Linear motor with patterned magnet arrays
View Patent ↗An armature for a linear motor is described. The armature includes a first of a pair of magnetic structures comprising a first plurality of maglettes each having a magnetic polarity vector; an angle between two adjacent magnetic polarity vectors in the first plurality of maglettes having a first magnitude; and a second of the pair of magnetic structures comprising a second plurality of maglettes each having a magnetic polarity vector; an angle between two adjacent magnetic polarity vectors in the second plurality of maglettes having a second magnitude, the first plurality of maglettes including a first outer maglette that is adjacent to a second outer maglette of the second plurality of maglettes, an angle between the magnetic polarity vectors of the first and second outer maglettes having a third magnitude that is different than at least one of the first and the second magnitudes.
1. An armature for a motor, the armature comprising:
a first and second magnetic structure forming a first spatial period of the armature;
(i) wherein the first magnetic structure has a first magnetic polarity and includes a first plurality of maglettes, the first plurality of maglettes comprising:
at least two outer maglettes and at least two inner maglettes, wherein at least two maglettes of the first plurality of maglettes are arranged adjacent to one another, each maglette of the first plurality of maglettes has associated therewith a magnetic polarity vector and wherein an angle between the magnetic polarity vectors of each pair of maglettes that are adjacent to one another within the first plurality of maglettes has a first angle magnitude between about 45 degrees and 30 degrees;
(ii) wherein the second magnetic structure is adjacent the first magnetic structure and has a second magnetic polarity that is different from the first magnetic polarity, the second magnetic structure comprising a second plurality of maglettes comprising:
at least two outer maglettes and at least two inner maglettes, wherein at least two maglettes of the second plurality of maglettes are arranged adjacent to one another, each maglette of the second plurality of maglettes has associated therewith a magnetic polarity vector, wherein an angle between the magnetic polarity vectors of each pair of maglettes that are adjacent to one another within the second plurality of maglettes has a second angle magnitude between about 45 degrees and 30 degrees, and;
wherein an angle between a magnetic polarity vector of a first outer maglette of the first plurality of maglettes and the magnetic polarity vector of an adjacent second outer maglette of the second plurality of maglettes has a third angle magnitude between about 45 degrees and 90 degrees, where the third angle magnitude is different from the first and second angle magnitudes.
2. The armature of claim 1 wherein the first and the second angle magnitudes are substantially the same.
3. The armature of claim 1 wherein the first and the second magnetic structures comprise a first side of the armature.
4. The armature of claim 1 wherein the armature is substantially cylindrical in shape and each of the first and the second magnetic structures is one of substantially disk-shaped or ring-shaped.
5. The armature of claim 1 wherein at least two maglettes in the first magnetic structure differ in dimension and at least two maglettes in the second magnetic structures differ in dimension.
6. The armature of claim 1 wherein at least one of the first and the second plurality of maglettes comprises two outer maglettes and two inner maglettes, a magnitude of the angles of the magnetic polarity vectors of the outer maglettes relative to a perpendicular to a direction of motion of the armature is substantially 45 degrees, and a magnitude of the angles of the magnetic polarity vectors of the inner maglettes relative to a perpendicular to a direction of motion of the armature is substantially 15 degrees.
7. The armature of claim 1 wherein the first magnetic polarity of the first magnetic structure is substantially opposite to the second magnetic polarity of the second magnetic structure.
8. The armature of claim 1 wherein at least one of the pair of magnetic structures is magnetized as a whole.
9. A motor comprising:
an armature, the armature comprising;
a first and second magnetic structure forming a first spatial period of the armature;
(i) wherein the first magnetic structure has a first magnetic polarity and includes a first plurality of maglettes, the first plurality of maglettes comprising:
at least two outer maglettes and at least two inner maglettes, wherein at least two maglettes of the first plurality of maglettes are arranged adjacent to one another, each maglette of the first plurality of maglettes has associated therewith a magnetic polarity vector and wherein an angle between the magnetic polarity vectors of each pair of maglettes that are adjacent to one another within the first plurality of maglettes has a first angle magnitude between about 45 degrees and 30 degrees;
(ii) wherein the second magnetic structure is adjacent the first magnetic structure and has a second magnetic polarity that is different from the first magnetic polarity, the second magnetic structure comprising a second plurality of maglettes comprising:
at least two outer maglettes and at least two inner maglettes, wherein at least two maglettes of the second plurality of maglettes are arranged adjacent to one another, each maglette of the second plurality of maglettes has associated therewith a magnetic polarity vector, wherein an angle between the magnetic polarity vectors of each pair of maglettes that are adjacent to one another within the second plurality of maglettes has a second angle magnitude between about 45 degrees and 30 degrees;
wherein an angle between a magnetic polarity vector of a first outer maglette of the first plurality of maglettes and the magnetic polarity vector of an adjacent second outer maglette of the second plurality of maglettes has a third angle magnitude between about 45 degrees and 90 degrees, where the third angle magnitude is different from the first and second angle magnitudes; and
a stator positioned proximate to the armature.
10. The armature of claim 1 further comprising third and fourth magnetic structures forming a second spatial period equal to the first spatial period, each magnetic structure having a magnetic polarity,
the third magnetic structure comprising a third plurality of maglettes;
the fourth magnetic structure comprising a fourth plurality of maglettes;
wherein each maglette in the third plurality of maglettes is adjacent to a respective maglettes in the first plurality of maglettes, and each maglettes in the fourth plurality of maglettes is adjacent to a respective maglette in the second plurality of maglettes; and
the magnetic polarity of the third magnetic structure is oriented in the same direction as the magnetic polarity of the first magnetic structure, and the magnetic polarity of the fourth magnetic structure is oriented in the same direction as the magnetic polarity of the second magnetic structure.
11. The armature of claim 3 wherein the armature further comprises a plurality of discrete sides, each of which comprises at least a pair of magnetic structures.
12. The armature of claim 6 wherein the first and the second magnetic structures comprise a first side of the armature, the armature further comprising a plurality of discrete sides wherein each of the plurality of discrete sides comprises at least a pair of magnetic structures.
13. The armature of claim 11 wherein the armature is substantially cylindrical in shape.
14. The armature of claim 6 wherein the armature is substantially cylindrical in shape.