Pm = kW / hmotor
Hydraulic: ≤4 stories, no counterweight, 58% mechanical efficiency
Traction: >4 stories, counterweight (car + 40% load), 64% mechanical efficiency
The Elevator Motor Power Calculator V1.0 calculates peak motor power for elevators per ASHRAE 90.1 Appendix G. It's for energy compliance modeling, not actual elevator engineering. The calculator handles single elevators, multiple elevator banks, and baseline-versus-proposed comparisons for compliance documentation.
Motor efficiency values for traction elevators based on shaft input power.
| Shaft Input Power (kW) | Full-Load Motor Efficiency (%) |
|---|---|
| 0.8 | 82.5 |
| 1.1 | 84.0 |
| 1.5 | 84.0 |
| 2.2 | 87.5 |
| 3.7 | 87.5 |
| 5.6 | 89.5 |
| 7.5 | 89.5 |
| 11.1 | 91.0 |
| 14.9 | 91.0 |
| 18.7 | 92.4 |
| 22.4 | 92.4 |
| 29.8 | 93.0 |
| 37.3 | 93.0 |
| 44.8 | 93.6 |
| 56.0 | 94.1 |
| 74.6 | 94.5 |
| 93.3 | 94.5 |
| 111.9 | 95.0 |
| 149.2 | 95.0 |
The calculator uses the efficiency for the next motor size greater than the calculated input kW.
Baseline parameters based on building height.
| Number of Stories (Including Basement) |
Motor Type | Counterweight | Mechanical Efficiency |
Motor Efficiency |
|---|---|---|---|---|
| 4 | Hydraulic | None | 58% | Table G3.9.3 |
| >4 | Traction | Proposed design counterweight, if not specified use weight of the car plus 40% of the rated load | 64% | Table G3.9.1 |
Motor efficiency values for hydraulic elevators based on shaft input power.
| Shaft Input Power (kW) | Full-Load Motor Efficiency (%) |
|---|---|
| 7.5 | 72 |
| 15 | 75 |
| 22 | 78 |
| 30 | 78 |
| 75 | 80 |
The calculator uses the efficiency for the next motor size greater than the calculated input kW.
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