A brushless direct-current (BLDC) motor for a power tool includes a rotor assembly; a stator assembly including a stator having stator teeth forming slots therebetween and stator windings wound around the stator teeth; stator terminals extending substantially parallel to the longitudinal axis from the stator assembly and being substantially aligned with centerlines of the slots of the stator assembly; and a circuit board mounted on the stator terminals adjacent the stator assembly. The circuit board includes conductive traces facilitating a one of a delta or a series connection between the stator windings. An end insulator is provided at an axial end of the stator to electrically insulate the stator from the stator windings, the end insulator including support members to support the stator terminals relative to the stator assembly. The circuit board is mounted and fastened to the support members.

A variable-speed direct current motor comprising a stator (22), a rotor (23) arranged within the stator, and a motor drive device (40) arranged partly at the stator and partly at the rotor, wherein the stator comprises a yoke (25) defining a cylindrical cavity (31), and a plurality of permanent magnets (24) arranged at the yoke, wherein the rotor comprises a cylindrical core (26) and a conductor structure (47) arranged at the core, wherein the motor drive device comprises an alternating current transformer (41) having a primary winding (42) arranged at the stator and a secondary winding (43) arranged at the rotor, a rectifier device (44) arranged at the rotor and connected with the secondary winding, a direct current supply device (45) arranged at the rotor (23) and connected with the rectifier device (44), and with the conductor structure (47), and an operation control device (48) comprising a first unit (49) arranged at the rotor (23) and a second unit (50) arranged externally of the rotor and wirelessly communicating with the first unit.

A high-speed Hall-less three-phase vacuum cleaner motor may include an iron core with a central circle, a rotor running through the central circle, a first end cap for fixing one end of the iron core, a second end cap mating with the first end cap and fixing the other end of the iron core, a movable impeller located at one side of the second end cap, an impeller cover receiving the movable impeller and fixed on the second end cap, a fixed impeller located between the second end cap and the movable impeller, and a circuit board. The circuit board may be provided with a Hall sensor-less circuit cooled by wind output by the motor, and the rotational speed of the motor controlled by the Hall sensor-less circuit is higher than 80000 rotations per minute. The structure is simple, the appearance is beautiful, and the reliability is high.

A brushless direct-current (BLDC) motor is provided. The motor includes a stator including a stator core, stator teeth, and windings; a rotor shaft disposed within the stator and extending along a longitudinal axis; and a rotor. The rotor includes a rotor core including a body extending around the longitudinal axis, a permanent magnet mounted on the body of the rotor core, and a mold structure formed at least partially through the rotor core. In an embodiment, the mold structure engages two axial ends of the permanent magnet to axially retain the permanent magnet relative to the rotor core and integrally forms a fan adjacent the rotor core. In an embodiment, the permanent magnet includes at least one tooth extending from an axial end thereof and having angled side edges, and the mold structure engages the at least one tooth to fixedly secure the permanent magnet to the rotor core.

A brushless direct-current (BLDC) motor is provided. The motor includes a stator including a stator core, stator teeth, and windings; a rotor shaft disposed within the stator and extending along a longitudinal axis; and a rotor. The rotor includes a rotor core including a body extending around the longitudinal axis, a permanent magnet mounted on the body of the rotor core, and a mold structure formed at least partially through the rotor core. In an embodiment, the mold structure engages two axial ends of the permanent magnet to axially retain the permanent magnet relative to the rotor core and integrally forms a fan adjacent the rotor core. In an embodiment, the permanent magnet includes at least one tooth extending from an axial end thereof and having angled side edges, and the mold structure engages the at least one tooth to fixedly secure the permanent magnet to the rotor core.

[Object] To detect a rotational angle accurately and also to drive more safely. [Solution] Provided is an actuator (300) including: a reduction gear (320) that reduces, by a certain reduction ratio, a rotational velocity of an input shaft joined to a rotary shaft of a motor (360), and transmits the reduced rotational velocity to an output shaft (350); a first absolute angle encoder (330) that detects a rotational angle of the input shaft; and a second absolute angle encoder (340) that detects a rotational angle of the output shaft.

The present invention is concerning the control device equipped with a motor 2 and a control unit 1 which is coaxial to the motor 2. An upper frame 40 is arranged at a boundary between the motor 2 and the control unit 1. A semiconductor module 35, an intermediate member 50, and a control board 3 are provided in the control unit 1. For assembly of the semiconductor module 35 and the intermediate member 50, a latch portion 35f is provided on one of the semiconductor module 35 and the intermediate member 50, and an engaged portion into which the latch portion 35f locks is provided on the other of the semiconductor module 35 and the intermediate member 50, whereby positioning of the semiconductor module 35 and the intermediate member 50 is achieved.

The present invention is concerning the control device equipped with a motor 2 and a control unit 1 which is coaxial to the motor 2. An upper frame 40 is arranged at a boundary between the motor 2 and the control unit 1. A semiconductor module 35, an intermediate member 50, and a control board 3 are provided in the control unit 1. For assembly of the semiconductor module 35 and the intermediate member 50, a latch portion 35f is provided on one of the semiconductor module 35 and the intermediate member 50, and an engaged portion into which the latch portion 35f locks is provided on the other of the semiconductor module 35 and the intermediate member 50, whereby positioning of the semiconductor module 35 and the intermediate member 50 is achieved.

A variable-speed direct current motor comprising a stator (22), a rotor (23) arranged within the stator, and a motor drive device (40) arranged partly at the stator and partly at the rotor, wherein the stator comprises a yoke (25) defining a cylindrical cavity (31), and a plurality of permanent magnets (24) arranged at the yoke, wherein the rotor comprises a cylindrical core (26) and a conductor structure (47) arranged at the core, wherein the motor drive device comprises an alternating current transformer (41) having a primary winding (42) arranged at the stator and a secondary winding (43) arranged at the rotor, a rectifier device (44) arranged at the rotor and connected with the secondary winding, a direct current supply device (45) arranged at the rotor (23) and connected with the rectifier device (44), and with the conductor structure (47), and an operation control device (48) comprising a first unit (49) arranged at the rotor (23) and a second unit (50) arranged externally of the rotor and wirelessly communicating with the first unit.

A brushless direct-current (BLDC) motor for a power tool includes a rotor assembly and a stator assembly including stator windings. A ratio of a motor size (Km) constant of the motor to an electrical envelope of the motor including electrical parts of the motor is greater than approximately 850 (N.m/W)/m{circumflex over ()}3. A ratio of a motor size (Km) constant of the motor to a magnetic envelope of the motor including stator core and windings is greater than approximately 980 (N.m/W)/m{circumflex over ()}3.