Electromagnetic motor

• US 7,034,499 B2
• Filed: 09/29/2004
• Issued: 04/25/2006
• Est. Priority Date: 10/03/2003
• Status: Expired due to Fees

• Current Assignee: UTC Power Corporation (Rtx Corporation)
• Original Assignee: RT Patent Company Incorporated
• Inventors: Sandberg, Kortney, Kerlin, John Harnsworth IV
• Primary Examiner(s): Masih, Karen
• Application Number:
  US10/952,663
• Publication Number:
  US 20050073281A1
• Time in Patent Office: 573 Days
• Field of Search: 310/68.A, 318/749, 318/751, 318/747, 318/752, 318/794, 318/254, 318/771, 318/245, 318/252, 318/716, 318/721, 318/732, 318/138, 318/439
• US Class Current: 318/749
• CPC Class Codes: H02K 11/00 Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection casings, enclosures or supports H02K5/00
• CPC Class Codes: H02K 19/12 characterised by the arrangement of exciting windings, e.g. for self-excitation, compounding or pole-changing
• CPC Class Codes: H02K 29/00 Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
• CPC Class Codes: H02K 99/20 Motors
• CPC Class Codes: H02P 2201/05 Capacitive half bridge, i.e. resonant inverter having two capacitors and two switches
• CPC Class Codes: H02P 25/16 characterised by the circuit arrangement or by the kind of wiring
• CPC Class Codes: H02P 6/00 Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor vector control H02P21/00
• CPC Class Codes: H02P 6/32 Arrangements for controlling wound field motors, e.g. motors with exciter coils

Abstract

An electromagnetic motor with increased torque. The motor has a rotor coil configured to generate a magnetic field. At least two stator coils are connected in series with the rotor coil. Each of the stator coils is configured to generate a respective magnetic field. The motor further includes a plurality of switches configured to generate the magnetic field in each of the respective rotor and stator coils. The switches are configured to generate the magnetic field in the stator coils such that the rotor coil rotates in response thereto. By having the rotor and stator coils connected in series, the torque of the motor is increased.

Claims

1. An electromagnetic motor, comprising:

a rotor;

a stator;

a rotor coil configured to generate a single-phase magnetic field, the single-phase magnetic field being rotationally fixed with respect to the rotor when excited from a direct current electrical energy source;

at least two stator coils configured to generate a poly-phase magnetic field that rotates with respect to the stator; and

a plurality of switches configured to generate the poly-phase magnetic field from the direct current electrical energy source such that the rotor rotates in response thereto;

the rotor coil being coupled in series with the direct energy source and the plurality of switches.

2. The motor of claim 1 wherein the electromagnetic motor includes three stator coils, each of the stator coils being configured to generate a magnetic filed shifted with respect to a magnetic field generated by an adjacent stator coil.

3. The motor of claim 2 wherein each of the stator coils is configured to generate a magnetic field shifted 60°

from an adjacent stator coil.

4. The motor of claim 2 wherein the electromagnetic motor includes six switches for generating the magnetic field of each of the stator coils.

5. The motor of claim 4 wherein the switches are IGBT switches.

6. The motor of claim 4 wherein three switches are turned on at one time.

7. The motor of claim 4 wherein two switches are turned on at one time.

8. The motor of claim 2 wherein the stator coils are connected in a wye configuration.

9. The motor of claim 2 wherein the stator coils are connected in a delta configuration.

10. The motor of claim 2 further comprising an air gap between the stator and rotor coils that is configured to increase the reluctance of the motor and thereby increase the torque generated by the motor.

11. A method for generating torque from a shaft of an electric motor having a rotor and a stator, the method comprising the following steps:

generating a single-phase magnetic field with a rotor coil of the electric motor, the single-phase magnetic field being rotationally fixed with respect to the rotor when excited from a direct current electrical energy source; and

generating a poly-phase magnetic field with respective stator coils such that the poly-phase magnetic field rotates with respect to the stator;

wherein a plurality of switches are used to generate the poly-phase magnetic field from the direct current electrical energy source such that the rotor rotates in response thereto;

wherein the rotor coil is connected is series with the direct current electrical energy source and the plurality of switches.

12. The method of claim 11 wherein three magnetic fields are generated by three stator coils.

13. The method of claim 12 wherein each of the stator coils is configured to generate a magnetic field shifted 60°

from an adjacent stator coil.

14. The method of claim 12 wherein six switches generate the magnetic field from each of the stator coils.

15. The method of claim 14 wherein the switches are IGBT switches.

16. The method of claim 14 further comprising the step of switching three of the switches on at the same time.

17. The method of claim 14 further comprising the step of switching two of the switches on at the same time.

18. The method of claim 12 wherein the stator coils are connected in a wye configuration.

19. The method of claim 12 wherein the stator coils are connected in a delta configuration.

20. The method of claim 12 further comprising the step of storing magnetic energy in an air gap between the stator and rotor in order to increase the reluctance of the motor and thereby increase the torque generated by the motor.