Doubly salient variable reluctance machine with stationary permanent magnets or auxiliary field windings

A permanent magnet machine comprising;

• rotor mounted for rotation about a central axis, said rotor further comprising,
• multiple of six salient rotor poles evenly spaced around said central axis and extending outward therefrom;
• and
• a stator, said stator further comprising,
• a yoke surrounding said rotor;
• a multiple of four salient stator poles extending from said yoke toward said rotor, said stator poles being spaced at equal angular intervals around said yoke and being arranged with respect to said rotor poles to provide a constant air-gap reluctance during rotation of said rotor within said stator,
• a plurality of stator windings each being individually coiled about two diametrically opposite stator poles;
• and
• a plurality of permanent magnets embedded in said yoke, said magnets being spaced at equal angular intervals around said yoke and being polarized transversely to said central axis to serve as a source of primary flux for magnetizing the machine, said magnets also serving to create a reluctance for blocking the circulation of flux through said yoke, wherein said yoke comprises a plurality of similar sections arranged symmetrically about said central axis, each of said sections having an equal portion of said stator salient poles thereon, and wherein one each of said plurality of permanent magnets is interposed between the ends of two adjacent ones of said yoke sections.

A variable reluctance machine comprising:

• a rotor mounted for rotation about a central axis, said rotor further comprising:
• a multiple of six salient rotor poles evenly spaced around said central axis;
• and
• a stator surrounding said rotor, said stator further comprising:
• a yoke;
• a multiple of four salient stator poles extending from said yoke toward said rotor, said stator poles being spaced at equal angular intervals around said central axis and being arranged with respect to said rotor poles to provide a constant air gap reluctance during rotation of said rotor within said stator,
• a plurality of stator windings each being individually coiled about two diametrically opposite stator poles, and
• at least one auxiliary winding wound along the length of said yoke on diametrically opposite sides of said yoke to serve as a source of primary excitation flux.

A variable reluctance machine comprising:

• a rotor mounted for rotation about a central axis, said rotor further comprising:
• a multiple of twelve salient rotor poles evenly spaced around said central axis;
• and
• a stator surrounding said rotor, said stator further comprising:
• a yoke;
• eight salient stator poles extending from said yoke toward said rotor, said stator poles being spaced at equal angular intervals around said central axis and being arranged with respect to said rotor poles to provide a constant air gap reluctance during rotation of said rotor within said stator,
• a plurality of stator windings each being individually coiled about two diametrically opposite stator poles;
• first and second permanent magnets imbedded in said yoke diametrically opposite from one another to provide a first portion of the excitation flux of said machine;
• first and second auxiliary windings, said auxiliary windings each being wound about said yoke diametrically opposite one another and in a plane that is perpendicular to the plane containing said first and second magnets;
• and
• means for energizing said first and second auxiliary windings from a direct current source to provide a second portion of the excitation flux of said machine.

A variable reluctance machine comprising:

• a rotor mounted for rotation about a central axis, said rotor further comprising:
• a multiple of six salient rotor poles evenly spaced around said central axis;
• and
• a stator surrounding said rotor, said stator further comprising:
• a yoke;
• a multiple of four salient stator poles extending from said yoke toward said rotor, said stator poles being spaced at equal angular intervals around said central axis and being arranged with respect to said rotor poles to provide a constant air gap reluctance during rotation of said rotor within said stator;
• a plurality of stator windings each being individually coiled about two diametrically opposite stator poles;
• at least two permanent magnets embedded in said yoke, said magnets being spaced at equal angular intervals around said yoke, and at least one auxiliary winding wound along the length of said yoke on diametrically opposite sides of said yoke, wherein said at least two permanent magnets and said at least one auxiliary winding serve as a source of primary excitation flux of said machine, said primary excitation flux including first and second portions, respectively;
• wherein the machine further comprises means for energizing said at least one auxiliary winding from a direct current source to provide said second portion of the primary excitation flux of said machine;
• and
• wherein said at least two permanent magnets serve as a source of said first portion of said primary excitation flux.