Hybrid-electric vehicle having a matched reactance machine

• US 20050179264A1
• Filed: 09/24/2004
• Published: 08/18/2005
• Est. Priority Date: 02/18/2004
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Ganev, Evgeni
• Granted Patent: US 7,148,649 B2
• Time in Patent Office: Days
• US Class Current: 290/40.C
• CPC Class Codes: H02J 3/241 The oscillation concerning frequency
• CPC Class Codes: H02P 9/48 Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle H02P9/04 - H02P9/46 take precedence

Abstract

A hybrid-electric vehicle including a matched reactance machine power generation system (MRMPGS). The MRMPGS comprises a permanent magnet rotor type machine having a selected back electromotive force (BEMF) voltage value and a selected machine inductance value. The BEMF voltage value is selected having a line-to-line peak voltage that is equal to a desired terminal voltage of the machine at a first machine speed. The machine inductance value is selected based upon a machine reactance value and a frequency value, which correspond to a proportional increase in the selected BEMF voltage value between the first machine speed and a second machine speed.

Claims

1. A hybrid-electric vehicle (HEV) comprising a matched reactance machine power generation system (MRMPGS) wherein:

the MRMPGS comprises a permanent magnet rotor type machine having a selected back electromotive force (BEMF) voltage value and a selected machine inductance value;

the BEMF voltage value is selected having a line-to-line peak voltage that is equal to a desired terminal voltage of the machine at a first machine speed; and

the machine inductance value is selected based upon a machine reactance value and a frequency value which correspond to a proportional increase in the selected BEMF voltage value between the first machine speed and a second machine speed.

2. The HEV of claim 1 further comprising a three phase permanent magnet (PM) generator.

3. The HEV of claim 2 wherein each phase of the PM generator is coupled to a simple bridge rectifier, and the bridge rectifier is coupled to a common DC bus.

4. The HEV of claim 3 wherein the HEV comprises a power storage unit coupled to the DC bus in parallel with the bridge rectifier, and in parallel with a propulsion load.

5. The HEV of claim 4 wherein the power storage unit is a battery.

6. The HEV of claim 4 comprising a turbine engine coupled to the MRMPGS.

7. The HEV of claim 1, wherein the BEMF voltage value is selected at said first speed where said BEMF voltage value and the terminal voltage have a substantially equal amplitude and an electrical phase difference of approximately zero.

8. The HEV of claim 1, wherein the first machine speed corresponds to a substantially zero delivered power.

9. The HEV of claim 1, wherein the second machine speed corresponds to a substantially maximum delivered power.

10. The HEV of claim 1, wherein the machine reactance value is selected at the second speed from a vector diagram calculation for reactance including a machine terminal voltage vector and an internal machine voltage drop vector.

11. The HEV of claim 10, wherein the machine terminal voltage vector and the internal machine voltage drop vector are perpendicular.

12. The HEV of claim 1, wherein the machine speed is controlled to provide a substantially constant terminal voltage for a variable demand level.

13. The HEV of claim 1, wherein the excitation of the machine is fixed and achieved by at least one permanent magnet embedded in a rotor assembly.

14. The HEV of claim 1, wherein:

the MRMPGS comprises a three phase permanent magnet (PM) generator, each phase of the PM generator being coupled to a simple bridge rectifier, and the bridge rectifier is coupled to a common DC bus;

a battery coupled to the DC bus in parallel with the bridge rectifier, and in parallel with a propulsion load; and

a turbine engine coupled to the MRMPGS.

15. The HEV of claim 14, wherein:

the BEMF voltage value is selected at said first speed where said BEMF voltage value and the terminal voltage have a substantially equal amplitude and an electrical phase difference of approximately zero;

the first machine speed corresponds to a substantially zero delivered power;

the second machine speed corresponds to a substantially maximum delivered power;

the machine reactance value is selected at the second speed from a vector diagram calculation for reactance including a machine terminal voltage vector and an internal machine voltage drop vector;

the machine terminal voltage vector and the internal machine voltage drop vector are perpendicular; and

the machine speed is controlled to provide a substantially constant terminal voltage for a variable demand level.

16. A method for providing substantially constant-voltage power for an electric distribution system of a hybrid-electric vehicle (HEV) using a matched reactance machine power generation system (MRMPGS), the method comprising the steps of:

providing a permanent magnet rotor type machine having a selected back electromotive force (BEMF) voltage value and a selected machine inductance value, wherein an excitation of the machine is fixed and achieved by at least one permanent magnet embedded in a rotor assembly of the machine;

selecting the BEMF voltage value for the machine, wherein the BEMF voltage value is selected having a line-to-line peak voltage that is equal to a desired terminal voltage of the machine at a first machine speed;

selecting the machine inductance, value for the machine, wherein the machine inductance value is selected based upon a machine reactance value and a frequency value which correspond to a proportional increase in the selected BEMF voltage value between the first machine speed and a second machine speed; and

controlling the machine speed to provide a substantially constant terminal voltage for a variable demand level.

17. The method of claim 16, further comprising the step of:

selecting the BEMF voltage value at the first speed wherein the BEMF voltage value and the terminal voltage have a substantially equal amplitude and an electrical phase difference of approximately zero.

18. The method of claim 17, further comprising the step of:

selecting the machine reactance value at the second speed from a vector diagram calculation for reactance including a machine terminal voltage vector and an internal machine voltage drop vector.

19. A method of providing power to a propulsion load of a hybrid-electric vehicle (HEV) comprising:

providing a turbine engine driven permanent magnet generator, a battery, a simple three phase rectifier and a propulsion load;

coupling the generator to the simple three phase rectifier, and coupling the combination of generator and rectifier in parallel with the battery and the propulsion load;

using the generator and battery to provide power to the propulsion load, and the battery to store power produced by the propulsion load.

20. The method of claim 19 wherein:

permanent magnet generator has a selected back electromotive force (BEMF) voltage value and a selected machine inductance value;

the BEMF voltage value is selected having a line-to-line peak voltage that is equal to a desired terminal voltage of the machine at a first machine speed; and

the machine inductance value is selected based upon a machine reactance value and a frequency value which correspond to a proportional increase in the selected BEMF voltage value between the first machine speed and a second machine speed.