High efficiency electrical machine with minimized material content
AssigneeMagneTek Century Electric, Inc.
InventorBruce T. Hein
Life of this patent
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Abstract
An improved method is provided for the design of high-efficiency electric machines. The maximum practical value of air gap flux density B.sub.g is selected, consistent with maintaining acceptable noise and vibration levels. The value of B.sub.g selected is then used to determine the dimensions of the stator and rotor laminations so as to result in flux density levels that minimize core loss, stator I.sup.2 R and rotor I.sup.2 R losses, and magnetizing current requirements.
Claims5
An electrical machine having minimized material content, comprising a laminated stator and rotor with the laminations designed by:
- (a) selecting the maximum practical value of air gap flux density B.sub.g consistent with maintaining acceptable noise and vibration levels;
- (b) using the value of B.sub.g selected to determine the dimensions of the stator and rotor laminations so as to result in flux density levels that minimize core losses and magnetizing current requirements.
An electrical machine having minimized material content, comprising a laminated stator and rotor with the laminations designed by:
- (a) selecting as an initial parameter the maximum practical value of air gap flux density consistent with maintaining acceptable noise and vibration levels;
- (b) selecting dimensions for the stator and rotor laminations based upon the selected value of air gap flux density;
- (c) evaluating I.sup.2 R loss in the stator winding;
- (d) evaluating I.sup.2 R loss in the rotor winding;
- (e) evaluating core loss in the stator and rotor laminations;
- (f) adjusting the dimensions of the stator and rotor laminations and the stator and rotor windings until the summation of the core loss, stator I.sup.2 R loss and rotor I.sup.2 R loss is minimized;
- and
- (g) shaping the rotor slots so as to result in the amount of slot leakage reactance required to limit inrush currents.
Dependencies are inferred from the claim text.