An electric motor includes a rotor, a stator, and a connection switching unit. The stator includes a stator core including 6×n (n is an integer equal to or larger than 1) slots, and three-phase coils forming 2×n magnetic poles. The connection switching unit switches a connection state of the three-phase coils between a first connection state and a second connection state. The three-phase coils include 2×n U-phase coils, 2×n V-phase coils, and 2×n W-phase coils in a coil end. Each coil of the three-phase coils is disposed in two slots across one slot on one end side of the stator core.

Provided is a coil including first and second lead parts, and a winding part. The winding part includes first to n-th turns. The winding part includes first and second coil ends. The first lead part extends from the first turn to the n-th turn along an upper surface of the first coil end. The second lead part extends from the n-th turn. The first and second lead parts include respective ends that are equal in height from the upper surface of the first coil end when viewed from a radial direction, and are equidistant from the n-th turn when viewed from an axial direction.

A stator for an electric axial flux machine, more particularly a stator for an axial flux machine designed as a prime mover for an electrically driven motor vehicle, which stator includes a stator body with a plurality of stator teeth distributed around the circumference and stator windings. At least one of the wound stator teeth is split, seen in the radial direction, into at least two stator part teeth, wherein the at least two stator part teeth are wound with a different number of turns of the stator winding.

A power tool is provided including a gear case having a spindle, a motor case connected to a rear end of the gear case along a longitudinal axis; a handle portion extending from a rear end of the motor case along the longitudinal axis; a motor housed inside the motor case; a fan in rotational connection with the motor; at least one air intake arranged at least one of the motor case or the handle portion near the rear end of the motor case; and a power module including power switches for driving the motor and a heat sink. The power module is housed in at least one of the motor case or the handle portion near the rear end of the motor case such that rotation of the fan causes air flow to enter through the air intake and flow near the heat sink and through the motor.

A power tool is provided including a gear case having a spindle, a motor case connected to a rear end of the gear case along a longitudinal axis; a handle portion extending from a rear end of the motor case along the longitudinal axis; a motor housed inside the motor case; a fan in rotational connection with the motor; at least one air intake arranged at least one of the motor case or the handle portion near the rear end of the motor case; and a power module including power switches for driving the motor and a heat sink. The power module is housed in at least one of the motor case or the handle portion near the rear end of the motor case such that rotation of the fan causes air flow to enter through the air intake and flow near the heat sink and through the motor.

Rotor for an electrical machine has a rotor core with a plurality of radially outwardly extending rotor legs, a number of exciter windings corresponding to the number of rotor legs, each wound around one of the rotor legs, and a separating device, having a number of separating portions corresponding to the number of rotor legs, which are arranged between a respective pair of adjacent exciter windings and extend axially between two opposing end faces of the rotor, a first annular connecting portion which connects together the separating portions at one of the end faces, and a second annular connecting portion which connects together the separating portions at the other of the end faces. The separating device is formed by a first part and by a second part which are joined together by means of a form-fit and/or force-fit connection, wherein the first part comprises at least the first connecting portion and at least partially the separating portions, and the second part comprises at least the second connecting portion.

Rotor for an electrical machine has a rotor core with a plurality of radially outwardly extending rotor legs, a number of exciter windings corresponding to the number of rotor legs, each wound around one of the rotor legs, and a separating device, having a number of separating portions corresponding to the number of rotor legs, which are arranged between a respective pair of adjacent exciter windings and extend axially between two opposing end faces of the rotor, a first annular connecting portion which connects together the separating portions at one of the end faces, and a second annular connecting portion which connects together the separating portions at the other of the end faces. The separating device is formed by a first part and by a second part which are joined together by means of a form-fit and/or force-fit connection, wherein the first part comprises at least the first connecting portion and at least partially the separating portions, and the second part comprises at least the second connecting portion.

Provided is a motor for a drone comprising: a rotary shaft; a stator including a hole in which the rotary shaft is disposed; a rotor disposed outside the stator; and a housing coupled to the stator, wherein the stator comprises a stator core and a coil wound around the stator core, wherein the stator core comprises an annular yoke coupled to the housing, teeth extending radially from the yoke, and a shoe disposed at one end of the teeth, wherein the teeth comprise protrusions projecting from the side surface thereof. As such, the present invention provides an advantageous effect of securing an air flow path for heat radiation to enhance a heat radiating effect while preventing water or foreign matter from flowing into the motor.

Provided is a motor for a drone comprising: a rotary shaft; a stator including a hole in which the rotary shaft is disposed; a rotor disposed outside the stator; and a housing coupled to the stator, wherein the stator comprises a stator core and a coil wound around the stator core, wherein the stator core comprises an annular yoke coupled to the housing, teeth extending radially from the yoke, and a shoe disposed at one end of the teeth, wherein the teeth comprise protrusions projecting from the side surface thereof. As such, the present invention provides an advantageous effect of securing an air flow path for heat radiation to enhance a heat radiating effect while preventing water or foreign matter from flowing into the motor.

A hub-type electronic driving device comprises: a housing comprising a wheel and a cover, the wheel having a rim formed on the outer periphery thereof such that a tire is coupled thereto, the wheel having the shape of a cup, one side of which is open, and the cover having an outer peripheral portion coupled to the opening of the wheel; a motor shaft having both ends fixedly installed on a body in which the hub-type electronic driving device is installed; first and second bearings installed in through-holes formed at centers of the wheel and the cover, respectively, so as to rotatably support the housing around the motor shaft; a BLDC motor contained in the housing so as to rotate the housing around the motor shaft; a cable containing multiple wires for applying a motor driving signal from a motor driving circuit installed outside the housing to the BLDC motor; and a cable guide assembly installed between the motor shaft and the first bearing supporting the wheel so as to maintain a sealing state when the cable is introduced into the housing or withdrawn therefrom.