Abstract: A power tool is provided including a housing and a motor housed inside the housing. The motor includes a stator assembly and a rotor pivotably arranged inside the stator assembly. The stator assembly includes a lamination stack defining poles extending radially towards a center of the lamination stack, pole teeth extending laterally with respect to ends of the poles, and stator slots formed between adjacent poles. The stator assembly also includes field windings wound around the poles. Electrically non-conductive tooth damper inserts are longitudinally arranged inside the stator slots between adjacent field windings, each tooth damper insert including a radial outer end in contact with an outer wall of the slot and a radial inner end arranged at an open end of the slot and engaging lateral edges of two opposing teeth within the slot.

Abstract: A power tool is provided including a housing and an electric motor disposed in the housing. The motor includes a stator having pole pieces mated together and field coils disposed on the pole pieces, the stator having an outside diameter. The motor also includes an armature having an outside diameter that is at least 0.625 of the outside diameter of the stator.

Abstract: The cover is provided with engaging pieces that engage with a recessed groove provided on the outer peripheral surface of a hammer case and hold the cover on the hammer case to prevent the cover from being detached. The cover is also provided with bumper receiving portions extending from the front end of the cover and allowing the bumper to be externally attached to the cover, and engaging claws formed on the bumper receiving portions and engaging with engaged recessed portions formed on the inner peripheral surface of the bumper for holding the bumper to prevent the bumper from being detached from the cover. The cover with the bumper attached to the bumper receiving portions is provided to the hammer case.

Abstract: Three battery cells can be arranged such that one battery cell is situated on the front side of a handle portion and that the remaining two battery cells are situated on the rear side thereof while being arranged laterally side by side. Also, a handle portion can be generally of a triangular cross-sectional configuration whose apex portion is situated on the front side of the handle portion and whose base portion is situated on the rear side thereof; and the handle portion is grasped by bringing fingertips into contact with the apex portion (11a) on the front side.

Abstract: An electrical power tool has an electronically commutated drive motor, preferably a direct current motor. The motor includes a stator core equipped with an insulating body, on which core a motor winding is embodied. Also included in the motor is at least one electrically conductive connector element for electrical connection of the motor winding, the connector element being disposed on the insulating body. The connector element has a fastening segment, and a receptacle for reception of the fastening segment is provided on the insulating body. The fastening segment and the receptacle have complementary geometrical shapes that prevent self-actuated detachment of the fastening segment disposed in the receptacle.

Abstract: A power tool with a combined printed circuit board (PCB) that reduces internal wiring of the power tool and provides a large amount of air flow to internal components. In some instances, the combined PCB has a surfboard shape and includes a motor control unit and power switching elements (Field Effect Transistors or FETs). The combined surfboard PCB is located above the trigger, but below the motor and drive mechanism. In other instances, the combined PCB has a doughnut shape and is located coaxially with a motor shaft. The combined PCB may be positioned between a doughnut-shaped control PCB and the motor.

Abstract: A power tool is provided including a tool housing in which an electric motor is disposed. The electric motor includes a stator and an armature rotatably received within the stator. The armature has an armature shaft on which a commutator is mounted. The power tool further includes at least one brush assembly disposed around the commutator, the brush assembly including: a brush having two grooves on opposites surfaces therein; a brush holder comprising two support plates arranged defining guiderails that extend into the grooves of the brush to facilitate movement of the brush along a single axis; and a spring contacting the brush that urges the brush radially inwardly along the axis.

Abstract: A handheld power tool having an electronically commutated drive motor which is situated in an associated housing and which has a rotor provided with a rotor shaft, in which the rotor shaft is rotatably mounted in the associated housing having an axial clearance which is based at least partially on manufacturing tolerances, and at least one position sensor magnet is rotatably fixedly mounted on the rotor shaft. The position sensor magnet is assigned a sleeve-like spacer for reducing the axial clearance.

Abstract: A power tool includes a housing, a motor accommodated in the housing, a cooling fan arranged coaxially with the motor, a trigger switch configured to activate the motor, a motor control board on which a switching device is mounted to drive the motor, and a coupling unit provided below a bottom surface of the motor. The motor control board is fixed to the motor via the coupling unit such that the motor control board is disposed below the motor and above the trigger switch.

Abstract: A hand-held machine tool comprises a driving motor that is mounted in a machine tool housing and is used to drive a tool, and a damping element accommodated in the machine tool housing. At least one damping element is arranged between the housing of the driving motor and the machine tool housing and forms a support element for mounting and supporting the driving motor in the machine tool housing.

Abstract: A disk motor includes a rotor, a stator, and an output shaft which is coaxially integrated with the rotor, a coil disk is provided in one of the rotor and the stator, a magnetic-flux generating part is provided in the other of the rotor and the stator, and the coil disk is configured by laminating a plurality of coil substrates each on which a coil pattern is printed. Among these coil substrates, in the coil substrates 40Aa and 40Af on both ends in the laminating direction having relatively good heat dissipation effect, the coils are electrically connected in series to each other, and, in the coil substrates 40Ab to 40Ae on an inner side in the laminating direction having relatively poor heat dissipation effect. at least a part of the coils is electrically connected in parallel to each other.

Abstract: A handheld device comprises a housing, a motor, and a thermally conductive pad disposed in a space between the motor and the housing. Heat generated by the motor can be conducted by the thermal pad to the housing or to an internal fluid passage generally extending the length of the motor. In some embodiments, the thermal pad is configured to maintain the temperature of the housing in accordance with industry guidelines.

Abstract: The present disclosure generally relates to systems and devices for spraying fluid materials such as paints, stains, and the like, and more specifically, but not by limitation, to a dual voltage electromagnet motor for an airless fluid sprayer. In one example, a dual-voltage electric airless fluid sprayer is provided and includes a fluid reservoir and a pump configured to receive fluid from the fluid reservoir. An electric motor is operably coupled to the pump and includes a plurality of windings. The plurality of windings include a first winding portion having a first wire gauge and a first number of windings and a second winding portion having a second wire gauge and second number of windings. A power-module receiving portion is configured to receive a power module to couple one of the first or second winding portions to a source of electrical power.

Abstract: A work apparatus has a tool which is driven in rotation by a drive motor via a transmission. The drive motor is an electric motor which has a commutator and brushes. The drive motor is arranged in a motor housing and drives an impeller wheel which conveys a cooling airflow for the drive motor. Simple and effective lubrication of the transmission is achieved with the cooling airflow flowing past the commutator and brushes and the transmission is arranged downstream of the commutator in the cooling airflow. The motor housing is formed in a manner closed toward the transmission housing on that end side that faces the transmission housing and is connected to the transmission housing via a flow connection.

Abstract: A power tool includes a brushless DC motor having a stator assembly and a rotor assembly at least a portion of which is arranged pivotably inside the stator assembly. The rotor assembly includes a rotor lamination stack housing a permanent magnets and a rotor fixedly housed inside a center portion of the lamination stack to pivot therewith. A fan may be fixedly attached to the rotor and arranged adjacent the stator assembly. The fan includes a back plate and blades longitudinally projecting from a periphery of the back plate towards the stator assembly, where a middle portion of the back plate is contoured away from an end cap of the motor to accommodate a projecting portion of the end cap. The permanent magnets may extend beyond the longitudinal length of the rotor lamination stack towards a magnet sensor to facilitate sensing of the permanent magnet via the magnet sensor.

Abstract: A power tool includes a motor having a stator assembly and a rotor pivotably arranged inside the stator. The stator assembly includes a lamination stack defining a plurality of poles; a plurality of field windings each arranged at at least two opposite poles of said plurality of poles and connected together around the stator assembly; and a plurality of conductive terminals longitudinally arranged along an outer surface of the lamination stack and electrically coupled to the plurality of field windings and a power source.

Abstract: A power tool has a motor having a stator made by separately forming pole pieces and field coils. The field coils are placed over necks of the pole path pieces. An armature has an outside diameter of at least 0.625 the outside diameter of the stator is placed in the stator. The housing has a girth of 200 mm or less with the motor wound to provide a maximum watts out to housing girth ratio of at least 5 maximum watts outs to 1 mm of housing girth. The field coils may be formed so that they extend beyond pole tips of the pole pieces.

Abstract: An electric power tool comprising: a motor including, a rotor, a stator including a plurality of teeth, and a coil wound on the teeth; a front-end tool configured to be driven by an output of the motor; a driving circuit configured to supply driving voltage to the coil of the motor; a control unit configured to control operation of the driving circuit; and a trigger switch configured to control activation and rotation of the motor wherein a first coil and a second coil are mounted on the teeth as the coil, and wherein the control unit controls supply of the driving voltage to the first coil and the second coil in accordance with a pulling amount of the trigger switch.

Abstract: An electric tool has a rib projecting from an inner peripheral surface of the electric tool, and a trigger switch. The trigger switch has a housing having a housing venthole, a contact mechanism disposed in the housing, and a trigger that, when depressed into the housing, drives the contact mechanism. The housing of the trigger switch is bonded to the rib. The rib has a rib venthole. The housing venthole is communicated with the rib venthole. The rib venthole is covered with a filter.

Abstract: A power tool includes a housing, a brushless motor, and a cover member. The housing has an air intake hole and an air exhaust hole formed therein, the housing having an inner surface. The brushless motor has an outer surface disposed in the housing, a first endface near the air intake hole, and a second endface near the air exhaust hole. The cover member covers at least one of the first endface and the second endface for preventing dust from entering the brushless motor. The inner surface of the housing and outer surface of the brushless motor define a circulation path providing communication between the air intake hole and the air exhaust hole.

Abstract: A power tool has a casing and a motor assembly installed within the casing. The motor assembly comprises a motor, a heat dissipation device, a fan and a guiding member. The motor has a stator and a rotor. The heat dissipation device has an annular heat absorbing section which is fitted to a housing of the stator and a plurality of fins extending from the heat absorbing section for dissipating heat. Air flow generated by the fan is guided to the fins of the heat dissipation device by the guiding member to cool the motor.

Abstract: In one general aspect, various embodiments are directed to an ultrasonic surgical instrument that comprises a handpiece housing that rotatably supports an ultrasonic transducer assembly therein that may be selectively rotated by various motor configurations. Various slip ring arrangements are disclosed for supplying ultrasonic electrical signals and motor drive signals from a control system. Various forms of blade and cutting implements are disclosed for attachment to the ultrasonic transducer assembly such that such implements may be selectively rotatable within a hollow outer sheath. Vacuum may be applied to the cutting implement or through the outer sheath to draw tissue through an opening in the sheath and into contact with the cutting implement.

Abstract: An electric power tool includes: a motor including a motor shaft; a tip tool driven by the motor; a housing that houses the motor; a switching element for driving the motor; and a bearing that can retain the motor shaft. The switching element is provided so as to overlap with the bearing in a direction of the motor shaft inside the housing.

Abstract: A power tool includes a brushless DC motor having a stator and a rotor pivotably arranged inside the stator, the stator including a first winding, a second winding, and a third winding. Each winding is arranged at at least two opposite poles connected together. The stator windings may be connected in a delta configuration by electrically coupling adjacent terminals of the first and second windings, second and third windings, and third and first windings at three connection points. A baffle may be provided in parallel and adjacent to the stator, the baffle including at least one conductive routing or stamping to facilitate electrically coupling the first, second, and third windings in at least one of a delta or a wye configuration.

Abstract: An electric motor for use with a power tool includes a motor housing having a first end and an open second end, a first bearing coupled to the first end of the motor housing, a plurality of magnets coupled to the motor housing, and an armature having a first end and a second end. The first end of the armature is rotatably supported by the first bearing. The second end of the armature protrudes from the open second end of the motor housing without being supported by the open second end of the motor housing. The electric motor also includes a second bearing coupled to the second end of the armature. The motor housing is supportable by a first portion of the power tool housing. The second bearing is supportable by a second portion of the power tool housing.

Abstract: A power tool includes a casing with an inlet and an outlet extending in a radial direction of the casing, a motor installed within the casing between the inlet and the outlet. The motor includes a stator and a rotor with a shaft, an air passage being formed between a radially outer surface of the stator and an inner surface of the casing. The air passage extends in the axial direction of the casing. A heat dissipation device is arranged on the radially outer surface of the stator for absorbing heat from the stator, and is disposed in the air passage. A fan is fixed to the shaft of the rotor.

Abstract: An installation structure of a temperature sensor in a brush motor includes a holding plate; a metal-made fixing base; and a brush holder arranged on the fixing base to hold a brush in place. The metal-made fixing base is provided on the holding plate, and the fixing base includes a sensor attachment portion to which the temperature sensor is attached. Further, the sensor attachment portion is positioned outside the holding plate.

Abstract: A power tool is provided, including a housing, a permanent magnet electric motor in the housing, and an output member coupled to the electric motor. The electric motor includes a rotor and a stator with at least a North pole and a South pole. The stator includes a lamination stack having loose laminations held together via an overmolded resin. The overmolded resin include a longitudinal overmold layer covering at least a portion of at least one of an inner or outer surfaces of the lamination stack, and two end cap portions extending laterally from the ends of the longitudinal overmold layer to firmly cover ends of the lamination stack.

Abstract: A power tool is provided, including a housing, a permanent magnet electric motor in the housing, and an output member coupled to the electric motor. The electric motor includes a rotor and a stator. The stator includes a lamination stack of identically-shaped laminations with a North pole and a South pole. The stator also includes an end cap arranged at one end of the lamination stack. The end cap includes a polarity keying feature in an outer surface therein at a predetermined position with respect to one of the North pole or the South pole to identify a polarity of the stator.

Abstract: A power tool is provided, including a housing, a permanent magnet electric motor in the housing, and an output member coupled to the electric motor. The electric motor includes a rotor and a stator with at least a North pole and a South pole. The stator includes a lamination stack of identically-shaped magnetically-conductive laminations with the identically-shaped pockets stamped therein and secured together in alignment to form the at least one magnet pocket at each pole. Each magnet pocket is contained within the lamination stack distanced from the inner and outer surfaces of the lamination stack. The stator further including at least one permanent magnet embedded within each magnet pocket of each pole.

Abstract: An electric power tool includes a main body provided with a drive unit and a power supply pack detachably attached to the main body and provided with a power supply unit serving as a power source for the drive unit. A first power supply pack in which a secondary battery is used as the power supply unit and a second power supply pack in which an electric double-layer capacitor is used as the power supply unit are selectively used as the power supply pack to be attached to the main body.

Abstract: An electrical power tool may include a switching device capable of controlling output power of a motor, a circuit board supporting the switching device, and a metal case receiving the circuit board. The switching device includes a conductive part and an insulated portion that is covered by an insulating covering material. The conductive part of the switching device contacts the circuit board. The insulated portion of the switching device contacts the metal case via the insulating covering material.

Abstract: An electric motor has a wound stator and a permanent magnet rotor. The rotor has a plurality of rotor core portions and a plurality of permanent magnets, the rotor core portions and the permanent magnets being arranged alternately in a circumferential direction of the rotor. The permanent magnets are made of material containing ferric oxide and polarized generally in the circumferential direction of the rotor. The motor may be used in a power tool or a lawn mower.

Abstract: A power tool including: a motor configured to be rotated by a lithium-ion secondary battery; an end tool configured to be driven by the rotation of the motor; and a switch configured to cause power to be supplied from the lithium-ion secondary battery to the motor when being manipulated by an operator, wherein the lithium-ion secondary battery includes a cell having a 14500 size and is configured to rotate the motor such that an output of the motor is sufficient for driving the end tool.

Abstract: A handheld electric tool has a tool housing in which a drive motor having an assigned commutator is situated, and a screening ring furnished with metal is provided in the area of the commutator on the tool housing for shielding electromagnetic radiation.

Abstract: A power generating device includes a carrier module, a stator module, a rotor module and a power generating module. The stator module is assembled to the carrier module, and has a first circuit board and a plurality of driving coils. The rotor module is located in an electromagnetic field, and has a multipolar magnetic rotor and a rotating axle. A magnetic field of the multipolar magnetic rotor interacts with the electromagnetic field to make the rotor module rotating relative to the stator module, and make the multipolar magnetic rotor producing a varying magnetic field. The power generating module is located in the varying magnetic field, and has a second circuit board and a plurality of induction coils. The induction coils induct the varying magnetic field to output an induction circuit to the second circuit board.

Abstract: It is an object of the invention to provide a technique for easily controlling the output characteristic of a brushless motor in a power tool by adjusting the number of turns of a coil that forms a stator winding. A power tool has a brushless motor which includes a rotor 133 having a permanent magnet, a cylindrical stator, and three-phase stator windings which are installed on an inner circumferential side of the stator and rotationally drive the rotor. A plurality of slots are formed in an inside surface of the stator at predetermined intervals in a circumferential direction. Each of the three stator windings is formed by a plurality of coils wound through the slots of the stator and connected to each other. The total number of turns of the coils wound through the slots in each phase is the same in the three phases and not a multiple of the number of the slots in each phase.

Abstract: A power tool having a cooling system, comprises: a motor housing 11 having a main chamber 14 accommodating a tool motor 12; a handle 15 for holding the power tool and having a cooling passage 16 for the transfer of cooling fluid, at least one inlet 18 leading to the cooling passage and at least one outlet 13 leading away from the cooling passage 18 , and a power tool component 21 which generates heat disposed in thermal contact with the cooling passage 16 between the inlet 18 and the outlet 13.

Abstract: A motorized toothbrush includes a shaft, a tooth brush mounted to a distal end of the shaft, a coil mounted to and surrounding the shaft, a first magnet adjacent to a periphery of the coil, and a second magnet adjacent to the periphery of the coil and on an opposite side of the coil with respect to the first magnet. Passing a current through the coil causes the shaft to rotate alternately clockwise and counterclockwise.

Abstract: A plurality of components of a power tool are coupled to each other to form a component assembly. Positioning members are disposed within a housing body and resiliently support the component assembly from opposite sides in an axial direction.

Abstract: A power tool has a casing and a motor assembly installed within the casing. The motor assembly comprises a motor, a heat dissipation device, a fan and a guiding member. The motor has a stator and a rotor. The heat dissipation device has an annular heat absorbing section which is fitted to a housing of the stator and a plurality of fins extending from the heat absorbing section for dissipating heat. Air flow generated by the fan is guided to the fins of the heat dissipation device by the guiding member to cool the motor.

Abstract: A power tool has a casing and a motor assembly installed in the casing. The motor assembly comprises a motor and a heat dissipation device. The motor comprises a housing and magnets or windings disposed at an inner surface of the housing. The heat dissipation device is arranged at an outer surface of the housing and a window is formed in the casing to expose the heat dissipation device. Preferably, the heat dissipation device comprises an annular heat absorbing section fitted to a radially outer surface of the motor housing and a plurality of fins extending from the heat absorbing section and into the window.

Abstract: An electric power tool for processing a substrate is disclosed. The electric power tool includes a tool which is designed to be rotatable around a rotational axis, a motor assembly having at least one motor which rotates the tool around the rotational axis, a motor housing having at least one receiving area for the at least one motor, a cooling element for cooling the at least one motor, and an electronic assembly having at least one electronic component to be cooled. The cooling of the at least one electronic component to be cooled is carried out via the motor housing.

Abstract: An electric power tool includes a motor, a speed reduction mechanism, a power output unit, a control circuit unit, and a housing. The housing provided with an air supply-exhaust hole. The motor includes a stator core wound with coils, a rotor core and an electronic circuit unit. The electronic circuit unit includes a circuit board, electronic components arranged in the circuit board and including a switching element, coil connection portions arranged in the circuit board and connected to the coils and a control circuit connection portion arranged in the circuit board and connected to the control circuit unit. The motor further includes a radiator member for dissipating heat generated in the switching element of the electronic circuit unit and an insulating cover member molded to cover the electronic components, the coil connection portions, the control circuit connection portion, the circuit board and the radiator member.

Abstract: A coupling device between a motor and a handpiece for dental or surgical use. An electric motor includes a nozzle for coupling to the surgical or dental handpiece, and the ratio between the length of the coupling nozzle and the external diameter of the coupling nozzle set by ISO standard 3964-1982 is between 1.8 and 2.5. The handpiece for surgical or dental use is adapted to receive the shortened coupling nozzle of the electric motor. An assembly can be formed by the handpiece and the electric motor of this type.

Abstract: A battery monitoring system for electric power tool includes a battery pack for electric power tool and an auxiliary power source. The battery pack has a battery and a monitoring circuit. The battery is provided with at least one battery cell. The monitoring circuit is operated by electric power supplied from the battery, and monitors a status of the battery. The auxiliary power source outputs electric power allowing the monitoring circuit to operate. The monitoring circuit is configured such that, when the monitoring circuit is unoperational with the electric power of the battery due to a decrease in a voltage of the battery, the monitoring circuit becomes operational by the electric power supplied from the auxiliary power source.

Abstract: According to an aspect of the present invention, there is provided a power tool including: a housing; a fan rotatably supported by the housing so as to generate an air flow; a wall portion supported by the housing; and a heat generation portion supported by the wall portion, wherein the wall portion has an exposing hole to expose a part of the heat generation portion so that the exposed part of the heat generation portion is positioned within the air flow.

Abstract: A hand-held machine tool with improved output efficiency includes a casing to hold a control circuit connected to a power source and an electric motor which includes a stator, a rotor and an output spindle. The stator has a core and a plurality of stator magnetic poles extended radially. The stator magnetic poles are wound by an exciting winding. The core has an axle hole run through by the output spindle. The rotor has a transmission portion fastened to the output spindle and an induction portion extended from the transmission portion and horizontally corresponding to the stator magnetic poles. The induction portion has a plurality of rotor magnetic poles on an inner rim thereof corresponding to the stator magnetic poles. The rotor magnetic poles and stator magnetic poles are magnetically coupled to induce a magnetic force to drive the output spindle to rotate against the stator in the axle hole.

Abstract: A hand tool RFI suppression system comprising a DC motor having a conductive housing, a power supply and a suppression circuit board supporting at least one suppression assembly and at least one ground circuit electrically coupled to the suppression assembly. The suppression circuit board is mounted to the motor housing with the at least one suppression assembly electrically coupled in parallel between the power supply and the DC motor and the ground circuit is electrically coupled to the motor housing. A method of suppressing RFI in a power hand tool is also provided.

Abstract: An electric tool may include a motor housing and a motor disposed within the motor housing. The motor has a stator fixed in position relative to the motor housing and a rotor rotatable about a motor axis. Cooling air can flow within the motor housing across the motor in a direction substantially parallel to the motor axis. A baffle may be disposed within the motor housing for regulating the flow of cooling air across the motor. At least a part of the baffle may be positioned within a range of a length of the stator with respect to the axial direction of the motor axis.