DC shunt motor Experiment

1. The load is gradually reduced while the load is maintained and maintained.

The measured data, N, and Matlab are used to process the data to obtain the working characteristics and mechanical characteristics.

U= 220;

If = 0.058;

If2 = 0.1;

IA = [1.2 1.1 1 0.95 0.9 0.85 0.81 0.75 0.7 0.65 0.6 0.55 0.53 0.29];

N = [1600 1634 1656 1666 1672 1680 1688 1700 1712 1722 1739 1748 1755 1824];

If = [0.83 0.75 0.65 0.6 0.56 0.52 0.48 0.43 0.38 0.33 0.29 0.24 0.22 0];

T2 = [1.08 1 0.88 0.83 0.78 0.74 0.7 0.64 0.59 0.54 0.49 0.43 0.42 0.18];

P2 = 0.105 * n. * t2;

P1 = u * (if + ia );

Yita = P2./P1;

 

% Plot the IA-N Working Characteristic Curve

Figure

NY = polyfit (IA, N, 3)

IX = 0: 0. 01:1. 2;

NF = polyval (NY, IX );

Plot (IA, N, '*', IX, NF)

Axis ([0 1.2 0 2000])

Title ('ia-N Working Characteristic Curve ')

 

% Draw Ia-T2 Working Characteristic Curve

Figure

Ty = polyfit (IA, T2, 3)

IX = 0: 0. 01:1. 2;

TF = polyval (TY, IX );

Plot (IA, T2, '*', IX, TF)

Axis ([0 1.2 0 1.2])

Title ('ia-t2 Working Characteristic Curve ')

 

% Plot the Working Characteristic Curve of IA-yita

Figure

YY = polyfit (IA, yita, 3)

IX = 0: 0. 01:1. 2;

YF = polyval (YY, IX );

Plot (IA, yita, '*', IX, YF)

Axis ([0 1.2 0 1])

Title ('ia-efficiency work characteristic curve ')

 

% Drawing T2-n Mechanical Characteristic Curve

Figure

NY = polyfit (t2, N, 3)

Tx = 0: 0. 01:1. 2;

NF = polyval (NY, TX );

Plot (t2, N, '*', TX, NF)

Axis ([0 1.2 0 1900])

Title ('t2-N Mechanical Characteristic Curve ')

 

 

P1 = [276.76 254.76 232.76 221.76 210.76 199.76 190.96 177.76 166.76 155.76 144.76 133.76 129.36 76.56]

P2 = [181.44 171.57 153.0144 145.1919 136.9368 130.536 124.068 114.24 106.0584 97.6374 89.47155 78.9222 77.3955 34.4736]

ETA = [0.6556 0.6735 0.6574 0.6547 0.6497 0.6535 0.6497 0.6427 0.6360 0.6268 0.6181 0.5900 0.5983 0.4503]

2. Speed Control Features

In the case of persistence and, measured at this time.

Then keep the constant, that is, the constant torque, adjust the load and the armature power supply, and measure.

UA = [220 216 208 196 179 167 158 143 116];

IA = [0.6 0.6 0.59 0.6 0.59 0.58 0.58 0.58 0.56];

N = [1753 1712 1751 1554 1410 1315 1236 1116 895];

 

% Draw UA-N speed control Characteristic Curve

Figure

NY = polyfit (UA, N, 3)

UX = 100:220;

NF = polyval (NY, UX );

Plot (UA, N, '*', UX, NF)

Axis ([100 220 0 2000])

Title ('ua-N Speed Regulating Characteristic Curve ')

 

In the case of persistence, it is measured at this time. Then keep the constant, that is, the constant torque, adjust the load and the armature power supply, and measure.

If = [95 87 79 71 64 58 56 54 44];

IA = [0.6 0.62 0.63 0.66 0.68 0.71 0.71 0.73 0.84];

N = [1465 1494 1535 1578 1633 1686 1705 1732 1920];

 

% Draw if-N speed control Characteristic Curve

Figure

NY = polyfit (if, N, 3)

IX = 0: 100;

NF = polyval (NY, IX );

Plot (if, N, '*', IX, NF)

Axis ([0 100 0 2000])

Title ('If-N Speed Regulating Characteristic Curve ')