Abstract: A brushless direct current motor includes a rotor made up of at least one permanent magnet and a stator having at least three partitions radially extending from a circular based cylindrical main body, the partitions together defining at least two volumes for receiving at least three coils generating a magnetic field, wherein each volume is closed by a wall connecting the partitions, and in that the wall comprises, on the face thereof oriented toward the rotor, at least one magnetic restriction zone. A sleeve surrounds the stator and the rotor and has at least one deformation zone formed by cutouts adapted to maintain the external geometrical configuration of the sleeve when mounting the constituent elements of the motor. A method for manufacturing such a motor.

Abstract: The invention relates to a brushless direct current motor, having a rotor made up of at least one permanent magnet and a stator having at least three partitions (160) radially extending from a circular based cylindrical main body (170), the partitions (160) together defining at least two volumes for receiving at least three coils generating a magnetic field, wherein each volume is closed by a wall (170) connecting the partitions (160), and in that the wall comprises, on the face thereof oriented toward the rotor, at least one magnetic restriction zone. A sleeve (4) surrounds the stator and the rotor and has at least one deformation zone formed by cutouts (11) adapted to maintain the external geometrical configuration of the sleeve (4) when mounting the constituent elements of the motor. The invention also relates to a method for manufacturing such a motor.

Abstract: A method for reducing a cogging torque produced by at least two brushless electric motors used simultaneously includes determining a period of the cogging torque for each of the two brushless electric motors and putting the period for each motor into phase opposition. Each of the brushless electric motors may include a rotor connected to an output shaft and a stator. The rotor may include at least one permanent magnet, and the stator may have at least two receiving volumes for at least three coils generating a magnetic field.

Abstract: The invention relates to a method for reducing the cogging torque (C1, C2) produced by at least two brushless electric motors used simultaneously, said motors comprising a rotor connected to an output shaft and composed of at least one permanent magnet, and a stator comprising at least two receiving volumes for at least three coils generating a magnetic field, characterized in that it comprises at least the following steps: a) determining the period of the cogging torque (C1, C2) for each motor, b) putting into phase opposition the periods for each motor (1, 2) determined in step a).

Abstract: The invention relates to a brushless direct current motor, comprising a rotor made up of at least one permanent magnet and a stator comprising at least three partitions (160) radially extending from a circular based cylindrical main body (170), said partitions (160) together defining at least two volumes for receiving at least three coils generating a magnetic field, characterized in that each volume is closed by a wall (170) connecting said partitions (160), and in that said wall comprises, on the face thereof oriented toward the rotor, at least one magnetic restriction zone. A sleeve (4) surrounds the stator and the rotor and comprises at least one deformation zone formed by cutouts (11) adapted to maintain the external geometrical configuration of the sleeve (4) when mounting the constituent elements of the motor. The invention also relates to a method for manufacturing such a motor.