An electric motor includes a first printed circuit board having layers with conductor tracks. The layers are spaced apart from one another by first layers of insulating material, for example, fiber-reinforced plastic, e.g., an epoxy material, and an insulating layer is arranged between two of the layers.

An electric motor includes a first printed circuit board having layers with conductor tracks. The layers are spaced apart from one another by first layers of insulating material, for example, fiber-reinforced plastic, e.g., an epoxy material, and an insulating layer is arranged between two of the layers.

An electric motor assembly comprising a rotor, a stator, first and second electromagnetic winding in first and second separate slot sets of a plurality of stator slots operatively configured to be selectively energized to exert a torque on the rotor, the first windings comprising first and second coils in first and second pairs of slots in the first slot set, the first coil comprising a first number of turns and the second coil comprising a second number of turns that is greater than the first number of turns, the second windings comprising third and fourth coils in third and fourth pairs of slots in the second slot set, the third coil comprising a third number of turns and the fourth coil comprising a fourth number of turns that is greater than the third number of turns.

A double-stator PM machine having: an outer stator generating an outer electromagnetic field dependent on an outer three-phase supply current; an inner stator generating an inner electromagnetic field dependent on an inner three-phase supply current; a PM rotor rotated by the outer and inner electromagnetic fields between the outer and inner stators; and a control arrangement controlling the outer and inner supply currents. There is an electrical connection between neutral points of the outer and inner stators. The control arrangement is configured for controlling the outer and inner supply currents such that there is a relative angle shift of 30° between the outer and inner supply currents and such that a third order current harmonic component is circulated between the outer and inner stators.

A double-stator PM machine having: an outer stator generating an outer electromagnetic field dependent on an outer three-phase supply current; an inner stator generating an inner electromagnetic field dependent on an inner three-phase supply current; a PM rotor rotated by the outer and inner electromagnetic fields between the outer and inner stators; and a control arrangement controlling the outer and inner supply currents. There is an electrical connection between neutral points of the outer and inner stators. The control arrangement is configured for controlling the outer and inner supply currents such that there is a relative angle shift of 30° between the outer and inner supply currents and such that a third order current harmonic component is circulated between the outer and inner stators.

A compressor has: a motor that has a stator provided around an axis of a rotor; a rotating shaft that is fixed to the rotor; a bearing that supports the rotating shaft; an impeller that is connected to the rotating shaft and compresses fluid; and a casing that accommodates the motor. In this compressor, the stator has: a coil that encircles the axis of the rotor; and a stator core that has a magnetic pole facing, in a radial direction of the rotor, an outer circumferential surface of the rotor, via a gap.

In some embodiments, two or more different types of stator structures may be disposed within a gap of an axial flux machine. Such arrangements may be advantageous, for example, for producing a machine optimized for multiple modes of operation, such as mechanical torque generation, conversion of mechanical torque to electrical power, and/or dissipation of mechanical power. Further, in some embodiments, an axial flux machine may include a planar stator having a winding arranged to be positioned within the machine's active region, and may further include at least one switch configured to be selectively closed to establish an electrical connection between respective ends of the winding at a time that the winding is not coupled to an external power source

An axial-flux and radial-flux motor including a rotor mounted rotatably about a machine axis, with the rotor rotatively attached to a shaft. A stator assembly having a core with a non-ferromagnetic material and including a first axial-flux stator yoke with an inner wall rigidly attached on an outer surface of a first edge wall of the core. A second axial-flux stator yoke having an inner wall rigidly attached on an outer surface of a second edge wall of the core. The first and the second axial-flux stator yokes each include an outer wall with slots. A radial-flux stator yoke with slots includes an inner wall rigidly attached on a continuous outer wall of the core. The radial-flux stator yoke and the first and the second axial-flux stator yokes include laminated sheets. Windings positioned in the slots of the first and the second axial-flux stator yokes and the radial-flux stator yoke.

An axial-flux and radial-flux motor including a rotor mounted rotatably about a machine axis, with the rotor rotatively attached to a shaft. A stator assembly having a core with a non-ferromagnetic material and including a first axial-flux stator yoke with an inner wall rigidly attached on an outer surface of a first edge wall of the core. A second axial-flux stator yoke having an inner wall rigidly attached on an outer surface of a second edge wall of the core. The first and the second axial-flux stator yokes each include an outer wall with slots. A radial-flux stator yoke with slots includes an inner wall rigidly attached on a continuous outer wall of the core. The radial-flux stator yoke and the first and the second axial-flux stator yokes include laminated sheets. Windings positioned in the slots of the first and the second axial-flux stator yokes and the radial-flux stator yoke.

An electric motor includes a rotor and a stator. The stator includes a first stator core located on a first side in the axial direction, and a second stator core located on a second side. The minimum distance from a rotor core of the rotor to the first stator core in the radial direction is smaller than the minimum distance from the rotor core to the second stator core in the radial direction. Each tooth of the first stator core includes a tooth end portion. The tooth end portion includes a main body extending in the radial direction, and a first portion extending in the circumferential direction, and a second portion projecting from the first portion in the radial direction.