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US 10,946,748 B2Granted
High power-density, high back EMF permanent magnet machine and method of making same
AssigneeGeneral Electric Company
InventorsAyman Mohamed Fawzi EL-Refaie, Robert Dean King
Life of this patent
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Abstract
An electric drive system includes a permanent magnet machine having a rotor and a stator and a power converter electrically coupled to the permanent magnet machine and configured to convert a DC link voltage to an AC output voltage to drive the permanent magnet machine. The power converter includes a plurality of silicon carbide switching devices having a voltage rating that exceeds a peak line-to-line back electromotive force of the permanent magnet machine at a maximum speed of the permanent magnet machine.
Claims21
An electric drive system comprising:
- an electric machine comprising a rotor and a stator;
- a power converter electrically coupled to the electric machine and configured to convert a DC link voltage to an AC output voltage to drive the electric machine, the power converter comprising:
- a plurality of silicon carbide (SiC) switching devices, wherein a three-terminal controlled device of each switching device has voltage rating that exceeds a peak line-to-line back electromotive force (emf) of the electric machine during an uncontrollable generation mode of the electric machine when a control gate signal on each of the switching devices is turned off;
- a power source coupleable to the power converter, the power source comprising a DC power source coupled to a bi-directional DC-DC converter;
- and
- at least one contactor coupled between the power converter and the bi-directional DC-DC converter, the contactor configured to decouple the power source and bi-directional DC-DC converter from the power converter during the uncontrollable generation mode.
3 more elements
A vehicle drive system comprising:
- an electric machine comprising:
- a rotor;
- and
- a stator;
- a DC link;
- a power converter electrically coupled between the DC link and the electric motor to drive the electric motor;
- a power source coupleable to the power converter, the power source comprising a DC power source coupled to a bi-directional DC-DC converter;
- and
- at least one contactor coupled between the power converter and the bi-directional DC-DC converter;
- wherein the power converter comprises a plurality of silicon carbide (SiC) three-terminal controlled switching devices, wherein a three-terminal controlled device of each switching device has a voltage rating that exceeds a peak line-to-line back electromotive force (emf) of the motor based on a fault condition when the line-to-line back emf is within a threshold percentage of a voltage rating of the DC power source;
- wherein the contactor is configured to decouple the power source and bi-directional DC-DC converter from the power converter during the fault condition.
8 more elements
An electric drive system comprising:
- an electric machine comprising a rotor and a stator;
- and
- a power converter electrically coupled to the electric machine and configured to convert a DC link voltage to an AC output voltage to drive the electric machine, the power converter comprising:
- a plurality of silicon carbide (SiC) switching devices, wherein a three-terminal controlled device of each switching device has a voltage rating that exceeds a peak line-to-line back electromotive force (emf) of the electric machine during an uncontrollable generation mode;
- a power source coupleable to the power converter, the power source comprising a DC power source coupled to a DC-DC converter;
- and
- at least one switching device coupled between the power converter and the DC-DC converter, the switching device configured to decouple the power source and DC-DC converter from the power converter during the uncontrollable generation mode in response to a control signal.
4 more elements
Dependencies are inferred from the claim text.