A method for controlling a planar drive system includes determining values of magnetic stator fields for different energizing currents and spatial regions in a two-dimensional array of magnetic field sensors, generating at least one magnetic stator field by applying energizing currents to stator conductors to electrically control a rotor, determining measured values of a total magnetic field via the magnetic field sensors for a plurality of the spatial regions to determine a position of the rotor, compensating contributions of the magnetic stator fields to the measured values of the total magnetic field determined by the magnetic field sensors, generating measured values of the magnetic field determined by the respective magnetic field sensors for the respective space regions, and determining a position of the rotor based on the generated measured values of the magnetic fields. The planar drive system includes at least a controller, a stator module, and a rotor.

A core includes a laminated body. The laminated body includes a plurality of electrical steel sheets stacked one on another. The laminated body includes a contact area between a pair of adjacent electrical steel sheets of the plurality of electrical steel sheets. The contact area includes a first friction area and a second friction area with friction coefficients different from each other.

A magnetic field apparatus includes a main magnet that generates a magnetic field with respect to an armature, a member made of a soft magnetic material and disposed adjacent to an end surface of the main magnet on a side opposing the armature, an auxiliary magnet that increases a magnetic flux of a magnetic pole of the main magnet on the side opposing the armature and disposed adjacent to the main magnet and the member in a relative moving direction between the magnetic field apparatus and the armature, and a restricting part that restricts the magnetic flux of the main magnet passing through an end surface of the member along a third direction that is perpendicular to both a first direction in which the main magnet and the armature oppose each other, and a second direction corresponding to the relative moving direction between the magnetic field apparatus and the armature.

A magnetic field apparatus includes a main magnet that generates a magnetic field with respect to an armature, a member made of a soft magnetic material and disposed adjacent to an end surface of the main magnet on a side opposing the armature, an auxiliary magnet that increases a magnetic flux of a magnetic pole of the main magnet on the side opposing the armature and disposed adjacent to the main magnet and the member in a relative moving direction between the magnetic field apparatus and the armature, and a restricting part that restricts the magnetic flux of the main magnet passing through an end surface of the member along a third direction that is perpendicular to both a first direction in which the main magnet and the armature oppose each other, and a second direction corresponding to the relative moving direction between the magnetic field apparatus and the armature.

A linear compressor includes a casing, a cylinder forming a compression chamber inside the casing, a piston reciprocating to compress a fluid of the compression chamber, a mover having a movable magnet and reciprocating on the basis of a predetermined reference position to drive the piston, and a stator generating a thrust pushing the mover in the reciprocating direction and a restoring force pushing the mover in a direction toward the reference position according to an interaction with the movable magnet, wherein the stator includes a mover air gap formed to accommodate the mover and a magnetoresistive air gap formed in a position spaced apart from the mover air gap to change magnetic resistance of a magnetic circuit formed along the stator. According to this, a magnetic resonance spring with increased restoring force may be implemented.

A method to make a stator lamination of an axial flux motor for an automobile vehicle includes: constructing a stator having multiple stator stack members, including: providing a stator lamination with individual ones of the stator stack members; forming the stator lamination from a single lamination sheet of steel defining a sinuous-shaped assembly having multiple bends; compressing the stator lamination; and machining the stator lamination to create a first edge by removing a first portion of the multiple bends and to create a second edge opposite to the first edge by removing a second portion of the multiple bends.

A method to make a stator lamination of an axial flux motor for an automobile vehicle includes: constructing a stator having multiple stator stack members, including: providing a stator lamination with individual ones of the stator stack members; forming the stator lamination from a single lamination sheet of steel defining a sinuous-shaped assembly having multiple bends; compressing the stator lamination; and machining the stator lamination to create a first edge by removing a first portion of the multiple bends and to create a second edge opposite to the first edge by removing a second portion of the multiple bends.

A stator includes: a stator core including a plurality of stator teeth in a circumferential direction with respect to a center of rotation of a rotary electric machine; a stator coil disposed on a bottom portion side of each of a plurality of stator slots formed between the stator teeth; and a stator magnet disposed on an opening side of each of the plurality of stator slots and having the same polarity in a radial direction. In each of the stator slots, a plate-shaped fixing member is provided between the stator coil and the stator magnet so as to be fitted to opposed two wall surfaces of the stator slot, and a magnetic body is provided between the stator coil and the stator magnet.

The present disclosure relates to electrical machines and methods for cooling active elements of electrical machines. More in particular, the present disclosure relates to rotors of electrical machines. An electrical machine may for example be a generator for a direct drive wind turbine. An electrical machine comprises a rotor comprising a plurality of active rotor elements, a stator comprising a plurality of active stator elements, and an air gap separating the active rotor elements and the active stator elements. The rotor further comprises one or more rotor openings configured for letting air flow enter the electrical machine and cool the active rotor elements and/or active stator elements in response to a rotation of the rotor.

The present disclosure relates to electrical machines and methods for cooling active elements of electrical machines. More in particular, the present disclosure relates to rotors of electrical machines. An electrical machine may for example be a generator for a direct drive wind turbine. An electrical machine comprises a rotor comprising a plurality of active rotor elements, a stator comprising a plurality of active stator elements, and an air gap separating the active rotor elements and the active stator elements. The rotor further comprises one or more rotor openings configured for letting air flow enter the electrical machine and cool the active rotor elements and/or active stator elements in response to a rotation of the rotor.