources 364. The illustrated display assembly 362 includes four light sources 364 and four corresponding light outputs 366, but the number of light sources 364 and light outputs 366 may vary (e.g., one, two, three, etc.). The light sources 364 may include single-color or multi-color (e.g., RGB, RGBW, etc.) LEDs. In other embodiments, other types of light sources 364 may be used. In still other embodiments, the display assembly 362 may include a display such as an LCD display, E-Ink display, or the like, which may optionally be backlit.

[0042] In the illustrated embodiment, the light sources 364 are mounted on the upper arcuate portion 263b of the first LPA 263, and the light outputs 366 are optically coupled to the respective light sources 364 by light guides 368, which transmit light from the light sources 364 to the light outputs 366 (for example, via internal reflection). The light outputs 366 extend through corresponding recesses in the hinged halves 228a, 228b on an upper surface of the motor housing portion 218 of the housing 214 ( Fig. 1 and Fig. 3), opposite the battery receptacle 236, such that the light outputs 366 are visible to a user looking down the top of the housing 214. In the illustrated embodiment, the light outputs 366 are substantially flush with the adjacent outer surface of the motor housing portion 218. However, in other embodiments, the light outputs 366 may be recessed into the motor housing portion 218 (e.g., for protection) or protrude from the motor housing portion 218 (e.g., for better visibility). Furthermore, in other embodiments, the light outputs 366 may be positioned elsewhere on the power tool 210 (e.g., on a side of the motor housing portion 218).

[0043] By separating the light sources 364 from the light outputs 366 via a gap spanned by the light guides 368, the light sources 364 and the first LPA 263 on which they are mounted are better protected from contamination, such as water or contaminants, as well as from impacts (for example, if the power tool 210 were dropped and struck the top of the housing 214). In other embodiments, the light sources 364 may not be separated from the light outputs 366. In still other embodiments, the light sources 364 may be arranged elsewhere, and the light guides 368 may be extended (and may, for example, comprise flexible optical fibers).

[0044] How to continue in Fig. 4, the illustrated display assembly 362 includes a first light-transmissive body 379a and a second light-transmissive body 379b, each formed from a respective one-piece molded piece of plastic material. The plastic may be a substantially transparent material in some embodiments or a semi-transparent (translucent) material in some embodiments. Each light-transmissive body 379a, 379b includes two of the light outputs 366 and two of the light guides 368, which are surrounded by a flange 381. The flange 381, in turn, is surrounded by a gasket 383 made of an opaque material, and preferably a resilient opaque material such as rubber. In some embodiments, the gasket 383 may be molded onto the flange 381. As shown in Fig. 3, the seal 383 may act between the flange 381 of the associated translucent body 379a, 379b and the housing 214 to prevent the ingress of liquid or dirt from the environment of the display assembly 362 into the housing 214. In some embodiments, the first translucent body 379a is associated with and supported in the first flip half 228a, and the second translucent body 379b is associated with and supported in the second flip half 228b.

[0045] As in Fig. 2-3, the illustrated power tool 210 further includes a second LPA 265 positioned within the handle portion 226 (adjacent an upper end of the handle portion 226) and generally between the trigger switch 261 and the motor 242 in a direction perpendicular to the axis 254. The illustrated second LPA 265 extends parallel to the axis 254 below the gear housing 274. The second LPA 265 is electrically connected to the motor 242, the trigger switch 261, and the battery pack interface 238 located in the handle portion 226. In the illustrated embodiment, the second LPA 265 includes a plurality of switching elements 445 (e.g., semiconductor switching elements such as MOSFETs, IGBTs, or the like); Fig. 5) that control and distribute power to the windings in stator 246 to cause rotation of the rotor and output shaft 250. The second LPA 265 may also include one or more microprocessors, machine-readable non-volatile memory elements, and other electrical or electronic elements acting as control system 400 to provide operational control for the power tool 210, as described in more detail below. In other embodiments, the second LPA 265 may be omitted, and the electrical and electronic components of the second LPA 265 may be incorporated into the first LPA 263.

[0046] An embodiment of the control system 400 of the power tool 210 will now be described with reference to Fig. 5. The control system 400 includes a controller 405 with components that may be located on the first LPA 263, the second LPA 265, and / or other circuit boards housed in the power tool 210. For example, the components located on the respective LPA 263 and 265, as described above, may be located on the other LPA 263 and 265. In other embodiments, the LPA 263 and 265 may include additional or alternative components.

[0047] The controller 405 is electrically and / or communicatively connected to a variety of components of the power tool 210. For example, the controller 405 is electrically connected to the motor 242, the battery pack interface 238, the trigger switch 261, one or more sensors (e.g., the Hall-effect sensors 264 and optionally other sensors such as, but not limited to, torque sensors, speed sensors, motor current or voltage sensors, etc.), one or more displays (e.g., the display assembly 362), and one or more light sources (e.g., the work light assembly 289). The illustrated controller 405 is also electrically connected to the power input circuitry 440 and the switching elements 445.The controller 405 includes combinations of hardware and software operable to, among other things, control the operation of the power tool 210, monitor the operation of the power tool 210, activate the one or more indicators 362 and / or the work light assembly 289, etc.

[0048] The controller 405 includes a variety of electrical and electronic components that provide power, operational control, and protection for the components in the controller 405 and / or the power tool 210. For example, the controller 405 includes, among other things, an electronic processor 450 (e.g., a microprocessor, a microcontroller, or other suitable programmable device), a memory 455, input units 460, and output units 465. The electronic processor 450 includes, among other things, a control unit 470, an ALU 475, and a plurality of registers 480 (in Fig.5 as a group of registers) and is implemented using a computer architecture (e.g., a modified Harvard architecture, a von Neumann architecture, etc.). The electronic processor 450, the memory 455, the input units 460 and the output units 465, as well as the various modules or circuits connected to the controller 405, are connected via one or more control and / or data buses. The use of one or more control and / or data buses for the interconnection and communication between the various modules, circuits, and components will be understood by those skilled in the art in light of the embodiments described herein.

[0049] The memory 455 is a non-transitory computer-readable medium and includes, for example, a program storage area 457 and a data storage area 458. The program storage area 457 and the data storage area 458 may include combinations of different memory types, such as ROM, RAM (e.g., DRAM, SDRAM, etc.), EEPROM, flash memory, a hard disk, an SD card, or other suitable magnetic, optical, physical, or electronic storage devices. The electronic processor 450 is connected to the memory 455 and executes software instructions that may be stored in a RAM of the memory 455 (e.g., during execution), a ROM of the memory 455 (e.g., fundamentally permanently), or another non-transitory computer-readable medium, such as another memory or a disk.Software included in the implementation of the power tool 210 may be stored in the memory 455 of the controller 405. The software includes, for example, firmware, one or more applications, program data, filters, rules, one or more program modules, and other executable instructions. The controller 405 is configured to retrieve and execute, among other things, instructions related to the control processes and methods described herein from the memory 455. In other implementations, the controller 405 includes additional, fewer, or different components.

[0050] The electronic processor 450 is configured to receive power from a power supply connected to the power tool 210 (e.g., from an Aldcupack connected to the power tool 210 via the Aldcupack interface 238). The electronic processor 450 may be configured to control whether power is supplied to the motor 242. The switching elements 445 (e.g., field-effect transistors) are controlled by the electronic processor 450 to selectively supply power to coils of the motor 242 to enable their operation.

[0051] In some embodiments, the controller 405 (specifically, the electronic processor 450) is configured, in response to determining that the trigger 262 has been actuated, to control the motor 242 according to a selected motor operating mode (e.g., by controlling the switching elements 445). In some cases, the selected motor operating mode according to which the electronic processor 450 controls the motor 242 comprises one of a plurality of motor operating modes indicating at least one from the group consisting of motor speed 242, motor torque 242, operation mode of the output device 326, and combinations thereof. Non-limiting examples of the operation of the output device 326 include controlling the motor 242 upon a detected event (e.g., upon detection of striking a striking mechanism, a predetermined number of strikes, a predetermined torque, etc.).In some cases, the motor operating modes may include additional operating modes and / or control of additional or alternative features of the motor 242 and / or tool operation in general. Furthermore, in other embodiments of the power tool, the operation of the output device may include operating modes of a hammer drill or rotary hammer (e.g., hammer only, drill only, hammer and drill, etc.) or the like.

[0052] In some cases, the electronic processor 450 is configured to adjust the motor operating mode in response to determining that the trigger 262 has been actuated in a first manner. The electronic processor 450 may also be configured to operate the motor 242 according to the selected operating mode in response to determining that the trigger 262 has been actuated in a second manner different from the first manner. In some cases, a different actuation manner of the trigger between the second manner and the first manner includes at least one of the group consisting of a different pressure applied to the trigger 262, a different direction of movement of the trigger 262, a different number of actuations of the trigger 262 within a predetermined period of time (e.g.,one second, two seconds, or the like), a duration of actuation of the trigger 262, an actuation of the trigger 262 after actuation of a second actuating element, and combinations thereof.

[0053] The electronic processor 450 may cycle between the multiple operating modes (e.g., in response to determining that the trigger 262 is actuated in the first manner) and may indicate the selected operating mode to the user via the indicator assembly 362. For example, the electronic processor 450 may illuminate a first light source 364 in a first operating mode, a second light source 364 in a second operating mode, a third light source 364 in a third operating mode, and a fourth light source 364 in a fourth operating mode. In other embodiments, other light combinations may be used to indicate the selected operating mode, and the power tool 210 may include a greater or fewer number of operating modes.

[0054] As indicated in the examples above, a single user input device (e.g., trigger 262) can be used to both control a tool operating mode (e.g., motor operating mode) of the power tool 210 and to operate the power tool 210 (e.g., by activating and operating the motor 242 according to the selected operating mode). The trigger 262 for both controlling the power tool 210 and selecting the operating mode takes up less space on the power tool 210 than if multiple separate actuators with dedicated functionality were included, and enables a lightweight, compact, and easy-to-handle power tool 210. In some cases, the power tool 210 may still include a separate actuator with dedicated functionality, for example, to cycle through corresponding operating modes.Such an actuating element may be designed as a push button on an upper surface of the battery receptacle 236, on the housing 214, or may be another suitable type of actuating element at any position of the power tool 210 accessible to the user.

[0055] The particular power tool 210 illustrated and described is merely an example. The display assembly 362 integrated on the sensor board assembly and / or other features described herein may also be implemented on other types of power tools, including, but not limited to, drills, ratchets, rotary hammers, saws, multi-tools, and grinders.

[0056] Although the disclosure has been described in detail with reference to certain preferred embodiments, there are variations and modifications within the scope and spirit of one or more independent aspects of the disclosure as described.

[0057] Various features of the disclosure are set forth in the following claims. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 520223

[0001]

Claims

[1] Power tool comprising: a housing; a motor mounted in the housing, the motor comprising a stator and a rotor; and a printed circuit board assembly mounted in the housing, the printed circuit board assembly comprising a sensor designed to detect rotation of the rotor and a display assembly, wherein the display assembly is configured to display an operating parameter of the power tool. [2] Power tool according to claim 1, further comprising: a controller configured to control operation of the engine according to a selected one of a plurality of operating modes; and an actuating element, wherein the controller is configured to switch the selected operating mode between the plurality of operating modes in response to an actuation of the actuating element, and wherein the controller is designed to control the display assembly so that it displays the selected operating mode. [3] The power tool of claim 2, wherein the controller is configured to switch the selected operating mode between the plurality of operating modes in response to the actuating member being actuated in a first manner, and wherein the controller is configured to control the motor in accordance with the selected operating mode in response to the actuating member being actuated in a second manner different from the first manner. [4] A power tool according to claim 3, wherein the actuating element is a trigger carried by the housing. [5] The power tool of claim 4, wherein the housing includes a handle portion, and wherein the trigger is disposed on the handle portion. [6] A power tool according to any one of the preceding claims, further comprising a gear assembly driven by the motor, wherein the circuit board assembly is disposed between the stator and the gear assembly. [7] Power tool according to one of the preceding claims, wherein the circuit board assembly is coupled to the stator. [8] Power tool according to one of the preceding claims, wherein the circuit board assembly is a first circuit board assembly, and wherein the power tool further comprises a second circuit board assembly, the second circuit board assembly having a plurality of switching elements configured to supply power to the motor. [9] Power tool according to one of the preceding claims, wherein the sensor is a Hall effect sensor. [10] A power tool according to any one of the preceding claims, wherein the display assembly comprises a light source mounted on the circuit board assembly. [11] The power tool of claim 10, wherein the display assembly comprises a light output configured to output a visible light generated by the light source and a light guide configured to transmit the visible light from the light source to the light output. [12] The power tool of claim 11, wherein the light output and the light guide are integrally formed together as a single light output body, and wherein the display assembly further comprises a seal disposed between the light output body and the housing. [13] Power tool comprising: a housing; a motor mounted in the housing, the motor comprising a stator and a rotor with an output shaft rotatable about an axis; a gear arrangement mounted in the housing and coupled to the output shaft, the gear arrangement having a ring gear; a circuit board assembly mounted in the housing between the stator and the ring gear in a direction along the axis, the circuit board assembly including a display assembly having a light source mounted on the circuit board assembly and configured to display an operating parameter of the power tool. [14] The power tool of claim 13, further comprising a controller configured to control operation of the motor according to a selected one of a plurality of operating modes; and an actuator, wherein the controller is configured to switch the selected operating mode between the plurality of operating modes in response to actuation of the actuator, and wherein the controller is configured to control the display assembly to display the selected operating mode. [15] A power tool according to claim 13 or 14, wherein the light source is one of a plurality of light sources mounted on the circuit board assembly. [16] The power tool of any of claims 13-15, wherein the display assembly includes a light output configured to output a visible light generated by the light source, the housing including a battery receptacle, and the light output being disposed on a top surface of the housing opposite the battery receptacle. [17] The power tool of claim 16, wherein the display assembly includes a light guide configured to transmit the visible light from the light source to the light output. [18] The power tool of claim 17, wherein the light output comprises a lens. [19] The power tool of claim 18, wherein the light output and the light guide are integrally formed together as a single light output body, and wherein the display assembly further comprises a seal disposed between the light output body and the housing. [20] Power tool comprising: a housing; a motor mounted in the housing, the motor comprising a stator and a rotor; a printed circuit board assembly mounted in the housing and coupled to the stator, the printed circuit board assembly including a display assembly with a light source mounted on the printed circuit board assembly configured to display an operating parameter of the power tool.

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