| Title |
A Study on the Operation of Residual Voltage in the Power Off of Three-Phase Induction Motor |
| DOI |
http://doi.org/10.5207/JIEIE.2020.34.5.059 |
| Keywords |
Bus transfer; Induction Motor; Inertia moment; Kinetic energy; Residual voltage |
| Abstract |
The voltage does not immediately become zero even if the running induction motor is stopped. In this state, if the motor is directly connected as an alternative power source, a large stress may be applied to the shaft by the high starting current. Therefore, when the main power supply is cut off, several methods have been proposed to reduce the stress on the motor when switching to the alternative power supply. The most common method specified in international standards is to switch the power supply when the residual voltage of the motor reaches a certain value. There are two methods to obtain the magnitude of the residual voltage when the motor is stopped, using an equivalent circuit diagram or using parameters suggested by the manufacturer.
In this study, the two methods were compared and analyzed, the parameters required at the time of power supply switching were calculated, the method of searching for a reasonably stable residual voltage value, and the allowable range of the cycle required at the time of alternative power supply switching were presented. |