%% Single-Phase Asynchronous Machine - Voltage Control of Auxiliary Winding
%
% This example shows a drive acting on the auxiliary winding of a single-phase synchronous machine.
%
% H.Ouquelle and Louis-A.Dessaint (Ecole de technologie superieure,
% Montreal)
% Copyright 1997-2012 Hydro-Quebec, and The MathWorks, Inc.
%%
open_system('power_asm1ph_auxcontrol')
%% Description
%
% The motor's main winding is directly connected to the 110 V utility supply. The auxiliary winding is fed by a H-bridge IGBT inverter connected to a rectifier.
%
% The reference values of the magnitude and phase of voltage applied to the auxiliary winding are computed by the Reference Voltage block [1].
% By varying the auxiliary winding voltage magnitude and phase, the torque ripples are alleviated at all operating points.
% The voltage control loop uses a proportional-integral-derivative (PID) controller.
%
%% Simulation
%
% Start the simulation. The machine starts at no load and then at t=1.0 sec, once the machine has reached its steady state,
% the load torque is increased to its nominal value (1 N.m) in 0.5 sec.
%
% Observe that torque ripples are substantially mitigated at all operating points.
% Also observe the auxiliary and winding currents. These currents are in quadrature and their magnitude ratio is equal to the ratio N of number of turns
% of auxiliary and main windings.
%% Reference
%
% [1] COLLINS, E.R., PUTTGEN, H.B., and SYLE, W.E.'Single-Phase Induction Motor Adjustable Speed Drive:
% Drive Phase Angle Control Of the Auxiliary Winding Supply'. IEEE(R) Industrial Application Society annual meeting conference records, pp.246-252
%
%%
clear all
close all
bdclose all
