CURRENT-ENERGIZED SYNCHRONOUS MOTOR, PARTICULARLY FOR VEHICLE DRIVES

• US 20100308686A1
• Filed: 08/28/2008
• Published: 12/09/2010
• Est. Priority Date: 08/28/2007
• Status: Active Grant

• Current Assignee: BRUSA Elektronik AG
• Original Assignee: BRUSA Elektronik AG
• Inventors: Mathoy, Arno
• Granted Patent: US 8,198,776 B2
• Time in Patent Office: Days
• US Class Current: 310/216.106
• CPC Class Codes: H02K 1/246 Variable reluctance rotors

Abstract

The invention relates to a current-energized synchronous motor (1) which is suitable in particular for vehicle drives. It consists of a stator (2) and a rotor (3) carrying the energizer winding (7), the rotor (3) having at least two rotor poles (4) with one energizer winding (7) each. The essential feature of the invention is that at least one selective magnetic flux barrier, in particular in the form of a radial slot (8) along the main axis (4A) of the rotor pole (4), is provided in each rotor pole (4) for increasing the reluctance moment of the current-energized synchronous motor (1).

Claims

1. A current-energized synchronous motor (1), in particular for vehicle drives, comprising a stator (2) and a rotor (3), the rotor (3) having at least two rotor poles (4) with one energizer winding (7) each, wherein at least one selective magnetic flux barrier, in particular in the form of a radial slot (8) being provided along the main axis (4A) of the rotor pole (4) in each rotor pole (4) for increasing the reluctance moment of the synchronous motor (1).

2. The current-energized synchronous motor as claimed in claim 1, wherein the rotor poles (4) are in the form of salient poles, and wherein the slots (8) acting as selective flux barriers and present in pole shanks (5) are in the form of radial longitudinal openings parallel to the main pole axis (4A).

3. The current-energized synchronous motor as claimed in claim 1, wherein the radial slot (8) acting as a flux barrier has a length (L) and a width (B), the length (L) of the slot (8) being chosen to be from ¾

to ⅚

of the rotor radius (R) minus the shaft radius (12), and the width (B) of the slot (8) being chosen to be between about 1/10 and 1/15 of the shaft width (W).

4. The current-energized synchronous motor as claimed in claim 1, wherein a permanent magnet (13) which saturates mechanical bridges in the flux barrier and thus extends the effect of the flux barrier to the total region of the longitudinal axis of the rotor pole (4) is arranged in the rotor pole (4) at least in a section of the slot (8) acting as a flux barrier.

5. The current-energized synchronous motor as claimed in claim 4, wherein the outer end of the permanent magnet (13) is supported in the radial slot (8) by a web (14) formed transversely to the radial direction.

6. The current-energized synchronous motor according to claim 1, the rotor lamellae packet and the end plate having a connecting means which connects the individual parts to one another to form one piece, wherein the connecting means (15) is arranged within the slot (8) acting as a flux barrier.

7. A current-energized synchronous motor (1), in particular for vehicle drives, comprising a stator (2) and a rotor (3), the rotor (3) having at least two rotor poles (4) with one energizer winding (7) each, wherein at least one selective magnetic flux barrier, in particular in the form of a radial slot (8) being provided along the main axis (4A) of the rotor pole (4) in each rotor pole (4) for increasing the reluctance moment of the synchronous motor (1), and wherein a permanent magnet (13) which saturates mechanical bridges in the flux barrier and thus extends the effect of the flux barrier to the total region of the longitudinal axis of the rotor pole (4) is arranged in the rotor pole (4) at least in a section of the slot (8) acting as a flux barrier, and wherein the direction of magnetization of said permanent magnet (13) is tangential with respect to the direction of rotation of said motor.

8. The current-energized synchronous motor (1) of claim 7, characterized in that the permanent magnet (13) is magnetized such, that it does not add to the working flux.

9. The current-energized synchronous motor as claimed in claim 7, wherein the outer end of the permanent magnet (13) is supported in the radial slot (8) by a web (14) formed transversely to the radial direction.

10. The current-energized synchronous motor according to any one of claim 7, wherein the rotor lamellae packet and the end plate having a connecting means which connects the individual parts to one another to form one piece, and wherein the connecting means (15) is arranged within the slot (8) acting as a flux barrier.

11. The current-energized synchronous motor as claimed in claim 7, wherein the rotor poles (4) are in the form of salient poles, and wherein the slots (8) acting as selective flux barriers and present in pole shanks (5) are in the form of radial longitudinal openings parallel to the main pole axis (4A).

12. The current-energized synchronous motor as claimed in claim 7, wherein the radial slot (8) acting as a flux barrier has a length (L) and a width (B), the length (L) of the slot (8) being chosen to be from ¾

to ⅚

of the rotor radius (R) minus the shaft radius (12), and the width (B) of the slot (8) being chosen to be between about 1/10 and 1/15 of the shaft width (W).