1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
|
{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 1:Fundamentals of Electric Drives"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example no:1.1,Page no:10"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
" \n",
"import math \n",
"\n",
"\n",
"#Variable declaration\n",
"J=12 #journey per hour\n",
"Load=5500 #[Load] Kg\n",
"t_up=1.5 #[time] min\n",
"W_cage=500 #[Weight of cage] Kg\n",
"t_down=1.25 #[time] min\n",
"h=50 #[height] m\n",
"Wb=3000 #Kg(Balance weight)\n",
"Eff_hoist=0.8 #Effeciency of hoist \n",
"Eff_motor=0.85 #Efficiency of motor\n",
"g=9.81 #gravity constant\n",
"\n",
"#Calculation\n",
"E_upward=(Load+W_cage-Wb)*g*h #J\n",
"E_downward=(Wb-W_cage)*g*h #J\n",
"Edj=E_upward+E_downward #J(Energy used in double journey)\n",
"Ein=Edj/Eff_hoist/Eff_motor #J or W-s\n",
"Ein=Ein/1000/3600 #KWh\n",
"Ein_hour=Ein*J #KWh\n",
"\n",
"Rating=E_upward/Eff_hoist/t_up/60 #W\n",
"\n",
"#Result\n",
"print\"\\n\\n(a).Electrical energy used in upward journey :\",E_upward,\"J\"\n",
"print\" Electrical energy used in downward journey :\",E_downward,\"J\"\n",
"print\" Electrical energy used in each double journey :\",Edj,\"J\"\n",
"print\" Energy input in each double journey=\",round(Ein,3),\"kWh\\n\"\n",
"print\"(b).Electrical energy consumption in one hour : \",round(Ein_hour,3),\"kWh\\n\"\n",
"print\"(c) kW Rating of motor: \",Rating/1000,\"kW\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"\n",
"(a).Electrical energy used in upward journey : 1471500.0 J\n",
" Electrical energy used in downward journey : 1226250.0 J\n",
" Electrical energy used in each double journey : 2697750.0 J\n",
" Energy input in each double journey= 1.102 kWh\n",
"\n",
"(b).Electrical energy consumption in one hour : 13.224 kWh\n",
"\n",
"(c) kW Rating of motor: 20.4375 kW\n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}
|
