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US 2020/0403536 A1Published application
Motor driving device for reducing load on rotating shaft
AssigneeLG Electronics Inc.
InventorMin Gi KIM
Life of this patent
Estimating the term…
Abstract
The present invention relates to a motor driving device which can reduce a load burden on a rotating shaft when a magnetic bearing is initially operated. When a rotor and a stator are initially aligned, the motor driving device can apply a greater current to a coil positioned farthest away from the ground among a plurality of coils than to the other coils, so as to reduce a levitation force necessary for initial alignment of the rotor and the stator.
Claims20
A motor driving device comprising:
- a housing;
- a stator that is located on an inner surface of the housing and that includes a plurality of teeth on which a plurality of coils are wound respectively;
- a rotor located in the stator and configured to rotate based on a magnetic field generated by the plurality of coils;
- a rotating shaft that extends in an axial direction of the rotor and that is horizontally oriented relative to a support surface of the housing;
- magnetic bearings configured to generate magnetic force that levitates the rotating shaft upward;
- and
- a controller configured to apply currents to the plurality of coils and control operation of the magnetic bearings,
- wherein the currents applied by the controller to the plurality of coils have different magnitudes,
- wherein the plurality of teeth include a first tooth located above the rotating shaft, and
- wherein a winding center axis of a first coil wound on the first tooth forms a smallest angle with a line parallel to a gravitational direction among angles formed by winding center axes of the plurality of coils and the plurality of teeth respectively.
7 more elements
A method to control a motor driving device, comprising:
- winding a plurality of coils respectively on a plurality of teeth that included in a stator;
- rotating, based on a magnetic field generated by the plurality of coils, a rotor located in the stator;
- extending a rotating shaft in an axial direction of the rotor the rotating shaft being horizontally oriented relative to a support surface of the housing;
- and
- generating, by magnetic bearings magnetic force that levitates the rotating shaft upward,
- wherein a largest current is applied to a coil, based on a motor being initially driven, to form a smallest angle with a line oriented parallel to a gravitational direction among angles formed by winding center axes of the plurality of coils and the plurality of teeth respectively, to levitate the rotating shaft.
3 more elements
A motor driving device comprising:
- a housing;
- a stator that is located on an inner surface of the housing and that includes a plurality of teeth on which a plurality of coils are wound respectively;
- a rotor located in the stator and configured to rotate based on a magnetic field generated by the plurality of coils;
- a rotating shaft that extends in an axial direction of the rotor;
- magnetic bearings configured to generate a magnetic force that levitates the rotating shaft upward;
- and
- a controller configured to apply currents to the plurality of coils and control operation of the magnetic bearings,
- wherein the controller is configured to apply a largest current to a coil, among the plurality of coils, that is located farthest away from ground on which the housing rests.
5 more elements
Dependencies are inferred from the claim text.