Propulsion arrangement equipped with a linear motor

• US 3,884,154 A
• Filed: 12/18/1972
• Issued: 05/20/1975
• Est. Priority Date: 12/23/1971
• Status: Expired due to Term

• Current Assignee: Fritz Marten
• Original Assignee: Fritz Marten
• Inventors: Marten, Fritz
• Primary Examiner(s): Wood, Jr., M. Henson
• Assistant Examiner(s): Eisenzopf, Reinhard J.
• Application Number:
  US05/315,933
• Time in Patent Office: 883 Days
• Field of Search: 104/148SS,148LM,148MS 310/12,13,165,162
• US Class Current: 104/286
• CPC Class Codes: B60L 13/03 Electric propulsion by linear motors
• CPC Class Codes: B60L 13/10 Combination of electric propulsion and magnetic suspension or levitation
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence
• CPC Class Codes: Y10S 174/16 in a motive power system, e.g. electric motor control system
• CPC Class Codes: Y10S 505/905 Motor structure

Abstract

A propulsion arrangement for a body movable along a track defining a direction of motion is disclosed. The arrangement includes a winding carrier assembly which coacts with a ferromagnetic return to develop a propulsion force for moving the body. The carrier assembly has two stacks of laminations carrying windings for developing a travelling wave; these windings are displaced with respect to each other by one pole pitch. The ferromagnetic return includes bars arranged transversely to the direction of motion. The arrangement of the bars constitutes a substantial simplification of the magnetic return and enables a simplified track switch layout to be obtained.

Claims

1. A propulsion arrangement for a body movable along a track defining a direction of motion, the body being subjected to outer forces such as centrifugal forces, comprising a winding carrier assembly including two ferromagnetic winding carriers disposed next to each other transversely to the direction of motion, said carriers having respective outermost outside surfaces extendiNg in the direction of motion and facing away from each other, said surfaces being spaced a distance m from each other, a common direct-current excitation winding mounted on said carriers, additional windings mounted on said winding carriers for developing a travelling wave, said additional windings being displaced one from the other by one pole pitch Tau p;

and ferromagnetic return means for coacting with said winding carrier assembly for developing a propulsion force for moving the body, said ferromagnetic return means comprising a plurality of ferromagnetic bars arranged in a row transverse to the direction of motion, each of said bars having a length corresponding to said distance m and being a width b having a value defined by the relation;

b <

OR = Tau p, and each two mutually adjacent ones of said bars having a center-to-center spacing corresponding to twice said pole pitch 2 Tau p, said ferromagnetic winding carriers being positioned relative to said ferromagnetic return means so that the attraction forces developed between said winding carriers and said return means are opposed to the outer forces, and an electrodynamic guidance system having a support and guidance arrangement equipped with conductor loops for generating a flux having a low loss zone of zero flux value, said support and guidance arrangement also having a stabilization arrangement, said electrodynamic guidance system and said winding carrier assembly together with said return means being arranged relative to each other so as to cause the lift component of the forces developed between said carrier assembly and said return means to act to maintain said stabilization arrangement in said zone.

2. The propulsion arrangement of claim 1, said additional windings constituting a single set of three-phase windings having winding branches displaced from each other by one pole pitch Tau p.

3. The propulsion arrangement of claim 1, said additional windings constituting two three-phase windings disposed one next to the other transversely to the direction of motion and displaced one from the other by one pole pitch.

4. The propulsion arrangement of claim 1 comprising an electrodynamic suspension and guidance system having a ferromagnetic return structure, said return means and said return structure being configured as a unitary structure.

5. The propulsion arrangement of claim 4, said unitary structure being an angular comb-like rail.

6. The propulsion arrangement of claim 5, the tines of said comb-like rail being said ferromagnetic bars.

7. The propulsion arrangement of claim 1, said ferromagnetic bars having respective surfaces adjacent said winding carriers, the arrangement comprising a layer of good electrically conductive material covering said surfaces of said bars.

8. The propulsion arrangement of claim 7, said layer being a ribbon of good electrically conductive material bridging said bars.

9. The propulsion arrangement of claim 1, said ferromagnetic winding carriers conjointly defining a U-shaped member, said direct-current excitation winding being mounted on the bight portion of said U-shaped member, and said additional windings being mounted on the leg portions of said U-shaped member.