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US 12,040,685 B2Granted
Electric motor with passive and active magnetic bearings
AssigneeVeritium Research LLC
InventorsGino Morello, Steven Prina
Life of this patent
Estimating the term…
Abstract
A magnetically levitated motor includes a stator, a rotor configured to rotate relative to the stator, and a passive radial magnetic bearing configured to support the rotor relative to the stator in a radial direction. An active longitudinal magnetic bearing is configured to selectively position the rotor relative to the stator in an axial direction.
Claims20
A device, comprising:
- a stator;
- a rotor configured to rotate relative to the stator;
- a passive radial magnetic bearing configured to support the rotor relative to the stator in a radial direction, the passive radial magnetic bearing comprising:
- a passive magnetic bearing (PMB) stator including a first PMB stator magnet and a second PMB stator magnet attached to the stator and arranged in a bucking configuration, with a non-magnet spacer situated between the first PMB stator magnet and the second PMB stator magnet, PMB stator magnet are permanent magnets;
- and
- a PMB rotor including a first PMB rotor magnet and a second PMB rotor magnet attached to the rotor and arranged in a bucking configuration, wherein the PMB rotor magnet and the second PMB rotor magnet are permanent magnets;
- and
- an active longitudinal magnetic bearing configured to selectively position the rotor relative to the stator in an axial direction.
5 more elements
A device, comprising:
- a stator;
- a rotor configured to rotate relative to the stator;
- a passive radial magnetic bearing configured to support the rotor relative to the stator in a radial direction, the passive radial magnetic bearing comprising:
- a passive magnetic bearing (PMB) stator including a first PMB stator magnet and a second PMB stator magnet attached to the stator and arranged in a bucking configuration, with a non-magnet spacer situated between the first PMB stator magnet and the second PMB stator magnet;
- and
- a PMB rotor including a first PMB rotor magnet and a second PMB rotor magnet attached to the rotor and arranged in a bucking configuration;
- and
- an active longitudinal magnetic bearing configured to selectively position the rotor relative to the stator in an axial direction, wherein the active longitudinal magnetic bearing comprises a voice coil magnetic actuator (VCA) comprising:
- a VCA rotor magnet connected to the rotor, the VCA rotor magnet including a first VCA rotor magnet and a second VCA rotor magnet arranged in a bucking configuration, a third VCA rotor magnet positioned between the first VCA rotor magnet and the second VCA rotor magnet, the third VCA rotor magnet including a plurality of 90 degree segments magnetized in a radial orientation;
- and
- a VCA winding extending around the VCA rotor magnet.
8 more elements
A device, comprising:
- a stator;
- a rotor configured to rotate relative to the stator;
- a passive radial magnetic bearing configured to support the rotor relative to the stator in a radial direction, the passive radial magnetic bearing comprising:
- a passive magnetic bearing (PMB) stator including a first PMB stator magnet and a second PMB stator magnet attached to the stator and arranged in a bucking configuration, with a non-magnet spacer situated between the first PMB stator magnet and the second PMB stator magnet;
- and
- a PMB rotor including a first PMB rotor magnet and a second PMB rotor magnet attached to the rotor and arranged in a bucking configuration;
- an active longitudinal magnetic bearing configured to selectively position the rotor relative to the stator in an axial direction;
- an actuator configured to selectively generate a rotating force to rotate the rotor relative to the stator,
- a position sensing magnet attached to the rotor;
- a motor controller including a Hall Effect Sensor array configured to determine a position of the rotor relative to the stator based on the position sensing magnet;
- a case having a first end and a second end, wherein the stator, the rotor, the passive radial magnetic bearing, the active longitudinal magnetic bearing, and the position sensing magnet are received in the case;
- an impeller attached to the rotor at the first end of the case;
- and
- a circuit board having the Hall Effect Sensor array mounted thereon, the circuit board mounted at the second end of the case adjacent the sensing magnet.
11 more elements
Dependencies are inferred from the claim text.