Static magnetic frequency multiplies

A static magnetic frequency multiplier comprising:

• laminated iron structures forming a closed magnetic circuit;
• a polyphase primary winding distributed in slots in two sides of one of the structures and having a number of pole pairs p.sub.1, the winding being such that a voltage will be induced at its terminals substantially only by the fundamental of a field having the pole pair p.sub.1 ;
• a secondary winding distributed in the slots and magnetically coupled to the primary winding, the secondary winding having a number of pole pairs p.sub.2, where p.sub.2 is an uneven multiple of p.sub.1, the secondary winding being such that no voltage can be induced at its terminals by the fundamental of a field having the pole pair number p.sub.1 ;
• the primary winding and the secondary winding being ring windings;
• the iron structures having at least one magnetic return path at least a portion of which is subjected to pronounced magnetic saturation by the magnetic field produced by the primary winding when it is supplied with the nominal primary voltage at the nominal frequency;
• and
• the magnetic return path being provided by the laminated iron resting against the tooth tops of the first named iron structure, separated therefrom only by a thin insulating layer.

A static magnetic frequency multiplier comprising:

• laminated iron structures forming a closed magnetic circuit;
• a polyphase primary winding, distributed in slots in one of the structures and having a number of pole pairs p.sub.1, the winding being such that a voltage will be induced at its terminals substantially only by the fundamental of a field having the pole pair p.sub.1 ;
• a secondary winding distributed in slots in one of the structures and magnetically coupled to the primary winding, the secondary winding having a number of pole pairs p.sub.2, where p.sub.2 is an uneven multiple of p.sub.1, the secondary winding being such that no voltage can be induced at its terminals by the fundamental of a field having the pole pair number p.sub.1 ;
• the iron structures having at least one magnetic return path at least a portion of which is subjected to pronounced magnetic saturation by the magnetic field produced by the primary winding when it is supplied with the nominal primary voltage at the nominal frequency;
• and
• non-magnetic attenuator elements having high electric conductivity;
• disposed adjacent to the magnetically saturated parts of the laminated iron structures for preventing escape of saturated flux, the attenuator elements being inserts disposed in the slots and insulated from the teeth.

A static magnetic frequency multiplier comprising:

• laminated iron structures forming a closed magnetic circuit, the laminated iron structures being cylindrical and hollow cylindrical, respectively, and fitted inside one another, one of the iron structures being slotted and the second iron structure being unslotted;
• a polyphase primary winding distributed in the slots of the slotted iron structure and having a number of pole pairs p.sub.1, the winding being such that a voltage will be induced at its terminals substantially only by the fundamental of a field having the pole pair p.sub.1 ;
• a secondary winding distributed in the same slots as the primary winding and magnetically coupled thereto, the secondary winding having a number of pole pairs p.sub.2, where p.sub.2 is an uneven multiple of p.sub.1, the secondary winding being such that no voltage can be induced at its terminals by the fundamental of a field having the pole pair number p.sub.1 ;
• the second, unslotted iron structure having a magnetic return path, at least a portion of which is subjected to pronounced magnetic saturation by the magnetic field produced by the primary winding when it is supplied with the nominal primary voltage at the nominal frequency;
• and
• a thin layer of insulating material separating the tooth tops on the slotted iron structure from the unslotted iron structure.