A PMDC motor has a housing, a stator magnet disposed in an interior of the housing, and a rotor core disposed within the stator magnet. A ratio of an outer diameter of the rotor core to the outer diameter of the housing is from 0.60 to 0.67. The noise of the motor during operation is reduced by increasing the thickness of the stator magnet, reducing the outer diameter of the rotor core, reducing the air gap between the magnet and the rotor core and reducing the rotational inertia of the rotor core. The motor is particularly suited for use in vehicle HVAC systems where low noise is an important requirement.

A PMDC motor has a housing, a stator magnet disposed in an interior of the housing, and a rotor core disposed within the stator magnet. A ratio of an outer diameter of the rotor core to the outer diameter of the housing is from 0.60 to 0.67. The noise of the motor during operation is reduced by increasing the thickness of the stator magnet, reducing the outer diameter of the rotor core, reducing the air gap between the magnet and the rotor core and reducing the rotational inertia of the rotor core. The motor is particularly suited for use in vehicle HVAC systems where low noise is an important requirement.

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.

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.

An electric motor includes a yoke having six magnetic poles; a rotary shaft which is provided inside the yoke in a freely rotatable manner; an armature core (6) which has teeth (36) attached to the rotary shaft, radially extending in a radial direction and set in an arrangement of an even number, and an even number of slots (37) formed between the teeth; an armature coil (7) which is wound around the teeth in a single wave winding; and a commutator (13) which is provided in the rotary shaft to be adjacent to the armature core (6) and has a plurality of circumferentially disposed segments (41) to which the armature coil (7) is connected.

An electric motor includes a yoke having six magnetic poles; a rotary shaft which is provided inside the yoke in a freely rotatable manner; an armature core (6) which has teeth (36) attached to the rotary shaft, radially extending in a radial direction and set in an arrangement of an even number, and an even number of slots (37) formed between the teeth; an armature coil (7) which is wound around the teeth in a single wave winding; and a commutator (13) which is provided in the rotary shaft to be adjacent to the armature core (6) and has a plurality of circumferentially disposed segments (41) to which the armature coil (7) is connected.

Disclosed are various embodiments for an improved generator/motor and a method of generating current, the method comprising providing a circular rotation path, generating a concentrated magnetic field around a portion of the circular rotation path; rotating a coil along the circular path and through the concentrated magnetic field; generating current within the coil as a result of the rotating, and extracting the current from the coil.

Disclosed are various embodiments for an improved generator/motor and a method of generating current, the method comprising providing a circular rotation path, generating a concentrated magnetic field around a portion of the circular rotation path; rotating a coil along the circular path and through the concentrated magnetic field; generating current within the coil as a result of the rotating, and extracting the current from the coil.

The invention relates to a commutator motor (10), particularly as part of a windscreen-wiper motor (100), having at least four magnet elements (11 to 14) which are arranged on a reference-circle diameter around an axis of rotation of an armature shaft (2) with polarity that alternates in the circumferential direction, and having an armature (15) with armature slots (N1 to N18) and armature teeth (Z1 to Z18), wherein winding wires (20) having a multiplicity of windings (27, 28) in each case for constructing coils (C1 to C9) are arranged in the armature slots (N1 to N18), wherein a start (21) and an end (22) of a winding wire (20) is electrically conductively connected to a commutator hook (H1 to H18) in each case, wherein a winding wire (20) has two winding-wire sections (25, 26), which are arranged in the region of different magnet elements (11 to 14) in such a manner that a first winding-wire section (25) with a first number of windings (27) in a first winding direction is assigned to a first magnet element (11 to 14) and is located in two armature slots (N1 to N18), and that a second winding-wire section (26) with a second number of windings (28) in a second winding direction, opposite to the first winding direction, is assigned to a second magnet element (11 to 14) and is located in two armature slots (N1 to N18), and wherein the two magnet elements (11 to 14) have different polarities.

The invention relates to a commutator motor (10), particularly as part of a windscreen-wiper motor (100), having at least four magnet elements (11 to 14) which are arranged on a reference-circle diameter around an axis of rotation of an armature shaft (2) with polarity that alternates in the circumferential direction, and having an armature (15) with armature slots (N1 to N18) and armature teeth (Z1 to Z18), wherein winding wires (20) having a multiplicity of windings (27, 28) in each case for constructing coils (C1 to C9) are arranged in the armature slots (N1 to N18), wherein a start (21) and an end (22) of a winding wire (20) is electrically conductively connected to a commutator hook (H1 to H18) in each case, wherein a winding wire (20) has two winding-wire sections (25, 26), which are arranged in the region of different magnet elements (11 to 14) in such a manner that a first winding-wire section (25) with a first number of windings (27) in a first winding direction is assigned to a first magnet element (11 to 14) and is located in two armature slots (N1 to N18), and that a second winding-wire section (26) with a second number of windings (28) in a second winding direction, opposite to the first winding direction, is assigned to a second magnet element (11 to 14) and is located in two armature slots (N1 to N18), and wherein the two magnet elements (11 to 14) have different polarities.