A brushless electric motorsystem having integrated power stages, said electric motor system comprising a rotor, a stator, a plurality of power stages, and a cooling system comprising a substantially flat hollow main cool body arranged to support the flowing of a cooling medium inside said hollow main cool body for cooling said main cool body, a base cooling plate connected to a first flat surface of said hollow main cool body and to said plurality of power stages for transferring heat between said plurality of power stages and said base cool plate, heat resistance inserts connected to said base cooling plate and said plurality of electrically excitable coils for transferring heat between said plurality of coils and said base cooling plate wherein said heat resistance inserts provide for a thermal conductivity, thereby creating a thermal buffer such that said electrically excitable coils are cooled less compared to said power stages, by said cooling system.

A brushless electric motorsystem having integrated power stages, said electric motor system comprising a rotor, a stator, a plurality of power stages, and a cooling system comprising a substantially flat hollow main cool body arranged to support the flowing of a cooling medium inside said hollow main cool body for cooling said main cool body, a base cooling plate connected to a first flat surface of said hollow main cool body and to said plurality of power stages for transferring heat between said plurality of power stages and said base cool plate, heat resistance inserts connected to said base cooling plate and said plurality of electrically excitable coils for transferring heat between said plurality of coils and said base cooling plate wherein said heat resistance inserts provide for a thermal conductivity, thereby creating a thermal buffer such that said electrically excitable coils are cooled less compared to said power stages, by said cooling system.

An electric machine comprising a first carrier having an array of electromagnetic elements and a second carrier having electromagnetic elements defining magnetic poles, the second carrier being arranged to move relative to the first carrier. An airgap is provided between the first carrier and the second carrier. The electromagnetic elements of the first carrier include posts, with slots between the posts, one or more electric conductors in each slot, the posts of the first carrier having a post height in mm. The first carrier and the second carrier together define a size of the electric machine. The magnetic poles having a pole pitch in mm. The size of the motor, pole pitch and post height are selected to fall within a region in a space defined by size, pole pitch and post height that provides a benefit in terms of force or torque per weight per excitation level.

An electric machine comprising a first carrier having an array of electromagnetic elements and a second carrier having electromagnetic elements defining magnetic poles, the second carrier being arranged to move relative to the first carrier. An airgap is provided between the first carrier and the second carrier. The electromagnetic elements of the first carrier include posts, with slots between the posts, one or more electric conductors in each slot, the posts of the first carrier having a post height in mm. The first carrier and the second carrier together define a size of the electric machine. The magnetic poles having a pole pitch in mm. The size of the motor, pole pitch and post height are selected to fall within a region in a space defined by size, pole pitch and post height that provides a benefit in terms of force or torque per weight per excitation level.

An electric motor is disclosed having a detachable stator tooth. In some implementations, coil windings of the electric motor may be coupled to one or more drivers independently of other coil windings. A method of repairing and manufacturing an electric motor having a detachable stator tooth is also disclosed.

An electric motor is disclosed having a detachable stator tooth. In some implementations, coil windings of the electric motor may be coupled to one or more drivers independently of other coil windings. A method of repairing and manufacturing an electric motor having a detachable stator tooth is also disclosed.

A rotor for an electric machine having posts extending partially or completely between end irons. Each end iron is formed of a single piece of magnetic material with the posts extending from it, including the other end iron where the posts extend completely between them. Magnets are arranged between the posts with poles facing the posts to concentrate flux. In order to prevent too much of the flux from being drawn into flux paths through the end irons, the total magnetic flux is made to exceed a saturation flux of at least a portion of the flux path. This may be achieved by using interdigitated posts extending only partially between the end irons to provide gaps in the flux path, by providing flux resistors in the end irons to reduce a saturation flux below the total flux, or by using high aspect ratio magnets or posts so that the magnetic flux exceeds a saturation flux of the posts or end irons.

Provided is an armature core of a rotary electric machine according to the present invention including a shoe provided as a separate part with respect to each magnetic pole tooth. An arc-shaped cutout is formed in a distal end of the magnetic pole tooth, and the shoe part includes a circular portion. Through fitting between the arc-shaped cutout and the circular portion, the magnetic pole tooth and the shoe part are coupled together. The shoe part is configured to be rotatable with respect to the magnetic pole tooth with a circumference of the circular portion serving as a guide.

Provided is an armature core of a rotary electric machine according to the present invention including a shoe provided as a separate part with respect to each magnetic pole tooth. An arc-shaped cutout is formed in a distal end of the magnetic pole tooth, and the shoe part includes a circular portion. Through fitting between the arc-shaped cutout and the circular portion, the magnetic pole tooth and the shoe part are coupled together. The shoe part is configured to be rotatable with respect to the magnetic pole tooth with a circumference of the circular portion serving as a guide.

A stator core includes plate-shaped core members laminated to define the stator core. Each core member includes an annular core back portion, and tooth portions that project radially inward from an inner circumferential surface of the core back portion. The core back portion includes at least one recessed portion recessed radially inward from an outer circumferential surface of the core back portion, and at least one welded portion arranged at a corresponding one of the at least one recessed portion to join axially adjacent ones of the core members. The at least one recessed portion is recessed in a radial direction is in a range of about 0.2 mm to about 1.5 mm, both inclusive.