A rotor for a permanent magnet motor, including a rotor body having a cylindrical surface having a circumference. A plurality of magnets are disposed on the cylindrical surface at spaced intervals at the circumference, each of the magnets having a base disposed on the cylindrical surface and a top oriented radially away from the base, a sloping front side and a sloping rear side defining with the base and top an isosceles trapezoid shape in a cross sectional plane normal to an axis of rotation of the rotor, the isosceles trapezoid shape being broader at the base. A plurality of magnet retainers, each magnet retainer disposed between a neighboring pair of the plurality of magnets, include angled faces that engage respective front and rear sides of adjacent pairs of the plurality of magnets.

A rotor for a permanent magnet motor, including a rotor body having a cylindrical surface having a circumference. A plurality of magnets are disposed on the cylindrical surface at spaced intervals at the circumference, each of the magnets having a base disposed on the cylindrical surface and a top oriented radially away from the base, a sloping front side and a sloping rear side defining with the base and top an isosceles trapezoid shape in a cross sectional plane normal to an axis of rotation of the rotor, the isosceles trapezoid shape being broader at the base. A plurality of magnet retainers, each magnet retainer disposed between a neighboring pair of the plurality of magnets, include angled faces that engage respective front and rear sides of adjacent pairs of the plurality of magnets.

A reduction gearbox which has: an input, which can be coupled to an input shaft, which has an input speed; an output, which rotates at an output speed that is lower than the input speed; and at least one statically arranged component. It is envisaged that an electric generator is integrated into the reduction gearbox, said generator comprising a rotor and a stator, wherein the rotor of the electric generator is coupled to the output of the reduction gearbox, and the stator of the electric generator is coupled to a statically arranged component of the reduction gearbox.

Methods and systems for cooling an electric motor are provided. An electric motor cooling system, in one example, includes a stator at least partially surrounding a rotor and an inner passage extending axially through the rotor and including an inlet and an outlet. The cooling system further includes an outer passage including an inlet in fluidic communication with the outlet of the inner passage and an outlet in fluidic communication with an inlet of the inner passage and a phase change material in the inner passage and the outer passage.

A method for magnetizing a soft magnet in a rotor of a variable-flux memory motor (VFMM) includes: generating a first pulse of electric current that has a duration of equal to or more than 0.1 millisecond (ms) and equal to or less than 2 ms; and applying the first pulse to a stator winding of the VFMM to set a magnetization state of the soft magnet to a first magnetization state.

A motor including a first part having an outer peripheral portion and a second part having an inner peripheral portion facing the outer peripheral portion, the first part and the second part being configured to rotate relative to each other, includes a plurality of coils on one of the outer peripheral portion and the inner peripheral portion, and a plurality of magnets on the other of the outer peripheral portion and the inner peripheral portion at positions facing the plurality of coils, wherein the plurality of magnets includes a first magnet portion configured to apply a thrust to at least one of the plurality of coils in a rotation direction and a second magnet portion configured to apply a thrust to at least one of the plurality of coils in a direction intersecting the rotation direction, when an electric current is applied to the plurality of coils.

The present invention relates to electric submersible pumps that have two or more permanent magnet motors and more specifically to such systems wherein permanent magnet motors are aligned using phase and pole alignment marks.

The present invention relates to electric submersible pumps that have two or more permanent magnet motors and more specifically to such systems wherein permanent magnet motors are aligned using phase and pole alignment marks.

An electric motor for reciprocating an object along a rod having a predetermined length is provided, comprising: a housing; a rotor unit that is mounted to the inside of the housing via a bearing to be rotatable and comprises a rotor shaft, which is axially-coupled to the rod to linearly reciprocate along the rod during rotation, and a plurality of magnets mounted along the circumference direction of the rotor shaft; and a stator unit comprising at least one stator core and a coil, the at least one stator core comprising a yoke portion of a closed loop shape that is built in the housing so as to surround the circumference of the rotor unit, and a plurality of slot portions extending from the yoke portion toward the rotor, and the coil being wound around at least one slot portion among the plurality of slot portions.

The invention is a drive system comprising an inverter comprising N arms, each arm including an upper half-arm and a lower half-arm each comprising at least one switching module, a rotary machine connected to the inverter, including a rotor having at least one magnetic element made from a modular magnetization material and a control device which, during magnetization controls the inverter to simultaneously for each one of m arms, set each switching module of the upper half-arm and turned on and each switching module of the lower half-arm is turned off, for each one of k other arms, set each switching module of the upper half-arm to be off and each switching module of the lower half arm to be on, and for each of the remaining arms, set each switching module to be off.