A cooling fan module includes a fan and a PMDC motor. The PMDC motor includes a stator and a rotor. The stator has 2P magnetic poles. The rotor includes a rotary shaft, a rotary core, a commutator, and a winding. The rotor core includes m×P pole teeth. The commutator includes k×m×P commutator segments. Adjacent pole teeth define therebetween winding slots for receiving the winding. The winding includes winding units each having P coils. Each of two ends of each winding unit includes a lead-out line connected to the commutator segment. Any two lead-out lines extending out of different winding slots are spaced from each other at locations outside the commutator segments.

A cooling fan module includes a fan and a PMDC motor. The PMDC motor includes a stator and a rotor. The stator has 2P magnetic poles. The rotor includes a rotary shaft, a rotary core, a commutator, and a winding. The rotor core includes m×P pole teeth. The commutator includes k×m×P commutator segments. Adjacent pole teeth define therebetween winding slots for receiving the winding. The winding includes winding units each having P coils. Each of two ends of each winding unit includes a lead-out line connected to the commutator segment. Any two lead-out lines extending out of different winding slots are spaced from each other at locations outside the commutator segments.

Disclosed are various embodiments for a new and improved electric motor/generator including a toroidal magnetic cylinder centered on the longitudinal axis, and a coil assembly including a first coil assembly support positioned within the toroidal magnetic cylinder, and a second coil assembly support positioned within the toroidal magnetic cylinder.

An asymmetrical, direct current excited brushed motor may include a motor shaft; a commutator with a number of lamellae arranged in the circumferential direction; an armature with a number of armature teeth and armature grooves, where anchor windings are arranged in the armature grooves to form coils; at least one brush pair for supplying the coils with power, including two brushes contacting the lamellae; and a number n of permanent magnets in the stator to form a magnetic field, where n is a multiple of 2 and n>2, and where the number of armature teeth is unequal to a multiple of n. A position angle between the brushes of a brush pair is equal to or less than 90 and unequal to a multiple of the position angle between two directly consecutive lamellae.

An asymmetrical, direct current excited brushed motor may include a motor shaft; a commutator with a number of lamellae arranged in the circumferential direction; an armature with a number of armature teeth and armature grooves, where anchor windings are arranged in the armature grooves to form coils; at least one brush pair for supplying the coils with power, including two brushes contacting the lamellae; and a number n of permanent magnets in the stator to form a magnetic field, where n is a multiple of 2 and n>2, and where the number of armature teeth is unequal to a multiple of n. A position angle between the brushes of a brush pair is equal to or less than 90 and unequal to a multiple of the position angle between two directly consecutive lamellae.

A power tool includes a motor, a first power source access circuit, a first drive circuit, a second power source access circuit and a second drive circuit. The motor includes a rotor, a stator, a plurality of first-type windings and a plurality of second-type windings. The rotor is configured to rotate about a central axis. The stator includes a ring-shaped yoke portion, and a plurality of teeth. The plurality of first-type windings are configured to be wound around part of the plurality of teeth and the plurality of second-type windings are configured to be wound around other part of the plurality of teeth. The first power source access circuit is configured to access a first power source with a first voltage. The first drive circuit includes a plurality of first-type electronic switches connected between the plurality of first-type windings and the first power source access circuit. The second power source access circuit is configured to access a second power source with a second voltage. The second drive circuit includes a plurality of second-type electronic switches connected between the plurality of second-type windings and the second power source access circuit. The plurality of first-type windings and the plurality of second-type windings are spaced in a circumferential direction of the central axis.

A power tool includes a motor, a first power source access circuit, a first drive circuit, a second power source access circuit and a second drive circuit. The motor includes a rotor, a stator, a plurality of first-type windings and a plurality of second-type windings. The rotor is configured to rotate about a central axis. The stator includes a ring-shaped yoke portion, and a plurality of teeth. The plurality of first-type windings are configured to be wound around part of the plurality of teeth and the plurality of second-type windings are configured to be wound around other part of the plurality of teeth. The first power source access circuit is configured to access a first power source with a first voltage. The first drive circuit includes a plurality of first-type electronic switches connected between the plurality of first-type windings and the first power source access circuit. The second power source access circuit is configured to access a second power source with a second voltage. The second drive circuit includes a plurality of second-type electronic switches connected between the plurality of second-type windings and the second power source access circuit. The plurality of first-type windings and the plurality of second-type windings are spaced in a circumferential direction of the central axis.

The invention relates to electrical engineering, in particular to electromagnetic devices. Brushless motor generator is disclosed, which includes a rotor with a permanent magnet and a stator, the windings of which have a rounded cross-section. According to the invention, the rotor is made in the form of a shaft with a permanent magnet fixed on it. The magnetic field vector of the poles of the magnet is perpendicular to the axis of rotation of the shaft. The stator is spherical, covering the magnet, and the axis of symmetry of the stator coincides with the axis of rotation of the shaft. From 1 to 12 windings are wound on the outer spherical surface of the stator; the windings forming the coils with uniformly offset poles relative to each other.

According to the present invention, a coil is continuously wound in a single pass around each of a series of teeth, and connected to each segment.

A brush motor includes: a rotor core provided in a rotor; s teeth provided in the rotor core; s concentrated-winding coils with electric wires being respectively wound around the teeth; a commutator provided on the rotor in a relatively non-rotatable manner; c commutator pieces provided in the commutator and connected to the coils; p pairs of magnet magnetic poles provided on a stator and arranged to face the teeth; and a brush that is brought into sliding contact with the commutator pieces to supply a current to the coils, in which 0.5<p/s<1 and s<c.