Abstract: In an embodiment, a system for wear monitoring, includes a wear surface, a metallic reflector embedded in the wear surface, a radio-wave transmitter, and a radio-wave receiver. The metallic reflector reflects radio waves transmitted by the radio-wave transmitter for detection by the radio wave receiver. Attenuation of the radio waves between transmission by the radio-wave transmitter and detection by the radio-wave receiver indicates a degree of wear of the wear surface.

Abstract: Example brush holder assemblies of an electric machine are disclosed. An example brush holder assembly of an electric machine includes a carbon brush including an upper surface and a lower surface opposite the upper surface. The brush holder assembly also includes one or more lead wires extending out of the carbon brush at an insertion point on the upper surface and a first cavity extending into the carbon brush from the upper surface at a location spaced away from the insertion point of the one or more lead wires and unobstructed by the one or more lead wires.

Abstract: Disclosed is a hydraulic control apparatus of a brake system including a modulator block having a motor bore, and a motor including a cover that covers an opening of a case accommodating a stator and a rotor and is supported on one side of the modulator block, wherein a vent hole for air flow between the inside and the outside of the motor is formed on the cover and a communication passage for communicating the motor bore and the vent hole is formed in the modulator block.

Abstract: A system for transferring current between a rotating element and a fixed element, comprising—a support in the general shape of a sheet (10) comprising a conductive portion (11) electrically connected to the fixed element, —a brush holder (20) mounted on the support (10) and supporting a brush (30) that is pushed into contact against the rotating element, —electrical connection means (42) for connecting the conductive portion (11) of the support to a cable (40) that is joined to the brush (30), wherein a resistive element (12) is situated between the brush (30) and the conductive portion (11) of the support (10) and prevents current from flowing directly between the conductive portion and the brush.

Abstract: An actuator device for adjusting an adjusting element may include a housing, an actuator for driving the adjusting element, and a drive circuit for operating the actuator. The housing may include a support body that may include a drive receiving space and a gear receiving space. The drive circuit may include a plurality of electrically conductive conductor bodies for contacting a plurality of drive contacts of the actuator, for contacting a plurality of components of the drive circuit, and for contacting a supply device. At least one conductor body of the plurality of conductor bodies may be structured as a contact tongue, arranged on the drive circuit, and abut on an electrically conductive actuator housing in a pretensioned manner establishing an electrical contact between the drive circuit and the actuator housing. The actuator housing may be configured as at least one of a zero-ground potential and a reference potential.

Abstract: A torque motor assembly includes a shell which has a first wall and a second wall which defines a cavity. A torque motor is positioned at least partially within the cavity. At least one compliant pad is positioned between the first wall and the torque motor and is configured to trap at least one wire within the shell. A housing for a torque motor and a method of assembling a torque motor assembly are also disclosed.

Abstract: An electric actuator assembly is proposed. The electric actuator assembly includes: a brush card assembly provided with a brush card part in which a plurality of terminals is molded through insert injection molding; a motor assembly coupled to the brush card assembly and electrically connected thereto; a housing provided with a coupling part into which the brush card assembly is inserted, having a circuit board provided with a connector, and having a gear assembly for receiving power from the motor assembly and transmitting the power to outside, the circuit board and the gear assembly being installed in the housing, wherein terminal holes through which the plurality of terminals passes and a coupling hole into which a part of the brush card part is inserted are separately provided in the coupling part.

Abstract: An electric motor, in particular a separately excited synchronous motor, has a rotor shaft with at least one slip ring and at least one electrically conductive contact element, in particular a carbon brush, which bears against the slip ring and is accommodated in a channel-like guide formed in a housing and extending radially with respect to the rotor shaft and which carbon brush is radially tensioned against the slip ring by means of a spring element, wherein a roller is provided which is tensioned laterally against the contact element via a further spring element and via which the contact element is tensioned against a wall of the guide.

Abstract: A bar blender comprises a blender blade driven by a motor (16) in a main housing (10). The handle (12) of the housing has a motor speed control button (14). A separate visual display on the housing shows the user the speed setting corresponding to the current position of the control button. The visual display is based on a mechanical linkage between the control button and the visual display to cause a display element to follow the button as it is moved by the user. This is provides a simple and reliable feedback to the user.

Abstract: A rotary module includes a first outer tube, a first member in which a function of the channel is maintained when a first outer tube rotates relative to a first inner tube, the channel coupling an outside of the first outer tube and an inside of the first inner tube, and a second member in which electrical coupling between the first terminal provided on an inner circumference surface of a second outer tube and the second terminal provided on an outer circumference surface of a second inner tube is maintained when the second outer tube rotates relative to the second inner tube, wherein the first outer tube and the second outer tube are fixed, the first inner tube and the second inner tube are fixed, and the first member and the second member are arranged along the same axis as each other.

Abstract: The present disclosure describes an electrical machine. The Electrical machine includes a stator, a rotor, a winding fitted to the rotor, and an apparatus for supplying electrical energy to the winding. The apparatus includes a slip ring and a brush assembly including a brush holder and a brush. The slip ring and the brush assembly are arranged in a housing. An annular gap is disposed between the slip ring and the housing. The housing is fluidically substantially sealed in relation to an exterior, and a flow path of air is routed through the housing in a closed arrangement. The housing includes a housing part fluidically connected to the annular gap via a first flow opening and a second flow opening. A flow section of the flow path is routed through the housing part, and leads from the first flow opening to the second flow opening.

Abstract: A shunt extends from a brush received by a brush box of a brush holder. The first end of the shunt can be connected to the brush, and the second end of the shunt can connect to the brush holder. A lever connects to a back plate of the brush holder, and the lever may reversibly and selectively rotate between a first position and a second position; the lever can have a distal portion, and the second position of the lever secures a portion of the shunt between the distal portion of the lever and another component of the brush holder. The secured portion of the shunt can restrict downward movement of the brush in the brush box, while a spring pushes downward on the brush in the brush in the brush box, to thereby fixedly position the brush in the brush box.

Abstract: An edge trimming mechanism of an edge banding machine capable of removing scraps includes a cutting device and an air guiding cover. The cutting device includes a motor having a power outputting shaft, and a cutter mounted at an end of the power outputting shaft. The air guiding cover is hollow-shaped, installed outside the motor, and has air inlet and outlet. The power outputting shaft protrudes out of the air inlet and the cutter is at least partially located out of the air inlet. An air exhausting path is defined between the inner wall of the air guiding cover and the outer wall of the motor. Two opposite ends of the air exhausting path communicate with the air inlet and outlet respectively. By the above-described configuration of the edge trimming mechanism, it is effective in removing the scraps produced by the edge banding machine in the edge trimming process.

Abstract: A spindle drive assembly for opening or closing a vehicle flap, having a spindle drive assembly housing extending along a spindle drive axis and a spindle drive motor arranged in the spindle drive assembly housing. The motor shaft of the spindle drive motor is arranged substantially coaxially with the spindle drive axis. Furthermore, the spindle drive motor is supported in the spindle drive assembly housing in a rotationally fixed manner in relation to the spindle drive axis by an interlocking fit. In addition, a vehicle flap with such a spindle drive assembly.

Abstract: A motor includes a commutator, a bracket including a conductive brush, first and second wall parts, and first and second deformable parts. The conductive brush is in contact with the commutator. The first wall part includes a first surface extending along a first surface of the conductive brush. The second wall part includes a second surface extending along a second surface of the conductive brush located on a side opposite the first surface of the conductive brush. The first deformable part is in contact with both the first surface of the conductive brush and the first surface of the first wall part, and is deformable in response to movement of the conductive brush. The second deformable part is in contact with both the second surface of the conductive brush and the second surface of the second wall part, and is deformable in response to movement of the conductive brush.

Abstract: The dual rotor electric machine comprises: a stator having one or more slots and one or more stator windings. The dual rotor electric machine further comprises a first rotor arranged to rotate relative to the stator with an airgap therebetween. The first rotor comprises a first rotor excitation element having one or more magnetic pole pairs arranged to interact with the stator windings, the first rotor configured to rotate about an axis (X). The dual rotor electric machine further comprises a second rotor arranged to rotate relative to the stator with an airgap therebetween. The second rotor comprises a second rotor excitation element having one or more magnetic pole pairs arranged to interact with the stator windings, the second rotor being configured to rotate about the axis (X).

Abstract: An electric pump includes a pump housing, a rotor assembly, a stator assembly, an isolation sleeve, a heat dissipation plate and an electric control board. The pump housing defines a pump inner chamber; the pump inner chamber is partitioned into a first cavity and a second cavity by the isolation sleeve; the rotor assembly is disposed in the first cavity; the stator assembly and the electric control board are disposed in the second cavity; the isolation sleeve comprises a bottom portion; at least a portion of the heat dissipation plate is disposed between the electric control board and the bottom portion; at least a portion of the bottom portion and at least a portion of the heat dissipation plate are in direct contact, or are filled with thermal silicone grease or thermal silica therebetween, or are provided with a thermal patch therebetween.

Abstract: Disclosed is a hydraulic control apparatus of a brake system including a modulator block having a motor bore, and a motor including a cover that covers an opening of a case accommodating a stator and a rotor and is supported on one side of the modulator block, wherein a vent hole for air flow between the inside and the outside of the motor is formed on the cover and a communication passage for communicating the motor bore and the vent hole is formed in the modulator block.

Abstract: A drive device for a hydraulic pump of a braking system for a motor vehicle includes a housing, a rotor, a rotor shaft mounted in the housing and supporting the rotor, and a commutator arranged in the housing. The commutator includes at least one commutator brush held by a brush holder. The commutator brush cooperates with a commutator ring arranged on the rotor shaft in a non-rotatable manner. The brush holder includes a sealing ring assigned to the commutator which is arranged coaxially to the rotor shaft and interacts with the rotor shaft in a sealing manner.

Abstract: A motor includes a rotor, a back cover, a housing, and a brush card assembly. The rotor includes a core fixed to a shaft, a coil that magnetizes a core, and a commutator connected to the coil. The back cover includes a back cover bottom surface portion, and a back cover cylindrical portion on an outer periphery of the back cover bottom surface portion to have a cylindrical shape. The brush card assembly includes a brush card bottom surface portion spaced apart from the back cover bottom surface portion in an axial direction through a first gap. The brush card bottom surface holds brushes and includes a nip portion nipped by the back cover and the housing, an outer peripheral wall spaced apart from the back cover cylindrical portion in a radial direction through a second gap, and contact portions contacting the back cover cylindrical portion.

Abstract: This motor includes a yoke housing, a brush holder, a housing case and a circuit board. The brush holder holds a power supply brush and power supply terminals. The housing case has a board containing recess into which front end portions of the power supply terminals are inserted. The circuit board has terminals which are electrically connected to the power supply terminals within the board containing recess. The power supply terminals have terminal connection parts which linearly extend and are arranged in the board containing recess. The terminals are fork terminals which are electrically connected to the terminal connection parts. With respect to the terminal connection parts, portions closer to the base ends than terminal connected positions, where the terminals are connected, are covered by noise reduction member for reducing noise.

Abstract: Electrical contact assemblies for use in rotating video camera heads are disclosed. A contact assembly may include a first element movable relative to the camera head's housing on which an imager is disposed, a second element rotationally movable relative to the first element, and a slip ring including one or more PCB brush elements to transfer imager signals to an output connector.

Abstract: Provided is a decelerator-equipped motor unit which can achieve cost reductions in the control board and improvement of both mechanical and electrical reliability through a particular arrangement of elements on the board, thereby achieving a smaller size by realizing an appropriate board shape without increasing the size of the unit.

Abstract: Brush holder for electric traction motors for locomotives, included in the electrical field, refers to an improvement applied to a brush holder, used in electric traction motors for locomotives, which electric coupling device is especially adapted to sustain, support and press the brush over a commuter of an electric motor rotor, while its body is connected to electric connections, being said device structurally sustained by means of isolated shafts which are connected to the locomotive structure.

Abstract: A motor provided with: a resin sealing member that is made from a resin and that covers a stator; and a cover member that is fixed to the resin sealing member. The protrusions protruding radially outward are formed on the resin sealing member. A part of the cover member on a Z2 direction side thereof is configured as a cylindrical cover section covering the resin sealing member from the outer circumferential side. The cover section has formed therein notch sections, engagement grooves that extend toward one side in the circumferential direction from the ends of the notch sections on a Z1 direction side and with which the protrusions engage, and a stopper restricting movement of the cover member toward the other side in the circumferential direction. The widths of the notch sections are wider than the widths of the protrusions in the circumferential direction.

Abstract: A power tool includes a brush holder with a brush positioned more accurately with respect to a commutator. A grinder as a power tool includes a housing, a stator fixed to the housing, a rotor rotatable relative to the stator and including a commutator and a coil, a brush that comes in contact with the commutator, a brush-holding metal plate having a screw hole and holding the brush, and a screw extending through the screw hole and directly fastened to the housing.

Abstract: A motor includes a rotor, a frame accommodating the rotor, a cover provided at one of two ends of the frame in a direction of a rotor axis, an internal space formed by the frame and the cover and a partition part partitioning the internal space into two spaces. The partition part includes an insertion portion. A part of the cover is inserted into the insertion portion.

Abstract: The electric brake motor unit has: a motor; a connector having a connector terminal; a first section extending in a first direction and having a first contact portion electrically connected to the connector terminal; a second section extending in the first direction and having a second contact portion electrically connected to a motor terminal; and an intermediate section extending in a second direction intersecting with the first direction between the first section and the second section. The electric brake motor unit is provided with: a bus bar in which the first section, the intermediate section, and the second section are connected in a crank shape; and a motor bracket mounted on the motor and having two positioning portions that are mutually separately positioned with a space through which the intermediate section passes and are used for positioning the intermediate section in the first direction.

Abstract: An electric working machine includes a motor, a circuit board having capacitors and choke coils for noise reduction, and a fixing tool for fixing the circuit board to a portion of a case of the motor including motor terminals for power feed. The circuit board includes input terminal members to receive an externally supplied driving power, and a ground connection member electrically coupled to the portion of the case. The capacitors couple the input terminal members to the ground connection member. The choke coils couple the input terminal members to the motor terminals. The ground connection member is arranged in a certain area of the circuit board, which is one of areas on the circuit board defined by dividing the circuit board with a straight line crossing a rotational shaft and is an area where the input terminal members are located. The capacitors are mounted in the certain area.

Abstract: In at least some implementations, an actuator includes a motor, an output rotated by the motor about an axis, and a housing having an interior in which the motor and electrical component are received. The housing includes a first housing part and a second housing part coupled to the first housing part to define at least part of the interior. The first housing part has a first mounting surface and the second housing part having a second mounting surface arranged to overlap the first mounting surface when the second housing part and first housing part are coupled together and wherein the first mounting surface and second mounting surface are both arranged at an acute angle relative to a plane perpendicular to the axis.

Abstract: A sensor target of the present invention is mounted to a movable part (24), which is arranged in parallel with an output shaft (10a) of a motor (10), and is configured to perform a linear motion in a direction parallel to the output shaft (10a). The sensor target includes a magnet (73) and a magnet holder (74) configured to hold the magnet (73). One pair or a plurality of pairs of fitting claws (741) capable of being fitted to an outer peripheral surface of the movable part (24) are formed on the magnet holder (74).

Abstract: The invention relates mainly to an assembly comprising a brush cage and a spiral spring (36), the spiral spring (36) comprising an axis (Y), a wound part (37) wound about the axis (Y) and an arm (39) extending from one end of the wound part (37), the brush cage comprising at least one lateral wall provided with an opening for the passage of the arm (39) through the lateral wall so that one end of the arm (39) can press against at least part of an end face of a brush, wherein the arm (39) comprises a first portion (391) of which the width (L5) measured along the axis (Y) is different from the width (L6) of the wound part (37) measured along the axis (Y) of the spiral spring (36).

Abstract: There is provided an electric actuator including a motor, a first case having a first opening, a second case having a second opening that opens to the other side in the axial direction, a rotation sensor, and a plurality of bus bars which are electrically connected to a plurality of sensor terminals that extend from the rotation sensor and are held in the second case. The first and second cases are fixed to each other while the first opening and the second opening face each other in the axial direction, and parts connecting the plurality of bus bars and the plurality of sensor terminals are disposed at positions shifted from each other in a circumferential direction and radially outward from the rotation sensor. Among the plurality of connecting parts, at least one pair of adjacent connecting parts are disposed at positions different from each other in the radial direction.

Abstract: A power supply apparatus for a field winding motor. A brush is disposed is a holder. An armature is connected to the brush and disposed in the holder. A slip ring is electrically connected to or disconnected from the brush. A support spring surrounds the brush between the slip ring and the armature. A coil is disposed outside of the holder so as to overlap the support spring and the armature. A first power terminal is connected to the brush and supplies a first driving current. A second power terminal is connected to the coil and supplying a second driving current.

Abstract: A deep groove ball bearing assembly is disclosed. The assembly includes an inner bearing ring defining an inner race, an outer bearing ring defining an outer race, and a plurality of rolling elements supported on the inner race and the outer race. A shaft is supported on a radially inner surface of the inner bearing ring, and a housing is supported on a radially outer surface of the outer bearing ring. The assembly includes a contact surface on at least one of: the inner bearing ring, the outer bearing ring, the shaft, or the housing. The contact surface includes at least one lubrication groove.

Abstract: A motor case of a vibration motor has a first tubular part and a first inward flange integrally formed in a flange shape in the inward direction from the upper opening end of the first tubular part. A rotary shaft 30 is supported in an upper oil-impregnated bearing and a lower oil-impregnated bearing, and an upper portion of the rotary shaft protrudes from the motor case. The rotary shaft is inserted into a soft washer, with the soft washer between the rotor unit and the upper oil-impregnated bearing. A weight is eccentrically fixed to the upper portion of the rotary shaft, and an attraction magnet is fixed to the motor case and attracts the weight toward the motor case side. A retainer, which prevents the upper oil-impregnated bearing from coming out in the upward direction, is formed on the motor case.

Abstract: A terminal block connection structure for a rotary electric machine includes: a plurality of power lines configured such that respective first end portions are joined to stator coils of a plurality of phases of the rotary electric machine; terminal metal fittings provided in respective second end portions of the plurality of power lines; a terminal block to which the terminal metal fittings are fixed by respective fastening members; and a resin member integrated with an end part of at least one of the terminal metal fittings relative on an opposite side to the power lines across its corresponding fastening member. The terminal block is configured such that a plurality of power-source lines is connected to the terminal block and the terminal metal fittings are fixed to the terminal block by the respective fastening members so that the plurality of power lines is connected to the plurality of power-source lines, respectively.

Abstract: The invention relates mainly to a brush cage (13) for a brush holder (10) of an electric motor comprising:—two lateral walls (26) and a connecting wall (28) connecting the two lateral walls (26),—in which cage at least one of the lateral walls (26) has an opening (43) for the passage of a spring arm,—the lateral wall (26) comprising the opening (43) having a length (L0) measured between a first end (51) intended to be furthest from a commutator and a second end (52) intended to be closest to the commutator, wherein the opening (43) comprises at least a first portion (431) between the two ends (51, 52) which widens out towards the second end (52).

Abstract: A brush system of an electric motor, having a commutator, at least one brush that is guided within a brush duct and is provided with a connection line, and a spring element that exerts a spring force on the brush when the spring element is effectively connected thereto, such that the brush rests against the commutator; the brush duct includes a longitudinal duct slot inside which the connection line extends and which has a constriction that the connection line penetrates when the effective connection between the spring element and the brush is established.

Abstract: In order to facilitate the assembly of the brush assembly and to improve the productivity, the brush device includes a positive side brush subassembly having a positive side brush for feeding a commutator, a positive side brush holder for holding the positive side brush, and a positive side plate to which the positive side brush holder is attached, and a negative side brush subassembly having a negative side brush for feeding the commutator, a negative side brush holder for holding the negative side brush, and a negative side plate to which the negative side brush holder is attached. The positive side brush subassembly and the negative side brush subassembly are combined with each other.

Abstract: The invention relates mainly to a starter for a heat engine of a motor vehicle comprising: at least one electromagnetic switch comprising a positive output terminal, at least one electric motor, said electric motor comprising: a stator comprising coils, each of the coils being wound around a pole piece to form a pole, at least one brush cage (43), at least one positive brush (35) mounted in said brush cage, an electrical path between said positive brush (35) and the positive output terminal (32), and at least one thermal protection (96) located in said electrical path, in which said thermal protection is able to disconnect said two elements (93, 95) when the thermal protection has a temperature above a temperature threshold for electrically disconnecting said positive output terminal with respect to said positive brush (35).

Abstract: A motor may include a rotating section; and a stationary section. The rotating section may include a shaft, a rotor core, and a coil wound around the rotor core. The stationary section may include a brush holding device, a housing, a magnet, and a bearing. A first circuit board may be retained by the brush holding device. The housing may include a cylindrical portion, a lid portion, and a bottom portion. The brush holding device may include a brush holder, a plug, a first plug contact element, and a second plug contact element, and at least two brushes. The cylindrical portion of the housing may include a through-hole in a radial direction. The plug may be exposed to the outside through the through-hole, and ends in an axial direction of the brush holder may covered by the lid portion and the bottom portion of the housing.

Abstract: A slide-contact portion of a motor has a slide-contact face that contacts a rotating rotor. The slide-contact portion is composed of a material containing an intermetallic compound phase produced by chemical reaction between a first metal which is Sn or an alloy including Sn and a second metal which is a CuNi alloy, a CuMn alloy, an AgPd alloy, a CuAl alloy, or a CuCr alloy.

Abstract: A method of constructing an electrical machine by assembling a first structure (one of a rotor and stator structure) and a second structure (the other of the rotor and stator structure), along with a plurality of first elements (one of a plurality of permanent magnet elements and a plurality of winding elements) and a plurality of second elements (the other plurality of the permanent magnet elements and winding elements). The first elements are attached to a rim of the first structure, and the second elements are attached to the first elements, this attachment being caused by a magnetic attraction. The first structure is assembled with the second structure such that the second elements are positioned for a posterior attachment to a rim of the second structure, and the second elements are attached to the rim of the second structure.

Abstract: Comparison circuitry includes a comparator having a first input configured to receive a pixel signal. A switch is coupled to a second input of the comparator, a reference generator, and a ramp generator. A first capacitance is coupled to the switch. The switch is configured to couple the first capacitance to the reference generator to charge the first capacitance to a reference voltage from the reference generator prior to a ramp event in a ramp signal, and to couple the first capacitance to the ramp signal from the ramp generator at an onset of the ramp event in the ramp signal. The first capacitance is coupled to provide positive current injection into the ramp signal at the onset of the ramp event in the ramp signal to reduce a ramp settling time in the ramp signal, which is provided to the second input of the comparator.

Abstract: Power tools with housings or hammer cases include a thin wall titanium shell tapering from a smaller forward section to a larger rearward section; with at least the rearward section having a wall with a substantially constant wall thickness and an interface flange that includes an outer perimeter profile that is curvilinear and defines a plurality of outwardly extending detents that provide an interference fit with the wall of the hammer case.

Abstract: The present invention is directed to systems for providing a pathway for at least one electrical conductor to supply current from a vehicle or marine craft power source to a steering wheel comprising at least one working element for heating or controls. The present invention utilizes a brush and slip ring assemblies inside a hub for infinite rotation of the steering wheel while still maintaining a path for current to travel through the hub to the wheel.

Abstract: A linear actuator includes a housing with an electric motor, which through a transmission drives a spindle with a spindle nut. To the spindle nut is secured a tubular adjustment element, which is guided in a guide tube. A bushing is secured at the rear end of the guide tube for securing the guide tube to the chassis of the actuator. Expediently, the securing is done with stampings from the outer side of the mounting bushing and into the guide tube. These stampings are appropriately done opposite channels, such as screw channels in the guide tube, such that the stampings are received in the channels and do not protrude into the guide tube and prevent the movement of the spindle nut and the adjustment element.

Abstract: The present invention relates to a motor and a brake device including the same, wherein the motor including: a rotary shaft; a rotor part in which the rotary shaft is disposed at the center thereof; a stator part disposed on the outside of the rotor part; a housing accommodating the rotor part and the stator part, and having an opening formed at one side thereof; and a motor cover disposed at the opening of the housing, wherein the motor cover includes: a motor cover body; a first protruding part and a second protruding part, which are each formed at a predetermined location and configured to protrude in the radial direction from the center of the motor cover body; and a third protruding part formed to protrude from an edge of the motor cover body, and a sealing part is further disposed between the second protruding part and the end portion of the housing disposed between the second protruding part and the third protruding part.

Abstract: A rotor includes a magnet yoke and a number of permanent magnets. The magnet yoke defines a number of accommodating slots therein, and each of the permanent magnets is received in one of the accommodating slots. An elastic member protrudes from the magnet yoke towards each of the accommodating slots, the permanent magnets are inserted in the corresponding accommodating slots, and the elastic members are bent and abut against the permanent magnets. A motor and a power tool include the rotor are also disclosed.