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US 6,664,690 B2Granted
Permanent magnet excited rotor for a permanent magnet excited electric drive, particularly for AC main drives
AssigneeSiemens Aktiengesellschaft
InventorGerhard Huth
Life of this patent
Estimating the term…
Abstract
For achieving a constant capacity range by way of field weakening of a permanent magnet excited drive the magnetic transverse resistance (Rm) of the rotor plate pack is increased by pole gaps (P1, P2), which are produced by milling into the upper surface (O) of the rotor plate section (L), or are punched into the rotor plate section (L), whereby a covering of the poles of Tp in the range of from 70% to 80% has been shown to be particularly advantageous.
Claims15
A permanent magnet excited rotor for an electric drive and disposed in a stator comprising:
- a rotor plate pack composed of a plurality of rotor plate sections and defining a transverse axis, said rotor plate pack having an outer surface spaced from an opposite surface of the stator at formation of an air gap;
- and
- a plurality of permanent magnets arranged upon the outer surface of the rotor plate pack;
- wherein each of the rotor plate sections of said rotor plate pack has pole gaps to increase a magnetic transverse resistance in a direction of the transverse axis;
- wherein the pole gaps have a depth which is greater than a width of the air gap between the rotor and the stator.
2 more elements
A permanent magnet excited electric drive, comprising:
- a stator including a three-phase stator winding with a predetermined number of pole pairs;
- and
- a rotor including a rotor plate pack, which is formed with pole gaps to increase the magnetic transverse resistance in a direction of a transverse axis of the rotor, and has an outer surface spaced from an opposite surface of the stator at formation of an air gap, and a plurality of permanent magnets received peripherally upon the outer surface of the rotor plate pack, wherein the pole gaps have a depth which is greater than a width of the air gap between the rotor and the stator, said rotor including a same number of pole pairs as the stator.
Dependencies are inferred from the claim text.