C-3. Design for applications with different overloads
You are chief engineer at a plant. Design drive system for the five conveyors. Design for the following overload variants:
- (a) No overloads (0%),
- (b) 100% 2 sec each 1 min,
- (c) 100% 1 min each 10 min,
- (d) 100% 2 min each 20 min.
- (e) 50% 1 min each 10 min.
Available information:
- One drum to be driven
- Rated torque 10 kNm
- Speeds: min – 400 rpm, max - 630 rpm
- Duty 100%
- Air-conditioned clear power house, abundant heat removal capability
- Grid 400 V
- Distance pump from FC (cable length) – 40 m
- Cooling water not available
Explain the results.
| Case | Overload | Motor type | FC type | Cost motor | Cost FC | Cost total |
|---|---|---|---|---|---|---|
| 1 | No | |||||
| 2 | 100% 2 sec each 1 min | |||||
| 3 | 100% 1 min each 10 min | |||||
| 4 | 100% 5 min each 20 min | |||||
| 5 | 50% 1 min each 10 min |