The present invention relates to a direct cooling type handpiece, and more particularly, to a direct cooling type handpiece that is configured to allow an outer housing and a core to be spaced apart from each other and thus to allow the core to be fixed to a PCB and a support cap, so that air flows to the space between the outer housing and the core, thus efficiently cooling the high heat generated from the handpiece while the handpiece is being operated.

A power tool, for example, a portable circular saw, includes a fan, a motor configured to rotate the fan, an output part or shaft driven by the motor, a motor housing that houses the motor, a grip housing connected to the motor housing, a trigger associated with the grip housing, and a brake member configured to brake a rotation of the motor, the brake member being mounted inside the grip housing. The brake member may be a resistive element of a rheostatic braking system. The housing and fan are configured such that cooling air is directed to cool the brake member.

An electric motor includes a stator, and a rotor which has a rotor shaft. At least one rotor position magnet is disposed on the rotor shaft, and is configured to provide a magnetic signal that can be evaluated, upon a rotation of the rotor shaft, at least for the purpose of determining a respective rotor position of the rotor. At least one carrier is disposed in a rotationally fixed manner on the rotor shaft, and is connected to the at least one rotor position magnet. The carrier includes at least one opening configured to compensate imbalance of the rotor.

A power tool is provided including an elongated housing. The housing includes a motor case disposed at a front end thereof and a handle portion extending along a longitudinal axis of the housing from the motor case to a rear end of the housing. The handle portion includes two elongated walls extending from motor along the longitudinal axis of the housing to form a planar opening within the handle portion. A partition wall is arranged along an axis substantially perpendicular to the longitudinal axis of the housing, separating the handle portion from the motor case. An electric motor having a drive shaft is mounted within the motor case, and a module casing supporting a planar circuit board is received within the planar opening and supported by the elongated walls within the handle portion of the housing axially along the longitudinal axis of the housing.

Electric chain saw with static cooling features a cutting chain fitted so as to turn around a drive sprocket and a guide bar of oblong shape, and an electric motor effecting the drive of this chain, through the intermediary of the sprocket. The electric drive motor drive of the cutting chain is a brushless direct current motor enclosed in a housing formed by at least two components and made of a light metallic alloy, with one surface of the housing being in contact with the drive motor drive, to provide static cooling.

A power tool is provided including a tool housing including a motor housing and a handle portion; a battery receptacle disposed at an end of the handle portion opposite the motor housing, the battery receptacle being configured to receive a battery pack having a maximum voltage of at least 60 V; and a brushless DC (BLDC) motor including an electronically-commutated stator assembly and a rotor assembly magnetically interacting with the rotor assembly to rotate with respect to the stator assembly, the stator assembly comprising a stator lamination stack sized to be received within the motor housing having a circumference of approximately 140 to approximately 190 mm. The motor produces a maximum power output of at least 1600 watts for driving an output shaft at a maximum torque of at least 30 inch-pounds and a maximum speed of at least 8000 rotations-per-minute.

A brushless motor includes a stator assembly including a generally-cylindrical stator body having a center bore, teeth extending from the stator body towards the center bore and defining slots in between, and windings wound around the teeth; and a rotor assembly rotatably received within the center bore and includes a rotor shaft and a generally-cylindrical rotor body. The motor further includes at least one rotor bearing mounted on the rotor shaft, and at least one bearing support member supporting the rotor bearing. The bearing support member includes a radial body forming a bearing pocket for receiving the rotor bearing therein, and axial post inserts received within the slots of the stator assembly between adjacent sets of windings and in contact with an inner curved surface of the stator body to support the rotor bearing with respect to the stator assembly along a center axis of the center bore.

A power tool is provided including a brushless DC (BLDC) motor having a stator assembly and a rotor; a substantially-cylindrical motor housing having an open end for receiving the stator assembly, a rear end, a substantially-cylindrical bearing pocket formed in the rear end to receive the rear bearing of the motor therein, and a radially-extending slot formed at or near its rear end; and a positional sensor board radially received within the slot along a central receiving axis. The positional sensor board includes a curved inner edge shaped to be positioned around the bearing pocket and includes positional sensors mounted around the curved inner edge and facing the rotor to sense a rotational position of the rotor. The curved inner edge is disposed on a side corner of the positional sensor board such that the positional sensor board is asymmetrically-shape in a direction of the receiving axis.

Described herein is a work tool (100) comprising: a motor (125) provided with a drive shaft (130), a casing (195) containing the motor (125) and provided with at least one inlet opening (235) and with at least one outlet opening (240), an implement (135) positioned outside the casing (195) and kinematically connected with the drive shaft (130), and a fan (245) kinematically connected to the drive shaft (130) and able to generate a flow of air from the inlet opening (235) towards the outlet opening (240) of the casing (195) passing in heat exchange relationship with the motor (125), wherein said fan (245) is contained inside the casing (195) in a space located between the motor (125) and the implement (135).

A hand-held tool that includes a housing. The housing includes a handle. A tool also includes a motor assembly, a battery assembly and a circuit board. The motor assembly includes a motor, the motor including a rotatable motor output shaft, a motor positive terminal and a motor negative terminal. The motor assembly also includes a first rigid conductive electrical connector having a first end fixed to the motor positive terminal and a second end fixed to the circuit board. The battery assembly includes a battery cell with a battery cell positive terminal and a battery cell negative terminal. The battery assembly further includes a second rigid conductive electrical connector having a first end fixed to the battery cell positive terminal and a second end fixed to the circuit board.