An electrical sheet includes an electrical sheet main body produced by additive manufacturing (a 3D screen printing method) from at least a first and a second material. The first and second materials have magnetic properties which differ from one another, and first and second domains are formed in the electrical sheet main body from the first and second materials respectively. An electric machine is also provided. An electric machine and a method for producing an electrical sheet for use in a stator or rotor of an electric machine are also provided.

A hysteresis clutch including a first rotor with magnets that are polarized in opposite directions in pairs in a circumferential direction and between which pole pieces are provided for deflecting the magnetic flux in the radial direction and a second rotor of the hysteresis clutch has a series of second permanent magnets that extend in the circumferential direction and which are arranged on a circle that is concentric to the rotational axis A, the number of the first magnets and the number of the second magnet are configured such that a smooth torque curve is achieved which is free of a detent torque or at least has a low detent torque.

A hysteresis clutch including a first rotor with magnets that are polarized in opposite directions in pairs in a circumferential direction and between which pole pieces are provided for deflecting the magnetic flux in the radial direction and a second rotor of the hysteresis clutch has a series of second permanent magnets that extend in the circumferential direction and which are arranged on a circle that is concentric to the rotational axis A, the number of the first magnets and the number of the second magnet are configured such that a smooth torque curve is achieved which is free of a detent torque or at least has a low detent torque.

A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of B.sub.2O.sub.3, a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]≤0.79 and [Co]/[Zn]≤0.67 when an atomic concentration of La is represented by [La], an atomic concentration of Co is represented by [Co], and an atomic concentration of Zn is represented by [Zn].

A ferrite sintered magnet comprising an M type Sr ferrite having a hexagonal structure as a main phase, wherein the ferrite sintered magnet comprises La and Co, a content of B is 0.005 to 0.9% by mass in terms of B.sub.2O.sub.3, a content of Zn is 0.01 to 1.2% by mass in terms of ZnO, and the ferrite sintered magnet satisfies [La]/[Zn]≤0.79 and [Co]/[Zn]≤0.67 when an atomic concentration of La is represented by [La], an atomic concentration of Co is represented by [Co], and an atomic concentration of Zn is represented by [Zn].

An EC motor with a stator and a rotor mounted to a shaft. The motor has a cooling system, an over molded stator housing, and an optimized rotor. The stator has teeth with wound electromagnetic coils. The teeth and coils are distributed circumferentially with gaps between adjacent coils. The stator is over molded with plastic that forms axially oriented cooling passages between adjacent coil sections. An impeller fan then draws air into the motor through air inlets connected to air passages. The impeller fan directs the air through the axially oriented cooling passages in the stator and out air outlets. An optimized internal rotor has permanent magnets and silicon steel laminates spaced circumferentially and extending outwardly from a central hub. Rectangular shaped magnets are interposed in the gaps between the laminates. Wedge-shaped magnets are aligned radially with the laminates and between the laminates and the hub.

A vibration actuator includes a bracket coupled to a case to form an inner space; a stator having a circuit board coupled to an upper surface of the bracket, a coil connected to the circuit board, and a yoke provided in the coil; a vibrator having a permanent magnet disposed at an outer side of the coil and a weight coupled to an outer circumference of the permanent magnet; an elastic member configured to connect the stator and the vibrator and elastically support the vibrator; and a non-magnetic damper provided between the weight and the elastic member.

A vibration actuator includes a bracket coupled to a case to form an inner space; a stator having a circuit board coupled to an upper surface of the bracket, a coil connected to the circuit board, and a yoke provided in the coil; a vibrator having a permanent magnet disposed at an outer side of the coil and a weight coupled to an outer circumference of the permanent magnet; an elastic member configured to connect the stator and the vibrator and elastically support the vibrator; and a non-magnetic damper provided between the weight and the elastic member.

An electric motor apparatus is described that utilizes a Halbach array and a ferrofluid core. The electric motor comprises a rotor assembly and a stator assembly, each of which utilizes a Halbach array. A ferrofluid core is utilized in the stator, which results in a motor that is less susceptible to core loss and operates with increased efficiency.

An electric motor apparatus is described that utilizes a Halbach array and a ferrofluid core. The electric motor comprises a rotor assembly and a stator assembly, each of which utilizes a Halbach array. A ferrofluid core is utilized in the stator, which results in a motor that is less susceptible to core loss and operates with increased efficiency.