Calculations and measurements of the Unity Plus three-phase induction motor

Author

Medarametla, J.B. ; Cox, M.D. ; Baghzouz, Y.

Author_Institution

Dept. of Electr. Eng., Louisiana Tech. Univ., Ruston, LA, USA

Volume

7

Issue

4

fYear

1992

fDate

12/1/1992 12:00:00 AM

Firstpage

732

Lastpage

738

Abstract

The Unity Plus induction motor configuration for three-phase motors is described and analyzed. In the Unity Plus winding method only one set of windings, called the power winding, is connected directly to the source. The second set of windings is connected to capacitors and is coupled to the power winding through transformer action. The equivalent circuit of the Unity Plus motor for steady-state operation is obtained through standard induction motor analysis methods. Laboratory experiments on a 10 hp three-phase induction motor, both as a conventional winding configuration and as a Unity Plus configuration after rewinding by Unity Plus representatives, verified the accuracy of the circuit model and showed that the Unity Plus winding configuration did not result in higher efficiencies than that obtainable from conventional winding methods

Keywords

equivalent circuits; induction motors; machine testing; machine theory; machine windings; power capacitors; 10 hp; Unity Plus; capacitors; equivalent circuit; machine testing; machine theory; power winding; steady-state operation; three-phase induction motor; transformer action; Capacitors; Circuit testing; Equivalent circuits; Induction motors; Laboratories; Machine windings; Measurement units; Reactive power; Stator windings; Steady-state;

fLanguage

English

Journal_Title

Energy Conversion, IEEE Transactions on

Publisher

ieee

ISSN

0885-8969

Type

jour

DOI

10.1109/60.182656

Filename

182656