Back to results
US 5,642,013 AGranted
Permanent-magnet synchronous motor
OwnerNicolas Wavreinventor
Life of this patent
Estimating the term…
Abstract
The synchronous motor comprises an armature having a plurality of teeth solid with a yoke and spaced apart by slots in which coils are accommodated. An inductor comprising a plurality of magnets borne by a sole is spaced from the armature by an air-grap. The motor is so dimensioned that the teeth of the armature have a constant cross-section over their entire height and the width of the slots alongside the tooth heads is substantially equal to the width of these heads to minimize the parasitic reluctant effect due to the slots. The motor may be linear or rotary.
Claims22
A synchronous motor comprising:
- an armature formed by a yoke and a plurality of consecutive teeth fixed to said yoke and defining a plurality of consecutive open slots therebetween,
- a plurality of coils disposed in said slots and each arranged so as to surround at least one tooth of said armature, and
- an inductor disposed so as to face said teeth and said open slots and comprising a plurality of permanent magnets arranged on a flux returning sole with a constant pole pitch,
- said teeth being disposed regularly on said armature with a constant tooth pitch and having first identical widths at their free ends,
- said slots having second identical widths defined by said free ends of said teeth,
- the sum of said first width and said second width defining said tooth pitch,
- and the ratio of said second width to said tooth pitch being between about 0.40 and 0.55, such that the overall parasitic reluctant effect of a plurality of consecutive open slots is substantially less than the parasitic reluctant effect due to any single consecutive open slot.
4 more elements
Dependencies are inferred from the claim text.