| Comparation details | Rotary Frequency Converter | Static Frequency Converter |
| generatation | Old generataion. Widly used in 1980s | new generataion. |
| effciency | motor drive generator ,so effciency is 60~70% | 93% |
| Minotor ability | No | Remote mornitor,save manpower |
| Safety to load equipment | Designed specifically for the drive frequency in the motor start, when it starts the voltage synchronization up from 0~440Vac ,and frequency synchronization up from 0~60Hz .electrical equipment may be affected, especially the transformer, rectifier control, communications design equipment, etc. | The process of start can directly output constant 60hz frequency. SFC can provide clean and reliable, low harmonic distortion, high stability frequency sine wave voltage and power output, very close to the ideal AC power. |
| Input frequency | fixed | 25~70Hz |
| Output frequency stability | Unstabiity ,depend on the wave of the power grid,it is fixed | AC power to DC power to AC power. ≤±0.01% and adjustale |
| Output voltage stability | Unstabiity,depend on the wave of the power grid | AC power to DC power to AC power. ≤1% |
| noisy | Very loud | Less than 65dBA @ 1 meter |
| Overload ability | no | 110% 1hour 125% 10minutes 150% 30 seconds 200% 1second |
| cooling | Forced ventilation | Forced ventilation and heat tube |
| Impact ability | better | best |
| mantance | difficult | easy |
| Max.single engine | | 1000Kva |
| Working temperature | 0℃~+55℃ | 10℃~+50℃ |
| Power factor (PF) | 0.75 load | 95% at 100% load |
| Voltage Drop Compensation with long distance | no | yes |
