Method for providing slip energy control in permanent magnet electrical machines

• US 7,134,180 B2
• Filed: 09/16/2005
• Issued: 11/14/2006
• Est. Priority Date: 11/12/2003
• Status: Expired due to Fees

• Current Assignee: UT-Battelle LLC
• Original Assignee: UT-Battelle LLC
• Inventors: Hsu, John S.
• Primary Examiner(s): Vo, Peter
• Assistant Examiner(s): Cazan, Livius Radu
• Application Number:
  US11/228,679
• Publication Number:
  US 20060028084A1
• Time in Patent Office: 424 Days
• Field of Search: 292/96, 295/98, 310/180, 310/184, 310/114, 310/171, 310/105, 310/206, 310/107, 310/210, 310/256, 310/266, 310/268, 310/166, 310/168, 310/68.B
• US Class Current: 29/596
• CPC Class Codes: B60Y 2400/607 Axial flux machines
• CPC Class Codes: H02K 16/00 Machines with more than one rotor or stator machines for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts H02K51/00; permanent magnet machines with multiple rotors or stators relatively rotated for vectorially combining the excitation fields or the armature voltages H02K21/029
• CPC Class Codes: H02K 19/06 Motors having windings on the stator and a variable-reluctance soft-iron rotor without windings, e.g. inductor motors
• CPC Class Codes: H02K 19/103 Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
• CPC Class Codes: H02K 21/24 with magnets axially facing the armatures, e.g. hub-type cycle dynamos
• CPC Class Codes: H02K 51/00 Dynamo-electric gears, i.e. dynamo-electric means for transmitting mechanical power from a driving shaft to a driven shaft and comprising structurally interrelated motor and generator parts
• CPC Class Codes: H02K 99/10 Generators
• CPC Class Codes: H02K 99/20 Motors
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

An electric machine (40) has a stator (43), a permanent magnet rotor (38) with permanent magnets (39) and a magnetic coupling uncluttered rotor (46) for inducing a slip energy current in secondary coils (47). A dc flux can be produced in the uncluttered rotor when the secondary coils are fed with dc currents. The magnetic coupling uncluttered rotor (46) has magnetic brushes (A, B, C, D) which couple flux in through the rotor (46) to the secondary coils (47c, 47d) without inducing a current in the rotor (46) and without coupling a stator rotational energy component to the secondary coils (47c, 47d). The machine can be operated as a motor or a generator in multi-phase or single-phase embodiments and is applicable to the hybrid electric vehicle. A method of providing a slip energy controller is also disclosed.

Claims

1. A method of providing slip energy control in a permanent magnet electrical machine comprising a stator and a magnet coupling uncluttered rotor provided with a plurality of elements for coupling flux to a secondary coil, the method comprising:

inducing a flux in the magnetic coupling uncluttered rotor across a first air gap located between the stator and the magnetic coupling uncluttered rotor by conducting a current in a primary winding of the stator of the electrical machine and by positioning a permanent magnet rotor with permanent magnets in said first air gap;

positioning the secondary coil across a second air gap from the magnetic coupling uncluttered rotor and facing the magnetic coupling uncluttered rotor; and

inducing a slip current in the secondary coil by magnetically coupling the flux through the magnetic coupling uncluttered rotor without inducing a current in the magnetic coupling uncluttered rotor.

2. The method of claim 1, further comprising supplying a dc current in the secondary coil to produce a dc flux in the uncluttered rotor.

3. The method of claim 1, wherein the primary air gap is disposed axially along an axis of rotation for the rotor and wherein the second air gap is also disposed axially along an axis of rotation for the rotor.

4. The method of claim 1, wherein the machine is operated as an ac induction machine.

5. The method of claim 1, wherein the machine is operated as a motor.

6. The method of claim 1, wherein the machine is operated as a generator.

7. The method of claim 1, wherein a dc excitation is provided to the secondary coil for operating the machine at synchronous speed.

8. The method of claim 1, wherein a dc excitation is provided to the secondary coil for operating the machine as a brushless dc machine.