Radial pole linear reluctance motor

A linear variable reluctance motor having relatively movable armature and stator members, and electromagnetically windings on at least one of said members forming an electromagnetically active envelope of said first and second members, characterized by in that:

• a first member comprising a ferromagnetic shaft having double helix tooth pattern with outside diameter forming a smooth even cylinder;
• and
• a second member comprising a stack of laminar pairs of alternate radial pole ferromagnetic laminar plates and nonferromagnetic laminar spacers, with an internal channel having an inside diameter complementary to the outside diameter of said first member to allow a sliding relationship within the electromagnetically active envelope of said first and second members, each laminar pair of laminar pole plate and laminar spacer together being dimensioned in total thickness slightly less than one tooth space, said stack being bonded by spacing cement layers interspersed between said laminar pole plate and said laminar spacer, and of total thickness greater than necessary for bonding, the sum of said spacing cement layers complementing the total thickness of said laminar pairs to achieve nominal stack length,
• whereby the teeth are positioned with their average linear tooth interval equal to the nominal tooth spacing average.

A linear variable reluctance motor having electromagnetic windings, and having relatively movable armature and stator members operating under electromagnetic control within an electromagnetically active envelope characterized by

• a first member comprising a ferromagnetic shaft having a raised double helix thread tooth pattern, filled between teeth with nonferromagnetic material and with the filled pattern coated with a smoothing layer with outside diameter forming a smooth even cylinder;
• and
• a second member comprising a stack of laminar pairs of alternate radial pole ferromagnetic laminar plates and nonferromagnetic laminar spacers, with an internal channel having an inside diameter complementary to the outside diameter of said first member to allow a sliding relationship within the electromagnetically active envelope, each laminar pair of laminar plate and laminar spacer together being dimensioned in total thickness slightly less than one tooth space, and stack being bonded by epoxy spacing cement layers interspersed between said laminar pole plates and said laminar spacers, the total thickness of spacing cement being slightly greater than necessary for bonding, the sum of said spacing cement layers complementing the total thickness of said laminar pairs to achieve nominal stack length,
• whereby the teeth are positioned with their average linear tooth interval equal to the nominal tooth spacing,
• and said first member and said second member are in sliding contact relationship within the electromagnetically active envelope.