Abstract
The author presents a field analysis for slip-ring induction motors with general external impedance asymmetry. The method is based upon a rotating-field theory approach including spatial magneto motive force harmonics. It is shown that a series of non-mains frequency voltages are induced in the stator winding for both balanced and unbalanced rotors. The method is also used to derive the harmonic equivalent circuit for a balanced three-phase slip-ring motor with a skewed rotor. The analysis is verified by comparing predicted torque and current characteristics with measured values obtained from a machine with a balanced rotor and with a rotor connected to asymmetrical external resistances.
| Original language | English |
|---|---|
| Pages | 31-37 |
| Publication status | Published - 1989 |
Keywords
- Electric Networks--Equivalent Circuits
- Electric Windings, Machine
- Mathematical Techniques--Harmonic Analysis
- Rotors, Balanced/Unbalanced Rotors
- MMF Harmonics
- Rotating Field Theory
- Rotor/Stator Harmonic Coupling Impedance
- Slip-Ring Induction Motors
- Torque Calculations, Electric Motors, Induction