TRACTION DRIVE OF A RAIL VEHICLE FOR DRIVING AND GENERATIVE BRAKING

• US 20100066281A1
• Filed: 10/25/2007
• Published: 03/18/2010
• Est. Priority Date: 10/31/2006
• Status: Active Grant

• Current Assignee: Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH (Estate of Heinz Hermann Thiele)
• Original Assignee: Knorr-Bremse Systeme FüR Schienenfahrzeuge GmbH (Estate of Heinz Hermann Thiele)
• Inventors: Hähle, Falk, Friesen, Ulf
• Granted Patent: US 8,179,063 B2
• Time in Patent Office: Days
• US Class Current: 318/380
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 7/003 Dynamic electric braking by short circuiting the motor
• CPC Class Codes: B60L 7/06 for vehicles propelled by ac motors
• CPC Class Codes: B60L 7/08 Controlling the braking effect B60L7/04, B60L7/06 take precedence
• CPC Class Codes: B60L 7/22 Dynamic electric resistor braking, combined with dynamic electric regenerative braking
• CPC Class Codes: H02P 2207/05 Synchronous machines, e.g. with permanent magnets or DC excitation
• CPC Class Codes: H02P 3/22 by short-circuit or resistive braking
• CPC Class Codes: H02P 5/74 controlling two or more ac dynamo-electric motors H02P5/46, H02P5/60 take precedence
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

The invention relates to a traction drive for the driving and generative braking of a rail vehicle or a combination of rail vehicles, a permanent-field synchronous motor and a traction current converter being respectively associated with at least two axles of the rail vehicle or combination of rail vehicles. The traction current converter includes at least one pulse current converter on the engine side, and the clamps of the permanent-field synchronous motor are connected to a change-over switch such that the permanent-field synchronous motor can be connected to a load circuit containing at least one load element, in order to drive the pulse current converter or for generative braking. According to the invention, the load circuits connected to the permanent-field synchronous motors for generative braking are designed such that the brake characteristic lines of the permanent-field synchronous motors differ in terms of characteristic features such as the position of the maximum of the brake torque according to the rotational speed.

Claims

1. A traction drive configured to drive, and to perform regenerative braking of a rail vehicle or a combination of rail vehicles, the traction drive comprising:

a permanently excited synchronous motor and a traction current converter each assigned to at least two axles of the rail vehicle or of the combination of rail vehicles, wherein the traction current converter has at least one machine-side pulse current converter, and

a changeover switch that is connected to the permanently excited synchronous motor is connected at its terminals in such a way that the permanently excited synchronous motor is selectively connected to a load circuit containing at least one load element to drive the pulse current converter or to perform regenerative braking,

wherein the load circuits which are connected to the permanently excited synchronous motors to perform regenerative braking are configured in such a way that the brake characteristic curves of the permanently excited synchronous motors are different in terms of characteristic features.

2. The traction drive of claim 1, wherein the permanently excited synchronous motors which are identical but are provided with different load circuits are combined with one another in such a way that a braking torque profile produced by superimposing the braking characteristic curves increases or decreases when plotted against the rotational speed n.

3. The traction drive of claim 1, wherein the at least two axles are assigned to a bogie, a rail vehicle component, an individual vehicle or a combination of rail vehicles.

4. The traction drive of claim 1, wherein the load circuits of the permanently excited synchronous motors differ in having load elements which are different from one another and/or in having different connections of their load elements.

5. The traction drive of claim 4, wherein the load circuits contain resistors and/or capacitors and/or inductors.

6. The traction drive of claim 5, wherein the permanently excited synchronous motors include a first and second permanently excited synchronous motor and wherein the load circuits have different braking resistors such that the maximum braking torque M_max of the braking characteristic curve of a first permanently excited synchronous motor assigned to the one axle occurs at a lower rotational speed n than the maximum braking torque M_max of the braking characteristic curve of the second permanently excited synchronous motor which is assigned to the other axle.

7. The traction drive of claim 1, wherein one of the differing characteristic features is the position of the maximum braking torque M_max as a function of the rotational speed n.