To simplify assembly and to reduce the susceptibility to faults of a linear drive comprising a transmission housing, an interference-suppressed electric motor which is connected thereto and is accommodated in a motor housing and which by way of a rotor accommodated in the motor housing drives a shaft which is mounted on a rear shaft end in a rear shaft bearing and is mounted on a front shaft end, a commutator for the transmission of current to the rotor, electrical and/or electronic components for interference suppression of the electric motor, it is proposed that the rear shaft bearing is mounted in the motor housing, the front shaft bearing is mounted in the transmission housing and the electrical and/or electronic components required for interference suppression of the electric motor are arranged on an interference suppression circuit board arranged between the front shaft bearing and the commutator.

A permanent-excited electric motor/induction machine has a laminated core (1) made of stator laminations (11) and a yoke winding (2). The yoke winding (2) has an inner winding part (21) and an outer winding port 22. The inner winding part 21 is arranged radially inside the stator lamination (11) in at least one winding receptacle (3). The outer winding part (22) is arranged radially outside the stator lamination (11) on an outer surface (4) of the laminated core (1). A soft-magnetic shield (5) is formed on the entire circumference around the outer winding part (22). At least one nonmagnetic connecting element (6), that contacts the stator lamination (11) and the soft-magnetic shield ring (5), is arranged between the stator lamination (11) and the soft-magnetic shield (5).

An angular displacement decoder and a method of construction of the device is described. The decoder includes a designated rotor, the rotating part, as a partially metallized disk-shaped target, and a designated stator set, comprising a planar primary coil, as the source of excitation, and a plurality of planar secondary sensing coils, connected and disposed in an innovative manner, as sensing elements, distributed by a plurality of layers of a multilayer printed circuit board (PCB).

In particular embodiments, the planar secondary/sensing coils are disposed as duets, as triplets, or as quartets, each one disposed in a different layer of the multilayer PCB, and the planar primary/excitation coil is disposed in a proper and determined layer of the multilayer PCB, and the partially metallized disk-shaped that rotates around its axis of revolution, is disposed with an air gap at determined distance from the stator set.

An angular displacement decoder and a method of construction of the device is described. The decoder includes a designated rotor, the rotating part, as a partially metallized disk-shaped target, and a designated stator set, comprising a planar primary coil, as the source of excitation, and a plurality of planar secondary sensing coils, connected and disposed in an innovative manner, as sensing elements, distributed by a plurality of layers of a multilayer printed circuit board (PCB).

In particular embodiments, the planar secondary/sensing coils are disposed as duets, as triplets, or as quartets, each one disposed in a different layer of the multilayer PCB, and the planar primary/excitation coil is disposed in a proper and determined layer of the multilayer PCB, and the partially metallized disk-shaped that rotates around its axis of revolution, is disposed with an air gap at determined distance from the stator set.

An active magnetic bearing apparatus for supporting a rotor of a rotary machine comprises an axial magnetic bearing unit and a radial magnetic bearing unit mounted directly to one another. One of the axial magnetic bearing unit and the radial magnetic bearing unit is mounted to a support for attachment to a housing of the rotary machine.

A magnetic field shielding structure includes a magnetic field generating source configured to generate a magnetic field. The magnetic field shielding structure further includes a shielding member that includes a pair of layers. The pair of layers includes a layer having high magnetic permeability, and a layer having low magnetic permeability laminated with the layer having high magnetic permeability. The layer having high magnetic permeability is closer to the magnetic field generating source than the layer having low magnetic permeability.

A magnetic field shielding structure includes a magnetic field generating source configured to generate a magnetic field. The magnetic field shielding structure further includes a shielding member that includes a pair of layers. The pair of layers includes a layer having high magnetic permeability, and a layer having low magnetic permeability laminated with the layer having high magnetic permeability. The layer having high magnetic permeability is closer to the magnetic field generating source than the layer having low magnetic permeability.

A motor stator anti-interference structure includes: a silicon steel sheet assembly, the silicon steel sheet assembly including multiple silicon steel sheets held between an insulation support assembly; a winding assembly wound on the silicon steel sheet assembly and the insulation support assembly; and a connection member inlaid in the silicon steel sheet assembly to contact all the silicon steel sheets. All the silicon steel sheets are connected to a grounding end of a circuit board through the connection member so as to increase contact area between the connection member and the silicon steel sheet assembly. The electromagnetic interference is conducted through the connection member to the grounding end of the circuit board.

A segmented secondary part of a linear motor includes at least two segments, each having a plurality of magnets attached to a yoke plate, having alternating polarity, and having a direction of magnetization perpendicular to the yoke plate. The yoke plates include an overlapping region, in which the yoke plates of adjacent segments are superposed in the direction of magnetization but do not touch each other in the overlapping region.

Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.