Download high quality low-loss low-cost dc motor torque controller

HIGH QUALITY LOW-LOSS
LOW-COST DC MOTOR
TORQUE CONTROLLER
JOSE PEDRO GARCERAN SANCHEZ
BYEONG CHAN PARK
NUMBER 48
OBJECTIVE
BUILD AND DESIGN A VERY EFFICIENT CONVERTER (90% EFFICIENCY)
WITH THE LOWEST COST POSSIBLE.
IMPLEMENT SAFETY FEATURES IN THE CONTROLLER SO IT KEEPS THE
USER SAFE AND COMFORTABLE WHILE USING.
ESTIMATING LOSSES
𝑃𝑙𝑜𝑠𝑠
𝐷𝑜𝑛 ∗ 𝑇𝑠𝑤𝑖𝑡𝑐ℎ ∗ 𝑉𝑟𝑒𝑠𝑖𝑑 ∗ 𝐼𝑜𝑛 + 𝐷𝑜𝑓𝑓 ∗ 𝑇_𝑠𝑤𝑖𝑡𝑐ℎ ∗ 𝑉𝑜𝑓𝑓 ∗ 𝐼𝑟𝑒𝑠𝑖𝑑 + 𝑊𝑠𝑤𝑖𝑡𝑐ℎ
=
𝑇𝑠𝑤𝑖𝑡𝑐ℎ
𝑊𝑠𝑤𝑖𝑡𝑐ℎ =
𝑉𝑜𝑓𝑓 ∗ 𝐼𝑜𝑛 ∗ (𝑡𝑡𝑢𝑟𝑛𝑜𝑛 + 𝑡𝑡𝑢𝑟𝑛𝑜𝑓𝑓 )
2
𝑇𝑠𝑤𝑖𝑡𝑐ℎ =
1
𝑓𝑠𝑤𝑖𝑡𝑐ℎ
=
1
20 ∗ 103
Voff= 12 V, Vresid= 0.1 V, Ion=15 A, Ioff= 0.03 A, Don= Doff= 0.5
Ploss= 5 W
(rough estimation, notexact, no interest in exactvalue)
SIMULATION
Result for Programable Micro Controler
120
100
80
60
40
20
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1. Smooth acceleration is achieved.
2. With current sensing resistor, stops at current limit(50.5 A)
3. If the current reaches at 49A, It starts counting for 5seconds, then
stops sending signal to the gate of MOSFET.
PICTURE
BLOCK DIAGRAM
CONCLUSION
1. EVEN THE SIMPLEST CIRCUITS CAN HAVE COMPLEXITIES WHEN
PRACTICAL IMPLEMENTATION.
2. CHECK EVERY COMPONENT BEFORE USING IT IN A CIRCUIT.
3. THEORY AND PRACTICE DONT HAVE TO MATCH 100%.
4. EXACT MATHEMATICAL VALUES ARE NOT NEEDED MOST OF THE
TIMES, JUST GOOD ESTIMATIONS.