A motor includes a stationary structure, and a rotor rotatable about a central axis with respect to the stationary structure. The stationary structure includes a stator including a coil, a bracket that supports the stator, and a circuit board disposed between the stator and the bracket. The bracket includes a board support that holds the circuit board between the bracket and the stator in an axial direction. The board support includes a wiring through hole that penetrates the board support in the axial direction and through which a wire extending from the circuit board passes, a lid that partially covers the wiring through hole, and a guide bridge that is located inside the wiring through hole when viewed in the axial direction and holds the wire between the lid and the guide bridge.

A machine tool control device according to the present invention includes a feedback counter for obtaining A- and B-phase signals of rectangular waves or sine waves and a one-rotation signal, which are outputted from a sensor for detecting the position or speed of a driven axis or a motor, to calculate a feedback count value that is a count value of the number of feedback pulses generated from the A- and B-phase signals; a feedback count value storage unit for storing an inter-one-rotation-signal feedback count value that is the feedback count value counted between the two sequential one-rotation signals; a reference value storage unit for storing an anomaly determination reference value corresponding to the inter-one-rotation-signal feedback count value; and an anomaly cause determination unit for determining the cause of an anomaly by comparison between the inter-one-rotation-signal feedback count value and the anomaly determination reference value.

A DC brushless motor is provided, which includes a housing, a motor assembly, a control board and a dividing plate. Wherein, the motor assembly is arranged in the housing, and a connecting terminal is arranged on it. The control board is arranged in the housing and electrically connected with the connecting terminal. The dividing plate is arranged in the housing and is used to divide the motor assembly from the control board. The disclosure is used to solve a problem of complicated internal wiring of a motor caused by a division of the motor and a controller of the conventional DC brushless motor.

A motor system includes a brushless motor with a stator, a rotor having a first number of rotor poles, and a motor shaft connected to the rotor. The motor system also includes control electronics configured to control a brushless motor that has a second, number of rotor poles, different from the first number of rotor poles. The second number of rotor poles is an integer multiple, N, of the first number of rotor poles. A position sensor is communicatively connected to the control electronics. A first gear is mounted on the motor shaft and connected for rotation with the motor shaft, the first gear having a first number of teeth. A second gear is engaged with the first gear, the second gear having a second number of gear teeth. The position sensor is configured to detect an angular position of the second gear and provide it to the control electronics.

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 an inner body mounted on the rotor shaft and radial projections projecting outwardly from the inner body, a permanent magnet mounted on an outer end of the radial projections, and a mold structure formed in contact with the radial projections and configured to 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 an inner body mounted on the rotor shaft and radial projections projecting outwardly from the inner body, a permanent magnet mounted on an outer end of the radial projections, and a mold structure formed in contact with the radial projections and configured to secure the permanent magnet to the rotor core.

An electric tool is provided with a rotary striking mechanism unit converting the rotational force of a brushless motor to a striking force and applying the striking force to a tip tool. The required rated input of the motor is 1000-1300 W, the motor speed under fixed speed control is 1680010% (min.sup.1), and the variable Ku, which relates to the motor, is defined by the following expression Ku={(stator core outer diameter).sup.2(stator core lamination thickness)(total tooth width)(rotor outer diameter)}{(rated input)(motor speed under fixed speed control)}, wherein the stator core outer diameter, the stator core lamination thickness, the total tooth width and the rotor outer diameter are shown in mm, the rated input is shown in W, the motor speed is shown in min.sup.1, and the Ku value of the motor is set to 14.6<=Ku<=21.8.

An electric tool is provided with a rotary striking mechanism unit converting the rotational force of a brushless motor to a striking force and applying the striking force to a tip tool. The required rated input of the motor is 1000-1300 W, the motor speed under fixed speed control is 1680010% (min.sup.1), and the variable Ku, which relates to the motor, is defined by the following expression Ku={(stator core outer diameter).sup.2(stator core lamination thickness)(total tooth width)(rotor outer diameter)}{(rated input)(motor speed under fixed speed control)}, wherein the stator core outer diameter, the stator core lamination thickness, the total tooth width and the rotor outer diameter are shown in mm, the rated input is shown in W, the motor speed is shown in min.sup.1, and the Ku value of the motor is set to 14.6<=Ku<=21.8.

A brushless direct current (DC) motor, including a motor body and a motor controller. The motor controller includes a control box and a control circuit board. The motor body is a plastic-packaged body including a rotary shaft, a rotor assembly, a plastic-packaged stator, a front cover, and a rear cover. The rotor assembly is disposed on the rotary shaft. The plastic-packaged stator is sleeved on the outer side of the rotor assembly. The front cover is disposed on the front part of the plastic-packaged stator. The plastic-packaged stator includes a stator core, a terminal insulator, coil windings, and a plastic-packaged shell. The terminal insulator is disposed on one end of the stator core. The coil windings are coiled on the terminal insulator. The plastic-packaged shell is adapted to connect the stator core, the terminal insulator, and the coil windings together.

A brushless direct current (DC) motor, including a motor body and a motor controller. The motor controller includes a control box and a control circuit board. The motor body is a plastic-packaged body including a rotary shaft, a rotor assembly, a plastic-packaged stator, a front cover, and a rear cover. The rotor assembly is disposed on the rotary shaft. The plastic-packaged stator is sleeved on the outer side of the rotor assembly. The front cover is disposed on the front part of the plastic-packaged stator. The plastic-packaged stator includes a stator core, a terminal insulator, coil windings, and a plastic-packaged shell. The terminal insulator is disposed on one end of the stator core. The coil windings are coiled on the terminal insulator. The plastic-packaged shell is adapted to connect the stator core, the terminal insulator, and the coil windings together.