An electric motor includes a cylindrical rotor with a plurality of wires parallel to the cylindrical axis nested between two cylinders of magnets in a stator. The cylinders of magnets may be a solid magnet, a plurality of bar magnets, a plurality of coils generating magnetic fields or other magnets or generated magnetic fields. A nested electric motor includes a first electric motor additionally including a first shaft, which first electric motor nests within the hollow center of a second larger electric motor additionally including a second shaft. The first shaft is coaxial with the second shaft.

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.

A fluid pump includes an electric motor having an armature with a commutator and a motor frame which supports a pair of permanent magnets which are located radially outward from the armature. The motor frame has a support stem extending axially in a direction away from the commutator. A pump section is rotationally coupled to the electric motor and pumps the fluid. First and second motor brushes deliver electricity to the commutator and are urged into electrical contact with the commutator by a first and second springs. The first and second springs are mechanically grounded to a brush spring retainer fixed to the motor frame. The brush spring retainer includes a central portion having an opening within which the support stem is received in an interference fit. A support arm extends from the central portion such that the first and second springs are mechanically grounded to the support arm.

A fluid pump includes an electric motor having an armature with a commutator and a motor frame which supports a pair of permanent magnets which are located radially outward from the armature. The motor frame has a support stem extending axially in a direction away from the commutator. A pump section is rotationally coupled to the electric motor and pumps the fluid. First and second motor brushes deliver electricity to the commutator and are urged into electrical contact with the commutator by a first and second springs. The first and second springs are mechanically grounded to a brush spring retainer fixed to the motor frame. The brush spring retainer includes a central portion having an opening within which the support stem is received in an interference fit. A support arm extends from the central portion such that the first and second springs are mechanically grounded to the support arm.

A motor includes a frame having an outer diameter of 10 millimeters or less and an inner surface. The motor also includes an annular magnet attached to the inner surface of the frame, a bracket provided at the frame, and a columnar brush formed of carbon and having an outer peripheral surface. In addition, the motor includes a commutator contacting the outer peripheral surface of the brush, and an elastic member supporting the brush at the bracket. A part of the elastic member is disposed inside of the columnar brush.

Provided is a permanent magnet brush micromotor and an assembly method thereof. Its upper stator bracket and lower stator bracket are designed to fit together, and the concave parts of the upper stator bracket and lower stator bracket are matched to form a complete mounting cavity for mounting a motor shaft, core winding, bearings and commutator. The core winding, bearings and commutator are installed on the motor shaft to form a mover assembly, and then the mover assembly is installed in the concave part of the lower stator bracket. Finally, combining and fixing the upper stator bracket and lower stator bracket with electric brushes which are respectively placed in brush mounting positions. And, two bearings are fixed or pressed on the same component, so that the concentricity and coaxiality of the bearings can be ensured, the compression of the central biasing force is avoided during assembly.

Provided is a permanent magnet brush micromotor and an assembly method thereof. Its upper stator bracket and lower stator bracket are designed to fit together, and the concave parts of the upper stator bracket and lower stator bracket are matched to form a complete mounting cavity for mounting a motor shaft, core winding, bearings and commutator. The core winding, bearings and commutator are installed on the motor shaft to form a mover assembly, and then the mover assembly is installed in the concave part of the lower stator bracket. Finally, combining and fixing the upper stator bracket and lower stator bracket with electric brushes which are respectively placed in brush mounting positions. And, two bearings are fixed or pressed on the same component, so that the concentricity and coaxiality of the bearings can be ensured, the compression of the central biasing force is avoided during assembly.

A system includes a first module that: receives the output current from the electric motor as a feedback, the output current including a direct axis component and a quadrature axis component; and generates a first voltage command based on a virtual resistance value, the feedback, and a targeted frequency characteristic of the motor control system. The system includes: a second module that: receives a difference between the feedback and a commanded current; and generates a second voltage command based on an estimated inductance value, an estimated resistance value of an electric motor, the virtual resistance value, a targeted frequency response characteristic of the motor control system, and the response of the d-axis component of the output current being decoupled from the response of the q-axis component. The system includes an addition module that generates an input voltage command for the electric motor by adding the first and second voltage commands.

A permanent magnet machine includes a rotor and an irregular polyhedron shaped magnet assembly. The rotor may define at least one magnet opening and may be configured to rotate within a circular opening defined by a stator. The irregular polyhedron shaped magnet assembly may be disposed in the magnet opening and may define a magnetization direction, wherein a height along the magnetization direction and perpendicular with a lamination plane of the rotor is greater at both ends than at a central portion disposed therebetween.