An electric motor for high speed operation use and a rotor which enables use of common parts with electric motors for low speed operation use and which thereby enables reduction of the manufacturing costs. The rotor is provided with a shaft, a rotor core which is fastened to the shaft at the outside in the radial direction and has a first end face at one end in the axial direction and a second end face at the other end in the axial direction, a plurality of conductors which are arranged at the rotor core, and a pair of end rings which are respectively arranged adjoining the first end face and the second end face and which short-circuit the plurality of conductors with each other. The shaft has an outer circumference, while the end rings have outer circumferences which are arranged concentrically with respect to the outer circumference of the shaft.

A lamination pack for producing stators and/or rotors of electric motors and generators has laminations, stacked and fixedly connected to each other, between which electrically insulating layers are provided. The laminations are connected to each other outside of the electrically insulating layers by an electrically conducting connection.

To provide a rotating electrical machine which can be easily configured at low lost, and which can highly accurately maintain an axial position (position in a thrust direction) of a rotating shaft in a prearranged position, and a machine tool, to which the rotating electrical machine is applied. A rotating electrical machine includes: a stator including a stator core; and a rotor supported on a rotating shaft supported by way of a non-contact bearing. When a section, in which a torque generation member exists in an axial direction of the rotating electrical machine, is defined as a torque generation section, a first end and a second end of the stator core in the axial direction extend outwards in the axial direction from a first end and a second end of the torque generation section at the rotor side in the axial direction. According to one aspect of the present invention, a length of the first end and the second end of the stator core extending outwards in the axial direction, from the first end and the second end of the torque generation section at the rotor side in the axial direction, is longer than a magnetic gap length of the rotating electrical machine.

To provide a rotating electrical machine which can be easily configured at low lost, and which can highly accurately maintain an axial position (position in a thrust direction) of a rotating shaft in a prearranged position, and a machine tool, to which the rotating electrical machine is applied. A rotating electrical machine includes: a stator including a stator core; and a rotor supported on a rotating shaft supported by way of a non-contact bearing. When a section, in which a torque generation member exists in an axial direction of the rotating electrical machine, is defined as a torque generation section, a first end and a second end of the stator core in the axial direction extend outwards in the axial direction from a first end and a second end of the torque generation section at the rotor side in the axial direction. According to one aspect of the present invention, a length of the first end and the second end of the stator core extending outwards in the axial direction, from the first end and the second end of the torque generation section at the rotor side in the axial direction, is longer than a magnetic gap length of the rotating electrical machine.

In the rotor core, three or more magnet housing holes for housing magnets are formed in the circumferential direction, and when it is assumed that a stack thickness of the rotor core is X, a stack thickness of the stator core is Y, a sectional area of a core portion surrounded by a line connecting midpoints of an inner diameter side surface of each of the magnet housing holes is S3, a sectional area of an outer-peripheral-side core portion provided between an outer diameter side surface of each of the magnet housing holes and an outer periphery of the rotor core is S2, a sectional area obtained by subtracting the sectional area S2 and the sectional area S3 from a sectional area of the rotor core is S1, the rotor stack thickness is formed so as to satisfy the relation of X>Y and X<Y(1+(S2/S1)×2).

In the rotor core, three or more magnet housing holes for housing magnets are formed in the circumferential direction, and when it is assumed that a stack thickness of the rotor core is X, a stack thickness of the stator core is Y, a sectional area of a core portion surrounded by a line connecting midpoints of an inner diameter side surface of each of the magnet housing holes is S3, a sectional area of an outer-peripheral-side core portion provided between an outer diameter side surface of each of the magnet housing holes and an outer periphery of the rotor core is S2, a sectional area obtained by subtracting the sectional area S2 and the sectional area S3 from a sectional area of the rotor core is S1, the rotor stack thickness is formed so as to satisfy the relation of X>Y and X<Y(1+(S2/S1)×2).

An electric motor has a first carrier having an array of electromagnetic elements and a second carrier having electromagnetic elements defining magnetic poles. The first and second carriers each define an axis. An airgap is formed between the first and second carriers when in an operational position. An inner thrust bearing connects the first and second carriers and is arranged to allow relative rotary motion of the carriers. An outer thrust bearing connects the first and second carriers and is arranged to allow relative rotary motion of the carriers. The electromagnetic elements of each of the first and second carriers are arranged radially inward of the outer thrust bearing and radially outward of the inner thrust bearing. The inner thrust bearing and the outer thrust bearing are arranged to maintain the airgap against a magnetic attraction of the electromagnetic elements of the first and second carriers.

Pairs of unidirectionally magnetic rotor/stator assemblies are mounted for synchronous rotation and complementary, so that one creates pulsating positive current flow and the other creates pulsating negative current flow, as the rotor and stator in each assembly are rotated with respect to each other. The pulsating positive current flow and pulsating negative current flow are combined at a desired phase angle to create alternating current, without power loss due to reversal of current flow.

It comprises a rotor and a stator that they both may be formed of a single piece or they may be formed of a number of sectors. The generator further comprises at least one active module unit as an independent unit from both the rotor and the stator. The active module unit includes at least one permanent magnet, a magnet support structure attached thereto, a first attaching mechanism to removably attach the magnet support structure to the rotor or the stator, at least one coil module comprising at least one coil winding and a magnetic core, and a second attaching mechanism to removably attach the coil module to the other of the rotor or the stator. The coil module is spaced apart from the permanent magnet a predetermined distance.

It comprises a rotor and a stator that they both may be formed of a single piece or they may be formed of a number of sectors. The generator further comprises at least one active module unit as an independent unit from both the rotor and the stator. The active module unit includes at least one permanent magnet, a magnet support structure attached thereto, a first attaching mechanism to removably attach the magnet support structure to the rotor or the stator, at least one coil module comprising at least one coil winding and a magnetic core, and a second attaching mechanism to removably attach the coil module to the other of the rotor or the stator. The coil module is spaced apart from the permanent magnet a predetermined distance.